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sha256.c
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sha256.c
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#include "sha256.h"
/* https://github.com/983/SHA-256 */
static inline uint32_t rotr(uint32_t x, int n){
return (x >> n) | (x << (32 - n));
}
static inline uint32_t step1(uint32_t e, uint32_t f, uint32_t g){
return (rotr(e, 6) ^ rotr(e, 11) ^ rotr(e, 25)) + ((e & f) ^ ((~ e) & g));
}
static inline uint32_t step2(uint32_t a, uint32_t b, uint32_t c){
return (rotr(a, 2) ^ rotr(a, 13) ^ rotr(a, 22)) + ((a & b) ^ (a & c) ^ (b & c));
}
static inline void update_w(uint32_t *w, int i, const uint8_t *buffer){
int j;
for (j = 0; j < 16; j++){
if (i < 16){
w[j] =
((uint32_t)buffer[0] << 24) |
((uint32_t)buffer[1] << 16) |
((uint32_t)buffer[2] << 8) |
((uint32_t)buffer[3]);
buffer += 4;
}else{
uint32_t a = w[(j + 1) & 15];
uint32_t b = w[(j + 14) & 15];
uint32_t s0 = (rotr(a, 7) ^ rotr(a, 18) ^ (a >> 3));
uint32_t s1 = (rotr(b, 17) ^ rotr(b, 19) ^ (b >> 10));
w[j] += w[(j + 9) & 15] + s0 + s1;
}
}
}
static void sha256_block(struct sha256 *sha){
uint32_t *state = sha->state;
static const uint32_t k[8 * 8] = {
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,
};
uint32_t a = state[0];
uint32_t b = state[1];
uint32_t c = state[2];
uint32_t d = state[3];
uint32_t e = state[4];
uint32_t f = state[5];
uint32_t g = state[6];
uint32_t h = state[7];
uint32_t w[16];
int i, j;
for (i = 0; i < 64; i += 16){
update_w(w, i, sha->buffer);
for (j = 0; j < 16; j += 4){
uint32_t temp;
temp = h + step1(e, f, g) + k[i + j + 0] + w[j + 0];
h = temp + d;
d = temp + step2(a, b, c);
temp = g + step1(h, e, f) + k[i + j + 1] + w[j + 1];
g = temp + c;
c = temp + step2(d, a, b);
temp = f + step1(g, h, e) + k[i + j + 2] + w[j + 2];
f = temp + b;
b = temp + step2(c, d, a);
temp = e + step1(f, g, h) + k[i + j + 3] + w[j + 3];
e = temp + a;
a = temp + step2(b, c, d);
}
}
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
state[5] += f;
state[6] += g;
state[7] += h;
}
void sha256_init(struct sha256 *sha){
sha->state[0] = 0x6a09e667;
sha->state[1] = 0xbb67ae85;
sha->state[2] = 0x3c6ef372;
sha->state[3] = 0xa54ff53a;
sha->state[4] = 0x510e527f;
sha->state[5] = 0x9b05688c;
sha->state[6] = 0x1f83d9ab;
sha->state[7] = 0x5be0cd19;
sha->n_bits = 0;
sha->buffer_counter = 0;
}
void sha256_append_byte(struct sha256 *sha, uint8_t byte){
sha->buffer[sha->buffer_counter++] = byte;
sha->n_bits += 8;
if (sha->buffer_counter == 64){
sha->buffer_counter = 0;
sha256_block(sha);
}
}
void sha256_append(struct sha256 *sha, const void *src, size_t n_bytes){
const uint8_t *bytes = (const uint8_t*)src;
size_t i;
for (i = 0; i < n_bytes; i++){
sha256_append_byte(sha, bytes[i]);
}
}
void sha256_finalize(struct sha256 *sha){
int i;
uint64_t n_bits = sha->n_bits;
sha256_append_byte(sha, 0x80);
while (sha->buffer_counter != 56){
sha256_append_byte(sha, 0);
}
for (i = 7; i >= 0; i--){
uint8_t byte = (n_bits >> 8 * i) & 0xff;
sha256_append_byte(sha, byte);
}
}
void sha256_finalize_hex(struct sha256 *sha, char *dst_hex65){
int i, j;
sha256_finalize(sha);
for (i = 0; i < 8; i++){
for (j = 7; j >= 0; j--){
uint8_t nibble = (sha->state[i] >> j * 4) & 0xf;
*dst_hex65++ = "0123456789abcdef"[nibble];
}
}
*dst_hex65 = '\0';
}
void sha256_finalize_bytes(struct sha256 *sha, void *dst_bytes32){
uint8_t *ptr = (uint8_t*)dst_bytes32;
int i, j;
sha256_finalize(sha);
for (i = 0; i < 8; i++){
for (j = 3; j >= 0; j--){
*ptr++ = (sha->state[i] >> j * 8) & 0xff;
}
}
}
void sha256_hex(const void *src, size_t n_bytes, char *dst_hex65){
struct sha256 sha;
sha256_init(&sha);
sha256_append(&sha, src, n_bytes);
sha256_finalize_hex(&sha, dst_hex65);
}
void sha256_bytes(const void *src, size_t n_bytes, void *dst_bytes32){
struct sha256 sha;
sha256_init(&sha);
sha256_append(&sha, src, n_bytes);
sha256_finalize_bytes(&sha, dst_bytes32);
}