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Guido van Rossum29d2acc1999-03-24 19:03:59 +00001/* SHA module */
2
3/* This module provides an interface to NIST's Secure Hash Algorithm */
4
5/* See below for information about the original code this module was
6 based upon. Additional work performed by:
7
Andrew M. Kuchlinga4e9a332000-08-01 01:26:02 +00008 Andrew Kuchling (amk1@bigfoot.com)
Guido van Rossum29d2acc1999-03-24 19:03:59 +00009 Greg Stein (gstein@lyra.org)
10*/
11
12/* SHA objects */
13
14#include "Python.h"
15
16
17/* Endianness testing and definitions */
18#define TestEndianness(variable) {int i=1; variable=PCT_BIG_ENDIAN;\
19 if (*((char*)&i)==1) variable=PCT_LITTLE_ENDIAN;}
20
21#define PCT_LITTLE_ENDIAN 1
22#define PCT_BIG_ENDIAN 0
23
24/* Some useful types */
25
26typedef unsigned char SHA_BYTE;
27
28#if SIZEOF_INT == 4
29typedef unsigned int SHA_INT32; /* 32-bit integer */
30#else
31/* not defined. compilation will die. */
32#endif
33
34/* The SHA block size and message digest sizes, in bytes */
35
36#define SHA_BLOCKSIZE 64
37#define SHA_DIGESTSIZE 20
38
39/* The structure for storing SHS info */
40
41typedef struct {
Fred Drake2c4a3dc2000-07-08 06:41:03 +000042 PyObject_HEAD
43 SHA_INT32 digest[5]; /* Message digest */
44 SHA_INT32 count_lo, count_hi; /* 64-bit bit count */
45 SHA_BYTE data[SHA_BLOCKSIZE]; /* SHA data buffer */
46 int Endianness;
47 int local; /* unprocessed amount in data */
Guido van Rossum29d2acc1999-03-24 19:03:59 +000048} SHAobject;
49
50/* When run on a little-endian CPU we need to perform byte reversal on an
51 array of longwords. */
52
Fred Drake2c4a3dc2000-07-08 06:41:03 +000053static void longReverse(SHA_INT32 *buffer, int byteCount, int Endianness)
Guido van Rossum29d2acc1999-03-24 19:03:59 +000054{
55 SHA_INT32 value;
56
57 if ( Endianness == PCT_BIG_ENDIAN )
58 return;
59
60 byteCount /= sizeof(*buffer);
Fred Drake2c4a3dc2000-07-08 06:41:03 +000061 while (byteCount--) {
Guido van Rossum29d2acc1999-03-24 19:03:59 +000062 value = *buffer;
63 value = ( ( value & 0xFF00FF00L ) >> 8 ) | \
64 ( ( value & 0x00FF00FFL ) << 8 );
65 *buffer++ = ( value << 16 ) | ( value >> 16 );
66 }
67}
68
Fred Drake2c4a3dc2000-07-08 06:41:03 +000069static void SHAcopy(SHAobject *src, SHAobject *dest)
Guido van Rossum29d2acc1999-03-24 19:03:59 +000070{
Fred Drake2c4a3dc2000-07-08 06:41:03 +000071 dest->Endianness = src->Endianness;
72 dest->local = src->local;
73 dest->count_lo = src->count_lo;
74 dest->count_hi = src->count_hi;
75 memcpy(dest->digest, src->digest, sizeof(src->digest));
76 memcpy(dest->data, src->data, sizeof(src->data));
Guido van Rossum29d2acc1999-03-24 19:03:59 +000077}
78
79
80/* ------------------------------------------------------------------------
81 *
82 * This code for the SHA algorithm was noted as public domain. The original
83 * headers are pasted below.
84 *
85 * Several changes have been made to make it more compatible with the
86 * Python environment and desired interface.
