lisp/gnus/mml2015.el

   1 ;;; mml2015.el --- MIME Security with Pretty Good Privacy (PGP)
   2
   3 ;; Copyright (C) 2000-2011 Free Software Foundation, Inc.
   4
   5 ;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
   6 ;; Keywords: PGP MIME MML
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; RFC 2015 is updated by RFC 3156, this file should be compatible
  26 ;; with both.
  27
  28 ;;; Code:
  29
  30 (eval-and-compile
  31   ;; For Emacs <22.2 and XEmacs.
  32   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r)))
  33
  34   (if (locate-library "password-cache")
  35       (require 'password-cache)
  36     (require 'password)))
  37
  38 (eval-when-compile (require 'cl))
  39 (require 'mm-decode)
  40 (require 'mm-util)
  41 (require 'mml)
  42 (require 'mml-sec)
  43
  44 (defvar mc-pgp-always-sign)
  45
  46 (declare-function epg-check-configuration "ext:epg-config"
  47                   (config &optional minimum-version))
  48 (declare-function epg-configuration "ext:epg-config" ())
  49
  50 (defvar mml2015-use (or
  51                      (condition-case nil
  52                          (progn
  53                            (require 'epg-config)
  54                            (epg-check-configuration (epg-configuration))
  55                            'epg)
  56                        (error))
  57                      (progn
  58                        (ignore-errors (require 'pgg))
  59                        (and (fboundp 'pgg-sign-region)
  60                             'pgg))
  61                      (progn (ignore-errors
  62                               (load "mc-toplev"))
  63                             (and (fboundp 'mc-encrypt-generic)
  64                                  (fboundp 'mc-sign-generic)
  65                                  (fboundp 'mc-cleanup-recipient-headers)
  66                                  'mailcrypt)))
  67   "The package used for PGP/MIME.
  68 Valid packages include `epg', `pgg' and `mailcrypt'.")
  69
  70 ;; Something is not RFC2015.
  71 (defvar mml2015-function-alist
  72   '((mailcrypt mml2015-mailcrypt-sign
  73                mml2015-mailcrypt-encrypt
  74                mml2015-mailcrypt-verify
  75                mml2015-mailcrypt-decrypt
  76                mml2015-mailcrypt-clear-verify
  77                mml2015-mailcrypt-clear-decrypt)
  78     (pgg mml2015-pgg-sign
  79          mml2015-pgg-encrypt
  80          mml2015-pgg-verify
  81          mml2015-pgg-decrypt
  82          mml2015-pgg-clear-verify
  83          mml2015-pgg-clear-decrypt)
  84     (epg mml2015-epg-sign
  85          mml2015-epg-encrypt
  86          mml2015-epg-verify
  87          mml2015-epg-decrypt
  88          mml2015-epg-clear-verify
  89          mml2015-epg-clear-decrypt))
  90   "Alist of PGP/MIME functions.")
  91
  92 (defvar mml2015-result-buffer nil)
  93
  94 (defcustom mml2015-unabbrev-trust-alist
  95   '(("TRUST_UNDEFINED" . nil)
  96     ("TRUST_NEVER"     . nil)
  97     ("TRUST_MARGINAL"  . t)
  98     ("TRUST_FULLY"     . t)
  99     ("TRUST_ULTIMATE"  . t))
 100   "Map GnuPG trust output values to a boolean saying if you trust the key."
 101   :version "22.1"
 102   :group 'mime-security
 103   :type '(repeat (cons (regexp :tag "GnuPG output regexp")
 104                        (boolean :tag "Trust key"))))
 105
 106 (defcustom mml2015-cache-passphrase mml-secure-cache-passphrase
 107   "If t, cache passphrase."
 108   :group 'mime-security
 109   :type 'boolean)
 110
 111 (defcustom mml2015-passphrase-cache-expiry mml-secure-passphrase-cache-expiry
 112   "How many seconds the passphrase is cached.
 113 Whether the passphrase is cached at all is controlled by
 114 `mml2015-cache-passphrase'."
 115   :group 'mime-security
 116   :type 'integer)
 117
 118 (defcustom mml2015-signers nil
 119   "A list of your own key ID(s) which will be used to sign a message.
 120 If set, it overrides the setting of `mml2015-sign-with-sender'."
 121   :group 'mime-security
 122   :type '(repeat (string :tag "Key ID")))
 123
 124 (defcustom mml2015-sign-with-sender nil
 125   "If t, use message sender so find a key to sign with."
 126   :group 'mime-security
 127   :type 'boolean
 128   :version "24.1")
 129
 130 (defcustom mml2015-encrypt-to-self nil
 131   "If t, add your own key ID to recipient list when encryption."
 132   :group 'mime-security
 133   :type 'boolean)
 134
 135 (defcustom mml2015-always-trust t
 136   "If t, GnuPG skip key validation on encryption."
 137   :group 'mime-security
 138   :type 'boolean)
 139
 140 ;; Extract plaintext from cleartext signature.  IMO, this kind of task
 141 ;; should be done by GnuPG rather than Elisp, but older PGP backends
 142 ;; (such as Mailcrypt, and PGG) discard the output from GnuPG.
 143 (defun mml2015-extract-cleartext-signature ()
 144   ;; Daiki Ueno in
 145   ;; <54a15d860801080142l70b95d7dkac4bf51a86196011@mail.gmail.com>: ``I still
 146   ;; believe that the right way is to use the plaintext output from GnuPG as
 147   ;; it is, and mml2015-extract-cleartext-signature is just a kludge for
 148   ;; misdesigned libraries like PGG, which have no ability to do that.  So, I
 149   ;; think it should not have descriptive documentation.''
 150   ;;
 151   ;; This function doesn't handle NotDashEscaped correctly.  EasyPG handles it
 152   ;; correctly.
 153   ;; http://thread.gmane.org/gmane.emacs.gnus.general/66062/focus=66082
 154   ;; http://thread.gmane.org/gmane.emacs.gnus.general/65087/focus=65109
 155   (goto-char (point-min))
 156   (forward-line)
 157   ;; We need to be careful not to strip beyond the armor headers.
 158   ;; Previously, an attacker could replace the text inside our
 159   ;; markup with trailing garbage by injecting whitespace into the
 160   ;; message.
 161   (while (looking-at "Hash:")           ; The only header allowed in cleartext
 162     (forward-line))                     ; signatures according to RFC2440.
