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dashley |
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//$Header$
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//-------------------------------------------------------------------------------------------------
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//This file is part of "David T. Ashley's Shared Source Code", a set of shared components
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//integrated into many of David T. Ashley's projects.
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//-------------------------------------------------------------------------------------------------
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//This source code and any program in which it is compiled/used is provided under the MIT License,
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//reproduced below.
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//-------------------------------------------------------------------------------------------------
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//Permission is hereby granted, free of charge, to any person obtaining a copy of
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//this software and associated documentation files(the "Software"), to deal in the
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//Software without restriction, including without limitation the rights to use,
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//copy, modify, merge, publish, distribute, sublicense, and / or sell copies of the
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//Software, and to permit persons to whom the Software is furnished to do so,
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//subject to the following conditions :
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//
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//The above copyright notice and this permission notice shall be included in all
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//copies or substantial portions of the Software.
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//
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//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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//FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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//SOFTWARE.
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//-------------------------------------------------------------------------------------------------
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/* A description of the functionality of this module and the public interface
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dashley |
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** definition is contained in the associated .H file.
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*/
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#define MODULE_ESRG_MD5
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#include <assert.h>
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#include <stddef.h>
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#include <string.h>
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#include "charfunc.h"
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#include "esrg_md5.h"
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//These are macros which are defined for efficiency. These
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//functions come from RFC 1321.
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#define ESRG_MD5_FUNC_F(x,y,z) (((x) & (y)) | ((~x) & (z)))
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#define ESRG_MD5_FUNC_G(x,y,z) (((x) & (z)) | ( (y) & (~z)))
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#define ESRG_MD5_FUNC_H(x,y,z) ((x) ^ (y) ^ (z))
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#define ESRG_MD5_FUNC_I(x,y,z) ((y) ^ ((x) | (~z)))
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//This is a left rotation macro, again for efficiency. This
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//macro rotates a 32-bit quantity x left (cyclically) by
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//n bits.
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#define ESRG_MD5_FUNC_ROT_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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//These macros do one operation as described in the RFC. These allow
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//the inlining of code for far more speed.
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#define ESRG_MD5_FUNC_FF(a,b,c,d,x,s,ac) { \
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(a) += ESRG_MD5_FUNC_F((b),(c),(d)) + (x) + (unsigned)(ac); \
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(a) = ESRG_MD5_FUNC_ROT_LEFT((a),(s)); \
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(a) += (b); \
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}
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#define ESRG_MD5_FUNC_GG(a,b,c,d,x,s,ac) { \
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(a) += ESRG_MD5_FUNC_G((b),(c),(d)) + (x) + (unsigned)(ac); \
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(a) = ESRG_MD5_FUNC_ROT_LEFT((a),(s)); \
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(a) += (b); \
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}
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#define ESRG_MD5_FUNC_HH(a,b,c,d,x,s,ac) { \
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(a) += ESRG_MD5_FUNC_H((b),(c),(d)) + (x) + (unsigned)(ac); \
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(a) = ESRG_MD5_FUNC_ROT_LEFT((a),(s)); \
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(a) += (b); \
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}
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#define ESRG_MD5_FUNC_II(a,b,c,d,x,s,ac) { \
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(a) += ESRG_MD5_FUNC_I((b),(c),(d)) + (x) + (unsigned)(ac); \
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(a) = ESRG_MD5_FUNC_ROT_LEFT((a),(s)); \
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(a) += (b); \
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}
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//This is the padding table to append. It is done with
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//an array for quickness.
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static unsigned char ESRG_MD5_pad_table[] =
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{
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0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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void ESRG_MD5_Md5StateStructOpen(struct ESRG_MD5_Md5StateStruct *arg)
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{
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assert(arg != NULL);
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memset(arg, 0, sizeof(struct ESRG_MD5_Md5StateStruct));
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//Everything to zero, processed bitcount automatically set to zero.
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arg->A = 0x67452301; //These assignments directly from RFC.