87 *
88 */
89
90/* NIST Secure Hash Algorithm */
91/* heavily modified by Uwe Hollerbach <uh@alumni.caltech edu> */
92/* from Peter C. Gutmann's implementation as found in */
93/* Applied Cryptography by Bruce Schneier */
94/* Further modifications to include the "UNRAVEL" stuff, below */
95
96/* This code is in the public domain */
97
98/* UNRAVEL should be fastest & biggest */
99/* UNROLL_LOOPS should be just as big, but slightly slower */
100/* both undefined should be smallest and slowest */
101
102#define UNRAVEL
103/* #define UNROLL_LOOPS */
104
105/* The SHA f()-functions. The f1 and f3 functions can be optimized to
106 save one boolean operation each - thanks to Rich Schroeppel,
107 rcs@cs.arizona.edu for discovering this */
108
109/*#define f1(x,y,z) ((x & y) | (~x & z)) // Rounds 0-19 */
110#define f1(x,y,z) (z ^ (x & (y ^ z))) /* Rounds 0-19 */
111#define f2(x,y,z) (x ^ y ^ z) /* Rounds 20-39 */
112/*#define f3(x,y,z) ((x & y) | (x & z) | (y & z)) // Rounds 40-59 */
113#define f3(x,y,z) ((x & y) | (z & (x | y))) /* Rounds 40-59 */
114#define f4(x,y,z) (x ^ y ^ z) /* Rounds 60-79 */
115
116/* SHA constants */
117
118#define CONST1 0x5a827999L /* Rounds 0-19 */
119#define CONST2 0x6ed9eba1L /* Rounds 20-39 */
120#define CONST3 0x8f1bbcdcL /* Rounds 40-59 */
121#define CONST4 0xca62c1d6L /* Rounds 60-79 */
122
123/* 32-bit rotate */
124
125#define R32(x,n) ((x << n) | (x >> (32 - n)))
126
127/* the generic case, for when the overall rotation is not unraveled */
128
129#define FG(n) \
130 T = R32(A,5) + f##n(B,C,D) + E + *WP++ + CONST##n; \
131 E = D; D = C; C = R32(B,30); B = A; A = T
132
133/* specific cases, for when the overall rotation is unraveled */
134
135#define FA(n) \
136 T = R32(A,5) + f##n(B,C,D) + E + *WP++ + CONST##n; B = R32(B,30)
137
138#define FB(n) \
139 E = R32(T,5) + f##n(A,B,C) + D + *WP++ + CONST##n; A = R32(A,30)
140
141#define FC(n) \
142 D = R32(E,5) + f##n(T,A,B) + C + *WP++ + CONST##n; T = R32(T,30)
143
144#define FD(n) \
145 C = R32(D,5) + f##n(E,T,A) + B + *WP++ + CONST##n; E = R32(E,30)
146
147#define FE(n) \
148 B = R32(C,5) + f##n(D,E,T) + A + *WP++ + CONST##n; D = R32(D,30)
149
150#define FT(n) \
151 A = R32(B,5) + f##n(C,D,E) + T + *WP++ + CONST##n; C = R32(C,30)
152
153/* do SHA transformation */
154
155static void
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000156sha_transform(SHAobject *sha_info)
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000157{
158 int i;
159 SHA_INT32 T, A, B, C, D, E, W[80], *WP;
160
161 memcpy(W, sha_info->data, sizeof(sha_info->data));
Guido van Rossumff1ccbf1999-04-10 15:48:23 +0000162 longReverse(W, (int)sizeof(sha_info->data), sha_info->Endianness);
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000163
164 for (i = 16; i < 80; ++i) {
165 W[i] = W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16];
166
167 /* extra rotation fix */
168 W[i] = R32(W[i], 1);
169 }
170 A = sha_info->digest[0];
171 B = sha_info->digest[1];
172 C = sha_info->digest[2];
173 D = sha_info->digest[3];
174 E = sha_info->digest[4];
175 WP = W;
176#ifdef UNRAVEL
177 FA(1); FB(1); FC(1); FD(1); FE(1); FT(1); FA(1); FB(1); FC(1); FD(1);
178 FE(1); FT(1); FA(1); FB(1); FC(1); FD(1); FE(1); FT(1); FA(1); FB(1);
179 FC(2); FD(2); FE(2); FT(2); FA(2); FB(2); FC(2); FD(2); FE(2); FT(2);
