| /* |
| * Verification stuff. |
| * |
| * This Source Code Form is subject to the terms of the Mozilla Public |
| * License, v. 2.0. If a copy of the MPL was not distributed with this |
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| |
| #include <stdio.h> |
| #include "cryptohi.h" |
| #include "sechash.h" |
| #include "keyhi.h" |
| #include "secasn1.h" |
| #include "secoid.h" |
| #include "pk11func.h" |
| #include "pkcs1sig.h" |
| #include "secdig.h" |
| #include "secerr.h" |
| #include "keyi.h" |
| |
| /* |
| ** Recover the DigestInfo from an RSA PKCS#1 signature. |
| ** |
| ** If givenDigestAlg != SEC_OID_UNKNOWN, copy givenDigestAlg to digestAlgOut. |
| ** Otherwise, parse the DigestInfo structure and store the decoded digest |
| ** algorithm into digestAlgOut. |
| ** |
| ** Store the encoded DigestInfo into digestInfo. |
| ** Store the DigestInfo length into digestInfoLen. |
| ** |
| ** This function does *not* verify that the AlgorithmIdentifier in the |
| ** DigestInfo identifies givenDigestAlg or that the DigestInfo is encoded |
| ** correctly; verifyPKCS1DigestInfo does that. |
| ** |
| ** XXX this is assuming that the signature algorithm has WITH_RSA_ENCRYPTION |
| */ |
| static SECStatus |
| recoverPKCS1DigestInfo(SECOidTag givenDigestAlg, |
| /*out*/ SECOidTag *digestAlgOut, |
| /*out*/ unsigned char **digestInfo, |
| /*out*/ unsigned int *digestInfoLen, |
| SECKEYPublicKey *key, |
| const SECItem *sig, void *wincx) |
| { |
| SGNDigestInfo *di = NULL; |
| SECItem it; |
| PRBool rv = SECSuccess; |
| |
| PORT_Assert(digestAlgOut); |
| PORT_Assert(digestInfo); |
| PORT_Assert(digestInfoLen); |
| PORT_Assert(key); |
| PORT_Assert(key->keyType == rsaKey); |
| PORT_Assert(sig); |
| |
| it.data = NULL; |
| it.len = SECKEY_PublicKeyStrength(key); |
| if (it.len != 0) { |
| it.data = (unsigned char *)PORT_Alloc(it.len); |
| } |
| if (it.len == 0 || it.data == NULL) { |
| rv = SECFailure; |
| } |
| |
| if (rv == SECSuccess) { |
| /* decrypt the block */ |
| rv = PK11_VerifyRecover(key, sig, &it, wincx); |
| } |
| |
| if (rv == SECSuccess) { |
| if (givenDigestAlg != SEC_OID_UNKNOWN) { |
| /* We don't need to parse the DigestInfo if the caller gave us the |
| * digest algorithm to use. Later verifyPKCS1DigestInfo will verify |
| * that the DigestInfo identifies the given digest algorithm and |
| * that the DigestInfo is encoded absolutely correctly. |
| */ |
| *digestInfoLen = it.len; |
| *digestInfo = (unsigned char *)it.data; |
| *digestAlgOut = givenDigestAlg; |
| return SECSuccess; |
| } |
| } |
| |
| if (rv == SECSuccess) { |
| /* The caller didn't specify a digest algorithm to use, so choose the |
| * digest algorithm by parsing the AlgorithmIdentifier within the |
| * DigestInfo. |
| */ |
| di = SGN_DecodeDigestInfo(&it); |
| if (!di) { |
| rv = SECFailure; |
| } |
| } |
| |
| if (rv == SECSuccess) { |
| *digestAlgOut = SECOID_GetAlgorithmTag(&di->digestAlgorithm); |
| if (*digestAlgOut == SEC_OID_UNKNOWN) { |
| rv = SECFailure; |
| } |
| } |
| |
| if (di) { |
| SGN_DestroyDigestInfo(di); |
| } |
| |
| if (rv == SECSuccess) { |
| *digestInfoLen = it.len; |
| *digestInfo = (unsigned char *)it.data; |
| } else { |
| if (it.data) { |
| PORT_Free(it.data); |
| } |
| *digestInfo = NULL; |
| *digestInfoLen = 0; |
| PORT_SetError(SEC_ERROR_BAD_SIGNATURE); |
| } |
| |
| return rv; |
| } |
| |
| struct VFYContextStr { |
| SECOidTag hashAlg; /* the hash algorithm */ |
| SECKEYPublicKey *key; |
| /* |
| * This buffer holds either the digest or the full signature |
