RetroZilla/security/nss/lib/cryptohi/secvfy.c

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2015-10-21 05:03:22 +02:00
/*
* Verification stuff.
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1994-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Dr Vipul Gupta <vipul.gupta@sun.com>, Sun Microsystems Laboratories
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* $Id: secvfy.c,v 1.22 2008/02/28 04:27:36 nelson%bolyard.com Exp $ */
#include <stdio.h>
#include "cryptohi.h"
#include "sechash.h"
#include "keyhi.h"
#include "secasn1.h"
#include "secoid.h"
#include "pk11func.h"
#include "secdig.h"
#include "secerr.h"
#include "keyi.h"
/*
** Decrypt signature block using public key
** Store the hash algorithm oid tag in *tagp
** Store the digest in the digest buffer
** Store the digest length in *digestlen
** XXX this is assuming that the signature algorithm has WITH_RSA_ENCRYPTION
*/
static SECStatus
DecryptSigBlock(SECOidTag *tagp, unsigned char *digest,
unsigned int *digestlen, unsigned int maxdigestlen,
SECKEYPublicKey *key, const SECItem *sig, char *wincx)
{
SGNDigestInfo *di = NULL;
unsigned char *buf = NULL;
SECStatus rv;
SECOidTag tag;
SECItem it;
if (key == NULL) goto loser;
it.len = SECKEY_PublicKeyStrength(key);
if (!it.len) goto loser;
it.data = buf = (unsigned char *)PORT_Alloc(it.len);
if (!buf) goto loser;
/* decrypt the block */
rv = PK11_VerifyRecover(key, (SECItem *)sig, &it, wincx);
if (rv != SECSuccess) goto loser;
di = SGN_DecodeDigestInfo(&it);
if (di == NULL) goto sigloser;
/*
** Finally we have the digest info; now we can extract the algorithm
** ID and the signature block
*/
tag = SECOID_GetAlgorithmTag(&di->digestAlgorithm);
/* Check that tag is an appropriate algorithm */
if (tag == SEC_OID_UNKNOWN) {
goto sigloser;
}
/* make sure the "parameters" are not too bogus. */
if (di->digestAlgorithm.parameters.len > 2) {
goto sigloser;
}
if (di->digest.len > maxdigestlen) {
PORT_SetError(SEC_ERROR_OUTPUT_LEN);
goto loser;
}
PORT_Memcpy(digest, di->digest.data, di->digest.len);
*tagp = tag;
*digestlen = di->digest.len;
goto done;
sigloser:
PORT_SetError(SEC_ERROR_BAD_SIGNATURE);
loser:
rv = SECFailure;
done:
if (di != NULL) SGN_DestroyDigestInfo(di);
if (buf != NULL) PORT_Free(buf);
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 digest in the decrypted RSA signature */
unsigned char rsadigest[HASH_LENGTH_MAX];
/* the full DSA signature... 40 bytes */
unsigned char dsasig[DSA_SIGNATURE_LEN];
/* the full ECDSA signature */
unsigned char ecdsasig[2 * MAX_ECKEY_LEN];
} u;
unsigned int rsadigestlen;
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. */
};
/*
* 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 */
SECStatus rv=SECSuccess;
if ((algid != SEC_OID_ANSIX9_DSA_SIGNATURE) &&
(algid != SEC_OID_ANSIX962_EC_PUBLIC_KEY) ) {
if (sig->len != len) {
PORT_SetError(SEC_ERROR_BAD_DER);
return SECFailure;
}
PORT_Memcpy(dsig, sig->data, sig->len);
return SECSuccess;
}
if (algid == SEC_OID_ANSIX962_EC_PUBLIC_KEY) {
if (len > MAX_ECKEY_LEN * 2) {
PORT_SetError(SEC_ERROR_BAD_DER);
return SECFailure;
}
}
dsasig = DSAU_DecodeDerSigToLen((SECItem *)sig, len);
if ((dsasig == NULL) || (dsasig->len != len)) {
rv = SECFailure;
} else {
PORT_Memcpy(dsig, dsasig->data, dsasig->len);
}
if (dsasig != NULL) SECITEM_FreeItem(dsasig, PR_TRUE);
if (rv == SECFailure) PORT_SetError(SEC_ERROR_BAD_DER);
return rv;
}
const SEC_ASN1Template hashParameterTemplate[] =
{
{ SEC_ASN1_SEQUENCE, 0, NULL, sizeof(SECItem) },
{ SEC_ASN1_OBJECT_ID, 0 },
{ SEC_ASN1_SKIP_REST },
{ 0, }
};
/*
* 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 *encalg, SECOidTag *hashalg)
{
int len;
PRArenaPool *arena;
SECStatus rv;
SECItem oid;
PR_ASSERT(hashalg!=NULL);
PR_ASSERT(encalg!=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_ANSIX962_ECDSA_SHA256_SIGNATURE:
case SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION:
*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 */
/* SHA 224 not supported in NSS */
PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
return SECFailure;
