contrib/sb-md5/md5.lisp

   1 ;;;; This file implements The MD5 Message-Digest Algorithm, as defined in
   2 ;;;; RFC 1321 by R. Rivest, published April 1992.
   3 ;;;;
   4 ;;;; It was written by Pierre R. Mai, with copious input from the
   5 ;;;; cmucl-help mailing-list hosted at cons.org, in November 2001 and
   6 ;;;; has been placed into the public domain.
   7 ;;;;
   8 ;;;; $Id$
   9 ;;;;
  10 ;;;; While the implementation should work on all conforming Common
  11 ;;;; Lisp implementations, it has only been optimized for CMU CL,
  12 ;;;; where it achieved comparable performance to the standard md5sum
  13 ;;;; utility (within a factor of 1.5 or less on iA32 and UltraSparc
  14 ;;;; hardware).
  15 ;;;;
  16 ;;;; Since the implementation makes heavy use of arithmetic on
  17 ;;;; (unsigned-byte 32) numbers, acceptable performance is likely only
  18 ;;;; on CL implementations that support unboxed arithmetic on such
  19 ;;;; numbers in some form.  For other CL implementations a 16bit
  20 ;;;; implementation of MD5 is probably more suitable.
  21 ;;;;
  22 ;;;; The code implements correct operation for files of unbounded size
  23 ;;;; as is, at the cost of having to do a single generic integer
  24 ;;;; addition for each call to update-md5-state.  If you call
  25 ;;;; update-md5-state frequently with little data, this can pose a
  26 ;;;; performance problem.  If you can live with a size restriction of
  27 ;;;; 512 MB, then you can enable fast fixnum arithmetic by putting
  28 ;;;; :md5-small-length onto *features* prior to compiling this file.
  29 ;;;;
  30 ;;;; This software is "as is", and has no warranty of any kind.  The
  31 ;;;; authors assume no responsibility for the consequences of any use
  32 ;;;; of this software.
  33
  34 (defpackage :SB-MD5 (:use :CL)
  35   (:export
  36    ;; Low-Level types and functions
  37    #:md5-regs #:initial-md5-regs #:md5regs-digest
  38    #:update-md5-block #:fill-block #:fill-block-ub8 #:fill-block-char
  39    ;; Mid-Level types and functions
  40    #:md5-state #:md5-state-p #:make-md5-state
  41    #:update-md5-state #:finalize-md5-state
  42    ;; High-Level functions on sequences, streams and files
  43    #:md5sum-sequence #:md5sum-stream #:md5sum-file))
  44
  45 (in-package :SB-MD5)
  46
  47 #+cmu
  48 (eval-when (:compile-toplevel)
  49   (defparameter *old-expansion-limit* ext:*inline-expansion-limit*)
  50   (setq ext:*inline-expansion-limit* (max ext:*inline-expansion-limit* 1000)))
  51
  52 #+cmu
  53 (eval-when (:compile-toplevel :execute)
  54   (defparameter *old-features* *features*)
  55   (pushnew (c:backend-byte-order c:*target-backend*) *features*))
  56
  57 #+sbcl
  58 (eval-when (:compile-toplevel)
  59   (defparameter *old-features* *features*)
  60   (pushnew sb-c:*backend-byte-order* *features*))
  61
  62 ;;; Section 2:  Basic Datatypes
  63
  64 (deftype ub32 ()
  65   "Corresponds to the 32bit quantity word of the MD5 Spec"
  66   `(unsigned-byte 32))
  67
  68 (defmacro assemble-ub32 (a b c d)
  69   "Assemble an ub32 value from the given (unsigned-byte 8) values,
  70 where a is the intended low-order byte and d the high-order byte."
