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586 lines
15 KiB
586 lines
15 KiB
/* MD5 module */
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/* This module provides an interface to the MD5 algorithm */
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/* See below for information about the original code this module was
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based upon. Additional work performed by:
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Andrew Kuchling (amk@amk.ca)
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Greg Stein (gstein@lyra.org)
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Trevor Perrin (trevp@trevp.net)
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Copyright (C) 2005-2007 Gregory P. Smith (greg@krypto.org)
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Licensed to PSF under a Contributor Agreement.
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*/
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/* MD5 objects */
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#include "Python.h"
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#include "hashlib.h"
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#include "pystrhex.h"
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/*[clinic input]
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module _md5
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class MD5Type "MD5object *" "&PyType_Type"
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[clinic start generated code]*/
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/*[clinic end generated code: output=da39a3ee5e6b4b0d input=6e5261719957a912]*/
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/* Some useful types */
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#if SIZEOF_INT == 4
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typedef unsigned int MD5_INT32; /* 32-bit integer */
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typedef long long MD5_INT64; /* 64-bit integer */
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#else
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/* not defined. compilation will die. */
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#endif
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/* The MD5 block size and message digest sizes, in bytes */
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#define MD5_BLOCKSIZE 64
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#define MD5_DIGESTSIZE 16
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/* The structure for storing MD5 info */
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struct md5_state {
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MD5_INT64 length;
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MD5_INT32 state[4], curlen;
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unsigned char buf[MD5_BLOCKSIZE];
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};
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typedef struct {
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PyObject_HEAD
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struct md5_state hash_state;
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} MD5object;
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#include "clinic/md5module.c.h"
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/* ------------------------------------------------------------------------
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*
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* This code for the MD5 algorithm was noted as public domain. The
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* original headers are pasted below.
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*
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* Several changes have been made to make it more compatible with the
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* Python environment and desired interface.
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*
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*/
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@gmail.com, http://libtom.org
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*/
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/* rotate the hard way (platform optimizations could be done) */
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#define ROLc(x, y) ( (((unsigned long)(x)<<(unsigned long)((y)&31)) | (((unsigned long)(x)&0xFFFFFFFFUL)>>(unsigned long)(32-((y)&31)))) & 0xFFFFFFFFUL)
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/* Endian Neutral macros that work on all platforms */
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#define STORE32L(x, y) \
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{ (y)[3] = (unsigned char)(((x)>>24)&255); (y)[2] = (unsigned char)(((x)>>16)&255); \
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(y)[1] = (unsigned char)(((x)>>8)&255); (y)[0] = (unsigned char)((x)&255); }
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#define LOAD32L(x, y) \
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{ x = ((unsigned long)((y)[3] & 255)<<24) | \
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((unsigned long)((y)[2] & 255)<<16) | \
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((unsigned long)((y)[1] & 255)<<8) | \
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((unsigned long)((y)[0] & 255)); }
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#define STORE64L(x, y) \
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{ (y)[7] = (unsigned char)(((x)>>56)&255); (y)[6] = (unsigned char)(((x)>>48)&255); \
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(y)[5] = (unsigned char)(((x)>>40)&255); (y)[4] = (unsigned char)(((x)>>32)&255); \
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(y)[3] = (unsigned char)(((x)>>24)&255); (y)[2] = (unsigned char)(((x)>>16)&255); \
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(y)[1] = (unsigned char)(((x)>>8)&255); (y)[0] = (unsigned char)((x)&255); }
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/* MD5 macros */
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#define F(x,y,z) (z ^ (x & (y ^ z)))
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#define G(x,y,z) (y ^ (z & (y ^ x)))
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#define H(x,y,z) (x^y^z)
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#define I(x,y,z) (y^(x|(~z)))
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#define FF(a,b,c,d,M,s,t) \
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a = (a + F(b,c,d) + M + t); a = ROLc(a, s) + b;
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#define GG(a,b,c,d,M,s,t) \
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a = (a + G(b,c,d) + M + t); a = ROLc(a, s) + b;
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#define HH(a,b,c,d,M,s,t) \
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a = (a + H(b,c,d) + M + t); a = ROLc(a, s) + b;
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#define II(a,b,c,d,M,s,t) \
