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) 2005-2007 Gregory P. Smith (greg@krypto.org)
13 Licensed to PSF under a Contributor Agreement.
14
15 */
16
17 /* SHA objects */
18 #ifndef Py_BUILD_CORE_BUILTIN
19 # define Py_BUILD_CORE_MODULE 1
20 #endif
21
22 #include "Python.h"
23 #include "pycore_bitutils.h" // _Py_bswap32()
24 #include "pycore_strhex.h" // _Py_strhex()
25 #include "structmember.h" // PyMemberDef
26 #include "hashlib.h"
27
28 /*[clinic input]
29 module _sha256
30 class SHA256Type "SHAobject *" "&PyType_Type"
31 [clinic start generated code]*/
32 /*[clinic end generated code: output=da39a3ee5e6b4b0d input=71a39174d4f0a744]*/
33
34 /* Some useful types */
35
36 typedef unsigned char SHA_BYTE;
37 typedef uint32_t SHA_INT32; /* 32-bit integer */
38
39 /* The SHA block size and message digest sizes, in bytes */
40
41 #define SHA_BLOCKSIZE 64
42 #define SHA_DIGESTSIZE 32
43
44 /* The structure for storing SHA info */
45
46 typedef struct {
47 PyObject_HEAD
48 SHA_INT32 digest[8]; /* Message digest */
49 SHA_INT32 count_lo, count_hi; /* 64-bit bit count */
50 SHA_BYTE data[SHA_BLOCKSIZE]; /* SHA data buffer */
51 int local; /* unprocessed amount in data */
52 int digestsize;
53 } SHAobject;
54
55 #include "clinic/sha256module.c.h"
56
57 typedef struct {
58 PyTypeObject* sha224_type;
59 PyTypeObject* sha256_type;
60 } _sha256_state;
61
62 static inline _sha256_state*
63 _sha256_get_state(PyObject *module)
64 {
65 void *state = PyModule_GetState(module);
66 assert(state != NULL);
67 return (_sha256_state *)state;
68 }
69
70 /* When run on a little-endian CPU we need to perform byte reversal on an
71 array of longwords. */
72
73 #if PY_LITTLE_ENDIAN
74 static void longReverse(SHA_INT32 *buffer, int byteCount)
75 {
76 byteCount /= sizeof(*buffer);
77 for (; byteCount--; buffer++) {
78 *buffer = _Py_bswap32(*buffer);
79 }
80 }
81 #endif
82
83 static void SHAcopy(SHAobject *src, SHAobject *dest)
84 {
85 dest->local = src->local;
86 dest->digestsize = src->digestsize;
87 dest->count_lo = src->count_lo;
88 dest->count_hi = src->count_hi;
89 memcpy(dest->digest, src->digest, sizeof(src->digest));
90 memcpy(dest->data, src->data, sizeof(src->data));
91 }
92
93
94 /* ------------------------------------------------------------------------
95 *
96 * This code for the SHA-256 algorithm was noted as public domain. The
97 * original headers are pasted below.
98 *
99 * Several changes have been made to make it more compatible with the
100 * Python environment and desired interface.
101 *
102 */
103
104 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
105 *
106 * LibTomCrypt is a library that provides various cryptographic
107 * algorithms in a highly modular and flexible manner.
108 *
109 * The library is free for all purposes without any express
110 * guarantee it works.
