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openssl/engines/ccgost/gost89.c

+/**********************************************************************
+ *                        gost89.c                                    *
+ *             Copyright (c) 2005-2006 Cryptocom LTD                  *
+ *         This file is distributed under the same license as OpenSSL *
+ *                                                                    *
+ *          Implementation of GOST 28147-89 encryption algorithm      *
+ *            No OpenSSL libraries required to compile and use        *
+ *                              this code                             *
+ **********************************************************************/ 
+#include <string.h>
+#include "gost89.h"
+/* Substitution blocks from RFC 4357 
+   
+   Note: our implementation of gost 28147-89 algorithm 
+   uses S-box matrix rotated 90 degrees counterclockwise, relative to 
+   examples given in RFC.
+  
+
+*/
+
+/* Substitution blocks from test examples for GOST R 34.11-94*/
+gost_subst_block GostR3411_94_TestParamSet = {
+        {0X1,0XF,0XD,0X0,0X5,0X7,0XA,0X4,0X9,0X2,0X3,0XE,0X6,0XB,0X8,0XC},
+        {0XD,0XB,0X4,0X1,0X3,0XF,0X5,0X9,0X0,0XA,0XE,0X7,0X6,0X8,0X2,0XC},
+        {0X4,0XB,0XA,0X0,0X7,0X2,0X1,0XD,0X3,0X6,0X8,0X5,0X9,0XC,0XF,0XE},
+        {0X6,0XC,0X7,0X1,0X5,0XF,0XD,0X8,0X4,0XA,0X9,0XE,0X0,0X3,0XB,0X2},
+        {0X7,0XD,0XA,0X1,0X0,0X8,0X9,0XF,0XE,0X4,0X6,0XC,0XB,0X2,0X5,0X3},
+        {0X5,0X8,0X1,0XD,0XA,0X3,0X4,0X2,0XE,0XF,0XC,0X7,0X6,0X0,0X9,0XB},
+        {0XE,0XB,0X4,0XC,0X6,0XD,0XF,0XA,0X2,0X3,0X8,0X1,0X0,0X7,0X5,0X9},
+        {0X4,0XA,0X9,0X2,0XD,0X8,0X0,0XE,0X6,0XB,0X1,0XC,0X7,0XF,0X5,0X3}
+        };  
+/* Substitution blocks for hash function 1.2.643.2.9.1.6.1  */
+gost_subst_block GostR3411_94_CryptoProParamSet= {
+        {0x1,0x3,0xA,0x9,0x5,0xB,0x4,0xF,0x8,0x6,0x7,0xE,0xD,0x0,0x2,0xC},
+        {0xD,0xE,0x4,0x1,0x7,0x0,0x5,0xA,0x3,0xC,0x8,0xF,0x6,0x2,0x9,0xB},
+        {0x7,0x6,0x2,0x4,0xD,0x9,0xF,0x0,0xA,0x1,0x5,0xB,0x8,0xE,0xC,0x3},
+        {0x7,0x6,0x4,0xB,0x9,0xC,0x2,0xA,0x1,0x8,0x0,0xE,0xF,0xD,0x3,0x5},
+        {0x4,0xA,0x7,0xC,0x0,0xF,0x2,0x8,0xE,0x1,0x6,0x5,0xD,0xB,0x9,0x3},
+        {0x7,0xF,0xC,0xE,0x9,0x4,0x1,0x0,0x3,0xB,0x5,0x2,0x6,0xA,0x8,0xD},
+        {0x5,0xF,0x4,0x0,0x2,0xD,0xB,0x9,0x1,0x7,0x6,0x3,0xC,0xE,0xA,0x8},
+        {0xA,0x4,0x5,0x6,0x8,0x1,0x3,0x7,0xD,0xC,0xE,0x0,0x9,0x2,0xB,0xF}
+        } ;
+
+/* Test paramset from GOST 28147 */
+gost_subst_block Gost28147_TestParamSet =
+        {
+        {0xC,0x6,0x5,0x2,0xB,0x0,0x9,0xD,0x3,0xE,0x7,0xA,0xF,0x4,0x1,0x8},
+        {0x9,0xB,0xC,0x0,0x3,0x6,0x7,0x5,0x4,0x8,0xE,0xF,0x1,0xA,0x2,0xD},