| * depending on the type of the signature (key->keyType). It is |
| * defined as a union to make sure it always has enough space. |
| * |
| * Use the "buffer" union member to reference the buffer. |
| * Note: do not take the size of the "buffer" union member. Take |
| * the size of the union or some other union member instead. |
| */ |
| union { |
| unsigned char buffer[1]; |
| |
| /* the full DSA signature... 40 bytes */ |
| unsigned char dsasig[DSA_MAX_SIGNATURE_LEN]; |
| /* the full ECDSA signature */ |
| unsigned char ecdsasig[2 * MAX_ECKEY_LEN]; |
| /* the full RSA signature, only used in RSA-PSS */ |
| unsigned char rsasig[(RSA_MAX_MODULUS_BITS + 7) / 8]; |
| } u; |
| unsigned int pkcs1RSADigestInfoLen; |
| /* the encoded DigestInfo from a RSA PKCS#1 signature */ |
| unsigned char *pkcs1RSADigestInfo; |
| void *wincx; |
| void *hashcx; |
| const SECHashObject *hashobj; |
| SECOidTag encAlg; /* enc alg */ |
| PRBool hasSignature; /* true if the signature was provided in the |
| * VFY_CreateContext call. If false, the |
| * signature must be provided with a |
| * VFY_EndWithSignature call. */ |
| SECItem *params; |
| }; |
| |
| static SECStatus |
| verifyPKCS1DigestInfo(const VFYContext *cx, const SECItem *digest) |
| { |
| SECItem pkcs1DigestInfo; |
| pkcs1DigestInfo.data = cx->pkcs1RSADigestInfo; |
| pkcs1DigestInfo.len = cx->pkcs1RSADigestInfoLen; |
| return _SGN_VerifyPKCS1DigestInfo( |
| cx->hashAlg, digest, &pkcs1DigestInfo, |
| PR_FALSE /*XXX: unsafeAllowMissingParameters*/); |
| } |
| |
| static unsigned int |
| checkedSignatureLen(const SECKEYPublicKey *pubk) |
| { |
| unsigned int sigLen = SECKEY_SignatureLen(pubk); |
| if (sigLen == 0) { |
| /* Error set by SECKEY_SignatureLen */ |
| return sigLen; |
| } |
| unsigned int maxSigLen; |
| switch (pubk->keyType) { |
| case rsaKey: |
| case rsaPssKey: |
| maxSigLen = (RSA_MAX_MODULUS_BITS + 7) / 8; |
| break; |
| case dsaKey: |
| maxSigLen = DSA_MAX_SIGNATURE_LEN; |
| break; |
| case ecKey: |
| maxSigLen = 2 * MAX_ECKEY_LEN; |
| break; |
| default: |
| PORT_SetError(SEC_ERROR_UNSUPPORTED_KEYALG); |
| return 0; |
| } |
| if (sigLen > maxSigLen) { |
| PORT_SetError(SEC_ERROR_INVALID_KEY); |
| return 0; |
| } |
| return sigLen; |
| } |
| |
| /* |
| * decode the ECDSA or DSA signature from it's DER wrapping. |
| * The unwrapped/raw signature is placed in the buffer pointed |
| * to by dsig and has enough room for len bytes. |
| */ |
| static SECStatus |
| decodeECorDSASignature(SECOidTag algid, const SECItem *sig, unsigned char *dsig, |
| unsigned int len) |
| { |
| SECItem *dsasig = NULL; /* also used for ECDSA */ |
| |
| /* Safety: Ensure algId is as expected and that signature size is within maxmimums */ |
| if (algid == SEC_OID_ANSIX9_DSA_SIGNATURE) { |
| if (len > DSA_MAX_SIGNATURE_LEN) { |
| goto loser; |
| } |
| } else if (algid == SEC_OID_ANSIX962_EC_PUBLIC_KEY) { |
| if (len > MAX_ECKEY_LEN * 2) { |
| goto loser; |
| } |
| } else { |
| goto loser; |
| } |
| |
| /* Decode and pad to length */ |
| dsasig = DSAU_DecodeDerSigToLen((SECItem *)sig, len); |
| if (dsasig == NULL) { |
| goto loser; |
| } |
| if (dsasig->len != len) { |
| SECITEM_FreeItem(dsasig, PR_TRUE); |
| goto loser; |
| } |
| |
| PORT_Memcpy(dsig, dsasig->data, len); |
| SECITEM_FreeItem(dsasig, PR_TRUE); |
| |
| return SECSuccess; |
| |
| loser: |
| PORT_SetError(SEC_ERROR_BAD_DER); |
| return SECFailure; |
| } |
| |
| const SEC_ASN1Template hashParameterTemplate[] = |
| { |
| { SEC_ASN1_SEQUENCE, 0, NULL, sizeof(SECItem) }, |
| { SEC_ASN1_OBJECT_ID, 0 }, |
