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      1 /*
      2  * Signature stuff.
      3  *
      4  * ***** BEGIN LICENSE BLOCK *****
      5  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
      6  *
      7  * The contents of this file are subject to the Mozilla Public License Version
      8  * 1.1 (the "License"); you may not use this file except in compliance with
      9  * the License. You may obtain a copy of the License at
     10  * http://www.mozilla.org/MPL/
     11  *
     12  * Software distributed under the License is distributed on an "AS IS" basis,
     13  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
     14  * for the specific language governing rights and limitations under the
     15  * License.
     16  *
     17  * The Original Code is the Netscape security libraries.
     18  *
     19  * The Initial Developer of the Original Code is
     20  * Netscape Communications Corporation.
     21  * Portions created by the Initial Developer are Copyright (C) 1994-2000
     22  * the Initial Developer. All Rights Reserved.
     23  *
     24  * Contributor(s):
     25  *   Dr Vipul Gupta <vipul.gupta (at) sun.com>, Sun Microsystems Laboratories
     26  *
     27  * Alternatively, the contents of this file may be used under the terms of
     28  * either the GNU General Public License Version 2 or later (the "GPL"), or
     29  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
     30  * in which case the provisions of the GPL or the LGPL are applicable instead
     31  * of those above. If you wish to allow use of your version of this file only
     32  * under the terms of either the GPL or the LGPL, and not to allow others to
     33  * use your version of this file under the terms of the MPL, indicate your
     34  * decision by deleting the provisions above and replace them with the notice
     35  * and other provisions required by the GPL or the LGPL. If you do not delete
     36  * the provisions above, a recipient may use your version of this file under
     37  * the terms of any one of the MPL, the GPL or the LGPL.
     38  *
     39  * ***** END LICENSE BLOCK ***** */
     40 
     41 #include "crypto/third_party/nss/chromium-nss.h"
     42 
     43 #include <vector>
     44 
     45 #include <cryptohi.h>
     46 #include <pk11pub.h>
     47 #include <secerr.h>
     48 #include <sechash.h>
     49 #include <stdint.h>
     50 
     51 #include "base/logging.h"
     52 #include "build/build_config.h"
     53 
     54 SECStatus DerSignData(PLArenaPool *arena,
     55                       SECItem *result,
     56                       SECItem *input,
     57                       SECKEYPrivateKey *key,
     58                       SECOidTag algo_id) {
     59   if (key->keyType != ecKey) {
     60     return SEC_DerSignData(arena, result, input->data, input->len, key,
     61                            algo_id);
     62   }
     63 
     64   // NSS has a private function sec_DecodeSigAlg it uses to figure out the
     65   // correct hash from the algorithm id.
     66   HASH_HashType hash_type;
     67   switch (algo_id) {
     68     case SEC_OID_ANSIX962_ECDSA_SHA1_SIGNATURE:
     69       hash_type = HASH_AlgSHA1;
     70       break;
     71 #ifdef SHA224_LENGTH
     72     case SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE:
     73       hash_type = HASH_AlgSHA224;
     74       break;
     75 #endif
     76     case SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE:
     77       hash_type = HASH_AlgSHA256;
     78       break;
     79     case SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE:
     80       hash_type = HASH_AlgSHA384;
     81       break;
     82     case SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE:
     83       hash_type = HASH_AlgSHA512;
     84       break;
     85     default:
     86       PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
     87       return SECFailure;
     88   }
     89 
     90   // Hash the input.
     91   std::vector<uint8_t> hash_data(HASH_ResultLen(hash_type));
     92   SECStatus rv = HASH_HashBuf(
     93       hash_type, &hash_data[0], input->data, input->len);
     94   if (rv != SECSuccess)
     95     return rv;
     96   SECItem hash = {siBuffer, &hash_data[0],
     97 		  static_cast<unsigned int>(hash_data.size())};
     98 
     99   // Compute signature of hash.
    100   int signature_len = PK11_SignatureLen(key);
    101   std::vector<uint8_t> signature_data(signature_len);
    102   SECItem sig = {siBuffer, &signature_data[0],
    103 		 static_cast<unsigned int>(signature_len)};
    104   rv = PK11_Sign(key, &sig, &hash);
    105   if (rv != SECSuccess)
    106     return rv;
    107 
    108   CERTSignedData sd;
    109   PORT_Memset(&sd, 0, sizeof(sd));
    110   // Fill in tbsCertificate.
    111   sd.data.data = (unsigned char*) input->data;
    112   sd.data.len = input->len;
    113 
    114   // Fill in signatureAlgorithm.
    115   rv = SECOID_SetAlgorithmID(arena, &sd.signatureAlgorithm, algo_id, 0);
    116   if (rv != SECSuccess)
    117     return rv;
    118 
    119   // Fill in signatureValue.
    120   rv = DSAU_EncodeDerSigWithLen(&sd.signature, &sig, sig.len);
    121   if (rv != SECSuccess)
    122     return rv;
    123   sd.signature.len <<=  3;  // Convert to bit string.
    124 
    125   // DER encode the signed data object.
    126   void* encode_result = SEC_ASN1EncodeItem(
    127       arena, result, &sd, SEC_ASN1_GET(CERT_SignedDataTemplate));
    128 
    129   PORT_Free(sd.signature.data);
    130 
    131   return encode_result ? SECSuccess : SECFailure;
    132 }
    133