111 *
112 * Tom St Denis, tomstdenis@iahu.ca, https://www.libtom.net
113 */
114
115
116 /* SHA256 by Tom St Denis */
117
118 /* Various logical functions */
119 #define ROR(x, y)\
120 ( ((((unsigned long)(x)&0xFFFFFFFFUL)>>(unsigned long)((y)&31)) | \
121 ((unsigned long)(x)<<(unsigned long)(32-((y)&31)))) & 0xFFFFFFFFUL)
122 #define Ch(x,y,z) (z ^ (x & (y ^ z)))
123 #define Maj(x,y,z) (((x | y) & z) | (x & y))
124 #define S(x, n) ROR((x),(n))
125 #define R(x, n) (((x)&0xFFFFFFFFUL)>>(n))
126 #define Sigma0(x) (S(x, 2) ^ S(x, 13) ^ S(x, 22))
127 #define Sigma1(x) (S(x, 6) ^ S(x, 11) ^ S(x, 25))
128 #define Gamma0(x) (S(x, 7) ^ S(x, 18) ^ R(x, 3))
129 #define Gamma1(x) (S(x, 17) ^ S(x, 19) ^ R(x, 10))
130
131
132 static void
133 sha_transform(SHAobject *sha_info)
134 {
135 int i;
136 SHA_INT32 S[8], W[64], t0, t1;
137
138 memcpy(W, sha_info->data, sizeof(sha_info->data));
139 #if PY_LITTLE_ENDIAN
140 longReverse(W, (int)sizeof(sha_info->data));
141 #endif
142
143 for (i = 16; i < 64; ++i) {
144 W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16];
145 }
146 for (i = 0; i < 8; ++i) {
147 S[i] = sha_info->digest[i];
148 }
149
150 /* Compress */
151 #define RND(a,b,c,d,e,f,g,h,i,ki) \
152 t0 = h + Sigma1(e) + Ch(e, f, g) + ki + W[i]; \
153 t1 = Sigma0(a) + Maj(a, b, c); \
154 d += t0; \
155 h = t0 + t1;
156
157 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],0,0x428a2f98);
158 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],1,0x71374491);
159 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],2,0xb5c0fbcf);
160 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],3,0xe9b5dba5);
161 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],4,0x3956c25b);
162 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],5,0x59f111f1);
163 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],6,0x923f82a4);
164 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],7,0xab1c5ed5);
165 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],8,0xd807aa98);
166 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],9,0x12835b01);
167 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],10,0x243185be);
168 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],11,0x550c7dc3);
169 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],12,0x72be5d74);
170 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],13,0x80deb1fe);
171 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],14,0x9bdc06a7);
172 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],15,0xc19bf174);
173 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],16,0xe49b69c1);
174 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],17,0xefbe4786);
175 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],18,0x0fc19dc6);
176 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],19,0x240ca1cc);
177 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],20,0x2de92c6f);
178 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],21,0x4a7484aa);
179 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],22,0x5cb0a9dc);
180 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],23,0x76f988da);
181 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],24,0x983e5152);
182 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],25,0xa831c66d);
183 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],26,0xb00327c8);
184 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],27,0xbf597fc7);
185 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],28,0xc6e00bf3);
186 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],29,0xd5a79147);
187 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],30,0x06ca6351);
188 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],31,0x14292967);
189 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],32,0x27b70a85);
190 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],33,0x2e1b2138);
191 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],34,0x4d2c6dfc);
