Hayato Hiratori / WebSocketServer

Simple WebSocket server library.

Dependents:   WebSocketServerTest

sha1.cpp@2:db41b4e0d64b, 2015-04-06 (annotated)

Committer:
flatbird
Date:
Mon Apr 06 12:55:41 2015 +0000
Revision:
2:db41b4e0d64b
Parent:
0:a816c25e83ed 
add LICENSE.txt (MIT License)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
flatbird 0:a816c25e83ed 1 /*
flatbird 0:a816c25e83ed 2 * From RFC3174
flatbird 0:a816c25e83ed 3 */
flatbird 0:a816c25e83ed 4 /*
flatbird 0:a816c25e83ed 5 * sha1.c
flatbird 0:a816c25e83ed 6 *
flatbird 0:a816c25e83ed 7 * Description:
flatbird 0:a816c25e83ed 8 * This file implements the Secure Hashing Algorithm 1 as
flatbird 0:a816c25e83ed 9 * defined in FIPS PUB 180-1 published April 17, 1995.
flatbird 0:a816c25e83ed 10 *
flatbird 0:a816c25e83ed 11 * The SHA-1, produces a 160-bit message digest for a given
flatbird 0:a816c25e83ed 12 * data stream. It should take about 2**n steps to find a
flatbird 0:a816c25e83ed 13 * message with the same digest as a given message and
flatbird 0:a816c25e83ed 14 * 2**(n/2) to find any two messages with the same digest,
flatbird 0:a816c25e83ed 15 * when n is the digest size in bits. Therefore, this
flatbird 0:a816c25e83ed 16 * algorithm can serve as a means of providing a
flatbird 0:a816c25e83ed 17 * "fingerprint" for a message.
flatbird 0:a816c25e83ed 18 *
flatbird 0:a816c25e83ed 19 * Portability Issues:
flatbird 0:a816c25e83ed 20 * SHA-1 is defined in terms of 32-bit "words". This code
flatbird 0:a816c25e83ed 21 * uses <stdint.h> (included via "sha1.h" to define 32 and 8
flatbird 0:a816c25e83ed 22 * bit unsigned integer types. If your C compiler does not
flatbird 0:a816c25e83ed 23 * support 32 bit unsigned integers, this code is not
flatbird 0:a816c25e83ed 24 * appropriate.
flatbird 0:a816c25e83ed 25 *
flatbird 0:a816c25e83ed 26 * Caveats:
flatbird 0:a816c25e83ed 27 * SHA-1 is designed to work with messages less than 2^64 bits
flatbird 0:a816c25e83ed 28 * long. Although SHA-1 allows a message digest to be generated
flatbird 0:a816c25e83ed 29 * for messages of any number of bits less than 2^64, this
flatbird 0:a816c25e83ed 30 * implementation only works with messages with a length that is
flatbird 0:a816c25e83ed 31 * a multiple of the size of an 8-bit character.
flatbird 0:a816c25e83ed 32 *
flatbird 0:a816c25e83ed 33 */
flatbird 0:a816c25e83ed 34 #include "sha1.h"
flatbird 0:a816c25e83ed 35
flatbird 0:a816c25e83ed 36 /*
flatbird 0:a816c25e83ed 37 * Define the SHA1 circular left shift macro
flatbird 0:a816c25e83ed 38 */
flatbird 0:a816c25e83ed 39 #define SHA1CircularShift(bits,word) \
flatbird 0:a816c25e83ed 40 (((word) << (bits)) | ((word) >> (32-(bits))))
flatbird 0:a816c25e83ed 41
flatbird 0:a816c25e83ed 42 /* Local Function Prototyptes */
flatbird 0:a816c25e83ed 43 void SHA1PadMessage(SHA1Context *);
flatbird 0:a816c25e83ed 44 void SHA1ProcessMessageBlock(SHA1Context *);
flatbird 0:a816c25e83ed 45
flatbird 0:a816c25e83ed 46 /*
flatbird 0:a816c25e83ed 47 * SHA1Reset
flatbird 0:a816c25e83ed 48 *
flatbird 0:a816c25e83ed 49 * Description:
flatbird 0:a816c25e83ed 50 * This function will initialize the SHA1Context in preparation
flatbird 0:a816c25e83ed 51 * for computing a new SHA1 message digest.
flatbird 0:a816c25e83ed 52 *
flatbird 0:a816c25e83ed 53 * Parameters:
flatbird 0:a816c25e83ed 54 * context: [in/out]
flatbird 0:a816c25e83ed 55 * The context to reset.
