source: python/trunk/Modules/sha256module.c

Last change on this file was 391, checked in by dmik, 11 years ago

python: Merge vendor 2.7.6 to trunk.
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[2]1/* SHA256 module */
2
3/* This module provides an interface to NIST's SHA-256 and SHA-224 Algorithms */
4
5/* See below for information about the original code this module was
6 based upon. Additional work performed by:
7
8 Andrew Kuchling (amk@amk.ca)
9 Greg Stein (gstein@lyra.org)
10 Trevor Perrin (trevp@trevp.net)
11
12 Copyright (C) 2005 Gregory P. Smith (greg@krypto.org)
13 Licensed to PSF under a Contributor Agreement.
14
15*/
16
17/* SHA objects */
18
19#include "Python.h"
20#include "structmember.h"
21
22
23/* Endianness testing and definitions */
24#define TestEndianness(variable) {int i=1; variable=PCT_BIG_ENDIAN;\
[391]25 if (*((char*)&i)==1) variable=PCT_LITTLE_ENDIAN;}
[2]26
27#define PCT_LITTLE_ENDIAN 1
28#define PCT_BIG_ENDIAN 0
29
30/* Some useful types */
31
32typedef unsigned char SHA_BYTE;
33
34#if SIZEOF_INT == 4
[391]35typedef unsigned int SHA_INT32; /* 32-bit integer */
[2]36#else
37/* not defined. compilation will die. */
38#endif
39
40/* The SHA block size and message digest sizes, in bytes */
41
42#define SHA_BLOCKSIZE 64
43#define SHA_DIGESTSIZE 32
44
45/* The structure for storing SHA info */
46
47typedef struct {
48 PyObject_HEAD
[391]49 SHA_INT32 digest[8]; /* Message digest */
50 SHA_INT32 count_lo, count_hi; /* 64-bit bit count */
51 SHA_BYTE data[SHA_BLOCKSIZE]; /* SHA data buffer */
[2]52 int Endianness;
[391]53 int local; /* unprocessed amount in data */
[2]54 int digestsize;
55} SHAobject;
56
57/* When run on a little-endian CPU we need to perform byte reversal on an
58 array of longwords. */
59
60static void longReverse(SHA_INT32 *buffer, int byteCount, int Endianness)
61{
62 SHA_INT32 value;
63
64 if ( Endianness == PCT_BIG_ENDIAN )
[391]65 return;
[2]66
67 byteCount /= sizeof(*buffer);
68 while (byteCount--) {
69 value = *buffer;
70 value = ( ( value & 0xFF00FF00L ) >> 8 ) | \
71 ( ( value & 0x00FF00FFL ) << 8 );
72 *buffer++ = ( value << 16 ) | ( value >> 16 );
73 }
74}
75
76static void SHAcopy(SHAobject *src, SHAobject *dest)
77{
78 dest->Endianness = src->Endianness;
79 dest->local = src->local;
80 dest->digestsize = src->digestsize;
81 dest->count_lo = src->count_lo;
82 dest->count_hi = src->count_hi;
83 memcpy(dest->digest, src->digest, sizeof(src->digest));
84 memcpy(dest->data, src->data, sizeof(src->data));
85}
86
87
88/* ------------------------------------------------------------------------
89 *
90 * This code for the SHA-256 algorithm was noted as public domain. The
91 * original headers are pasted below.
92 *
93 * Several changes have been made to make it more compatible with the
94 * Python environment and desired interface.
95 *
96 */
97
98/* LibTomCrypt, modular cryptographic library -- Tom St Denis
99 *
100 * LibTomCrypt is a library that provides various cryptographic
101 * algorithms in a highly modular and flexible manner.
102 *
103 * The library is free for all purposes without any express
104 * gurantee it works.
