hash.h

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#ifndef BASE_HASH_H
#define BASE_HASH_H
 
#include <cstddef> // size_t
 
enum
{
    SHA256_DIGEST_LENGTH = 256 / 8,
    SHA256_MAXSTRSIZE = 2 * SHA256_DIGEST_LENGTH + 1,
    MD5_DIGEST_LENGTH = 128 / 8,
    MD5_MAXSTRSIZE = 2 * MD5_DIGEST_LENGTH + 1,
};
 
struct SHA256_DIGEST
{
    unsigned char data[SHA256_DIGEST_LENGTH];
};
 
struct MD5_DIGEST
{
    unsigned char data[MD5_DIGEST_LENGTH];
};
 
SHA256_DIGEST sha256(const void *message, size_t message_len);
void sha256_str(SHA256_DIGEST digest, char *str, size_t max_len);
int sha256_from_str(SHA256_DIGEST *out, const char *str);
int sha256_comp(SHA256_DIGEST digest1, SHA256_DIGEST digest2);
 
MD5_DIGEST md5(const void *message, size_t message_len);
void md5_str(MD5_DIGEST digest, char *str, size_t max_len);
int md5_from_str(MD5_DIGEST *out, const char *str);
int md5_comp(MD5_DIGEST digest1, MD5_DIGEST digest2);
 
extern const SHA256_DIGEST SHA256_ZEROED;
 
inline bool operator==(const SHA256_DIGEST &that, const SHA256_DIGEST &other)
{
    return sha256_comp(that, other) == 0;
}
inline bool operator!=(const SHA256_DIGEST &that, const SHA256_DIGEST &other)
{
    return !(that == other);
}
inline bool operator==(const MD5_DIGEST &that, const MD5_DIGEST &other)
{
    return md5_comp(that, other) == 0;
}
inline bool operator!=(const MD5_DIGEST &that, const MD5_DIGEST &other)
{
    return !(that == other);
}
 
#endif // BASE_HASH_H