+        {0x8,0xF,0x6,0xB,0x1,0x9,0xC,0x5,0xD,0x3,0x7,0xA,0x0,0xE,0x2,0x4},
+        {0x3,0xE,0x5,0x9,0x6,0x8,0x0,0xD,0xA,0xB,0x7,0xC,0x2,0x1,0xF,0x4},
+        {0xE,0x9,0xB,0x2,0x5,0xF,0x7,0x1,0x0,0xD,0xC,0x6,0xA,0x4,0x3,0x8},
+        {0xD,0x8,0xE,0xC,0x7,0x3,0x9,0xA,0x1,0x5,0x2,0x4,0x6,0xF,0x0,0xB},
+        {0xC,0x9,0xF,0xE,0x8,0x1,0x3,0xA,0x2,0x7,0x4,0xD,0x6,0x0,0xB,0x5},
+        {0x4,0x2,0xF,0x5,0x9,0x1,0x0,0x8,0xE,0x3,0xB,0xC,0xD,0x7,0xA,0x6}
+        };
+
+
+
+
+/* 1.2.643.2.2.31.1 */
+gost_subst_block Gost28147_CryptoProParamSetA= {
+        {0xB,0xA,0xF,0x5,0x0,0xC,0xE,0x8,0x6,0x2,0x3,0x9,0x1,0x7,0xD,0x4},
+        {0x1,0xD,0x2,0x9,0x7,0xA,0x6,0x0,0x8,0xC,0x4,0x5,0xF,0x3,0xB,0xE},
+        {0x3,0xA,0xD,0xC,0x1,0x2,0x0,0xB,0x7,0x5,0x9,0x4,0x8,0xF,0xE,0x6},
+        {0xB,0x5,0x1,0x9,0x8,0xD,0xF,0x0,0xE,0x4,0x2,0x3,0xC,0x7,0xA,0x6},
+        {0xE,0x7,0xA,0xC,0xD,0x1,0x3,0x9,0x0,0x2,0xB,0x4,0xF,0x8,0x5,0x6},
+        {0xE,0x4,0x6,0x2,0xB,0x3,0xD,0x8,0xC,0xF,0x5,0xA,0x0,0x7,0x1,0x9},
+        {0x3,0x7,0xE,0x9,0x8,0xA,0xF,0x0,0x5,0x2,0x6,0xC,0xB,0x4,0xD,0x1},
+        {0x9,0x6,0x3,0x2,0x8,0xB,0x1,0x7,0xA,0x4,0xE,0xF,0xC,0x0,0xD,0x5}
+        };
+/* 1.2.643.2.2.31.2 */
+gost_subst_block Gost28147_CryptoProParamSetB= 
+        {
+        {0x0,0x4,0xB,0xE,0x8,0x3,0x7,0x1,0xA,0x2,0x9,0x6,0xF,0xD,0x5,0xC},
+        {0x5,0x2,0xA,0xB,0x9,0x1,0xC,0x3,0x7,0x4,0xD,0x0,0x6,0xF,0x8,0xE},
+        {0x8,0x3,0x2,0x6,0x4,0xD,0xE,0xB,0xC,0x1,0x7,0xF,0xA,0x0,0x9,0x5},
+        {0x2,0x7,0xC,0xF,0x9,0x5,0xA,0xB,0x1,0x4,0x0,0xD,0x6,0x8,0xE,0x3},
+        {0x7,0x5,0x0,0xD,0xB,0x6,0x1,0x2,0x3,0xA,0xC,0xF,0x4,0xE,0x9,0x8},
+        {0xE,0xC,0x0,0xA,0x9,0x2,0xD,0xB,0x7,0x5,0x8,0xF,0x3,0x6,0x1,0x4},
+        {0x0,0x1,0x2,0xA,0x4,0xD,0x5,0xC,0x9,0x7,0x3,0xF,0xB,0x8,0x6,0xE},
+        {0x8,0x4,0xB,0x1,0x3,0x5,0x0,0x9,0x2,0xE,0xA,0xC,0xD,0x6,0x7,0xF}
+        };
+/* 1.2.643.2.2.31.3 */
+gost_subst_block Gost28147_CryptoProParamSetC= 
+        {
+        {0x7,0x4,0x0,0x5,0xA,0x2,0xF,0xE,0xC,0x6,0x1,0xB,0xD,0x9,0x3,0x8},
+        {0xA,0x9,0x6,0x8,0xD,0xE,0x2,0x0,0xF,0x3,0x5,0xB,0x4,0x1,0xC,0x7},
+        {0xC,0x9,0xB,0x1,0x8,0xE,0x2,0x4,0x7,0x3,0x6,0x5,0xA,0x0,0xF,0xD},
+        {0x8,0xD,0xB,0x0,0x4,0x5,0x1,0x2,0x9,0x3,0xC,0xE,0x6,0xF,0xA,0x7},
+        {0x3,0x6,0x0,0x1,0x5,0xD,0xA,0x8,0xB,0x2,0x9,0x7,0xE,0xF,0xC,0x4},
+        {0x8,0x2,0x5,0x0,0x4,0x9,0xF,0xA,0x3,0x7,0xC,0xD,0x6,0xE,0x1,0xB},
+        {0x0,0x1,0x7,0xD,0xB,0x4,0x5,0x2,0x8,0xE,0xF,0xC,0x9,0xA,0x6,0x3},
+        {0x1,0xB,0xC,0x2,0x9,0xD,0x0,0xF,0x4,0x5,0x8,0xE,0xA,0x7,0x6,0x3}
+        };
+
+/* 1.2.643.2.2.31.4 */ 
+gost_subst_block Gost28147_CryptoProParamSetD=
+        {