flatbird 0:a816c25e83ed 56 *
flatbird 0:a816c25e83ed 57 * Returns:
flatbird 0:a816c25e83ed 58 * sha Error Code.
flatbird 0:a816c25e83ed 59 *
flatbird 0:a816c25e83ed 60 */
flatbird 0:a816c25e83ed 61 int SHA1Reset(SHA1Context *context)
flatbird 0:a816c25e83ed 62 {
flatbird 0:a816c25e83ed 63 if (!context)
flatbird 0:a816c25e83ed 64 {
flatbird 0:a816c25e83ed 65 return shaNull;
flatbird 0:a816c25e83ed 66 }
flatbird 0:a816c25e83ed 67
flatbird 0:a816c25e83ed 68 context->Length_Low = 0;
flatbird 0:a816c25e83ed 69 context->Length_High = 0;
flatbird 0:a816c25e83ed 70 context->Message_Block_Index = 0;
flatbird 0:a816c25e83ed 71
flatbird 0:a816c25e83ed 72 context->Intermediate_Hash[0] = 0x67452301;
flatbird 0:a816c25e83ed 73 context->Intermediate_Hash[1] = 0xEFCDAB89;
flatbird 0:a816c25e83ed 74 context->Intermediate_Hash[2] = 0x98BADCFE;
flatbird 0:a816c25e83ed 75 context->Intermediate_Hash[3] = 0x10325476;
flatbird 0:a816c25e83ed 76 context->Intermediate_Hash[4] = 0xC3D2E1F0;
flatbird 0:a816c25e83ed 77
flatbird 0:a816c25e83ed 78 context->Computed = 0;
flatbird 0:a816c25e83ed 79 context->Corrupted = 0;
flatbird 0:a816c25e83ed 80
flatbird 0:a816c25e83ed 81 return shaSuccess;
flatbird 0:a816c25e83ed 82 }
flatbird 0:a816c25e83ed 83
flatbird 0:a816c25e83ed 84 /*
flatbird 0:a816c25e83ed 85 * SHA1Result
flatbird 0:a816c25e83ed 86 *
flatbird 0:a816c25e83ed 87 * Description:
flatbird 0:a816c25e83ed 88 * This function will return the 160-bit message digest into the
flatbird 0:a816c25e83ed 89 * Message_Digest array provided by the caller.
flatbird 0:a816c25e83ed 90 * NOTE: The first octet of hash is stored in the 0th element,
flatbird 0:a816c25e83ed 91 * the last octet of hash in the 19th element.
flatbird 0:a816c25e83ed 92 *
flatbird 0:a816c25e83ed 93 * Parameters:
flatbird 0:a816c25e83ed 94 * context: [in/out]
flatbird 0:a816c25e83ed 95 * The context to use to calculate the SHA-1 hash.
flatbird 0:a816c25e83ed 96 * Message_Digest: [out]
flatbird 0:a816c25e83ed 97 * Where the digest is returned.
flatbird 0:a816c25e83ed 98 *
flatbird 0:a816c25e83ed 99 * Returns:
flatbird 0:a816c25e83ed 100 * sha Error Code.
