src/crypto/sha384-internal.c

   1 /*
   2  * SHA-384 hash implementation and interface functions
   3  * Copyright (c) 2015, Pali Rohár <pali.rohar@gmail.com>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "sha384_i.h"
  13 #include "crypto.h"
  14
  15
  16 /**
  17  * sha384_vector - SHA384 hash for data vector
  18  * @num_elem: Number of elements in the data vector
  19  * @addr: Pointers to the data areas
  20  * @len: Lengths of the data blocks
  21  * @mac: Buffer for the hash
  22  * Returns: 0 on success, -1 of failure
  23  */
  24 int sha384_vector(size_t num_elem, const u8 *addr[], const size_t *len,
  25                   u8 *mac)
  26 {
  27         struct sha384_state ctx;
  28         size_t i;
  29
  30         sha384_init(&ctx);
  31         for (i = 0; i < num_elem; i++)
  32                 if (sha384_process(&ctx, addr[i], len[i]))
  33                         return -1;
  34         if (sha384_done(&ctx, mac))
  35                 return -1;
  36         return 0;
  37 }
  38
  39
  40 /* ===== start - public domain SHA384 implementation ===== */
  41
  42 /* This is based on SHA384 implementation in LibTomCrypt that was released into
  43  * public domain by Tom St Denis. */
  44
  45 #define CONST64(n) n ## ULL
  46
  47 /**
  48    Initialize the hash state
  49    @param md   The hash state you wish to initialize
  50    @return CRYPT_OK if successful
  51 */
  52 void sha384_init(struct sha384_state *md)
  53 {
  54         md->curlen = 0;
  55         md->length = 0;
  56         md->state[0] = CONST64(0xcbbb9d5dc1059ed8);
  57         md->state[1] = CONST64(0x629a292a367cd507);
  58         md->state[2] = CONST64(0x9159015a3070dd17);
  59         md->state[3] = CONST64(0x152fecd8f70e5939);
  60         md->state[4] = CONST64(0x67332667ffc00b31);
  61         md->state[5] = CONST64(0x8eb44a8768581511);
  62         md->state[6] = CONST64(0xdb0c2e0d64f98fa7);
  63         md->state[7] = CONST64(0x47b5481dbefa4fa4);
  64 }
  65
  66 int sha384_process(struct sha384_state *md, const unsigned char *in,
  67                    unsigned long inlen)
  68 {
  69         return sha512_process(md, in, inlen);
  70 }
  71
  72 /**
  73    Terminate the hash to get the digest
  74    @param md  The hash state
  75    @param out [out] The destination of the hash (48 bytes)
  76    @return CRYPT_OK if successful
  77 */
  78 int sha384_done(struct sha384_state *md, unsigned char *out)
  79 {
  80         unsigned char buf[64];
  81
  82         if (md->curlen >= sizeof(md->buf))
  83                 return -1;
  84
  85         if (sha512_done(md, buf) != 0)
  86                 return -1;
  87
  88         os_memcpy(out, buf, 48);
  89         return 0;
  90 }
  91
  92 /* ===== end - public domain SHA384 implementation ===== */