| { SEC_ASN1_SKIP_REST }, |
| { 0 } |
| }; |
| |
| /* |
| * Get just the encryption algorithm from the signature algorithm |
| */ |
| SECOidTag |
| sec_GetEncAlgFromSigAlg(SECOidTag sigAlg) |
| { |
| /* get the "encryption" algorithm */ |
| switch (sigAlg) { |
| case SEC_OID_PKCS1_RSA_ENCRYPTION: |
| case SEC_OID_PKCS1_MD2_WITH_RSA_ENCRYPTION: |
| case SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION: |
| case SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION: |
| case SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE: |
| case SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE: |
| case SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION: |
| case SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION: |
| case SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION: |
| case SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION: |
| return SEC_OID_PKCS1_RSA_ENCRYPTION; |
| case SEC_OID_PKCS1_RSA_PSS_SIGNATURE: |
| return SEC_OID_PKCS1_RSA_PSS_SIGNATURE; |
| |
| /* what about normal DSA? */ |
| case SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST: |
| case SEC_OID_BOGUS_DSA_SIGNATURE_WITH_SHA1_DIGEST: |
| case SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST: |
| case SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST: |
| return SEC_OID_ANSIX9_DSA_SIGNATURE; |
| case SEC_OID_MISSI_DSS: |
| case SEC_OID_MISSI_KEA_DSS: |
| case SEC_OID_MISSI_KEA_DSS_OLD: |
| case SEC_OID_MISSI_DSS_OLD: |
| return SEC_OID_MISSI_DSS; |
| case SEC_OID_ANSIX962_ECDSA_SHA1_SIGNATURE: |
| case SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE: |
| case SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE: |
| case SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE: |
| case SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE: |
| case SEC_OID_ANSIX962_ECDSA_SIGNATURE_RECOMMENDED_DIGEST: |
| case SEC_OID_ANSIX962_ECDSA_SIGNATURE_SPECIFIED_DIGEST: |
| return SEC_OID_ANSIX962_EC_PUBLIC_KEY; |
| /* we don't implement MD4 hashes */ |
| case SEC_OID_PKCS1_MD4_WITH_RSA_ENCRYPTION: |
| default: |
| PORT_SetError(SEC_ERROR_INVALID_ALGORITHM); |
| break; |
| } |
| return SEC_OID_UNKNOWN; |
| } |
| |
| /* |
| * Pulls the hash algorithm, signing algorithm, and key type out of a |
| * composite algorithm. |
| * |
| * sigAlg: the composite algorithm to dissect. |
| * hashalg: address of a SECOidTag which will be set with the hash algorithm. |
| * encalg: address of a SECOidTag which will be set with the signing alg. |
| * |
| * Returns: SECSuccess if the algorithm was acceptable, SECFailure if the |
| * algorithm was not found or was not a signing algorithm. |
| */ |
| SECStatus |
| sec_DecodeSigAlg(const SECKEYPublicKey *key, SECOidTag sigAlg, |
| const SECItem *param, SECOidTag *encalgp, SECOidTag *hashalg) |
| { |
| unsigned int len; |
| PLArenaPool *arena; |
| SECStatus rv; |
| SECItem oid; |
| SECOidTag encalg; |
| |
| PR_ASSERT(hashalg != NULL); |
| PR_ASSERT(encalgp != NULL); |
| |
| switch (sigAlg) { |
| /* We probably shouldn't be generating MD2 signatures either */ |
| case SEC_OID_PKCS1_MD2_WITH_RSA_ENCRYPTION: |
| *hashalg = SEC_OID_MD2; |
| break; |
| case SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION: |
| *hashalg = SEC_OID_MD5; |
| break; |
| case SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION: |
| case SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE: |
| case SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE: |
| *hashalg = SEC_OID_SHA1; |
| break; |
| case SEC_OID_PKCS1_RSA_ENCRYPTION: |
