md.h

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#ifndef MBEDTLS_MD_H
#define MBEDTLS_MD_H

#include <stddef.h>

#define MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE                -0x5080  
#define MBEDTLS_ERR_MD_BAD_INPUT_DATA                     -0x5100  
#define MBEDTLS_ERR_MD_ALLOC_FAILED                       -0x5180  
#define MBEDTLS_ERR_MD_FILE_IO_ERROR                      -0x5200  
#ifdef __cplusplus
extern "C" {
#endif

typedef enum {
    MBEDTLS_MD_NONE=0,
    MBEDTLS_MD_MD2,
    MBEDTLS_MD_MD4,
    MBEDTLS_MD_MD5,
    MBEDTLS_MD_SHA1,
    MBEDTLS_MD_SHA224,
    MBEDTLS_MD_SHA256,
    MBEDTLS_MD_SHA384,
    MBEDTLS_MD_SHA512,
    MBEDTLS_MD_RIPEMD160,
} mbedtls_md_type_t;

#if defined(MBEDTLS_SHA512_C)
#define MBEDTLS_MD_MAX_SIZE         64  /* longest known is SHA512 */
#else
#define MBEDTLS_MD_MAX_SIZE         32  /* longest known is SHA256 or less */
#endif

typedef struct mbedtls_md_info_t mbedtls_md_info_t;

typedef struct {
    const mbedtls_md_info_t *md_info;

    void *md_ctx;

    void *hmac_ctx;
} mbedtls_md_context_t;

const int *mbedtls_md_list( void );

const mbedtls_md_info_t *mbedtls_md_info_from_string( const char *md_name );

const mbedtls_md_info_t *mbedtls_md_info_from_type( mbedtls_md_type_t md_type );

void mbedtls_md_init( mbedtls_md_context_t *ctx );

void mbedtls_md_free( mbedtls_md_context_t *ctx );

#if ! defined(MBEDTLS_DEPRECATED_REMOVED)
#if defined(MBEDTLS_DEPRECATED_WARNING)
#define MBEDTLS_DEPRECATED    __attribute__((deprecated))
#else
#define MBEDTLS_DEPRECATED
#endif

int mbedtls_md_init_ctx( mbedtls_md_context_t *ctx, const mbedtls_md_info_t *md_info ) MBEDTLS_DEPRECATED;
#undef MBEDTLS_DEPRECATED
#endif /* MBEDTLS_DEPRECATED_REMOVED */

int mbedtls_md_setup( mbedtls_md_context_t *ctx, const mbedtls_md_info_t *md_info, int hmac );

int mbedtls_md_clone( mbedtls_md_context_t *dst,
                      const mbedtls_md_context_t *src );

unsigned char mbedtls_md_get_size( const mbedtls_md_info_t *md_info );

mbedtls_md_type_t mbedtls_md_get_type( const mbedtls_md_info_t *md_info );

const char *mbedtls_md_get_name( const mbedtls_md_info_t *md_info );

int mbedtls_md_starts( mbedtls_md_context_t *ctx );

int mbedtls_md_update( mbedtls_md_context_t *ctx, const unsigned char *input, size_t ilen );

int mbedtls_md_finish( mbedtls_md_context_t *ctx, unsigned char *output );

int mbedtls_md( const mbedtls_md_info_t *md_info, const unsigned char *input, size_t ilen,
        unsigned char *output );

#if defined(MBEDTLS_FS_IO)

int mbedtls_md_file( const mbedtls_md_info_t *md_info, const char *path,
                     unsigned char *output );
#endif /* MBEDTLS_FS_IO */

int mbedtls_md_hmac_starts( mbedtls_md_context_t *ctx, const unsigned char *key,
                    size_t keylen );

int mbedtls_md_hmac_update( mbedtls_md_context_t *ctx, const unsigned char *input,
                    size_t ilen );

int mbedtls_md_hmac_finish( mbedtls_md_context_t *ctx, unsigned char *output);

int mbedtls_md_hmac_reset( mbedtls_md_context_t *ctx );

int mbedtls_md_hmac( const mbedtls_md_info_t *md_info, const unsigned char *key, size_t keylen,
                const unsigned char *input, size_t ilen,
                unsigned char *output );

/* Internal use */
int mbedtls_md_process( mbedtls_md_context_t *ctx, const unsigned char *data );

#ifdef __cplusplus
}
#endif

#endif /* MBEDTLS_MD_H */