mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-11-11 02:10:17 +01:00
98d377b37b
bug920719, bug1026148, bug1028647, bug963150, bug1030486, bug1025729, bug836658, bug1028582, bug1038728, bug1038526, bug1042634, bug1047210, bug1043891, bug1043108, bug1046735, bug1043082, bug1036735, bug1046718, bug1050107, bug1054625, bug1057465, bug1057476, bug1041326, bug1058933, bug1064636, bug1057161, bug1078669, bug1049435, bug1070493, bug1083360, bug1028764, bug1065990, bug1073330, bug1064670, bug1094650
170 lines
5.1 KiB
C
170 lines
5.1 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include "pkcs1sig.h"
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#include "hasht.h"
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#include "secerr.h"
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#include "secasn1t.h"
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#include "secoid.h"
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typedef struct pkcs1PrefixStr pkcs1Prefix;
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struct pkcs1PrefixStr {
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unsigned int len;
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PRUint8 *data;
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};
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typedef struct pkcs1PrefixesStr pkcs1Prefixes;
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struct pkcs1PrefixesStr {
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unsigned int digestLen;
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pkcs1Prefix prefixWithParams;
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pkcs1Prefix prefixWithoutParams;
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};
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/* The value for SGN_PKCS1_DIGESTINFO_MAX_PREFIX_LEN_EXCLUDING_OID is based on
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* the possible prefix encodings as explained below.
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*/
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#define MAX_PREFIX_LEN_EXCLUDING_OID 10
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static SECStatus
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encodePrefix(const SECOidData *hashOid, unsigned int digestLen,
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pkcs1Prefix *prefix, PRBool withParams)
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{
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/* with params coding is:
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* Sequence (2 bytes) {
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* Sequence (2 bytes) {
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* Oid (2 bytes) {
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* Oid value (derOid->oid.len)
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* }
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* NULL (2 bytes)
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* }
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* OCTECT (2 bytes);
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*
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* without params coding is:
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* Sequence (2 bytes) {
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* Sequence (2 bytes) {
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* Oid (2 bytes) {
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* Oid value (derOid->oid.len)
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* }
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* }
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* OCTECT (2 bytes);
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*/
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unsigned int innerSeqLen = 2 + hashOid->oid.len;
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unsigned int outerSeqLen = 2 + innerSeqLen + 2 + digestLen;
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unsigned int extra = 0;
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if (withParams) {
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innerSeqLen += 2;
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outerSeqLen += 2;
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extra = 2;
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}
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if (innerSeqLen >= 128 ||
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outerSeqLen >= 128 ||
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(outerSeqLen + 2 - digestLen) >
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(MAX_PREFIX_LEN_EXCLUDING_OID + hashOid->oid.len)) {
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/* this is actually a library failure, It shouldn't happen */
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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prefix->len = 6 + hashOid->oid.len + extra + 2;
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prefix->data = PORT_Alloc(prefix->len);
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if (!prefix->data) {
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PORT_SetError(SEC_ERROR_NO_MEMORY);
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return SECFailure;
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}
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prefix->data[0] = SEC_ASN1_SEQUENCE|SEC_ASN1_CONSTRUCTED;
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prefix->data[1] = outerSeqLen;
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prefix->data[2] = SEC_ASN1_SEQUENCE|SEC_ASN1_CONSTRUCTED;
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prefix->data[3] = innerSeqLen;
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prefix->data[4] = SEC_ASN1_OBJECT_ID;
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prefix->data[5] = hashOid->oid.len;
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PORT_Memcpy(&prefix->data[6], hashOid->oid.data, hashOid->oid.len);
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if (withParams) {
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prefix->data[6 + hashOid->oid.len] = SEC_ASN1_NULL;
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prefix->data[6 + hashOid->oid.len + 1] = 0;
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}
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prefix->data[6 + hashOid->oid.len + extra] = SEC_ASN1_OCTET_STRING;
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prefix->data[6 + hashOid->oid.len + extra + 1] = digestLen;
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return SECSuccess;
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}
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SECStatus
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_SGN_VerifyPKCS1DigestInfo(SECOidTag digestAlg,
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const SECItem* digest,
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const SECItem* dataRecoveredFromSignature,
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PRBool unsafeAllowMissingParameters)
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{
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SECOidData *hashOid;
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pkcs1Prefixes pp;
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const pkcs1Prefix* expectedPrefix;
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SECStatus rv, rv2, rv3;
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if (!digest || !digest->data ||
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!dataRecoveredFromSignature || !dataRecoveredFromSignature->data) {
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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hashOid = SECOID_FindOIDByTag(digestAlg);
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if (hashOid == NULL) {
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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pp.digestLen = digest->len;
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pp.prefixWithParams.data = NULL;
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pp.prefixWithoutParams.data = NULL;
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rv2 = encodePrefix(hashOid, pp.digestLen, &pp.prefixWithParams, PR_TRUE);
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rv3 = encodePrefix(hashOid, pp.digestLen, &pp.prefixWithoutParams, PR_FALSE);
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rv = SECSuccess;
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if (rv2 != SECSuccess || rv3 != SECSuccess) {
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rv = SECFailure;
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}
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if (rv == SECSuccess) {
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/* We don't attempt to avoid timing attacks on these comparisons because
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* signature verification is a public key operation, not a private key
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* operation.
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*/
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if (dataRecoveredFromSignature->len ==
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pp.prefixWithParams.len + pp.digestLen) {
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expectedPrefix = &pp.prefixWithParams;
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} else if (unsafeAllowMissingParameters &&
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dataRecoveredFromSignature->len ==
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pp.prefixWithoutParams.len + pp.digestLen) {
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expectedPrefix = &pp.prefixWithoutParams;
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} else {
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PORT_SetError(SEC_ERROR_BAD_SIGNATURE);
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rv = SECFailure;
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}
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}
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if (rv == SECSuccess) {
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if (memcmp(dataRecoveredFromSignature->data, expectedPrefix->data,
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expectedPrefix->len) ||
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memcmp(dataRecoveredFromSignature->data + expectedPrefix->len,
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digest->data, digest->len)) {
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PORT_SetError(SEC_ERROR_BAD_SIGNATURE);
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rv = SECFailure;
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}
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}
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if (pp.prefixWithParams.data) {
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PORT_Free(pp.prefixWithParams.data);
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}
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if (pp.prefixWithoutParams.data) {
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PORT_Free(pp.prefixWithoutParams.data);
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}
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return rv;
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}
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