1 | // Copyright (c) Microsoft. All rights reserved.
|
---|
2 | // Licensed under the MIT license. See LICENSE file in the project root for full license information.
|
---|
3 |
|
---|
4 | /*************************** sha224-256.c ***************************/
|
---|
5 | /********************* See RFC 4634 for details *********************/
|
---|
6 | /*
|
---|
7 | * Description:
|
---|
8 | * This file implements the Secure Hash Signature Standard
|
---|
9 | * algorithms as defined in the National Institute of Standards
|
---|
10 | * and Technology Federal Information Processing Standards
|
---|
11 | * Publication (FIPS PUB) 180-1 published on April 17, 1995, 180-2
|
---|
12 | * published on August 1, 2002, and the FIPS PUB 180-2 Change
|
---|
13 | * Notice published on February 28, 2004.
|
---|
14 | *
|
---|
15 | * A combined document showing all algorithms is available at
|
---|
16 | * http://csrc.nist.gov/publications/fips/
|
---|
17 | * fips180-2/fips180-2withchangenotice.pdf
|
---|
18 | *
|
---|
19 | * The SHA-224 and SHA-256 algorithms produce 224-bit and 256-bit
|
---|
20 | * message digests for a given data stream. It should take about
|
---|
21 | * 2**n steps to find a message with the same digest as a given
|
---|
22 | * message and 2**(n/2) to find any two messages with the same
|
---|
23 | * digest, when n is the digest size in bits. Therefore, this
|
---|
24 | * algorithm can serve as a means of providing a
|
---|
25 | * "fingerprint" for a message.
|
---|
26 | *
|
---|
27 | * Portability Issues:
|
---|
28 | * SHA-224 and SHA-256 are defined in terms of 32-bit "words".
|
---|
29 | * This code uses <stdint.h> (included via "sha.h") to define 32
|
---|
30 | * and 8 bit unsigned integer types. If your C compiler does not
|
---|
31 | * support 32 bit unsigned integers, this code is not
|
---|
32 | * appropriate.
|
---|
33 | *
|
---|
34 | * Caveats:
|
---|
35 | * SHA-224 and SHA-256 are designed to work with messages less
|
---|
36 | * than 2^64 bits long. This implementation uses SHA224/256Input()
|
---|
37 | * to hash the bits that are a multiple of the size of an 8-bit
|
---|
38 | * character, and then uses SHA224/256FinalBits() to hash the
|
---|
39 | * final few bits of the input.
|
---|
40 | */
|
---|
41 |
|
---|
42 | #include <stdlib.h>
|
---|
43 | #include <stdint.h>
|
---|
44 |
|
---|
45 | #include "azure_c_shared_utility/sha.h"
|
---|
46 | #include "azure_c_shared_utility/sha-private.h"
|
---|
47 | /* Define the SHA shift, rotate left and rotate right macro */
|
---|
48 | #define SHA256_SHR(bits,word) ((word) >> (bits))
|
---|
49 | #define SHA256_ROTL(bits,word) \
|
---|
50 | (((word) << (bits)) | ((word) >> (32-(bits))))
|
---|
51 | #define SHA256_ROTR(bits,word) \
|
---|
52 | (((word) >> (bits)) | ((word) << (32-(bits))))
|
---|
53 |
|
---|
54 | /* Define the SHA SIGMA and sigma macros */
|
---|
55 | #define SHA256_SIGMA0(word) \
|
---|
56 | (SHA256_ROTR( 2,word) ^ SHA256_ROTR(13,word) ^ SHA256_ROTR(22,word))
|
---|
57 | #define SHA256_SIGMA1(word) \
|
---|
58 | (SHA256_ROTR( 6,word) ^ SHA256_ROTR(11,word) ^ SHA256_ROTR(25,word))
|
---|
59 | #define SHA256_sigma0(word) \
|
---|
60 | (SHA256_ROTR( 7,word) ^ SHA256_ROTR(18,word) ^ SHA256_SHR( 3,word))
|
---|
61 | #define SHA256_sigma1(word) \
|
---|
62 | (SHA256_ROTR(17,word) ^ SHA256_ROTR(19,word) ^ SHA256_SHR(10,word))
|
---|
63 |
|
---|
64 | /*
|
---|
65 | * add "length" to the length