192 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],35,0x53380d13);
193 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],36,0x650a7354);
194 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],37,0x766a0abb);
195 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],38,0x81c2c92e);
196 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],39,0x92722c85);
197 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],40,0xa2bfe8a1);
198 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],41,0xa81a664b);
199 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],42,0xc24b8b70);
200 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],43,0xc76c51a3);
201 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],44,0xd192e819);
202 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],45,0xd6990624);
203 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],46,0xf40e3585);
204 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],47,0x106aa070);
205 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],48,0x19a4c116);
206 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],49,0x1e376c08);
207 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],50,0x2748774c);
208 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],51,0x34b0bcb5);
209 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],52,0x391c0cb3);
210 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],53,0x4ed8aa4a);
211 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],54,0x5b9cca4f);
212 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],55,0x682e6ff3);
213 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],56,0x748f82ee);
214 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],57,0x78a5636f);
215 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],58,0x84c87814);
216 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],59,0x8cc70208);
217 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],60,0x90befffa);
218 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],61,0xa4506ceb);
219 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],62,0xbef9a3f7);
220 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],63,0xc67178f2);
221
222 #undef RND
223
224 /* feedback */
225 for (i = 0; i < 8; i++) {
226 sha_info->digest[i] = sha_info->digest[i] + S[i];
227 }
228
229 }
230
231
232
233 /* initialize the SHA digest */
234
235 static void
236 sha_init(SHAobject *sha_info)
237 {
238 sha_info->digest[0] = 0x6A09E667L;
239 sha_info->digest[1] = 0xBB67AE85L;
240 sha_info->digest[2] = 0x3C6EF372L;
241 sha_info->digest[3] = 0xA54FF53AL;
242 sha_info->digest[4] = 0x510E527FL;
243 sha_info->digest[5] = 0x9B05688CL;
244 sha_info->digest[6] = 0x1F83D9ABL;
245 sha_info->digest[7] = 0x5BE0CD19L;
246 sha_info->count_lo = 0L;
247 sha_info->count_hi = 0L;
248 sha_info->local = 0;
249 sha_info->digestsize = 32;
250 }
251
252 static void
253 sha224_init(SHAobject *sha_info)
254 {
255 sha_info->digest[0] = 0xc1059ed8L;
256 sha_info->digest[1] = 0x367cd507L;
257 sha_info->digest[2] = 0x3070dd17L;
258 sha_info->digest[3] = 0xf70e5939L;
259 sha_info->digest[4] = 0xffc00b31L;
260 sha_info->digest[5] = 0x68581511L;
261 sha_info->digest[6] = 0x64f98fa7L;
262 sha_info->digest[7] = 0xbefa4fa4L;
263 sha_info->count_lo = 0L;
264 sha_info->count_hi = 0L;
265 sha_info->local = 0;
266 sha_info->digestsize = 28;
267 }
268
269
270 /* update the SHA digest */
271
272 static void
273 sha_update(SHAobject *sha_info, SHA_BYTE *buffer, Py_ssize_t count)
274 {
275 Py_ssize_t i;
276 SHA_INT32 clo;
277
278 clo = sha_info->count_lo + ((SHA_INT32) count << 3);
279 if (clo < sha_info->count_lo) {
280 ++sha_info->count_hi;
281 }
282 sha_info->count_lo = clo;
283 sha_info->count_hi += (SHA_INT32) count >> 29;
284 if (sha_info->local) {
285 i = SHA_BLOCKSIZE - sha_info->local;
286 if (i > count) {
287 i = count;
288 }
289 memcpy(((SHA_BYTE *) sha_info->data) + sha_info->local, buffer, i);
290 count -= i;
291 buffer += i;
