288 lines
8.9 KiB
C
288 lines
8.9 KiB
C
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/*
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---------------------------------------------------------------------------
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Copyright (c) 2002, Dr Brian Gladman, Worcester, UK. All rights reserved.
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LICENSE TERMS
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The free distribution and use of this software in both source and binary
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form is allowed (with or without changes) provided that:
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1. distributions of this source code include the above copyright
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notice, this list of conditions and the following disclaimer;
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2. distributions in binary form include the above copyright
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notice, this list of conditions and the following disclaimer
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in the documentation and/or other associated materials;
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3. the copyright holder's name is not used to endorse products
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built using this software without specific written permission.
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ALTERNATIVELY, provided that this notice is retained in full, this product
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may be distributed under the terms of the GNU General Public License (GPL),
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in which case the provisions of the GPL apply INSTEAD OF those given above.
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DISCLAIMER
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This software is provided 'as is' with no explicit or implied warranties
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in respect of its properties, including, but not limited to, correctness
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and/or fitness for purpose.
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---------------------------------------------------------------------------
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Issue Date: 01/08/2005
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This is a bit oriented version of SHA1 that operates on arrays of bytes
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stored in memory.
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*/
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#include <string.h> /* for memcpy() etc. */
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#include "sha1.h"
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#include "brg_endian.h"
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#if defined(__cplusplus)
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extern "C"
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{
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#endif
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#if defined( _MSC_VER ) && ( _MSC_VER > 800 )
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#pragma intrinsic(memcpy)
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#endif
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#if 0 && defined(_MSC_VER)
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#define rotl32 _lrotl
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#define rotr32 _lrotr
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#else
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#define rotl32(x,n) (((x) << n) | ((x) >> (32 - n)))
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#define rotr32(x,n) (((x) >> n) | ((x) << (32 - n)))
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#endif
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#if !defined(bswap_32)
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#define bswap_32(x) (rotr32((x), 24) & 0x00ff00ff | rotr32((x), 8) & 0xff00ff00)
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#endif
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#if (PLATFORM_BYTE_ORDER == IS_LITTLE_ENDIAN)
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#define SWAP_BYTES
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#else
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#undef SWAP_BYTES
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#endif
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#if defined(SWAP_BYTES)
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#define bsw_32(p,n) \
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{ int _i = (n); while(_i--) ((uint_32t*)p)[_i] = bswap_32(((uint_32t*)p)[_i]); }
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#else
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#define bsw_32(p,n)
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#endif
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#define SHA1_MASK (SHA1_BLOCK_SIZE - 1)
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#if 0
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#define ch(x,y,z) (((x) & (y)) ^ (~(x) & (z)))
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#define parity(x,y,z) ((x) ^ (y) ^ (z))
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#define maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
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#else /* Discovered by Rich Schroeppel and Colin Plumb */
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#define ch(x,y,z) ((z) ^ ((x) & ((y) ^ (z))))
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#define parity(x,y,z) ((x) ^ (y) ^ (z))
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#define maj(x,y,z) (((x) & (y)) | ((z) & ((x) ^ (y))))
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#endif
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/* Compile 64 bytes of hash data into SHA1 context. Note */
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/* that this routine assumes that the byte order in the */
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/* ctx->wbuf[] at this point is in such an order that low */
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/* address bytes in the ORIGINAL byte stream in this buffer */
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/* will go to the high end of 32-bit words on BOTH big and */
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/* little endian systems */
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#ifdef ARRAY
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#define q(n) v[n]
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#else
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#define q(n) v##n
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#endif
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#define one_cycle(a,b,c,d,e,f,k,h) \
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q(e) += rotr32(q(a),27) + f(q(b),q(c),q(d)) + k + h;\
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q(b) = rotr32(q(b), 2)
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#define five_cycle(f,k,i) \
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one_cycle(0,1,2,3,4, f,k,hf(i )); \
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one_cycle(4,0,1,2,3, f,k,hf(i+1)); \
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one_cycle(3,4,0,1,2, f,k,hf(i+2)); \
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one_cycle(2,3,4,0,1, f,k,hf(i+3)); \
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one_cycle(1,2,3,4,0, f,k,hf(i+4))
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VOID_RETURN sha1_compile(sha1_ctx ctx[1])
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{ uint_32t *w = ctx->wbuf;
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#ifdef ARRAY
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uint_32t v[5];
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memcpy(v, ctx->hash, 5 * sizeof(uint_32t));
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#else
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uint_32t v0, v1, v2, v3, v4;
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v0 = ctx->hash[0]; v1 = ctx->hash[1];
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v2 = ctx->hash[2]; v3 = ctx->hash[3];
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v4 = ctx->hash[4];
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#endif
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#define hf(i) w[i]
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five_cycle(ch, 0x5a827999, 0);
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five_cycle(ch, 0x5a827999, 5);
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five_cycle(ch, 0x5a827999, 10);
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one_cycle(0,1,2,3,4, ch, 0x5a827999, hf(15)); \
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#undef hf
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#define hf(i) \
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(w[(i) & 15] = rotl32(w[((i) + 13) & 15] ^ w[((i) + 8) & 15] \
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^ w[((i) + 2) & 15] ^ w[(i) & 15], 1))
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one_cycle(4,0,1,2,3, ch, 0x5a827999, hf(16));
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one_cycle(3,4,0,1,2, ch, 0x5a827999, hf(17));
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one_cycle(2,3,4,0,1, ch, 0x5a827999, hf(18));
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one_cycle(1,2,3,4,0, ch, 0x5a827999, hf(19));
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five_cycle(parity, 0x6ed9eba1, 20);
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five_cycle(parity, 0x6ed9eba1, 25);
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five_cycle(parity, 0x6ed9eba1, 30);