+        {0x1,0xA,0x6,0x8,0xF,0xB,0x0,0x4,0xC,0x3,0x5,0x9,0x7,0xD,0x2,0xE},
+        {0x3,0x0,0x6,0xF,0x1,0xE,0x9,0x2,0xD,0x8,0xC,0x4,0xB,0xA,0x5,0x7},
+        {0x8,0x0,0xF,0x3,0x2,0x5,0xE,0xB,0x1,0xA,0x4,0x7,0xC,0x9,0xD,0x6},
+        {0x0,0xC,0x8,0x9,0xD,0x2,0xA,0xB,0x7,0x3,0x6,0x5,0x4,0xE,0xF,0x1},
+        {0x1,0x5,0xE,0xC,0xA,0x7,0x0,0xD,0x6,0x2,0xB,0x4,0x9,0x3,0xF,0x8},
+        {0x1,0xC,0xB,0x0,0xF,0xE,0x6,0x5,0xA,0xD,0x4,0x8,0x9,0x3,0x7,0x2},
+        {0xB,0x6,0x3,0x4,0xC,0xF,0xE,0x2,0x7,0xD,0x8,0x0,0x5,0xA,0x9,0x1},
+        {0xF,0xC,0x2,0xA,0x6,0x4,0x5,0x0,0x7,0x9,0xE,0xD,0x1,0xB,0x8,0x3}
+        };
+
+
+const byte CryptoProKeyMeshingKey[]={
+        0x69, 0x00, 0x72, 0x22,   0x64, 0xC9, 0x04, 0x23,
+    0x8D, 0x3A, 0xDB, 0x96,   0x46, 0xE9, 0x2A, 0xC4,
+    0x18, 0xFE, 0xAC, 0x94,   0x00, 0xED, 0x07, 0x12,
+    0xC0, 0x86, 0xDC, 0xC2,   0xEF, 0x4C, 0xA9, 0x2B
+        };      
+/* Initialization of gost_ctx subst blocks*/
+static void kboxinit(gost_ctx *c, const gost_subst_block *b)
+        { 
+        int i; 
+        
+        for (i = 0; i < 256; i++)
+                {
+                c->k87[i] = (b->k8[i>>4] <<4 | b->k7 [i &15])<<24;
+                c->k65[i] = (b->k6[i>>4] << 4 | b->k5 [i &15])<<16;
+                c->k43[i] = (b->k4[i>>4] <<4  | b->k3 [i &15])<<8;
+                c->k21[i] = b->k2[i>>4] <<4  | b->k1 [i &15];
+
+                }
+        }
+
+/* Part of GOST 28147 algorithm moved into separate function */
+static word32 f(gost_ctx *c,word32 x) 
+        {
+        x = c->k87[x>>24 & 255] | c->k65[x>>16 & 255]| 
+                c->k43[x>> 8 & 255] | c->k21[x & 255]; 
+        /* Rotate left 11 bits */ 
+        return x<<11 | x>>(32-11);
+        }
+/* Low-level encryption routine - encrypts one 64 bit block*/
+void gostcrypt(gost_ctx *c, const byte *in, byte *out)
+        { 
+        register word32 n1, n2; /* As named in the GOST */ 
+        n1 = in[0]|(in[1]<<8)|(in[2]<<16)|(in[3]<<24); 
+        n2 = in[4]|(in[5]<<8)|(in[6]<<16)|(in[7]<<24); 
+        /* Instead of swapping halves, swap names each round */ 
+         
+        n2 ^= f(c,n1+c->k[0]); n1 ^= f(c,n2+c->k[1]); 
+        n2 ^= f(c,n1+c->k[2]); n1 ^= f(c,n2+c->k[3]); 
+        n2 ^= f(c,n1+c->k[4]); n1 ^= f(c,n2+c->k[5]); 
+        n2 ^= f(c,n1+c->k[6]); n1 ^= f(c,n2+c->k[7]); 
+  
+        n2 ^= f(c,n1+c->k[0]); n1 ^= f(c,n2+c->k[1]);
+        n2 ^= f(c,n1+c->k[2]); n1 ^= f(c,n2+c->k[3]);
+        n2 ^= f(c,n1+c->k[4]); n1 ^= f(c,n2+c->k[5]);
+        n2 ^= f(c,n1+c->k[6]); n1 ^= f(c,n2+c->k[7]);
+                               
+        n2 ^= f(c,n1+c->k[0]); n1 ^= f(c,n2+c->k[1]);
+        n2 ^= f(c,n1+c->k[2]); n1 ^= f(c,n2+c->k[3]);
