src/sha1.c

   1 /* This code is public-domain - it is based on libcrypt
   2  * placed in the public domain by Wei Dai and other contributors.
   3  */
   4 // gcc -Wall -DSHA1TEST -o sha1test sha1.c && ./sha1test
   5
   6 #include <stdint.h>
   7 #include <string.h>
   8
   9
  10 #ifdef __BIG_ENDIAN__
  11 # define SHA_BIG_ENDIAN
  12 #elif defined __LITTLE_ENDIAN__
  13 /* override */
  14 #elif defined __BYTE_ORDER
  15 # if __BYTE_ORDER__ ==  __ORDER_BIG_ENDIAN__
  16 # define SHA_BIG_ENDIAN
  17 # endif
  18 #else // ! defined __LITTLE_ENDIAN__
  19 # include <endian.h> // machine/endian.h
  20 # if __BYTE_ORDER__ ==  __ORDER_BIG_ENDIAN__
  21 #  define SHA_BIG_ENDIAN
  22 # endif
  23 #endif
  24
  25
  26 /* header */
  27
  28 #define HASH_LENGTH 20
  29 #define BLOCK_LENGTH 64
  30
  31 typedef struct sha1nfo {
  32         uint32_t buffer[BLOCK_LENGTH/4];
  33         uint32_t state[HASH_LENGTH/4];
  34         uint32_t byteCount;
  35         uint8_t bufferOffset;
  36         uint8_t keyBuffer[BLOCK_LENGTH];
  37         uint8_t innerHash[HASH_LENGTH];
  38 } sha1nfo;
  39
  40 /* public API - prototypes - TODO: doxygen*/
  41
  42 /**
  43  */
  44 void sha1_init(sha1nfo *s);
  45 /**
  46  */
  47 void sha1_writebyte(sha1nfo *s, uint8_t data);
  48 /**
  49  */
  50 void sha1_write(sha1nfo *s, const char *data, size_t len);
  51 /**
  52  */
  53 uint8_t* sha1_result(sha1nfo *s);
  54 /**
  55  */
  56 void sha1_initHmac(sha1nfo *s, const uint8_t* key, int keyLength);
  57 /**
  58  */
  59 uint8_t* sha1_resultHmac(sha1nfo *s);
  60
  61
  62 /* code */
  63 #define SHA1_K0  0x5a827999
  64 #define SHA1_K20 0x6ed9eba1
  65 #define SHA1_K40 0x8f1bbcdc
  66 #define SHA1_K60 0xca62c1d6
  67
  68 void sha1_init(sha1nfo *s) {
  69         s->state[0] = 0x67452301;
  70         s->state[1] = 0xefcdab89;
  71         s->state[2] = 0x98badcfe;
  72         s->state[3] = 0x10325476;
  73         s->state[4] = 0xc3d2e1f0;
  74         s->byteCount = 0;
  75         s->bufferOffset = 0;
  76 }
  77
  78 uint32_t sha1_rol32(uint32_t number, uint8_t bits) {
  79         return ((number << bits) | (number >> (32-bits)));
  80 }
  81
  82 void sha1_hashBlock(sha1nfo *s) {
  83         uint8_t i;
  84         uint32_t a,b,c,d,e,t;
  85
  86         a=s->state[0];
  87         b=s->state[1];
  88         c=s->state[2];
  89         d=s->state[3];
  90         e=s->state[4];
  91         for (i=0; i<80; i++) {
  92                 if (i>=16) {
  93                         t = s->buffer[(i+13)&15] ^ s->buffer[(i+8)&15] ^ s->buffer[(i+2)&15] ^ s->buffer[i&15];
  94                         s->buffer[i&15] = sha1_rol32(t,1);
  95                 }
  96                 if (i<20) {
  97                         t = (d ^ (b & (c ^ d))) + SHA1_K0;
  98                 } else if (i<40) {
  99                         t = (b ^ c ^ d) + SHA1_K20;
 100                 } else if (i<60) {
 101                         t = ((b & c) | (d & (b | c))) + SHA1_K40;
 102                 } else {
 103                         t = (b ^ c ^ d) + SHA1_K60;
 104                 }
 105                 t+=sha1_rol32(a,5) + e + s->buffer[i&15];
 106                 e=d;
 107                 d=c;
 108                 c=sha1_rol32(b,30);
 109                 b=a;
 110                 a=t;
 111         }
 112         s->state[0] += a;
 113         s->state[1] += b;
 114         s->state[2] += c;
 115         s->state[3] += d;
 116         s->state[4] += e;
 117 }
 118
 119 void sha1_addUncounted(sha1nfo *s, uint8_t data) {
 120         uint8_t * const b = (uint8_t*) s->buffer;
 121 #ifdef SHA_BIG_ENDIAN
 122         b[s->bufferOffset] = data;
 123 #else
 124         b[s->bufferOffset ^ 3] = data;
 125 #endif
 126         s->bufferOffset++;
