git.saurik.com Git - apple/xnu.git/blob - osfmk/corecrypto/ccdigest_final

1 /*

2 * ccdigest_final_64be.c

3 * corecrypto

4 *

5 * Created on 12/06/2010

6 *

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 */

35 #include <corecrypto/ccdigest_priv.h>

36 #include <corecrypto/cc_priv.h>

37 #include "ccdigest_internal.h"

39 /* This can be used for SHA1, SHA256 and SHA224 */

40 void

 ccdigest_final_64be(const struct ccdigest_info *di, ccdigest_ctx_t ctx, unsigned char *digest)

42 {

43 // Sanity check to recover from ctx corruptions.

         if (ccdigest_num(di, ctx) >= di->block_size) {

                 ccdigest_num(di, ctx) = 0;

46 }

48 // Clone the state.

49 ccdigest_di_decl(di, tmp);

         cc_memcpy(tmp, ctx, ccdigest_di_size(di));

         ccdigest_nbits(di, tmp) += ccdigest_num(di, tmp) * 8;

         ccdigest_data(di, tmp)[ccdigest_num(di, tmp)++] = 0x80;

55 /* If we don't have at least 8 bytes (for the length) left we need to add

56 * a second block. */

         if (ccdigest_num(di, tmp) > 64 - 8) {

                 while (ccdigest_num(di, tmp) < 64) {

                         ccdigest_data(di, tmp)[ccdigest_num(di, tmp)++] = 0;

60 }

                 di->compress(ccdigest_state(di, tmp), 1, ccdigest_data(di, tmp));

                 ccdigest_num(di, tmp) = 0;

63 }

65 /* pad upto block_size minus 8 with 0s */

         while (ccdigest_num(di, tmp) < 64 - 8) {

                 ccdigest_data(di, tmp)[ccdigest_num(di, tmp)++] = 0;

68 }

         CC_STORE64_BE(ccdigest_nbits(di, tmp), ccdigest_data(di, tmp) + 64 - 8);

         di->compress(ccdigest_state(di, tmp), 1, ccdigest_data(di, tmp));

73 /* copy output */

         for (unsigned int i = 0; i < di->output_size / 4; i++) {

                 CC_STORE32_BE(ccdigest_state_u32(di, tmp)[i], digest + (4 * i));

76 }

78 ccdigest_di_clear(di, tmp);

79 }