Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| 2 | * project 2006. |
| 3 | */ |
| 4 | /* ==================================================================== |
| 5 | * Copyright (c) 2006 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 | */ |
| 57 | |
| 58 | #include <stdio.h> |
| 59 | #include "cryptlib.h" |
| 60 | #include <openssl/asn1t.h> |
| 61 | #include <openssl/x509.h> |
| 62 | #include <openssl/evp.h> |
| 63 | #include <openssl/bn.h> |
| 64 | #include "evp_locl.h" |
| 65 | #include "dsa_locl.h" |
| 66 | |
| 67 | /* DSA pkey context structure */ |
| 68 | |
| 69 | typedef struct |
| 70 | { |
| 71 | /* Parameter gen parameters */ |
| 72 | int nbits; /* size of p in bits (default: 1024) */ |
| 73 | int qbits; /* size of q in bits (default: 160) */ |
| 74 | const EVP_MD *pmd; /* MD for parameter generation */ |
| 75 | /* Keygen callback info */ |
| 76 | int gentmp[2]; |
| 77 | /* message digest */ |
| 78 | const EVP_MD *md; /* MD for the signature */ |
| 79 | } DSA_PKEY_CTX; |
| 80 | |
| 81 | static int pkey_dsa_init(EVP_PKEY_CTX *ctx) |
| 82 | { |
| 83 | DSA_PKEY_CTX *dctx; |
| 84 | dctx = OPENSSL_malloc(sizeof(DSA_PKEY_CTX)); |
| 85 | if (!dctx) |
| 86 | return 0; |
| 87 | dctx->nbits = 1024; |
| 88 | dctx->qbits = 160; |
| 89 | dctx->pmd = NULL; |
| 90 | dctx->md = NULL; |
| 91 | |
| 92 | ctx->data = dctx; |
| 93 | ctx->keygen_info = dctx->gentmp; |
| 94 | ctx->keygen_info_count = 2; |
| 95 | |
| 96 | return 1; |
| 97 | } |
| 98 | |
| 99 | static int pkey_dsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) |
| 100 | { |
| 101 | DSA_PKEY_CTX *dctx, *sctx; |
| 102 | if (!pkey_dsa_init(dst)) |
| 103 | return 0; |
| 104 | sctx = src->data; |
| 105 | dctx = dst->data; |
| 106 | dctx->nbits = sctx->nbits; |
| 107 | dctx->qbits = sctx->qbits; |
| 108 | dctx->pmd = sctx->pmd; |
| 109 | dctx->md = sctx->md; |
| 110 | return 1; |
| 111 | } |
| 112 | |
| 113 | static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx) |
| 114 | { |
| 115 | DSA_PKEY_CTX *dctx = ctx->data; |
| 116 | if (dctx) |
| 117 | OPENSSL_free(dctx); |
| 118 | } |
| 119 | |
| 120 | static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen, |
| 121 | const unsigned char *tbs, size_t tbslen) |
| 122 | { |
| 123 | int ret, type; |
| 124 | unsigned int sltmp; |
| 125 | DSA_PKEY_CTX *dctx = ctx->data; |
| 126 | DSA *dsa = ctx->pkey->pkey.dsa; |
| 127 | |
| 128 | if (dctx->md) |
| 129 | type = EVP_MD_type(dctx->md); |
| 130 | else |
| 131 | type = NID_sha1; |
| 132 | |
| 133 | ret = DSA_sign(type, tbs, tbslen, sig, &sltmp, dsa); |
| 134 | |
| 135 | if (ret <= 0) |
| 136 | return ret; |
| 137 | *siglen = sltmp; |
| 138 | return 1; |
| 139 | } |
| 140 | |
| 141 | static int pkey_dsa_verify(EVP_PKEY_CTX *ctx, |
| 142 | const unsigned char *sig, size_t siglen, |
| 143 | const unsigned char *tbs, size_t tbslen) |
| 144 | { |
| 145 | int ret, type; |
| 146 | DSA_PKEY_CTX *dctx = ctx->data; |
| 147 | DSA *dsa = ctx->pkey->pkey.dsa; |
| 148 | |
| 149 | if (dctx->md) |
| 150 | type = EVP_MD_type(dctx->md); |
| 151 | else |
| 152 | type = NID_sha1; |
| 153 | |
| 154 | ret = DSA_verify(type, tbs, tbslen, sig, siglen, dsa); |
| 155 | |
| 156 | return ret; |
| 157 | } |
| 158 | |
| 159 | static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) |
| 160 | { |
| 161 | DSA_PKEY_CTX *dctx = ctx->data; |
| 162 | switch (type) |
| 163 | { |
| 164 | case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS: |
| 165 | if (p1 < 256) |
| 166 | return -2; |
| 167 | dctx->nbits = p1; |
| 168 | return 1; |
| 169 | |
| 170 | case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS: |
| 171 | if (p1 != 160 && p1 != 224 && p1 && p1 != 256) |
| 172 | return -2; |
| 173 | dctx->qbits = p1; |
| 174 | return 1; |
| 175 | |
| 176 | case EVP_PKEY_CTRL_DSA_PARAMGEN_MD: |
| 177 | if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 && |
| 178 | EVP_MD_type((const EVP_MD *)p2) != NID_sha224 && |
| 179 | EVP_MD_type((const EVP_MD *)p2) != NID_sha256) |
| 180 | { |
