Source

cpython-withatomic / Modules / sha1module.c

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
/* SHA1 module */

/* This module provides an interface to the SHA1 algorithm */

/* See below for information about the original code this module was
   based upon. Additional work performed by:

   Andrew Kuchling (amk@amk.ca)
   Greg Stein (gstein@lyra.org)
   Trevor Perrin (trevp@trevp.net)

   Copyright (C) 2005-2007   Gregory P. Smith (greg@krypto.org)
   Licensed to PSF under a Contributor Agreement.

*/

/* SHA1 objects */

#include "Python.h"
#include "hashlib.h"


/* Some useful types */

#if SIZEOF_INT == 4
typedef unsigned int SHA1_INT32;        /* 32-bit integer */
typedef PY_LONG_LONG SHA1_INT64;        /* 64-bit integer */
#else
/* not defined. compilation will die. */
#endif

/* The SHA1 block size and message digest sizes, in bytes */

#define SHA1_BLOCKSIZE    64
#define SHA1_DIGESTSIZE   20

/* The structure for storing SHA1 info */

struct sha1_state {
    SHA1_INT64 length;
    SHA1_INT32 state[5], curlen;
    unsigned char buf[SHA1_BLOCKSIZE];
};

typedef struct {
    PyObject_HEAD

    struct sha1_state hash_state;
} SHA1object;


/* ------------------------------------------------------------------------
 *
 * This code for the SHA1 algorithm was noted as public domain. The
 * original headers are pasted below.
 *
 * Several changes have been made to make it more compatible with the
 * Python environment and desired interface.
 *
 */

/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 *
 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
 */

/* rotate the hard way (platform optimizations could be done) */
#define ROL(x, y) ( (((unsigned long)(x)<<(unsigned long)((y)&31)) | (((unsigned long)(x)&0xFFFFFFFFUL)>>(unsigned long)(32-((y)&31)))) & 0xFFFFFFFFUL)
#define ROLc(x, y) ( (((unsigned long)(x)<<(unsigned long)((y)&31)) | (((unsigned long)(x)&0xFFFFFFFFUL)>>(unsigned long)(32-((y)&31)))) & 0xFFFFFFFFUL)

/* Endian Neutral macros that work on all platforms */

#define STORE32H(x, y)                                                                     \
     { (y)[0] = (unsigned char)(((x)>>24)&255); (y)[1] = (unsigned char)(((x)>>16)&255);   \
       (y)[2] = (unsigned char)(((x)>>8)&255); (y)[3] = (unsigned char)((x)&255); }

#define LOAD32H(x, y)                            \
     { x = ((unsigned long)((y)[0] & 255)<<24) | \
           ((unsigned long)((y)[1] & 255)<<16) | \
           ((unsigned long)((y)[2] & 255)<<8)  | \
           ((unsigned long)((y)[3] & 255)); }

#define STORE64H(x, y)                                                                     \
   { (y)[0] = (unsigned char)(((x)>>56)&255); (y)[1] = (unsigned char)(((x)>>48)&255);     \
     (y)[2] = (unsigned char)(((x)>>40)&255); (y)[3] = (unsigned char)(((x)>>32)&255);     \
     (y)[4] = (unsigned char)(((x)>>24)&255); (y)[5] = (unsigned char)(((x)>>16)&255);     \
     (y)[6] = (unsigned char)(((x)>>8)&255); (y)[7] = (unsigned char)((x)&255); }

#ifndef MIN
   #define MIN(x, y) ( ((x)<(y))?(x):(y) )
#endif


/* SHA1 macros */

#define F0(x,y,z)  (z ^ (x & (y ^ z)))
#define F1(x,y,z)  (x ^ y ^ z)
#define F2(x,y,z)  ((x & y) | (z & (x | y)))
#define F3(x,y,z)  (x ^ y ^ z)

static void sha1_compress(struct sha1_state *sha1, unsigned char *buf)
{
    SHA1_INT32 a,b,c,d,e,W[80],i;

