osfmk/corecrypto/ccsha1/src/ccdigest_final_64be.c

   1 /*
   2  *  ccdigest_final_64be.c
   3  *  corecrypto
   4  *
   5  *  Created on 12/06/2010
   6  *
   7  *  Copyright (c) 2010,2011,2015 Apple Inc. All rights reserved.
   8  *
   9  *
  10  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  11  *
  12  * This file contains Original Code and/or Modifications of Original Code
  13  * as defined in and that are subject to the Apple Public Source License
  14  * Version 2.0 (the 'License'). You may not use this file except in
  15  * compliance with the License. The rights granted to you under the License
  16  * may not be used to create, or enable the creation or redistribution of,
  17  * unlawful or unlicensed copies of an Apple operating system, or to
  18  * circumvent, violate, or enable the circumvention or violation of, any
  19  * terms of an Apple operating system software license agreement.
  20  *
  21  * Please obtain a copy of the License at
  22  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  23  *
  24  * The Original Code and all software distributed under the License are
  25  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  26  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  27  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  28  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  29  * Please see the License for the specific language governing rights and
  30  * limitations under the License.
  31  *
  32  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  33  */
  34
  35 #include <corecrypto/ccdigest_priv.h>
  36 #include <corecrypto/cc_priv.h>
  37 #include "ccdigest_internal.h"
  38
  39 /* This can be used for SHA1, SHA256 and SHA224 */
  40 void ccdigest_final_64be(const struct ccdigest_info *di, ccdigest_ctx_t ctx,
  41                          unsigned char *digest) {
  42     ccdigest_nbits(di, ctx) += ccdigest_num(di, ctx) * 8;
  43     ccdigest_data(di, ctx)[ccdigest_num(di, ctx)++] = 0x80;
  44
  45     /* If we don't have at least 8 bytes (for the length) left we need to add
  46      a second block. */
  47     if (ccdigest_num(di, ctx) > 64 - 8) {
  48         while (ccdigest_num(di, ctx) < 64) {
  49             ccdigest_data(di, ctx)[ccdigest_num(di, ctx)++] = 0;
  50         }
  51         di->compress(ccdigest_state(di, ctx), 1, ccdigest_data(di, ctx));
  52         ccdigest_num(di, ctx) = 0;
  53     }
  54
  55     /* pad upto block_size minus 8 with 0s */
  56     while (ccdigest_num(di, ctx) < 64 - 8) {
  57         ccdigest_data(di, ctx)[ccdigest_num(di, ctx)++] = 0;
  58     }
  59
  60     CC_STORE64_BE(ccdigest_nbits(di, ctx), ccdigest_data(di, ctx) + 64 - 8);
  61     di->compress(ccdigest_state(di, ctx), 1, ccdigest_data(di, ctx));
  62
  63     /* copy output */
  64     for (unsigned int i = 0; i < di->output_size / 4; i++) {
  65         CC_STORE32_BE(ccdigest_state_u32(di, ctx)[i], digest+(4*i));
  66     }
  67 }