  71   `(the ub32 (logior (ash ,d 24) (ash ,c 16) (ash ,b 8) ,a)))
  72
  73 ;;; Section 3.4:  Auxilliary functions
  74
  75 (declaim (inline f g h i)
  76          (ftype (function (ub32 ub32 ub32) ub32) f g h i))
  77
  78 (defun f (x y z)
  79   (declare (type ub32 x y z)
  80            (optimize (speed 3) (safety 0) (space 0) (debug 0)))
  81   #+cmu
  82   (kernel:32bit-logical-or (kernel:32bit-logical-and x y)
  83                            (kernel:32bit-logical-andc1 x z))
  84   #-cmu
  85   (logior (logand x y) (logandc1 x z)))
  86
  87 (defun g (x y z)
  88   (declare (type ub32 x y z)
  89            (optimize (speed 3) (safety 0) (space 0) (debug 0)))
  90   #+cmu
  91   (kernel:32bit-logical-or (kernel:32bit-logical-and x z)
  92                            (kernel:32bit-logical-andc2 y z))
  93   #-cmu
  94   (logior (logand x z) (logandc2 y z)))
  95
  96 (defun h (x y z)
  97   (declare (type ub32 x y z)
  98            (optimize (speed 3) (safety 0) (space 0) (debug 0)))
  99   #+cmu
 100   (kernel:32bit-logical-xor x (kernel:32bit-logical-xor y z))
 101   #-cmu
 102   (logxor x y z))
 103
 104 (defun i (x y z)
 105   (declare (type ub32 x y z)
 106            (optimize (speed 3) (safety 0) (space 0) (debug 0)))
 107   #+cmu
 108   (kernel:32bit-logical-xor y (kernel:32bit-logical-orc2 x z))
 109   #-cmu
 110   (ldb (byte 32 0) (logxor y (logorc2 x z))))
 111
 112 (declaim (inline mod32+)
 113          (ftype (function (ub32 ub32) ub32) mod32+))
 114 (defun mod32+ (a b)
 115   (declare (type ub32 a b) (optimize (speed 3) (safety 0) (space 0) (debug 0)))
 116   (ldb (byte 32 0) (+ a b)))
 117
 118 #+cmu
 119 (define-compiler-macro mod32+ (a b)
 120   `(ext:truly-the ub32 (+ ,a ,b)))
 121
 122 ;;; Dunno why we need this, but without it MOD32+ wasn't being
 123 ;;; inlined.  Oh well.  -- CSR, 2003-09-14
 124 #+sbcl
 125 (define-compiler-macro mod32+ (a b)
 126   `(ldb (byte 32 0) (+ ,a ,b)))
 127
 128 (declaim (inline rol32)
 129          (ftype (function (ub32 (unsigned-byte 5)) ub32) rol32))
 130 (defun rol32 (a s)
 131   (declare (type ub32 a) (type (unsigned-byte 5) s)
 132            (optimize (speed 3) (safety 0) (space 0) (debug 0)))
 133   #+cmu
 134   (kernel:32bit-logical-or #+little-endian (kernel:shift-towards-end a s)
 135                            #+big-endian (kernel:shift-towards-start a s)
 136                            (ash a (- s 32)))
 137   #+sbcl
 138   (sb-rotate-byte:rotate-byte s (byte 32 0) a)
 139   #-(or cmu sbcl)
 140   (logior (ldb (byte 32 0) (ash a s)) (ash a (- s 32))))
 141
 142 ;;; Section 3.4:  Table T
 143
 144 (eval-when (:compile-toplevel :load-toplevel :execute)
 145   (defparameter *t* (make-array 64 :element-type 'ub32
 146                                 :initial-contents
 147                                 (loop for i from 1 to 64
 148                                       collect
 149                                       (truncate
 150                                        (* 4294967296
 151                                           (abs (sin (float i 0.0d0)))))))))
 152
 153 ;;; Section 3.4:  Helper Macro for single round definitions
 154
 155 (defmacro with-md5-round ((op block) &rest clauses)
 156   (loop for (a b c d k s i) in clauses
 157         collect
 158         `(setq ,a (mod32+ ,b (rol32 (mod32+ (mod32+ ,a (,op ,b ,c ,d))
 159                                             (mod32+ (aref ,block ,k)
 160                                                     ,(aref *t* (1- i))))
 161                                     ,s)))
 162         into result
 163         finally
 164         (return `(progn ,@result))))
 165
 166 ;;; Section 3.3:  (Initial) MD5 Working Set
 167
 168 (deftype md5-regs ()
 169   "The working state of the MD5 algorithm, which contains the 4 32-bit
 170 registers A, B, C and D."