    /* copy the state into 512-bits into W[0..15] */
    for (i = 0; i < 16; i++) {
        LOAD32H(W[i], buf + (4*i));
    }

    /* copy state */
    a = sha1->state[0];
    b = sha1->state[1];
    c = sha1->state[2];
    d = sha1->state[3];
    e = sha1->state[4];

    /* expand it */
    for (i = 16; i < 80; i++) {
        W[i] = ROL(W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16], 1);
    }

    /* compress */
    /* round one */
    #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);
    #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);
    #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);
    #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);

    for (i = 0; i < 20; ) {
       FF_0(a,b,c,d,e,i++);
       FF_0(e,a,b,c,d,i++);
       FF_0(d,e,a,b,c,i++);
       FF_0(c,d,e,a,b,i++);
       FF_0(b,c,d,e,a,i++);
    }

    /* round two */
    for (; i < 40; )  {
       FF_1(a,b,c,d,e,i++);
       FF_1(e,a,b,c,d,i++);
       FF_1(d,e,a,b,c,i++);
       FF_1(c,d,e,a,b,i++);
       FF_1(b,c,d,e,a,i++);
    }

    /* round three */
    for (; i < 60; )  {
       FF_2(a,b,c,d,e,i++);
       FF_2(e,a,b,c,d,i++);
       FF_2(d,e,a,b,c,i++);
       FF_2(c,d,e,a,b,i++);
       FF_2(b,c,d,e,a,i++);
    }

    /* round four */
    for (; i < 80; )  {
       FF_3(a,b,c,d,e,i++);
       FF_3(e,a,b,c,d,i++);
       FF_3(d,e,a,b,c,i++);
       FF_3(c,d,e,a,b,i++);
       FF_3(b,c,d,e,a,i++);
    }

    #undef FF_0
    #undef FF_1
    #undef FF_2
    #undef FF_3

    /* store */
    sha1->state[0] = sha1->state[0] + a;
    sha1->state[1] = sha1->state[1] + b;
    sha1->state[2] = sha1->state[2] + c;
    sha1->state[3] = sha1->state[3] + d;
    sha1->state[4] = sha1->state[4] + e;
}

/**
   Initialize the hash state
   @param sha1   The hash state you wish to initialize
*/
void sha1_init(struct sha1_state *sha1)
{
   assert(sha1 != NULL);
   sha1->state[0] = 0x67452301UL;
   sha1->state[1] = 0xefcdab89UL;
   sha1->state[2] = 0x98badcfeUL;
   sha1->state[3] = 0x10325476UL;
   sha1->state[4] = 0xc3d2e1f0UL;
   sha1->curlen = 0;
   sha1->length = 0;
}

/**
   Process a block of memory though the hash
   @param sha1   The hash state
   @param in     The data to hash
   @param inlen  The length of the data (octets)
*/
void sha1_process(struct sha1_state *sha1,
                  const unsigned char *in, Py_ssize_t inlen)
{
    Py_ssize_t n;

    assert(sha1 != NULL);
    assert(in != NULL);
    assert(sha1->curlen <= sizeof(sha1->buf));

    while (inlen > 0) {
        if (sha1->curlen == 0 && inlen >= SHA1_BLOCKSIZE) {
           sha1_compress(sha1, (unsigned char *)in);
           sha1->length   += SHA1_BLOCKSIZE * 8;
           in             += SHA1_BLOCKSIZE;
           inlen          -= SHA1_BLOCKSIZE;
        } else {
           n = MIN(inlen, (SHA1_BLOCKSIZE - sha1->curlen));
           memcpy(sha1->buf + sha1->curlen, in, (size_t)n);
           sha1->curlen   += n;
           in             += n;
           inlen          -= n;
           if (sha1->curlen == SHA1_BLOCKSIZE) {
              sha1_compress(sha1, sha1->buf);
              sha1->length += 8*SHA1_BLOCKSIZE;
              sha1->curlen = 0;
           }
       }
    }
}

