crypto/openssh/hash.c

   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 /*
   6 20080913
   7 D. J. Bernstein
   8 Public domain.
   9 */
  10
  11 #include "includes.h"
  12
  13 #include "crypto_api.h"
  14
  15 #define blocks crypto_hashblocks_sha512
  16
  17 static 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
  28 typedef unsigned long long uint64;
  29
  30 int 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 }