180 FA(2); FB(2); FC(2); FD(2); FE(2); FT(2); FA(2); FB(2); FC(2); FD(2);
181 FE(3); FT(3); FA(3); FB(3); FC(3); FD(3); FE(3); FT(3); FA(3); FB(3);
182 FC(3); FD(3); FE(3); FT(3); FA(3); FB(3); FC(3); FD(3); FE(3); FT(3);
183 FA(4); FB(4); FC(4); FD(4); FE(4); FT(4); FA(4); FB(4); FC(4); FD(4);
184 FE(4); FT(4); FA(4); FB(4); FC(4); FD(4); FE(4); FT(4); FA(4); FB(4);
185 sha_info->digest[0] += E;
186 sha_info->digest[1] += T;
187 sha_info->digest[2] += A;
188 sha_info->digest[3] += B;
189 sha_info->digest[4] += C;
190#else /* !UNRAVEL */
191#ifdef UNROLL_LOOPS
192 FG(1); FG(1); FG(1); FG(1); FG(1); FG(1); FG(1); FG(1); FG(1); FG(1);
193 FG(1); FG(1); FG(1); FG(1); FG(1); FG(1); FG(1); FG(1); FG(1); FG(1);
194 FG(2); FG(2); FG(2); FG(2); FG(2); FG(2); FG(2); FG(2); FG(2); FG(2);
195 FG(2); FG(2); FG(2); FG(2); FG(2); FG(2); FG(2); FG(2); FG(2); FG(2);
196 FG(3); FG(3); FG(3); FG(3); FG(3); FG(3); FG(3); FG(3); FG(3); FG(3);
197 FG(3); FG(3); FG(3); FG(3); FG(3); FG(3); FG(3); FG(3); FG(3); FG(3);
198 FG(4); FG(4); FG(4); FG(4); FG(4); FG(4); FG(4); FG(4); FG(4); FG(4);
199 FG(4); FG(4); FG(4); FG(4); FG(4); FG(4); FG(4); FG(4); FG(4); FG(4);
200#else /* !UNROLL_LOOPS */
201 for (i = 0; i < 20; ++i) { FG(1); }
202 for (i = 20; i < 40; ++i) { FG(2); }
203 for (i = 40; i < 60; ++i) { FG(3); }
204 for (i = 60; i < 80; ++i) { FG(4); }
205#endif /* !UNROLL_LOOPS */
206 sha_info->digest[0] += A;
207 sha_info->digest[1] += B;
208 sha_info->digest[2] += C;
209 sha_info->digest[3] += D;
210 sha_info->digest[4] += E;
211#endif /* !UNRAVEL */
212}
213
214/* initialize the SHA digest */
215
216static void
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000217sha_init(SHAobject *sha_info)
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000218{
219 TestEndianness(sha_info->Endianness)
220
221 sha_info->digest[0] = 0x67452301L;
222 sha_info->digest[1] = 0xefcdab89L;
223 sha_info->digest[2] = 0x98badcfeL;
224 sha_info->digest[3] = 0x10325476L;
225 sha_info->digest[4] = 0xc3d2e1f0L;
226 sha_info->count_lo = 0L;
227 sha_info->count_hi = 0L;
228 sha_info->local = 0;
229}
230
231/* update the SHA digest */
232
233static void
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000234sha_update(SHAobject *sha_info, SHA_BYTE *buffer, int count)
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000235{
236 int i;
237 SHA_INT32 clo;
238
239 clo = sha_info->count_lo + ((SHA_INT32) count << 3);
240 if (clo < sha_info->count_lo) {
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000241 ++sha_info->count_hi;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000242 }
243 sha_info->count_lo = clo;
244 sha_info->count_hi += (SHA_INT32) count >> 29;
245 if (sha_info->local) {
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000246 i = SHA_BLOCKSIZE - sha_info->local;
247 if (i > count) {
248 i = count;
249 }
250 memcpy(((SHA_BYTE *) sha_info->data) + sha_info->local, buffer, i);
251 count -= i;
252 buffer += i;
253 sha_info->local += i;
254 if (sha_info->local == SHA_BLOCKSIZE) {
255 sha_transform(sha_info);
256 }
257 else {
258 return;
259 }
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000260 }
261 while (count >= SHA_BLOCKSIZE) {
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000262 memcpy(sha_info->data, buffer, SHA_BLOCKSIZE);