 171   `(simple-array (unsigned-byte 32) (4)))
 172
 173 (defmacro md5-regs-a (regs)
 174   `(aref ,regs 0))
 175
 176 (defmacro md5-regs-b (regs)
 177   `(aref ,regs 1))
 178
 179 (defmacro md5-regs-c (regs)
 180   `(aref ,regs 2))
 181
 182 (defmacro md5-regs-d (regs)
 183   `(aref ,regs 3))
 184
 185 (defconstant +md5-magic-a+ (assemble-ub32 #x01 #x23 #x45 #x67)
 186   "Initial value of Register A of the MD5 working state.")
 187 (defconstant +md5-magic-b+ (assemble-ub32 #x89 #xab #xcd #xef)
 188   "Initial value of Register B of the MD5 working state.")
 189 (defconstant +md5-magic-c+ (assemble-ub32 #xfe #xdc #xba #x98)
 190   "Initial value of Register C of the MD5 working state.")
 191 (defconstant +md5-magic-d+ (assemble-ub32 #x76 #x54 #x32 #x10)
 192   "Initial value of Register D of the MD5 working state.")
 193
 194 (declaim (inline initial-md5-regs))
 195 (defun initial-md5-regs ()
 196   "Create the initial working state of an MD5 run."
 197   (declare (optimize (speed 3) (safety 0) (space 0) (debug 0)))
 198   (let ((regs (make-array 4 :element-type '(unsigned-byte 32))))
 199     (declare (type md5-regs regs))
 200     (setf (md5-regs-a regs) +md5-magic-a+
 201           (md5-regs-b regs) +md5-magic-b+
 202           (md5-regs-c regs) +md5-magic-c+
 203           (md5-regs-d regs) +md5-magic-d+)
 204     regs))
 205
 206 ;;; Section 3.4:  Operation on 16-Word Blocks
 207
 208 (defun update-md5-block (regs block)
 209   "This is the core part of the MD5 algorithm.  It takes a complete 16
 210 word block of input, and updates the working state in A, B, C, and D
 211 accordingly."
 212   (declare (type md5-regs regs)
 213            (type (simple-array ub32 (16)) block)
 214            (optimize (speed 3) (safety 0) (space 0) (debug 0)))
 215   (let ((a (md5-regs-a regs)) (b (md5-regs-b regs))
 216         (c (md5-regs-c regs)) (d (md5-regs-d regs)))
 217     (declare (type ub32 a b c d))
 218     ;; Round 1
 219     (with-md5-round (f block)
 220       (A B C D  0  7  1)(D A B C  1 12  2)(C D A B  2 17  3)(B C D A  3 22  4)
 221       (A B C D  4  7  5)(D A B C  5 12  6)(C D A B  6 17  7)(B C D A  7 22  8)
 222       (A B C D  8  7  9)(D A B C  9 12 10)(C D A B 10 17 11)(B C D A 11 22 12)
 223       (A B C D 12  7 13)(D A B C 13 12 14)(C D A B 14 17 15)(B C D A 15 22 16))
 224     ;; Round 2
 225     (with-md5-round (g block)
 226       (A B C D  1  5 17)(D A B C  6  9 18)(C D A B 11 14 19)(B C D A  0 20 20)
 227       (A B C D  5  5 21)(D A B C 10  9 22)(C D A B 15 14 23)(B C D A  4 20 24)
 228       (A B C D  9  5 25)(D A B C 14  9 26)(C D A B  3 14 27)(B C D A  8 20 28)
 229       (A B C D 13  5 29)(D A B C  2  9 30)(C D A B  7 14 31)(B C D A 12 20 32))
 230     ;; Round 3
 231     (with-md5-round (h block)
 232       (A B C D  5  4 33)(D A B C  8 11 34)(C D A B 11 16 35)(B C D A 14 23 36)
 233       (A B C D  1  4 37)(D A B C  4 11 38)(C D A B  7 16 39)(B C D A 10 23 40)
 234       (A B C D 13  4 41)(D A B C  0 11 42)(C D A B  3 16 43)(B C D A  6 23 44)
 235       (A B C D  9  4 45)(D A B C 12 11 46)(C D A B 15 16 47)(B C D A  2 23 48))
 236     ;; Round 4
 237     (with-md5-round (i block)