|
---|
66 | */
|
---|
67 | #define SHA224_256AddLength(context, length) \
|
---|
68 | (addTemp = (context)->Length_Low, (context)->Corrupted = \
|
---|
69 | (((context)->Length_Low += (length)) < addTemp) && \
|
---|
70 | (++(context)->Length_High == 0) ? 1 : 0)
|
---|
71 |
|
---|
72 | /* Local Function Prototypes */
|
---|
73 | static void SHA224_256Finalize(SHA256Context *context, uint8_t Pad_Byte);
|
---|
74 | static void SHA224_256PadMessage(SHA256Context *context, uint8_t Pad_Byte);
|
---|
75 | static void SHA224_256ProcessMessageBlock(SHA256Context *context);
|
---|
76 | static int SHA224_256Reset(SHA256Context *context, uint32_t *H0);
|
---|
77 | static int SHA224_256ResultN(SHA256Context *context, uint8_t Message_Digest[], int HashSize);
|
---|
78 |
|
---|
79 | /* Initial Hash Values: FIPS-180-2 Change Notice 1 */
|
---|
80 | static uint32_t SHA224_H0[SHA256HashSize / 4] = {
|
---|
81 | 0xC1059ED8, 0x367CD507, 0x3070DD17, 0xF70E5939,
|
---|
82 | 0xFFC00B31, 0x68581511, 0x64F98FA7, 0xBEFA4FA4
|
---|
83 | };
|
---|
84 |
|
---|
85 | /* Initial Hash Values: FIPS-180-2 section 5.3.2 */
|
---|
86 | static uint32_t SHA256_H0[SHA256HashSize / 4] = {
|
---|
87 | 0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
|
---|
88 | 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19
|
---|
89 | };
|
---|
90 |
|
---|
91 | /*
|
---|
92 | * SHA224Reset
|
---|
93 | *
|
---|
94 | * Description:
|
---|
95 | * This function will initialize the SHA384Context in preparation
|
---|
96 | * for computing a new SHA224 message digest.
|
---|
97 | *
|
---|
98 | * Parameters:
|
---|
99 | * context: [in/out]
|
---|
100 | * The context to reset.
|
---|
101 | *
|
---|
102 | * Returns:
|
---|
103 | * sha Error Code.
|
---|
104 | */
|
---|
105 | int SHA224Reset(SHA224Context *context)
|
---|
106 | {
|
---|
107 | return SHA224_256Reset(context, SHA224_H0);
|
---|
108 | }
|
---|
109 |
|
---|
110 | /*
|
---|
111 | * SHA224Input
|
---|
112 | *
|
---|
113 | * Description:
|
---|
114 | * This function accepts an array of octets as the next portion
|
---|
115 | * of the message.
|
---|
116 | *
|
---|
117 | * Parameters:
|
---|
118 | * context: [in/out]
|
---|
119 | * The SHA context to update
|
---|
120 | * message_array: [in]
|
---|
121 | * An array of characters representing the next portion of
|
---|
122 | * the message.
|
---|
123 | * length: [in]
|
---|
124 | * The length of the message in message_array
|
---|
125 | *
|
---|
126 | * Returns:
|
---|
127 | * sha Error Code.
|
---|
128 | *
|
---|
129 | */
|
---|
130 | int SHA224Input(SHA224Context *context, const uint8_t *message_array, unsigned int length)
|
---|
131 | {
|
---|
132 | return SHA256Input(context, message_array, length);
|
---|
133 | }
|
---|
134 |
|
---|
135 | /*
|
---|
136 | * SHA224FinalBits
|
---|
137 | *
|
---|
138 | * Description:
|
---|
139 | * This function will add in any final bits of the message.
|
---|
140 | *
|
---|
141 | * Parameters:
|
---|
142 | * context: [in/out]
|
---|
143 | * The SHA context to update
|
---|
144 | * message_bits: [in]
|
---|
145 | * The final bits of the message, in the upper portion of the
|
---|
146 | * byte. (Use 0b###00000 instead of 0b00000### to input the
|
---|
147 | * three bits ###.)
|
---|
148 | * length: [in]
|
---|
149 | * The number of bits in message_bits, between 1 and 7.
|
---|
150 | *
|
---|
151 | * Returns:
|
---|
152 | * sha Error Code.
