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
  11 #include <corecrypto/ccdigest_priv.h>
  12 #include <corecrypto/cc_priv.h>
  13
  14 /* This can be used for SHA1, SHA256 and SHA224 */
  15 void ccdigest_final_64be(const struct ccdigest_info *di, ccdigest_ctx_t ctx,
  16                          unsigned char *digest) {
  17     ccdigest_nbits(di, ctx) += ccdigest_num(di, ctx) * 8;
  18     ccdigest_data(di, ctx)[ccdigest_num(di, ctx)++] = 0x80;
  19
  20     /* If we don't have at least 8 bytes (for the length) left we need to add
  21      a second block. */
  22     if (ccdigest_num(di, ctx) > 64 - 8) {
  23         while (ccdigest_num(di, ctx) < 64) {
  24             ccdigest_data(di, ctx)[ccdigest_num(di, ctx)++] = 0;
  25         }
  26         di->compress(ccdigest_state(di, ctx), 1, ccdigest_data(di, ctx));
  27         ccdigest_num(di, ctx) = 0;
  28     }
  29
  30     /* pad upto block_size minus 8 with 0s */
  31     while (ccdigest_num(di, ctx) < 64 - 8) {
  32         ccdigest_data(di, ctx)[ccdigest_num(di, ctx)++] = 0;
  33     }
  34
  35     CC_STORE64_BE(ccdigest_nbits(di, ctx), ccdigest_data(di, ctx) + 64 - 8);
  36     di->compress(ccdigest_state(di, ctx), 1, ccdigest_data(di, ctx));
  37
  38     /* copy output */
  39     for (unsigned int i = 0; i < di->output_size / 4; i++) {
  40         CC_STORE32_BE(ccdigest_state_u32(di, ctx)[i], digest+(4*i));
  41     }
  42 }