+        n2 ^= f(c,n1+c->k[4]); n1 ^= f(c,n2+c->k[5]);
+        n2 ^= f(c,n1+c->k[6]); n1 ^= f(c,n2+c->k[7]);
+                               
+        n2 ^= f(c,n1+c->k[7]); n1 ^= f(c,n2+c->k[6]);
+        n2 ^= f(c,n1+c->k[5]); n1 ^= f(c,n2+c->k[4]);
+        n2 ^= f(c,n1+c->k[3]); n1 ^= f(c,n2+c->k[2]);
+        n2 ^= f(c,n1+c->k[1]); n1 ^= f(c,n2+c->k[0]);
+ 
+        out[0] = (byte)(n2&0xff);  out[1] = (byte)((n2>>8)&0xff);
+        out[2] = (byte)((n2>>16)&0xff); out[3]=(byte)(n2>>24); 
+        out[4] = (byte)(n1&0xff);  out[5] = (byte)((n1>>8)&0xff);
+        out[6] = (byte)((n1>>16)&0xff); out[7] = (byte)(n1>>24);
+        } 
+/* Low-level decryption routine. Decrypts one 64-bit block */
+void gostdecrypt(gost_ctx *c, const byte *in,byte *out)
+        { 
+        register word32 n1, n2; /* As named in the GOST */ 
+        n1 = in[0]|(in[1]<<8)|(in[2]<<16)|(in[3]<<24); 
+        n2 = in[4]|(in[5]<<8)|(in[6]<<16)|(in[7]<<24); 
+        
+        n2 ^= f(c,n1+c->k[0]); n1 ^= f(c,n2+c->k[1]); 
+        n2 ^= f(c,n1+c->k[2]); n1 ^= f(c,n2+c->k[3]); 
+        n2 ^= f(c,n1+c->k[4]); n1 ^= f(c,n2+c->k[5]);
+        n2 ^= f(c,n1+c->k[6]); n1 ^= f(c,n2+c->k[7]); 
+        
+        n2 ^= f(c,n1+c->k[7]); n1 ^= f(c,n2+c->k[6]);
+        n2 ^= f(c,n1+c->k[5]); n1 ^= f(c,n2+c->k[4]);
+        n2 ^= f(c,n1+c->k[3]); n1 ^= f(c,n2+c->k[2]);
+        n2 ^= f(c,n1+c->k[1]); n1 ^= f(c,n2+c->k[0]);
+        
+        n2 ^= f(c,n1+c->k[7]); n1 ^= f(c,n2+c->k[6]);
+        n2 ^= f(c,n1+c->k[5]); n1 ^= f(c,n2+c->k[4]);
+        n2 ^= f(c,n1+c->k[3]); n1 ^= f(c,n2+c->k[2]);
+        n2 ^= f(c,n1+c->k[1]); n1 ^= f(c,n2+c->k[0]);
+        
+        n2 ^= f(c,n1+c->k[7]); n1 ^= f(c,n2+c->k[6]);
+        n2 ^= f(c,n1+c->k[5]); n1 ^= f(c,n2+c->k[4]);
+        n2 ^= f(c,n1+c->k[3]); n1 ^= f(c,n2+c->k[2]);
+        n2 ^= f(c,n1+c->k[1]); n1 ^= f(c,n2+c->k[0]);
+
+        out[0] = (byte)(n2&0xff);  out[1] = (byte)((n2>>8)&0xff);
+        out[2] = (byte)((n2>>16)&0xff); out[3]=(byte)(n2>>24);
+        out[4] = (byte)(n1&0xff);  out[5] = (byte)((n1>>8)&0xff);
+        out[6] = (byte)((n1>>16)&0xff); out[7] = (byte)(n1>>24);
+        } 
+
+/* Encrypts several blocks in ECB mode */
+void gost_enc(gost_ctx *c,const byte *clear,byte *cipher, int blocks)
+        { 
+        int i; 
+        for(i=0;i<blocks;i++)
+                { 
+                gostcrypt(c,clear,cipher); 
+                clear+=8;
+                cipher+=8;
+                }
+        }
+/* Decrypts several blocks in ECB mode */
+void gost_dec(gost_ctx *c, const byte *cipher,byte *clear, int blocks)
+        { 
+        int i; 
+        for(i=0;i<blocks;i++)
+                { 
+                gostdecrypt(c,cipher,clear); 