 238       (A B C D  0  6 49)(D A B C  7 10 50)(C D A B 14 15 51)(B C D A  5 21 52)
 239       (A B C D 12  6 53)(D A B C  3 10 54)(C D A B 10 15 55)(B C D A  1 21 56)
 240       (A B C D  8  6 57)(D A B C 15 10 58)(C D A B  6 15 59)(B C D A 13 21 60)
 241       (A B C D  4  6 61)(D A B C 11 10 62)(C D A B  2 15 63)(B C D A  9 21 64))
 242     ;; Update and return
 243     (setf (md5-regs-a regs) (mod32+ (md5-regs-a regs) a)
 244           (md5-regs-b regs) (mod32+ (md5-regs-b regs) b)
 245           (md5-regs-c regs) (mod32+ (md5-regs-c regs) c)
 246           (md5-regs-d regs) (mod32+ (md5-regs-d regs) d))
 247     regs))
 248
 249 ;;; Section 3.4:  Converting 8bit-vectors into 16-Word Blocks
 250
 251 (declaim (inline fill-block fill-block-ub8 fill-block-char))
 252 (defun fill-block (block buffer offset)
 253   "Convert a complete 64 byte input vector segment into the given 16
 254 word MD5 block.  This currently works on (unsigned-byte 8) and
 255 character simple-arrays, via the functions `fill-block-ub8' and
 256 `fill-block-char' respectively."
 257   (declare (type (integer 0 #.(- most-positive-fixnum 64)) offset)
 258            (type (simple-array ub32 (16)) block)
 259            (type (simple-array * (*)) buffer)
 260            (optimize (speed 3) (safety 0) (space 0) (debug 0)))
 261   (etypecase buffer
 262     ((simple-array (unsigned-byte 8) (*))
 263      (fill-block-ub8 block buffer offset))
 264     (simple-string
 265      (fill-block-char block buffer offset))))
 266
 267 (defun fill-block-ub8 (block buffer offset)
 268   "Convert a complete 64 (unsigned-byte 8) input vector segment
 269 starting from offset into the given 16 word MD5 block."
 270   (declare (type (integer 0 #.(- most-positive-fixnum 64)) offset)
 271            (type (simple-array ub32 (16)) block)
 272            (type (simple-array (unsigned-byte 8) (*)) buffer)
 273            (optimize (speed 3) (safety 0) (space 0) (debug 0)))
 274   #+(and :cmu :little-endian)
 275   (kernel:bit-bash-copy
 276    buffer (+ (* vm:vector-data-offset vm:word-bits) (* offset vm:byte-bits))
 277    block (* vm:vector-data-offset vm:word-bits)
 278    (* 64 vm:byte-bits))
 279   #+(and :sbcl :little-endian)
 280   (sb-kernel:bit-bash-copy
 281    buffer (+ (* sb-vm:vector-data-offset sb-vm:n-word-bits)
 282              (* offset sb-vm:n-byte-bits))
 283    block (* sb-vm:vector-data-offset sb-vm:n-word-bits)
 284    (* 64 sb-vm:n-byte-bits))
 285   #-(or (and :sbcl :little-endian) (and :cmu :little-endian))
 286   (loop for i of-type (integer 0 16) from 0
 287         for j of-type (integer 0 #.most-positive-fixnum)
 288         from offset to (+ offset 63) by 4
 289         do
 290         (setf (aref block i)
 291               (assemble-ub32 (aref buffer j)
 292                              (aref buffer (+ j 1))
 293                              (aref buffer (+ j 2))
 294                              (aref buffer (+ j 3))))))
 295
 296 (defun fill-block-char (block buffer offset)
 297   "Convert a complete 64 character input string segment starting from
 298 offset into the given 16 word MD5 block."
