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2166d7e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | #ifndef CS_SHA256_H
#define CS_SHA256_H
#include <stddef.h>
#include <stdint.h>
#define CS_SHA256_LEN 32
typedef struct cs_sha256_ctx {
uint32_t h[8];
uint64_t total;
uint8_t buf[64];
size_t n;
} cs_sha256_ctx;
void cs_sha256_init(cs_sha256_ctx *c);
void cs_sha256_update(cs_sha256_ctx *c, const void *data, size_t len);
void cs_sha256_final(cs_sha256_ctx *c, uint8_t out[CS_SHA256_LEN]);
void cs_sha256(const void *data, size_t len, uint8_t out[CS_SHA256_LEN]);
void cs_hmac_sha256(const void *key, size_t klen, const void *msg, size_t mlen,
uint8_t out[CS_SHA256_LEN]);
/* big-endian helpers for canonical serialization */
void cs_sha256_update_u64(cs_sha256_ctx *c, uint64_t v);
/* constant-time comparison; returns 1 if equal */
int cs_ct_equal(const void *a, const void *b, size_t n);
/* out must hold 2*n+1 bytes */
void cs_hex(const uint8_t *in, size_t n, char *out);
/* returns 0 on success; hex must be exactly 2*n digits */
int cs_unhex(const char *hex, uint8_t *out, size_t n);
#endif
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