263 buffer += SHA_BLOCKSIZE;
264 count -= SHA_BLOCKSIZE;
265 sha_transform(sha_info);
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000266 }
267 memcpy(sha_info->data, buffer, count);
268 sha_info->local = count;
269}
270
271/* finish computing the SHA digest */
272
273static void
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000274sha_final(unsigned char digest[20], SHAobject *sha_info)
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000275{
276 int count;
277 SHA_INT32 lo_bit_count, hi_bit_count;
278
279 lo_bit_count = sha_info->count_lo;
280 hi_bit_count = sha_info->count_hi;
281 count = (int) ((lo_bit_count >> 3) & 0x3f);
282 ((SHA_BYTE *) sha_info->data)[count++] = 0x80;
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000283 if (count > SHA_BLOCKSIZE - 8) {
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000284 memset(((SHA_BYTE *) sha_info->data) + count, 0,
285 SHA_BLOCKSIZE - count);
286 sha_transform(sha_info);
287 memset((SHA_BYTE *) sha_info->data, 0, SHA_BLOCKSIZE - 8);
288 }
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000289 else {
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000290 memset(((SHA_BYTE *) sha_info->data) + count, 0,
291 SHA_BLOCKSIZE - 8 - count);
292 }
293
294 /* GJS: note that we add the hi/lo in big-endian. sha_transform will
295 swap these values into host-order. */
296 sha_info->data[56] = (hi_bit_count >> 24) & 0xff;
297 sha_info->data[57] = (hi_bit_count >> 16) & 0xff;
298 sha_info->data[58] = (hi_bit_count >> 8) & 0xff;
299 sha_info->data[59] = (hi_bit_count >> 0) & 0xff;
300 sha_info->data[60] = (lo_bit_count >> 24) & 0xff;
301 sha_info->data[61] = (lo_bit_count >> 16) & 0xff;
302 sha_info->data[62] = (lo_bit_count >> 8) & 0xff;
303 sha_info->data[63] = (lo_bit_count >> 0) & 0xff;
304 sha_transform(sha_info);
305 digest[ 0] = (unsigned char) ((sha_info->digest[0] >> 24) & 0xff);
306 digest[ 1] = (unsigned char) ((sha_info->digest[0] >> 16) & 0xff);
307 digest[ 2] = (unsigned char) ((sha_info->digest[0] >> 8) & 0xff);
308 digest[ 3] = (unsigned char) ((sha_info->digest[0] ) & 0xff);
309 digest[ 4] = (unsigned char) ((sha_info->digest[1] >> 24) & 0xff);
310 digest[ 5] = (unsigned char) ((sha_info->digest[1] >> 16) & 0xff);
311 digest[ 6] = (unsigned char) ((sha_info->digest[1] >> 8) & 0xff);
312 digest[ 7] = (unsigned char) ((sha_info->digest[1] ) & 0xff);
313 digest[ 8] = (unsigned char) ((sha_info->digest[2] >> 24) & 0xff);
314 digest[ 9] = (unsigned char) ((sha_info->digest[2] >> 16) & 0xff);
315 digest[10] = (unsigned char) ((sha_info->digest[2] >> 8) & 0xff);
316 digest[11] = (unsigned char) ((sha_info->digest[2] ) & 0xff);
317 digest[12] = (unsigned char) ((sha_info->digest[3] >> 24) & 0xff);
318 digest[13] = (unsigned char) ((sha_info->digest[3] >> 16) & 0xff);
319 digest[14] = (unsigned char) ((sha_info->digest[3] >> 8) & 0xff);
320 digest[15] = (unsigned char) ((sha_info->digest[3] ) & 0xff);
321 digest[16] = (unsigned char) ((sha_info->digest[4] >> 24) & 0xff);
322 digest[17] = (unsigned char) ((sha_info->digest[4] >> 16) & 0xff);
323 digest[18] = (unsigned char) ((sha_info->digest[4] >> 8) & 0xff);
324 digest[19] = (unsigned char) ((sha_info->digest[4] ) & 0xff);
325}
326
327/*
328 * End of copied SHA code.
