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| 1 /* | |
| 2 * Verification stuff. | |
| 3 * | |
| 4 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 5 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 6 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 7 | |
| 8 #include <stdio.h> | |
| 9 #include "cryptohi.h" | |
| 10 #include "sechash.h" | |
| 11 #include "keyhi.h" | |
| 12 #include "secasn1.h" | |
| 13 #include "secoid.h" | |
| 14 #include "pk11func.h" | |
| 15 #include "pkcs1sig.h" | |
| 16 #include "secdig.h" | |
| 17 #include "secerr.h" | |
| 18 #include "keyi.h" | |
| 19 | |
| 20 /* | |
| 21 ** Recover the DigestInfo from an RSA PKCS#1 signature. | |
| 22 ** | |
| 23 ** If givenDigestAlg != SEC_OID_UNKNOWN, copy givenDigestAlg to digestAlgOut. | |
| 24 ** Otherwise, parse the DigestInfo structure and store the decoded digest | |
| 25 ** algorithm into digestAlgOut. | |
| 26 ** | |
| 27 ** Store the encoded DigestInfo into digestInfo. | |
| 28 ** Store the DigestInfo length into digestInfoLen. | |
| 29 ** | |
| 30 ** This function does *not* verify that the AlgorithmIdentifier in the | |
| 31 ** DigestInfo identifies givenDigestAlg or that the DigestInfo is encoded | |
| 32 ** correctly; verifyPKCS1DigestInfo does that. | |
| 33 ** | |
| 34 ** XXX this is assuming that the signature algorithm has WITH_RSA_ENCRYPTION | |
| 35 */ | |
| 36 static SECStatus | |
| 37 recoverPKCS1DigestInfo(SECOidTag givenDigestAlg, | |
| 38 /*out*/ SECOidTag *digestAlgOut, | |
| 39 /*out*/ unsigned char **digestInfo, | |
| 40 /*out*/ unsigned int *digestInfoLen, | |
| 41 SECKEYPublicKey *key, | |
| 42 const SECItem *sig, void *wincx) | |
| 43 { | |
| 44 SGNDigestInfo *di = NULL; | |
| 45 SECItem it; | |
| 46 PRBool rv = SECSuccess; | |
| 47 | |
| 48 PORT_Assert(digestAlgOut); | |
| 49 PORT_Assert(digestInfo); | |
| 50 PORT_Assert(digestInfoLen); | |
| 51 PORT_Assert(key); | |
| 52 PORT_Assert(key->keyType == rsaKey); | |
| 53 PORT_Assert(sig); | |
| 54 | |
| 55 it.data = NULL; | |
| 56 it.len = SECKEY_PublicKeyStrength(key); | |
| 57 if (it.len != 0) { | |
| 58 it.data = (unsigned char *)PORT_Alloc(it.len); | |
| 59 } | |
| 60 if (it.len == 0 || it.data == NULL) { | |
| 61 rv = SECFailure; | |
| 62 } | |
| 63 | |
| 64 if (rv == SECSuccess) { | |
| 65 /* decrypt the block */ | |
| 66 rv = PK11_VerifyRecover(key, sig, &it, wincx); | |
| 67 } | |
| 68 | |
| 69 if (rv == SECSuccess) { | |
| 70 if (givenDigestAlg != SEC_OID_UNKNOWN) { | |
| 71 /* We don't need to parse the DigestInfo if the caller gave us the | |
| 72 * digest algorithm to use. Later verifyPKCS1DigestInfo will verify | |
| 73 * that the DigestInfo identifies the given digest algorithm and | |
| 74 * that the DigestInfo is encoded absolutely correctly. | |
| 75 */ | |
| 76 *digestInfoLen = it.len; | |
| 77 *digestInfo = (unsigned char *)it.data; | |
| 78 *digestAlgOut = givenDigestAlg; | |
| 79 return SECSuccess; | |
| 80 } | |
| 81 } | |
| 82 | |
| 83 if (rv == SECSuccess) { | |
| 84 /* The caller didn't specify a digest algorithm to use, so choose the | |
| 85 * digest algorithm by parsing the AlgorithmIdentifier within the | |
| 86 * DigestInfo. | |
| 87 */ | |
| 88 di = SGN_DecodeDigestInfo(&it); | |
| 89 if (!di) { | |
| 90 rv = SECFailure; | |
| 91 } | |
| 92 } | |
| 93 | |
| 94 if (rv == SECSuccess) { | |
| 95 *digestAlgOut = SECOID_GetAlgorithmTag(&di->digestAlgorithm); | |
| 96 if (*digestAlgOut == SEC_OID_UNKNOWN) { | |
| 97 rv = SECFailure; | |
| 98 } | |
| 99 } | |
| 100 | |
| 101 if (di) { | |
| 102 SGN_DestroyDigestInfo(di); | |