 299   (declare (type (integer 0 #.(- most-positive-fixnum 64)) offset)
 300            (type (simple-array ub32 (16)) block)
 301            (type simple-string buffer)
 302            (optimize (speed 3) (safety 0) (space 0) (debug 0)))
 303   #+(and :cmu :little-endian)
 304   (kernel:bit-bash-copy
 305    buffer (+ (* vm:vector-data-offset vm:word-bits) (* offset vm:byte-bits))
 306    block (* vm:vector-data-offset vm:word-bits)
 307    (* 64 vm:byte-bits))
 308   #+(and :sbcl :little-endian)
 309   (sb-kernel:bit-bash-copy
 310    buffer (+ (* sb-vm:vector-data-offset sb-vm:n-word-bits)
 311              (* offset sb-vm:n-byte-bits))
 312    block (* sb-vm:vector-data-offset sb-vm:n-word-bits)
 313    (* 64 sb-vm:n-byte-bits))
 314   #-(or (and :sbcl :little-endian) (and :cmu :little-endian))
 315   (loop for i of-type (integer 0 16) from 0
 316         for j of-type (integer 0 #.most-positive-fixnum)
 317         from offset to (+ offset 63) by 4
 318         do
 319         (setf (aref block i)
 320               (assemble-ub32 (char-code (schar buffer j))
 321                              (char-code (schar buffer (+ j 1)))
 322                              (char-code (schar buffer (+ j 2)))
 323                              (char-code (schar buffer (+ j 3)))))))
 324
 325 ;;; Section 3.5:  Message Digest Output
 326
 327 (declaim (inline md5regs-digest))
 328 (defun md5regs-digest (regs)
 329   "Create the final 16 byte message-digest from the MD5 working state
 330 in regs.  Returns a (simple-array (unsigned-byte 8) (16))."
 331   (declare (optimize (speed 3) (safety 0) (space 0) (debug 0))
 332            (type md5-regs regs))
 333   (let ((result (make-array 16 :element-type '(unsigned-byte 8))))
 334     (declare (type (simple-array (unsigned-byte 8) (16)) result))
 335     (macrolet ((frob (reg offset)
 336                  (let ((var (gensym)))
 337                    `(let ((,var ,reg))
 338                       (declare (type ub32 ,var))
 339                       (setf
 340                        (aref result ,offset) (ldb (byte 8 0) ,var)
 341                        (aref result ,(+ offset 1)) (ldb (byte 8 8) ,var)
 342                        (aref result ,(+ offset 2)) (ldb (byte 8 16) ,var)
 343                        (aref result ,(+ offset 3)) (ldb (byte 8 24) ,var))))))
 344       (frob (md5-regs-a regs) 0)
 345       (frob (md5-regs-b regs) 4)
 346       (frob (md5-regs-c regs) 8)
 347       (frob (md5-regs-d regs) 12))
 348     result))
 349
 350 ;;; Mid-Level Drivers
 351
 352 (defstruct (md5-state
 353              (:constructor make-md5-state ())
 354              (:copier))
 355   (regs (initial-md5-regs) :type md5-regs :read-only t)
 356   (amount 0 :type
 357           #-md5-small-length (integer 0 *)
 358           #+md5-small-length (unsigned-byte 29))
 359   (block (make-array 16 :element-type '(unsigned-byte 32)) :read-only t
 360          :type (simple-array (unsigned-byte 32) (16)))
 361   (buffer (make-array 64 :element-type '(unsigned-byte 8)) :read-only t
 362          :type (simple-array (unsigned-byte 8) (64)))
 363   (buffer-index 0 :type (integer 0 63))
 364   (finalized-p nil))
 365
 366 (declaim (inline copy-to-buffer))
 367 (defun copy-to-buffer (from from-offset count buffer buffer-offset)
 368   "Copy a partial segment from input vector from starting at
 369 from-offset and copying count elements into the 64 byte buffer
 370 starting at buffer-offset."