 163   (when (looking-at "[\t ]*$")
 164     (forward-line))
 165   (delete-region (point-min) (point))
 166   (if (re-search-forward "^-----BEGIN PGP SIGNATURE-----" nil t)
 167       (delete-region (match-beginning 0) (point-max)))
 168   (goto-char (point-min))
 169   (while (re-search-forward "^- " nil t)
 170     (replace-match "" t t)
 171     (forward-line 1)))
 172
 173 ;;; mailcrypt wrapper
 174
 175 (autoload 'mailcrypt-decrypt "mailcrypt")
 176 (autoload 'mailcrypt-verify "mailcrypt")
 177 (autoload 'mc-pgp-always-sign "mailcrypt")
 178 (autoload 'mc-encrypt-generic "mc-toplev")
 179 (autoload 'mc-cleanup-recipient-headers "mc-toplev")
 180 (autoload 'mc-sign-generic "mc-toplev")
 181
 182 (defvar mml2015-decrypt-function 'mailcrypt-decrypt)
 183 (defvar mml2015-verify-function 'mailcrypt-verify)
 184
 185 (defun mml2015-format-error (err)
 186   (if (stringp (cadr err))
 187       (cadr err)
 188     (format "%S" (cdr err))))
 189
 190 (defun mml2015-mailcrypt-decrypt (handle ctl)
 191   (catch 'error
 192     (let (child handles result)
 193       (unless (setq child (mm-find-part-by-type
 194                            (cdr handle)
 195                            "application/octet-stream" nil t))
 196         (mm-set-handle-multipart-parameter
 197          mm-security-handle 'gnus-info "Corrupted")
 198         (throw 'error handle))
 199       (with-temp-buffer
 200         (mm-insert-part child)
 201         (setq result
 202               (condition-case err
 203                   (funcall mml2015-decrypt-function)
 204                 (error
 205                  (mm-set-handle-multipart-parameter
 206                   mm-security-handle 'gnus-details (mml2015-format-error err))
 207                  nil)
 208                 (quit
 209                  (mm-set-handle-multipart-parameter
 210                   mm-security-handle 'gnus-details "Quit.")
 211                  nil)))
 212         (unless (car result)
 213           (mm-set-handle-multipart-parameter
 214            mm-security-handle 'gnus-info "Failed")
 215           (throw 'error handle))
 216         (setq handles (mm-dissect-buffer t)))
 217       (mm-destroy-parts handle)
 218       (mm-set-handle-multipart-parameter
 219        mm-security-handle 'gnus-info
 220        (concat "OK"
 221                (let ((sig (with-current-buffer mml2015-result-buffer
 222                             (mml2015-gpg-extract-signature-details))))
 223                  (concat ", Signer: " sig))))
 224       (if (listp (car handles))
 225           handles
 226         (list handles)))))
 227
 228 (defun mml2015-gpg-pretty-print-fpr (fingerprint)
 229   (let* ((result "")
 230          (fpr-length (string-width fingerprint))
 231          (n-slice 0)
 232          slice)
 233     (setq fingerprint (string-to-list fingerprint))
 234     (while fingerprint
 235       (setq fpr-length (- fpr-length 4))
 236       (setq slice (butlast fingerprint fpr-length))
 237       (setq fingerprint (nthcdr 4 fingerprint))
 238       (setq n-slice (1+ n-slice))
 239       (setq result
 240             (concat
 241              result
 242              (case n-slice
 243                (1  slice)
 244                (otherwise (concat " " slice))))))
 245     result))
 246
 247 (defun mml2015-gpg-extract-signature-details ()
 248   (goto-char (point-min))
 249   (let* ((expired (re-search-forward
 250                    "^\\[GNUPG:\\] SIGEXPIRED$"
 251                    nil t))
 252          (signer (and (re-search-forward
 253                        "^\\[GNUPG:\\] GOODSIG \\([0-9A-Za-z]*\\) \\(.*\\)$"
 254                        nil t)
 255                       (cons (match-string 1) (match-string 2))))
 256          (fprint (and (re-search-forward
 257                        "^\\[GNUPG:\\] VALIDSIG \\([0-9a-zA-Z]*\\) "
 258                        nil t)
 259                       (match-string 1)))
 260          (trust  (and (re-search-forward
 261                        "^\\[GNUPG:\\] \\(TRUST_.*\\)$"
 262                        nil t)
 263                       (match-string 1)))
 264          (trust-good-enough-p
 265           (cdr (assoc trust mml2015-unabbrev-trust-alist))))
 266     (cond ((and signer fprint)
 267            (concat (cdr signer)
 268                    (unless trust-good-enough-p
 269                      (concat "\nUntrusted, Fingerprint: "
 270                              (mml2015-gpg-pretty-print-fpr fprint)))
 271                    (when expired
 272                      (format "\nWARNING: Signature from expired key (%s)"
 273                              (car signer)))))
 274           ((re-search-forward
 275             "^\\(gpg: \\)?Good signature from \"\\(.*\\)\"$" nil t)
 276            (match-string 2))
 277           (t
 278            "From unknown user"))))
 279
 280 (defun mml2015-mailcrypt-clear-decrypt ()
 281   (let (result)
 282     (setq result
 283           (condition-case err
 284               (funcall mml2015-decrypt-function)
 285             (error
 286              (mm-set-handle-multipart-parameter
 287               mm-security-handle 'gnus-details (mml2015-format-error err))
 288              nil)
 289             (quit
 290              (mm-set-handle-multipart-parameter
 291               mm-security-handle 'gnus-details "Quit.")
