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