/**
   Terminate the hash to get the digest
   @param sha1  The hash state
   @param out [out] The destination of the hash (20 bytes)
*/
void sha1_done(struct sha1_state *sha1, unsigned char *out)
{
    int i;

    assert(sha1 != NULL);
    assert(out != NULL);
    assert(sha1->curlen < sizeof(sha1->buf));

    /* increase the length of the message */
    sha1->length += sha1->curlen * 8;

    /* append the '1' bit */
    sha1->buf[sha1->curlen++] = (unsigned char)0x80;

    /* if the length is currently above 56 bytes we append zeros
     * then compress.  Then we can fall back to padding zeros and length
     * encoding like normal.
     */
    if (sha1->curlen > 56) {
        while (sha1->curlen < 64) {
            sha1->buf[sha1->curlen++] = (unsigned char)0;
        }
        sha1_compress(sha1, sha1->buf);
        sha1->curlen = 0;
    }

    /* pad upto 56 bytes of zeroes */
    while (sha1->curlen < 56) {
        sha1->buf[sha1->curlen++] = (unsigned char)0;
    }

    /* store length */
    STORE64H(sha1->length, sha1->buf+56);
    sha1_compress(sha1, sha1->buf);

    /* copy output */
    for (i = 0; i < 5; i++) {
        STORE32H(sha1->state[i], out+(4*i));
    }
}


/* .Source: /cvs/libtom/libtomcrypt/src/hashes/sha1.c,v $ */
/* .Revision: 1.10 $ */
/* .Date: 2007/05/12 14:25:28 $ */

/*
 * End of copied SHA1 code.
 *
 * ------------------------------------------------------------------------
 */

static PyTypeObject SHA1type;


static SHA1object *
newSHA1object(void)
{
    return (SHA1object *)PyObject_New(SHA1object, &SHA1type);
}


/* Internal methods for a hash object */

static void
SHA1_dealloc(PyObject *ptr)
{
    PyObject_Del(ptr);
}


/* External methods for a hash object */

PyDoc_STRVAR(SHA1_copy__doc__, "Return a copy of the hash object.");

static PyObject *
SHA1_copy(SHA1object *self, PyObject *unused)
{
    SHA1object *newobj;

    if (Py_TYPE(self) == &SHA1type) {
        if ( (newobj = newSHA1object())==NULL)
            return NULL;
    } else {
        if ( (newobj = newSHA1object())==NULL)
            return NULL;
    }

    newobj->hash_state = self->hash_state;
    return (PyObject *)newobj;
}

PyDoc_STRVAR(SHA1_digest__doc__,
"Return the digest value as a string of binary data.");

static PyObject *
SHA1_digest(SHA1object *self, PyObject *unused)
{
    unsigned char digest[SHA1_DIGESTSIZE];
    struct sha1_state temp;

    temp = self->hash_state;
    sha1_done(&temp, digest);
    return PyBytes_FromStringAndSize((const char *)digest, SHA1_DIGESTSIZE);
}

PyDoc_STRVAR(SHA1_hexdigest__doc__,
"Return the digest value as a string of hexadecimal digits.");

static PyObject *
SHA1_hexdigest(SHA1object *self, PyObject *unused)
{
    unsigned char digest[SHA1_DIGESTSIZE];
    struct sha1_state temp;
    PyObject *retval;
    Py_UNICODE *hex_digest;
    int i, j;

    /* Get the raw (binary) digest value */
    temp = self->hash_state;
    sha1_done(&temp, digest);

    /* Create a new string */
    retval = PyUnicode_FromStringAndSize(NULL, SHA1_DIGESTSIZE * 2);
    if (!retval)
            return NULL;
    hex_digest = PyUnicode_AS_UNICODE(retval);
    if (!hex_digest) {
            Py_DECREF(retval);
            return NULL;
    }

    /* Make hex version of the digest */
    for(i=j=0; i<SHA1_DIGESTSIZE; i++) {
        char c;
        c = (digest[i] >> 4) & 0xf;
        c = (c>9) ? c+'a'-10 : c + '0';
        hex_digest[j++] = c;
        c = (digest[i] & 0xf);
        c = (c>9) ? c+'a'-10 : c + '0';
        hex_digest[j++] = c;
    }
    return retval;
}