 292              nil)))
 293     (if (car result)
 294         (mm-set-handle-multipart-parameter
 295          mm-security-handle 'gnus-info "OK")
 296       (mm-set-handle-multipart-parameter
 297        mm-security-handle 'gnus-info "Failed"))))
 298
 299 (defun mml2015-fix-micalg (alg)
 300   (and alg
 301        ;; Mutt/1.2.5i has seen sending micalg=php-sha1
 302        (upcase (if (string-match "^p[gh]p-" alg)
 303                    (substring alg (match-end 0))
 304                  alg))))
 305
 306 (defun mml2015-mailcrypt-verify (handle ctl)
 307   (catch 'error
 308     (let (part)
 309       (unless (setq part (mm-find-raw-part-by-type
 310                           ctl (or (mm-handle-multipart-ctl-parameter
 311                                    ctl 'protocol)
 312                                   "application/pgp-signature")
 313                           t))
 314         (mm-set-handle-multipart-parameter
 315          mm-security-handle 'gnus-info "Corrupted")
 316         (throw 'error handle))
 317       (with-temp-buffer
 318         (insert "-----BEGIN PGP SIGNED MESSAGE-----\n")
 319         (insert (format "Hash: %s\n\n"
 320                         (or (mml2015-fix-micalg
 321                              (mm-handle-multipart-ctl-parameter
 322                               ctl 'micalg))
 323                             "SHA1")))
 324         (save-restriction
 325           (narrow-to-region (point) (point))
 326           (insert part "\n")
 327           (goto-char (point-min))
 328           (while (not (eobp))
 329             (if (looking-at "^-")
 330                 (insert "- "))
 331             (forward-line)))
 332         (unless (setq part (mm-find-part-by-type
 333                             (cdr handle) "application/pgp-signature" nil t))
 334           (mm-set-handle-multipart-parameter
 335            mm-security-handle 'gnus-info "Corrupted")
 336           (throw 'error handle))
 337         (save-restriction
 338           (narrow-to-region (point) (point))
 339           (mm-insert-part part)
 340           (goto-char (point-min))
 341           (if (re-search-forward "^-----BEGIN PGP [^-]+-----\r?$" nil t)
 342               (replace-match "-----BEGIN PGP SIGNATURE-----" t t))
 343           (if (re-search-forward "^-----END PGP [^-]+-----\r?$" nil t)
 344               (replace-match "-----END PGP SIGNATURE-----" t t)))
 345         (let ((mc-gpg-debug-buffer (get-buffer-create " *gnus gpg debug*")))
 346           (unless (condition-case err
 347                       (prog1
 348                           (funcall mml2015-verify-function)
 349                         (if (get-buffer " *mailcrypt stderr temp")
 350                             (mm-set-handle-multipart-parameter
 351                              mm-security-handle 'gnus-details
 352                              (with-current-buffer " *mailcrypt stderr temp"
 353                                (buffer-string))))
 354                         (if (get-buffer " *mailcrypt stdout temp")
 355                             (kill-buffer " *mailcrypt stdout temp"))
 356                         (if (get-buffer " *mailcrypt stderr temp")
 357                             (kill-buffer " *mailcrypt stderr temp"))
 358                         (if (get-buffer " *mailcrypt status temp")
 359                             (kill-buffer " *mailcrypt status temp"))
 360                         (if (get-buffer mc-gpg-debug-buffer)
 361                             (kill-buffer mc-gpg-debug-buffer)))
 362                     (error
 363                      (mm-set-handle-multipart-parameter
 364                       mm-security-handle 'gnus-details (mml2015-format-error err))
 365                      nil)
 366                     (quit
 367                      (mm-set-handle-multipart-parameter
 368                       mm-security-handle 'gnus-details "Quit.")
 369                      nil))
 370             (mm-set-handle-multipart-parameter
 371              mm-security-handle 'gnus-info "Failed")
 372             (throw 'error handle))))
 373       (mm-set-handle-multipart-parameter
 374        mm-security-handle 'gnus-info "OK")
 375       handle)))
 376
 377 (defun mml2015-mailcrypt-clear-verify ()
 378   (let ((mc-gpg-debug-buffer (get-buffer-create " *gnus gpg debug*")))
 379     (if (condition-case err
 380             (prog1
 381                 (funcall mml2015-verify-function)
 382               (if (get-buffer " *mailcrypt stderr temp")
 383                   (mm-set-handle-multipart-parameter
 384                    mm-security-handle 'gnus-details
 385                    (with-current-buffer " *mailcrypt stderr temp"
 386                      (buffer-string))))
 387               (if (get-buffer " *mailcrypt stdout temp")
 388                   (kill-buffer " *mailcrypt stdout temp"))
 389               (if (get-buffer " *mailcrypt stderr temp")
 390                   (kill-buffer " *mailcrypt stderr temp"))
 391               (if (get-buffer " *mailcrypt status temp")
 392                   (kill-buffer " *mailcrypt status temp"))
 393               (if (get-buffer mc-gpg-debug-buffer)
 394                   (kill-buffer mc-gpg-debug-buffer)))
 395           (error
 396            (mm-set-handle-multipart-parameter
 397             mm-security-handle 'gnus-details (mml2015-format-error err))
 398            nil)
 399           (quit
 400            (mm-set-handle-multipart-parameter
 401             mm-security-handle 'gnus-details "Quit.")
 402            nil))
 403         (mm-set-handle-multipart-parameter
 404          mm-security-handle 'gnus-info "OK")
 405       (mm-set-handle-multipart-parameter
 406        mm-security-handle 'gnus-info "Failed")))
 407   (mml2015-extract-cleartext-signature))
 408
 409 (defun mml2015-mailcrypt-sign (cont)
 410   (mc-sign-generic (message-options-get 'message-sender)
 411                    nil nil nil nil)
 412   (let ((boundary (mml-compute-boundary cont))
 413         hash point)
 414     (goto-char (point-min))
 415     (unless (re-search-forward "^-----BEGIN PGP SIGNED MESSAGE-----\r?$" nil t)
 416       (error "Cannot find signed begin line"))
 417     (goto-char (match-beginning 0))
 418     (forward-line 1)
 419     (unless (looking-at "Hash:[ \t]*\\([a-zA-Z0-9]+\\)")
 420       (error "Cannot not find PGP hash"))
 421     (setq hash (match-string 1))
 422     (unless (re-search-forward "^$" nil t)
 423       (error "Cannot not find PGP message"))
 424     (forward-line 1)
 425     (delete-region (point-min) (point))
 426     (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
 427                     boundary))
 428     (insert (format "\tmicalg=pgp-%s; protocol=\"application/pgp-signature\"\n"
 429                     (downcase hash)))
 430     (insert (format "\n--%s\n" boundary))
 431     (setq point (point))
 432     (goto-char (point-max))
 433     (unless (re-search-backward "^-----END PGP SIGNATURE-----\r?$" nil t)
 434       (error "Cannot find signature part"))
 435     (replace-match "-----END PGP MESSAGE-----" t t)
 436     (goto-char (match-beginning 0))
 437     (unless (re-search-backward "^-----BEGIN PGP SIGNATURE-----\r?$"
 438                                 nil t)
 439       (error "Cannot find signature part"))
 440     (replace-match "-----BEGIN PGP MESSAGE-----" t t)
 441     (goto-char (match-beginning 0))
 442     (save-restriction
 443       (narrow-to-region point (point))
 444       (goto-char point)
 445       (while (re-search-forward "^- -" nil t)
 446         (replace-match "-" t t))
 447       (goto-char (point-max)))
 448     (insert (format "--%s\n" boundary))
 449     (insert "Content-Type: application/pgp-signature\n\n")
 450     (goto-char (point-max))
 451     (insert (format "--%s--\n" boundary))
 452     (goto-char (point-max))))
 453
 454 ;; We require mm-decode, which requires mm-bodies, which autoloads
 455 ;; message-options-get (!).