| 103 } | |
| 104 | |
| 105 if (rv == SECSuccess) { | |
| 106 *digestInfoLen = it.len; | |
| 107 *digestInfo = (unsigned char *)it.data; | |
| 108 } else { | |
| 109 if (it.data) { | |
| 110 PORT_Free(it.data); | |
| 111 } | |
| 112 *digestInfo = NULL; | |
| 113 *digestInfoLen = 0; | |
| 114 PORT_SetError(SEC_ERROR_BAD_SIGNATURE); | |
| 115 } | |
| 116 | |
| 117 return rv; | |
| 118 } | |
| 119 | |
| 120 struct VFYContextStr { | |
| 121 SECOidTag hashAlg; /* the hash algorithm */ | |
| 122 SECKEYPublicKey *key; | |
| 123 /* | |
| 124 * This buffer holds either the digest or the full signature | |
| 125 * depending on the type of the signature (key->keyType). It is | |
| 126 * defined as a union to make sure it always has enough space. | |
| 127 * | |
| 128 * Use the "buffer" union member to reference the buffer. | |
| 129 * Note: do not take the size of the "buffer" union member. Take | |
| 130 * the size of the union or some other union member instead. | |
| 131 */ | |
| 132 union { | |
| 133 unsigned char buffer[1]; | |
| 134 | |
| 135 /* the full DSA signature... 40 bytes */ | |
| 136 unsigned char dsasig[DSA_MAX_SIGNATURE_LEN]; | |
| 137 /* the full ECDSA signature */ | |
| 138 unsigned char ecdsasig[2 * MAX_ECKEY_LEN]; | |
| 139 } u; | |
| 140 unsigned int pkcs1RSADigestInfoLen; | |
| 141 /* the encoded DigestInfo from a RSA PKCS#1 signature */ | |
| 142 unsigned char *pkcs1RSADigestInfo; | |
| 143 void *wincx; | |
| 144 void *hashcx; | |
| 145 const SECHashObject *hashobj; | |
| 146 SECOidTag encAlg; /* enc alg */ | |
| 147 PRBool hasSignature; /* true if the signature was provided in the | |
| 148 * VFY_CreateContext call. If false, the | |
| 149 * signature must be provided with a | |
| 150 * VFY_EndWithSignature call. */ | |
| 151 }; | |
| 152 | |
| 153 static SECStatus | |
| 154 verifyPKCS1DigestInfo(const VFYContext *cx, const SECItem *digest) | |
| 155 { | |
| 156 SECItem pkcs1DigestInfo; | |
| 157 pkcs1DigestInfo.data = cx->pkcs1RSADigestInfo; | |
| 158 pkcs1DigestInfo.len = cx->pkcs1RSADigestInfoLen; | |
| 159 return _SGN_VerifyPKCS1DigestInfo( | |
| 160 cx->hashAlg, digest, &pkcs1DigestInfo, | |
| 161 PR_TRUE /*XXX: unsafeAllowMissingParameters*/); | |
| 162 } | |
| 163 | |
| 164 /* | |
| 165 * decode the ECDSA or DSA signature from it's DER wrapping. | |
| 166 * The unwrapped/raw signature is placed in the buffer pointed | |
| 167 * to by dsig and has enough room for len bytes. | |
| 168 */ | |
| 169 static SECStatus | |
| 170 decodeECorDSASignature(SECOidTag algid, const SECItem *sig, unsigned char *dsig, | |
| 171 unsigned int len) | |
| 172 { | |
| 173 SECItem *dsasig = NULL; /* also used for ECDSA */ | |
| 174 SECStatus rv = SECSuccess; | |
| 175 | |
| 176 if ((algid != SEC_OID_ANSIX9_DSA_SIGNATURE) && | |
| 177 (algid != SEC_OID_ANSIX962_EC_PUBLIC_KEY)) { | |
| 178 if (sig->len != len) { | |
| 179 PORT_SetError(SEC_ERROR_BAD_DER); | |
| 180 return SECFailure; | |
| 181 } | |
| 182 | |
| 183 PORT_Memcpy(dsig, sig->data, sig->len); | |
| 184 return SECSuccess; | |
| 185 } | |
| 186 | |
| 187 if (algid == SEC_OID_ANSIX962_EC_PUBLIC_KEY) { | |
| 188 if (len > MAX_ECKEY_LEN * 2) { | |
| 189 PORT_SetError(SEC_ERROR_BAD_DER); | |
| 190 return SECFailure; | |
| 191 } | |
| 192 } | |
| 193 dsasig = DSAU_DecodeDerSigToLen((SECItem *)sig, len); | |
| 194 | |
| 195 if ((dsasig == NULL) || (dsasig->len != len)) { | |
| 196 rv = SECFailure; | |
| 197 } else { | |
| 198 PORT_Memcpy(dsig, dsasig->data, dsasig->len); | |
| 199 } | |
| 200 | |
| 201 if (dsasig != NULL) | |
