#include <stdint.h>
#include <string.h> /* for memcpy, memmove, memset */
+#include <avr/pgmspace.h>
#include "sha256.h"
#define LITTLE_ENDIAN
/*************************************************************************/
-uint32_t sha256_init_vector[]={
- 0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
- 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19 };
+static const uint32_t sha256_init_vector[] PROGMEM = {
+ 0x6A09E667UL, 0xBB67AE85UL, 0x3C6EF372UL, 0xA54FF53AUL,
+ 0x510E527FUL, 0x9B05688CUL, 0x1F83D9ABUL, 0x5BE0CD19UL };
/*************************************************************************/
* @return none
*/
void sha256_init(sha256_ctx_t *state){
- state->length=0;
- memcpy(state->h, sha256_init_vector, 8*4);
+ state->length = 0;
+ memcpy_P(state->h, sha256_init_vector, 8 * 4);
}
/*************************************************************************/
* rotate x right by n positions
*/
uint32_t rotr32( uint32_t x, uint8_t n){
- return ((x>>n) | (x<<(32-n)));
+ return ((x >> n) | (x << (32 - n)));
}
// #define CHANGE_ENDIAN32(x) (((x)<<24) | ((x)>>24) | (((x)& 0x0000ff00)<<8) | (((x)& 0x00ff0000)>>8))
uint32_t change_endian32(uint32_t x){
- return (((x)<<24) | ((x)>>24) | (((x)& 0x0000ff00)<<8) | (((x)& 0x00ff0000)>>8));
+ return ( ((x) << 24)
+ | ((x) >> 24)
+ | (((x) & 0x0000ff00UL) << 8)
+ | (((x) & 0x00ff0000UL) >> 8) );
}
/* sha256 functions as macros for speed and size, cause they are called only once */
-#define CH(x,y,z) (((x)&(y)) ^ ((~(x))&(z)))
-#define MAJ(x,y,z) (((x)&(y)) ^ ((x)&(z)) ^ ((y)&(z)))
+#define CH(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
+#define MAJ(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
-#define SIGMA0(x) (rotr32((x),2) ^ rotr32((x),13) ^ rotr32((x),22))
-#define SIGMA1(x) (rotr32((x),6) ^ rotr32((x),11) ^ rotr32((x),25))
-#define SIGMA_a(x) (rotr32((x),7) ^ rotr32((x),18) ^ ((x)>>3))
-#define SIGMA_b(x) (rotr32((x),17) ^ rotr32((x),19) ^ ((x)>>10))
+#define SIGMA0(x) (rotr32((x), 2) ^ rotr32((x), 13) ^ rotr32((x), 22))
+#define SIGMA1(x) (rotr32((x), 6) ^ rotr32((x), 11) ^ rotr32((x), 25))
+#define SIGMA_a(x) (rotr32((x), 7) ^ rotr32((x), 18) ^ ((x) >> 3))
+#define SIGMA_b(x) (rotr32((x), 17) ^ rotr32((x), 19) ^ ((x) >> 10))
-uint32_t k[]={
- 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
- 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
- 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
- 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
- 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
- 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
- 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
- 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+static const uint32_t k[] PROGMEM = {
+ 0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL, 0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
+ 0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL, 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 0xc19bf174UL,
+ 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL, 0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL,
+ 0x983e5152UL, 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL, 0xc6e00bf3UL, 0xd5a79147UL, 0x06ca6351UL, 0x14292967UL,
+ 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 0x53380d13UL, 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
+ 0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL, 0xd192e819UL, 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL,
+ 0x19a4c116UL, 0x1e376c08UL, 0x2748774cUL, 0x34b0bcb5UL, 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 0x682e6ff3UL,
+ 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL, 0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
};
/*************************************************************************/
/**
- * block must be, 512, Bit = 64, Byte, long !!!
+ * block must be 512 Bit = 64 Byte long !!!