| *hashalg = SEC_OID_UNKNOWN; /* get it from the RSA signature */ |
| break; |
| case SEC_OID_PKCS1_RSA_PSS_SIGNATURE: |
| if (param && param->data) { |
| PORTCheapArenaPool tmpArena; |
| |
| PORT_InitCheapArena(&tmpArena, DER_DEFAULT_CHUNKSIZE); |
| rv = sec_DecodeRSAPSSParams(&tmpArena.arena, param, |
| hashalg, NULL, NULL); |
| PORT_DestroyCheapArena(&tmpArena); |
| |
| /* only accept hash algorithms */ |
| if (HASH_GetHashTypeByOidTag(*hashalg) == HASH_AlgNULL) { |
| /* error set by HASH_GetHashTypeByOidTag */ |
| return SECFailure; |
| } |
| } else { |
| *hashalg = SEC_OID_SHA1; /* default, SHA-1 */ |
| } |
| break; |
| |
| case SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE: |
| case SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION: |
| case SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST: |
| *hashalg = SEC_OID_SHA224; |
| break; |
| case SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE: |
| case SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION: |
| case SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST: |
| *hashalg = SEC_OID_SHA256; |
| break; |
| case SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE: |
| case SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION: |
| *hashalg = SEC_OID_SHA384; |
| break; |
| case SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE: |
| case SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION: |
| *hashalg = SEC_OID_SHA512; |
| break; |
| |
| /* what about normal DSA? */ |
| case SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST: |
| case SEC_OID_BOGUS_DSA_SIGNATURE_WITH_SHA1_DIGEST: |
| case SEC_OID_ANSIX962_ECDSA_SHA1_SIGNATURE: |
| *hashalg = SEC_OID_SHA1; |
| break; |
| case SEC_OID_MISSI_DSS: |
| case SEC_OID_MISSI_KEA_DSS: |
| case SEC_OID_MISSI_KEA_DSS_OLD: |
| case SEC_OID_MISSI_DSS_OLD: |
| *hashalg = SEC_OID_SHA1; |
| break; |
| case SEC_OID_ANSIX962_ECDSA_SIGNATURE_RECOMMENDED_DIGEST: |
| /* This is an EC algorithm. Recommended means the largest |
| * hash algorithm that is not reduced by the keysize of |
| * the EC algorithm. Note that key strength is in bytes and |
| * algorithms are specified in bits. Never use an algorithm |
| * weaker than sha1. */ |
| len = SECKEY_PublicKeyStrength(key); |
| if (len < 28) { /* 28 bytes == 224 bits */ |
| *hashalg = SEC_OID_SHA1; |
| } else if (len < 32) { /* 32 bytes == 256 bits */ |
| *hashalg = SEC_OID_SHA224; |
| } else if (len < 48) { /* 48 bytes == 384 bits */ |
| *hashalg = SEC_OID_SHA256; |
| } else if (len < 64) { /* 48 bytes == 512 bits */ |
| *hashalg = SEC_OID_SHA384; |
| } else { |
| /* use the largest in this case */ |
| *hashalg = SEC_OID_SHA512; |
| } |
| break; |
| case SEC_OID_ANSIX962_ECDSA_SIGNATURE_SPECIFIED_DIGEST: |
| if (param == NULL) { |
| PORT_SetError(SEC_ERROR_INVALID_ALGORITHM); |
| return SECFailure; |
| } |
| arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE); |
| if (arena == NULL) { |
| return SECFailure; |
| } |
| rv = SEC_QuickDERDecodeItem(arena, &oid, hashParameterTemplate, param); |
| if (rv == SECSuccess) { |
| *hashalg = SECOID_FindOIDTag(&oid); |
| } |
| PORT_FreeArena(arena, PR_FALSE); |
| if (rv != SECSuccess) { |
| return rv; |
| } |
| /* only accept hash algorithms */ |
| if (HASH_GetHashTypeByOidTag(*hashalg) == HASH_AlgNULL) { |
| /* error set by HASH_GetHashTypeByOidTag */ |
| return SECFailure; |
| } |
| break; |
| /* we don't implement MD4 hashes */ |
| case SEC_OID_PKCS1_MD4_WITH_RSA_ENCRYPTION: |
| default: |
| PORT_SetError(SEC_ERROR_INVALID_ALGORITHM); |
