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 */