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      1 #ifndef crypto_hash_sha256_H
      2 #define crypto_hash_sha256_H
      3 
      4 /*
      5  * WARNING: Unless you absolutely need to use SHA256 for interoperatibility,
      6  * purposes, you might want to consider crypto_generichash() instead.
      7  * Unlike SHA256, crypto_generichash() is not vulnerable to length
      8  * extension attacks.
      9  */
     10 
     11 #include <stddef.h>
     12 #include <stdint.h>
     13 #include <stdlib.h>
     14 
     15 #include "export.h"
     16 
     17 #ifdef __cplusplus
     18 # ifdef __GNUC__
     19 #  pragma GCC diagnostic ignored "-Wlong-long"
     20 # endif
     21 extern "C" {
     22 #endif
     23 
     24 typedef struct crypto_hash_sha256_state {
     25     uint32_t state[8];
     26     uint64_t count;
     27     uint8_t  buf[64];
     28 } crypto_hash_sha256_state;
     29 
     30 SODIUM_EXPORT
     31 size_t crypto_hash_sha256_statebytes(void);
     32 
     33 #define crypto_hash_sha256_BYTES 32U
     34 SODIUM_EXPORT
     35 size_t crypto_hash_sha256_bytes(void);
     36 
     37 SODIUM_EXPORT
     38 int crypto_hash_sha256(unsigned char *out, const unsigned char *in,
     39                        unsigned long long inlen);
     40 
     41 SODIUM_EXPORT
     42 int crypto_hash_sha256_init(crypto_hash_sha256_state *state);
     43 
     44 SODIUM_EXPORT
     45 int crypto_hash_sha256_update(crypto_hash_sha256_state *state,
     46                               const unsigned char *in,
     47                               unsigned long long inlen);
     48 
     49 SODIUM_EXPORT
     50 int crypto_hash_sha256_final(crypto_hash_sha256_state *state,
     51                              unsigned char *out);
     52 
     53 #ifdef __cplusplus
     54 }
     55 #endif
     56 
     57 #endif
     58