105 *
106 * Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
107 */
108
109
110/* SHA256 by Tom St Denis */
111
112/* Various logical functions */
113#define ROR(x, y)\
114( ((((unsigned long)(x)&0xFFFFFFFFUL)>>(unsigned long)((y)&31)) | \
115((unsigned long)(x)<<(unsigned long)(32-((y)&31)))) & 0xFFFFFFFFUL)
116#define Ch(x,y,z) (z ^ (x & (y ^ z)))
[391]117#define Maj(x,y,z) (((x | y) & z) | (x & y))
[2]118#define S(x, n) ROR((x),(n))
119#define R(x, n) (((x)&0xFFFFFFFFUL)>>(n))
120#define Sigma0(x) (S(x, 2) ^ S(x, 13) ^ S(x, 22))
121#define Sigma1(x) (S(x, 6) ^ S(x, 11) ^ S(x, 25))
122#define Gamma0(x) (S(x, 7) ^ S(x, 18) ^ R(x, 3))
123#define Gamma1(x) (S(x, 17) ^ S(x, 19) ^ R(x, 10))
124
125
126static void
127sha_transform(SHAobject *sha_info)
128{
129 int i;
[391]130 SHA_INT32 S[8], W[64], t0, t1;
[2]131
132 memcpy(W, sha_info->data, sizeof(sha_info->data));
133 longReverse(W, (int)sizeof(sha_info->data), sha_info->Endianness);
134
135 for (i = 16; i < 64; ++i) {
[391]136 W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16];
[2]137 }
138 for (i = 0; i < 8; ++i) {
139 S[i] = sha_info->digest[i];
140 }
141
142 /* Compress */
143#define RND(a,b,c,d,e,f,g,h,i,ki) \
144 t0 = h + Sigma1(e) + Ch(e, f, g) + ki + W[i]; \
145 t1 = Sigma0(a) + Maj(a, b, c); \
146 d += t0; \
147 h = t0 + t1;
148
149 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],0,0x428a2f98);
150 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],1,0x71374491);
151 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],2,0xb5c0fbcf);
152 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],3,0xe9b5dba5);
153 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],4,0x3956c25b);
154 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],5,0x59f111f1);
155 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],6,0x923f82a4);
156 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],7,0xab1c5ed5);
157 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],8,0xd807aa98);
158 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],9,0x12835b01);
159 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],10,0x243185be);
160 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],11,0x550c7dc3);
161 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],12,0x72be5d74);
162 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],13,0x80deb1fe);
163 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],14,0x9bdc06a7);
164 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],15,0xc19bf174);
165 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],16,0xe49b69c1);
166 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],17,0xefbe4786);
167 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],18,0x0fc19dc6);
168 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],19,0x240ca1cc);
169 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],20,0x2de92c6f);
170 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],21,0x4a7484aa);
171 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],22,0x5cb0a9dc);
172 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],23,0x76f988da);
173 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],24,0x983e5152);
174 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],25,0xa831c66d);
175 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],26,0xb00327c8);
176 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],27,0xbf597fc7);
177 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],28,0xc6e00bf3);
178 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],29,0xd5a79147);
179 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],30,0x06ca6351);
180 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],31,0x14292967);
181 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],32,0x27b70a85);
182 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],33,0x2e1b2138);
183 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],34,0x4d2c6dfc);