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arg->B = 0xEFCDAB89;
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arg->C = 0x98BADCFE;
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arg->D = 0x10325476;
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}
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//Copies the byte buffer to the word buffer within the state block.
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//This is done in a way which hides big-endian/little-endian concerns.
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static void ESRG_MD5_CopyBytesToWords(struct ESRG_MD5_Md5StateStruct *arg)
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{
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int i;
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assert(arg != NULL);
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//Copy the buffer contents into the words. We need to be careful
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//to do this right, because of big-endian/little-endian concerns.
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for (i=0; i<16; i++)
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{
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assert((i * 4 + 3) < 64);
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arg->X[i] = (((unsigned int)(arg->buf[i*4+3])) << 24)
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+
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(((unsigned int)(arg->buf[i*4+2])) << 16)
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+
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(((unsigned int)(arg->buf[i*4+1])) << 8)
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+
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(((unsigned int)(arg->buf[i*4])) );
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}
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}
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//Does the MD-5 rounds as specified by RFC 1321.
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static void ESRG_MD5_DoMd5Rounds(struct ESRG_MD5_Md5StateStruct *arg)
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{
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unsigned AA, BB, CC, DD;
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//Directly from RFC 1321.
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unsigned A, B, C, D;
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//We also want to buffer out the state variables, to eliminate
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//the risk of repeated pointer dereferences.
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unsigned X[16];
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//Buffer to avoid repeated dereferences.
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assert(arg != NULL);
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//Copy bytes into words.
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ESRG_MD5_CopyBytesToWords(arg);
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//Copy out the buffer for speed.
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X[ 0] = arg->X[ 0];
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X[ 1] = arg->X[ 1];
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X[ 2] = arg->X[ 2];
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X[ 3] = arg->X[ 3];
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X[ 4] = arg->X[ 4];
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X[ 5] = arg->X[ 5];
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X[ 6] = arg->X[ 6];
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X[ 7] = arg->X[ 7];
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X[ 8] = arg->X[ 8];
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X[ 9] = arg->X[ 9];
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X[10] = arg->X[10];
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X[11] = arg->X[11];
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X[12] = arg->X[12];
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X[13] = arg->X[13];
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X[14] = arg->X[14];
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X[15] = arg->X[15];
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//Buffer out the state for speed.
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A = arg->A;
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B = arg->B;
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C = arg->C;
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D = arg->D;
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//Make the assignments to temporary variables as described by the RFC.