 371   (declare (optimize (speed 3) (safety 0) (space 0) (debug 0))
 372            (type (unsigned-byte 29) from-offset)
 373            (type (integer 0 63) count buffer-offset)
 374            (type (simple-array * (*)) from)
 375            (type (simple-array (unsigned-byte 8) (64)) buffer))
 376   #+cmu
 377   (kernel:bit-bash-copy
 378    from (+ (* vm:vector-data-offset vm:word-bits) (* from-offset vm:byte-bits))
 379    buffer (+ (* vm:vector-data-offset vm:word-bits)
 380              (* buffer-offset vm:byte-bits))
 381    (* count vm:byte-bits))
 382   #+sbcl
 383   (sb-kernel:bit-bash-copy
 384    from (+ (* sb-vm:vector-data-offset sb-vm:n-word-bits)
 385            (* from-offset sb-vm:n-byte-bits))
 386    buffer (+ (* sb-vm:vector-data-offset sb-vm:n-word-bits)
 387              (* buffer-offset sb-vm:n-byte-bits))
 388    (* count sb-vm:n-byte-bits))
 389   #-(or cmu sbcl)
 390   (etypecase from
 391     (simple-string
 392      (loop for buffer-index of-type (integer 0 64) from buffer-offset
 393            for from-index of-type fixnum from from-offset
 394            below (+ from-offset count)
 395            do
 396            (setf (aref buffer buffer-index)
 397                  (char-code (schar (the simple-string from) from-index)))))
 398     ((simple-array (unsigned-byte 8) (*))
 399      (loop for buffer-index of-type (integer 0 64) from buffer-offset
 400            for from-index of-type fixnum from from-offset
 401            below (+ from-offset count)
 402            do
 403            (setf (aref buffer buffer-index)
 404                  (aref (the (simple-array (unsigned-byte 8) (*)) from)
 405                        from-index))))))
 406
 407 (defun update-md5-state (state sequence &key (start 0) (end (length sequence)))
 408   "Update the given md5-state from sequence, which is either a
 409 simple-string or a simple-array with element-type (unsigned-byte 8),
 410 bounded by start and end, which must be numeric bounding-indices."