292 sha_info->local += (int)i;
293 if (sha_info->local == SHA_BLOCKSIZE) {
294 sha_transform(sha_info);
295 }
296 else {
297 return;
298 }
299 }
300 while (count >= SHA_BLOCKSIZE) {
301 memcpy(sha_info->data, buffer, SHA_BLOCKSIZE);
302 buffer += SHA_BLOCKSIZE;
303 count -= SHA_BLOCKSIZE;
304 sha_transform(sha_info);
305 }
306 memcpy(sha_info->data, buffer, count);
307 sha_info->local = (int)count;
308 }
309
310 /* finish computing the SHA digest */
311
312 static void
313 sha_final(unsigned char digest[SHA_DIGESTSIZE], SHAobject *sha_info)
314 {
315 int count;
316 SHA_INT32 lo_bit_count, hi_bit_count;
317
318 lo_bit_count = sha_info->count_lo;
319 hi_bit_count = sha_info->count_hi;
320 count = (int) ((lo_bit_count >> 3) & 0x3f);
321 ((SHA_BYTE *) sha_info->data)[count++] = 0x80;
322 if (count > SHA_BLOCKSIZE - 8) {
323 memset(((SHA_BYTE *) sha_info->data) + count, 0,
324 SHA_BLOCKSIZE - count);
325 sha_transform(sha_info);
326 memset((SHA_BYTE *) sha_info->data, 0, SHA_BLOCKSIZE - 8);
327 }
328 else {
329 memset(((SHA_BYTE *) sha_info->data) + count, 0,
330 SHA_BLOCKSIZE - 8 - count);
331 }
332
333 /* GJS: note that we add the hi/lo in big-endian. sha_transform will
334 swap these values into host-order. */
335 sha_info->data[56] = (hi_bit_count >> 24) & 0xff;
336 sha_info->data[57] = (hi_bit_count >> 16) & 0xff;
337 sha_info->data[58] = (hi_bit_count >> 8) & 0xff;
338 sha_info->data[59] = (hi_bit_count >> 0) & 0xff;
339 sha_info->data[60] = (lo_bit_count >> 24) & 0xff;
340 sha_info->data[61] = (lo_bit_count >> 16) & 0xff;
341 sha_info->data[62] = (lo_bit_count >> 8) & 0xff;
342 sha_info->data[63] = (lo_bit_count >> 0) & 0xff;
343 sha_transform(sha_info);
344 digest[ 0] = (unsigned char) ((sha_info->digest[0] >> 24) & 0xff);
345 digest[ 1] = (unsigned char) ((sha_info->digest[0] >> 16) & 0xff);
346 digest[ 2] = (unsigned char) ((sha_info->digest[0] >> 8) & 0xff);
347 digest[ 3] = (unsigned char) ((sha_info->digest[0] ) & 0xff);
348 digest[ 4] = (unsigned char) ((sha_info->digest[1] >> 24) & 0xff);
349 digest[ 5] = (unsigned char) ((sha_info->digest[1] >> 16) & 0xff);
350 digest[ 6] = (unsigned char) ((sha_info->digest[1] >> 8) & 0xff);
351 digest[ 7] = (unsigned char) ((sha_info->digest[1] ) & 0xff);
352 digest[ 8] = (unsigned char) ((sha_info->digest[2] >> 24) & 0xff);
353 digest[ 9] = (unsigned char) ((sha_info->digest[2] >> 16) & 0xff);
354 digest[10] = (unsigned char) ((sha_info->digest[2] >> 8) & 0xff);
355 digest[11] = (unsigned char) ((sha_info->digest[2] ) & 0xff);
356 digest[12] = (unsigned char) ((sha_info->digest[3] >> 24) & 0xff);
357 digest[13] = (unsigned char) ((sha_info->digest[3] >> 16) & 0xff);
358 digest[14] = (unsigned char) ((sha_info->digest[3] >> 8) & 0xff);
359 digest[15] = (unsigned char) ((sha_info->digest[3] ) & 0xff);
360 digest[16] = (unsigned char) ((sha_info->digest[4] >> 24) & 0xff);
361 digest[17] = (unsigned char) ((sha_info->digest[4] >> 16) & 0xff);
362 digest[18] = (unsigned char) ((sha_info->digest[4] >> 8) & 0xff);
363 digest[19] = (unsigned char) ((sha_info->digest[4] ) & 0xff);
364 digest[20] = (unsigned char) ((sha_info->digest[5] >> 24) & 0xff);
365 digest[21] = (unsigned char) ((sha_info->digest[5] >> 16) & 0xff);
366 digest[22] = (unsigned char) ((sha_info->digest[5] >> 8) & 0xff);
367 digest[23] = (unsigned char) ((sha_info->digest[5] ) & 0xff);
368 digest[24] = (unsigned char) ((sha_info->digest[6] >> 24) & 0xff);
369 digest[25] = (unsigned char) ((sha_info->digest[6] >> 16) & 0xff);
370 digest[26] = (unsigned char) ((sha_info->digest[6] >> 8) & 0xff);
371 digest[27] = (unsigned char) ((sha_info->digest[6] ) & 0xff);
372 digest[28] = (unsigned char) ((sha_info->digest[7] >> 24) & 0xff);
373 digest[29] = (unsigned char) ((sha_info->digest[7] >> 16) & 0xff);
374 digest[30] = (unsigned char) ((sha_info->digest[7] >> 8) & 0xff);
375 digest[31] = (unsigned char) ((sha_info->digest[7] ) & 0xff);
376 }
377
378 /*
379 * End of copied SHA code.
