| /* public domain sha256 implementation based on fips180-3 */ |
| |
| struct sha256 { |
| uint64_t len; /* processed message length */ |
| uint32_t h[8]; /* hash state */ |
| uint8_t buf[64]; /* message block buffer */ |
| }; |
| |
| enum { SHA256_DIGEST_LENGTH = 32 }; |
| |
| /* reset state */ |
| void sha256_init(void *ctx); |
| /* process message */ |
| void sha256_update(void *ctx, const void *m, unsigned long len); |
| /* get message digest */ |
| /* state is ruined after sum, keep a copy if multiple sum is needed */ |
| /* part of the message might be left in s, zero it if secrecy is needed */ |
| void sha256_sum(void *ctx, uint8_t md[SHA256_DIGEST_LENGTH]); |