|
---|
153 | */
|
---|
154 | int SHA224FinalBits(SHA224Context *context, const uint8_t message_bits, unsigned int length)
|
---|
155 | {
|
---|
156 | return SHA256FinalBits(context, message_bits, length);
|
---|
157 | }
|
---|
158 |
|
---|
159 | /*
|
---|
160 | * SHA224Result
|
---|
161 | *
|
---|
162 | * Description:
|
---|
163 | * This function will return the 224-bit message
|
---|
164 | * digest into the Message_Digest array provided by the caller.
|
---|
165 | * NOTE: The first octet of hash is stored in the 0th element,
|
---|
166 | * the last octet of hash in the 28th element.
|
---|
167 | *
|
---|
168 | * Parameters:
|
---|
169 | * context: [in/out]
|
---|
170 | * The context to use to calculate the SHA hash.
|
---|
171 | * Message_Digest: [out]
|
---|
172 | * Where the digest is returned.
|
---|
173 | *
|
---|
174 | * Returns:
|
---|
175 | * sha Error Code.
|
---|
176 | */
|
---|
177 | int SHA224Result(SHA224Context *context, uint8_t Message_Digest[SHA224HashSize])
|
---|
178 | {
|
---|
179 | return SHA224_256ResultN(context, Message_Digest, SHA224HashSize);
|
---|
180 | }
|
---|
181 |
|
---|
182 | /*
|
---|
183 | * SHA256Reset
|
---|
184 | *
|
---|
185 | * Description:
|
---|
186 | * This function will initialize the SHA256Context in preparation
|
---|
187 | * for computing a new SHA256 message digest.
|
---|
188 | *
|
---|
189 | * Parameters:
|
---|
190 | * context: [in/out]
|
---|
191 | * The context to reset.
|
---|
192 | *
|
---|
193 | * Returns:
|
---|
194 | * sha Error Code.
|
---|
195 | */
|
---|
196 | int SHA256Reset(SHA256Context *context)
|
---|
197 | {
|
---|
198 | return SHA224_256Reset(context, SHA256_H0);
|
---|
199 | }
|
---|
200 |
|
---|
201 | /*
|
---|
202 | * SHA256Input
|
---|
203 | *
|
---|
204 | * Description:
|
---|
205 | * This function accepts an array of octets as the next portion
|
---|
206 | * of the message.
|
---|
207 | *
|
---|
208 | * Parameters:
|
---|
209 | * context: [in/out]
|
---|
210 | * The SHA context to update
|
---|
211 | * message_array: [in]
|
---|
212 | * An array of characters representing the next portion of
|
---|
213 | * the message.
|
---|
214 | * length: [in]
|
---|
215 | * The length of the message in message_array
|
---|
216 | *
|
---|
217 | * Returns:
|
---|
218 | * sha Error Code.
|
---|
219 | */
|
---|
220 | int SHA256Input(SHA256Context *context, const uint8_t *message_array, unsigned int length)
|
---|
221 | {
|
---|
222 | int result;
|
---|
223 | uint32_t addTemp;
|
---|
224 | if (!length)
|
---|
225 | {
|
---|
226 | result = shaSuccess;
|
---|
227 | }
|
---|
228 | else if (!context || !message_array)
|
---|
229 | {
|
---|
230 | result = shaNull;
|
---|
231 | }
|
---|
232 | else if (context->Computed)
|
---|
233 | {
|
---|
234 | result = context->Corrupted = shaStateError;
|
---|
235 | }
|
---|
236 | else if (context->Corrupted)
|
---|
237 | {
|
---|
238 | result = context->Corrupted;
|
---|
239 | }
|
---|
240 | else
|
---|
241 | {
|
---|
242 | while (length-- && !context->Corrupted)
|
---|
243 | {
|
---|
244 | context->Message_Block[context->Message_Block_Index++] = (*message_array & 0xFF);
|
---|
245 |
|
---|
246 | if (!SHA224_256AddLength(context, 8) && (context->Message_Block_Index == SHA256_Message_Block_Size))
|
---|
247 | {
|
---|
248 | SHA224_256ProcessMessageBlock(context);
|
---|
249 | }
|
---|
250 | message_array++;
|
---|
251 | }
|
---|
252 | result = shaSuccess;
|
---|
253 | }
|
---|
254 | return result;
|
---|
255 | }
|
---|
256 |
|
---|
257 | /*
|
---|
258 | * SHA256FinalBits
|
---|
259 | *
|
---|
260 | * Description:
|
---|
261 | * This function will add in any final bits of the message.
