1 /**********************************************************************
3 * Copyright (c) 2005-2006 Cryptocom LTD *
4 * This file is distributed under the same license as OpenSSL *
6 * Declarations for GOST 28147-89 encryption algorithm *
7 * No OpenSSL libraries required to compile and use *
9 **********************************************************************/
13 /* Typedef for unsigned 32-bit integer */
14 #if __LONG_MAX__ > 2147483647L
15 typedef unsigned int u4;
17 typedef unsigned long u4;
19 /* Typedef for unsigned 8-bit integer */
20 typedef unsigned char byte;
22 /* Internal representation of GOST substitution blocks */
35 /* Cipher context includes key and preprocessed substitution block */
38 /* Constant s-boxes -- set up in gost_init(). */
39 u4 k87[256],k65[256],k43[256],k21[256];
41 /* Note: encrypt and decrypt expect full blocks--padding blocks is
42 caller's responsibility. All bulk encryption is done in
43 ECB mode by these calls. Other modes may be added easily
45 /* Encrypt several full blocks in ECB mode */
46 void gost_enc(gost_ctx *ctx, const byte *clear,byte *cipher, int blocks);
47 /* Decrypt several full blocks in ECB mode */
48 void gost_dec(gost_ctx *ctx, const byte *cipher,byte *clear, int blocks);
49 /* Encrypts several full blocks in CFB mode using 8byte IV */
50 void gost_enc_cfb(gost_ctx *ctx,const byte *iv,const byte *clear,byte *cipher,int blocks);
51 /* Decrypts several full blocks in CFB mode using 8byte IV */
52 void gost_dec_cfb(gost_ctx *ctx,const byte *iv,const byte *cipher,byte *clear,int blocks);
54 /* Encrypt one block */
55 void gostcrypt(gost_ctx *c, const byte *in, byte *out);
56 /* Decrypt one block */
57 void gostdecrypt(gost_ctx *c, const byte *in,byte *out);
58 /* Set key into context */
59 void gost_key(gost_ctx *ctx, const byte *key);
60 /* Get key from context */
61 void gost_get_key(gost_ctx *ctx, byte *key);
62 /* Set S-blocks into context */
63 void gost_init(gost_ctx *ctx, const gost_subst_block *subst_block);
64 /* Clean up context */
65 void gost_destroy(gost_ctx *ctx);
66 /* Intermediate function used for calculate hash */
67 void gost_enc_with_key(gost_ctx *,byte *key,byte *inblock,byte *outblock);
68 /* Compute MAC of given length in bits from data */
69 int gost_mac(gost_ctx *ctx,int hmac_len,const unsigned char *data,
70 unsigned int data_len,unsigned char *hmac) ;
71 /* Compute MAC of given length in bits from data, using non-zero 8-byte
72 * IV (non-standard, for use in CryptoPro key transport only */
73 int gost_mac_iv(gost_ctx *ctx,int hmac_len,const unsigned char *iv,const unsigned char *data,
74 unsigned int data_len,unsigned char *hmac) ;
75 /* Perform one step of MAC calculation like gostcrypt */
76 void mac_block(gost_ctx *c,byte *buffer,const byte *block);
77 /* Extracts MAC value from mac state buffer */
78 void get_mac(byte *buffer,int nbits,byte *out);
79 /* Implements cryptopro key meshing algorithm. Expect IV to be 8-byte size*/
80 void cryptopro_key_meshing(gost_ctx *ctx, unsigned char *iv);
81 /* Parameter sets specified in RFC 4357 */
82 extern gost_subst_block GostR3411_94_TestParamSet;
83 extern gost_subst_block GostR3411_94_CryptoProParamSet;
84 extern gost_subst_block Gost28147_TestParamSet;
85 extern gost_subst_block Gost28147_CryptoProParamSetA;
86 extern gost_subst_block Gost28147_CryptoProParamSetB;
87 extern gost_subst_block Gost28147_CryptoProParamSetC;
88 extern gost_subst_block Gost28147_CryptoProParamSetD;
89 extern const byte CryptoProKeyMeshingKey[];
90 typedef unsigned int word32;