184 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],35,0x53380d13);
185 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],36,0x650a7354);
186 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],37,0x766a0abb);
187 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],38,0x81c2c92e);
188 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],39,0x92722c85);
189 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],40,0xa2bfe8a1);
190 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],41,0xa81a664b);
191 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],42,0xc24b8b70);
192 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],43,0xc76c51a3);
193 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],44,0xd192e819);
194 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],45,0xd6990624);
195 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],46,0xf40e3585);
196 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],47,0x106aa070);
197 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],48,0x19a4c116);
198 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],49,0x1e376c08);
199 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],50,0x2748774c);
200 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],51,0x34b0bcb5);
201 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],52,0x391c0cb3);
202 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],53,0x4ed8aa4a);
203 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],54,0x5b9cca4f);
204 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],55,0x682e6ff3);
205 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],56,0x748f82ee);
206 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],57,0x78a5636f);
207 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],58,0x84c87814);
208 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],59,0x8cc70208);
209 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],60,0x90befffa);
210 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],61,0xa4506ceb);
211 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],62,0xbef9a3f7);
212 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],63,0xc67178f2);
213
[391]214#undef RND
215
[2]216 /* feedback */
217 for (i = 0; i < 8; i++) {
218 sha_info->digest[i] = sha_info->digest[i] + S[i];
219 }
220
221}
222
223
224
225/* initialize the SHA digest */
226
227static void
228sha_init(SHAobject *sha_info)
229{
230 TestEndianness(sha_info->Endianness)
231 sha_info->digest[0] = 0x6A09E667L;
232 sha_info->digest[1] = 0xBB67AE85L;
233 sha_info->digest[2] = 0x3C6EF372L;
234 sha_info->digest[3] = 0xA54FF53AL;
235 sha_info->digest[4] = 0x510E527FL;
236 sha_info->digest[5] = 0x9B05688CL;
237 sha_info->digest[6] = 0x1F83D9ABL;
238 sha_info->digest[7] = 0x5BE0CD19L;
239 sha_info->count_lo = 0L;
240 sha_info->count_hi = 0L;
241 sha_info->local = 0;
242 sha_info->digestsize = 32;
243}
244
245static void
246sha224_init(SHAobject *sha_info)
247{
248 TestEndianness(sha_info->Endianness)
249 sha_info->digest[0] = 0xc1059ed8L;
250 sha_info->digest[1] = 0x367cd507L;
251 sha_info->digest[2] = 0x3070dd17L;
252 sha_info->digest[3] = 0xf70e5939L;
253 sha_info->digest[4] = 0xffc00b31L;
254 sha_info->digest[5] = 0x68581511L;
255 sha_info->digest[6] = 0x64f98fa7L;
256 sha_info->digest[7] = 0xbefa4fa4L;
257 sha_info->count_lo = 0L;
258 sha_info->count_hi = 0L;
259 sha_info->local = 0;
260 sha_info->digestsize = 28;
261}
262
263
264/* update the SHA digest */
265
266static void
267sha_update(SHAobject *sha_info, SHA_BYTE *buffer, int count)
268{
269 int i;
270 SHA_INT32 clo;
271
272 clo = sha_info->count_lo + ((SHA_INT32) count << 3);
273 if (clo < sha_info->count_lo) {
274 ++sha_info->count_hi;
275 }
276 sha_info->count_lo = clo;
277 sha_info->count_hi += (SHA_INT32) count >> 29;
278 if (sha_info->local) {
279 i = SHA_BLOCKSIZE - sha_info->local;
280 if (i > count) {
281 i = count;
282 }
283 memcpy(((SHA_BYTE *) sha_info->data) + sha_info->local, buffer, i);
284 count -= i;