 411   (declare (type md5-state state)
 412            (type (simple-array * (*)) sequence)
 413            (type fixnum start end)
 414            (optimize (speed 3) #+(or cmu sbcl) (safety 0) (space 0) (debug 0))
 415            #+cmu
 416            (ext:optimize-interface (safety 1) (debug 1)))
 417   (let ((regs (md5-state-regs state))
 418         (block (md5-state-block state))
 419         (buffer (md5-state-buffer state))
 420         (buffer-index (md5-state-buffer-index state))
 421         (length (- end start)))
 422     (declare (type md5-regs regs) (type fixnum length)
 423              (type (integer 0 63) buffer-index)
 424              (type (simple-array (unsigned-byte 32) (16)) block)
 425              (type (simple-array (unsigned-byte 8) (64)) buffer))
 426     ;; Handle old rest
 427     (unless (zerop buffer-index)
 428       (let ((amount (min (- 64 buffer-index) length)))
 429         (declare (type (integer 0 63) amount))
 430         (copy-to-buffer sequence start amount buffer buffer-index)
 431         (setq start (the fixnum (+ start amount)))
 432         (when (>= start end)
 433           (setf (md5-state-buffer-index state) (+ buffer-index amount))
 434           (return-from update-md5-state state)))
 435       (fill-block-ub8 block buffer 0)
 436       (update-md5-block regs block))
 437     ;; Handle main-part and new-rest
 438     (etypecase sequence
 439       ((simple-array (unsigned-byte 8) (*))
 440        (locally
 441            (declare (type (simple-array (unsigned-byte 8) (*)) sequence))
 442          (loop for offset of-type (unsigned-byte 29) from start below end by 64
 443                until (< (- end offset) 64)
 444                do
 445                (fill-block-ub8 block sequence offset)
 446                (update-md5-block regs block)
 447                finally
 448                (let ((amount (- end offset)))
 449                  (unless (zerop amount)
 450                    (copy-to-buffer sequence offset amount buffer 0))
 451                  (setf (md5-state-buffer-index state) amount)))))
 452       (simple-string
 453        (locally
 454            (declare (type simple-string sequence))
 455          (loop for offset of-type (unsigned-byte 29) from start below end by 64
 456                until (< (- end offset) 64)
 457                do
 458                (fill-block-char block sequence offset)
 459                (update-md5-block regs block)
 460                finally
 461                (let ((amount (- end offset)))
 462                  (unless (zerop amount)
 463                    (copy-to-buffer sequence offset amount buffer 0))
 464                  (setf (md5-state-buffer-index state) amount))))))
 465     (setf (md5-state-amount state)
 466           #-md5-small-length (+ (md5-state-amount state) length)
 467           #+md5-small-length (the (unsigned-byte 29)
 468                                (+ (md5-state-amount state) length)))
 469     state))
 470
 471 (defun finalize-md5-state (state)
 472   "If the given md5-state has not already been finalized, finalize it,
 473 by processing any remaining input in its buffer, with suitable padding
 474 and appended bit-length, as specified by the MD5 standard.
 475
 476 The resulting MD5 message-digest is returned as an array of sixteen
 477 (unsigned-byte 8) values.  Calling `update-md5-state' after a call to
 478 `finalize-md5-state' results in unspecified behaviour."
 479   (declare (type md5-state state)
 480            (optimize (speed 3) #+(or cmu sbcl) (safety 0) (space 0) (debug 0))
 481            #+cmu
 482            (ext:optimize-interface (safety 1) (debug 1)))
 483   (or (md5-state-finalized-p state)
 484       (let ((regs (md5-state-regs state))
 485             (block (md5-state-block state))
 486             (buffer (md5-state-buffer state))
 487             (buffer-index (md5-state-buffer-index state))
 488             (total-length (* 8 (md5-state-amount state))))
 489         (declare (type md5-regs regs)
 490                  (type (integer 0 63) buffer-index)
 491                  (type (simple-array ub32 (16)) block)
 492                  (type (simple-array (unsigned-byte 8) (*)) buffer))
 493         ;; Add mandatory bit 1 padding
 494         (setf (aref buffer buffer-index) #x80)
 495         ;; Fill with 0 bit padding
 496         (loop for index of-type (integer 0 64)
 497               from (1+ buffer-index) below 64
 498               do (setf (aref buffer index) #x00))
 499         (fill-block-ub8 block buffer 0)
 500         ;; Flush block first if length wouldn't fit
 501         (when (>= buffer-index 56)
 502           (update-md5-block regs block)
 503           ;; Create new fully 0 padded block
 504           (loop for index of-type (integer 0 16) from 0 below 16
 505                 do (setf (aref block index) #x00000000)))
 506         ;; Add 64bit message bit length
 507         (setf (aref block 14) (ldb (byte 32 0) total-length))
 508         #-md5-small-length
 509         (setf (aref block 15) (ldb (byte 32 32) total-length))
 510         ;; Flush last block
 511         (update-md5-block regs block)
 512         ;; Done, remember digest for later calls
 513         (setf (md5-state-finalized-p state)
 514               (md5regs-digest regs)))))
 515
 516 ;;; High-Level Drivers
 517
 518 (defun md5sum-sequence (sequence &key (start 0) end)
 519   "Calculate the MD5 message-digest of data in sequence.  On CMU CL
 520 this works for all sequences whose element-type is supported by the
 521 underlying MD5 routines, on other implementations it only works for 1d
 522 simple-arrays with such element types."