| return SECFailure; |
| } |
| |
| encalg = sec_GetEncAlgFromSigAlg(sigAlg); |
| if (encalg == SEC_OID_UNKNOWN) { |
| return SECFailure; |
| } |
| *encalgp = encalg; |
| |
| return SECSuccess; |
| } |
| |
| /* |
| * we can verify signatures that come from 2 different sources: |
| * one in with the signature contains a signature oid, and the other |
| * in which the signature is managed by a Public key (encAlg) oid |
| * and a hash oid. The latter is the more basic, so that's what |
| * our base vfyCreate function takes. |
| * |
| * There is one noteworthy corner case, if we are using an RSA key, and the |
| * signature block is provided, then the hashAlg can be specified as |
| * SEC_OID_UNKNOWN. In this case, verify will use the hash oid supplied |
| * in the RSA signature block. |
| */ |
| static VFYContext * |
| vfy_CreateContext(const SECKEYPublicKey *key, const SECItem *sig, |
| SECOidTag encAlg, SECOidTag hashAlg, SECOidTag *hash, void *wincx) |
| { |
| VFYContext *cx; |
| SECStatus rv; |
| unsigned int sigLen; |
| KeyType type; |
| PRUint32 policyFlags; |
| |
| /* make sure the encryption algorithm matches the key type */ |
| /* RSA-PSS algorithm can be used with both rsaKey and rsaPssKey */ |
| type = seckey_GetKeyType(encAlg); |
| if ((key->keyType != type) && |
| ((key->keyType != rsaKey) || (type != rsaPssKey))) { |
| PORT_SetError(SEC_ERROR_PKCS7_KEYALG_MISMATCH); |
| return NULL; |
| } |
| |
| /* check the policy on the encryption algorithm */ |
| if ((NSS_GetAlgorithmPolicy(encAlg, &policyFlags) == SECFailure) || |
| !(policyFlags & NSS_USE_ALG_IN_ANY_SIGNATURE)) { |
| PORT_SetError(SEC_ERROR_SIGNATURE_ALGORITHM_DISABLED); |
| return NULL; |
| } |
| |
| cx = (VFYContext *)PORT_ZAlloc(sizeof(VFYContext)); |
| if (cx == NULL) { |
| goto loser; |
| } |
| |
| cx->wincx = wincx; |
| cx->hasSignature = (sig != NULL); |
| cx->encAlg = encAlg; |
| cx->hashAlg = hashAlg; |
| cx->key = SECKEY_CopyPublicKey(key); |
| cx->pkcs1RSADigestInfo = NULL; |
| rv = SECSuccess; |
| if (sig) { |
| rv = SECFailure; |
| if (type == rsaKey) { |
| rv = recoverPKCS1DigestInfo(hashAlg, &cx->hashAlg, |
| &cx->pkcs1RSADigestInfo, |
| &cx->pkcs1RSADigestInfoLen, |
| cx->key, |
| sig, wincx); |
| } else { |
| sigLen = checkedSignatureLen(key); |
| /* Check signature length is within limits */ |
| if (sigLen == 0) { |
| /* error set by checkedSignatureLen */ |
| rv = SECFailure; |
| goto loser; |
| } |
| if (sigLen > sizeof(cx->u)) { |
| PORT_SetError(SEC_ERROR_BAD_SIGNATURE); |
| rv = SECFailure; |
| goto loser; |
| } |
| switch (type) { |
| case rsaPssKey: |
| if (sig->len != sigLen) { |
| PORT_SetError(SEC_ERROR_BAD_SIGNATURE); |
| rv = SECFailure; |
| goto loser; |
| } |
| PORT_Memcpy(cx->u.buffer, sig->data, sigLen); |
| rv = SECSuccess; |
| break; |
| case ecKey: |
| case dsaKey: |
| /* decodeECorDSASignature will check sigLen == sig->len after padding */ |
| rv = decodeECorDSASignature(encAlg, sig, cx->u.buffer, sigLen); |
| break; |
| default: |
| /* Unreachable */ |
| rv = SECFailure; |
| goto loser; |
| } |
| } |
| if (rv != SECSuccess) { |
| goto loser; |
| } |
| } |
| |
| /* check hash alg again, RSA may have changed it.*/ |
| if (HASH_GetHashTypeByOidTag(cx->hashAlg) == HASH_AlgNULL) { |
| /* error set by HASH_GetHashTypeByOidTag */ |
| goto loser; |
| } |
| /* check the policy on the hash algorithm. Do this after |
| * the rsa decode because some uses of this function get hash implicitly |
| * from the RSA signature itself. */ |
| if ((NSS_GetAlgorithmPolicy(cx->hashAlg, &policyFlags) == SECFailure) || |