flatbird 0:a816c25e83ed 101 *
flatbird 0:a816c25e83ed 102 */
flatbird 0:a816c25e83ed 103 int SHA1Result( SHA1Context *context,
flatbird 0:a816c25e83ed 104 uint8_t Message_Digest[SHA1HashSize])
flatbird 0:a816c25e83ed 105 {
flatbird 0:a816c25e83ed 106 int i;
flatbird 0:a816c25e83ed 107
flatbird 0:a816c25e83ed 108 if (!context || !Message_Digest)
flatbird 0:a816c25e83ed 109 {
flatbird 0:a816c25e83ed 110 return shaNull;
flatbird 0:a816c25e83ed 111 }
flatbird 0:a816c25e83ed 112
flatbird 0:a816c25e83ed 113 if (context->Corrupted)
flatbird 0:a816c25e83ed 114 {
flatbird 0:a816c25e83ed 115 return context->Corrupted;
flatbird 0:a816c25e83ed 116 }
flatbird 0:a816c25e83ed 117
flatbird 0:a816c25e83ed 118 if (!context->Computed)
flatbird 0:a816c25e83ed 119 {
flatbird 0:a816c25e83ed 120 SHA1PadMessage(context);
flatbird 0:a816c25e83ed 121 for(i=0; i<64; ++i)
flatbird 0:a816c25e83ed 122 {
flatbird 0:a816c25e83ed 123 /* message may be sensitive, clear it out */
flatbird 0:a816c25e83ed 124 context->Message_Block[i] = 0;
flatbird 0:a816c25e83ed 125 }
flatbird 0:a816c25e83ed 126 context->Length_Low = 0; /* and clear length */
flatbird 0:a816c25e83ed 127 context->Length_High = 0;
flatbird 0:a816c25e83ed 128 context->Computed = 1;
flatbird 0:a816c25e83ed 129 }
flatbird 0:a816c25e83ed 130
flatbird 0:a816c25e83ed 131 for(i = 0; i < SHA1HashSize; ++i)
flatbird 0:a816c25e83ed 132 {
flatbird 0:a816c25e83ed 133 Message_Digest[i] = context->Intermediate_Hash[i>>2]
flatbird 0:a816c25e83ed 134 >> 8 * ( 3 - ( i & 0x03 ) );
flatbird 0:a816c25e83ed 135 }
flatbird 0:a816c25e83ed 136
flatbird 0:a816c25e83ed 137 return shaSuccess;
flatbird 0:a816c25e83ed 138 }
flatbird 0:a816c25e83ed 139
flatbird 0:a816c25e83ed 140 /*
flatbird 0:a816c25e83ed 141 * SHA1Input
flatbird 0:a816c25e83ed 142 *
flatbird 0:a816c25e83ed 143 * Description:
flatbird 0:a816c25e83ed 144 * This function accepts an array of octets as the next portion
flatbird 0:a816c25e83ed 145 * of the message.
flatbird 0:a816c25e83ed 146 *
flatbird 0:a816c25e83ed 147 * Parameters:
flatbird 0:a816c25e83ed 148 * context: [in/out]
flatbird 0:a816c25e83ed 149 * The SHA context to update
flatbird 0:a816c25e83ed 150 * message_array: [in]
flatbird 0:a816c25e83ed 151 * An array of characters representing the next portion of
flatbird 0:a816c25e83ed 152 * the message.
flatbird 0:a816c25e83ed 153 * length: [in]
flatbird 0:a816c25e83ed 154 * The length of the message in message_array
flatbird 0:a816c25e83ed 155 *
flatbird 0:a816c25e83ed 156 * Returns:
flatbird 0:a816c25e83ed 157 * sha Error Code.
flatbird 0:a816c25e83ed 158 *
flatbird 0:a816c25e83ed 159 */
flatbird 0:a816c25e83ed 160 int SHA1Input( SHA1Context *context,
flatbird 0:a816c25e83ed 161 const uint8_t *message_array,
flatbird 0:a816c25e83ed 162 unsigned length)
flatbird 0:a816c25e83ed 163 {
flatbird 0:a816c25e83ed 164 if (!length)
flatbird 0:a816c25e83ed 165 {
flatbird 0:a816c25e83ed 166 return shaSuccess;
flatbird 0:a816c25e83ed 167 }
flatbird 0:a816c25e83ed 168
flatbird 0:a816c25e83ed 169 if (!context || !message_array)
flatbird 0:a816c25e83ed 170 {
flatbird 0:a816c25e83ed 171 return shaNull;
flatbird 0:a816c25e83ed 172 }
flatbird 0:a816c25e83ed 173
flatbird 0:a816c25e83ed 174 if (context->Computed)
flatbird 0:a816c25e83ed 175 {
flatbird 0:a816c25e83ed 176 context->Corrupted = shaStateError;
flatbird 0:a816c25e83ed 177 return shaStateError;
flatbird 0:a816c25e83ed 178 }
flatbird 0:a816c25e83ed 179
flatbird 0:a816c25e83ed 180 if (context->Corrupted)
flatbird 0:a816c25e83ed 181 {
flatbird 0:a816c25e83ed 182 return context->Corrupted;
