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https://github.com/python/cpython.git
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561 lines
14 KiB
C
561 lines
14 KiB
C
/* SHA1 module */
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/* This module provides an interface to the SHA1 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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/* SHA1 objects */
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#include "Python.h"
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#include "hashlib.h"
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/* Some useful types */
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#if SIZEOF_INT == 4
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typedef unsigned int SHA1_INT32; /* 32-bit integer */
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typedef PY_LONG_LONG SHA1_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 SHA1 block size and message digest sizes, in bytes */
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#define SHA1_BLOCKSIZE 64
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#define SHA1_DIGESTSIZE 20
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/* The structure for storing SHA1 info */
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struct sha1_state {
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SHA1_INT64 length;
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SHA1_INT32 state[5], curlen;
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unsigned char buf[SHA1_BLOCKSIZE];
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};
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typedef struct {
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PyObject_HEAD
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struct sha1_state hash_state;
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} SHA1object;
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/* ------------------------------------------------------------------------
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*
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* This code for the SHA1 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 ROL(x, y) ( (((unsigned long)(x)<<(unsigned long)((y)&31)) | (((unsigned long)(x)&0xFFFFFFFFUL)>>(unsigned long)(32-((y)&31)))) & 0xFFFFFFFFUL)
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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 STORE32H(x, y) \
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{ (y)[0] = (unsigned char)(((x)>>24)&255); (y)[1] = (unsigned char)(((x)>>16)&255); \
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(y)[2] = (unsigned char)(((x)>>8)&255); (y)[3] = (unsigned char)((x)&255); }
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#define LOAD32H(x, y) \
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{ x = ((unsigned long)((y)[0] & 255)<<24) | \
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((unsigned long)((y)[1] & 255)<<16) | \
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((unsigned long)((y)[2] & 255)<<8) | \
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((unsigned long)((y)[3] & 255)); }
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#define STORE64H(x, y) \
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{ (y)[0] = (unsigned char)(((x)>>56)&255); (y)[1] = (unsigned char)(((x)>>48)&255); \
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(y)[2] = (unsigned char)(((x)>>40)&255); (y)[3] = (unsigned char)(((x)>>32)&255); \
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(y)[4] = (unsigned char)(((x)>>24)&255); (y)[5] = (unsigned char)(((x)>>16)&255); \
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(y)[6] = (unsigned char)(((x)>>8)&255); (y)[7] = (unsigned char)((x)&255); }
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#ifndef MIN
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#define MIN(x, y) ( ((x)<(y))?(x):(y) )
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#endif
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/* SHA1 macros */
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#define F0(x,y,z) (z ^ (x & (y ^ z)))
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#define F1(x,y,z) (x ^ y ^ z)
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#define F2(x,y,z) ((x & y) | (z & (x | y)))
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#define F3(x,y,z) (x ^ y ^ z)
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static void sha1_compress(struct sha1_state *sha1, unsigned char *buf)
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{
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SHA1_INT32 a,b,c,d,e,W[80],i;
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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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LOAD32H(W[i], buf + (4*i));
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}
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/* copy state */
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a = sha1->state[0];
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b = sha1->state[1];
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c = sha1->state[2];
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d = sha1->state[3];
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e = sha1->state[4];
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/* expand it */
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for (i = 16; i < 80; i++) {
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W[i] = ROL(W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16], 1);
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}
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/* compress */
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/* round one */
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#define FF_0(a,b,c,d,e,i) e = (ROLc(a, 5) + F0(b,c,d) + e + W[i] + 0x5a827999UL); b = ROLc(b, 30);
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#define FF_1(a,b,c,d,e,i) e = (ROLc(a, 5) + F1(b,c,d) + e + W[i] + 0x6ed9eba1UL); b = ROLc(b, 30);
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#define FF_2(a,b,c,d,e,i) e = (ROLc(a, 5) + F2(b,c,d) + e + W[i] + 0x8f1bbcdcUL); b = ROLc(b, 30);
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#define FF_3(a,b,c,d,e,i) e = (ROLc(a, 5) + F3(b,c,d) + e + W[i] + 0xca62c1d6UL); b = ROLc(b, 30);
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for (i = 0; i < 20; ) {
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FF_0(a,b,c,d,e,i++);
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FF_0(e,a,b,c,d,i++);
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FF_0(d,e,a,b,c,i++);
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FF_0(c,d,e,a,b,i++);
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FF_0(b,c,d,e,a,i++);
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}
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/* round two */
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for (; i < 40; ) {
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FF_1(a,b,c,d,e,i++);
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FF_1(e,a,b,c,d,i++);
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FF_1(d,e,a,b,c,i++);