285 buffer += i;
286 sha_info->local += i;
287 if (sha_info->local == SHA_BLOCKSIZE) {
288 sha_transform(sha_info);
289 }
290 else {
291 return;
292 }
293 }
294 while (count >= SHA_BLOCKSIZE) {
295 memcpy(sha_info->data, buffer, SHA_BLOCKSIZE);
296 buffer += SHA_BLOCKSIZE;
297 count -= SHA_BLOCKSIZE;
298 sha_transform(sha_info);
299 }
300 memcpy(sha_info->data, buffer, count);
301 sha_info->local = count;
302}
303
304/* finish computing the SHA digest */
305
306static void
307sha_final(unsigned char digest[SHA_DIGESTSIZE], SHAobject *sha_info)
308{
309 int count;
310 SHA_INT32 lo_bit_count, hi_bit_count;
311
312 lo_bit_count = sha_info->count_lo;
313 hi_bit_count = sha_info->count_hi;
314 count = (int) ((lo_bit_count >> 3) & 0x3f);
315 ((SHA_BYTE *) sha_info->data)[count++] = 0x80;
316 if (count > SHA_BLOCKSIZE - 8) {
[391]317 memset(((SHA_BYTE *) sha_info->data) + count, 0,
318 SHA_BLOCKSIZE - count);
319 sha_transform(sha_info);
320 memset((SHA_BYTE *) sha_info->data, 0, SHA_BLOCKSIZE - 8);
[2]321 }
322 else {
[391]323 memset(((SHA_BYTE *) sha_info->data) + count, 0,
324 SHA_BLOCKSIZE - 8 - count);
[2]325 }
326
327 /* GJS: note that we add the hi/lo in big-endian. sha_transform will
328 swap these values into host-order. */
329 sha_info->data[56] = (hi_bit_count >> 24) & 0xff;
330 sha_info->data[57] = (hi_bit_count >> 16) & 0xff;
331 sha_info->data[58] = (hi_bit_count >> 8) & 0xff;
332 sha_info->data[59] = (hi_bit_count >> 0) & 0xff;
333 sha_info->data[60] = (lo_bit_count >> 24) & 0xff;
334 sha_info->data[61] = (lo_bit_count >> 16) & 0xff;
335 sha_info->data[62] = (lo_bit_count >> 8) & 0xff;
336 sha_info->data[63] = (lo_bit_count >> 0) & 0xff;
337 sha_transform(sha_info);
338 digest[ 0] = (unsigned char) ((sha_info->digest[0] >> 24) & 0xff);
339 digest[ 1] = (unsigned char) ((sha_info->digest[0] >> 16) & 0xff);
340 digest[ 2] = (unsigned char) ((sha_info->digest[0] >> 8) & 0xff);
341 digest[ 3] = (unsigned char) ((sha_info->digest[0] ) & 0xff);
342 digest[ 4] = (unsigned char) ((sha_info->digest[1] >> 24) & 0xff);
343 digest[ 5] = (unsigned char) ((sha_info->digest[1] >> 16) & 0xff);
344 digest[ 6] = (unsigned char) ((sha_info->digest[1] >> 8) & 0xff);
345 digest[ 7] = (unsigned char) ((sha_info->digest[1] ) & 0xff);
346 digest[ 8] = (unsigned char) ((sha_info->digest[2] >> 24) & 0xff);
347 digest[ 9] = (unsigned char) ((sha_info->digest[2] >> 16) & 0xff);
348 digest[10] = (unsigned char) ((sha_info->digest[2] >> 8) & 0xff);
349 digest[11] = (unsigned char) ((sha_info->digest[2] ) & 0xff);
350 digest[12] = (unsigned char) ((sha_info->digest[3] >> 24) & 0xff);
351 digest[13] = (unsigned char) ((sha_info->digest[3] >> 16) & 0xff);
352 digest[14] = (unsigned char) ((sha_info->digest[3] >> 8) & 0xff);
353 digest[15] = (unsigned char) ((sha_info->digest[3] ) & 0xff);
354 digest[16] = (unsigned char) ((sha_info->digest[4] >> 24) & 0xff);
355 digest[17] = (unsigned char) ((sha_info->digest[4] >> 16) & 0xff);
356 digest[18] = (unsigned char) ((sha_info->digest[4] >> 8) & 0xff);
357 digest[19] = (unsigned char) ((sha_info->digest[4] ) & 0xff);
358 digest[20] = (unsigned char) ((sha_info->digest[5] >> 24) & 0xff);
359 digest[21] = (unsigned char) ((sha_info->digest[5] >> 16) & 0xff);
360 digest[22] = (unsigned char) ((sha_info->digest[5] >> 8) & 0xff);
361 digest[23] = (unsigned char) ((sha_info->digest[5] ) & 0xff);
362 digest[24] = (unsigned char) ((sha_info->digest[6] >> 24) & 0xff);
363 digest[25] = (unsigned char) ((sha_info->digest[6] >> 16) & 0xff);
364 digest[26] = (unsigned char) ((sha_info->digest[6] >> 8) & 0xff);
365 digest[27] = (unsigned char) ((sha_info->digest[6] ) & 0xff);
366 digest[28] = (unsigned char) ((sha_info->digest[7] >> 24) & 0xff);
367 digest[29] = (unsigned char) ((sha_info->digest[7] >> 16) & 0xff);
368 digest[30] = (unsigned char) ((sha_info->digest[7] >> 8) & 0xff);
369 digest[31] = (unsigned char) ((sha_info->digest[7] ) & 0xff);
370}
371
372/*
373 * End of copied SHA code.
