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gecko-dev/security/nss/lib/cryptohi/secsign.c

512 строки
14 KiB
C
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/*
* Signature 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 "secder.h"
#include "keyhi.h"
#include "secoid.h"
#include "secdig.h"
#include "pk11func.h"
#include "secerr.h"
#include "keyi.h"
struct SGNContextStr {
SECOidTag signalg;
SECOidTag hashalg;
void *hashcx;
const SECHashObject *hashobj;
SECKEYPrivateKey *key;
};
SGNContext *
SGN_NewContext(SECOidTag alg, SECKEYPrivateKey *key)
{
SGNContext *cx;
SECOidTag hashalg, signalg;
KeyType keyType;
SECStatus rv;
/* OK, map a PKCS #7 hash and encrypt algorithm into
* a standard hashing algorithm. Why did we pass in the whole
* PKCS #7 algTag if we were just going to change here you might
* ask. Well the answer is for some cards we may have to do the
* hashing on card. It may not support CKM_RSA_PKCS sign algorithm,
* it may just support CKM_SHA1_RSA_PKCS and/or CKM_MD5_RSA_PKCS.
*/
/* we have a private key, not a public key, so don't pass it in */
rv = sec_DecodeSigAlg(NULL, alg, NULL, &signalg, &hashalg);
if (rv != SECSuccess) {
PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
return 0;
}
keyType = seckey_GetKeyType(signalg);
/* verify our key type */
if (key->keyType != keyType &&
!((key->keyType == dsaKey) && (keyType == fortezzaKey))) {
PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
return 0;
}
cx = (SGNContext *)PORT_ZAlloc(sizeof(SGNContext));
if (cx) {
cx->hashalg = hashalg;
cx->signalg = signalg;
cx->key = key;
}
return cx;
}
void
SGN_DestroyContext(SGNContext *cx, PRBool freeit)
{
if (cx) {
if (cx->hashcx != NULL) {
(*cx->hashobj->destroy)(cx->hashcx, PR_TRUE);
cx->hashcx = NULL;
}
if (freeit) {
PORT_ZFree(cx, sizeof(SGNContext));
}
}
}
SECStatus
SGN_Begin(SGNContext *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 already set */
cx->hashcx = (*cx->hashobj->create)();
if (cx->hashcx == NULL)
return SECFailure;
(*cx->hashobj->begin)(cx->hashcx);
return SECSuccess;
}
SECStatus
SGN_Update(SGNContext *cx, const unsigned char *input, unsigned int inputLen)
{
if (cx->hashcx == NULL) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
(*cx->hashobj->update)(cx->hashcx, input, inputLen);
return SECSuccess;
}
/* XXX Old template; want to expunge it eventually. */
static DERTemplate SECAlgorithmIDTemplate[] = {
{ DER_SEQUENCE,
0, NULL, sizeof(SECAlgorithmID) },
{ DER_OBJECT_ID,
offsetof(SECAlgorithmID, algorithm) },
{ DER_OPTIONAL | DER_ANY,
offsetof(SECAlgorithmID, parameters) },
{ 0 }
};
/*
* XXX OLD Template. Once all uses have been switched over to new one,
* remove this.