| 202 SECITEM_FreeItem(dsasig, PR_TRUE); | |
| 203 if (rv == SECFailure) | |
| 204 PORT_SetError(SEC_ERROR_BAD_DER); | |
| 205 return rv; | |
| 206 } | |
| 207 | |
| 208 const SEC_ASN1Template hashParameterTemplate[] = | |
| 209 { | |
| 210 { SEC_ASN1_SEQUENCE, 0, NULL, sizeof(SECItem) }, | |
| 211 { SEC_ASN1_OBJECT_ID, 0 }, | |
| 212 { SEC_ASN1_SKIP_REST }, | |
| 213 { 0 } | |
| 214 }; | |
| 215 | |
| 216 /* | |
| 217 * Pulls the hash algorithm, signing algorithm, and key type out of a | |
| 218 * composite algorithm. | |
| 219 * | |
| 220 * sigAlg: the composite algorithm to dissect. | |
| 221 * hashalg: address of a SECOidTag which will be set with the hash algorithm. | |
| 222 * encalg: address of a SECOidTag which will be set with the signing alg. | |
| 223 * | |
| 224 * Returns: SECSuccess if the algorithm was acceptable, SECFailure if the | |
| 225 * algorithm was not found or was not a signing algorithm. | |
| 226 */ | |
| 227 SECStatus | |
| 228 sec_DecodeSigAlg(const SECKEYPublicKey *key, SECOidTag sigAlg, | |
| 229 const SECItem *param, SECOidTag *encalg, SECOidTag *hashalg) | |
| 230 { | |
| 231 int len; | |
| 232 PLArenaPool *arena; | |
| 233 SECStatus rv; | |
| 234 SECItem oid; | |
| 235 | |
| 236 PR_ASSERT(hashalg != NULL); | |
| 237 PR_ASSERT(encalg != NULL); | |
| 238 | |
| 239 switch (sigAlg) { | |
| 240 /* We probably shouldn't be generating MD2 signatures either */ | |
| 241 case SEC_OID_PKCS1_MD2_WITH_RSA_ENCRYPTION: | |
| 242 *hashalg = SEC_OID_MD2; | |
| 243 break; | |
| 244 case SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION: | |
| 245 *hashalg = SEC_OID_MD5; | |
| 246 break; | |
| 247 case SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION: | |
| 248 case SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE: | |
| 249 case SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE: | |
| 250 *hashalg = SEC_OID_SHA1; | |
| 251 break; | |
| 252 case SEC_OID_PKCS1_RSA_ENCRYPTION: | |
| 253 case SEC_OID_PKCS1_RSA_PSS_SIGNATURE: | |
| 254 *hashalg = SEC_OID_UNKNOWN; /* get it from the RSA signature */ | |
| 255 break; | |
| 256 | |
| 257 case SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE: | |
| 258 case SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION: | |
| 259 case SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST: | |
| 260 *hashalg = SEC_OID_SHA224; | |
| 261 break; | |
| 262 case SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE: | |
| 263 case SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION: | |
| 264 case SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST: | |
| 265 *hashalg = SEC_OID_SHA256; | |
| 266 break; | |
| 267 case SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE: | |
| 268 case SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION: | |
| 269 *hashalg = SEC_OID_SHA384; | |
| 270 break; | |
| 271 case SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE: | |
| 272 case SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION: | |
| 273 *hashalg = SEC_OID_SHA512; | |
| 274 break; | |
| 275 | |
| 276 /* what about normal DSA? */ | |
| 277 case SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST: | |
| 278 case SEC_OID_BOGUS_DSA_SIGNATURE_WITH_SHA1_DIGEST: | |
| 279 case SEC_OID_ANSIX962_ECDSA_SHA1_SIGNATURE: | |
| 280 *hashalg = SEC_OID_SHA1; | |
| 281 break; | |
| 282 case SEC_OID_MISSI_DSS: | |
| 283 case SEC_OID_MISSI_KEA_DSS: | |
| 284 case SEC_OID_MISSI_KEA_DSS_OLD: | |
| 285 case SEC_OID_MISSI_DSS_OLD: | |
| 286 *hashalg = SEC_OID_SHA1; | |
| 287 break; | |