flatbird 0:a816c25e83ed 183 }
flatbird 0:a816c25e83ed 184 while(length-- && !context->Corrupted)
flatbird 0:a816c25e83ed 185 {
flatbird 0:a816c25e83ed 186 context->Message_Block[context->Message_Block_Index++] =
flatbird 0:a816c25e83ed 187 (*message_array & 0xFF);
flatbird 0:a816c25e83ed 188
flatbird 0:a816c25e83ed 189 context->Length_Low += 8;
flatbird 0:a816c25e83ed 190 if (context->Length_Low == 0)
flatbird 0:a816c25e83ed 191 {
flatbird 0:a816c25e83ed 192 context->Length_High++;
flatbird 0:a816c25e83ed 193 if (context->Length_High == 0)
flatbird 0:a816c25e83ed 194 {
flatbird 0:a816c25e83ed 195 /* Message is too long */
flatbird 0:a816c25e83ed 196 context->Corrupted = 1;
flatbird 0:a816c25e83ed 197 }
flatbird 0:a816c25e83ed 198 }
flatbird 0:a816c25e83ed 199
flatbird 0:a816c25e83ed 200 if (context->Message_Block_Index == 64)
flatbird 0:a816c25e83ed 201 {
flatbird 0:a816c25e83ed 202 SHA1ProcessMessageBlock(context);
flatbird 0:a816c25e83ed 203 }
flatbird 0:a816c25e83ed 204
flatbird 0:a816c25e83ed 205 message_array++;
flatbird 0:a816c25e83ed 206 }
flatbird 0:a816c25e83ed 207
flatbird 0:a816c25e83ed 208 return shaSuccess;
flatbird 0:a816c25e83ed 209 }
flatbird 0:a816c25e83ed 210
flatbird 0:a816c25e83ed 211 /*
flatbird 0:a816c25e83ed 212 * SHA1ProcessMessageBlock
flatbird 0:a816c25e83ed 213 *
flatbird 0:a816c25e83ed 214 * Description:
flatbird 0:a816c25e83ed 215 * This function will process the next 512 bits of the message
flatbird 0:a816c25e83ed 216 * stored in the Message_Block array.
flatbird 0:a816c25e83ed 217 *
flatbird 0:a816c25e83ed 218 * Parameters:
flatbird 0:a816c25e83ed 219 * None.
flatbird 0:a816c25e83ed 220 *
flatbird 0:a816c25e83ed 221 * Returns:
flatbird 0:a816c25e83ed 222 * Nothing.
flatbird 0:a816c25e83ed 223 *
flatbird 0:a816c25e83ed 224 * Comments:
flatbird 0:a816c25e83ed 225 * Many of the variable names in this code, especially the
flatbird 0:a816c25e83ed 226 * single character names, were used because those were the
flatbird 0:a816c25e83ed 227 * names used in the publication.
flatbird 0:a816c25e83ed 228 *
flatbird 0:a816c25e83ed 229 *
flatbird 0:a816c25e83ed 230 */
flatbird 0:a816c25e83ed 231 void SHA1ProcessMessageBlock(SHA1Context *context)
flatbird 0:a816c25e83ed 232 {
flatbird 0:a816c25e83ed 233 const uint32_t K[] = { /* Constants defined in SHA-1 */
flatbird 0:a816c25e83ed 234 0x5A827999,
flatbird 0:a816c25e83ed 235 0x6ED9EBA1,
flatbird 0:a816c25e83ed 236 0x8F1BBCDC,
flatbird 0:a816c25e83ed 237 0xCA62C1D6
flatbird 0:a816c25e83ed 238 };
flatbird 0:a816c25e83ed 239 int t; /* Loop counter */
flatbird 0:a816c25e83ed 240 uint32_t temp; /* Temporary word value */
flatbird 0:a816c25e83ed 241 uint32_t W[80]; /* Word sequence */
flatbird 0:a816c25e83ed 242 uint32_t A, B, C, D, E; /* Word buffers */
flatbird 0:a816c25e83ed 243
flatbird 0:a816c25e83ed 244 /*
flatbird 0:a816c25e83ed 245 * Initialize the first 16 words in the array W
flatbird 0:a816c25e83ed 246 */
flatbird 0:a816c25e83ed 247 for(t = 0; t < 16; t++)
flatbird 0:a816c25e83ed 248 {
flatbird 0:a816c25e83ed 249 W[t] = context->Message_Block[t * 4] << 24;
flatbird 0:a816c25e83ed 250 W[t] |= context->Message_Block[t * 4 + 1] << 16;
flatbird 0:a816c25e83ed 251 W[t] |= context->Message_Block[t * 4 + 2] << 8;
flatbird 0:a816c25e83ed 252 W[t] |= context->Message_Block[t * 4 + 3];
flatbird 0:a816c25e83ed 253 }
flatbird 0:a816c25e83ed 254
flatbird 0:a816c25e83ed 255 for(t = 16; t < 80; t++)
flatbird 0:a816c25e83ed 256 {
flatbird 0:a816c25e83ed 257 W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);
flatbird 0:a816c25e83ed 258 }