*/
static DERTemplate SGNDigestInfoTemplate[] = {
{ DER_SEQUENCE,
0, NULL, sizeof(SGNDigestInfo) },
{ DER_INLINE,
offsetof(SGNDigestInfo, digestAlgorithm),
SECAlgorithmIDTemplate },
{ DER_OCTET_STRING,
offsetof(SGNDigestInfo, digest) },
{ 0 }
};
SECStatus
SGN_End(SGNContext *cx, SECItem *result)
{
unsigned char digest[HASH_LENGTH_MAX];
unsigned part1;
int signatureLen;
SECStatus rv;
SECItem digder, sigitem;
PLArenaPool *arena = 0;
SECKEYPrivateKey *privKey = cx->key;
SGNDigestInfo *di = 0;
result->data = 0;
digder.data = 0;
/* Finish up digest function */
if (cx->hashcx == NULL) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
(*cx->hashobj->end)(cx->hashcx, digest, &part1, sizeof(digest));
if (privKey->keyType == rsaKey) {
arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
if (!arena) {
rv = SECFailure;
goto loser;
}
/* Construct digest info */
di = SGN_CreateDigestInfo(cx->hashalg, digest, part1);
if (!di) {
rv = SECFailure;
goto loser;
}
/* Der encode the digest as a DigestInfo */
rv = DER_Encode(arena, &digder, SGNDigestInfoTemplate,
di);
if (rv != SECSuccess) {
goto loser;
}
} else {
digder.data = digest;
digder.len = part1;
}
/*
** Encrypt signature after constructing appropriate PKCS#1 signature
** block
*/
signatureLen = PK11_SignatureLen(privKey);
if (signatureLen <= 0) {
PORT_SetError(SEC_ERROR_INVALID_KEY);
rv = SECFailure;
goto loser;
}
sigitem.len = signatureLen;
sigitem.data = (unsigned char *)PORT_Alloc(signatureLen);
if (sigitem.data == NULL) {
rv = SECFailure;
goto loser;
}
rv = PK11_Sign(privKey, &sigitem, &digder);
if (rv != SECSuccess) {
PORT_Free(sigitem.data);
sigitem.data = NULL;
goto loser;
}
if ((cx->signalg == SEC_OID_ANSIX9_DSA_SIGNATURE) ||
(cx->signalg == SEC_OID_ANSIX962_EC_PUBLIC_KEY)) {
/* DSAU_EncodeDerSigWithLen works for DSA and ECDSA */
rv = DSAU_EncodeDerSigWithLen(result, &sigitem, sigitem.len);
PORT_Free(sigitem.data);
if (rv != SECSuccess)
goto loser;
} else {
result->len = sigitem.len;
result->data = sigitem.data;
}
loser:
SGN_DestroyDigestInfo(di);
if (arena != NULL) {
PORT_FreeArena(arena, PR_FALSE);
}
return rv;
}
/************************************************************************/
/*
** Sign a block of data returning in result a bunch of bytes that are the
** signature. Returns zero on success, an error code on failure.
*/
SECStatus
SEC_SignData(SECItem *res, const unsigned char *buf, int len,
SECKEYPrivateKey *pk, SECOidTag algid)
{
SECStatus rv;
SGNContext *sgn;
sgn = SGN_NewContext(algid, pk);
if (sgn == NULL)
return SECFailure;
rv = SGN_Begin(sgn);
if (rv != SECSuccess)
goto loser;
rv = SGN_Update(sgn, buf, len);
if (rv != SECSuccess)
goto loser;
rv = SGN_End(sgn, res);
loser:
SGN_DestroyContext(sgn, PR_TRUE);
return rv;
}
/************************************************************************/
DERTemplate CERTSignedDataTemplate[] =
{
{ DER_SEQUENCE,
0, NULL, sizeof(CERTSignedData) },
{ DER_ANY,
offsetof(CERTSignedData, data) },
{ DER_INLINE,
offsetof(CERTSignedData, signatureAlgorithm),
SECAlgorithmIDTemplate },
{ DER_BIT_STRING,
offsetof(CERTSignedData, signature) },
{ 0 }
};
SEC_ASN1_MKSUB(SECOID_AlgorithmIDTemplate)
const SEC_ASN1Template CERT_SignedDataTemplate[] =
{
{ SEC_ASN1_SEQUENCE,
0, NULL, sizeof(CERTSignedData) },
{ SEC_ASN1_ANY,
offsetof(CERTSignedData, data) },
{ SEC_ASN1_INLINE | SEC_ASN1_XTRN,
offsetof(CERTSignedData, signatureAlgorithm),
SEC_ASN1_SUB(SECOID_AlgorithmIDTemplate) },
{ SEC_ASN1_BIT_STRING,
offsetof(CERTSignedData, signature) },
{ 0 }
};
SEC_ASN1_CHOOSER_IMPLEMENT(CERT_SignedDataTemplate)
SECStatus
SEC_DerSignData(PLArenaPool *arena, SECItem *result,
const unsigned char *buf, int len, SECKEYPrivateKey *pk,
SECOidTag algID)
{
SECItem it;
CERTSignedData sd;
SECStatus rv;
it.data = 0;
/* XXX We should probably have some asserts here to make sure the key type
* and algID match
*/
if (algID == SEC_OID_UNKNOWN) {
switch (pk->keyType) {
case rsaKey:
algID = SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION;
break;
case dsaKey:
/* get Signature length (= q_len*2) and work from there */
switch (PK11_SignatureLen(pk)) {
case 320:
algID = SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST;