| 288 case SEC_OID_ANSIX962_ECDSA_SIGNATURE_RECOMMENDED_DIGEST: | |
| 289 /* This is an EC algorithm. Recommended means the largest | |
| 290 * hash algorithm that is not reduced by the keysize of | |
| 291 * the EC algorithm. Note that key strength is in bytes and | |
| 292 * algorithms are specified in bits. Never use an algorithm | |
| 293 * weaker than sha1. */ | |
| 294 len = SECKEY_PublicKeyStrength(key); | |
| 295 if (len < 28) { /* 28 bytes == 224 bits */ | |
| 296 *hashalg = SEC_OID_SHA1; | |
| 297 } else if (len < 32) { /* 32 bytes == 256 bits */ | |
| 298 *hashalg = SEC_OID_SHA224; | |
| 299 } else if (len < 48) { /* 48 bytes == 384 bits */ | |
| 300 *hashalg = SEC_OID_SHA256; | |
| 301 } else if (len < 64) { /* 48 bytes == 512 bits */ | |
| 302 *hashalg = SEC_OID_SHA384; | |
| 303 } else { | |
| 304 /* use the largest in this case */ | |
| 305 *hashalg = SEC_OID_SHA512; | |
| 306 } | |
| 307 break; | |
| 308 case SEC_OID_ANSIX962_ECDSA_SIGNATURE_SPECIFIED_DIGEST: | |
| 309 if (param == NULL) { | |
| 310 PORT_SetError(SEC_ERROR_INVALID_ALGORITHM); | |
| 311 return SECFailure; | |
| 312 } | |
| 313 arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE); | |
| 314 if (arena == NULL) { | |
| 315 return SECFailure; | |
| 316 } | |
| 317 rv = SEC_QuickDERDecodeItem(arena, &oid, hashParameterTemplate, para
m); | |
| 318 if (rv == SECSuccess) { | |
| 319 *hashalg = SECOID_FindOIDTag(&oid); | |
| 320 } | |
| 321 PORT_FreeArena(arena, PR_FALSE); | |
| 322 if (rv != SECSuccess) { | |
| 323 return rv; | |
| 324 } | |
| 325 /* only accept hash algorithms */ | |
| 326 if (HASH_GetHashTypeByOidTag(*hashalg) == HASH_AlgNULL) { | |
| 327 /* error set by HASH_GetHashTypeByOidTag */ | |
| 328 return SECFailure; | |
| 329 } | |
| 330 break; | |
| 331 /* we don't implement MD4 hashes */ | |
| 332 case SEC_OID_PKCS1_MD4_WITH_RSA_ENCRYPTION: | |
| 333 default: | |
| 334 PORT_SetError(SEC_ERROR_INVALID_ALGORITHM); | |
| 335 return SECFailure; | |
| 336 } | |
| 337 /* get the "encryption" algorithm */ | |
| 338 switch (sigAlg) { | |
| 339 case SEC_OID_PKCS1_RSA_ENCRYPTION: | |
| 340 case SEC_OID_PKCS1_MD2_WITH_RSA_ENCRYPTION: | |
| 341 case SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION: | |
| 342 case SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION: | |
| 343 case SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE: | |
| 344 case SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE: | |
| 345 case SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION: | |
| 346 case SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION: | |
| 347 case SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION: | |
| 348 case SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION: | |
| 349 *encalg = SEC_OID_PKCS1_RSA_ENCRYPTION; | |
| 350 break; | |
| 351 case SEC_OID_PKCS1_RSA_PSS_SIGNATURE: | |
| 352 *encalg = SEC_OID_PKCS1_RSA_PSS_SIGNATURE; | |
| 353 break; | |
| 354 | |
| 355 /* what about normal DSA? */ | |
| 356 case SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST: | |
| 357 case SEC_OID_BOGUS_DSA_SIGNATURE_WITH_SHA1_DIGEST: | |
| 358 case SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST: | |
| 359 case SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST: | |
| 360 *encalg = SEC_OID_ANSIX9_DSA_SIGNATURE; | |
| 361 break; | |
| 362 case SEC_OID_MISSI_DSS: | |
| 363 case SEC_OID_MISSI_KEA_DSS: | |
| 364 case SEC_OID_MISSI_KEA_DSS_OLD: | |
| 365 case SEC_OID_MISSI_DSS_OLD: | |
| 366 *encalg = SEC_OID_MISSI_DSS; | |
| 367 break; | |
| 368 case SEC_OID_ANSIX962_ECDSA_SHA1_SIGNATURE: | |