374 *
375 * ------------------------------------------------------------------------
376 */
377
378static PyTypeObject SHA224type;
379static PyTypeObject SHA256type;
380
381
382static SHAobject *
383newSHA224object(void)
384{
385 return (SHAobject *)PyObject_New(SHAobject, &SHA224type);
386}
387
388static SHAobject *
389newSHA256object(void)
390{
391 return (SHAobject *)PyObject_New(SHAobject, &SHA256type);
392}
393
394/* Internal methods for a hash object */
395
396static void
397SHA_dealloc(PyObject *ptr)
398{
399 PyObject_Del(ptr);
400}
401
402
403/* External methods for a hash object */
404
405PyDoc_STRVAR(SHA256_copy__doc__, "Return a copy of the hash object.");
406
407static PyObject *
408SHA256_copy(SHAobject *self, PyObject *unused)
409{
410 SHAobject *newobj;
411
412 if (Py_TYPE(self) == &SHA256type) {
413 if ( (newobj = newSHA256object())==NULL)
414 return NULL;
415 } else {
416 if ( (newobj = newSHA224object())==NULL)
417 return NULL;
418 }
419
420 SHAcopy(self, newobj);
421 return (PyObject *)newobj;
422}
423
424PyDoc_STRVAR(SHA256_digest__doc__,
425"Return the digest value as a string of binary data.");
426
427static PyObject *
428SHA256_digest(SHAobject *self, PyObject *unused)
429{
430 unsigned char digest[SHA_DIGESTSIZE];
431 SHAobject temp;
432
433 SHAcopy(self, &temp);
434 sha_final(digest, &temp);
435 return PyString_FromStringAndSize((const char *)digest, self->digestsize);
436}
437
438PyDoc_STRVAR(SHA256_hexdigest__doc__,
439"Return the digest value as a string of hexadecimal digits.");
440
441static PyObject *
442SHA256_hexdigest(SHAobject *self, PyObject *unused)
443{
444 unsigned char digest[SHA_DIGESTSIZE];
445 SHAobject temp;
446 PyObject *retval;
447 char *hex_digest;
448 int i, j;
449
450 /* Get the raw (binary) digest value */
451 SHAcopy(self, &temp);
452 sha_final(digest, &temp);
453
454 /* Create a new string */
455 retval = PyString_FromStringAndSize(NULL, self->digestsize * 2);
456 if (!retval)
[391]457 return NULL;
[2]458 hex_digest = PyString_AsString(retval);
459 if (!hex_digest) {
[391]460 Py_DECREF(retval);
461 return NULL;
[2]462 }
463
464 /* Make hex version of the digest */
465 for(i=j=0; i<self->digestsize; i++) {
466 char c;
467 c = (digest[i] >> 4) & 0xf;
[391]468 c = (c>9) ? c+'a'-10 : c + '0';
[2]469 hex_digest[j++] = c;
470 c = (digest[i] & 0xf);
[391]471 c = (c>9) ? c+'a'-10 : c + '0';
[2]472 hex_digest[j++] = c;
473 }
474 return retval;
475}
476
477PyDoc_STRVAR(SHA256_update__doc__,
478"Update this hash object's state with the provided string.");
479
480static PyObject *
481SHA256_update(SHAobject *self, PyObject *args)
482{
[391]483 Py_buffer buf;
[2]484
[391]485 if (!PyArg_ParseTuple(args, "s*:update", &buf))
[2]486 return NULL;
487
[391]488 sha_update(self, buf.buf, buf.len);
[2]489
[391]490 PyBuffer_Release(&buf);
491 Py_RETURN_NONE;
