/* sha256.h — minimal public-domain SHA-256 context/API for MeowOS .mpk payload hashing.
 * Used by meow_verify (device) and meow_sign (host) to compute .mpk 的 payload_sha256
 * (tar.gz 前缀哈希)。流式 API，避免整包载入内存。 */
#ifndef MEOW_SHA256_H
#define MEOW_SHA256_H

#include <stddef.h>
#include <stdint.h>

typedef struct {
    uint32_t state[8];
    uint64_t count;      /* 已输入总字节数 */
    uint8_t  buf[64];    /* 未满一块的缓冲 */
    size_t   buflen;
} meow_sha256_ctx;

void meow_sha256_init(meow_sha256_ctx *c);
void meow_sha256_update(meow_sha256_ctx *c, const uint8_t *data, size_t len);
void meow_sha256_final(meow_sha256_ctx *c, uint8_t out[32]);

#endif /* MEOW_SHA256_H */