Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* m_sigver.c */ |
| 2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| 3 | * project 2006. |
| 4 | */ |
| 5 | /* ==================================================================== |
| 6 | * Copyright (c) 2006,2007 The OpenSSL Project. All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in |
| 17 | * the documentation and/or other materials provided with the |
| 18 | * distribution. |
| 19 | * |
| 20 | * 3. All advertising materials mentioning features or use of this |
| 21 | * software must display the following acknowledgment: |
| 22 | * "This product includes software developed by the OpenSSL Project |
| 23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| 24 | * |
| 25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 26 | * endorse or promote products derived from this software without |
| 27 | * prior written permission. For written permission, please contact |
| 28 | * licensing@OpenSSL.org. |
| 29 | * |
| 30 | * 5. Products derived from this software may not be called "OpenSSL" |
| 31 | * nor may "OpenSSL" appear in their names without prior written |
| 32 | * permission of the OpenSSL Project. |
| 33 | * |
| 34 | * 6. Redistributions of any form whatsoever must retain the following |
| 35 | * acknowledgment: |
| 36 | * "This product includes software developed by the OpenSSL Project |
| 37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| 38 | * |
| 39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 50 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 51 | * ==================================================================== |
| 52 | * |
| 53 | * This product includes cryptographic software written by Eric Young |
| 54 | * (eay@cryptsoft.com). This product includes software written by Tim |
| 55 | * Hudson (tjh@cryptsoft.com). |
| 56 | * |
| 57 | */ |
| 58 | |
| 59 | #include <stdio.h> |
| 60 | #include "cryptlib.h" |
| 61 | #include <openssl/evp.h> |
| 62 | #include <openssl/objects.h> |
| 63 | #include <openssl/x509.h> |
| 64 | #include "evp_locl.h" |
| 65 | |
| 66 | static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, |
| 67 | const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey, |
| 68 | int ver) |
| 69 | { |
| 70 | if (ctx->pctx == NULL) |
| 71 | ctx->pctx = EVP_PKEY_CTX_new(pkey, e); |
| 72 | if (ctx->pctx == NULL) |
| 73 | return 0; |
| 74 | |
| 75 | if (type == NULL) |
| 76 | { |
| 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 | { |
| 84 | EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST); |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | if (ver) |
| 89 | { |
| 90 | if (ctx->pctx->pmeth->verifyctx_init) |
| 91 | { |
| 92 | if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <=0) |
| 93 | return 0; |
| 94 | ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX; |
| 95 | } |
| 96 | else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) |
| 97 | return 0; |
| 98 | } |
| 99 | else |
| 100 | { |
| 101 | if (ctx->pctx->pmeth->signctx_init) |
| 102 | { |
| 103 | if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0) |
| 104 | return 0; |
| 105 | ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX; |
| 106 | } |
| 107 | else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) |
| 108 | return 0; |
| 109 | } |
| 110 | if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0) |
| 111 | return 0; |
| 112 | if (pctx) |
| 113 | *pctx = ctx->pctx; |
| 114 | if (!EVP_DigestInit_ex(ctx, type, e)) |
| 115 | return 0; |
| 116 | return 1; |
| 117 | } |
| 118 | |
| 119 | int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, |
| 120 | const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) |
| 121 | { |
| 122 | return do_sigver_init(ctx, pctx, type, e, pkey, 0); |
| 123 | } |
| 124 | |
| 125 | int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, |
| 126 | const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) |
| 127 | { |
| 128 | return do_sigver_init(ctx, pctx, type, e, pkey, 1); |
| 129 | } |
| 130 | |
| 131 | int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen) |
| 132 | { |
| 133 | int sctx, r = 0; |
| 134 | if (ctx->pctx->pmeth->signctx) |
| 135 | sctx = 1; |
| 136 | else |
| 137 | sctx = 0; |
| 138 | if (sigret) |
| 139 | { |
| 140 | EVP_MD_CTX tmp_ctx; |
| 141 | unsigned char md[EVP_MAX_MD_SIZE]; |
| 142 | unsigned int mdlen; |
| 143 | EVP_MD_CTX_init(&tmp_ctx); |
| 144 | if (!EVP_MD_CTX_copy_ex(&tmp_ctx,ctx)) |
| 145 | return 0; |
| 146 | if (sctx) |
| 147 | r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx, |
| 148 | sigret, siglen, &tmp_ctx); |
| 149 | else |
| 150 | r = EVP_DigestFinal_ex(&tmp_ctx,md,&mdlen); |
| 151 | EVP_MD_CTX_cleanup(&tmp_ctx); |
| 152 | if (sctx || !r) |
| 153 | return r; |
| 154 | if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0) |
| 155 | return 0; |
| 156 | } |
| 157 | else |
| 158 | { |
| 159 | if (sctx) |
| 160 | { |
| 161 | if (ctx->pctx->pmeth->signctx(ctx->pctx, sigret, siglen, ctx) <= 0) |
| 162 | return 0; |
| 163 | } |
| 164 | else |
| 165 | { |
| 166 | int s = EVP_MD_size(ctx->digest); |
| 167 | if (s < 0 || EVP_PKEY_sign(ctx->pctx, sigret, siglen, NULL, s) <= 0) |
| 168 | return 0; |
| 169 | } |
| 170 | } |
| 171 | return 1; |
| 172 | } |
| 173 | |
| 174 | int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, unsigned char *sig, size_t siglen) |
| 175 | { |
| 176 | EVP_MD_CTX tmp_ctx; |
| 177 | unsigned char md[EVP_MAX_MD_SIZE]; |
| 178 | int r; |
| 179 | unsigned int mdlen; |
| 180 | int vctx; |
| 181 | |
| 182 | if (ctx->pctx->pmeth->verifyctx) |
| 183 | vctx = 1; |
| 184 | else |
| 185 | vctx = 0; |
| 186 | EVP_MD_CTX_init(&tmp_ctx); |
| 187 | if (!EVP_MD_CTX_copy_ex(&tmp_ctx,ctx)) |
| 188 | return -1; |
| 189 | if (vctx) |
| 190 | { |
| 191 | r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx, |
| 192 | sig, siglen, &tmp_ctx); |
| 193 | } |
| 194 | else |
| 195 | r = EVP_DigestFinal_ex(&tmp_ctx,md,&mdlen); |
| 196 | EVP_MD_CTX_cleanup(&tmp_ctx); |
| 197 | if (vctx || !r) |
| 198 | return r; |
| 199 | return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen); |
| 200 | } |