pem_seal.c revision 280304
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 70int 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 = (char *)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 121void 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 EVP_SignUpdate(&ctx->md, in, inl); 129 for (;;) { 130 if (inl <= 0) 131 break; 132 if (inl > 1200) 133 i = 1200; 134 else 135 i = inl; 136 EVP_EncryptUpdate(&ctx->cipher, buffer, &j, in, i); 137 EVP_EncodeUpdate(&ctx->encode, out, &j, buffer, j); 138 *outl += j; 139 out += j; 140 in += i; 141 inl -= i; 142 } 143} 144 145int PEM_SealFinal(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *sig, int *sigl, 146 unsigned char *out, int *outl, EVP_PKEY *priv) 147{ 148 unsigned char *s = NULL; 149 int ret = 0, j; 150 unsigned int i; 151 152 if (priv->type != EVP_PKEY_RSA) { 153 PEMerr(PEM_F_PEM_SEALFINAL, PEM_R_PUBLIC_KEY_NO_RSA); 154 goto err; 155 } 156 i = RSA_size(priv->pkey.rsa); 157 if (i < 100) 158 i = 100; 159 s = (unsigned char *)OPENSSL_malloc(i * 2); 160 if (s == NULL) { 161 PEMerr(PEM_F_PEM_SEALFINAL, ERR_R_MALLOC_FAILURE); 162 goto err; 163 } 164 165 if (!EVP_EncryptFinal_ex(&ctx->cipher, s, (int *)&i)) 166 goto err; 167 EVP_EncodeUpdate(&ctx->encode, out, &j, s, i); 168 *outl = j; 169 out += j; 170 EVP_EncodeFinal(&ctx->encode, out, &j); 171 *outl += j; 172 173 if (!EVP_SignFinal(&ctx->md, s, &i, priv)) 174 goto err; 175 *sigl = EVP_EncodeBlock(sig, s, i); 176 177 ret = 1; 178 err: 179 EVP_MD_CTX_cleanup(&ctx->md); 180 EVP_CIPHER_CTX_cleanup(&ctx->cipher); 181 if (s != NULL) 182 OPENSSL_free(s); 183 return (ret); 184} 185#else /* !OPENSSL_NO_RSA */ 186 187# if PEDANTIC 188static void *dummy = &dummy; 189# endif 190 191#endif 192