--- /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] = (word32) (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) | ((word32) in[3] << 24);
+ n2 = in[4] | (in[5] << 8) | (in[6] << 16) | ((word32) 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) | ((word32) in[3] << 24);
+ n2 = in[4] | (in[5] << 8) | (in[6] << 16) | ((word32) 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) | ((word32) 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) | ((word32)
+ buffer[3] << 24);
+ n2 = buffer[4] | (buffer[5] << 8) | (buffer[6] << 16) | ((word32)
+ 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 / openssl-gost / engine.git / blobdiff