 456 (declare-function message-options-set "message" (symbol value))
 457
 458 (defun mml2015-mailcrypt-encrypt (cont &optional sign)
 459   (let ((mc-pgp-always-sign
 460          (or mc-pgp-always-sign
 461              sign
 462              (eq t (or (message-options-get 'message-sign-encrypt)
 463                        (message-options-set
 464                         'message-sign-encrypt
 465                         (or (y-or-n-p "Sign the message? ")
 466                             'not))))
 467              'never)))
 468     (mm-with-unibyte-current-buffer
 469       (mc-encrypt-generic
 470        (or (message-options-get 'message-recipients)
 471            (message-options-set 'message-recipients
 472                               (mc-cleanup-recipient-headers
 473                                (read-string "Recipients: "))))
 474        nil nil nil
 475        (message-options-get 'message-sender))))
 476   (goto-char (point-min))
 477   (unless (looking-at "-----BEGIN PGP MESSAGE-----")
 478     (error "Fail to encrypt the message"))
 479   (let ((boundary (mml-compute-boundary cont)))
 480     (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
 481                     boundary))
 482     (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
 483     (insert (format "--%s\n" boundary))
 484     (insert "Content-Type: application/pgp-encrypted\n\n")
 485     (insert "Version: 1\n\n")
 486     (insert (format "--%s\n" boundary))
 487     (insert "Content-Type: application/octet-stream\n\n")
 488     (goto-char (point-max))
 489     (insert (format "--%s--\n" boundary))
 490     (goto-char (point-max))))
 491
 492 ;;; pgg wrapper
 493
 494 (defvar pgg-default-user-id)
 495 (defvar pgg-errors-buffer)
 496 (defvar pgg-output-buffer)
 497
 498 (autoload 'pgg-decrypt-region "pgg")
 499 (autoload 'pgg-verify-region "pgg")
 500 (autoload 'pgg-sign-region "pgg")
 501 (autoload 'pgg-encrypt-region "pgg")
 502 (autoload 'pgg-parse-armor "pgg-parse")
 503
 504 (defun mml2015-pgg-decrypt (handle ctl)
 505   (catch 'error
 506     (let ((pgg-errors-buffer mml2015-result-buffer)
 507           child handles result decrypt-status)
 508       (unless (setq child (mm-find-part-by-type
 509                            (cdr handle)
 510                            "application/octet-stream" nil t))
 511         (mm-set-handle-multipart-parameter
 512          mm-security-handle 'gnus-info "Corrupted")
 513         (throw 'error handle))
 514       (with-temp-buffer
 515         (mm-insert-part child)
 516         (if (condition-case err
 517                 (prog1
 518                     (pgg-decrypt-region (point-min) (point-max))
 519                   (setq decrypt-status
 520                         (with-current-buffer mml2015-result-buffer
 521                           (buffer-string)))
 522                   (mm-set-handle-multipart-parameter
 523                    mm-security-handle 'gnus-details
 524                    decrypt-status))
 525               (error
 526                (mm-set-handle-multipart-parameter
 527                 mm-security-handle 'gnus-details (mml2015-format-error err))
 528                nil)
 529               (quit
 530                (mm-set-handle-multipart-parameter
 531                 mm-security-handle 'gnus-details "Quit.")
 532                nil))
 533             (with-current-buffer pgg-output-buffer
 534               (goto-char (point-min))
 535               (while (search-forward "\r\n" nil t)
 536                 (replace-match "\n" t t))
 537               (setq handles (mm-dissect-buffer t))
 538               (mm-destroy-parts handle)
 539               (mm-set-handle-multipart-parameter
 540                mm-security-handle 'gnus-info "OK")
 541               (mm-set-handle-multipart-parameter
 542                mm-security-handle 'gnus-details
 543                (concat decrypt-status
 544                        (when (stringp (car handles))
 545                          "\n" (mm-handle-multipart-ctl-parameter
 546                                handles 'gnus-details))))
 547               (if (listp (car handles))
 548                   handles
 549                 (list handles)))
 550           (mm-set-handle-multipart-parameter
 551            mm-security-handle 'gnus-info "Failed")
 552           (throw 'error handle))))))
 553
 554 (defun mml2015-pgg-clear-decrypt ()
 555   (let ((pgg-errors-buffer mml2015-result-buffer))
 556     (if (prog1
 557             (pgg-decrypt-region (point-min) (point-max))
 558           (mm-set-handle-multipart-parameter
 559            mm-security-handle 'gnus-details
 560            (with-current-buffer mml2015-result-buffer
 561              (buffer-string))))
 562         (progn
 563           (erase-buffer)
 564           ;; Treat data which pgg returns as a unibyte string.
 565           (mm-disable-multibyte)
 566           (insert-buffer-substring pgg-output-buffer)
 567           (goto-char (point-min))
 568           (while (search-forward "\r\n" nil t)
 569             (replace-match "\n" t t))
 570           (mm-set-handle-multipart-parameter
 571            mm-security-handle 'gnus-info "OK"))
 572       (mm-set-handle-multipart-parameter
 573        mm-security-handle 'gnus-info "Failed"))))
 574
 575 (defun mml2015-pgg-verify (handle ctl)
 576   (let ((pgg-errors-buffer mml2015-result-buffer)
 577         signature-file part signature)
 578     (if (or (null (setq part (mm-find-raw-part-by-type
 579                               ctl (or (mm-handle-multipart-ctl-parameter
 580                                        ctl 'protocol)
 581                                       "application/pgp-signature")
 582                               t)))
 583             (null (setq signature (mm-find-part-by-type
 584                                    (cdr handle) "application/pgp-signature" nil t))))
 585         (progn
 586           (mm-set-handle-multipart-parameter
 587            mm-security-handle 'gnus-info "Corrupted")
 588           handle)
 589       (with-temp-buffer
 590         (insert part)
 591         ;; Convert <LF> to <CR><LF> in signed text.  If --textmode is
 592         ;; specified when signing, the conversion is not necessary.