flatbird 0:a816c25e83ed 259
flatbird 0:a816c25e83ed 260 A = context->Intermediate_Hash[0];
flatbird 0:a816c25e83ed 261 B = context->Intermediate_Hash[1];
flatbird 0:a816c25e83ed 262 C = context->Intermediate_Hash[2];
flatbird 0:a816c25e83ed 263 D = context->Intermediate_Hash[3];
flatbird 0:a816c25e83ed 264 E = context->Intermediate_Hash[4];
flatbird 0:a816c25e83ed 265
flatbird 0:a816c25e83ed 266 for(t = 0; t < 20; t++)
flatbird 0:a816c25e83ed 267 {
flatbird 0:a816c25e83ed 268 temp = SHA1CircularShift(5,A) +
flatbird 0:a816c25e83ed 269 ((B & C) | ((~B) & D)) + E + W[t] + K[0];
flatbird 0:a816c25e83ed 270 E = D;
flatbird 0:a816c25e83ed 271 D = C;
flatbird 0:a816c25e83ed 272 C = SHA1CircularShift(30,B);
flatbird 0:a816c25e83ed 273 B = A;
flatbird 0:a816c25e83ed 274 A = temp;
flatbird 0:a816c25e83ed 275 }
flatbird 0:a816c25e83ed 276
flatbird 0:a816c25e83ed 277 for(t = 20; t < 40; t++)
flatbird 0:a816c25e83ed 278 {
flatbird 0:a816c25e83ed 279 temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[1];
flatbird 0:a816c25e83ed 280 E = D;
flatbird 0:a816c25e83ed 281 D = C;
flatbird 0:a816c25e83ed 282 C = SHA1CircularShift(30,B);
flatbird 0:a816c25e83ed 283 B = A;
flatbird 0:a816c25e83ed 284 A = temp;
flatbird 0:a816c25e83ed 285 }
flatbird 0:a816c25e83ed 286
flatbird 0:a816c25e83ed 287 for(t = 40; t < 60; t++)
flatbird 0:a816c25e83ed 288 {
flatbird 0:a816c25e83ed 289 temp = SHA1CircularShift(5,A) +
flatbird 0:a816c25e83ed 290 ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2];
flatbird 0:a816c25e83ed 291 E = D;
flatbird 0:a816c25e83ed 292 D = C;
flatbird 0:a816c25e83ed 293 C = SHA1CircularShift(30,B);
flatbird 0:a816c25e83ed 294 B = A;
flatbird 0:a816c25e83ed 295 A = temp;
flatbird 0:a816c25e83ed 296 }
flatbird 0:a816c25e83ed 297
flatbird 0:a816c25e83ed 298 for(t = 60; t < 80; t++)
flatbird 0:a816c25e83ed 299 {
flatbird 0:a816c25e83ed 300 temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[3];
flatbird 0:a816c25e83ed 301 E = D;
flatbird 0:a816c25e83ed 302 D = C;
flatbird 0:a816c25e83ed 303 C = SHA1CircularShift(30,B);
flatbird 0:a816c25e83ed 304 B = A;
flatbird 0:a816c25e83ed 305 A = temp;
flatbird 0:a816c25e83ed 306 }
flatbird 0:a816c25e83ed 307
flatbird 0:a816c25e83ed 308 context->Intermediate_Hash[0] += A;
flatbird 0:a816c25e83ed 309 context->Intermediate_Hash[1] += B;
flatbird 0:a816c25e83ed 310 context->Intermediate_Hash[2] += C;
flatbird 0:a816c25e83ed 311 context->Intermediate_Hash[3] += D;
flatbird 0:a816c25e83ed 312 context->Intermediate_Hash[4] += E;
flatbird 0:a816c25e83ed 313
flatbird 0:a816c25e83ed 314 context->Message_Block_Index = 0;
flatbird 0:a816c25e83ed 315 }
flatbird 0:a816c25e83ed 316
flatbird 0:a816c25e83ed 317
flatbird 0:a816c25e83ed 318 /*
flatbird 0:a816c25e83ed 319 * SHA1PadMessage
flatbird 0:a816c25e83ed 320 *
flatbird 0:a816c25e83ed 321 * Description:
flatbird 0:a816c25e83ed 322 * According to the standard, the message must be padded to an even
flatbird 0:a816c25e83ed 323 * 512 bits. The first padding bit must be a '1'. The last 64
flatbird 0:a816c25e83ed 324 * bits represent the length of the original message. All bits in
flatbird 0:a816c25e83ed 325 * between should be 0. This function will pad the message
flatbird 0:a816c25e83ed 326 * according to those rules by filling the Message_Block array
flatbird 0:a816c25e83ed 327 * accordingly. It will also call the ProcessMessageBlock function
flatbird 0:a816c25e83ed 328 * provided appropriately. When it returns, it can be assumed that
flatbird 0:a816c25e83ed 329 * the message digest has been computed.