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a = (a + I(b,c,d) + M + t); a = ROLc(a, s) + b;
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static void md5_compress(struct md5_state *md5, const unsigned char *buf)
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{
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MD5_INT32 i, W[16], a, b, c, d;
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assert(md5 != NULL);
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assert(buf != NULL);
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/* copy the state into 512-bits into W[0..15] */
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for (i = 0; i < 16; i++) {
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LOAD32L(W[i], buf + (4*i));
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}
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/* copy state */
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a = md5->state[0];
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b = md5->state[1];
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c = md5->state[2];
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d = md5->state[3];
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FF(a,b,c,d,W[0],7,0xd76aa478UL)
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FF(d,a,b,c,W[1],12,0xe8c7b756UL)
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FF(c,d,a,b,W[2],17,0x242070dbUL)
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FF(b,c,d,a,W[3],22,0xc1bdceeeUL)
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FF(a,b,c,d,W[4],7,0xf57c0fafUL)
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FF(d,a,b,c,W[5],12,0x4787c62aUL)
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FF(c,d,a,b,W[6],17,0xa8304613UL)
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FF(b,c,d,a,W[7],22,0xfd469501UL)
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FF(a,b,c,d,W[8],7,0x698098d8UL)
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FF(d,a,b,c,W[9],12,0x8b44f7afUL)
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FF(c,d,a,b,W[10],17,0xffff5bb1UL)
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FF(b,c,d,a,W[11],22,0x895cd7beUL)
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FF(a,b,c,d,W[12],7,0x6b901122UL)
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FF(d,a,b,c,W[13],12,0xfd987193UL)
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FF(c,d,a,b,W[14],17,0xa679438eUL)
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FF(b,c,d,a,W[15],22,0x49b40821UL)
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GG(a,b,c,d,W[1],5,0xf61e2562UL)
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GG(d,a,b,c,W[6],9,0xc040b340UL)
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GG(c,d,a,b,W[11],14,0x265e5a51UL)
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GG(b,c,d,a,W[0],20,0xe9b6c7aaUL)
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GG(a,b,c,d,W[5],5,0xd62f105dUL)
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GG(d,a,b,c,W[10],9,0x02441453UL)
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GG(c,d,a,b,W[15],14,0xd8a1e681UL)
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GG(b,c,d,a,W[4],20,0xe7d3fbc8UL)
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GG(a,b,c,d,W[9],5,0x21e1cde6UL)
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GG(d,a,b,c,W[14],9,0xc33707d6UL)
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GG(c,d,a,b,W[3],14,0xf4d50d87UL)
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GG(b,c,d,a,W[8],20,0x455a14edUL)
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GG(a,b,c,d,W[13],5,0xa9e3e905UL)
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GG(d,a,b,c,W[2],9,0xfcefa3f8UL)
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GG(c,d,a,b,W[7],14,0x676f02d9UL)
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GG(b,c,d,a,W[12],20,0x8d2a4c8aUL)
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HH(a,b,c,d,W[5],4,0xfffa3942UL)
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HH(d,a,b,c,W[8],11,0x8771f681UL)
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HH(c,d,a,b,W[11],16,0x6d9d6122UL)
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HH(b,c,d,a,W[14],23,0xfde5380cUL)
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HH(a,b,c,d,W[1],4,0xa4beea44UL)
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HH(d,a,b,c,W[4],11,0x4bdecfa9UL)
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HH(c,d,a,b,W[7],16,0xf6bb4b60UL)
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HH(b,c,d,a,W[10],23,0xbebfbc70UL)
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HH(a,b,c,d,W[13],4,0x289b7ec6UL)
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HH(d,a,b,c,W[0],11,0xeaa127faUL)
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HH(c,d,a,b,W[3],16,0xd4ef3085UL)
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HH(b,c,d,a,W[6],23,0x04881d05UL)
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HH(a,b,c,d,W[9],4,0xd9d4d039UL)
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HH(d,a,b,c,W[12],11,0xe6db99e5UL)
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HH(c,d,a,b,W[15],16,0x1fa27cf8UL)
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HH(b,c,d,a,W[2],23,0xc4ac5665UL)
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II(a,b,c,d,W[0],6,0xf4292244UL)
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II(d,a,b,c,W[7],10,0x432aff97UL)
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II(c,d,a,b,W[14],15,0xab9423a7UL)
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II(b,c,d,a,W[5],21,0xfc93a039UL)
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II(a,b,c,d,W[12],6,0x655b59c3UL)
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II(d,a,b,c,W[3],10,0x8f0ccc92UL)
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II(c,d,a,b,W[10],15,0xffeff47dUL)
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II(b,c,d,a,W[1],21,0x85845dd1UL)
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II(a,b,c,d,W[8],6,0x6fa87e4fUL)
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II(d,a,b,c,W[15],10,0xfe2ce6e0UL)
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II(c,d,a,b,W[6],15,0xa3014314UL)
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II(b,c,d,a,W[13],21,0x4e0811a1UL)
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II(a,b,c,d,W[4],6,0xf7537e82UL)
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II(d,a,b,c,W[11],10,0xbd3af235UL)
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II(c,d,a,b,W[2],15,0x2ad7d2bbUL)
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II(b,c,d,a,W[9],21,0xeb86d391UL)
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md5->state[0] = md5->state[0] + a;
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md5->state[1] = md5->state[1] + b;
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md5->state[2] = md5->state[2] + c;
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md5->state[3] = md5->state[3] + d;
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}