 593         (goto-char (point-min))
 594         (end-of-line)
 595         (while (not (eobp))
 596           (unless (eq (char-before) ?\r)
 597             (insert "\r"))
 598           (forward-line)
 599           (end-of-line))
 600         (with-temp-file (setq signature-file (mm-make-temp-file "pgg"))
 601           (mm-insert-part signature))
 602         (if (condition-case err
 603                 (prog1
 604                     (pgg-verify-region (point-min) (point-max)
 605                                        signature-file t)
 606                   (goto-char (point-min))
 607                   (while (search-forward "\r\n" nil t)
 608                     (replace-match "\n" t t))
 609                   (mm-set-handle-multipart-parameter
 610                    mm-security-handle 'gnus-details
 611                    (concat (with-current-buffer pgg-output-buffer
 612                              (buffer-string))
 613                            (with-current-buffer pgg-errors-buffer
 614                              (buffer-string)))))
 615               (error
 616                (mm-set-handle-multipart-parameter
 617                 mm-security-handle 'gnus-details (mml2015-format-error err))
 618                nil)
 619               (quit
 620                (mm-set-handle-multipart-parameter
 621                 mm-security-handle 'gnus-details "Quit.")
 622                nil))
 623             (progn
 624               (delete-file signature-file)
 625               (mm-set-handle-multipart-parameter
 626                mm-security-handle 'gnus-info
 627                (with-current-buffer pgg-errors-buffer
 628                  (mml2015-gpg-extract-signature-details))))
 629           (delete-file signature-file)
 630           (mm-set-handle-multipart-parameter
 631            mm-security-handle 'gnus-info "Failed")))))
 632   handle)
 633
 634 (defun mml2015-pgg-clear-verify ()
 635   (let ((pgg-errors-buffer mml2015-result-buffer)
 636         (text (buffer-string))
 637         (coding-system buffer-file-coding-system))
 638     (if (condition-case err
 639             (prog1
 640                 (mm-with-unibyte-buffer
 641                   (insert (mm-encode-coding-string text coding-system))
 642                   (pgg-verify-region (point-min) (point-max) nil t))
 643               (goto-char (point-min))
 644               (while (search-forward "\r\n" nil t)
 645                 (replace-match "\n" t t))
 646               (mm-set-handle-multipart-parameter
 647                mm-security-handle 'gnus-details
 648                (concat (with-current-buffer pgg-output-buffer
 649                          (buffer-string))
 650                        (with-current-buffer pgg-errors-buffer
 651                          (buffer-string)))))
 652           (error
 653            (mm-set-handle-multipart-parameter
 654             mm-security-handle 'gnus-details (mml2015-format-error err))
 655            nil)
 656           (quit
 657            (mm-set-handle-multipart-parameter
 658             mm-security-handle 'gnus-details "Quit.")
 659            nil))
 660         (mm-set-handle-multipart-parameter
 661          mm-security-handle 'gnus-info
 662          (with-current-buffer pgg-errors-buffer
 663            (mml2015-gpg-extract-signature-details)))
 664       (mm-set-handle-multipart-parameter
 665        mm-security-handle 'gnus-info "Failed")))
 666   (mml2015-extract-cleartext-signature))
 667
 668 (defun mml2015-pgg-sign (cont)
 669   (let ((pgg-errors-buffer mml2015-result-buffer)
 670         (boundary (mml-compute-boundary cont))
 671         (pgg-default-user-id (or (message-options-get 'mml-sender)
 672                                  pgg-default-user-id))
 673         (pgg-text-mode t)
 674         entry)
 675     (unless (pgg-sign-region (point-min) (point-max))
 676       (pop-to-buffer mml2015-result-buffer)
 677       (error "Sign error"))
 678     (goto-char (point-min))
 679     (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
 680                     boundary))
 681     (if (setq entry (assq 2 (pgg-parse-armor
 682                              (with-current-buffer pgg-output-buffer
 683                                (buffer-string)))))
 684         (setq entry (assq 'hash-algorithm (cdr entry))))
 685     (insert (format "\tmicalg=%s; "
 686                     (if (cdr entry)
 687                         (downcase (format "pgp-%s" (cdr entry)))
 688                       "pgp-sha1")))
 689     (insert "protocol=\"application/pgp-signature\"\n")
 690     (insert (format "\n--%s\n" boundary))
 691     (goto-char (point-max))
 692     (insert (format "\n--%s\n" boundary))
 693     (insert "Content-Type: application/pgp-signature\n\n")
 694     (insert-buffer-substring pgg-output-buffer)
 695     (goto-char (point-max))
 696     (insert (format "--%s--\n" boundary))
 697     (goto-char (point-max))))
 698
 699 (defun mml2015-pgg-encrypt (cont &optional sign)
 700   (let ((pgg-errors-buffer mml2015-result-buffer)
 701         (pgg-text-mode t)
 702         (boundary (mml-compute-boundary cont)))
 703     (unless (pgg-encrypt-region (point-min) (point-max)
 704                                 (split-string
 705                                  (or
 706                                   (message-options-get 'message-recipients)
 707                                   (message-options-set 'message-recipients
 708                                                        (read-string "Recipients: ")))
 709                                  "[ \f\t\n\r\v,]+")
 710                                 sign)
 711       (pop-to-buffer mml2015-result-buffer)
 712       (error "Encrypt error"))
 713     (delete-region (point-min) (point-max))
 714     (goto-char (point-min))
 715     (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
 716                     boundary))
 717     (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
 718     (insert (format "--%s\n" boundary))
 719     (insert "Content-Type: application/pgp-encrypted\n\n")
 720     (insert "Version: 1\n\n")
 721     (insert (format "--%s\n" boundary))
 722     (insert "Content-Type: application/octet-stream\n\n")
 723     (insert-buffer-substring pgg-output-buffer)
 724     (goto-char (point-max))
 725     (insert (format "--%s--\n" boundary))
 726     (goto-char (point-max))))
 727
 728 ;;; epg wrapper
 729
 730 (defvar epg-user-id-alist)
 731 (defvar epg-digest-algorithm-alist)
 732 (defvar inhibit-redisplay)
 733
 734 (autoload 'epg-make-context "epg")
 735 (autoload 'epg-context-set-armor "epg")
 736 (autoload 'epg-context-set-textmode "epg")
 737 (autoload 'epg-context-set-signers "epg")
 738 (autoload 'epg-context-result-for "epg")
 739 (autoload 'epg-new-signature-digest-algorithm "epg")
 740 (autoload 'epg-verify-result-to-string "epg")
 741 (autoload 'epg-list-keys "epg")
 742 (autoload 'epg-decrypt-string "epg")