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AA = A;
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BB = B;
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CC = C;
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DD = D;
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//We can now do the MD-5 rounds directly as described in the RFC. The
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//most effective way to do this is with macros. I tried using a tabulated
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//approach, but the speed hit was unbelievably bad. This approach is
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//about the best known.
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//
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//Round 1
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//
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ESRG_MD5_FUNC_FF(A,B,C,D,X[ 0], 7,0xd76aa478); /* 1 */
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ESRG_MD5_FUNC_FF(D,A,B,C,X[ 1],12,0xe8c7b756); /* 2 */
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ESRG_MD5_FUNC_FF(C,D,A,B,X[ 2],17,0x242070db); /* 3 */
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ESRG_MD5_FUNC_FF(B,C,D,A,X[ 3],22,0xc1bdceee); /* 4 */
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ESRG_MD5_FUNC_FF(A,B,C,D,X[ 4], 7,0xf57c0faf); /* 5 */
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ESRG_MD5_FUNC_FF(D,A,B,C,X[ 5],12,0x4787c62a); /* 6 */
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ESRG_MD5_FUNC_FF(C,D,A,B,X[ 6],17,0xa8304613); /* 7 */
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ESRG_MD5_FUNC_FF(B,C,D,A,X[ 7],22,0xfd469501); /* 8 */
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ESRG_MD5_FUNC_FF(A,B,C,D,X[ 8], 7,0x698098d8); /* 9 */
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ESRG_MD5_FUNC_FF(D,A,B,C,X[ 9],12,0x8b44f7af); /* 10 */
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ESRG_MD5_FUNC_FF(C,D,A,B,X[10],17,0xffff5bb1); /* 11 */
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ESRG_MD5_FUNC_FF(B,C,D,A,X[11],22,0x895cd7be); /* 12 */
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ESRG_MD5_FUNC_FF(A,B,C,D,X[12], 7,0x6b901122); /* 13 */
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ESRG_MD5_FUNC_FF(D,A,B,C,X[13],12,0xfd987193); /* 14 */
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ESRG_MD5_FUNC_FF(C,D,A,B,X[14],17,0xa679438e); /* 15 */
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ESRG_MD5_FUNC_FF(B,C,D,A,X[15],22,0x49b40821); /* 16 */
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//
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//Round 2
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//
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ESRG_MD5_FUNC_GG(A,B,C,D,X[ 1], 5,0xf61e2562); /* 17 */
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ESRG_MD5_FUNC_GG(D,A,B,C,X[ 6], 9,0xc040b340); /* 18 */
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ESRG_MD5_FUNC_GG(C,D,A,B,X[11],14,0x265e5a51); /* 19 */
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ESRG_MD5_FUNC_GG(B,C,D,A,X[ 0],20,0xe9b6c7aa); /* 20 */
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ESRG_MD5_FUNC_GG(A,B,C,D,X[ 5], 5,0xd62f105d); /* 21 */
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ESRG_MD5_FUNC_GG(D,A,B,C,X[10], 9,0x02441453); /* 22 */
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ESRG_MD5_FUNC_GG(C,D,A,B,X[15],14,0xd8a1e681); /* 23 */
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ESRG_MD5_FUNC_GG(B,C,D,A,X[ 4],20,0xe7d3fbc8); /* 24 */
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ESRG_MD5_FUNC_GG(A,B,C,D,X[ 9], 5,0x21e1cde6); /* 25 */
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ESRG_MD5_FUNC_GG(D,A,B,C,X[14], 9,0xc33707d6); /* 26 */
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ESRG_MD5_FUNC_GG(C,D,A,B,X[ 3],14,0xf4d50d87); /* 27 */
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ESRG_MD5_FUNC_GG(B,C,D,A,X[ 8],20,0x455a14ed); /* 28 */
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ESRG_MD5_FUNC_GG(A,B,C,D,X[13], 5,0xa9e3e905); /* 29 */
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ESRG_MD5_FUNC_GG(D,A,B,C,X[ 2], 9,0xfcefa3f8); /* 30 */
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ESRG_MD5_FUNC_GG(C,D,A,B,X[ 7],14,0x676f02d9); /* 31 */
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ESRG_MD5_FUNC_GG(B,C,D,A,X[12],20,0x8d2a4c8a); /* 32 */
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//
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//Round 3
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//
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ESRG_MD5_FUNC_HH(A,B,C,D,X[ 5], 4,0xfffa3942); /* 33 */
