m_sigver.c revision 280304
1/* m_sigver.c */ 2/* 3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project 4 * 2006. 5 */ 6/* ==================================================================== 7 * Copyright (c) 2006,2007 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * licensing@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59 60#include <stdio.h> 61#include "cryptlib.h" 62#include <openssl/evp.h> 63#include <openssl/objects.h> 64#include <openssl/x509.h> 65#include "evp_locl.h" 66 67static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 68 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey, 69 int ver) 70{ 71 if (ctx->pctx == NULL) 72 ctx->pctx = EVP_PKEY_CTX_new(pkey, e); 73 if (ctx->pctx == NULL) 74 return 0; 75 76 if (type == NULL) { 77 int def_nid; 78 if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0) 79 type = EVP_get_digestbynid(def_nid); 80 } 81 82 if (type == NULL) { 83 EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST); 84 return 0; 85 } 86 87 if (ver) { 88 if (ctx->pctx->pmeth->verifyctx_init) { 89 if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0) 90 return 0; 91 ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX; 92 } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) 93 return 0; 94 } else { 95 if (ctx->pctx->pmeth->signctx_init) { 96 if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0) 97 return 0; 98 ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX; 99 } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) 100 return 0; 101 } 102 if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0) 103 return 0; 104 if (pctx) 105 *pctx = ctx->pctx; 106 if (!EVP_DigestInit_ex(ctx, type, e)) 107 return 0; 108 return 1; 109} 110 111int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 112 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) 113{ 114 return do_sigver_init(ctx, pctx, type, e, pkey, 0); 115} 116 117int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 118 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) 119{ 120 return do_sigver_init(ctx, pctx, type, e, pkey, 1); 121} 122 123int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, 124 size_t *siglen) 125{ 126 int sctx, r = 0; 127 if (ctx->pctx->pmeth->signctx) 128 sctx = 1; 129 else 130 sctx = 0; 131 if (sigret) { 132 EVP_MD_CTX tmp_ctx; 133 unsigned char md[EVP_MAX_MD_SIZE]; 134 unsigned int mdlen; 135 EVP_MD_CTX_init(&tmp_ctx); 136 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) 137 return 0; 138 if (sctx) 139 r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx, 140 sigret, siglen, &tmp_ctx); 141 else 142 r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen); 143 EVP_MD_CTX_cleanup(&tmp_ctx); 144 if (sctx || !r) 145 return r; 146 if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0) 147 return 0; 148 } else { 149 if (sctx) { 150 if (ctx->pctx->pmeth->signctx(ctx->pctx, sigret, siglen, ctx) <= 151 0) 152 return 0; 153 } else { 154 int s = EVP_MD_size(ctx->digest); 155 if (s < 0 156 || EVP_PKEY_sign(ctx->pctx, sigret, siglen, NULL, s) <= 0) 157 return 0; 158 } 159 } 160 return 1; 161} 162 163int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, unsigned char *sig, size_t siglen) 164{ 165 EVP_MD_CTX tmp_ctx; 166 unsigned char md[EVP_MAX_MD_SIZE]; 167 int r; 168 unsigned int mdlen; 169 int vctx; 170 171 if (ctx->pctx->pmeth->verifyctx) 172 vctx = 1; 173 else 174 vctx = 0; 175 EVP_MD_CTX_init(&tmp_ctx); 176 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) 177 return -1; 178 if (vctx) { 179 r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx, 180 sig, siglen, &tmp_ctx); 181 } else 182 r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen); 183 EVP_MD_CTX_cleanup(&tmp_ctx); 184 if (vctx || !r) 185 return r; 186 return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen); 187} 188