 127         if (s->bufferOffset == BLOCK_LENGTH) {
 128                 sha1_hashBlock(s);
 129                 s->bufferOffset = 0;
 130         }
 131 }
 132
 133 void sha1_writebyte(sha1nfo *s, uint8_t data) {
 134         ++s->byteCount;
 135         sha1_addUncounted(s, data);
 136 }
 137
 138 void sha1_write(sha1nfo *s, const char *data, size_t len) {
 139         for (;len--;) sha1_writebyte(s, (uint8_t) *data++);
 140 }
 141
 142 void sha1_pad(sha1nfo *s) {
 143         // Implement SHA-1 padding (fips180-2 §5.1.1)
 144
 145         // Pad with 0x80 followed by 0x00 until the end of the block
 146         sha1_addUncounted(s, 0x80);
 147         while (s->bufferOffset != 56) sha1_addUncounted(s, 0x00);
 148
 149         // Append length in the last 8 bytes
 150         sha1_addUncounted(s, 0); // We're only using 32 bit lengths
 151         sha1_addUncounted(s, 0); // But SHA-1 supports 64 bit lengths
 152         sha1_addUncounted(s, 0); // So zero pad the top bits
 153         sha1_addUncounted(s, s->byteCount >> 29); // Shifting to multiply by 8
 154         sha1_addUncounted(s, s->byteCount >> 21); // as SHA-1 supports bitstreams as well as
 155         sha1_addUncounted(s, s->byteCount >> 13); // byte.
 156         sha1_addUncounted(s, s->byteCount >> 5);
 157         sha1_addUncounted(s, s->byteCount << 3);
 158 }
 159
 160 uint8_t* sha1_result(sha1nfo *s) {
 161         // Pad to complete the last block
 162         sha1_pad(s);
 163
 164 #ifndef SHA_BIG_ENDIAN
 165         // Swap byte order back
 166         int i;
 167         for (i=0; i<5; i++) {
 168                 s->state[i]=
 169                           (((s->state[i])<<24)& 0xff000000)
 170                         | (((s->state[i])<<8) & 0x00ff0000)
 171                         | (((s->state[i])>>8) & 0x0000ff00)
 172                         | (((s->state[i])>>24)& 0x000000ff);
 173         }
 174 #endif
 175
 176         // Return pointer to hash (20 characters)
 177         return (uint8_t*) s->state;
 178 }
 179
 180 #define HMAC_IPAD 0x36
 181 #define HMAC_OPAD 0x5c
 182
 183 void sha1_initHmac(sha1nfo *s, const uint8_t* key, int keyLength) {
 184         uint8_t i;
 185         memset(s->keyBuffer, 0, BLOCK_LENGTH);
 186         if (keyLength > BLOCK_LENGTH) {
 187                 // Hash long keys
 188                 sha1_init(s);
 189                 for (;keyLength--;) sha1_writebyte(s, *key++);
 190                 memcpy(s->keyBuffer, sha1_result(s), HASH_LENGTH);
 191         } else {
 192                 // Block length keys are used as is
 193                 memcpy(s->keyBuffer, key, keyLength);
 194         }
 195         // Start inner hash
 196         sha1_init(s);
 197         for (i=0; i<BLOCK_LENGTH; i++) {
 198                 sha1_writebyte(s, s->keyBuffer[i] ^ HMAC_IPAD);
 199         }
 200 }
 201
 202 uint8_t* sha1_resultHmac(sha1nfo *s) {
 203         uint8_t i;
 204         // Complete inner hash
 205         memcpy(s->innerHash,sha1_result(s),HASH_LENGTH);
 206         // Calculate outer hash
 207         sha1_init(s);
 208         for (i=0; i<BLOCK_LENGTH; i++) sha1_writebyte(s, s->keyBuffer[i] ^ HMAC_OPAD);
 209         for (i=0; i<HASH_LENGTH; i++) sha1_writebyte(s, s->innerHash[i]);
 210         return sha1_result(s);
 211 }
 212
 213 /* self-test */
 214
 215 #if SHA1TEST
 216 #include <stdio.h>
 217
 218 uint8_t hmacKey1[]={
 219    0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,
 220    0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,
 221    0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
 222    0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f
 223 };
 224 uint8_t hmacKey2[]={
 225    0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