 743 (autoload 'epg-verify-string "epg")
 744 (autoload 'epg-sign-string "epg")
 745 (autoload 'epg-encrypt-string "epg")
 746 (autoload 'epg-passphrase-callback-function "epg")
 747 (autoload 'epg-context-set-passphrase-callback "epg")
 748 (autoload 'epg-key-sub-key-list "epg")
 749 (autoload 'epg-sub-key-capability "epg")
 750 (autoload 'epg-sub-key-validity "epg")
 751 (autoload 'epg-sub-key-fingerprint "epg")
 752 (autoload 'epg-configuration "epg-config")
 753 (autoload 'epg-expand-group "epg-config")
 754 (autoload 'epa-select-keys "epa")
 755
 756 (defvar mml2015-epg-secret-key-id-list nil)
 757
 758 (defun mml2015-epg-passphrase-callback (context key-id ignore)
 759   (if (eq key-id 'SYM)
 760       (epg-passphrase-callback-function context key-id nil)
 761     (let* ((password-cache-key-id
 762             (if (eq key-id 'PIN)
 763                 "PIN"
 764                key-id))
 765            entry
 766            (passphrase
 767             (password-read
 768              (if (eq key-id 'PIN)
 769                  "Passphrase for PIN: "
 770                (if (setq entry (assoc key-id epg-user-id-alist))
 771                    (format "Passphrase for %s %s: " key-id (cdr entry))
 772                  (format "Passphrase for %s: " key-id)))
 773              password-cache-key-id)))
 774       (when passphrase
 775         (let ((password-cache-expiry mml2015-passphrase-cache-expiry))
 776           (password-cache-add password-cache-key-id passphrase))
 777         (setq mml2015-epg-secret-key-id-list
 778               (cons password-cache-key-id mml2015-epg-secret-key-id-list))
 779         (copy-sequence passphrase)))))
 780
 781 (defun mml2015-epg-find-usable-key (keys usage)
 782   (catch 'found
 783     (while keys
 784       (let ((pointer (epg-key-sub-key-list (car keys))))
 785         (while pointer
 786           (if (and (memq usage (epg-sub-key-capability (car pointer)))
 787                    (not (memq 'disabled (epg-sub-key-capability (car pointer))))
 788                    (not (memq (epg-sub-key-validity (car pointer))
 789                               '(revoked expired))))
 790               (throw 'found (car keys)))
 791           (setq pointer (cdr pointer))))
 792       (setq keys (cdr keys)))))
 793
 794 ;; XXX: since gpg --list-secret-keys does not return validity of each
 795 ;; key, `mml2015-epg-find-usable-key' defined above is not enough for
 796 ;; secret keys.  The function `mml2015-epg-find-usable-secret-key'
 797 ;; below looks at appropriate public keys to check usability.
 798 (defun mml2015-epg-find-usable-secret-key (context name usage)
 799   (let ((secret-keys (epg-list-keys context name t))
 800         secret-key)
 801     (while (and (not secret-key) secret-keys)
 802       (if (mml2015-epg-find-usable-key
 803            (epg-list-keys context (epg-sub-key-fingerprint
 804                                    (car (epg-key-sub-key-list
 805                                          (car secret-keys)))))
 806            usage)
 807           (setq secret-key (car secret-keys)
 808                 secret-keys nil)
 809         (setq secret-keys (cdr secret-keys))))
 810     secret-key))
 811
 812 (defun mml2015-epg-decrypt (handle ctl)
 813   (catch 'error
 814     (let ((inhibit-redisplay t)
 815           context plain child handles result decrypt-status)
 816       (unless (setq child (mm-find-part-by-type
 817                            (cdr handle)
 818                            "application/octet-stream" nil t))
 819         (mm-set-handle-multipart-parameter
 820          mm-security-handle 'gnus-info "Corrupted")
 821         (throw 'error handle))
 822       (setq context (epg-make-context))
 823       (if mml2015-cache-passphrase
 824           (epg-context-set-passphrase-callback
 825            context
 826            #'mml2015-epg-passphrase-callback))
 827       (condition-case error
 828           (setq plain (epg-decrypt-string context (mm-get-part child))
 829                 mml2015-epg-secret-key-id-list nil)
 830         (error
 831          (while mml2015-epg-secret-key-id-list
 832            (password-cache-remove (car mml2015-epg-secret-key-id-list))
 833            (setq mml2015-epg-secret-key-id-list
 834                  (cdr mml2015-epg-secret-key-id-list)))
 835          (mm-set-handle-multipart-parameter
 836           mm-security-handle 'gnus-info "Failed")
 837          (if (eq (car error) 'quit)
 838              (mm-set-handle-multipart-parameter
 839               mm-security-handle 'gnus-details "Quit.")
 840            (mm-set-handle-multipart-parameter
 841             mm-security-handle 'gnus-details (mml2015-format-error error)))
 842          (throw 'error handle)))
 843       (with-temp-buffer
 844         (insert plain)
 845         (goto-char (point-min))
 846         (while (search-forward "\r\n" nil t)
 847           (replace-match "\n" t t))
 848         (setq handles (mm-dissect-buffer t))
 849         (mm-destroy-parts handle)
 850         (if (epg-context-result-for context 'verify)
 851             (mm-set-handle-multipart-parameter
 852              mm-security-handle 'gnus-info
 853              (concat "OK\n"
 854                      (epg-verify-result-to-string
 855                       (epg-context-result-for context 'verify))))
 856           (mm-set-handle-multipart-parameter
 857            mm-security-handle 'gnus-info "OK"))
 858         (if (stringp (car handles))
 859             (mm-set-handle-multipart-parameter
 860              mm-security-handle 'gnus-details
 861              (mm-handle-multipart-ctl-parameter handles 'gnus-details))))
 862         (if (listp (car handles))
 863             handles
 864           (list handles)))))
 865
 866 (defun mml2015-epg-clear-decrypt ()
 867   (let ((inhibit-redisplay t)
 868         (context (epg-make-context))
 869         plain)
 870     (if mml2015-cache-passphrase
 871         (epg-context-set-passphrase-callback
 872          context
 873          #'mml2015-epg-passphrase-callback))
 874     (condition-case error
 875         (setq plain (epg-decrypt-string context (buffer-string))
 876               mml2015-epg-secret-key-id-list nil)
 877       (error
 878        (while mml2015-epg-secret-key-id-list
 879          (password-cache-remove (car mml2015-epg-secret-key-id-list))
 880          (setq mml2015-epg-secret-key-id-list
 881                (cdr mml2015-epg-secret-key-id-list)))
 882        (mm-set-handle-multipart-parameter
 883         mm-security-handle 'gnus-info "Failed")
 884        (if (eq (car error) 'quit)
 885            (mm-set-handle-multipart-parameter
 886             mm-security-handle 'gnus-details "Quit.")
 887          (mm-set-handle-multipart-parameter
 888           mm-security-handle 'gnus-details (mml2015-format-error error)))))
 889     (when plain
 890       (erase-buffer)
 891       ;; Treat data which epg returns as a unibyte string.