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/**
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Initialize the hash state
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@param sha1 The hash state you wish to initialize
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*/
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static void
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md5_init(struct md5_state *md5)
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{
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assert(md5 != NULL);
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md5->state[0] = 0x67452301UL;
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md5->state[1] = 0xefcdab89UL;
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md5->state[2] = 0x98badcfeUL;
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md5->state[3] = 0x10325476UL;
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md5->curlen = 0;
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md5->length = 0;
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}
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/**
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Process a block of memory though the hash
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@param sha1 The hash state
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@param in The data to hash
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@param inlen The length of the data (octets)
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*/
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static void
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md5_process(struct md5_state *md5, const unsigned char *in, Py_ssize_t inlen)
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{
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Py_ssize_t n;
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assert(md5 != NULL);
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assert(in != NULL);
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assert(md5->curlen <= sizeof(md5->buf));
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while (inlen > 0) {
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if (md5->curlen == 0 && inlen >= MD5_BLOCKSIZE) {
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md5_compress(md5, in);
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md5->length += MD5_BLOCKSIZE * 8;
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in += MD5_BLOCKSIZE;
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inlen -= MD5_BLOCKSIZE;
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} else {
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n = Py_MIN(inlen, (Py_ssize_t)(MD5_BLOCKSIZE - md5->curlen));
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memcpy(md5->buf + md5->curlen, in, (size_t)n);
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md5->curlen += (MD5_INT32)n;
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in += n;
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inlen -= n;
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if (md5->curlen == MD5_BLOCKSIZE) {
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md5_compress(md5, md5->buf);
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md5->length += 8*MD5_BLOCKSIZE;
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md5->curlen = 0;
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}
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}
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}
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}
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/**
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Terminate the hash to get the digest
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@param sha1 The hash state
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@param out [out] The destination of the hash (16 bytes)
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*/
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static void
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md5_done(struct md5_state *md5, unsigned char *out)
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{
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int i;
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assert(md5 != NULL);
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assert(out != NULL);
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assert(md5->curlen < sizeof(md5->buf));
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/* increase the length of the message */
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md5->length += md5->curlen * 8;
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/* append the '1' bit */
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md5->buf[md5->curlen++] = (unsigned char)0x80;
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/* if the length is currently above 56 bytes we append zeros
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* then compress. Then we can fall back to padding zeros and length
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* encoding like normal.
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*/
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if (md5->curlen > 56) {
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while (md5->curlen < 64) {
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md5->buf[md5->curlen++] = (unsigned char)0;
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}
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md5_compress(md5, md5->buf);
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md5->curlen = 0;
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}
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/* pad up to 56 bytes of zeroes */
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while (md5->curlen < 56) {
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md5->buf[md5->curlen++] = (unsigned char)0;
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}
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/* store length */
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STORE64L(md5->length, md5->buf+56);
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md5_compress(md5, md5->buf);
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/* copy output */
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for (i = 0; i < 4; i++) {
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STORE32L(md5->state[i], out+(4*i));
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}
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}
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/* .Source: /cvs/libtom/libtomcrypt/src/hashes/md5.c,v $ */
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/* .Revision: 1.10 $ */
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/* .Date: 2007/05/12 14:25:28 $ */
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/*
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* End of copied MD5 code.