| 369 case SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE: | |
| 370 case SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE: | |
| 371 case SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE: | |
| 372 case SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE: | |
| 373 case SEC_OID_ANSIX962_ECDSA_SIGNATURE_RECOMMENDED_DIGEST: | |
| 374 case SEC_OID_ANSIX962_ECDSA_SIGNATURE_SPECIFIED_DIGEST: | |
| 375 *encalg = SEC_OID_ANSIX962_EC_PUBLIC_KEY; | |
| 376 break; | |
| 377 /* we don't implement MD4 hashes */ | |
| 378 case SEC_OID_PKCS1_MD4_WITH_RSA_ENCRYPTION: | |
| 379 default: | |
| 380 PORT_SetError(SEC_ERROR_INVALID_ALGORITHM); | |
| 381 return SECFailure; | |
| 382 } | |
| 383 return SECSuccess; | |
| 384 } | |
| 385 | |
| 386 /* | |
| 387 * we can verify signatures that come from 2 different sources: | |
| 388 * one in with the signature contains a signature oid, and the other | |
| 389 * in which the signature is managed by a Public key (encAlg) oid | |
| 390 * and a hash oid. The latter is the more basic, so that's what | |
| 391 * our base vfyCreate function takes. | |
| 392 * | |
| 393 * There is one noteworthy corner case, if we are using an RSA key, and the | |
| 394 * signature block is provided, then the hashAlg can be specified as | |
| 395 * SEC_OID_UNKNOWN. In this case, verify will use the hash oid supplied | |
| 396 * in the RSA signature block. | |
| 397 */ | |
| 398 static VFYContext * | |
| 399 vfy_CreateContext(const SECKEYPublicKey *key, const SECItem *sig, | |
| 400 SECOidTag encAlg, SECOidTag hashAlg, SECOidTag *hash, void *wi
ncx) | |
| 401 { | |
| 402 VFYContext *cx; | |
| 403 SECStatus rv; | |
| 404 unsigned int sigLen; | |
| 405 KeyType type; | |
| 406 | |
| 407 /* make sure the encryption algorithm matches the key type */ | |
| 408 /* RSA-PSS algorithm can be used with both rsaKey and rsaPssKey */ | |
| 409 type = seckey_GetKeyType(encAlg); | |
| 410 if ((key->keyType != type) && | |
| 411 ((key->keyType != rsaKey) || (type != rsaPssKey))) { | |
| 412 PORT_SetError(SEC_ERROR_PKCS7_KEYALG_MISMATCH); | |
| 413 return NULL; | |
| 414 } | |
| 415 | |
| 416 cx = (VFYContext *)PORT_ZAlloc(sizeof(VFYContext)); | |
| 417 if (cx == NULL) { | |
| 418 goto loser; | |
| 419 } | |
| 420 | |
| 421 cx->wincx = wincx; | |
| 422 cx->hasSignature = (sig != NULL); | |
| 423 cx->encAlg = encAlg; | |
| 424 cx->hashAlg = hashAlg; | |
| 425 cx->key = SECKEY_CopyPublicKey(key); | |
| 426 cx->pkcs1RSADigestInfo = NULL; | |
| 427 rv = SECSuccess; | |
| 428 if (sig) { | |
| 429 switch (type) { | |
| 430 case rsaKey: | |
| 431 rv = recoverPKCS1DigestInfo(hashAlg, &cx->hashAlg, | |
| 432 &cx->pkcs1RSADigestInfo, | |
| 433 &cx->pkcs1RSADigestInfoLen, | |
| 434 cx->key, | |
| 435 sig, wincx); | |
| 436 break; | |
| 437 case dsaKey: | |
| 438 case ecKey: | |
| 439 sigLen = SECKEY_SignatureLen(key); | |
| 440 if (sigLen == 0) { | |
| 441 /* error set by SECKEY_SignatureLen */ | |
| 442 rv = SECFailure; | |
| 443 break; | |
| 444 } | |
| 445 rv = decodeECorDSASignature(encAlg, sig, cx->u.buffer, sigLen); | |
| 446 break; | |
| 447 default: | |
| 448 rv = SECFailure; | |
| 449 PORT_SetError(SEC_ERROR_UNSUPPORTED_KEYALG); | |
| 450 break; | |
| 451 } | |
| 452 } | |
| 453 | |
| 454 if (rv) | |
| 455 goto loser; | |
| 456 | |
| 457 /* check hash alg again, RSA may have changed it.*/ | |
| 458 if (HASH_GetHashTypeByOidTag(cx->hashAlg) == HASH_AlgNULL) { | |
| 459 /* error set by HASH_GetHashTypeByOidTag */ | |
| 460 goto loser; | |
| 461 } | |
| 462 | |
| 463 if (hash) { | |