| 181 | DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE); |
| 182 | return 0; |
| 183 | } |
| 184 | dctx->md = p2; |
| 185 | return 1; |
| 186 | |
| 187 | case EVP_PKEY_CTRL_MD: |
| 188 | if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 && |
| 189 | EVP_MD_type((const EVP_MD *)p2) != NID_dsa && |
| 190 | EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA && |
| 191 | EVP_MD_type((const EVP_MD *)p2) != NID_sha224 && |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 192 | EVP_MD_type((const EVP_MD *)p2) != NID_sha256) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 193 | { |
| 194 | DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE); |
| 195 | return 0; |
| 196 | } |
| 197 | dctx->md = p2; |
| 198 | return 1; |
| 199 | |
| 200 | case EVP_PKEY_CTRL_DIGESTINIT: |
| 201 | case EVP_PKEY_CTRL_PKCS7_SIGN: |
| 202 | case EVP_PKEY_CTRL_CMS_SIGN: |
| 203 | return 1; |
| 204 | |
| 205 | case EVP_PKEY_CTRL_PEER_KEY: |
| 206 | DSAerr(DSA_F_PKEY_DSA_CTRL, |
| 207 | EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE); |
| 208 | return -2; |
| 209 | default: |
| 210 | return -2; |
| 211 | |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx, |
| 216 | const char *type, const char *value) |
| 217 | { |
| 218 | if (!strcmp(type, "dsa_paramgen_bits")) |
| 219 | { |
| 220 | int nbits; |
| 221 | nbits = atoi(value); |
| 222 | return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits); |
| 223 | } |
| 224 | if (!strcmp(type, "dsa_paramgen_q_bits")) |
| 225 | { |
| 226 | int qbits = atoi(value); |
| 227 | return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN, |
| 228 | EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits, NULL); |
| 229 | } |
| 230 | if (!strcmp(type, "dsa_paramgen_md")) |
| 231 | { |
| 232 | return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN, |
| 233 | EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0, |
| 234 | (void *)EVP_get_digestbyname(value)); |
| 235 | } |
| 236 | return -2; |
| 237 | } |
| 238 | |
| 239 | static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) |
| 240 | { |
| 241 | DSA *dsa = NULL; |
| 242 | DSA_PKEY_CTX *dctx = ctx->data; |
| 243 | BN_GENCB *pcb, cb; |
| 244 | int ret; |
| 245 | if (ctx->pkey_gencb) |
| 246 | { |
| 247 | pcb = &cb; |
| 248 | evp_pkey_set_cb_translate(pcb, ctx); |
| 249 | } |
| 250 | else |
| 251 | pcb = NULL; |
| 252 | dsa = DSA_new(); |
| 253 | if (!dsa) |
| 254 | return 0; |
| 255 | ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd, |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 256 | NULL, 0, NULL, NULL, pcb); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 257 | if (ret) |
| 258 | EVP_PKEY_assign_DSA(pkey, dsa); |
| 259 | else |
| 260 | DSA_free(dsa); |
| 261 | return ret; |
| 262 | } |
| 263 | |
| 264 | static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) |
| 265 | { |
| 266 | DSA *dsa = NULL; |
| 267 | if (ctx->pkey == NULL) |
| 268 | { |
| 269 | DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET); |
| 270 | return 0; |
| 271 | } |
| 272 | dsa = DSA_new(); |
| 273 | if (!dsa) |
| 274 | return 0; |
| 275 | EVP_PKEY_assign_DSA(pkey, dsa); |
| 276 | /* Note: if error return, pkey is freed by parent routine */ |
| 277 | if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey)) |
| 278 | return 0; |
| 279 | return DSA_generate_key(pkey->pkey.dsa); |
| 280 | } |
| 281 | |
| 282 | const EVP_PKEY_METHOD dsa_pkey_meth = |
| 283 | { |
| 284 | EVP_PKEY_DSA, |
| 285 | EVP_PKEY_FLAG_AUTOARGLEN, |
| 286 | pkey_dsa_init, |
| 287 | pkey_dsa_copy, |
| 288 | pkey_dsa_cleanup, |
| 289 | |
| 290 | 0, |
| 291 | pkey_dsa_paramgen, |
| 292 | |
| 293 | 0, |
| 294 | pkey_dsa_keygen, |
| 295 | |
| 296 | 0, |
| 297 | pkey_dsa_sign, |
| 298 | |
| 299 | 0, |
| 300 | pkey_dsa_verify, |
| 301 | |
| 302 | 0,0, |
| 303 | |
| 304 | 0,0,0,0, |
| 305 | |
| 306 | 0,0, |
| 307 | |
| 308 | 0,0, |
| 309 | |
| 310 | 0,0, |
| 311 | |
| 312 | pkey_dsa_ctrl, |
| 313 | pkey_dsa_ctrl_str |
| 314 | |
| 315 | |
| 316 | }; |