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/*
* SHA-1 implementation optimized for ARM
*
* Copyright: (C) 2005 by Nicolas Pitre <nico@cam.org>
* Created: September 17, 2005
*/
#include <string.h>
#include "sha1.h"
extern void arm_sha_transform(uint32_t *hash, const unsigned char *data, uint32_t *W);
void arm_SHA1_Init(arm_SHA_CTX *c)
{
c->len = 0;
c->hash[0] = 0x67452301;
c->hash[1] = 0xefcdab89;
c->hash[2] = 0x98badcfe;
c->hash[3] = 0x10325476;
c->hash[4] = 0xc3d2e1f0;
}
void arm_SHA1_Update(arm_SHA_CTX *c, const void *p, unsigned long n)
{
uint32_t workspace[80];
unsigned int partial;
unsigned long done;
partial = c->len & 0x3f;
c->len += n;
if ((partial + n) >= 64) {
if (partial) {
done = 64 - partial;
memcpy(c->buffer + partial, p, done);
arm_sha_transform(c->hash, c->buffer, workspace);
partial = 0;
} else
done = 0;
while (n >= done + 64) {
arm_sha_transform(c->hash, p + done, workspace);
done += 64;
}
} else
done = 0;
if (n - done)
memcpy(c->buffer + partial, p + done, n - done);
}
void arm_SHA1_Final(unsigned char *hash, arm_SHA_CTX *c)
{
uint64_t bitlen;
uint32_t bitlen_hi, bitlen_lo;
unsigned int i, offset, padlen;
unsigned char bits[8];
static const unsigned char padding[64] = { 0x80, };
bitlen = c->len << 3;
offset = c->len & 0x3f;
padlen = ((offset < 56) ? 56 : (64 + 56)) - offset;
arm_SHA1_Update(c, padding, padlen);
bitlen_hi = bitlen >> 32;
bitlen_lo = bitlen & 0xffffffff;
bits[0] = bitlen_hi >> 24;
bits[1] = bitlen_hi >> 16;
bits[2] = bitlen_hi >> 8;
bits[3] = bitlen_hi;
bits[4] = bitlen_lo >> 24;
bits[5] = bitlen_lo >> 16;
bits[6] = bitlen_lo >> 8;
bits[7] = bitlen_lo;
arm_SHA1_Update(c, bits, 8);
for (i = 0; i < 5; i++) {
uint32_t v = c->hash[i];
hash[0] = v >> 24;
hash[1] = v >> 16;
hash[2] = v >> 8;
hash[3] = v;
hash += 4;
}
}
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