329 *
330 * ------------------------------------------------------------------------
331 */
332
333staticforward PyTypeObject SHAtype;
334
335
336static SHAobject *
Thomas Woutersf3f33dc2000-07-21 06:00:07 +0000337newSHAobject(void)
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000338{
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000339 return (SHAobject *)PyObject_New(SHAobject, &SHAtype);
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000340}
341
342/* Internal methods for a hashing object */
343
344static void
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000345SHA_dealloc(PyObject *ptr)
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000346{
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000347 PyObject_Del(ptr);
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000348}
349
350
351/* External methods for a hashing object */
352
353static char SHA_copy__doc__[] =
354"Return a copy of the hashing object.";
355
356static PyObject *
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000357SHA_copy(SHAobject *self, PyObject *args)
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000358{
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000359 SHAobject *newobj;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000360
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000361 if (!PyArg_ParseTuple(args, ":copy")) {
362 return NULL;
363 }
364 if ( (newobj = newSHAobject())==NULL)
365 return NULL;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000366
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000367 SHAcopy(self, newobj);
368 return (PyObject *)newobj;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000369}
370
371static char SHA_digest__doc__[] =
372"Return the digest value as a string of binary data.";
373
374static PyObject *
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000375SHA_digest(SHAobject *self, PyObject *args)
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000376{
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000377 unsigned char digest[SHA_DIGESTSIZE];
378 SHAobject temp;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000379
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000380 if (!PyArg_ParseTuple(args, ":digest"))
381 return NULL;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000382
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000383 SHAcopy(self, &temp);
384 sha_final(digest, &temp);
385 return PyString_FromStringAndSize((const char *)digest, sizeof(digest));
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000386}
387
388static char SHA_hexdigest__doc__[] =
389"Return the digest value as a string of hexadecimal digits.";
390
391static PyObject *
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000392SHA_hexdigest(SHAobject *self, PyObject *args)
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000393{
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000394 unsigned char digest[SHA_DIGESTSIZE];
395 SHAobject temp;
396 PyObject *retval;
397 char *hex_digest;
398 int i, j;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000399
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000400 if (!PyArg_ParseTuple(args, ":hexdigest"))
401 return NULL;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000402
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000403 /* Get the raw (binary) digest value */
404 SHAcopy(self, &temp);
405 sha_final(digest, &temp);
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000406
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000407 /* Create a new string */
408 retval = PyString_FromStringAndSize(NULL, sizeof(digest) * 2);
Barry Warsaw57b808d2000-08-15 06:03:35 +0000409 if (!retval)
410 return NULL;
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000411 hex_digest = PyString_AsString(retval);
Barry Warsaw57b808d2000-08-15 06:03:35 +0000412 if (!hex_digest) {
413 Py_DECREF(retval);
414 return NULL;
415 }
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000416
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000417 /* Make hex version of the digest */
418 for(i=j=0; i<sizeof(digest); i++) {
419 char c;
Barry Warsaw57b808d2000-08-15 06:03:35 +0000420 c = (digest[i] >> 4) & 0xf;
421 c = (c>9) ? c+'a'-10 : c + '0';
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000422 hex_digest[j++] = c;
Barry Warsaw57b808d2000-08-15 06:03:35 +0000423 c = (digest[i] & 0xf);
424 c = (c>9) ? c+'a'-10 : c + '0';
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000425 hex_digest[j++] = c;
426 }
427 return retval;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000428}
429
430static char SHA_update__doc__[] =
431"Update this hashing object's state with the provided string.";
432
433static PyObject *
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000434SHA_update(SHAobject *self, PyObject *args)
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000435{
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000436 unsigned char *cp;