380 *
381 * ------------------------------------------------------------------------
382 */
383
384
385 static SHAobject *
386 newSHA224object(_sha256_state *state)
387 {
388 SHAobject *sha = (SHAobject *)PyObject_GC_New(SHAobject,
389 state->sha224_type);
390 PyObject_GC_Track(sha);
391 return sha;
392 }
393
394 static SHAobject *
395 newSHA256object(_sha256_state *state)
396 {
397 SHAobject *sha = (SHAobject *)PyObject_GC_New(SHAobject,
398 state->sha256_type);
399 PyObject_GC_Track(sha);
400 return sha;
401 }
402
403 /* Internal methods for a hash object */
404 static int
405 SHA_traverse(PyObject *ptr, visitproc visit, void *arg)
406 {
407 Py_VISIT(Py_TYPE(ptr));
408 return 0;
409 }
410
411 static void
412 SHA_dealloc(PyObject *ptr)
413 {
414 PyTypeObject *tp = Py_TYPE(ptr);
415 PyObject_GC_UnTrack(ptr);
416 PyObject_GC_Del(ptr);
417 Py_DECREF(tp);
418 }
419
420
421 /* External methods for a hash object */
422
423 /*[clinic input]
424 SHA256Type.copy
425
426 cls:defining_class
427
428 Return a copy of the hash object.
429 [clinic start generated code]*/
430
431 static PyObject *
432 SHA256Type_copy_impl(SHAobject *self, PyTypeObject *cls)
433 /*[clinic end generated code: output=9273f92c382be12f input=3137146fcb88e212]*/
434 {
435 SHAobject *newobj;
436 _sha256_state *state = PyType_GetModuleState(cls);
437 if (Py_IS_TYPE(self, state->sha256_type)) {
438 if ( (newobj = newSHA256object(state)) == NULL) {
439 return NULL;
440 }
441 } else {
442 if ( (newobj = newSHA224object(state))==NULL) {
443 return NULL;
444 }
445 }
446
447 SHAcopy(self, newobj);
448 return (PyObject *)newobj;
449 }
450
451 /*[clinic input]
452 SHA256Type.digest
453
454 Return the digest value as a bytes object.
455 [clinic start generated code]*/
456
457 static PyObject *
458 SHA256Type_digest_impl(SHAobject *self)
459 /*[clinic end generated code: output=46616a5e909fbc3d input=f1f4cfea5cbde35c]*/
460 {
461 unsigned char digest[SHA_DIGESTSIZE];
462 SHAobject temp;
463
464 SHAcopy(self, &temp);
465 sha_final(digest, &temp);
466 return PyBytes_FromStringAndSize((const char *)digest, self->digestsize);
467 }
468
469 /*[clinic input]
470 SHA256Type.hexdigest
471
472 Return the digest value as a string of hexadecimal digits.
473 [clinic start generated code]*/
474
475 static PyObject *
476 SHA256Type_hexdigest_impl(SHAobject *self)
477 /*[clinic end generated code: output=725f8a7041ae97f3 input=0cc4c714693010d1]*/
478 {
479 unsigned char digest[SHA_DIGESTSIZE];
480 SHAobject temp;
481
482 /* Get the raw (binary) digest value */
483 SHAcopy(self, &temp);
484 sha_final(digest, &temp);
485
486 return _Py_strhex((const char *)digest, self->digestsize);
487 }
488
489 /*[clinic input]
