thodg/libgit2/src/ppc/sha1.c

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• Hash : 5e0de328
  Author :
  Date : 2012-02-13T17:10:24
  

  Update Copyright header Signed-off-by: schu <schu-github@schulog.org>

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• src/ppc/sha1.c

• /*
   * Copyright (C) 2009-2012 the libgit2 contributors
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  #include <stdio.h>
  #include <string.h>
  #include "sha1.h"
  
  extern void ppc_sha1_core(uint32_t *hash, const unsigned char *p,
  			 unsigned int nblocks);
  
  int ppc_SHA1_Init(ppc_SHA_CTX *c)
  {
  	c->hash[0] = 0x67452301;
  	c->hash[1] = 0xEFCDAB89;
  	c->hash[2] = 0x98BADCFE;
  	c->hash[3] = 0x10325476;
  	c->hash[4] = 0xC3D2E1F0;
  	c->len = 0;
  	c->cnt = 0;
  	return 0;
  }
  
  int ppc_SHA1_Update(ppc_SHA_CTX *c, const void *ptr, unsigned long n)
  {
  	unsigned long nb;
  	const unsigned char *p = ptr;
  
  	c->len += (uint64_t) n << 3;
  	while (n != 0) {
  		if (c->cnt || n < 64) {
  			nb = 64 - c->cnt;
  			if (nb > n)
  				nb = n;
  			memcpy(&c->buf.b[c->cnt], p, nb);
  			if ((c->cnt += nb) == 64) {
  				ppc_sha1_core(c->hash, c->buf.b, 1);
  				c->cnt = 0;
  			}
  		} else {
  			nb = n >> 6;
  			ppc_sha1_core(c->hash, p, nb);
  			nb <<= 6;
  		}
  		n -= nb;
  		p += nb;
  	}
  	return 0;
  }
  
  int ppc_SHA1_Final(unsigned char *hash, ppc_SHA_CTX *c)
  {
  	unsigned int cnt = c->cnt;
  
  	c->buf.b[cnt++] = 0x80;
  	if (cnt > 56) {
  		if (cnt < 64)
  			memset(&c->buf.b[cnt], 0, 64 - cnt);
  		ppc_sha1_core(c->hash, c->buf.b, 1);
  		cnt = 0;
  	}
  	if (cnt < 56)
  		memset(&c->buf.b[cnt], 0, 56 - cnt);
  	c->buf.l[7] = c->len;
  	ppc_sha1_core(c->hash, c->buf.b, 1);
  	memcpy(hash, c->hash, 20);
  	return 0;
  }
  

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