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FF_1(c,d,e,a,b,i++);
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FF_1(b,c,d,e,a,i++);
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}
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/* round three */
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for (; i < 60; ) {
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FF_2(a,b,c,d,e,i++);
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FF_2(e,a,b,c,d,i++);
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FF_2(d,e,a,b,c,i++);
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FF_2(c,d,e,a,b,i++);
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FF_2(b,c,d,e,a,i++);
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}
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/* round four */
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for (; i < 80; ) {
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FF_3(a,b,c,d,e,i++);
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FF_3(e,a,b,c,d,i++);
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FF_3(d,e,a,b,c,i++);
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FF_3(c,d,e,a,b,i++);
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FF_3(b,c,d,e,a,i++);
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}
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#undef FF_0
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#undef FF_1
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#undef FF_2
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#undef FF_3
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/* store */
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sha1->state[0] = sha1->state[0] + a;
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sha1->state[1] = sha1->state[1] + b;
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sha1->state[2] = sha1->state[2] + c;
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sha1->state[3] = sha1->state[3] + d;
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sha1->state[4] = sha1->state[4] + e;
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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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void sha1_init(struct sha1_state *sha1)
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{
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assert(sha1 != NULL);
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sha1->state[0] = 0x67452301UL;
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sha1->state[1] = 0xefcdab89UL;
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sha1->state[2] = 0x98badcfeUL;
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sha1->state[3] = 0x10325476UL;
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sha1->state[4] = 0xc3d2e1f0UL;
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sha1->curlen = 0;
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sha1->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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void sha1_process(struct sha1_state *sha1,
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const unsigned char *in, unsigned long inlen)
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{
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unsigned long n;
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assert(sha1 != NULL);
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assert(in != NULL);
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assert(sha1->curlen <= sizeof(sha1->buf));
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while (inlen > 0) {
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if (sha1->curlen == 0 && inlen >= SHA1_BLOCKSIZE) {
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sha1_compress(sha1, (unsigned char *)in);
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sha1->length += SHA1_BLOCKSIZE * 8;
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in += SHA1_BLOCKSIZE;
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inlen -= SHA1_BLOCKSIZE;
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} else {
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n = MIN(inlen, (SHA1_BLOCKSIZE - sha1->curlen));
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memcpy(sha1->buf + sha1->curlen, in, (size_t)n);
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sha1->curlen += n;
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in += n;
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inlen -= n;
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if (sha1->curlen == SHA1_BLOCKSIZE) {
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sha1_compress(sha1, sha1->buf);
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sha1->length += 8*SHA1_BLOCKSIZE;
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sha1->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 (20 bytes)
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*/
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void sha1_done(struct sha1_state *sha1, unsigned char *out)
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{
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int i;
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assert(sha1 != NULL);
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assert(out != NULL);
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assert(sha1->curlen < sizeof(sha1->buf));
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/* increase the length of the message */
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sha1->length += sha1->curlen * 8;
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/* append the '1' bit */
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sha1->buf[sha1->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 (sha1->curlen > 56) {
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while (sha1->curlen < 64) {
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sha1->buf[sha1->curlen++] = (unsigned char)0;
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}
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sha1_compress(sha1, sha1->buf);
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sha1->curlen = 0;
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}
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/* pad upto 56 bytes of zeroes */
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while (sha1->curlen < 56) {
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sha1->buf[sha1->curlen++] = (unsigned char)0;
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}
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/* store length */
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STORE64H(sha1->length, sha1->buf+56);
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sha1_compress(sha1, sha1->buf);
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/* copy output */
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for (i = 0; i < 5; i++) {
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STORE32H(sha1->state[i], out+(4*i));
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}
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}
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/* .Source: /cvs/libtom/libtomcrypt/src/hashes/sha1.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 SHA1 code.