490 SHA256Type.update
491
492 obj: object
493 /
494
495 Update this hash object's state with the provided string.
496 [clinic start generated code]*/
497
498 static PyObject *
499 SHA256Type_update(SHAobject *self, PyObject *obj)
500 /*[clinic end generated code: output=0967fb2860c66af7 input=b2d449d5b30f0f5a]*/
501 {
502 Py_buffer buf;
503
504 GET_BUFFER_VIEW_OR_ERROUT(obj, &buf);
505
506 sha_update(self, buf.buf, buf.len);
507
508 PyBuffer_Release(&buf);
509 Py_RETURN_NONE;
510 }
511
512 static PyMethodDef SHA_methods[] = {
513 SHA256TYPE_COPY_METHODDEF
514 SHA256TYPE_DIGEST_METHODDEF
515 SHA256TYPE_HEXDIGEST_METHODDEF
516 SHA256TYPE_UPDATE_METHODDEF
517 {NULL, NULL} /* sentinel */
518 };
519
520 static PyObject *
521 SHA256_get_block_size(PyObject *self, void *closure)
522 {
523 return PyLong_FromLong(SHA_BLOCKSIZE);
524 }
525
526 static PyObject *
527 SHA256_get_name(PyObject *self, void *closure)
528 {
529 if (((SHAobject *)self)->digestsize == 32)
530 return PyUnicode_FromStringAndSize("sha256", 6);
531 else
532 return PyUnicode_FromStringAndSize("sha224", 6);
533 }
534
535 static PyGetSetDef SHA_getseters[] = {
536 {"block_size",
537 (getter)SHA256_get_block_size, NULL,
538 NULL,
539 NULL},
540 {"name",
541 (getter)SHA256_get_name, NULL,
542 NULL,
543 NULL},
544 {NULL} /* Sentinel */
545 };
546
547 static PyMemberDef SHA_members[] = {
548 {"digest_size", T_INT, offsetof(SHAobject, digestsize), READONLY, NULL},
549 {NULL} /* Sentinel */
550 };
551
552 static PyType_Slot sha256_types_slots[] = {
553 {Py_tp_dealloc, SHA_dealloc},
554 {Py_tp_methods, SHA_methods},
555 {Py_tp_members, SHA_members},
556 {Py_tp_getset, SHA_getseters},
557 {Py_tp_traverse, SHA_traverse},
558 {0,0}
559 };
560
561 static PyType_Spec sha224_type_spec = {
562 .name = "_sha256.sha224",
563 .basicsize = sizeof(SHAobject),
564 .flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_DISALLOW_INSTANTIATION |
565 Py_TPFLAGS_IMMUTABLETYPE | Py_TPFLAGS_HAVE_GC),
566 .slots = sha256_types_slots
567 };
568
569 static PyType_Spec sha256_type_spec = {
570 .name = "_sha256.sha256",
571 .basicsize = sizeof(SHAobject),
572 .flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_DISALLOW_INSTANTIATION |
573 Py_TPFLAGS_IMMUTABLETYPE | Py_TPFLAGS_HAVE_GC),
574 .slots = sha256_types_slots
575 };
576
577 /* The single module-level function: new() */
578
579 /*[clinic input]
580 _sha256.sha256
581
582 string: object(c_default="NULL") = b''
583 *
584 usedforsecurity: bool = True
585
586 Return a new SHA-256 hash object; optionally initialized with a string.
587 [clinic start generated code]*/
588
589 static PyObject *
590 _sha256_sha256_impl(PyObject *module, PyObject *string, int usedforsecurity)
591 /*[clinic end generated code: output=a1de327e8e1185cf input=9be86301aeb14ea5]*/
592 {
593 Py_buffer buf;
594
595 if (string) {
596 GET_BUFFER_VIEW_OR_ERROUT(string, &buf);
597 }
598
599 _sha256_state *state = PyModule_GetState(module);
600
601 SHAobject *new;
602 if ((new = newSHA256object(state)) == NULL) {
603 if (string) {
604 PyBuffer_Release(&buf);
605 }
606 return NULL;
607 }
608
609 sha_init(new);
610
611 if (PyErr_Occurred()) {
612 Py_DECREF(new);
613 if (string) {
614 PyBuffer_Release(&buf);
615 }
616 return NULL;
617 }
618 if (string) {
619 sha_update(new, buf.buf, buf.len);
620 PyBuffer_Release(&buf);
621 }
622
623 return (PyObject *)new;
624 }
625
626 /*[clinic input]
627 _sha256.sha224
628
629 string: object(c_default="NULL") = b''