PyDoc_STRVAR(SHA1_update__doc__,
"Update this hash object's state with the provided string.");

static PyObject *
SHA1_update(SHA1object *self, PyObject *args)
{
    PyObject *obj;
    Py_buffer buf;

    if (!PyArg_ParseTuple(args, "O:update", &obj))
        return NULL;

    GET_BUFFER_VIEW_OR_ERROUT(obj, &buf);

    sha1_process(&self->hash_state, buf.buf, buf.len);

    PyBuffer_Release(&buf);
    Py_INCREF(Py_None);
    return Py_None;
}

static PyMethodDef SHA1_methods[] = {
    {"copy",      (PyCFunction)SHA1_copy,      METH_NOARGS,  SHA1_copy__doc__},
    {"digest",    (PyCFunction)SHA1_digest,    METH_NOARGS,  SHA1_digest__doc__},
    {"hexdigest", (PyCFunction)SHA1_hexdigest, METH_NOARGS,  SHA1_hexdigest__doc__},
    {"update",    (PyCFunction)SHA1_update,    METH_VARARGS, SHA1_update__doc__},
    {NULL,        NULL}         /* sentinel */
};

static PyObject *
SHA1_get_block_size(PyObject *self, void *closure)
{
    return PyLong_FromLong(SHA1_BLOCKSIZE);
}

static PyObject *
SHA1_get_name(PyObject *self, void *closure)
{
    return PyUnicode_FromStringAndSize("SHA1", 3);
}

static PyObject *
sha1_get_digest_size(PyObject *self, void *closure)
{
    return PyLong_FromLong(SHA1_DIGESTSIZE);
}


static PyGetSetDef SHA1_getseters[] = {
    {"block_size",
     (getter)SHA1_get_block_size, NULL,
     NULL,
     NULL},
    {"name",
     (getter)SHA1_get_name, NULL,
     NULL,
     NULL},
    {"digest_size",
     (getter)sha1_get_digest_size, NULL,
     NULL,
     NULL},
    {NULL}  /* Sentinel */
};

static PyTypeObject SHA1type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "_sha1.sha1",               /*tp_name*/
    sizeof(SHA1object), /*tp_size*/
    0,                  /*tp_itemsize*/
    /* methods */
    SHA1_dealloc,       /*tp_dealloc*/
    0,                  /*tp_print*/
    0,                  /*tp_getattr*/
    0,                  /*tp_setattr*/
    0,                  /*tp_reserved*/
    0,                  /*tp_repr*/
    0,                  /*tp_as_number*/
    0,                  /*tp_as_sequence*/
    0,                  /*tp_as_mapping*/
    0,                  /*tp_hash*/
    0,                  /*tp_call*/
    0,                  /*tp_str*/
    0,                  /*tp_getattro*/
    0,                  /*tp_setattro*/
    0,                  /*tp_as_buffer*/
    Py_TPFLAGS_DEFAULT, /*tp_flags*/
    0,                  /*tp_doc*/
    0,                  /*tp_traverse*/
    0,                  /*tp_clear*/
    0,                  /*tp_richcompare*/
    0,                  /*tp_weaklistoffset*/
    0,                  /*tp_iter*/
    0,                  /*tp_iternext*/
    SHA1_methods,       /* tp_methods */
    NULL,               /* tp_members */
    SHA1_getseters,      /* tp_getset */
};


/* The single module-level function: new() */

PyDoc_STRVAR(SHA1_new__doc__,
"Return a new SHA1 hash object; optionally initialized with a string.");

static PyObject *
SHA1_new(PyObject *self, PyObject *args, PyObject *kwdict)
{
    static char *kwlist[] = {"string", NULL};
    SHA1object *new;
    PyObject *data_obj = NULL;
    Py_buffer buf;

    if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|O:new", kwlist,
                                     &data_obj)) {
        return NULL;
    }

    if (data_obj)
        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);
}
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.