 892       (mm-disable-multibyte)
 893       (insert plain)
 894       (goto-char (point-min))
 895       (while (search-forward "\r\n" nil t)
 896         (replace-match "\n" t t))
 897       (mm-set-handle-multipart-parameter
 898        mm-security-handle 'gnus-info "OK")
 899       (if (epg-context-result-for context 'verify)
 900           (mm-set-handle-multipart-parameter
 901            mm-security-handle 'gnus-details
 902            (epg-verify-result-to-string
 903             (epg-context-result-for context 'verify)))))))
 904
 905 (defun mml2015-epg-verify (handle ctl)
 906   (catch 'error
 907     (let ((inhibit-redisplay t)
 908           context plain signature-file part signature)
 909       (when (or (null (setq part (mm-find-raw-part-by-type
 910                                   ctl (or (mm-handle-multipart-ctl-parameter
 911                                            ctl 'protocol)
 912                                           "application/pgp-signature")
 913                                   t)))
 914                 (null (setq signature (mm-find-part-by-type
 915                                        (cdr handle) "application/pgp-signature"
 916                                        nil t))))
 917         (mm-set-handle-multipart-parameter
 918          mm-security-handle 'gnus-info "Corrupted")
 919         (throw 'error handle))
 920       (setq part (mm-replace-in-string part "\n" "\r\n" t)
 921             signature (mm-get-part signature)
 922             context (epg-make-context))
 923       (condition-case error
 924           (setq plain (epg-verify-string context signature part))
 925         (error
 926          (mm-set-handle-multipart-parameter
 927           mm-security-handle 'gnus-info "Failed")
 928          (if (eq (car error) 'quit)
 929              (mm-set-handle-multipart-parameter
 930               mm-security-handle 'gnus-details "Quit.")
 931            (mm-set-handle-multipart-parameter
 932             mm-security-handle 'gnus-details (mml2015-format-error error)))
 933          (throw 'error handle)))
 934       (mm-set-handle-multipart-parameter
 935        mm-security-handle 'gnus-info
 936        (epg-verify-result-to-string (epg-context-result-for context 'verify)))
 937       handle)))
 938
 939 (defun mml2015-epg-clear-verify ()
 940   (let ((inhibit-redisplay t)
 941         (context (epg-make-context))
 942         (signature (mm-encode-coding-string (buffer-string)
 943                                             coding-system-for-write))
 944         plain)
 945     (condition-case error
 946         (setq plain (epg-verify-string context signature))
 947       (error
 948        (mm-set-handle-multipart-parameter
 949         mm-security-handle 'gnus-info "Failed")
 950        (if (eq (car error) 'quit)
 951            (mm-set-handle-multipart-parameter
 952             mm-security-handle 'gnus-details "Quit.")
 953          (mm-set-handle-multipart-parameter
 954           mm-security-handle 'gnus-details (mml2015-format-error error)))))
 955     (if plain
 956         (progn
 957           (mm-set-handle-multipart-parameter
 958            mm-security-handle 'gnus-info
 959            (epg-verify-result-to-string
 960             (epg-context-result-for context 'verify)))
 961           (delete-region (point-min) (point-max))
 962           (insert (mm-decode-coding-string plain coding-system-for-read)))
 963       (mml2015-extract-cleartext-signature))))
 964
 965 (defun mml2015-epg-sign (cont)
 966   (let* ((inhibit-redisplay t)
 967          (context (epg-make-context))
 968          (boundary (mml-compute-boundary cont))
 969          (sender (message-options-get 'message-sender))
 970          (signer-names (or mml2015-signers
 971                            (if (and mml2015-sign-with-sender sender)
 972                                (list (concat "<" sender ">")))))
 973          signer-key
 974          (signers
 975           (or (message-options-get 'mml2015-epg-signers)
 976               (message-options-set
 977                'mml2015-epg-signers
 978                (if (eq mm-sign-option 'guided)
 979                    (epa-select-keys context "\
 980 Select keys for signing.
 981 If no one is selected, default secret key is used.  "
 982                                     signer-names
 983                                     t)
 984                  (if (or sender mml2015-signers)
 985                      (delq nil
 986                            (mapcar
 987                             (lambda (signer)
 988                               (setq signer-key
 989                                     (mml2015-epg-find-usable-secret-key
 990                                      context signer 'sign))
 991                               (unless (or signer-key
 992                                           (y-or-n-p
 993                                            (format
 994                                             "No secret key for %s; skip it? "
 995                                             signer)))
 996                                 (error "No secret key for %s" signer))
 997                               signer-key)
 998                             signer-names)))))))
 999          signature micalg)
1000     (epg-context-set-armor context t)
1001     (epg-context-set-textmode context t)
1002     (epg-context-set-signers context signers)
1003     (if mml2015-cache-passphrase
1004         (epg-context-set-passphrase-callback
1005          context
1006          #'mml2015-epg-passphrase-callback))
1007     (condition-case error
1008         (setq signature (epg-sign-string context (buffer-string) t)
1009               mml2015-epg-secret-key-id-list nil)
1010       (error
1011        (while mml2015-epg-secret-key-id-list
1012          (password-cache-remove (car mml2015-epg-secret-key-id-list))
1013          (setq mml2015-epg-secret-key-id-list
1014                (cdr mml2015-epg-secret-key-id-list)))
1015        (signal (car error) (cdr error))))
1016     (if (epg-context-result-for context 'sign)
1017         (setq micalg (epg-new-signature-digest-algorithm
1018                       (car (epg-context-result-for context 'sign)))))
1019     (goto-char (point-min))
1020     (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
1021                     boundary))
1022     (if micalg
1023         (insert (format "\tmicalg=pgp-%s; "
1024                         (downcase
1025                          (cdr (assq micalg
1026                                     epg-digest-algorithm-alist))))))
1027     (insert "protocol=\"application/pgp-signature\"\n")
1028     (insert (format "\n--%s\n" boundary))
1029     (goto-char (point-max))
1030     (insert (format "\n--%s\n" boundary))
1031     (insert "Content-Type: application/pgp-signature\n\n")
1032     (insert signature)
1033     (goto-char (point-max))
1034     (insert (format "--%s--\n" boundary))
1035     (goto-char (point-max))))
1036
1037 (defun mml2015-epg-encrypt (cont &optional sign)
1038   (let* ((inhibit-redisplay t)
1039          (context (epg-make-context))
1040          (boundary (mml-compute-boundary cont))
1041          (config (epg-configuration))
1042          (recipients (message-options-get 'mml2015-epg-recipients))
1043          cipher
1044          (sender (message-options-get 'message-sender))
1045          (signer-names (or mml2015-signers
1046                            (if (and mml2015-sign-with-sender sender)
1047                                (list (concat "<" sender ">")))))
1048          signers
1049          recipient-key signer-key)
1050     (unless recipients
1051       (setq recipients
1052             (apply #'nconc
1053                    (mapcar
1054                     (lambda (recipient)
1055                       (or (epg-expand-group config recipient)
1056                           (list (concat "<" recipient ">"))))
1057                     (split-string
1058                      (or (message-options-get 'message-recipients)
1059                          (message-options-set 'message-recipients
1060                                               (read-string "Recipients: ")))
1061                      "[ \f\t\n\r\v,]+"))))
1062       (when mml2015-encrypt-to-self
1063         (unless signer-names
1064           (error "Neither message sender nor mml2015-signers are set"))
1065         (setq recipients (nconc recipients signer-names)))
1066       (if (eq mm-encrypt-option 'guided)
