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/* 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]);