+                clear+=8; 
+                cipher+=8;
+                }
+        }
+
+/* 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)
+        {
+        byte cur_iv[8];
+        byte gamma[8];
+        int i,j;
+        const byte *in;
+        byte *out;
+        memcpy(cur_iv,iv,8);
+        for(i=0,in=clear,out=cipher;i<blocks;i++,in+=8,out+=8)
+                {
+                gostcrypt(ctx,cur_iv,gamma);
+                for (j=0;j<8;j++)
+                        {
+                        cur_iv[j]=out[j]=in[j]^gamma[j];
+                        }
+                }       
+        }       
+/* 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)
+        {
+        byte cur_iv[8];
+        byte gamma[8];
+        int i,j;
+        const byte *in;
+        byte *out;
+        memcpy(cur_iv,iv,8);
+        for(i=0,in=cipher,out=clear;i<blocks;i++,in+=8,out+=8)
+                {
+                gostcrypt(ctx,cur_iv,gamma);
+                for (j=0;j<8;j++)
+                        {
+                        out[j]=(cur_iv[j]=in[j])^gamma[j];
+                        }
+                }       
+        }       
+
+/* Encrypts one block using specified key */
+void gost_enc_with_key(gost_ctx *c,byte *key,byte *inblock,byte *outblock) 
+        {
+        gost_key(c,key);
+        gostcrypt(c,inblock,outblock);
+        }
+
+/* Set 256 bit  key into context */
+void gost_key(gost_ctx *c, const byte *k) 
+        { 
+        int i,j; 
+        for(i=0,j=0;i<8;i++,j+=4)
+                {
+                c->k[i]=k[j]|(k[j+1]<<8)|(k[j+2]<<16)|(k[j+3]<<24);
+                }               
+        } 
+
+/* Retrieve 256-bit key from context */
+void gost_get_key(gost_ctx *c, byte *k) 
+        {
+        int i,j; 
+        for(i=0,j=0;i<8;i++,j+=4)
+                {
+                k[j]=(byte)(c->k[i]& 0xFF);
+                k[j+1]=(byte)((c->k[i]>>8 )&0xFF);
+                k[j+2]=(byte)((c->k[i]>>16) &0xFF);
+                k[j+3]=(byte)((c->k[i]>>24) &0xFF);
+                }               
+        }
+
+/* Initalize context. Provides default value for subst_block */
+void gost_init(gost_ctx *c, const gost_subst_block *b)
+        {       
+        if(!b)
+                {
+                b=&GostR3411_94_TestParamSet;
+                }       
+        kboxinit(c,b); 
+        }
+
+/* Cleans up key from context */
+void gost_destroy(gost_ctx *c)
+        { 
+        int i; for(i=0;i<8;i++) c->k[i]=0; 
+        } 
+
+/* Compute GOST 28147 mac block 
+ * 
+ * Parameters
+ *   gost_ctx *c - context initalized with substitution blocks and key
+ *   buffer - 8-byte mac state buffer
+ *   block 8-byte block to process.
