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- /*
- * md4.c : MD4 hash algorithm.
- *
- * Part of the Python Cryptography Toolkit
- *
- * Originally written by: A.M. Kuchling
- *
- * ===================================================================
- * The contents of this file are dedicated to the public domain. To
- * the extent that dedication to the public domain is not available,
- * everyone is granted a worldwide, perpetual, royalty-free,
- * non-exclusive license to exercise all rights associated with the
- * contents of this file for any purpose whatsoever.
- * No rights are reserved.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- * ===================================================================
- *
- */
-
- #include <string.h>
- #include "Python.h"
- #include "pycrypto_compat.h"
- #define MODULE_NAME _MD4
- #define DIGEST_SIZE 16
- #define BLOCK_SIZE 64
- typedef unsigned int U32;
- typedef unsigned char U8;
- #define U32_MAX (U32)4294967295
- typedef struct {
- U32 A,B,C,D, count;
- U32 len1, len2;
- U8 buf[64];
- } hash_state;
- #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
- #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
- #define H(x, y, z) ((x) ^ (y) ^ (z))
- /* ROTATE_LEFT rotates x left n bits */
- #define ROL(x, n) (((x) << n) | ((x) >> (32-n) ))
- static void
- hash_init (hash_state *ptr)
- {
- ptr->A=(U32)0x67452301;
- ptr->B=(U32)0xefcdab89;
- ptr->C=(U32)0x98badcfe;
- ptr->D=(U32)0x10325476;
- ptr->count=ptr->len1=ptr->len2=0;
- }
- static void
- hash_copy(hash_state *src, hash_state *dest)
- {
- dest->len1=src->len1;
- dest->len2=src->len2;
- dest->A=src->A;
- dest->B=src->B;
- dest->C=src->C;
- dest->D=src->D;
- dest->count=src->count;
- memcpy(dest->buf, src->buf, dest->count);
- }
- static void
- hash_update (hash_state *self, const U8 *buf, U32 len)
- {
- U32 L;
- if ((self->len1+(len<<3))<self->len1)
- {
- self->len2++;
- }
- self->len1+=len<< 3;
- self->len2+=len>>29;
- while (len>0)
- {
- L=(64-self->count) < len ? (64-self->count) : len;
- memcpy(self->buf+self->count, buf, L);
- self->count+=L;
- buf+=L;
- len-=L;
- if (self->count==64)
- {
- U32 X[16], A, B, C, D;
- int i,j;
- self->count=0;
- for(i=j=0; j<16; i+=4, j++)
- X[j]=((U32)self->buf[i] + ((U32)self->buf[i+1]<<8) +
- ((U32)self->buf[i+2]<<16) + ((U32)self->buf[i+3]<<24));
- A=self->A; B=self->B; C=self->C; D=self->D;
- #define function(a,b,c,d,k,s) a=ROL(a+F(b,c,d)+X[k],s);
- function(A,B,C,D, 0, 3);
- function(D,A,B,C, 1, 7);
- function(C,D,A,B, 2,11);
- function(B,C,D,A, 3,19);
- function(A,B,C,D, 4, 3);
- function(D,A,B,C, 5, 7);
- function(C,D,A,B, 6,11);
- function(B,C,D,A, 7,19);
- function(A,B,C,D, 8, 3);
- function(D,A,B,C, 9, 7);
- function(C,D,A,B,10,11);
- function(B,C,D,A,11,19);
- function(A,B,C,D,12, 3);
- function(D,A,B,C,13, 7);
- function(C,D,A,B,14,11);
- function(B,C,D,A,15,19);
- #undef function
- #define function(a,b,c,d,k,s) a=ROL(a+G(b,c,d)+X[k]+(U32)0x5a827999,s);
- function(A,B,C,D, 0, 3);
- function(D,A,B,C, 4, 5);
- function(C,D,A,B, 8, 9);
- function(B,C,D,A,12,13);
- function(A,B,C,D, 1, 3);
- function(D,A,B,C, 5, 5);
- function(C,D,A,B, 9, 9);
- function(B,C,D,A,13,13);
- function(A,B,C,D, 2, 3);
- function(D,A,B,C, 6, 5);
- function(C,D,A,B,10, 9);
- function(B,C,D,A,14,13);
- function(A,B,C,D, 3, 3);
- function(D,A,B,C, 7, 5);
- function(C,D,A,B,11, 9);
- function(B,C,D,A,15,13);
- #undef function
- #define function(a,b,c,d,k,s) a=ROL(a+H(b,c,d)+X[k]+(U32)0x6ed9eba1,s);
- function(A,B,C,D, 0, 3);
- function(D,A,B,C, 8, 9);
- function(C,D,A,B, 4,11);
- function(B,C,D,A,12,15);
- function(A,B,C,D, 2, 3);
- function(D,A,B,C,10, 9);
- function(C,D,A,B, 6,11);
- function(B,C,D,A,14,15);
- function(A,B,C,D, 1, 3);
- function(D,A,B,C, 9, 9);
- function(C,D,A,B, 5,11);
- function(B,C,D,A,13,15);
- function(A,B,C,D, 3, 3);
- function(D,A,B,C,11, 9);
- function(C,D,A,B, 7,11);
- function(B,C,D,A,15,15);
- self->A+=A; self->B+=B; self->C+=C; self->D+=D;
- }
- }
- }
- static PyObject *
- hash_digest (const hash_state *self)
- {
- U8 digest[16];
- static U8 s[8];
- U32 padlen, oldlen1, oldlen2;
- hash_state temp;
- static U8 padding[64] = {
- 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
- };
- memcpy(&temp, self, sizeof(hash_state));
- oldlen1=temp.len1; oldlen2=temp.len2; /* Save current length */
- padlen= (56<=self->count) ? 56-self->count+64: 56-self->count;
- hash_update(&temp, padding, padlen);
- s[0]= oldlen1 & 255;
- s[1]=(oldlen1 >> 8) & 255;
- s[2]=(oldlen1 >> 16) & 255;
- s[3]=(oldlen1 >> 24) & 255;
- s[4]= oldlen2 & 255;
- s[5]=(oldlen2 >> 8) & 255;
- s[6]=(oldlen2 >> 16) & 255;
- s[7]=(oldlen2 >> 24) & 255;
- hash_update(&temp, s, 8);
-
- digest[ 0]= temp.A & 255;
- digest[ 1]=(temp.A >> 8) & 255;
- digest[ 2]=(temp.A >> 16) & 255;
- digest[ 3]=(temp.A >> 24) & 255;
- digest[ 4]= temp.B & 255;
- digest[ 5]=(temp.B >> 8) & 255;
- digest[ 6]=(temp.B >> 16) & 255;
- digest[ 7]=(temp.B >> 24) & 255;
- digest[ 8]= temp.C & 255;
- digest[ 9]=(temp.C >> 8) & 255;
- digest[10]=(temp.C >> 16) & 255;
- digest[11]=(temp.C >> 24) & 255;
- digest[12]= temp.D & 255;
- digest[13]=(temp.D >> 8) & 255;
- digest[14]=(temp.D >> 16) & 255;
- digest[15]=(temp.D >> 24) & 255;
-
- return PyBytes_FromStringAndSize((char *) digest, 16);
- }
- #include "hash_template.c"
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