| !(policyFlags & NSS_USE_ALG_IN_ANY_SIGNATURE)) { |
| PORT_SetError(SEC_ERROR_SIGNATURE_ALGORITHM_DISABLED); |
| goto loser; |
| } |
| |
| if (hash) { |
| *hash = cx->hashAlg; |
| } |
| return cx; |
| |
| loser: |
| if (cx) { |
| VFY_DestroyContext(cx, PR_TRUE); |
| } |
| return 0; |
| } |
| |
| VFYContext * |
| VFY_CreateContext(SECKEYPublicKey *key, SECItem *sig, SECOidTag sigAlg, |
| void *wincx) |
| { |
| SECOidTag encAlg, hashAlg; |
| SECStatus rv = sec_DecodeSigAlg(key, sigAlg, NULL, &encAlg, &hashAlg); |
| if (rv != SECSuccess) { |
| return NULL; |
| } |
| return vfy_CreateContext(key, sig, encAlg, hashAlg, NULL, wincx); |
| } |
| |
| VFYContext * |
| VFY_CreateContextDirect(const SECKEYPublicKey *key, const SECItem *sig, |
| SECOidTag encAlg, SECOidTag hashAlg, |
| SECOidTag *hash, void *wincx) |
| { |
| return vfy_CreateContext(key, sig, encAlg, hashAlg, hash, wincx); |
| } |
| |
| VFYContext * |
| VFY_CreateContextWithAlgorithmID(const SECKEYPublicKey *key, const SECItem *sig, |
| const SECAlgorithmID *sigAlgorithm, SECOidTag *hash, void *wincx) |
| { |
| VFYContext *cx; |
| SECOidTag encAlg, hashAlg; |
| SECStatus rv = sec_DecodeSigAlg(key, |
| SECOID_GetAlgorithmTag((SECAlgorithmID *)sigAlgorithm), |
| &sigAlgorithm->parameters, &encAlg, &hashAlg); |
| if (rv != SECSuccess) { |
| return NULL; |
| } |
| |
| cx = vfy_CreateContext(key, sig, encAlg, hashAlg, hash, wincx); |
| if (sigAlgorithm->parameters.data) { |
| cx->params = SECITEM_DupItem(&sigAlgorithm->parameters); |
| } |
| |
| return cx; |
| } |
| |
| void |
| VFY_DestroyContext(VFYContext *cx, PRBool freeit) |
| { |
| if (cx) { |
| if (cx->hashcx != NULL) { |
| (*cx->hashobj->destroy)(cx->hashcx, PR_TRUE); |
| cx->hashcx = NULL; |
| } |
| if (cx->key) { |
| SECKEY_DestroyPublicKey(cx->key); |
| } |
| if (cx->pkcs1RSADigestInfo) { |
| PORT_Free(cx->pkcs1RSADigestInfo); |
| } |
| if (cx->params) { |
| SECITEM_FreeItem(cx->params, PR_TRUE); |
| } |
| if (freeit) { |
| PORT_ZFree(cx, sizeof(VFYContext)); |
| } |
| } |
| } |
| |
| SECStatus |
| VFY_Begin(VFYContext *cx) |
| { |
| if (cx->hashcx != NULL) { |
| (*cx->hashobj->destroy)(cx->hashcx, PR_TRUE); |
| cx->hashcx = NULL; |
| } |
| |
| cx->hashobj = HASH_GetHashObjectByOidTag(cx->hashAlg); |
| if (!cx->hashobj) |
| return SECFailure; /* error code is set */ |
| |
| cx->hashcx = (*cx->hashobj->create)(); |
| if (cx->hashcx == NULL) |
| return SECFailure; |
| |
| (*cx->hashobj->begin)(cx->hashcx); |
| return SECSuccess; |
| } |
| |
| SECStatus |
| VFY_Update(VFYContext *cx, const unsigned char *input, unsigned inputLen) |
| { |
| if (cx->hashcx == NULL) { |
| PORT_SetError(SEC_ERROR_INVALID_ARGS); |
| return SECFailure; |
| } |
| (*cx->hashobj->update)(cx->hashcx, input, inputLen); |
| return SECSuccess; |
| } |
| |
| SECStatus |
| VFY_EndWithSignature(VFYContext *cx, SECItem *sig) |
| { |
| unsigned char final[HASH_LENGTH_MAX]; |
| unsigned part; |
| SECItem hash, rsasig, dsasig; /* dsasig is also used for ECDSA */ |
| SECStatus rv; |
| |
| if ((cx->hasSignature == PR_FALSE) && (sig == NULL)) { |
| PORT_SetError(SEC_ERROR_INVALID_ARGS); |
| return SECFailure; |
| } |
| |
| if (cx->hashcx == NULL) { |
| PORT_SetError(SEC_ERROR_INVALID_ARGS); |
| return SECFailure; |
| } |
| (*cx->hashobj->end)(cx->hashcx, final, &part, sizeof(final)); |
| switch (cx->key->keyType) { |
| case ecKey: |
| case dsaKey: |
| dsasig.len = checkedSignatureLen(cx->key); |
| if (dsasig.len == 0) { |
| return SECFailure; |
| } |
| if (dsasig.len > sizeof(cx->u)) { |