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*
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* ------------------------------------------------------------------------
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*/
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static PyTypeObject MD5type;
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static MD5object *
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newMD5object(void)
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{
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return (MD5object *)PyObject_New(MD5object, &MD5type);
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}
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/* Internal methods for a hash object */
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static void
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MD5_dealloc(PyObject *ptr)
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{
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PyObject_Del(ptr);
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}
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/* External methods for a hash object */
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/*[clinic input]
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MD5Type.copy
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Return a copy of the hash object.
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[clinic start generated code]*/
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static PyObject *
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MD5Type_copy_impl(MD5object *self)
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/*[clinic end generated code: output=596eb36852f02071 input=2c09e6d2493f3079]*/
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{
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MD5object *newobj;
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if ((newobj = newMD5object())==NULL)
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return NULL;
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newobj->hash_state = self->hash_state;
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return (PyObject *)newobj;
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}
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/*[clinic input]
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MD5Type.digest
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Return the digest value as a bytes object.
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[clinic start generated code]*/
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static PyObject *
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MD5Type_digest_impl(MD5object *self)
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/*[clinic end generated code: output=eb691dc4190a07ec input=bc0c4397c2994be6]*/
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{
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unsigned char digest[MD5_DIGESTSIZE];
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struct md5_state temp;
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temp = self->hash_state;
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md5_done(&temp, digest);
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return PyBytes_FromStringAndSize((const char *)digest, MD5_DIGESTSIZE);
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}
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/*[clinic input]
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MD5Type.hexdigest
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Return the digest value as a string of hexadecimal digits.
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[clinic start generated code]*/
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static PyObject *
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MD5Type_hexdigest_impl(MD5object *self)
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/*[clinic end generated code: output=17badced1f3ac932 input=b60b19de644798dd]*/
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{
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unsigned char digest[MD5_DIGESTSIZE];
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struct md5_state temp;
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/* Get the raw (binary) digest value */
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temp = self->hash_state;
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md5_done(&temp, digest);
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return _Py_strhex((const char*)digest, MD5_DIGESTSIZE);
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}
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/*[clinic input]
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MD5Type.update
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obj: object
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/
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Update this hash object's state with the provided string.
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[clinic start generated code]*/
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static PyObject *
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MD5Type_update(MD5object *self, PyObject *obj)
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/*[clinic end generated code: output=f6ad168416338423 input=6e1efcd9ecf17032]*/