 226    0x40,0x41,0x42,0x43
 227 };
 228 uint8_t hmacKey3[]={
 229    0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f,
 230    0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
 231    0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f,
 232    0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f,
 233    0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f,
 234    0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf,
 235    0xb0,0xb1,0xb2,0xb3
 236 };
 237 uint8_t hmacKey4[]={
 238    0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f,
 239    0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f,
 240    0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f,
 241    0xa0
 242 };
 243
 244 void printHash(uint8_t* hash) {
 245         int i;
 246         for (i=0; i<20; i++) {
 247                 printf("%02x", hash[i]);
 248         }
 249         printf("\n");
 250 }
 251
 252
 253 int main (int argc, char **argv) {
 254         uint32_t a;
 255         sha1nfo s;
 256
 257         // SHA tests
 258         printf("Test: FIPS 180-2 C.1 and RFC3174 7.3 TEST1\n");
 259         printf("Expect:a9993e364706816aba3e25717850c26c9cd0d89d\n");
 260         printf("Result:");
 261         sha1_init(&s);
 262         sha1_write(&s, "abc", 3);
 263         printHash(sha1_result(&s));
 264         printf("\n\n");
 265
 266         printf("Test: FIPS 180-2 C.2 and RFC3174 7.3 TEST2\n");
 267         printf("Expect:84983e441c3bd26ebaae4aa1f95129e5e54670f1\n");
 268         printf("Result:");
 269         sha1_init(&s);
 270         sha1_write(&s, "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56);
 271         printHash(sha1_result(&s));
 272         printf("\n\n");
 273
 274         printf("Test: RFC3174 7.3 TEST4\n");
 275         printf("Expect:dea356a2cddd90c7a7ecedc5ebb563934f460452\n");
 276         printf("Result:");
 277         sha1_init(&s);
 278         for (a=0; a<80; a++) sha1_write(&s, "01234567", 8);
 279         printHash(sha1_result(&s));
 280         printf("\n\n");
 281
 282         // HMAC tests
 283         printf("Test: FIPS 198a A.1\n");
 284         printf("Expect:4f4ca3d5d68ba7cc0a1208c9c61e9c5da0403c0a\n");
 285         printf("Result:");
 286         sha1_initHmac(&s, hmacKey1, 64);
 287         sha1_write(&s, "Sample #1",9);
 288         printHash(sha1_resultHmac(&s));
 289         printf("\n\n");
 290
 291         printf("Test: FIPS 198a A.2\n");
 292         printf("Expect:0922d3405faa3d194f82a45830737d5cc6c75d24\n");
 293         printf("Result:");
 294         sha1_initHmac(&s, hmacKey2, 20);
 295         sha1_write(&s, "Sample #2", 9);
 296         printHash(sha1_resultHmac(&s));
 297         printf("\n\n");
 298
 299         printf("Test: FIPS 198a A.3\n");
 300         printf("Expect:bcf41eab8bb2d802f3d05caf7cb092ecf8d1a3aa\n");
 301         printf("Result:");
 302         sha1_initHmac(&s, hmacKey3,100);
 303         sha1_write(&s, "Sample #3", 9);
 304         printHash(sha1_resultHmac(&s));
 305         printf("\n\n");
 306
 307         printf("Test: FIPS 198a A.4\n");
 308         printf("Expect:9ea886efe268dbecce420c7524df32e0751a2a26\n");
 309         printf("Result:");
 310         sha1_initHmac(&s, hmacKey4,49);
 311         sha1_write(&s, "Sample #4", 9);
 312         printHash(sha1_resultHmac(&s));
 313         printf("\n\n");
 314
 315         // Long tests
 316         printf("Test: FIPS 180-2 C.3 and RFC3174 7.3 TEST3\n");
 317         printf("Expect:34aa973cd4c4daa4f61eeb2bdbad27316534016f\n");
 318         printf("Result:");
 319         sha1_init(&s);
 320         for (a=0; a<1000000; a++) sha1_writebyte(&s, 'a');
 321         printHash(sha1_result(&s));
 322
 323         return 0;
 324 }
 325 #endif /* self-test */