| PORT_SetError(SEC_ERROR_BAD_SIGNATURE); |
| return SECFailure; |
| } |
| dsasig.data = cx->u.buffer; |
| |
| if (sig) { |
| rv = decodeECorDSASignature(cx->encAlg, sig, dsasig.data, |
| dsasig.len); |
| if (rv != SECSuccess) { |
| PORT_SetError(SEC_ERROR_BAD_SIGNATURE); |
| return SECFailure; |
| } |
| } |
| hash.data = final; |
| hash.len = part; |
| if (PK11_Verify(cx->key, &dsasig, &hash, cx->wincx) != SECSuccess) { |
| PORT_SetError(SEC_ERROR_BAD_SIGNATURE); |
| return SECFailure; |
| } |
| break; |
| case rsaKey: |
| if (cx->encAlg == SEC_OID_PKCS1_RSA_PSS_SIGNATURE) { |
| CK_RSA_PKCS_PSS_PARAMS mech; |
| SECItem mechItem = { siBuffer, (unsigned char *)&mech, sizeof(mech) }; |
| PORTCheapArenaPool tmpArena; |
| |
| PORT_InitCheapArena(&tmpArena, DER_DEFAULT_CHUNKSIZE); |
| rv = sec_DecodeRSAPSSParamsToMechanism(&tmpArena.arena, |
| cx->params, |
| &mech); |
| PORT_DestroyCheapArena(&tmpArena); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| rsasig.data = cx->u.buffer; |
| rsasig.len = checkedSignatureLen(cx->key); |
| if (rsasig.len == 0) { |
| /* Error set by checkedSignatureLen */ |
| return SECFailure; |
| } |
| if (rsasig.len > sizeof(cx->u)) { |
| PORT_SetError(SEC_ERROR_BAD_SIGNATURE); |
| return SECFailure; |
| } |
| if (sig) { |
| if (sig->len != rsasig.len) { |
| PORT_SetError(SEC_ERROR_BAD_SIGNATURE); |
| return SECFailure; |
| } |
| PORT_Memcpy(rsasig.data, sig->data, rsasig.len); |
| } |
| hash.data = final; |
| hash.len = part; |
| if (PK11_VerifyWithMechanism(cx->key, CKM_RSA_PKCS_PSS, &mechItem, |
| &rsasig, &hash, cx->wincx) != SECSuccess) { |
| PORT_SetError(SEC_ERROR_BAD_SIGNATURE); |
| return SECFailure; |
| } |
| } else { |
| SECItem digest; |
| digest.data = final; |
| digest.len = part; |
| if (sig) { |
| SECOidTag hashid; |
| PORT_Assert(cx->hashAlg != SEC_OID_UNKNOWN); |
| rv = recoverPKCS1DigestInfo(cx->hashAlg, &hashid, |
| &cx->pkcs1RSADigestInfo, |
| &cx->pkcs1RSADigestInfoLen, |
| cx->key, |
| sig, cx->wincx); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| PORT_Assert(cx->hashAlg == hashid); |
| } |
| return verifyPKCS1DigestInfo(cx, &digest); |
| } |
| break; |
| default: |
| PORT_SetError(SEC_ERROR_BAD_SIGNATURE); |
| return SECFailure; /* shouldn't happen */ |
| } |
| return SECSuccess; |
| } |
| |
| SECStatus |
| VFY_End(VFYContext *cx) |
| { |
| return VFY_EndWithSignature(cx, NULL); |
| } |
| |
| /************************************************************************/ |
| /* |
| * Verify that a previously-computed digest matches a signature. |
| */ |
| static SECStatus |
| vfy_VerifyDigest(const SECItem *digest, const SECKEYPublicKey *key, |
| const SECItem *sig, SECOidTag encAlg, SECOidTag hashAlg, |
| void *wincx) |
| { |
| SECStatus rv; |
| VFYContext *cx; |
| SECItem dsasig; /* also used for ECDSA */ |
| rv = SECFailure; |
| |
| cx = vfy_CreateContext(key, sig, encAlg, hashAlg, NULL, wincx); |
| if (cx != NULL) { |
| switch (key->keyType) { |
| case rsaKey: |
| rv = verifyPKCS1DigestInfo(cx, digest); |
| /* Error (if any) set by verifyPKCS1DigestInfo */ |
| break; |
| case ecKey: |
| case dsaKey: |
| dsasig.data = cx->u.buffer; |
| dsasig.len = checkedSignatureLen(cx->key); |
| if (dsasig.len == 0) { |
| /* Error set by checkedSignatureLen */ |
| rv = SECFailure; |
| break; |
| } |
| if (dsasig.len > sizeof(cx->u)) { |
| PORT_SetError(SEC_ERROR_BAD_SIGNATURE); |
| rv = SECFailure; |
| break; |
| } |
| rv = PK11_Verify(cx->key, &dsasig, (SECItem *)digest, cx->wincx); |
| if (rv != SECSuccess) { |
| PORT_SetError(SEC_ERROR_BAD_SIGNATURE); |
