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 && 192 EVP_MD_type((const EVP_MD *)p2) != NID_sha256 && 193 EVP_MD_type((const EVP_MD *)p2) != NID_sha384 && 194 EVP_MD_type((const EVP_MD *)p2) != NID_sha512) 195 { 196 DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE); 197 return 0; 198 } 199 dctx->md = p2; 200 return 1; 201 202 case EVP_PKEY_CTRL_DIGESTINIT: 203 case EVP_PKEY_CTRL_PKCS7_SIGN: 204 case EVP_PKEY_CTRL_CMS_SIGN: 205 return 1; 206 207 case EVP_PKEY_CTRL_PEER_KEY: 208 DSAerr(DSA_F_PKEY_DSA_CTRL, 209 EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE); 210 return -2; 211 default: 212 return -2; 213 214 } 215 } 216 217 static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx, 218 const char *type, const char *value) 219 { 220 if (!strcmp(type, "dsa_paramgen_bits")) 221 { 222 int nbits; 223 nbits = atoi(value); 224 return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits); 225 } 226 if (!strcmp(type, "dsa_paramgen_q_bits")) 227 { 228 int qbits = atoi(value); 229 return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN, 230 EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits, NULL); 231 } 232 if (!strcmp(type, "dsa_paramgen_md")) 233 { 234 return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN, 235 EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0, 236 (void *)EVP_get_digestbyname(value)); 237 } 238 return -2; 239 } 240 241 static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) 242 { 243 DSA *dsa = NULL; 244 DSA_PKEY_CTX *dctx = ctx->data; 245 BN_GENCB *pcb, cb; 246 int ret; 247 if (ctx->pkey_gencb) 248 { 249 pcb = &cb; 250 evp_pkey_set_cb_translate(pcb, ctx); 251 } 252 else 253 pcb = NULL; 254 dsa = DSA_new(); 255 if (!dsa) 256 return 0; 257 ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd, 258 NULL, 0, NULL, NULL, NULL, pcb); 259 if (ret) 260 EVP_PKEY_assign_DSA(pkey, dsa); 261 else 262 DSA_free(dsa); 263 return ret; 264 } 265 266 static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) 267 { 268 DSA *dsa = NULL; 269 if (ctx->pkey == NULL) 270 { 271 DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET); 272 return 0; 273 } 274 dsa = DSA_new(); 275 if (!dsa) 276 return 0; 277 EVP_PKEY_assign_DSA(pkey, dsa); 278 /* Note: if error return, pkey is freed by parent routine */ 279 if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey)) 280 return 0; 281 return DSA_generate_key(pkey->pkey.dsa); 282 } 283 284 const EVP_PKEY_METHOD dsa_pkey_meth = 285 { 286 EVP_PKEY_DSA, 287 EVP_PKEY_FLAG_AUTOARGLEN, 288 pkey_dsa_init, 289 pkey_dsa_copy, 290 pkey_dsa_cleanup, 291 292 0, 293 pkey_dsa_paramgen, 294 295 0, 296 pkey_dsa_keygen, 297 298 0, 299 pkey_dsa_sign, 300 301 0, 302 pkey_dsa_verify, 303 304 0,0, 305 306 0,0,0,0, 307 308 0,0, 309 310 0,0, 311 312 0,0, 313 314 pkey_dsa_ctrl, 315 pkey_dsa_ctrl_str 316 317 318 }; 319