1067           (setq recipients
1068                 (epa-select-keys context "\
1069 Select recipients for encryption.
1070 If no one is selected, symmetric encryption will be performed.  "
1071                                  recipients))
1072         (setq recipients
1073               (delq nil
1074                     (mapcar
1075                      (lambda (recipient)
1076                        (setq recipient-key (mml2015-epg-find-usable-key
1077                                             (epg-list-keys context recipient)
1078                                             'encrypt))
1079                        (unless (or recipient-key
1080                                    (y-or-n-p
1081                                     (format "No public key for %s; skip it? "
1082                                             recipient)))
1083                          (error "No public key for %s" recipient))
1084                        recipient-key)
1085                      recipients)))
1086         (unless recipients
1087           (error "No recipient specified")))
1088       (message-options-set 'mml2015-epg-recipients recipients))
1089     (when sign
1090       (setq signers
1091             (or (message-options-get 'mml2015-epg-signers)
1092                 (message-options-set
1093                  'mml2015-epg-signers
1094                  (if (eq mm-sign-option 'guided)
1095                      (epa-select-keys context "\
1096 Select keys for signing.
1097 If no one is selected, default secret key is used.  "
1098                                       signer-names
1099                                       t)
1100                    (if (or sender mml2015-signers)
1101                        (delq nil
1102                              (mapcar
1103                               (lambda (signer)
1104                                 (setq signer-key
1105                                       (mml2015-epg-find-usable-secret-key
1106                                        context signer 'sign))
1107                                 (unless (or signer-key
1108                                             (y-or-n-p
1109                                              (format
1110                                               "No secret key for %s; skip it? "
1111                                               signer)))
1112                                   (error "No secret key for %s" signer))
1113                                 signer-key)
1114                               signer-names)))))))
1115       (epg-context-set-signers context signers))
1116     (epg-context-set-armor context t)
1117     (epg-context-set-textmode context t)
1118     (if mml2015-cache-passphrase
1119         (epg-context-set-passphrase-callback
1120          context
1121          #'mml2015-epg-passphrase-callback))
1122     (condition-case error
1123         (setq cipher
1124               (epg-encrypt-string context (buffer-string) recipients sign
1125                                   mml2015-always-trust)
1126               mml2015-epg-secret-key-id-list nil)
1127       (error
1128        (while mml2015-epg-secret-key-id-list
1129          (password-cache-remove (car mml2015-epg-secret-key-id-list))
1130          (setq mml2015-epg-secret-key-id-list
1131                (cdr mml2015-epg-secret-key-id-list)))
1132        (signal (car error) (cdr error))))
1133     (delete-region (point-min) (point-max))
1134     (goto-char (point-min))
1135     (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
1136                     boundary))
1137     (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
1138     (insert (format "--%s\n" boundary))
1139     (insert "Content-Type: application/pgp-encrypted\n\n")
1140     (insert "Version: 1\n\n")
1141     (insert (format "--%s\n" boundary))
1142     (insert "Content-Type: application/octet-stream\n\n")
1143     (insert cipher)
1144     (goto-char (point-max))
1145     (insert (format "--%s--\n" boundary))
1146     (goto-char (point-max))))
1147
1148 ;;; General wrapper
1149
1150 (autoload 'gnus-buffer-live-p "gnus-util")
1151 (autoload 'gnus-get-buffer-create "gnus")
1152
1153 (defun mml2015-clean-buffer ()
1154   (if (gnus-buffer-live-p mml2015-result-buffer)
1155       (with-current-buffer mml2015-result-buffer
1156         (erase-buffer)
1157         t)
1158     (setq mml2015-result-buffer
1159           (gnus-get-buffer-create " *MML2015 Result*"))
1160     nil))
1161
1162 (defsubst mml2015-clear-decrypt-function ()
1163   (nth 6 (assq mml2015-use mml2015-function-alist)))
1164
1165 (defsubst mml2015-clear-verify-function ()
1166   (nth 5 (assq mml2015-use mml2015-function-alist)))
1167
1168 ;;;###autoload
1169 (defun mml2015-decrypt (handle ctl)
1170   (mml2015-clean-buffer)
1171   (let ((func (nth 4 (assq mml2015-use mml2015-function-alist))))
1172     (if func
1173         (funcall func handle ctl)
1174       handle)))
1175
1176 ;;;###autoload
1177 (defun mml2015-decrypt-test (handle ctl)
1178   mml2015-use)
1179
1180 ;;;###autoload
1181 (defun mml2015-verify (handle ctl)
1182   (mml2015-clean-buffer)
1183   (let ((func (nth 3 (assq mml2015-use mml2015-function-alist))))
1184     (if func
1185         (funcall func handle ctl)
1186       handle)))
1187
1188 ;;;###autoload
1189 (defun mml2015-verify-test (handle ctl)
1190   mml2015-use)
1191
1192 ;;;###autoload
1193 (defun mml2015-encrypt (cont &optional sign)
1194   (mml2015-clean-buffer)
1195   (let ((func (nth 2 (assq mml2015-use mml2015-function-alist))))
1196     (if func
1197         (funcall func cont sign)
1198       (error "Cannot find encrypt function"))))
1199
1200 ;;;###autoload
1201 (defun mml2015-sign (cont)
1202   (mml2015-clean-buffer)
1203   (let ((func (nth 1 (assq mml2015-use mml2015-function-alist))))
1204     (if func
1205         (funcall func cont)
1206       (error "Cannot find sign function"))))
1207
1208 ;;;###autoload
1209 (defun mml2015-self-encrypt ()
1210   (mml2015-encrypt nil))
1211
1212 (provide 'mml2015)
1213
1214 ;;; mml2015.el ends here