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*
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* ------------------------------------------------------------------------
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*/
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static PyTypeObject SHA1type;
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static SHA1object *
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newSHA1object(void)
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{
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return (SHA1object *)PyObject_New(SHA1object, &SHA1type);
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}
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/* Internal methods for a hash object */
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static void
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SHA1_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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PyDoc_STRVAR(SHA1_copy__doc__, "Return a copy of the hash object.");
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static PyObject *
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SHA1_copy(SHA1object *self, PyObject *unused)
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{
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SHA1object *newobj;
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if (Py_TYPE(self) == &SHA1type) {
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if ( (newobj = newSHA1object())==NULL)
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return NULL;
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} else {
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if ( (newobj = newSHA1object())==NULL)
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return NULL;
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}
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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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PyDoc_STRVAR(SHA1_digest__doc__,
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"Return the digest value as a string of binary data.");
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static PyObject *
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SHA1_digest(SHA1object *self, PyObject *unused)
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{
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unsigned char digest[SHA1_DIGESTSIZE];
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struct sha1_state temp;
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temp = self->hash_state;
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sha1_done(&temp, digest);
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return PyBytes_FromStringAndSize((const char *)digest, SHA1_DIGESTSIZE);
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}
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PyDoc_STRVAR(SHA1_hexdigest__doc__,
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"Return the digest value as a string of hexadecimal digits.");
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static PyObject *
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SHA1_hexdigest(SHA1object *self, PyObject *unused)
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{
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unsigned char digest[SHA1_DIGESTSIZE];
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struct sha1_state temp;
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PyObject *retval;
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Py_UNICODE *hex_digest;
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int i, j;
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/* Get the raw (binary) digest value */
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temp = self->hash_state;
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sha1_done(&temp, digest);
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/* Create a new string */
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retval = PyUnicode_FromStringAndSize(NULL, SHA1_DIGESTSIZE * 2);
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if (!retval)
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return NULL;
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hex_digest = PyUnicode_AS_UNICODE(retval);
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if (!hex_digest) {
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Py_DECREF(retval);
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return NULL;
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}
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/* Make hex version of the digest */
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for(i=j=0; i<SHA1_DIGESTSIZE; i++) {
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char c;
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c = (digest[i] >> 4) & 0xf;
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c = (c>9) ? c+'a'-10 : c + '0';
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hex_digest[j++] = c;
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c = (digest[i] & 0xf);
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c = (c>9) ? c+'a'-10 : c + '0';
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hex_digest[j++] = c;
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}
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return retval;
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}
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PyDoc_STRVAR(SHA1_update__doc__,
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"Update this hash object's state with the provided string.");
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static PyObject *
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SHA1_update(SHA1object *self, PyObject *args)
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{
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PyObject *obj;
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Py_buffer buf;
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if (!PyArg_ParseTuple(args, "O:update", &obj))
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return NULL;
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GET_BUFFER_VIEW_OR_ERROUT(obj, &buf);
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sha1_process(&self->hash_state, buf.buf, buf.len);
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PyBuffer_Release(&buf);
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Py_INCREF(Py_None);
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return Py_None;
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}
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static PyMethodDef SHA1_methods[] = {
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{"copy", (PyCFunction)SHA1_copy, METH_NOARGS, SHA1_copy__doc__},
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{"digest", (PyCFunction)SHA1_digest, METH_NOARGS, SHA1_digest__doc__},
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{"hexdigest", (PyCFunction)SHA1_hexdigest, METH_NOARGS, SHA1_hexdigest__doc__},