*/
void sha256_nextBlock (sha256_ctx_t *state, const void *block){
- uint32_t w[64]; /* this is 256, byte, large, */
+ uint32_t w[16]; /* this is 64 Byte large, */
uint8_t i;
- uint32_t a[8],t1,t2;
+ uint32_t a[8], t1, t2;
- /* init w */
+ /* init working variables */
+ memcpy((void*)a,(void*)(state->h), 8 * 4);
+
+ /* init w */
#if defined LITTLE_ENDIAN
- for (i=0; i<16; ++i){
- w[i]= change_endian32(((uint32_t*)block)[i]);
- }
+ for (i = 0; i < 16; ++i) {
+ w[i] = change_endian32(((uint32_t*)block)[i]);
+ }
#elif defined BIG_ENDIAN
memcpy((void*)w, block, 64);
#endif
- for (i=16; i<64; ++i){
- w[i] = SIGMA_b(w[i-2]) + w[i-7] + SIGMA_a(w[i-15]) + w[i-16];
- }
-
- /* init working variables */
- memcpy((void*)a,(void*)(state->h), 8*4);
-
+/*
+ for (i = 16; i < 64; ++i) {
+ w[i] = SIGMA_b(w[i - 2]) + w[i - 7] + SIGMA_a(w[i - 15]) + w[i - 16];
+ }
+*/
/* do the, fun stuff, */
- for (i=0; i<64; ++i){
- t1 = a[7] + SIGMA1(a[4]) + CH(a[4],a[5],a[6]) + k[i] + w[i];
- t2 = SIGMA0(a[0]) + MAJ(a[0],a[1],a[2]);
- memmove(&(a[1]), &(a[0]), 7*4); /* a[7]=a[6]; a[6]=a[5]; a[5]=a[4]; a[4]=a[3]; a[3]=a[2]; a[2]=a[1]; a[1]=a[0]; */
- a[4] += t1;
- a[0] = t1 + t2;
- }
+ for (i=0; i<64; ++i) {
+ if (i > 15) {
+ w[i % 16] = SIGMA_b(w[(i + 14) % 16])
+ + w[(i + 9) % 16]
+ + SIGMA_a(w[(i + 1) % 16])
+ + w[i % 16];
+ }
+ t1 = a[7] + SIGMA1(a[4]) + CH(a[4], a[5], a[6]) + pgm_read_dword(&k[i]) + w[i % 16];
+ t2 = SIGMA0(a[0]) + MAJ(a[0], a[1], a[2]);
+ memmove(&(a[1]), &(a[0]), 7 * 4); /* a[7]=a[6]; a[6]=a[5]; a[5]=a[4]; a[4]=a[3]; a[3]=a[2]; a[2]=a[1]; a[1]=a[0]; */
+ a[4] += t1;
+ a[0] = t1 + t2;
+ }
/* update, the, state, */
- for (i=0; i<8; ++i){
- state->h[i] += a[i];
- }
- state->length += 512;
+ for (i = 0; i < 8; ++i){
+ state->h[i] += a[i];
+ }
+ state->length += 1;
}
* if you have a message with bits at the end, the byte must be padded with zeros
*/
void sha256_lastBlock(sha256_ctx_t *state, const void *block, uint16_t length){
- uint8_t lb[SHA256_BLOCK_BITS/8]; /* local block */
+ uint8_t lb[SHA256_BLOCK_BITS / 8]; /* local block */
+ uint64_t msg_len;
while(length>=SHA256_BLOCK_BITS){
sha256_nextBlock(state, block);
length -= SHA256_BLOCK_BITS;
- block = (uint8_t*)block+SHA256_BLOCK_BYTES;
+ block = (uint8_t*)block + SHA256_BLOCK_BYTES;
}
- state->length += length;
- memcpy (&(lb[0]), block, length/8);
+ msg_len = state->length;
+ msg_len *= 512;
+ msg_len += length;
+ memcpy (&(lb[0]), block, length / 8);
/* set the final one bit */
- if (length & 0x7){ // if we have single bits at the end
- lb[length/8] = ((uint8_t*)(block))[length/8];
+ if (length & 7){ // if we have single bits at the end
+ lb[length / 8] = ((uint8_t*)(block))[length / 8];
} else {
- lb[length/8] = 0;
+ lb[length / 8] = 0;
}
- lb[length/8] |= 0x80>>(length & 0x7);
- length =(length >> 3) + 1; /* from now on length contains the number of BYTES in lb*/
+ lb[length / 8] |= 0x80 >> (length & 7);
+ length = (length / 8) + 1; /* from now on length contains the number of BYTES in lb*/
/* pad with zeros */
- if (length>64-8){ /* not enouth space for 64bit length value */
- memset((void*)(&(lb[length])), 0, 64-length);
+ if (length > 64 - 8){ /* not enouth space for 64bit length value */
+ memset((void*)(&(lb[length])), 0, 64 - length);
sha256_nextBlock(state, lb);
- state->length -= 512;
length = 0;
}
- memset((void*)(&(lb[length])), 0, 56-length);
+ memset((void*)(&(lb[length])), 0, 56 - length);
/* store the 64bit length value */
#if defined LITTLE_ENDIAN
- /* this is now rolled up */
- uint8_t i;
- for (i=1; i<=8; ++i){
- lb[55+i] = (uint8_t)(state->length>>(64- 8*i));
- }
+ /* this is now rolled up */
+ uint8_t i = 7;
+ do {
+ lb[56 + i] = msg_len & 0xff;
+ msg_len >>= 8;
+ } while (i--);
#elif defined BIG_ENDIAN
*((uint64_t)&(lb[56])) = state->length;
#endif
void sha256_ctx2hash(sha256_hash_t *dest, const sha256_ctx_t *state){
#if defined LITTLE_ENDIAN
uint8_t i;
- for(i=0; i<8; ++i){
+ for(i = 0; i < 8; ++i){
((uint32_t*)dest)[i] = change_endian32(state->h[i]);
}
#elif BIG_ENDIAN
projects / avr-crypto-lib.git / blobdiff