| 464 *hash = cx->hashAlg; | |
| 465 } | |
| 466 return cx; | |
| 467 | |
| 468 loser: | |
| 469 if (cx) { | |
| 470 VFY_DestroyContext(cx, PR_TRUE); | |
| 471 } | |
| 472 return 0; | |
| 473 } | |
| 474 | |
| 475 VFYContext * | |
| 476 VFY_CreateContext(SECKEYPublicKey *key, SECItem *sig, SECOidTag sigAlg, | |
| 477 void *wincx) | |
| 478 { | |
| 479 SECOidTag encAlg, hashAlg; | |
| 480 SECStatus rv = sec_DecodeSigAlg(key, sigAlg, NULL, &encAlg, &hashAlg); | |
| 481 if (rv != SECSuccess) { | |
| 482 return NULL; | |
| 483 } | |
| 484 return vfy_CreateContext(key, sig, encAlg, hashAlg, NULL, wincx); | |
| 485 } | |
| 486 | |
| 487 VFYContext * | |
| 488 VFY_CreateContextDirect(const SECKEYPublicKey *key, const SECItem *sig, | |
| 489 SECOidTag encAlg, SECOidTag hashAlg, | |
| 490 SECOidTag *hash, void *wincx) | |
| 491 { | |
| 492 return vfy_CreateContext(key, sig, encAlg, hashAlg, hash, wincx); | |
| 493 } | |
| 494 | |
| 495 VFYContext * | |
| 496 VFY_CreateContextWithAlgorithmID(const SECKEYPublicKey *key, const SECItem *sig, | |
| 497 const SECAlgorithmID *sigAlgorithm, SECOidTag *
hash, void *wincx) | |
| 498 { | |
| 499 SECOidTag encAlg, hashAlg; | |
| 500 SECStatus rv = sec_DecodeSigAlg(key, | |
| 501 SECOID_GetAlgorithmTag((SECAlgorithmID *)sig
Algorithm), | |
| 502 &sigAlgorithm->parameters, &encAlg, &hashAlg
); | |
| 503 if (rv != SECSuccess) { | |
| 504 return NULL; | |
| 505 } | |
| 506 return vfy_CreateContext(key, sig, encAlg, hashAlg, hash, wincx); | |
| 507 } | |
| 508 | |
| 509 void | |
| 510 VFY_DestroyContext(VFYContext *cx, PRBool freeit) | |
| 511 { | |
| 512 if (cx) { | |
| 513 if (cx->hashcx != NULL) { | |
| 514 (*cx->hashobj->destroy)(cx->hashcx, PR_TRUE); | |
| 515 cx->hashcx = NULL; | |
| 516 } | |
| 517 if (cx->key) { | |
| 518 SECKEY_DestroyPublicKey(cx->key); | |
| 519 } | |
| 520 if (cx->pkcs1RSADigestInfo) { | |
| 521 PORT_Free(cx->pkcs1RSADigestInfo); | |
| 522 } | |
| 523 if (freeit) { | |
| 524 PORT_ZFree(cx, sizeof(VFYContext)); | |
| 525 } | |
| 526 } | |
| 527 } | |
| 528 | |
| 529 SECStatus | |
| 530 VFY_Begin(VFYContext *cx) | |
| 531 { | |
| 532 if (cx->hashcx != NULL) { | |
| 533 (*cx->hashobj->destroy)(cx->hashcx, PR_TRUE); | |
| 534 cx->hashcx = NULL; | |
| 535 } | |
| 536 | |
| 537 cx->hashobj = HASH_GetHashObjectByOidTag(cx->hashAlg); | |
| 538 if (!cx->hashobj) | |
| 539 return SECFailure; /* error code is set */ | |
| 540 | |
| 541 cx->hashcx = (*cx->hashobj->create)(); | |
| 542 if (cx->hashcx == NULL) | |
| 543 return SECFailure; | |
| 544 | |
| 545 (*cx->hashobj->begin)(cx->hashcx); | |
| 546 return SECSuccess; | |
| 547 } | |
| 548 | |
| 549 SECStatus | |
| 550 VFY_Update(VFYContext *cx, const unsigned char *input, unsigned inputLen) | |
| 551 { | |
| 552 if (cx->hashcx == NULL) { | |
| 553 PORT_SetError(SEC_ERROR_INVALID_ARGS); | |
| 554 return SECFailure; | |
| 555 } | |
| 556 (*cx->hashobj->update)(cx->hashcx, input, inputLen); | |
| 557 return SECSuccess; | |
| 558 } | |
| 559 | |
| 560 SECStatus | |
| 561 VFY_EndWithSignature(VFYContext *cx, SECItem *sig) | |
| 562 { | |
| 563 unsigned char final[HASH_LENGTH_MAX]; | |
| 564 unsigned part; | |
| 565 SECItem hash, dsasig; /* dsasig is also used for ECDSA */ | |
| 566 SECStatus rv; | |
| 567 | |
| 568 if ((cx->hasSignature == PR_FALSE) && (sig == NULL)) { | |
| 569 PORT_SetError(SEC_ERROR_INVALID_ARGS); | |
| 570 return SECFailure; | |
| 571 } | |
| 572 | |
| 573 if (cx->hashcx == NULL) { | |
| 574 PORT_SetError(SEC_ERROR_INVALID_ARGS); | |
| 575 return SECFailure; | |
| 576 } | |