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ESRG_MD5_FUNC_HH(D,A,B,C,X[ 8],11,0x8771f681); /* 34 */
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ESRG_MD5_FUNC_HH(C,D,A,B,X[11],16,0x6d9d6122); /* 35 */
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ESRG_MD5_FUNC_HH(B,C,D,A,X[14],23,0xfde5380c); /* 36 */
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ESRG_MD5_FUNC_HH(A,B,C,D,X[ 1], 4,0xa4beea44); /* 37 */
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ESRG_MD5_FUNC_HH(D,A,B,C,X[ 4],11,0x4bdecfa9); /* 38 */
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ESRG_MD5_FUNC_HH(C,D,A,B,X[ 7],16,0xf6bb4b60); /* 39 */
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ESRG_MD5_FUNC_HH(B,C,D,A,X[10],23,0xbebfbc70); /* 40 */
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ESRG_MD5_FUNC_HH(A,B,C,D,X[13], 4,0x289b7ec6); /* 41 */
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ESRG_MD5_FUNC_HH(D,A,B,C,X[ 0],11,0xeaa127fa); /* 42 */
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ESRG_MD5_FUNC_HH(C,D,A,B,X[ 3],16,0xd4ef3085); /* 43 */
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ESRG_MD5_FUNC_HH(B,C,D,A,X[ 6],23,0x04881d05); /* 44 */
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ESRG_MD5_FUNC_HH(A,B,C,D,X[ 9], 4,0xd9d4d039); /* 45 */
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ESRG_MD5_FUNC_HH(D,A,B,C,X[12],11,0xe6db99e5); /* 46 */
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ESRG_MD5_FUNC_HH(C,D,A,B,X[15],16,0x1fa27cf8); /* 47 */
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ESRG_MD5_FUNC_HH(B,C,D,A,X[ 2],23,0xc4ac5665); /* 48 */
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//
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//Round 4
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//
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ESRG_MD5_FUNC_II(A,B,C,D,X[ 0], 6,0xf4292244); /* 49 */
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ESRG_MD5_FUNC_II(D,A,B,C,X[ 7],10,0x432aff97); /* 50 */
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ESRG_MD5_FUNC_II(C,D,A,B,X[14],15,0xab9423a7); /* 51 */
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ESRG_MD5_FUNC_II(B,C,D,A,X[ 5],21,0xfc93a039); /* 52 */
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ESRG_MD5_FUNC_II(A,B,C,D,X[12], 6,0x655b59c3); /* 53 */
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ESRG_MD5_FUNC_II(D,A,B,C,X[ 3],10,0x8f0ccc92); /* 54 */
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ESRG_MD5_FUNC_II(C,D,A,B,X[10],15,0xffeff47d); /* 55 */
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ESRG_MD5_FUNC_II(B,C,D,A,X[ 1],21,0x85845dd1); /* 56 */
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ESRG_MD5_FUNC_II(A,B,C,D,X[ 8], 6,0x6fa87e4f); /* 57 */
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ESRG_MD5_FUNC_II(D,A,B,C,X[15],10,0xfe2ce6e0); /* 58 */
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ESRG_MD5_FUNC_II(C,D,A,B,X[ 6],15,0xa3014314); /* 59 */
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ESRG_MD5_FUNC_II(B,C,D,A,X[13],21,0x4e0811a1); /* 60 */
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ESRG_MD5_FUNC_II(A,B,C,D,X[ 4], 6,0xf7537e82); /* 61 */
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ESRG_MD5_FUNC_II(D,A,B,C,X[11],10,0xbd3af235); /* 62 */
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ESRG_MD5_FUNC_II(C,D,A,B,X[ 2],15,0x2ad7d2bb); /* 63 */
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ESRG_MD5_FUNC_II(B,C,D,A,X[ 9],21,0xeb86d391); /* 64 */
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//End of Round 4.
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//Perform the four additions as mandated by the RFC.
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A += AA;
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B += BB;
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C += CC;
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D += DD;
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264 |
|
|
|
265 |
|
|
//Buffer the state vector back.
|
266 |
|
|
arg->A = A;
|
267 |
|
|
arg->B = B;
|
268 |
|
|
arg->C = C;
|
269 |
|
|
arg->D = D;
|
270 |
|
|
}
|
271 |
|
|
|
272 |
|
|
|
273 |
|
|
void ESRG_MD5_Md5StateStructAddData(struct ESRG_MD5_Md5StateStruct *arg,
|
274 |
|
|
void *pointer_in,
|
275 |
|
|
unsigned len)
|
276 |
|
|
{
|
277 |
|
|
unsigned int low_32;
|
278 |
|
|
unsigned int byte_offset;
|
279 |
|
|
unsigned char *data;
|
280 |
|
|
|
281 |
|
|
assert(arg != NULL);
|
282 |
|
|
assert(pointer_in != NULL);
|
283 |
|
|
|
284 |
|
|
data = (unsigned char *)pointer_in;
|
285 |
|
|
//It is easier to do it this way, rather than cast all the time.
|
286 |
|
|
|
287 |
|
|
low_32 = (unsigned int)arg->bit_count;
|
288 |
|
|
//Copy off the least significant bits. Easier to do once.