[2]492}
493
494static PyMethodDef SHA_methods[] = {
[391]495 {"copy", (PyCFunction)SHA256_copy, METH_NOARGS, SHA256_copy__doc__},
496 {"digest", (PyCFunction)SHA256_digest, METH_NOARGS, SHA256_digest__doc__},
[2]497 {"hexdigest", (PyCFunction)SHA256_hexdigest, METH_NOARGS, SHA256_hexdigest__doc__},
[391]498 {"update", (PyCFunction)SHA256_update, METH_VARARGS, SHA256_update__doc__},
499 {NULL, NULL} /* sentinel */
[2]500};
501
502static PyObject *
503SHA256_get_block_size(PyObject *self, void *closure)
504{
505 return PyInt_FromLong(SHA_BLOCKSIZE);
506}
507
508static PyObject *
509SHA256_get_name(PyObject *self, void *closure)
510{
511 if (((SHAobject *)self)->digestsize == 32)
512 return PyString_FromStringAndSize("SHA256", 6);
513 else
514 return PyString_FromStringAndSize("SHA224", 6);
515}
516
517static PyGetSetDef SHA_getseters[] = {
518 {"block_size",
519 (getter)SHA256_get_block_size, NULL,
520 NULL,
521 NULL},
522 {"name",
523 (getter)SHA256_get_name, NULL,
524 NULL,
525 NULL},
526 {NULL} /* Sentinel */
527};
528
529static PyMemberDef SHA_members[] = {
530 {"digest_size", T_INT, offsetof(SHAobject, digestsize), READONLY, NULL},
531 /* the old md5 and sha modules support 'digest_size' as in PEP 247.
532 * the old sha module also supported 'digestsize'. ugh. */
533 {"digestsize", T_INT, offsetof(SHAobject, digestsize), READONLY, NULL},
534 {NULL} /* Sentinel */
535};
536
537static PyTypeObject SHA224type = {
538 PyVarObject_HEAD_INIT(NULL, 0)
[391]539 "_sha256.sha224", /*tp_name*/
540 sizeof(SHAobject), /*tp_size*/
541 0, /*tp_itemsize*/
[2]542 /* methods */
[391]543 SHA_dealloc, /*tp_dealloc*/
544 0, /*tp_print*/
545 0, /*tp_getattr*/
[2]546 0, /*tp_setattr*/
547 0, /*tp_compare*/
548 0, /*tp_repr*/
549 0, /*tp_as_number*/
550 0, /*tp_as_sequence*/
551 0, /*tp_as_mapping*/
552 0, /*tp_hash*/
553 0, /*tp_call*/
554 0, /*tp_str*/
555 0, /*tp_getattro*/
556 0, /*tp_setattro*/
557 0, /*tp_as_buffer*/
558 Py_TPFLAGS_DEFAULT, /*tp_flags*/
559 0, /*tp_doc*/
560 0, /*tp_traverse*/
[391]561 0, /*tp_clear*/
562 0, /*tp_richcompare*/
563 0, /*tp_weaklistoffset*/
564 0, /*tp_iter*/
565 0, /*tp_iternext*/
566 SHA_methods, /* tp_methods */
567 SHA_members, /* tp_members */
[2]568 SHA_getseters, /* tp_getset */
569};
570
571static PyTypeObject SHA256type = {
572 PyVarObject_HEAD_INIT(NULL, 0)
[391]573 "_sha256.sha256", /*tp_name*/
574 sizeof(SHAobject), /*tp_size*/
575 0, /*tp_itemsize*/
[2]576 /* methods */
[391]577 SHA_dealloc, /*tp_dealloc*/
578 0, /*tp_print*/
579 0, /*tp_getattr*/
[2]580 0, /*tp_setattr*/
581 0, /*tp_compare*/
582 0, /*tp_repr*/
583 0, /*tp_as_number*/
584 0, /*tp_as_sequence*/
585 0, /*tp_as_mapping*/
586 0, /*tp_hash*/
587 0, /*tp_call*/
588 0, /*tp_str*/
589 0, /*tp_getattro*/
590 0, /*tp_setattro*/
591 0, /*tp_as_buffer*/
592 Py_TPFLAGS_DEFAULT, /*tp_flags*/
