gcm.h

Go to the documentation of this file.

 
#ifndef POLARSSL_GCM_H
#define POLARSSL_GCM_H
 
#include "cipher.h"
 
#if defined(_MSC_VER) && !defined(EFIX64) && !defined(EFI32)
#include <basetsd.h>
typedef UINT32 uint32_t;
typedef UINT64 uint64_t;
#else
#include <stdint.h>
#endif
 
#define GCM_ENCRYPT     1
#define GCM_DECRYPT     0
 
#define POLARSSL_ERR_GCM_AUTH_FAILED                       -0x0012  
#define POLARSSL_ERR_GCM_BAD_INPUT                         -0x0014  
#ifdef __cplusplus
extern "C" {
#endif
 
typedef struct {
    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;                   
}
gcm_context;
 
int gcm_init( gcm_context *ctx, cipher_id_t cipher, const unsigned char *key,
              unsigned int keysize );
 
int gcm_crypt_and_tag( 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 gcm_auth_decrypt( 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 gcm_starts( gcm_context *ctx,
                int mode,
                const unsigned char *iv,
                size_t iv_len,
                const unsigned char *add,
                size_t add_len );
 
int gcm_update( gcm_context *ctx,
                size_t length,
                const unsigned char *input,
                unsigned char *output );
 
int gcm_finish( gcm_context *ctx,
                unsigned char *tag,
                size_t tag_len );
 
void gcm_free( gcm_context *ctx );
 
int gcm_self_test( int verbose );
 
#ifdef __cplusplus
}
#endif
 
#endif /* gcm.h */