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/**********************************************************************
* gost89.h *
* Copyright (c) 2005-2006 Cryptocom LTD *
* This file is distributed under the same license as OpenSSL *
* *
* Declarations for GOST 28147-89 encryption algorithm *
* No OpenSSL libraries required to compile and use *
* this code *
**********************************************************************/
#ifndef GOST89_H
#define GOST89_H
/* Typedef for unsigned 32-bit integer */
#if __LONG_MAX__ > 2147483647L
typedef unsigned int u4;
#else
typedef unsigned long u4;
#endif
/* Typedef for unsigned 8-bit integer */
typedef unsigned char byte;
/* Internal representation of GOST substitution blocks */
typedef struct {
byte k8[16];
byte k7[16];
byte k6[16];
byte k5[16];
byte k4[16];
byte k3[16];
byte k2[16];
byte k1[16];
} gost_subst_block;
/* Cipher context includes key and preprocessed substitution block */
typedef struct {
u4 k[8];
/* Constant s-boxes -- set up in gost_init(). */
u4 k87[256],k65[256],k43[256],k21[256];
} gost_ctx;
/* Note: encrypt and decrypt expect full blocks--padding blocks is
caller's responsibility. All bulk encryption is done in
ECB mode by these calls. Other modes may be added easily
enough. */
/* Encrypt several full blocks in ECB mode */
void gost_enc(gost_ctx *ctx, const byte *clear,byte *cipher, int blocks);
/* Decrypt several full blocks in ECB mode */
void gost_dec(gost_ctx *ctx, const byte *cipher,byte *clear, int blocks);
/* Encrypts several full blocks in CFB mode using 8byte IV */
void gost_enc_cfb(gost_ctx *ctx,const byte *iv,const byte *clear,byte *cipher,int blocks);
/* Decrypts several full blocks in CFB mode using 8byte IV */
void gost_dec_cfb(gost_ctx *ctx,const byte *iv,const byte *cipher,byte *clear,int blocks);
/* Encrypt one block */
void gostcrypt(gost_ctx *c, const byte *in, byte *out);
/* Decrypt one block */
void gostdecrypt(gost_ctx *c, const byte *in,byte *out);
/* Set key into context */
void gost_key(gost_ctx *ctx, const byte *key);
/* Get key from context */
void gost_get_key(gost_ctx *ctx, byte *key);
/* Set S-blocks into context */
void gost_init(gost_ctx *ctx, const gost_subst_block *subst_block);
/* Clean up context */
void gost_destroy(gost_ctx *ctx);
/* Intermediate function used for calculate hash */
void gost_enc_with_key(gost_ctx *,byte *key,byte *inblock,byte *outblock);
/* Compute MAC of given length in bits from data */
int gost_mac(gost_ctx *ctx,int hmac_len,const unsigned char *data,
unsigned int data_len,unsigned char *hmac) ;
/* Compute MAC of given length in bits from data, using non-zero 8-byte
* IV (non-standard, for use in CryptoPro key transport only */
int gost_mac_iv(gost_ctx *ctx,int hmac_len,const unsigned char *iv,const unsigned char *data,
unsigned int data_len,unsigned char *hmac) ;
/* Perform one step of MAC calculation like gostcrypt */
void mac_block(gost_ctx *c,byte *buffer,const byte *block);
/* Extracts MAC value from mac state buffer */
void get_mac(byte *buffer,int nbits,byte *out);
/* Implements cryptopro key meshing algorithm. Expect IV to be 8-byte size*/
void cryptopro_key_meshing(gost_ctx *ctx, unsigned char *iv);
/* Parameter sets specified in RFC 4357 */
extern gost_subst_block GostR3411_94_TestParamSet;
extern gost_subst_block GostR3411_94_CryptoProParamSet;
extern gost_subst_block Gost28147_TestParamSet;
extern gost_subst_block Gost28147_CryptoProParamSetA;
extern gost_subst_block Gost28147_CryptoProParamSetB;
extern gost_subst_block Gost28147_CryptoProParamSetC;
extern gost_subst_block Gost28147_CryptoProParamSetD;
extern const byte CryptoProKeyMeshingKey[];
#if __LONG_MAX__ > 2147483647L
typedef unsigned int word32;
#else
typedef unsigned long word32;
#endif
#endif
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