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{"update", (PyCFunction)SHA1_update, METH_VARARGS, SHA1_update__doc__},
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{NULL, NULL} /* sentinel */
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};
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static PyObject *
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SHA1_get_block_size(PyObject *self, void *closure)
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{
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return PyLong_FromLong(SHA1_BLOCKSIZE);
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}
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static PyObject *
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SHA1_get_name(PyObject *self, void *closure)
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{
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return PyUnicode_FromStringAndSize("SHA1", 3);
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}
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static PyObject *
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sha1_get_digest_size(PyObject *self, void *closure)
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{
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return PyLong_FromLong(SHA1_DIGESTSIZE);
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}
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static PyGetSetDef SHA1_getseters[] = {
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{"block_size",
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(getter)SHA1_get_block_size, NULL,
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NULL,
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NULL},
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{"name",
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(getter)SHA1_get_name, NULL,
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NULL,
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NULL},
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{"digest_size",
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(getter)sha1_get_digest_size, NULL,
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NULL,
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NULL},
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{NULL} /* Sentinel */
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};
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static PyTypeObject SHA1type = {
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PyVarObject_HEAD_INIT(NULL, 0)
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"_sha1.sha1", /*tp_name*/
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sizeof(SHA1object), /*tp_size*/
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0, /*tp_itemsize*/
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/* methods */
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SHA1_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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0, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_reserved*/
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0, /*tp_repr*/
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0, /*tp_as_number*/
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0, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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0, /*tp_hash*/
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0, /*tp_call*/
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0, /*tp_str*/
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0, /*tp_getattro*/
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0, /*tp_setattro*/
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0, /*tp_as_buffer*/
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Py_TPFLAGS_DEFAULT, /*tp_flags*/
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0, /*tp_doc*/
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0, /*tp_traverse*/
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0, /*tp_clear*/
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0, /*tp_richcompare*/
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0, /*tp_weaklistoffset*/
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0, /*tp_iter*/
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0, /*tp_iternext*/
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SHA1_methods, /* tp_methods */
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NULL, /* tp_members */
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SHA1_getseters, /* tp_getset */
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};
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/* The single module-level function: new() */
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PyDoc_STRVAR(SHA1_new__doc__,
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"Return a new SHA1 hash object; optionally initialized with a string.");
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static PyObject *
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SHA1_new(PyObject *self, PyObject *args, PyObject *kwdict)
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{
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static char *kwlist[] = {"string", NULL};
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SHA1object *new;
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PyObject *data_obj = NULL;
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Py_buffer buf;
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if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|O:new", kwlist,
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&data_obj)) {
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return NULL;
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}
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if (data_obj)
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GET_BUFFER_VIEW_OR_ERROUT(data_obj, &buf);
|
|
|
|
if ((new = newSHA1object()) == NULL) {
|
|
if (data_obj)
|
|
PyBuffer_Release(&buf);
|
|
return NULL;
|
|
}
|
|
|
|
sha1_init(&new->hash_state);
|
|
|
|
if (PyErr_Occurred()) {
|
|
Py_DECREF(new);
|
|
if (data_obj)
|
|
PyBuffer_Release(&buf);
|
|
return NULL;
|
|
}
|
|
if (data_obj) {
|
|
sha1_process(&new->hash_state, buf.buf, buf.len);
|
|
PyBuffer_Release(&buf);
|
|
}
|
|
|
|
return (PyObject *)new;
|
|
}
|
|
|
|
|
|
/* List of functions exported by this module */
|
|
|
|
static struct PyMethodDef SHA1_functions[] = {
|
|
{"sha1",(PyCFunction)SHA1_new, METH_VARARGS|METH_KEYWORDS,SHA1_new__doc__},
|
|
{NULL, NULL} /* Sentinel */
|
|
};
|
|
|
|
|
|
/* Initialize this module. */
|
|
|
|
#define insint(n,v) { PyModule_AddIntConstant(m,n,v); }
|
|
|
|
|
|
static struct PyModuleDef _sha1module = {
|
|
PyModuleDef_HEAD_INIT,
|
|
"_sha1",
|
|
NULL,
|
|
-1,
|
|
SHA1_functions,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
PyMODINIT_FUNC
|
|
PyInit__sha1(void)
|
|
{
|
|
Py_TYPE(&SHA1type) = &PyType_Type;
|
|
if (PyType_Ready(&SHA1type) < 0)
|
|
return NULL;
|
|
return PyModule_Create(&_sha1module);
|
|
}
|