|
289 |
|
|
|
290 |
|
|
byte_offset = low_32 >> 3;
|
291 |
|
|
//This gives our byte offset, up to 500+Mb or so.
|
292 |
|
|
|
293 |
|
|
while(len--)
|
294 |
|
|
{
|
295 |
|
|
//We process rounds AFTER a byte is added to the buffer. So
|
296 |
|
|
//it is always safe to add a byte first.
|
297 |
|
|
arg->buf[byte_offset & 0x3F] = *data;
|
298 |
|
|
|
299 |
|
|
//Nothing to do unless this was the final byte of the buffer.
|
300 |
|
|
if ((byte_offset & 0x3F) == 63)
|
301 |
|
|
{
|
302 |
|
|
ESRG_MD5_DoMd5Rounds(arg);
|
303 |
|
|
}
|
304 |
|
|
|
305 |
|
|
//Increment.
|
306 |
|
|
data++;
|
307 |
|
|
byte_offset++;
|
308 |
|
|
arg->bit_count += 8;
|
309 |
|
|
}
|
310 |
|
|
}
|
311 |
|
|
|
312 |
|
|
|
313 |
|
|
void ESRG_MD5_Md5StateStructClose(struct ESRG_MD5_Md5StateStruct *state,
|
314 |
|
|
struct ESRG_MD5_Md5ResultStruct *result)
|
315 |
|
|
{
|
316 |
|
|
unsigned int low_32, high_32, high_32_copy, low_32_copy;
|
317 |
|
|
unsigned int byte_offset;
|
318 |
|
|
unsigned int buffer_offset;
|
319 |
|
|
unsigned char length_buf[8];
|
320 |
|
|
//int i;
|
321 |
|
|
|
322 |
|
|
assert(state != NULL);
|
323 |
|
|
assert(result != NULL);
|
324 |
|
|
|
325 |
|
|
//Obtain easier-to-use indices. These provide a snapshot of the
|
326 |
|
|
//length before padding is done.
|
327 |
|
|
low_32 = (unsigned int)state->bit_count;
|
328 |
|
|
high_32 = (unsigned int)(state->bit_count >> 32);
|
329 |
|
|
byte_offset = low_32 >> 3;
|
330 |
|
|
buffer_offset = byte_offset & 0x3F;
|
331 |
|
|
|
332 |
|
|
//We need to pad the buffer out to 8 bytes short of a multiple,
|
333 |
|
|
//per RFC 1321.
|
334 |
|
|
ESRG_MD5_Md5StateStructAddData(state,
|
335 |
|
|
ESRG_MD5_pad_table,
|
336 |
|
|
(buffer_offset==56) ? (64) : ((56 - buffer_offset) & 0x3F));
|
337 |
|
|
|
338 |
|
|
//At this point we are fully prepped to stuff in the length in bits.
|
339 |
|
|
//Prepare the length in a buffer.
|
340 |
|
|
high_32_copy = high_32;
|
341 |
|
|
low_32_copy = low_32;
|
342 |
|
|
length_buf[0] = (unsigned char)(low_32_copy);
|
343 |
|
|
length_buf[1] = (unsigned char)(low_32_copy >> 8);
|
344 |
|
|
length_buf[2] = (unsigned char)(low_32_copy >> 16);
|
345 |
|
|
length_buf[3] = (unsigned char)(low_32_copy >> 24);
|
346 |
|
|
length_buf[4] = (unsigned char)(high_32_copy);
|
347 |
|
|
length_buf[5] = (unsigned char)(high_32_copy >> 8);
|
348 |
|
|
length_buf[6] = (unsigned char)(high_32_copy >> 16);
|
349 |
|
|
length_buf[7] = (unsigned char)(high_32_copy >> 24);
|
350 |
|
|
|
351 |
|
|
//Tack on the length. This is guaranteed to generate end up with
|
352 |
|
|
//the last thing being done the compute plus the index being zero.