| 577 (*cx->hashobj->end)(cx->hashcx, final, &part, sizeof(final)); | |
| 578 switch (cx->key->keyType) { | |
| 579 case ecKey: | |
| 580 case dsaKey: | |
| 581 dsasig.data = cx->u.buffer; | |
| 582 dsasig.len = SECKEY_SignatureLen(cx->key); | |
| 583 if (dsasig.len == 0) { | |
| 584 return SECFailure; | |
| 585 } | |
| 586 if (sig) { | |
| 587 rv = decodeECorDSASignature(cx->encAlg, sig, dsasig.data, | |
| 588 dsasig.len); | |
| 589 if (rv != SECSuccess) { | |
| 590 PORT_SetError(SEC_ERROR_BAD_SIGNATURE); | |
| 591 return SECFailure; | |
| 592 } | |
| 593 } | |
| 594 hash.data = final; | |
| 595 hash.len = part; | |
| 596 if (PK11_Verify(cx->key, &dsasig, &hash, cx->wincx) != SECSuccess) { | |
| 597 PORT_SetError(SEC_ERROR_BAD_SIGNATURE); | |
| 598 return SECFailure; | |
| 599 } | |
| 600 break; | |
| 601 case rsaKey: { | |
| 602 SECItem digest; | |
| 603 digest.data = final; | |
| 604 digest.len = part; | |
| 605 if (sig) { | |
| 606 SECOidTag hashid; | |
| 607 PORT_Assert(cx->hashAlg != SEC_OID_UNKNOWN); | |
| 608 rv = recoverPKCS1DigestInfo(cx->hashAlg, &hashid, | |
| 609 &cx->pkcs1RSADigestInfo, | |
| 610 &cx->pkcs1RSADigestInfoLen, | |
| 611 cx->key, | |
| 612 sig, cx->wincx); | |
| 613 PORT_Assert(cx->hashAlg == hashid); | |
| 614 if (rv != SECSuccess) { | |
| 615 return SECFailure; | |
| 616 } | |
| 617 } | |
| 618 return verifyPKCS1DigestInfo(cx, &digest); | |
| 619 } | |
| 620 default: | |
| 621 PORT_SetError(SEC_ERROR_BAD_SIGNATURE); | |
| 622 return SECFailure; /* shouldn't happen */ | |
| 623 } | |
| 624 return SECSuccess; | |
| 625 } | |
| 626 | |
| 627 SECStatus | |
| 628 VFY_End(VFYContext *cx) | |
| 629 { | |
| 630 return VFY_EndWithSignature(cx, NULL); | |
| 631 } | |
| 632 | |
| 633 /************************************************************************/ | |
| 634 /* | |
| 635 * Verify that a previously-computed digest matches a signature. | |
| 636 */ | |
| 637 static SECStatus | |
| 638 vfy_VerifyDigest(const SECItem *digest, const SECKEYPublicKey *key, | |
| 639 const SECItem *sig, SECOidTag encAlg, SECOidTag hashAlg, | |
| 640 void *wincx) | |
| 641 { | |
| 642 SECStatus rv; | |
| 643 VFYContext *cx; | |
| 644 SECItem dsasig; /* also used for ECDSA */ | |
| 645 | |
| 646 rv = SECFailure; | |
| 647 | |
| 648 cx = vfy_CreateContext(key, sig, encAlg, hashAlg, NULL, wincx); | |
| 649 if (cx != NULL) { | |
| 650 switch (key->keyType) { | |
| 651 case rsaKey: | |
| 652 rv = verifyPKCS1DigestInfo(cx, digest); | |
| 653 break; | |
| 654 case dsaKey: | |
| 655 case ecKey: | |
| 656 dsasig.data = cx->u.buffer; | |
| 657 dsasig.len = SECKEY_SignatureLen(cx->key); | |
| 658 if (dsasig.len == 0) { | |
| 659 break; | |
| 660 } | |
| 661 if (PK11_Verify(cx->key, &dsasig, (SECItem *)digest, cx->wincx)
!= | |
| 662 SECSuccess) { | |
| 663 PORT_SetError(SEC_ERROR_BAD_SIGNATURE); | |
| 664 } else { | |
| 665 rv = SECSuccess; | |
| 666 } | |
| 667 break; | |
| 668 default: | |
| 669 break; | |
| 670 } | |
| 671 VFY_DestroyContext(cx, PR_TRUE); | |
| 672 } | |
| 673 return rv; | |
| 674 } | |
| 675 | |
| 676 SECStatus | |
| 677 VFY_VerifyDigestDirect(const SECItem *digest, const SECKEYPublicKey *key, | |
| 678 const SECItem *sig, SECOidTag encAlg, | |
| 679 SECOidTag hashAlg, void *wincx) | |
| 680 { | |
| 681 return vfy_VerifyDigest(digest, key, sig, encAlg, hashAlg, wincx); | |
| 682 } | |
| 683 | |
| 684 SECStatus | |
| 685 VFY_VerifyDigest(SECItem *digest, SECKEYPublicKey *key, SECItem *sig, | |
| 686 SECOidTag algid, void *wincx) | |
| 687 { | |
| 688 SECOidTag encAlg, hashAlg; | |