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five_cycle(parity, 0x6ed9eba1, 35);
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five_cycle(maj, 0x8f1bbcdc, 40);
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five_cycle(maj, 0x8f1bbcdc, 45);
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five_cycle(maj, 0x8f1bbcdc, 50);
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five_cycle(maj, 0x8f1bbcdc, 55);
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five_cycle(parity, 0xca62c1d6, 60);
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five_cycle(parity, 0xca62c1d6, 65);
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five_cycle(parity, 0xca62c1d6, 70);
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five_cycle(parity, 0xca62c1d6, 75);
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#ifdef ARRAY
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ctx->hash[0] += v[0]; ctx->hash[1] += v[1];
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ctx->hash[2] += v[2]; ctx->hash[3] += v[3];
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ctx->hash[4] += v[4];
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#else
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ctx->hash[0] += v0; ctx->hash[1] += v1;
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ctx->hash[2] += v2; ctx->hash[3] += v3;
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ctx->hash[4] += v4;
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#endif
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}
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VOID_RETURN sha1_begin(sha1_ctx ctx[1])
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{
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ctx->count[0] = ctx->count[1] = 0;
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ctx->hash[0] = 0x67452301;
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ctx->hash[1] = 0xefcdab89;
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ctx->hash[2] = 0x98badcfe;
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ctx->hash[3] = 0x10325476;
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ctx->hash[4] = 0xc3d2e1f0;
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}
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/* SHA1 hash data in an array of bytes into hash buffer and */
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/* call the hash_compile function as required. */
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VOID_RETURN sha1_hash(const unsigned char data[], unsigned long len, sha1_ctx ctx[1])
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{ uint_32t pos = (uint_32t)((ctx->count[0] >> 3) & SHA1_MASK),
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ofs = (ctx->count[0] & 7);
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const unsigned char *sp = data;
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unsigned char *w = (unsigned char*)ctx->wbuf;
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if((ctx->count[0] += len) < len)
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++(ctx->count[1]);
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if(ofs) /* if not on a byte boundary */
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{
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if(ofs + len < 8) /* if no added bytes are needed */
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{
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w[pos] |= (*sp >> ofs);
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}
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else /* otherwise and add bytes */
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{ unsigned char part = w[pos];
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while((int)(ofs + (len -= 8)) >= 0)
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{
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w[pos++] = part | (*sp >> ofs);
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part = *sp++ << (8 - ofs);
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if(pos == SHA1_BLOCK_SIZE)
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{
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bsw_32(w, SHA1_BLOCK_SIZE >> 2);
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sha1_compile(ctx); pos = 0;
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}
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}
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w[pos] = part;
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}
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}
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else /* data is byte aligned */
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{ uint_32t space = SHA1_BLOCK_SIZE - pos;
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while((int)(len - 8 * space) >= 0)
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{
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len -= 8 * space;
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memcpy(w + pos, sp, space);
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sp += space;
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space = SHA1_BLOCK_SIZE;
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bsw_32(w, SHA1_BLOCK_SIZE >> 2);
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sha1_compile(ctx); pos = 0;
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}
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memcpy(w + pos, sp, (len + 7) >> 3);
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}
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}
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/* SHA1 final padding and digest calculation */
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VOID_RETURN sha1_end(unsigned char hval[], sha1_ctx ctx[1])
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{ uint_32t i = (uint_32t)((ctx->count[0] >> 3) & SHA1_MASK), m1;
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/* put bytes in the buffer in an order in which references to */
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/* 32-bit words will put bytes with lower addresses into the */
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/* top of 32 bit words on BOTH big and little endian machines */
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bsw_32(ctx->wbuf, (i + 4) >> 2);
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/* we now need to mask valid bytes and add the padding which is */
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/* a single 1 bit and as many zero bits as necessary. Note that */
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/* we can always add the first padding byte here because the */
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/* buffer always has at least one empty slot */
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m1 = (unsigned char)0x80 >> (ctx->count[0] & 7);
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ctx->wbuf[i >> 2] &= ((0xffffff00 | (~m1 + 1)) << 8 * (~i & 3));
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ctx->wbuf[i >> 2] |= (m1 << 8 * (~i & 3));
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/* we need 9 or more empty positions, one for the padding byte */
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/* (above) and eight for the length count. If there is not */
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/* enough space, pad and empty the buffer */
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if(i > SHA1_BLOCK_SIZE - 9)
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{
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if(i < 60) ctx->wbuf[15] = 0;
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sha1_compile(ctx);
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i = 0;
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}
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else /* compute a word index for the empty buffer positions */
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i = (i >> 2) + 1;
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while(i < 14) /* and zero pad all but last two positions */
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ctx->wbuf[i++] = 0;
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/* the following 32-bit length fields are assembled in the */
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/* wrong byte order on little endian machines but this is */
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/* corrected later since they are only ever used as 32-bit */
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/* word values. */
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ctx->wbuf[14] = ctx->count[1];
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ctx->wbuf[15] = ctx->count[0];
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sha1_compile(ctx);
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/* extract the hash value as bytes in case the hash buffer is */
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/* misaligned for 32-bit words */
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for(i = 0; i < SHA1_DIGEST_SIZE; ++i)
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hval[i] = (unsigned char)(ctx->hash[i >> 2] >> (8 * (~i & 3)));
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}
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VOID_RETURN sha1(unsigned char hval[], const unsigned char data[], unsigned long len)
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{ sha1_ctx cx[1];
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sha1_begin(cx); sha1_hash(data, len, cx); sha1_end(hval, cx);
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}
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#if defined(__cplusplus)
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}
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#endif
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