--- /dev/null
+/**********************************************************************
+ * 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);
+ i+=8;
+ }
+ if (i==8)
+ {
+ memset(buf2,0,8);
+ 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);
+ i+=8;
+ }
+ if (i==8)
+ {
+ memset(buf2,0,8);
+ 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);
+ }
projects / cassiopeia.git / blobdiff