 523   (declare (optimize (speed 3) (space 0) (debug 0))
 524            (type vector sequence) (type fixnum start))
 525   (let ((state (make-md5-state)))
 526     (declare (type md5-state state))
 527     #+cmu
 528     (lisp::with-array-data ((data sequence) (real-start start) (real-end end))
 529       (update-md5-state state data :start real-start :end real-end))
 530     #+sbcl
 531     (sb-kernel:with-array-data ((data sequence) (real-start start) (real-end end))
 532       (update-md5-state state data :start real-start :end real-end))
 533     #-(or cmu sbcl)
 534     (let ((real-end (or end (length sequence))))
 535       (declare (type fixnum real-end))
 536       (update-md5-state state sequence :start start :end real-end))
 537     (finalize-md5-state state)))
 538
 539 (defconstant +buffer-size+ (* 128 1024)
 540   "Size of internal buffer to use for md5sum-stream and md5sum-file
 541 operations.  This should be a multiple of 64, the MD5 block size.")
 542
 543 (deftype buffer-index () `(integer 0 ,+buffer-size+))
 544
 545 (defun md5sum-stream (stream)
 546   "Calculate an MD5 message-digest of the contents of stream.  Its
 547 element-type has to be either (unsigned-byte 8) or character."
 548   (declare (optimize (speed 3) (space 0) (debug 0)))
 549   (let ((state (make-md5-state)))
 550     (declare (type md5-state state))
 551     (cond
 552       ((equal (stream-element-type stream) '(unsigned-byte 8))
 553        (let ((buffer (make-array +buffer-size+
 554                                  :element-type '(unsigned-byte 8))))
 555          (declare (type (simple-array (unsigned-byte 8) (#.+buffer-size+))
 556                         buffer))
 557          (loop for bytes of-type buffer-index = (read-sequence buffer stream)
 558                do (update-md5-state state buffer :end bytes)
 559                until (< bytes +buffer-size+)
 560                finally
 561                (return (finalize-md5-state state)))))
 562       ((equal (stream-element-type stream) 'character)
 563        (let ((buffer (make-string +buffer-size+)))
 564          (declare (type (simple-string #.+buffer-size+) buffer))
 565          (loop for bytes of-type buffer-index = (read-sequence buffer stream)
 566                do (update-md5-state state buffer :end bytes)
 567                until (< bytes +buffer-size+)
 568                finally
 569                (return (finalize-md5-state state)))))
 570       (t
 571        (error "Unsupported stream element-type ~S for stream ~S."
 572               (stream-element-type stream) stream)))))
 573
 574 (defun md5sum-file (pathname)
 575   "Calculate the MD5 message-digest of the file specified by pathname."
 576   (declare (optimize (speed 3) (space 0) (debug 0)))
 577   (with-open-file (stream pathname :element-type '(unsigned-byte 8))
 578     (md5sum-stream stream)))
 579
 580 #+cmu
 581 (eval-when (:compile-toplevel :execute)
 582   (setq *features* *old-features*))
 583
 584 #+cmu
 585 (eval-when (:compile-toplevel)
 586   (setq ext:*inline-expansion-limit* *old-expansion-limit*))
 587
 588 #+sbcl
 589 (eval-when (:compile-toplevel)
 590   (setq *features* *old-features*))