1 #ifndef _SHA256_H
2 #define _SHA256_H
3 
4 #define SHA256_SUM_LEN	32
5 #define SHA256_DER_LEN	19
6 
7 extern const uint8_t sha256_der_prefix[];
8 
9 /* Reset watchdog each time we process this many bytes */
10 #define CHUNKSZ_SHA256	(64 * 1024)
11 
12 typedef struct {
13 	uint32_t total[2];
14 	uint32_t state[8];
15 	uint8_t buffer[64];
16 } sha256_context;
17 
18 void sha256_starts(sha256_context * ctx);
19 void sha256_update(sha256_context *ctx, const uint8_t *input, uint32_t length);
20 void sha256_finish(sha256_context * ctx, uint8_t digest[SHA256_SUM_LEN]);
21 
22 void sha256_csum_wd(const unsigned char *input, unsigned int ilen,
23 		unsigned char *output, unsigned int chunk_sz);
24 
25 #endif /* _SHA256_H */
26