|
353 |
|
|
//
|
354 |
|
|
ESRG_MD5_Md5StateStructAddData(state,
|
355 |
|
|
length_buf,
|
356 |
|
|
8);
|
357 |
|
|
|
358 |
|
|
//Be absolutely sure we are rolled over to zero.
|
359 |
|
|
assert((((int)state->bit_count) & 0x1FF) == 0);
|
360 |
|
|
|
361 |
|
|
//Zero out the return state, just to be sure.
|
362 |
|
|
memset(result, 0, sizeof(struct ESRG_MD5_Md5ResultStruct));
|
363 |
|
|
|
364 |
|
|
//Give caller the binary version.
|
365 |
|
|
result->md5_words[0] = state->A;
|
366 |
|
|
result->md5_words[1] = state->B;
|
367 |
|
|
result->md5_words[2] = state->C;
|
368 |
|
|
result->md5_words[3] = state->D;
|
369 |
|
|
|
370 |
|
|
//Convert to string for caller.
|
371 |
|
|
CHARFUNC_int_to_lc_hex_rev(state->A, result->md5_chars + 0);
|
372 |
|
|
CHARFUNC_int_to_lc_hex_rev(state->B, result->md5_chars + 8);
|
373 |
|
|
CHARFUNC_int_to_lc_hex_rev(state->C, result->md5_chars + 16);
|
374 |
|
|
CHARFUNC_int_to_lc_hex_rev(state->D, result->md5_chars + 24);
|
375 |
|
|
|
376 |
|
|
//Because of the way the CHARFUNC_int_to_lc_hex_rev() function
|
377 |
|
|
//works, it produces the mirror image of the sequence of nibbles.
|
378 |
|
|
//This is not quite what we want. What we want (least significant
|
379 |
|
|
//byte first, but within each byte most significant nibble first)
|
380 |
|
|
//from each integer is this:
|
381 |
|
|
//
|
382 |
|
|
// n1 n0 n3 n2 n5 n4 n7 n6
|
383 |
|
|
//
|
384 |
|
|
//but what we get from that function is this:
|
385 |
|
|
//
|
386 |
|
|
// n0 n1 n2 n3 n4 n5 n6 n6,
|
387 |
|
|
//
|
388 |
|
|
//so we have to swap nibbles in each byte.
|
389 |
|
|
//
|
390 |
|
|
{
|
391 |
|
|
int i;
|
392 |
|
|
char temp;
|
393 |
|
|
|
394 |
|
|
for (i=0; i<16; i++)
|
395 |
|
|
{
|
396 |
|
|
temp = result->md5_chars[i*2];
|
397 |
|
|
result->md5_chars[i*2] = result->md5_chars[i*2+1];
|
398 |
|
|
result->md5_chars[i*2+1] = temp;
|
399 |
|
|
}
|
400 |
|
|
}
|
401 |
|
|
|
402 |
|
|
result->md5_chars[32] = 0; //Terminator.
|
403 |
|
|
|
404 |
|
|
//Destroy the state, which may contain sensitive information.
|
405 |
|
|
//This idea came from Rivest's sample code.
|
406 |
|
|
memset(state, 0, sizeof(struct ESRG_MD5_Md5StateStruct));
|
407 |
|
|
}
|
408 |
|
|
|
409 |
|
|
|
410 |
|
|
//Returns version control string for file.
|
411 |
|
|
//
|
412 |
|
|
const char *ESRG_MD5_cvcinfo(void)
|
413 |
|
|
{
|
414 |
dashley |
56 |
return ("$Header$");
|
415 |
dashley |
25 |
}
|
416 |
|
|
|
417 |
|
|
|
418 |
|
|
//Returns version control string for associated .H file.
|
419 |
|
|
//
|
420 |
|
|
const char *ESRG_MD5_hvcinfo(void)
|
421 |
|
|
{
|
422 |
|
|
return (ESRG_MD5_H_VERSION);
|
423 |
|
|
}
|
424 |
|
|
|
425 |
dashley |
56 |
//End of esrg_md5.c.
|