crypto/pem/pem_seal.c

   1 /* crypto/pem/pem_seal.c */
   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 <openssl/opensslconf.h> /* for OPENSSL_NO_RSA */
  60 #ifndef OPENSSL_NO_RSA
  61 # include <stdio.h>
  62 # include "cryptlib.h"
  63 # include <openssl/evp.h>
  64 # include <openssl/rand.h>
  65 # include <openssl/objects.h>
  66 # include <openssl/x509.h>
  67 # include <openssl/pem.h>
  68 # include <openssl/rsa.h>
  69
  70 int PEM_SealInit(PEM_ENCODE_SEAL_CTX *ctx, EVP_CIPHER *type, EVP_MD *md_type,
  71                  unsigned char **ek, int *ekl, unsigned char *iv,
  72                  EVP_PKEY **pubk, int npubk)
  73 {
  74     unsigned char key[EVP_MAX_KEY_LENGTH];
  75     int ret = -1;
  76     int i, j, max = 0;
  77     char *s = NULL;
  78
  79     for (i = 0; i < npubk; i++) {
  80         if (pubk[i]->type != EVP_PKEY_RSA) {
  81             PEMerr(PEM_F_PEM_SEALINIT, PEM_R_PUBLIC_KEY_NO_RSA);
  82             goto err;
  83         }
  84         j = RSA_size(pubk[i]->pkey.rsa);
  85         if (j > max)
  86             max = j;
  87     }
  88     s = OPENSSL_malloc(max * 2);
  89     if (s == NULL) {
  90         PEMerr(PEM_F_PEM_SEALINIT, ERR_R_MALLOC_FAILURE);
  91         goto err;
  92     }
  93
  94     EVP_EncodeInit(&ctx->encode);
  95
  96     EVP_MD_CTX_init(&ctx->md);
  97     if (!EVP_SignInit(&ctx->md, md_type))
  98         goto err;
  99
 100     EVP_CIPHER_CTX_init(&ctx->cipher);
 101     ret = EVP_SealInit(&ctx->cipher, type, ek, ekl, iv, pubk, npubk);
 102     if (ret <= 0)
 103         goto err;
 104
 105     /* base64 encode the keys */
 106     for (i = 0; i < npubk; i++) {
 107         j = EVP_EncodeBlock((unsigned char *)s, ek[i],
 108                             RSA_size(pubk[i]->pkey.rsa));
 109         ekl[i] = j;
 110         memcpy(ek[i], s, j + 1);
 111     }
 112
 113     ret = npubk;
 114  err:
 115     if (s != NULL)
 116         OPENSSL_free(s);
 117     OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
 118     return (ret);
 119 }
 120
 121 int PEM_SealUpdate(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *out, int *outl,
 122                    unsigned char *in, int inl)
 123 {
 124     unsigned char buffer[1600];
 125     int i, j;
 126
 127     *outl = 0;
 128     if (!EVP_SignUpdate(&ctx->md, in, inl))
 129         return 0;
 130     for (;;) {
 131         if (inl <= 0)
 132             break;
 133         if (inl > 1200)
 134             i = 1200;
 135         else
 136             i = inl;
 137         if (!EVP_EncryptUpdate(&ctx->cipher, buffer, &j, in, i))
 138             return 0;
 139         EVP_EncodeUpdate(&ctx->encode, out, &j, buffer, j);
 140         *outl += j;
 141         out += j;
 142         in += i;
 143         inl -= i;
 144     }
 145     return 1;
 146 }
 147
 148 int PEM_SealFinal(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *sig, int *sigl,
 149                   unsigned char *out, int *outl, EVP_PKEY *priv)
 150 {
 151     unsigned char *s = NULL;
 152     int ret = 0, j;
 153     unsigned int i;
 154
 155     if (priv->type != EVP_PKEY_RSA) {
 156         PEMerr(PEM_F_PEM_SEALFINAL, PEM_R_PUBLIC_KEY_NO_RSA);
 157         goto err;
 158     }
 159     i = RSA_size(priv->pkey.rsa);
 160     if (i < 100)
 161         i = 100;
 162     s = OPENSSL_malloc(i * 2);
 163     if (s == NULL) {
 164         PEMerr(PEM_F_PEM_SEALFINAL, ERR_R_MALLOC_FAILURE);
 165         goto err;
 166     }
 167
 168     if (!EVP_EncryptFinal_ex(&ctx->cipher, s, (int *)&i))
 169         goto err;
 170     EVP_EncodeUpdate(&ctx->encode, out, &j, s, i);
 171     *outl = j;
 172     out += j;
 173     EVP_EncodeFinal(&ctx->encode, out, &j);
 174     *outl += j;
 175
 176     if (!EVP_SignFinal(&ctx->md, s, &i, priv))
 177         goto err;
 178     *sigl = EVP_EncodeBlock(sig, s, i);
 179
 180     ret = 1;
 181  err:
 182     EVP_MD_CTX_cleanup(&ctx->md);
 183     EVP_CIPHER_CTX_cleanup(&ctx->cipher);
 184     if (s != NULL)
 185         OPENSSL_free(s);
 186     return (ret);
 187 }
 188 #else                           /* !OPENSSL_NO_RSA */
 189
 190 # if PEDANTIC
 191 static void *dummy = &dummy;
 192 # endif
 193
 194 #endif