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{
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Py_buffer buf;
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GET_BUFFER_VIEW_OR_ERROUT(obj, &buf);
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md5_process(&self->hash_state, buf.buf, buf.len);
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PyBuffer_Release(&buf);
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Py_RETURN_NONE;
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}
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static PyMethodDef MD5_methods[] = {
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MD5TYPE_COPY_METHODDEF
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MD5TYPE_DIGEST_METHODDEF
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MD5TYPE_HEXDIGEST_METHODDEF
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MD5TYPE_UPDATE_METHODDEF
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{NULL, NULL} /* sentinel */
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};
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static PyObject *
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MD5_get_block_size(PyObject *self, void *closure)
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{
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return PyLong_FromLong(MD5_BLOCKSIZE);
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}
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static PyObject *
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MD5_get_name(PyObject *self, void *closure)
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{
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return PyUnicode_FromStringAndSize("md5", 3);
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}
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static PyObject *
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md5_get_digest_size(PyObject *self, void *closure)
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{
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return PyLong_FromLong(MD5_DIGESTSIZE);
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}
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static PyGetSetDef MD5_getseters[] = {
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{"block_size",
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(getter)MD5_get_block_size, NULL,
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NULL,
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NULL},
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{"name",
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(getter)MD5_get_name, NULL,
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NULL,
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|
NULL},
|
|
{"digest_size",
|
|
(getter)md5_get_digest_size, NULL,
|
|
NULL,
|
|
NULL},
|
|
{NULL} /* Sentinel */
|
|
};
|
|
|
|
static PyTypeObject MD5type = {
|
|
PyVarObject_HEAD_INIT(NULL, 0)
|
|
"_md5.md5", /*tp_name*/
|
|
sizeof(MD5object), /*tp_basicsize*/
|
|
0, /*tp_itemsize*/
|
|
/* methods */
|
|
MD5_dealloc, /*tp_dealloc*/
|
|
0, /*tp_vectorcall_offset*/
|
|
0, /*tp_getattr*/
|
|
0, /*tp_setattr*/
|
|
0, /*tp_as_async*/
|
|
0, /*tp_repr*/
|
|
0, /*tp_as_number*/
|
|
0, /*tp_as_sequence*/
|
|
0, /*tp_as_mapping*/
|
|
0, /*tp_hash*/
|
|
0, /*tp_call*/
|
|
0, /*tp_str*/
|
|
0, /*tp_getattro*/
|
|
0, /*tp_setattro*/
|
|
0, /*tp_as_buffer*/
|
|
Py_TPFLAGS_DEFAULT, /*tp_flags*/
|
|
0, /*tp_doc*/
|
|
0, /*tp_traverse*/
|
|
0, /*tp_clear*/
|
|
0, /*tp_richcompare*/
|
|
0, /*tp_weaklistoffset*/
|
|
0, /*tp_iter*/
|
|
0, /*tp_iternext*/
|
|
MD5_methods, /* tp_methods */
|
|
NULL, /* tp_members */
|
|
MD5_getseters, /* tp_getset */
|
|
};
|
|
|
|
|
|
/* The single module-level function: new() */
|
|
|
|
/*[clinic input]
|
|
_md5.md5
|
|
|
|
string: object(c_default="NULL") = b''
|
|
*
|
|
usedforsecurity: bool = True
|
|
|
|
Return a new MD5 hash object; optionally initialized with a string.
|
|
[clinic start generated code]*/
|
|
|
|
static PyObject *
|
|
_md5_md5_impl(PyObject *module, PyObject *string, int usedforsecurity)
|
|
/*[clinic end generated code: output=587071f76254a4ac input=7a144a1905636985]*/
|
|
{
|
|
MD5object *new;
|
|
Py_buffer buf;
|
|
|
|
if (string)
|
|
GET_BUFFER_VIEW_OR_ERROUT(string, &buf);
|
|
|
|
if ((new = newMD5object()) == NULL) {
|
|
if (string)
|
|
PyBuffer_Release(&buf);
|
|
return NULL;
|
|
}
|
|
|
|
md5_init(&new->hash_state);
|
|
|
|
if (PyErr_Occurred()) {
|
|
Py_DECREF(new);
|
|
if (string)
|
|
PyBuffer_Release(&buf);
|
|
return NULL;
|
|
}
|
|
if (string) {
|
|
md5_process(&new->hash_state, buf.buf, buf.len);
|
|
PyBuffer_Release(&buf);
|
|
}
|
|
|
|
return (PyObject *)new;
|
|
}
|
|
|
|
|
|
/* List of functions exported by this module */
|
|
|
|
static struct PyMethodDef MD5_functions[] = {
|
|
_MD5_MD5_METHODDEF
|
|
{NULL, NULL} /* Sentinel */
|
|
};
|
|
|
|
|
|
/* Initialize this module. */
|
|
|
|
static struct PyModuleDef _md5module = {
|
|
PyModuleDef_HEAD_INIT,
|
|
"_md5",
|
|
NULL,
|
|
-1,
|
|
MD5_functions,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
PyMODINIT_FUNC
|
|
PyInit__md5(void)
|
|
{
|
|
PyObject *m;
|
|
|
|
Py_SET_TYPE(&MD5type, &PyType_Type);
|
|
if (PyType_Ready(&MD5type) < 0) {
|
|
return NULL;
|
|
}
|
|
|
|
m = PyModule_Create(&_md5module);
|
|
if (m == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
Py_INCREF((PyObject *)&MD5type);
|
|
PyModule_AddObject(m, "MD5Type", (PyObject *)&MD5type);
|
|
return m;
|
|
}
|