|
---|
262 | *
|
---|
263 | * Parameters:
|
---|
264 | * context: [in/out]
|
---|
265 | * The SHA context to update
|
---|
266 | * message_bits: [in]
|
---|
267 | * The final bits of the message, in the upper portion of the
|
---|
268 | * byte. (Use 0b###00000 instead of 0b00000### to input the
|
---|
269 | * three bits ###.)
|
---|
270 | * length: [in]
|
---|
271 | * The number of bits in message_bits, between 1 and 7.
|
---|
272 | *
|
---|
273 | * Returns:
|
---|
274 | * sha Error Code.
|
---|
275 | */
|
---|
276 | int SHA256FinalBits(SHA256Context *context, const uint8_t message_bits, unsigned int length)
|
---|
277 | {
|
---|
278 | int result;
|
---|
279 | uint32_t addTemp;
|
---|
280 | uint8_t masks[8] = {
|
---|
281 | /* 0 0b00000000 */ 0x00, /* 1 0b10000000 */ 0x80,
|
---|
282 | /* 2 0b11000000 */ 0xC0, /* 3 0b11100000 */ 0xE0,
|
---|
283 | /* 4 0b11110000 */ 0xF0, /* 5 0b11111000 */ 0xF8,
|
---|
284 | /* 6 0b11111100 */ 0xFC, /* 7 0b11111110 */ 0xFE
|
---|
285 | };
|
---|
286 |
|
---|
287 | uint8_t markbit[8] = {
|
---|
288 | /* 0 0b10000000 */ 0x80, /* 1 0b01000000 */ 0x40,
|
---|
289 | /* 2 0b00100000 */ 0x20, /* 3 0b00010000 */ 0x10,
|
---|
290 | /* 4 0b00001000 */ 0x08, /* 5 0b00000100 */ 0x04,
|
---|
291 | /* 6 0b00000010 */ 0x02, /* 7 0b00000001 */ 0x01
|
---|
292 | };
|
---|
293 |
|
---|
294 | if (!length)
|
---|
295 | {
|
---|
296 | result = shaSuccess;
|
---|
297 | }
|
---|
298 | else if (!context)
|
---|
299 | {
|
---|
300 | result = shaNull;
|
---|
301 | }
|
---|
302 | else if ((context->Computed) || (length >= 8) || (length == 0))
|
---|
303 | {
|
---|
304 | result = context->Corrupted = shaStateError;
|
---|
305 | }
|
---|
306 | else if (context->Corrupted)
|
---|
307 | {
|
---|
308 | result = context->Corrupted;
|
---|
309 | }
|
---|
310 | else
|
---|
311 | {
|
---|
312 | SHA224_256AddLength(context, length);
|
---|
313 | SHA224_256Finalize(context, (uint8_t)((message_bits & masks[length]) | markbit[length]));
|
---|
314 | result = shaSuccess;
|
---|
315 | }
|
---|
316 | return result;
|
---|
317 | }
|
---|
318 |
|
---|
319 | /*
|
---|
320 | * SHA256Result
|
---|
321 | *
|
---|
322 | * Description:
|
---|
323 | * This function will return the 256-bit message
|
---|
324 | * digest into the Message_Digest array provided by the caller.
|
---|
325 | * NOTE: The first octet of hash is stored in the 0th element,
|
---|
326 | * the last octet of hash in the 32nd element.
|
---|
327 | *
|
---|
328 | * Parameters:
|
---|
329 | * context: [in/out]
|
---|
330 | * The context to use to calculate the SHA hash.
|
---|
331 | * Message_Digest: [out]
|
---|
332 | * Where the digest is returned.
|
---|
333 | *
|
---|
334 | * Returns:
|
---|
335 | * sha Error Code.
|
---|
336 | */
|
---|
337 | int SHA256Result(SHA256Context *context, uint8_t Message_Digest[SHA256HashSize])
|
---|
338 | {
|
---|
339 | return SHA224_256ResultN(context, Message_Digest, SHA256HashSize);
|
---|
340 | }
|
---|
341 |
|
---|
342 | /*
|
---|
343 | * SHA224_256Finalize
|
---|
344 | *
|
---|
345 | * Description:
|
---|
346 | * This helper function finishes off the digest calculations.