break;
case 448:
algID = SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST;
break;
case 512:
default:
algID = SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST;
break;
}
break;
case ecKey:
algID = SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE;
break;
default:
PORT_SetError(SEC_ERROR_INVALID_KEY);
return SECFailure;
}
}
/* Sign input buffer */
rv = SEC_SignData(&it, buf, len, pk, algID);
if (rv)
goto loser;
/* Fill out SignedData object */
PORT_Memset(&sd, 0, sizeof(sd));
sd.data.data = (unsigned char *)buf;
sd.data.len = len;
sd.signature.data = it.data;
sd.signature.len = it.len << 3; /* convert to bit string */
rv = SECOID_SetAlgorithmID(arena, &sd.signatureAlgorithm, algID, 0);
if (rv)
goto loser;
/* DER encode the signed data object */
rv = DER_Encode(arena, result, CERTSignedDataTemplate, &sd);
/* FALL THROUGH */
loser:
PORT_Free(it.data);
return rv;
}
SECStatus
SGN_Digest(SECKEYPrivateKey *privKey,
SECOidTag algtag, SECItem *result, SECItem *digest)
{
int modulusLen;
SECStatus rv;
SECItem digder;
PLArenaPool *arena = 0;
SGNDigestInfo *di = 0;
result->data = 0;
if (privKey->keyType == rsaKey) {
arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
if (!arena) {
rv = SECFailure;
goto loser;
}
/* Construct digest info */
di = SGN_CreateDigestInfo(algtag, digest->data, digest->len);
if (!di) {
rv = SECFailure;
goto loser;
}
/* Der encode the digest as a DigestInfo */
rv = DER_Encode(arena, &digder, SGNDigestInfoTemplate,
di);
if (rv != SECSuccess) {
goto loser;
}
} else {
digder.data = digest->data;
digder.len = digest->len;
}
/*
** Encrypt signature after constructing appropriate PKCS#1 signature
** block
*/
modulusLen = PK11_SignatureLen(privKey);
if (modulusLen <= 0) {
PORT_SetError(SEC_ERROR_INVALID_KEY);
rv = SECFailure;
goto loser;
}
result->len = modulusLen;
result->data = (unsigned char *)PORT_Alloc(modulusLen);
result->type = siBuffer;
if (result->data == NULL) {
rv = SECFailure;
goto loser;
}
rv = PK11_Sign(privKey, result, &digder);
if (rv != SECSuccess) {
PORT_Free(result->data);
result->data = NULL;
}
loser:
SGN_DestroyDigestInfo(di);
if (arena != NULL) {
PORT_FreeArena(arena, PR_FALSE);
}
return rv;
}
SECOidTag
SEC_GetSignatureAlgorithmOidTag(KeyType keyType, SECOidTag hashAlgTag)
{
SECOidTag sigTag = SEC_OID_UNKNOWN;
switch (keyType) {
case rsaKey:
switch (hashAlgTag) {
case SEC_OID_MD2:
sigTag = SEC_OID_PKCS1_MD2_WITH_RSA_ENCRYPTION;
break;
case SEC_OID_MD5:
sigTag = SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION;
break;
case SEC_OID_SHA1:
sigTag = SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION;
break;
case SEC_OID_SHA224:
sigTag = SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION;
break;
case SEC_OID_UNKNOWN: /* default for RSA if not specified */
case SEC_OID_SHA256:
sigTag = SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION;
break;
case SEC_OID_SHA384:
sigTag = SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION;
break;
case SEC_OID_SHA512:
sigTag = SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION;
break;
default:
break;
}
break;
case dsaKey:
switch (hashAlgTag) {
case SEC_OID_SHA1:
sigTag = SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST;
break;
case SEC_OID_SHA224:
sigTag = SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST;
break;
case SEC_OID_UNKNOWN: /* default for DSA if not specified */
case SEC_OID_SHA256:
sigTag = SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST;
break;
default:
break;
}
break;
case ecKey:
switch (hashAlgTag) {
case SEC_OID_SHA1:
sigTag = SEC_OID_ANSIX962_ECDSA_SHA1_SIGNATURE;
break;
case SEC_OID_SHA224:
sigTag = SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE;
break;
case SEC_OID_UNKNOWN: /* default for ECDSA if not specified */
case SEC_OID_SHA256:
sigTag = SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE;
break;
case SEC_OID_SHA384:
sigTag = SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE;
break;
case SEC_OID_SHA512:
sigTag = SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE;
break;
default:
break;
}
default:
break;
}
return sigTag;
}
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