crypto/libressl/crypto/pem/pem_seal.c

   1 /* $OpenBSD: pem_seal.c,v 1.21 2014/10/18 17:20:40 jsing Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <string.h>
  61
  62 #include <openssl/opensslconf.h>        /* for OPENSSL_NO_RSA */
  63
  64 #ifndef OPENSSL_NO_RSA
  65
  66 #include <openssl/err.h>
  67 #include <openssl/evp.h>
  68 #include <openssl/objects.h>
  69 #include <openssl/pem.h>
  70 #include <openssl/rsa.h>
  71 #include <openssl/x509.h>
  72
  73 int
  74 PEM_SealInit(PEM_ENCODE_SEAL_CTX *ctx, EVP_CIPHER *type, EVP_MD *md_type,
  75     unsigned char **ek, int *ekl, unsigned char *iv, EVP_PKEY **pubk, int npubk)
  76 {
  77         unsigned char key[EVP_MAX_KEY_LENGTH];
  78         int ret = -1;
  79         int i, j, max = 0;
  80         char *s = NULL;
  81
  82         for (i = 0; i < npubk; i++) {
  83                 if (pubk[i]->type != EVP_PKEY_RSA) {
  84                         PEMerr(PEM_F_PEM_SEALINIT, PEM_R_PUBLIC_KEY_NO_RSA);
  85                         goto err;
  86                 }
  87                 j = RSA_size(pubk[i]->pkey.rsa);
  88                 if (j > max)
  89                         max = j;
  90         }
  91         s = reallocarray(NULL, max, 2);
  92         if (s == NULL) {
  93                 PEMerr(PEM_F_PEM_SEALINIT, ERR_R_MALLOC_FAILURE);
  94                 goto err;
  95         }
  96
  97         EVP_EncodeInit(&ctx->encode);
  98
  99         EVP_MD_CTX_init(&ctx->md);
 100         if (!EVP_SignInit(&ctx->md, md_type))
 101                 goto err;
 102
 103         EVP_CIPHER_CTX_init(&ctx->cipher);
 104         ret = EVP_SealInit(&ctx->cipher, type, ek, ekl, iv, pubk, npubk);
 105         if (ret <= 0)
 106                 goto err;
 107
 108         /* base64 encode the keys */
 109         for (i = 0; i < npubk; i++) {
 110                 j = EVP_EncodeBlock((unsigned char *)s, ek[i],
 111                     RSA_size(pubk[i]->pkey.rsa));
 112                 ekl[i] = j;
 113                 memcpy(ek[i], s, j + 1);
 114         }
 115
 116         ret = npubk;
 117
 118 err:
 119         free(s);
 120         explicit_bzero(key, EVP_MAX_KEY_LENGTH);
 121         return (ret);
 122 }
 123
 124 void
 125 PEM_SealUpdate(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *out, int *outl,
 126     unsigned char *in, int inl)
 127 {
 128         unsigned char buffer[1600];
 129         int i, j;
 130
 131         *outl = 0;
 132         EVP_SignUpdate(&ctx->md, in, inl);
 133         for (;;) {
 134                 if (inl <= 0)
 135                         break;
 136                 if (inl > 1200)
 137                         i = 1200;
 138                 else
 139                         i = inl;
 140                 EVP_EncryptUpdate(&ctx->cipher, buffer, &j, in, i);
 141                 EVP_EncodeUpdate(&ctx->encode, out, &j, buffer, j);
 142                 *outl += j;
 143                 out += j;
 144                 in += i;
 145                 inl -= i;
 146         }
 147 }
 148
 149 int
 150 PEM_SealFinal(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *sig, int *sigl,
 151     unsigned char *out, int *outl, EVP_PKEY *priv)
 152 {
 153         unsigned char *s = NULL;
 154         int ret = 0, j;
 155         unsigned int i;
 156
 157         if (priv->type != EVP_PKEY_RSA) {
 158                 PEMerr(PEM_F_PEM_SEALFINAL, PEM_R_PUBLIC_KEY_NO_RSA);
 159                 goto err;
 160         }
 161         i = RSA_size(priv->pkey.rsa);
 162         if (i < 100)
 163                 i = 100;
 164         s = reallocarray(NULL, i, 2);
 165         if (s == NULL) {
 166                 PEMerr(PEM_F_PEM_SEALFINAL, ERR_R_MALLOC_FAILURE);
 167                 goto err;
 168         }
 169
 170         if (!EVP_EncryptFinal_ex(&ctx->cipher, s, (int *)&i))
 171                 goto err;
 172         EVP_EncodeUpdate(&ctx->encode, out, &j, s, i);
 173         *outl = j;
 174         out += j;
 175         EVP_EncodeFinal(&ctx->encode, out, &j);
 176         *outl += j;
 177
 178         if (!EVP_SignFinal(&ctx->md, s, &i, priv))
 179                 goto err;
 180         *sigl = EVP_EncodeBlock(sig, s, i);
 181
 182         ret = 1;
 183
 184 err:
 185         EVP_MD_CTX_cleanup(&ctx->md);
 186         EVP_CIPHER_CTX_cleanup(&ctx->cipher);
 187         free(s);
 188         return (ret);
 189 }
 190 #endif