|
---|
347 | *
|
---|
348 | * Parameters:
|
---|
349 | * context: [in/out]
|
---|
350 | * The SHA context to update
|
---|
351 | * Pad_Byte: [in]
|
---|
352 | * The last byte to add to the digest before the 0-padding
|
---|
353 | * and length. This will contain the last bits of the message
|
---|
354 | * followed by another single bit. If the message was an
|
---|
355 | * exact multiple of 8-bits long, Pad_Byte will be 0x80.
|
---|
356 | *
|
---|
357 | * Returns:
|
---|
358 | * sha Error Code.
|
---|
359 | */
|
---|
360 | static void SHA224_256Finalize(SHA256Context *context, uint8_t Pad_Byte)
|
---|
361 | {
|
---|
362 | int i;
|
---|
363 | SHA224_256PadMessage(context, Pad_Byte);
|
---|
364 | /* message may be sensitive, so clear it out */
|
---|
365 | for (i = 0; i < SHA256_Message_Block_Size; ++i)
|
---|
366 | {
|
---|
367 | context->Message_Block[i] = 0;
|
---|
368 | }
|
---|
369 | context->Length_Low = 0; /* and clear length */
|
---|
370 | context->Length_High = 0;
|
---|
371 | context->Computed = 1;
|
---|
372 | }
|
---|
373 |
|
---|
374 | /*
|
---|
375 | * SHA224_256PadMessage
|
---|
376 | *
|
---|
377 | * Description:
|
---|
378 | * According to the standard, the message must be padded to an
|
---|
379 | * even 512 bits. The first padding bit must be a '1'. The
|
---|
380 | * last 64 bits represent the length of the original message.
|
---|
381 | * All bits in between should be 0. This helper function will pad
|
---|
382 | * the message according to those rules by filling the
|
---|
383 | * Message_Block array accordingly. When it returns, it can be
|
---|
384 | * assumed that the message digest has been computed.
|
---|
385 | *
|
---|
386 | * Parameters:
|
---|
387 | * context: [in/out]
|
---|
388 | * The context to pad
|
---|
389 | * Pad_Byte: [in]
|
---|
390 | * The last byte to add to the digest before the 0-padding
|
---|
391 | * and length. This will contain the last bits of the message
|
---|
392 | * followed by another single bit. If the message was an
|
---|
393 | * exact multiple of 8-bits long, Pad_Byte will be 0x80.
|
---|
394 | *
|
---|
395 | * Returns:
|
---|
396 | * Nothing.
|
---|
397 | */
|
---|
398 | static void SHA224_256PadMessage(SHA256Context *context, uint8_t Pad_Byte)
|
---|
399 | {
|
---|
400 | /*
|
---|
401 | * Check to see if the current message block is too small to hold
|
---|
402 | * the initial padding bits and length. If so, we will pad the
|
---|
403 | * block, process it, and then continue padding into a second
|
---|
404 | * block.
|
---|
405 | */
|
---|
406 | if (context->Message_Block_Index >= (SHA256_Message_Block_Size - 8))
|
---|
407 | {
|
---|
408 | context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
|
---|
409 | while (context->Message_Block_Index < SHA256_Message_Block_Size)
|
---|
410 | {
|
---|
411 | context->Message_Block[context->Message_Block_Index++] = 0;
|
---|
412 | }
|
---|
413 | SHA224_256ProcessMessageBlock(context);
|
---|
414 | }
|
---|
415 | else
|
---|
416 | {
|
---|
417 | context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
|
---|
418 | }
|
---|
419 |
|
---|
420 | while (context->Message_Block_Index < (SHA256_Message_Block_Size - 8))
|
---|
421 | {
|
---|
422 | context->Message_Block[context->Message_Block_Index++] = 0;
|
---|
423 | }
|
---|
424 |
|
---|
425 | /*
|
---|
426 | * Store the message length as the last 8 octets
|
---|
427 | */
|
---|
428 | context->Message_Block[56] = (uint8_t)(context->Length_High >> 24);
|
---|
429 | context->Message_Block[57] = (uint8_t)(context->Length_High >> 16);
|
---|
430 | context->Message_Block[58] = (uint8_t)(context->Length_High >> 8);
|
---|
431 | context->Message_Block[59] = (uint8_t)(context->Length_High);
|
---|
432 | context->Message_Block[60] = (uint8_t)(context->Length_Low >> 24);
|
---|
433 | context->Message_Block[61] = (uint8_t)(context->Length_Low >> 16);
|
---|
434 | context->Message_Block[62] = (uint8_t)(context->Length_Low >> 8);
|
---|
435 | context->Message_Block[63] = (uint8_t)(context->Length_Low);
|
---|
436 |
|
---|
437 | SHA224_256ProcessMessageBlock(context);
|
---|
438 | }
|
---|
439 |
|
---|
440 | /*
|
---|
441 | * SHA224_256ProcessMessageBlock
|
---|
442 | *
|
---|
443 | * Description:
|
---|
444 | * This function will process the next 512 bits of the message
|
---|
445 | * stored in the Message_Block array.