593 0, /*tp_doc*/
594 0, /*tp_traverse*/
[391]595 0, /*tp_clear*/
596 0, /*tp_richcompare*/
597 0, /*tp_weaklistoffset*/
598 0, /*tp_iter*/
599 0, /*tp_iternext*/
600 SHA_methods, /* tp_methods */
601 SHA_members, /* tp_members */
[2]602 SHA_getseters, /* tp_getset */
603};
604
605
606/* The single module-level function: new() */
607
608PyDoc_STRVAR(SHA256_new__doc__,
609"Return a new SHA-256 hash object; optionally initialized with a string.");
610
611static PyObject *
612SHA256_new(PyObject *self, PyObject *args, PyObject *kwdict)
613{
614 static char *kwlist[] = {"string", NULL};
615 SHAobject *new;
[391]616 Py_buffer buf = { 0 };
[2]617
[391]618 if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|s*:new", kwlist,
619 &buf)) {
[2]620 return NULL;
621 }
622
[391]623 if ((new = newSHA256object()) == NULL) {
624 PyBuffer_Release(&buf);
[2]625 return NULL;
[391]626 }
[2]627
628 sha_init(new);
629
630 if (PyErr_Occurred()) {
631 Py_DECREF(new);
[391]632 PyBuffer_Release(&buf);
[2]633 return NULL;
634 }
[391]635 if (buf.len > 0) {
636 sha_update(new, buf.buf, buf.len);
637 }
638 PyBuffer_Release(&buf);
[2]639
640 return (PyObject *)new;
641}
642
643PyDoc_STRVAR(SHA224_new__doc__,
644"Return a new SHA-224 hash object; optionally initialized with a string.");
645
646static PyObject *
647SHA224_new(PyObject *self, PyObject *args, PyObject *kwdict)
648{
649 static char *kwlist[] = {"string", NULL};
650 SHAobject *new;
[391]651 Py_buffer buf = { 0 };
[2]652
[391]653 if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|s*:new", kwlist,
654 &buf)) {
[2]655 return NULL;
656 }
657
[391]658 if ((new = newSHA224object()) == NULL) {
659 PyBuffer_Release(&buf);
[2]660 return NULL;
[391]661 }
[2]662
663 sha224_init(new);
664
665 if (PyErr_Occurred()) {
666 Py_DECREF(new);
[391]667 PyBuffer_Release(&buf);
[2]668 return NULL;
669 }
[391]670 if (buf.len > 0) {
671 sha_update(new, buf.buf, buf.len);
672 }
673 PyBuffer_Release(&buf);
[2]674
675 return (PyObject *)new;
676}
677
678
679/* List of functions exported by this module */
680
681static struct PyMethodDef SHA_functions[] = {
682 {"sha256", (PyCFunction)SHA256_new, METH_VARARGS|METH_KEYWORDS, SHA256_new__doc__},
683 {"sha224", (PyCFunction)SHA224_new, METH_VARARGS|METH_KEYWORDS, SHA224_new__doc__},
[391]684 {NULL, NULL} /* Sentinel */
[2]685};
686
687
688/* Initialize this module. */
689
690#define insint(n,v) { PyModule_AddIntConstant(m,n,v); }
691
692PyMODINIT_FUNC
693init_sha256(void)
694{
695 PyObject *m;
696
697 Py_TYPE(&SHA224type) = &PyType_Type;
698 if (PyType_Ready(&SHA224type) < 0)
699 return;
700 Py_TYPE(&SHA256type) = &PyType_Type;
701 if (PyType_Ready(&SHA256type) < 0)
702 return;
703 m = Py_InitModule("_sha256", SHA_functions);
704 if (m == NULL)
[391]705 return;
[2]706}
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