437 int len;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000438
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000439 if (!PyArg_ParseTuple(args, "s#:update", &cp, &len))
440 return NULL;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000441
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000442 sha_update(self, cp, len);
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000443
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000444 Py_INCREF(Py_None);
445 return Py_None;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000446}
447
448static PyMethodDef SHA_methods[] = {
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000449 {"copy", (PyCFunction)SHA_copy, METH_VARARGS, SHA_copy__doc__},
450 {"digest", (PyCFunction)SHA_digest, METH_VARARGS, SHA_digest__doc__},
451 {"hexdigest", (PyCFunction)SHA_hexdigest, METH_VARARGS, SHA_hexdigest__doc__},
452 {"update", (PyCFunction)SHA_update, METH_VARARGS, SHA_update__doc__},
453 {NULL, NULL} /* sentinel */
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000454};
455
456static PyObject *
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000457SHA_getattr(PyObject *self, char *name)
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000458{
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000459 if (strcmp(name, "blocksize")==0)
460 return PyInt_FromLong(1);
461 if (strcmp(name, "digestsize")==0)
462 return PyInt_FromLong(20);
463
464 return Py_FindMethod(SHA_methods, self, name);
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000465}
466
467static PyTypeObject SHAtype = {
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000468 PyObject_HEAD_INIT(NULL)
469 0, /*ob_size*/
470 "SHA", /*tp_name*/
471 sizeof(SHAobject), /*tp_size*/
472 0, /*tp_itemsize*/
473 /* methods */
474 SHA_dealloc, /*tp_dealloc*/
475 0, /*tp_print*/
476 SHA_getattr, /*tp_getattr*/
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000477};
478
479
480/* The single module-level function: new() */
481
482static char SHA_new__doc__[] =
483 "Return a new SHA hashing object. An optional string "
484 "argument may be provided; if present, this string will be "
485 " automatically hashed.";
486
487static PyObject *
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000488SHA_new(PyObject *self, PyObject *args, PyObject *kwdict)
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000489{
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000490 static char *kwlist[] = {"string", NULL};
491 SHAobject *new;
492 unsigned char *cp = NULL;
493 int len;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000494
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000495 if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|s#:new", kwlist,
496 &cp, &len)) {
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000497 return NULL;
498 }
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000499
Jeremy Hylton55087f02001-01-29 22:46:35 +0000500 if ((new = newSHAobject()) == NULL)
501 return NULL;
502
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000503 sha_init(new);
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000504
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000505 if (PyErr_Occurred()) {
506 Py_DECREF(new);
507 return NULL;
508 }
509 if (cp)
510 sha_update(new, cp, len);
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000511
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000512 return (PyObject *)new;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000513}
514
515
516/* List of functions exported by this module */
517
518static struct PyMethodDef SHA_functions[] = {
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000519 {"new", (PyCFunction)SHA_new, METH_VARARGS|METH_KEYWORDS, SHA_new__doc__},
520 {"sha", (PyCFunction)SHA_new, METH_VARARGS|METH_KEYWORDS, SHA_new__doc__},
521 {NULL, NULL} /* Sentinel */
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000522};
523
524
525/* Initialize this module. */
526
527#define insint(n,v) { PyObject *o=PyInt_FromLong(v); \
528 if (o!=NULL) PyDict_SetItemString(d,n,o); \
529 Py_XDECREF(o); }
530
Guido van Rossum5a530192001-01-10 21:03:32 +0000531DL_EXPORT(void)
Thomas Woutersf3f33dc2000-07-21 06:00:07 +0000532initsha(void)
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000533{
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000534 PyObject *d, *m;
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000535
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000536 SHAtype.ob_type = &PyType_Type;
537 m = Py_InitModule("sha", SHA_functions);
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000538
Fred Drake2c4a3dc2000-07-08 06:41:03 +0000539 /* Add some symbolic constants to the module */
540 d = PyModule_GetDict(m);
541 insint("blocksize", 1); /* For future use, in case some hash
542 functions require an integral number of
543 blocks */
544 insint("digestsize", 20);
Guido van Rossum29d2acc1999-03-24 19:03:59 +0000545}