gcm.h

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#ifndef MBEDTLS_GCM_H
#define MBEDTLS_GCM_H

#include "cipher.h"

#include <stdint.h>

#define MBEDTLS_GCM_ENCRYPT 1
#define MBEDTLS_GCM_DECRYPT 0

#define MBEDTLS_ERR_GCM_AUTH_FAILED -0x0012 
#define MBEDTLS_ERR_GCM_BAD_INPUT -0x0014 
#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
 mbedtls_cipher_context_t cipher_ctx;
 uint64_t HL[16]; 
 uint64_t HH[16]; 
 uint64_t len; 
 uint64_t add_len; 
 unsigned char base_ectr[16];
 unsigned char y[16]; 
 unsigned char buf[16]; 
 int mode; 
}
mbedtls_gcm_context;

void mbedtls_gcm_init( mbedtls_gcm_context *ctx );

int mbedtls_gcm_setkey( mbedtls_gcm_context *ctx,
 mbedtls_cipher_id_t cipher,
 const unsigned char *key,
 unsigned int keybits );

int mbedtls_gcm_crypt_and_tag( mbedtls_gcm_context *ctx,
 int mode,
 size_t length,
 const unsigned char *iv,
 size_t iv_len,
 const unsigned char *add,
 size_t add_len,
 const unsigned char *input,
 unsigned char *output,
 size_t tag_len,
 unsigned char *tag );

int mbedtls_gcm_auth_decrypt( mbedtls_gcm_context *ctx,
 size_t length,
 const unsigned char *iv,
 size_t iv_len,
 const unsigned char *add,
 size_t add_len,
 const unsigned char *tag,
 size_t tag_len,
 const unsigned char *input,
 unsigned char *output );

int mbedtls_gcm_starts( mbedtls_gcm_context *ctx,
 int mode,
 const unsigned char *iv,
 size_t iv_len,
 const unsigned char *add,
 size_t add_len );

int mbedtls_gcm_update( mbedtls_gcm_context *ctx,
 size_t length,
 const unsigned char *input,
 unsigned char *output );

int mbedtls_gcm_finish( mbedtls_gcm_context *ctx,
 unsigned char *tag,
 size_t tag_len );

void mbedtls_gcm_free( mbedtls_gcm_context *ctx );

int mbedtls_gcm_self_test( int verbose );

#ifdef __cplusplus
}
#endif

#endif /* gcm.h */