630 *
631 usedforsecurity: bool = True
632
633 Return a new SHA-224 hash object; optionally initialized with a string.
634 [clinic start generated code]*/
635
636 static PyObject *
637 _sha256_sha224_impl(PyObject *module, PyObject *string, int usedforsecurity)
638 /*[clinic end generated code: output=08be6b36569bc69c input=9fcfb46e460860ac]*/
639 {
640 Py_buffer buf;
641 if (string) {
642 GET_BUFFER_VIEW_OR_ERROUT(string, &buf);
643 }
644
645 _sha256_state *state = PyModule_GetState(module);
646 SHAobject *new;
647 if ((new = newSHA224object(state)) == NULL) {
648 if (string) {
649 PyBuffer_Release(&buf);
650 }
651 return NULL;
652 }
653
654 sha224_init(new);
655
656 if (PyErr_Occurred()) {
657 Py_DECREF(new);
658 if (string) {
659 PyBuffer_Release(&buf);
660 }
661 return NULL;
662 }
663 if (string) {
664 sha_update(new, buf.buf, buf.len);
665 PyBuffer_Release(&buf);
666 }
667
668 return (PyObject *)new;
669 }
670
671
672 /* List of functions exported by this module */
673
674 static struct PyMethodDef SHA_functions[] = {
675 _SHA256_SHA256_METHODDEF
676 _SHA256_SHA224_METHODDEF
677 {NULL, NULL} /* Sentinel */
678 };
679
680 static int
681 _sha256_traverse(PyObject *module, visitproc visit, void *arg)
682 {
683 _sha256_state *state = _sha256_get_state(module);
684 Py_VISIT(state->sha224_type);
685 Py_VISIT(state->sha256_type);
686 return 0;
687 }
688
689 static int
690 _sha256_clear(PyObject *module)
691 {
692 _sha256_state *state = _sha256_get_state(module);
693 Py_CLEAR(state->sha224_type);
694 Py_CLEAR(state->sha256_type);
695 return 0;
696 }
697
698 static void
699 _sha256_free(void *module)
700 {
701 _sha256_clear((PyObject *)module);
702 }
703
704 static int sha256_exec(PyObject *module)
705 {
706 _sha256_state *state = _sha256_get_state(module);
707
708 state->sha224_type = (PyTypeObject *)PyType_FromModuleAndSpec(
709 module, &sha224_type_spec, NULL);
710
711 if (state->sha224_type == NULL) {
712 return -1;
713 }
714
715 state->sha256_type = (PyTypeObject *)PyType_FromModuleAndSpec(
716 module, &sha256_type_spec, NULL);
717
718 if (state->sha256_type == NULL) {
719 return -1;
720 }
721
722 Py_INCREF((PyObject *)state->sha224_type);
723 if (PyModule_AddObject(module, "SHA224Type", (PyObject *)state->sha224_type) < 0) {
724 Py_DECREF((PyObject *)state->sha224_type);
725 return -1;
726 }
727 Py_INCREF((PyObject *)state->sha256_type);
728 if (PyModule_AddObject(module, "SHA256Type", (PyObject *)state->sha256_type) < 0) {
729 Py_DECREF((PyObject *)state->sha256_type);
730 return -1;
731 }
732 return 0;
733 }
734
735 static PyModuleDef_Slot _sha256_slots[] = {
736 {Py_mod_exec, sha256_exec},
737 {0, NULL}
738 };
739
740 static struct PyModuleDef _sha256module = {
741 PyModuleDef_HEAD_INIT,
742 .m_name = "_sha256",
743 .m_size = sizeof(_sha256_state),
744 .m_methods = SHA_functions,
745 .m_slots = _sha256_slots,
746 .m_traverse = _sha256_traverse,
747 .m_clear = _sha256_clear,
748 .m_free = _sha256_free
749 };
750
751 /* Initialize this module. */
752 PyMODINIT_FUNC
753 PyInit__sha256(void)
754 {
755 return PyModuleDef_Init(&_sha256module);
756 }