} 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) {
PORT_FreeArena(arena, PR_FALSE);
return rv;
}
*hashalg = SECOID_FindOIDTag(&oid);
/* 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;
}
/* 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_SHA256_WITH_RSA_ENCRYPTION:
case SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION:
case SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION:
*encalg = SEC_OID_PKCS1_RSA_ENCRYPTION;
break;
/* what about normal DSA? */
case SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST:
case SEC_OID_BOGUS_DSA_SIGNATURE_WITH_SHA1_DIGEST:
*encalg = SEC_OID_ANSIX9_DSA_SIGNATURE;
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:
*encalg = SEC_OID_MISSI_DSS;
break;
case SEC_OID_ANSIX962_ECDSA_SHA1_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:
*encalg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
break;
/* we don't implement MD4 hashes */
case SEC_OID_PKCS1_MD4_WITH_RSA_ENCRYPTION:
default:
PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
return SECFailure;
}
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;
/* make sure the encryption algorithm matches the key type */
type = seckey_GetKeyType(encAlg);
if (key->keyType != type) {
PORT_SetError(SEC_ERROR_PKCS7_KEYALG_MISMATCH);
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);
rv = SECSuccess;
if (sig) {
switch (key->keyType) {
case rsaKey:
rv = DecryptSigBlock(&cx->hashAlg, cx->u.buffer, &cx->rsadigestlen,
HASH_LENGTH_MAX, cx->key, sig, (char*)wincx);
if (cx->hashAlg != hashAlg && hashAlg != SEC_OID_UNKNOWN) {
PORT_SetError(SEC_ERROR_BAD_SIGNATURE);
rv = SECFailure;
}
break;
case dsaKey:
case ecKey:
sigLen = SECKEY_SignatureLen(key);
if (sigLen == 0) {
/* error set by SECKEY_SignatureLen */
rv = SECFailure;
break;
}
rv = decodeECorDSASignature(encAlg, sig, cx->u.buffer, sigLen);
break;
default:
rv = SECFailure;
PORT_SetError(SEC_ERROR_UNSUPPORTED_KEYALG);
break;
}
}
if (rv) 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;
}
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)
{
SECOidTag encAlg, hashAlg;
SECStatus rv = sec_DecodeSigAlg(key,
SECOID_GetAlgorithmTag((SECAlgorithmID *)sigAlgorithm),
&sigAlgorithm->parameters, &encAlg, &hashAlg);
if (rv != SECSuccess) {
return NULL;
}
return vfy_CreateContext(key, sig, encAlg, hashAlg, hash, wincx);
}
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 (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,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.data = cx->u.buffer;
dsasig.len = SECKEY_SignatureLen(cx->key);
if (dsasig.len == 0) {
return SECFailure;
}
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 (sig) {
SECOidTag hashid = SEC_OID_UNKNOWN;
rv = DecryptSigBlock(&hashid, cx->u.buffer, &cx->rsadigestlen,
HASH_LENGTH_MAX, cx->key, sig, (char*)cx->wincx);
if ((rv != SECSuccess) || (hashid != cx->hashAlg)) {
PORT_SetError(SEC_ERROR_BAD_SIGNATURE);
return SECFailure;
}
}
if ((part != cx->rsadigestlen) ||
PORT_Memcmp(final, cx->u.buffer, part)) {
PORT_SetError(SEC_ERROR_BAD_SIGNATURE);
return SECFailure;
}
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:
if ((digest->len != cx->rsadigestlen) ||
PORT_Memcmp(digest->data, cx->u.buffer, digest->len)) {
PORT_SetError(SEC_ERROR_BAD_SIGNATURE);
} else {
rv = SECSuccess;
}
break;
case dsaKey:
case ecKey:
dsasig.data = cx->u.buffer;
dsasig.len = SECKEY_SignatureLen(cx->key);
if (dsasig.len == 0) {
break;
}
if (PK11_Verify(cx->key, &dsasig, (SECItem *)digest, cx->wincx)
!= SECSuccess) {
PORT_SetError(SEC_ERROR_BAD_SIGNATURE);
} else {
rv = SECSuccess;
}
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,
SECOidTag *hash, void *wincx)
{
SECStatus rv;
VFYContext *cx;
cx = vfy_CreateContext(key, sig, encAlg, hashAlg, hash, wincx);
if (cx == NULL)
return SECFailure;
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, hash, wincx);
}
SECStatus
VFY_VerifyData(unsigned char *buf, int len, SECKEYPublicKey *key,
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, 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, hash, wincx);
}