| 689 SECStatus rv = sec_DecodeSigAlg(key, algid, NULL, &encAlg, &hashAlg); | |
| 690 if (rv != SECSuccess) { | |
| 691 return SECFailure; | |
| 692 } | |
| 693 return vfy_VerifyDigest(digest, key, sig, encAlg, hashAlg, wincx); | |
| 694 } | |
| 695 | |
| 696 /* | |
| 697 * this function takes an optional hash oid, which the digest function | |
| 698 * will be compared with our target hash value. | |
| 699 */ | |
| 700 SECStatus | |
| 701 VFY_VerifyDigestWithAlgorithmID(const SECItem *digest, | |
| 702 const SECKEYPublicKey *key, const SECItem *sig, | |
| 703 const SECAlgorithmID *sigAlgorithm, | |
| 704 SECOidTag hashCmp, void *wincx) | |
| 705 { | |
| 706 SECOidTag encAlg, hashAlg; | |
| 707 SECStatus rv = sec_DecodeSigAlg(key, | |
| 708 SECOID_GetAlgorithmTag((SECAlgorithmID *)sig
Algorithm), | |
| 709 &sigAlgorithm->parameters, &encAlg, &hashAlg
); | |
| 710 if (rv != SECSuccess) { | |
| 711 return rv; | |
| 712 } | |
| 713 if (hashCmp != SEC_OID_UNKNOWN && | |
| 714 hashAlg != SEC_OID_UNKNOWN && | |
| 715 hashCmp != hashAlg) { | |
| 716 PORT_SetError(SEC_ERROR_BAD_SIGNATURE); | |
| 717 return SECFailure; | |
| 718 } | |
| 719 return vfy_VerifyDigest(digest, key, sig, encAlg, hashAlg, wincx); | |
| 720 } | |
| 721 | |
| 722 static SECStatus | |
| 723 vfy_VerifyData(const unsigned char *buf, int len, const SECKEYPublicKey *key, | |
| 724 const SECItem *sig, SECOidTag encAlg, SECOidTag hashAlg, | |
| 725 SECOidTag *hash, void *wincx) | |
| 726 { | |
| 727 SECStatus rv; | |
| 728 VFYContext *cx; | |
| 729 | |
| 730 cx = vfy_CreateContext(key, sig, encAlg, hashAlg, hash, wincx); | |
| 731 if (cx == NULL) | |
| 732 return SECFailure; | |
| 733 | |
| 734 rv = VFY_Begin(cx); | |
| 735 if (rv == SECSuccess) { | |
| 736 rv = VFY_Update(cx, (unsigned char *)buf, len); | |
| 737 if (rv == SECSuccess) | |
| 738 rv = VFY_End(cx); | |
| 739 } | |
| 740 | |
| 741 VFY_DestroyContext(cx, PR_TRUE); | |
| 742 return rv; | |
| 743 } | |
| 744 | |
| 745 SECStatus | |
| 746 VFY_VerifyDataDirect(const unsigned char *buf, int len, | |
| 747 const SECKEYPublicKey *key, const SECItem *sig, | |
| 748 SECOidTag encAlg, SECOidTag hashAlg, | |
| 749 SECOidTag *hash, void *wincx) | |
| 750 { | |
| 751 return vfy_VerifyData(buf, len, key, sig, encAlg, hashAlg, hash, wincx); | |
| 752 } | |
| 753 | |
| 754 SECStatus | |
| 755 VFY_VerifyData(const unsigned char *buf, int len, const SECKEYPublicKey *key, | |
| 756 const SECItem *sig, SECOidTag algid, void *wincx) | |
| 757 { | |
| 758 SECOidTag encAlg, hashAlg; | |
| 759 SECStatus rv = sec_DecodeSigAlg(key, algid, NULL, &encAlg, &hashAlg); | |
| 760 if (rv != SECSuccess) { | |
| 761 return rv; | |
| 762 } | |
| 763 return vfy_VerifyData(buf, len, key, sig, encAlg, hashAlg, NULL, wincx); | |
| 764 } | |
| 765 | |
| 766 SECStatus | |
| 767 VFY_VerifyDataWithAlgorithmID(const unsigned char *buf, int len, | |
| 768 const SECKEYPublicKey *key, | |
| 769 const SECItem *sig, | |
| 770 const SECAlgorithmID *sigAlgorithm, | |
| 771 SECOidTag *hash, void *wincx) | |
| 772 { | |
| 773 SECOidTag encAlg, hashAlg; | |
| 774 SECOidTag sigAlg = SECOID_GetAlgorithmTag((SECAlgorithmID *)sigAlgorithm); | |
| 775 SECStatus rv = sec_DecodeSigAlg(key, sigAlg, | |
| 776 &sigAlgorithm->parameters, &encAlg, &hashAlg
); | |
| 777 if (rv != SECSuccess) { | |
| 778 return rv; | |
| 779 } | |
| 780 return vfy_VerifyData(buf, len, key, sig, encAlg, hashAlg, hash, wincx); | |
| 781 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2078763002:
Delete bundled copy of NSS and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/nss@master