|
---|
446 | *
|
---|
447 | * Parameters:
|
---|
448 | * context: [in/out]
|
---|
449 | * The SHA context to update
|
---|
450 | *
|
---|
451 | * Returns:
|
---|
452 | * Nothing.
|
---|
453 | *
|
---|
454 | * Comments:
|
---|
455 | * Many of the variable names in this code, especially the
|
---|
456 | * single character names, were used because those were the
|
---|
457 | * names used in the publication.
|
---|
458 | */
|
---|
459 | static void SHA224_256ProcessMessageBlock(SHA256Context *context)
|
---|
460 | {
|
---|
461 | /* Constants defined in FIPS-180-2, section 4.2.2 */
|
---|
462 | static const uint32_t K[64] = {
|
---|
463 | 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
|
---|
464 | 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
|
---|
465 | 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
|
---|
466 | 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
|
---|
467 | 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
|
---|
468 | 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
|
---|
469 | 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
|
---|
470 | 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
|
---|
471 | 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
|
---|
472 | 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
|
---|
473 | 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
|
---|
474 | 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
|
---|
475 | 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
|
---|
476 | };
|
---|
477 | int t, t4; /* Loop counter */
|
---|
478 | uint32_t temp1, temp2; /* Temporary word value */
|
---|
479 | uint32_t W[64]; /* Word sequence */
|
---|
480 | uint32_t A, B, C, D, E, F, G, H; /* Word buffers */
|
---|
481 |
|
---|
482 | /*
|
---|
483 | * Initialize the first 16 words in the array W
|
---|
484 | */
|
---|
485 | for (t = t4 = 0; t < 16; t++, t4 += 4)
|
---|
486 | {
|
---|
487 | W[t] = (((uint32_t)context->Message_Block[t4]) << 24) |
|
---|
488 | (((uint32_t)context->Message_Block[t4 + 1]) << 16) |
|
---|
489 | (((uint32_t)context->Message_Block[t4 + 2]) << 8) |
|
---|
490 | (((uint32_t)context->Message_Block[t4 + 3]));
|
---|
491 | }
|
---|
492 | for (t = 16; t < 64; t++)
|
---|
493 | {
|
---|
494 | W[t] = SHA256_sigma1(W[t - 2]) + W[t - 7] +
|
---|
495 | SHA256_sigma0(W[t - 15]) + W[t - 16];
|
---|
496 | }
|
---|
497 | A = context->Intermediate_Hash[0];
|
---|
498 | B = context->Intermediate_Hash[1];
|
---|
499 | C = context->Intermediate_Hash[2];
|
---|
500 | D = context->Intermediate_Hash[3];
|
---|
501 | E = context->Intermediate_Hash[4];
|
---|
502 | F = context->Intermediate_Hash[5];
|
---|
503 | G = context->Intermediate_Hash[6];
|
---|
504 | H = context->Intermediate_Hash[7];
|
---|
505 |
|
---|
506 | for (t = 0; t < 64; t++)
|
---|
507 | {
|
---|
508 | temp1 = H + SHA256_SIGMA1(E) + SHA_Ch(E, F, G) + K[t] + W[t];
|
---|
509 | temp2 = SHA256_SIGMA0(A) + SHA_Maj(A, B, C);
|
---|
510 | H = G;
|
---|
511 | G = F;
|
---|
512 | F = E;
|
---|
513 | E = D + temp1;
|
---|
514 | D = C;
|
---|
515 | C = B;
|
---|
516 | B = A;
|
---|
517 | A = temp1 + temp2;
|
---|
518 | }
|
---|
519 |
|
---|
520 | context->Intermediate_Hash[0] += A;
|
---|
521 | context->Intermediate_Hash[1] += B;
|
---|
522 | context->Intermediate_Hash[2] += C;
|
---|
523 | context->Intermediate_Hash[3] += D;
|
---|
524 | context->Intermediate_Hash[4] += E;
|
---|
525 | context->Intermediate_Hash[5] += F;
|
---|
526 | context->Intermediate_Hash[6] += G;
|
---|
527 | context->Intermediate_Hash[7] += H;
|
---|
528 |
|
---|
529 | context->Message_Block_Index = 0;
|
---|
530 | }
|
---|
531 |
|
---|
532 | /*
|
---|
533 | * SHA224_256Reset
|
---|
534 | *
|
---|
535 | * Description:
|
---|
536 | * This helper function will initialize the SHA256Context in
|
---|
537 | * preparation for computing a new SHA256 message digest.