flatbird 0:a816c25e83ed 330 *
flatbird 0:a816c25e83ed 331 * Parameters:
flatbird 0:a816c25e83ed 332 * context: [in/out]
flatbird 0:a816c25e83ed 333 * The context to pad
flatbird 0:a816c25e83ed 334 * ProcessMessageBlock: [in]
flatbird 0:a816c25e83ed 335 * The appropriate SHA*ProcessMessageBlock function
flatbird 0:a816c25e83ed 336 * Returns:
flatbird 0:a816c25e83ed 337 * Nothing.
flatbird 0:a816c25e83ed 338 *
flatbird 0:a816c25e83ed 339 */
flatbird 0:a816c25e83ed 340
flatbird 0:a816c25e83ed 341 void SHA1PadMessage(SHA1Context *context)
flatbird 0:a816c25e83ed 342 {
flatbird 0:a816c25e83ed 343 /*
flatbird 0:a816c25e83ed 344 * Check to see if the current message block is too small to hold
flatbird 0:a816c25e83ed 345 * the initial padding bits and length. If so, we will pad the
flatbird 0:a816c25e83ed 346 * block, process it, and then continue padding into a second
flatbird 0:a816c25e83ed 347 * block.
flatbird 0:a816c25e83ed 348 */
flatbird 0:a816c25e83ed 349 if (context->Message_Block_Index > 55)
flatbird 0:a816c25e83ed 350 {
flatbird 0:a816c25e83ed 351 context->Message_Block[context->Message_Block_Index++] = 0x80;
flatbird 0:a816c25e83ed 352 while(context->Message_Block_Index < 64)
flatbird 0:a816c25e83ed 353 {
flatbird 0:a816c25e83ed 354 context->Message_Block[context->Message_Block_Index++] = 0;
flatbird 0:a816c25e83ed 355 }
flatbird 0:a816c25e83ed 356
flatbird 0:a816c25e83ed 357 SHA1ProcessMessageBlock(context);
flatbird 0:a816c25e83ed 358
flatbird 0:a816c25e83ed 359 while(context->Message_Block_Index < 56)
flatbird 0:a816c25e83ed 360 {
flatbird 0:a816c25e83ed 361 context->Message_Block[context->Message_Block_Index++] = 0;
flatbird 0:a816c25e83ed 362 }
flatbird 0:a816c25e83ed 363 }
flatbird 0:a816c25e83ed 364 else
flatbird 0:a816c25e83ed 365 {
flatbird 0:a816c25e83ed 366 context->Message_Block[context->Message_Block_Index++] = 0x80;
flatbird 0:a816c25e83ed 367 while(context->Message_Block_Index < 56)
flatbird 0:a816c25e83ed 368 {
flatbird 0:a816c25e83ed 369 context->Message_Block[context->Message_Block_Index++] = 0;
flatbird 0:a816c25e83ed 370 }
flatbird 0:a816c25e83ed 371 }
flatbird 0:a816c25e83ed 372
flatbird 0:a816c25e83ed 373 /*
flatbird 0:a816c25e83ed 374 * Store the message length as the last 8 octets
flatbird 0:a816c25e83ed 375 */
flatbird 0:a816c25e83ed 376 context->Message_Block[56] = context->Length_High >> 24;
flatbird 0:a816c25e83ed 377 context->Message_Block[57] = context->Length_High >> 16;
flatbird 0:a816c25e83ed 378 context->Message_Block[58] = context->Length_High >> 8;
flatbird 0:a816c25e83ed 379 context->Message_Block[59] = context->Length_High;
flatbird 0:a816c25e83ed 380 context->Message_Block[60] = context->Length_Low >> 24;
flatbird 0:a816c25e83ed 381 context->Message_Block[61] = context->Length_Low >> 16;
flatbird 0:a816c25e83ed 382 context->Message_Block[62] = context->Length_Low >> 8;
flatbird 0:a816c25e83ed 383 context->Message_Block[63] = context->Length_Low;
flatbird 0:a816c25e83ed 384
flatbird 0:a816c25e83ed 385 SHA1ProcessMessageBlock(context);
flatbird 0:a816c25e83ed 386 }