+ * */
+void mac_block(gost_ctx *c,byte *buffer,const  byte *block)
+        {
+        register word32 n1, n2; /* As named in the GOST */ 
+        int i;
+        for (i=0; i<8; i++)
+                {
+                buffer[i]^=block[i];
+                }         
+        n1 = buffer[0]|(buffer[1]<<8)|(buffer[2]<<16)|(buffer[3]<<24); 
+        n2 = buffer[4]|(buffer[5]<<8)|(buffer[6]<<16)|(buffer[7]<<24); 
+        /* Instead of swapping halves, swap names each round */ 
+         
+        n2 ^= f(c,n1+c->k[0]); n1 ^= f(c,n2+c->k[1]); 
+        n2 ^= f(c,n1+c->k[2]); n1 ^= f(c,n2+c->k[3]); 
+        n2 ^= f(c,n1+c->k[4]); n1 ^= f(c,n2+c->k[5]); 
+        n2 ^= f(c,n1+c->k[6]); n1 ^= f(c,n2+c->k[7]); 
+  
+        n2 ^= f(c,n1+c->k[0]); n1 ^= f(c,n2+c->k[1]);
+        n2 ^= f(c,n1+c->k[2]); n1 ^= f(c,n2+c->k[3]);
+        n2 ^= f(c,n1+c->k[4]); n1 ^= f(c,n2+c->k[5]);
+        n2 ^= f(c,n1+c->k[6]); n1 ^= f(c,n2+c->k[7]);
+
+        buffer[0] = (byte)(n1&0xff);  buffer[1] = (byte)((n1>>8)&0xff);
+        buffer[2] = (byte)((n1>>16)&0xff); buffer[3] = (byte)(n1>>24);
+        buffer[4] = (byte)(n2&0xff);  buffer[5] = (byte)((n2>>8)&0xff);
+        buffer[6] = (byte)((n2>>16)&0xff); buffer[7] = (byte)(n2>>24);
+        }
+
+/* Get mac with specified number of bits from MAC state buffer */
+void get_mac(byte *buffer,int nbits,byte *out)
+        {
+        int nbytes= nbits >> 3;
+        int rembits = nbits & 7;
+        int mask =rembits?((1<rembits)-1):0;
+        int i;
+        for (i=0;i<nbytes;i++) out[i]=buffer[i];
+        if (rembits) out[i]=buffer[i]&mask;
+        }       
+
+/* Compute mac of specified length (in bits) from data. 
+ * Context should be initialized with key and subst blocks */
+int gost_mac(gost_ctx *ctx,int mac_len,const unsigned char *data,
+        unsigned int data_len,unsigned char *mac) 
+        {
+        byte buffer[8]={0,0,0,0,0,0,0,0};
+        byte buf2[8];
+        unsigned int i;
+        for (i=0;i+8<=data_len;i+=8) 
+                mac_block(ctx,buffer,data+i);
+        if (i<data_len)
+                {
+                memset(buf2,0,8);
+                memcpy(buf2,data+i,data_len-i);
+                mac_block(ctx,buffer,buf2);
+                }       
+        get_mac(buffer,mac_len,mac);
+        return 1;
+        }
+
+/* Compute MAC with non-zero IV. Used in some RFC 4357 algorithms */
+int gost_mac_iv(gost_ctx *ctx,int mac_len,const unsigned char *iv,const unsigned char *data,
+        unsigned int data_len,unsigned char *mac) 
+        {
+        byte buffer[8];
+        byte buf2[8];
+        unsigned int i;
+        memcpy (buffer,iv,8);
+        for (i=0;i+8<=data_len;i+=8) 
+                mac_block(ctx,buffer,data+i);
+        if (i<data_len)
+                {
+                memset(buf2,0,8);
+                memcpy(buf2,data+i,data_len-i);
+                mac_block(ctx,buffer,buf2);
+                }       
+        get_mac(buffer,mac_len,mac);
+        return 1;
+        }
+
+/* Implements key meshing algorithm by modifing ctx and IV in place */
+void cryptopro_key_meshing(gost_ctx *ctx, unsigned char *iv)
+        {
+        unsigned char newkey[32],newiv[8];
+        /* Set static keymeshing key */
+        /* "Decrypt" key with keymeshing key */
+        gost_dec(ctx,CryptoProKeyMeshingKey,newkey,4);
+        /* set new key */
+        gost_key(ctx,newkey);
+        /* Encrypt iv with new key */
+        gostcrypt(ctx,iv,newiv);
+        memcpy(iv,newiv,8);
+        }