|
---|
538 | *
|
---|
539 | * Parameters:
|
---|
540 | * context: [in/out]
|
---|
541 | * The context to reset.
|
---|
542 | * H0
|
---|
543 | * The initial hash value to use.
|
---|
544 | *
|
---|
545 | * Returns:
|
---|
546 | * sha Error Code.
|
---|
547 | */
|
---|
548 | static int SHA224_256Reset(SHA256Context *context, uint32_t *H0)
|
---|
549 | {
|
---|
550 | int result;
|
---|
551 | if (!context)
|
---|
552 | {
|
---|
553 | result = shaNull;
|
---|
554 | }
|
---|
555 | else
|
---|
556 | {
|
---|
557 | context->Length_Low = 0;
|
---|
558 | context->Length_High = 0;
|
---|
559 | context->Message_Block_Index = 0;
|
---|
560 |
|
---|
561 | context->Intermediate_Hash[0] = H0[0];
|
---|
562 | context->Intermediate_Hash[1] = H0[1];
|
---|
563 | context->Intermediate_Hash[2] = H0[2];
|
---|
564 | context->Intermediate_Hash[3] = H0[3];
|
---|
565 | context->Intermediate_Hash[4] = H0[4];
|
---|
566 | context->Intermediate_Hash[5] = H0[5];
|
---|
567 | context->Intermediate_Hash[6] = H0[6];
|
---|
568 | context->Intermediate_Hash[7] = H0[7];
|
---|
569 |
|
---|
570 | context->Computed = 0;
|
---|
571 | context->Corrupted = 0;
|
---|
572 | result = shaSuccess;
|
---|
573 | }
|
---|
574 | return result;
|
---|
575 | }
|
---|
576 |
|
---|
577 | /*
|
---|
578 | * SHA224_256ResultN
|
---|
579 | *
|
---|
580 | * Description:
|
---|
581 | * This helper function will return the 224-bit or 256-bit message
|
---|
582 | * digest into the Message_Digest array provided by the caller.
|
---|
583 | * NOTE: The first octet of hash is stored in the 0th element,
|
---|
584 | * the last octet of hash in the 28th/32nd element.
|
---|
585 | *
|
---|
586 | * Parameters:
|
---|
587 | * context: [in/out]
|
---|
588 | * The context to use to calculate the SHA hash.
|
---|
589 | * Message_Digest: [out]
|
---|
590 | * Where the digest is returned.
|
---|
591 | * HashSize: [in]
|
---|
592 | * The size of the hash, either 28 or 32.
|
---|
593 | *
|
---|
594 | * Returns:
|
---|
595 | * sha Error Code.
|
---|
596 | */
|
---|
597 | static int SHA224_256ResultN(SHA256Context *context, uint8_t Message_Digest[], int HashSize)
|
---|
598 | {
|
---|
599 | int result;
|
---|
600 | int i;
|
---|
601 |
|
---|
602 | if (!context || !Message_Digest)
|
---|
603 | {
|
---|
604 | result = shaNull;
|
---|
605 | }
|
---|
606 | else if (context->Corrupted)
|
---|
607 | {
|
---|
608 | result = context->Corrupted;
|
---|
609 | }
|
---|
610 | else
|
---|
611 | {
|
---|
612 | if (!context->Computed)
|
---|
613 | {
|
---|
614 | SHA224_256Finalize(context, 0x80);
|
---|
615 | }
|
---|
616 | for (i = 0; i < HashSize; ++i)
|
---|
617 | {
|
---|
618 | Message_Digest[i] = (uint8_t)(context->Intermediate_Hash[i >> 2] >> 8 * (3 - (i & 0x03)));
|
---|
619 | }
|
---|
620 | result = shaSuccess;
|
---|
621 | }
|
---|
622 | return result;
|
---|
623 | }
|
---|
624 |
|
---|