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/* $OpenBSD: hash.c,v 1.3 2013/12/09 11:03:45 markus Exp $ */
/* Copied from nacl-20110221/crypto_hash/sha512/ref/hash.c */
/*
20080913
D. J. Bernstein
Public domain.
*/
#include "includes.h"
#include "crypto_api.h"
#define blocks crypto_hashblocks_sha512
static const unsigned char iv[64] = {
0x6a,0x09,0xe6,0x67,0xf3,0xbc,0xc9,0x08,
0xbb,0x67,0xae,0x85,0x84,0xca,0xa7,0x3b,
0x3c,0x6e,0xf3,0x72,0xfe,0x94,0xf8,0x2b,
0xa5,0x4f,0xf5,0x3a,0x5f,0x1d,0x36,0xf1,
0x51,0x0e,0x52,0x7f,0xad,0xe6,0x82,0xd1,
0x9b,0x05,0x68,0x8c,0x2b,0x3e,0x6c,0x1f,
0x1f,0x83,0xd9,0xab,0xfb,0x41,0xbd,0x6b,
0x5b,0xe0,0xcd,0x19,0x13,0x7e,0x21,0x79
} ;
typedef unsigned long long uint64;
int crypto_hash_sha512(unsigned char *out,const unsigned char *in,unsigned long long inlen)
{
unsigned char h[64];
unsigned char padded[256];
unsigned int i;
unsigned long long bytes = inlen;
for (i = 0;i < 64;++i) h[i] = iv[i];
blocks(h,in,inlen);
in += inlen;
inlen &= 127;
in -= inlen;
for (i = 0;i < inlen;++i) padded[i] = in[i];
padded[inlen] = 0x80;
if (inlen < 112) {
for (i = inlen + 1;i < 119;++i) padded[i] = 0;
padded[119] = bytes >> 61;
padded[120] = bytes >> 53;
padded[121] = bytes >> 45;
padded[122] = bytes >> 37;
padded[123] = bytes >> 29;
padded[124] = bytes >> 21;
padded[125] = bytes >> 13;
padded[126] = bytes >> 5;
padded[127] = bytes << 3;
blocks(h,padded,128);
} else {
for (i = inlen + 1;i < 247;++i) padded[i] = 0;
padded[247] = bytes >> 61;
padded[248] = bytes >> 53;
padded[249] = bytes >> 45;
padded[250] = bytes >> 37;
padded[251] = bytes >> 29;
padded[252] = bytes >> 21;
padded[253] = bytes >> 13;
padded[254] = bytes >> 5;
padded[255] = bytes << 3;
blocks(h,padded,256);
}
for (i = 0;i < 64;++i) out[i] = h[i];
return 0;
}
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