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99 lines
4.0 KiB
C
99 lines
4.0 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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/*
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* Note: encrypt and decrypt expect full blocks--padding blocks is caller's
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* responsibility. All bulk encryption is done in ECB mode by these calls.
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* Other modes may be added easily enough.
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*/
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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,
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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,
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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,
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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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/*
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* Compute MAC of given length in bits from data, using non-zero 8-byte IV
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* (non-standard, for use in CryptoPro key transport only
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*/
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int gost_mac_iv(gost_ctx * ctx, int hmac_len, const unsigned char *iv,
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const unsigned char *data, unsigned int data_len,
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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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typedef unsigned int word32;
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#endif
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