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	sha256.h - sbase - suckless unix tools
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	sha256.h (615B)
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	1 /* public domain sha256 implementation based on fips180-3 */
	2
	3 struct sha256 {
	4 uint64_t len; /* processed message length */
	5 uint32_t h[8]; /* hash state */
	6 uint8_t buf[64]; /* message block buffer */
	7 };
	8
	9 enum { SHA256_DIGEST_LENGTH = 32 };
	10
	11 /* reset state */
	12 void sha256_init(void *ctx);
	13 /* process message */
	14 void sha256_update(void ctx, const void m, unsigned long len);
	15 /* get message digest */
	16 /* state is ruined after sum, keep a copy if multiple sum is needed */
	17 /* part of the message might be left in s, zero it if secrecy is needed …
	18 void sha256_sum(void *ctx, uint8_t md[SHA256_DIGEST_LENGTH]);