Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| 2 | * project 2006. |
| 3 | */ |
| 4 | /* ==================================================================== |
| 5 | * Copyright (c) 2006,2007 The OpenSSL Project. All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in |
| 16 | * the documentation and/or other materials provided with the |
| 17 | * distribution. |
| 18 | * |
| 19 | * 3. All advertising materials mentioning features or use of this |
| 20 | * software must display the following acknowledgment: |
| 21 | * "This product includes software developed by the OpenSSL Project |
| 22 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| 23 | * |
| 24 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 25 | * endorse or promote products derived from this software without |
| 26 | * prior written permission. For written permission, please contact |
| 27 | * licensing@OpenSSL.org. |
| 28 | * |
| 29 | * 5. Products derived from this software may not be called "OpenSSL" |
| 30 | * nor may "OpenSSL" appear in their names without prior written |
| 31 | * permission of the OpenSSL Project. |
| 32 | * |
| 33 | * 6. Redistributions of any form whatsoever must retain the following |
| 34 | * acknowledgment: |
| 35 | * "This product includes software developed by the OpenSSL Project |
| 36 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| 37 | * |
| 38 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 39 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 40 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 41 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 42 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 43 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 44 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 45 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 46 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 47 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 48 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 49 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 50 | * ==================================================================== |
| 51 | * |
| 52 | * This product includes cryptographic software written by Eric Young |
| 53 | * (eay@cryptsoft.com). This product includes software written by Tim |
| 54 | * Hudson (tjh@cryptsoft.com). */ |
| 55 | |
| 56 | #include <openssl/evp.h> |
| 57 | |
| 58 | #include <openssl/digest.h> |
| 59 | #include <openssl/err.h> |
| 60 | |
| 61 | #include "internal.h" |
| 62 | #include "../digest/internal.h" |
| 63 | |
| 64 | |
| 65 | /* md_begin_digset is a callback from the |EVP_MD_CTX| code that is called when |
| 66 | * a new digest is begun. */ |
| 67 | static int md_begin_digest(EVP_MD_CTX *ctx) { |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame^] | 68 | return EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG, |
| 69 | EVP_PKEY_CTRL_DIGESTINIT, 0, ctx); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | static const struct evp_md_pctx_ops md_pctx_ops = { |
| 73 | EVP_PKEY_CTX_free, |
| 74 | EVP_PKEY_CTX_dup, |
| 75 | md_begin_digest, |
| 76 | }; |
| 77 | |
| 78 | static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, |
| 79 | const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey, |
| 80 | int is_verify) { |
| 81 | if (ctx->pctx == NULL) { |
| 82 | ctx->pctx = EVP_PKEY_CTX_new(pkey, e); |
| 83 | } |
| 84 | if (ctx->pctx == NULL) { |
| 85 | return 0; |
| 86 | } |
| 87 | ctx->pctx_ops = &md_pctx_ops; |
| 88 | |
| 89 | if (type == NULL) { |
| 90 | type = EVP_sha1(); |
| 91 | } |
| 92 | |
| 93 | if (type == NULL) { |
| 94 | OPENSSL_PUT_ERROR(EVP, do_sigver_init, EVP_R_NO_DEFAULT_DIGEST); |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | if (is_verify) { |
| 99 | if (ctx->pctx->pmeth->verifyctx_init) { |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame^] | 100 | if (!ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx)) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 101 | return 0; |
| 102 | } |
| 103 | ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX; |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame^] | 104 | } else if (!EVP_PKEY_verify_init(ctx->pctx)) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 105 | return 0; |
| 106 | } |
| 107 | } else { |
| 108 | if (ctx->pctx->pmeth->signctx_init) { |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame^] | 109 | if (!ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx)) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 110 | return 0; |
| 111 | } |
| 112 | ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX; |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame^] | 113 | } else if (!EVP_PKEY_sign_init(ctx->pctx)) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 114 | return 0; |
| 115 | } |
| 116 | } |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame^] | 117 | if (!EVP_PKEY_CTX_set_signature_md(ctx->pctx, type)) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 118 | return 0; |
| 119 | } |
| 120 | if (pctx) { |
| 121 | *pctx = ctx->pctx; |
| 122 | } |
| 123 | if (!EVP_DigestInit_ex(ctx, type, e)) { |
| 124 | return 0; |
| 125 | } |
| 126 | return 1; |
| 127 | } |
| 128 | |
| 129 | int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type, |
| 130 | ENGINE *e, EVP_PKEY *pkey) { |
| 131 | return do_sigver_init(ctx, pctx, type, e, pkey, 0); |
| 132 | } |
| 133 | |
| 134 | int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, |
| 135 | const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) { |
| 136 | return do_sigver_init(ctx, pctx, type, e, pkey, 1); |
| 137 | } |
| 138 | |
| 139 | int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) { |
| 140 | return EVP_DigestUpdate(ctx, data, len); |
| 141 | } |
| 142 | |
| 143 | int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) { |
| 144 | return EVP_DigestUpdate(ctx, data, len); |
| 145 | } |
| 146 | |
| 147 | int EVP_DigestSignFinal(EVP_MD_CTX *ctx, uint8_t *out_sig, |
| 148 | size_t *out_sig_len) { |
| 149 | int r = 0; |
| 150 | const int has_signctx = ctx->pctx->pmeth->signctx != NULL; |
| 151 | |
| 152 | if (out_sig) { |
| 153 | EVP_MD_CTX tmp_ctx; |
| 154 | uint8_t md[EVP_MAX_MD_SIZE]; |
| 155 | unsigned int mdlen; |
| 156 | |
| 157 | EVP_MD_CTX_init(&tmp_ctx); |
| 158 | if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) { |
| 159 | return 0; |
| 160 | } |
| 161 | if (has_signctx) { |
| 162 | r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx, out_sig, out_sig_len, &tmp_ctx); |
| 163 | } else { |
| 164 | r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen); |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame^] | 165 | if (r) { |
| 166 | r = EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, md, mdlen); |
| 167 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 168 | } |
| 169 | EVP_MD_CTX_cleanup(&tmp_ctx); |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame^] | 170 | return r; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 171 | } else { |
| 172 | if (has_signctx) { |
| 173 | return ctx->pctx->pmeth->signctx(ctx->pctx, out_sig, out_sig_len, ctx); |
| 174 | } else { |
| 175 | size_t s = EVP_MD_size(ctx->digest); |
| 176 | return EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, NULL, s); |
| 177 | } |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig, |
| 182 | size_t sig_len) { |
| 183 | EVP_MD_CTX tmp_ctx; |
| 184 | uint8_t md[EVP_MAX_MD_SIZE]; |
| 185 | int r; |
| 186 | unsigned int mdlen; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 187 | |
| 188 | EVP_MD_CTX_init(&tmp_ctx); |
| 189 | if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) { |
| 190 | return 0; |
| 191 | } |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame^] | 192 | if (ctx->pctx->pmeth->verifyctx) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 193 | r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx, sig, sig_len, &tmp_ctx); |
| 194 | } else { |
| 195 | r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen); |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame^] | 196 | if (r) { |
| 197 | r = EVP_PKEY_verify(ctx->pctx, sig, sig_len, md, mdlen); |
| 198 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 199 | } |
| 200 | |
| 201 | EVP_MD_CTX_cleanup(&tmp_ctx); |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame^] | 202 | |
| 203 | return r; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 204 | } |