| } |
| break; |
| default: |
| break; |
| } |
| VFY_DestroyContext(cx, PR_TRUE); |
| } |
| return rv; |
| } |
| |
| SECStatus |
| VFY_VerifyDigestDirect(const SECItem *digest, const SECKEYPublicKey *key, |
| const SECItem *sig, SECOidTag encAlg, |
| SECOidTag hashAlg, void *wincx) |
| { |
| return vfy_VerifyDigest(digest, key, sig, encAlg, hashAlg, wincx); |
| } |
| |
| SECStatus |
| VFY_VerifyDigest(SECItem *digest, SECKEYPublicKey *key, SECItem *sig, |
| SECOidTag algid, void *wincx) |
| { |
| SECOidTag encAlg, hashAlg; |
| SECStatus rv = sec_DecodeSigAlg(key, algid, NULL, &encAlg, &hashAlg); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| return vfy_VerifyDigest(digest, key, sig, encAlg, hashAlg, wincx); |
| } |
| |
| /* |
| * this function takes an optional hash oid, which the digest function |
| * will be compared with our target hash value. |
| */ |
| SECStatus |
| VFY_VerifyDigestWithAlgorithmID(const SECItem *digest, |
| const SECKEYPublicKey *key, const SECItem *sig, |
| const SECAlgorithmID *sigAlgorithm, |
| SECOidTag hashCmp, void *wincx) |
| { |
| SECOidTag encAlg, hashAlg; |
| SECStatus rv = sec_DecodeSigAlg(key, |
| SECOID_GetAlgorithmTag((SECAlgorithmID *)sigAlgorithm), |
| &sigAlgorithm->parameters, &encAlg, &hashAlg); |
| if (rv != SECSuccess) { |
| return rv; |
| } |
| if (hashCmp != SEC_OID_UNKNOWN && |
| hashAlg != SEC_OID_UNKNOWN && |
| hashCmp != hashAlg) { |
| PORT_SetError(SEC_ERROR_BAD_SIGNATURE); |
| return SECFailure; |
| } |
| return vfy_VerifyDigest(digest, key, sig, encAlg, hashAlg, wincx); |
| } |
| |
| static SECStatus |
| vfy_VerifyData(const unsigned char *buf, int len, const SECKEYPublicKey *key, |
| const SECItem *sig, SECOidTag encAlg, SECOidTag hashAlg, |
| const SECItem *params, SECOidTag *hash, void *wincx) |
| { |
| SECStatus rv; |
| VFYContext *cx; |
| |
| cx = vfy_CreateContext(key, sig, encAlg, hashAlg, hash, wincx); |
| if (cx == NULL) |
| return SECFailure; |
| if (params) { |
| cx->params = SECITEM_DupItem(params); |
| } |
| |
| rv = VFY_Begin(cx); |
| if (rv == SECSuccess) { |
| rv = VFY_Update(cx, (unsigned char *)buf, len); |
| if (rv == SECSuccess) |
| rv = VFY_End(cx); |
| } |
| |
| VFY_DestroyContext(cx, PR_TRUE); |
| return rv; |
| } |
| |
| SECStatus |
| VFY_VerifyDataDirect(const unsigned char *buf, int len, |
| const SECKEYPublicKey *key, const SECItem *sig, |
| SECOidTag encAlg, SECOidTag hashAlg, |
| SECOidTag *hash, void *wincx) |
| { |
| return vfy_VerifyData(buf, len, key, sig, encAlg, hashAlg, NULL, hash, wincx); |
| } |
| |
| SECStatus |
| VFY_VerifyData(const unsigned char *buf, int len, const SECKEYPublicKey *key, |
| const SECItem *sig, SECOidTag algid, void *wincx) |
| { |
| SECOidTag encAlg, hashAlg; |
| SECStatus rv = sec_DecodeSigAlg(key, algid, NULL, &encAlg, &hashAlg); |
| if (rv != SECSuccess) { |
| return rv; |
| } |
| return vfy_VerifyData(buf, len, key, sig, encAlg, hashAlg, NULL, NULL, wincx); |
| } |
| |
| SECStatus |
| VFY_VerifyDataWithAlgorithmID(const unsigned char *buf, int len, |
| const SECKEYPublicKey *key, |
| const SECItem *sig, |
| const SECAlgorithmID *sigAlgorithm, |
| SECOidTag *hash, void *wincx) |
| { |
| SECOidTag encAlg, hashAlg; |
| SECOidTag sigAlg = SECOID_GetAlgorithmTag((SECAlgorithmID *)sigAlgorithm); |
| SECStatus rv = sec_DecodeSigAlg(key, sigAlg, |
| &sigAlgorithm->parameters, &encAlg, &hashAlg); |
| if (rv != SECSuccess) { |
| return rv; |
| } |
| return vfy_VerifyData(buf, len, key, sig, encAlg, hashAlg, |
| &sigAlgorithm->parameters, hash, wincx); |
| } |