The Tor Browser: security/nss/lib/cryptohi/secsign.c@7e26c7da4463 (annotated)

security/nss/lib/cryptohi/secsign.c@7e26c7da4463 (annotated)

security/nss/lib/cryptohi/secsign.c

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /*
  * 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,
 , 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,
 , 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,
 , 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,
 , 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_SHA1_WITH_RSA_ENCRYPTION;
 	    break;
 	  case dsaKey:
 	    /* get Signature length (= q_len*2) and work from there */
 	    switch (PK11_SignatureLen(pk)) {
 		case 448:
 		    algID = SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST;
 		    break;
 		case 512:
 		    algID = SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST;
 		    break;
 		default:
 		    algID = SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST;
 		    break;
 	    }
 	    break;
 	  case ecKey:
 	    algID = SEC_OID_ANSIX962_ECDSA_SIGNATURE_WITH_SHA1_DIGEST;
 	    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);
     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_UNKNOWN:	/* default for RSA if not specified */
 	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_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_UNKNOWN:	/* default for DSA if not specified */
 	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_SHA256:
 	    sigTag = SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST; break;
 	default:
 	    break;
 	}
 	break;
     case ecKey:
 	switch (hashAlgTag) {
 	case SEC_OID_UNKNOWN:	/* default for ECDSA if not specified */
 	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_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;
 }

The Tor Browser / annotate

security/nss/lib/cryptohi/secsign.c@7e26c7da4463 (annotated)

security/nss/lib/cryptohi/secsign.c