1/* $OpenBSD: hash.c,v 1.3 2013/12/09 11:03:45 markus Exp $ */
2
3/* Copied from nacl-20110221/crypto_hash/sha512/ref/hash.c */
4
5/*
620080913
7D. J. Bernstein
8Public domain.
9*/
10
11#include "includes.h"
12
13#include "crypto_api.h"
14
15#define blocks crypto_hashblocks_sha512
16
17static const unsigned char iv[64] = {
18  0x6a,0x09,0xe6,0x67,0xf3,0xbc,0xc9,0x08,
19  0xbb,0x67,0xae,0x85,0x84,0xca,0xa7,0x3b,
20  0x3c,0x6e,0xf3,0x72,0xfe,0x94,0xf8,0x2b,
21  0xa5,0x4f,0xf5,0x3a,0x5f,0x1d,0x36,0xf1,
22  0x51,0x0e,0x52,0x7f,0xad,0xe6,0x82,0xd1,
23  0x9b,0x05,0x68,0x8c,0x2b,0x3e,0x6c,0x1f,
24  0x1f,0x83,0xd9,0xab,0xfb,0x41,0xbd,0x6b,
25  0x5b,0xe0,0xcd,0x19,0x13,0x7e,0x21,0x79
26} ;
27
28typedef unsigned long long uint64;
29
30int crypto_hash_sha512(unsigned char *out,const unsigned char *in,unsigned long long inlen)
31{
32  unsigned char h[64];
33  unsigned char padded[256];
34  unsigned int i;
35  unsigned long long bytes = inlen;
36
37  for (i = 0;i < 64;++i) h[i] = iv[i];
38
39  blocks(h,in,inlen);
40  in += inlen;
41  inlen &= 127;
42  in -= inlen;
43
44  for (i = 0;i < inlen;++i) padded[i] = in[i];
45  padded[inlen] = 0x80;
46
47  if (inlen < 112) {
48    for (i = inlen + 1;i < 119;++i) padded[i] = 0;
49    padded[119] = bytes >> 61;
50    padded[120] = bytes >> 53;
51    padded[121] = bytes >> 45;
52    padded[122] = bytes >> 37;
53    padded[123] = bytes >> 29;
54    padded[124] = bytes >> 21;
55    padded[125] = bytes >> 13;
56    padded[126] = bytes >> 5;
57    padded[127] = bytes << 3;
58    blocks(h,padded,128);
59  } else {
60    for (i = inlen + 1;i < 247;++i) padded[i] = 0;
61    padded[247] = bytes >> 61;
62    padded[248] = bytes >> 53;
63    padded[249] = bytes >> 45;
64    padded[250] = bytes >> 37;
65    padded[251] = bytes >> 29;
66    padded[252] = bytes >> 21;
67    padded[253] = bytes >> 13;
68    padded[254] = bytes >> 5;
69    padded[255] = bytes << 3;
70    blocks(h,padded,256);
71  }
72
73  for (i = 0;i < 64;++i) out[i] = h[i];
74
75  return 0;
76}
77