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#include <assert.h>
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#include <string.h>
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#include "gost89.h"
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// Substitution blocks from RFC 4357, item 11.2
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gost_subst_block GOST28147_89_RFC = {
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{0x4,0xA,0x9,0x2,0xD,0x8,0x0,0xE,0x6,0xB,0x1,0xC,0x7,0xF,0x5,0x3},
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{0xE,0xB,0x4,0xC,0x6,0xD,0xF,0xA,0x2,0x3,0x8,0x1,0x0,0x7,0x5,0x9},
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{0x5,0x8,0x1,0xD,0xA,0x3,0x4,0x2,0xE,0xF,0xC,0x7,0x6,0x0,0x9,0xB},
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{0x7,0xD,0xA,0x1,0x0,0x8,0x9,0xF,0xE,0x4,0x6,0xC,0xB,0x2,0x5,0x3},
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{0x6,0xC,0x7,0x1,0x5,0xF,0xD,0x8,0x4,0xA,0x9,0xE,0x0,0x3,0xB,0x2},
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{0x4,0xB,0xA,0x0,0x7,0x2,0x1,0xD,0x3,0x6,0x8,0x5,0x9,0xC,0xF,0xE},
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{0xD,0xB,0x4,0x1,0x3,0xF,0x5,0x9,0x0,0xA,0xE,0x7,0x6,0x8,0x2,0xC},
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{0x1,0xF,0xD,0x0,0x5,0x7,0xA,0x4,0x9,0x2,0x3,0xE,0x6,0xB,0x8,0xC}
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};
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void gost_init(gost_ctx *c, const gost_subst_block* b) {
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int i;
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if (!b)
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b = &GOST28147_89_RFC;
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for (i = 0; i < 256; ++i) {
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c->k21[i] = (b->k2[i>>4]<<4 | b->k1 [i&15]);
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c->k43[i] = (b->k4[i>>4]<<4 | b->k3 [i&15])<<8;
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c->k65[i] = (b->k6[i>>4]<<4 | b->k5 [i&15])<<16;
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c->k87[i] = (b->k8[i>>4]<<4 | b->k7 [i&15])<<24;
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}
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}
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void gost_destroy(gost_ctx *c) {
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int i;
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for (i = 0; i < 8; ++i)
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c->k[i] = 0;
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for (i = 0; i < 256; ++i)
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c->k87[i] = c->k65[i] = c->k43[i] = c->k21[i] = 0;
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}
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void gost_set_key(gost_ctx *c, const uint8_t *k) {
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int i, j;
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for (i=0, j=0; i < 8; i+=1, j+=4)
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c->k[i] = (k[j]<<24) | (k[j+1]<<16) | (k[j+2]<<8) | k[j+3];
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}
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void gost_get_key(gost_ctx *c, uint8_t *k) {
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int i, j;
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for (i=0, j=0; i < 8; i+=1, j+=4) {
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k[j] = (uint8_t) ((c->k[i] ) &0xFF);
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k[j+1] = (uint8_t) ((c->k[i]>>8 ) &0xFF);
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k[j+2] = (uint8_t) ((c->k[i]>>16) &0xFF);
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k[j+3] = (uint8_t) ((c->k[i]>>24) &0xFF);
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}
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}
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inline uint32_t f(gost_ctx *c, uint32_t x) {
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x = c->k87[x>>24 & 255] | c->k65[x>>16 & 255] |
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c->k43[x>> 8 & 255] | c->k21[x & 255];
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return x<<11 | x>>(32-11);
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}
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inline void gost_encrypt_block(gost_ctx *c, const uint8_t *in, uint8_t *out) {
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register uint32_t n1, n2;
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n1 = (in[0]<<24) | (in[1]<<16) | (in[2]<<8) | in[3];
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n2 = (in[4]<<24) | (in[5]<<16) | (in[6]<<8) | in[7];
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n2 ^= f(c,n1+c->k[0]); n1 ^= f(c,n2+c->k[1]);
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n2 ^= f(c,n1+c->k[2]); n1 ^= f(c,n2+c->k[3]);
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n2 ^= f(c,n1+c->k[4]); n1 ^= f(c,n2+c->k[5]);
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n2 ^= f(c,n1+c->k[6]); n1 ^= f(c,n2+c->k[7]);
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n2 ^= f(c,n1+c->k[0]); n1 ^= f(c,n2+c->k[1]);
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n2 ^= f(c,n1+c->k[2]); n1 ^= f(c,n2+c->k[3]);
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n2 ^= f(c,n1+c->k[4]); n1 ^= f(c,n2+c->k[5]);
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n2 ^= f(c,n1+c->k[6]); n1 ^= f(c,n2+c->k[7]);
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n2 ^= f(c,n1+c->k[0]); n1 ^= f(c,n2+c->k[1]);
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n2 ^= f(c,n1+c->k[2]); n1 ^= f(c,n2+c->k[3]);
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n2 ^= f(c,n1+c->k[4]); n1 ^= f(c,n2+c->k[5]);
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n2 ^= f(c,n1+c->k[6]); n1 ^= f(c,n2+c->k[7]);
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n2 ^= f(c,n1+c->k[7]); n1 ^= f(c,n2+c->k[6]);
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n2 ^= f(c,n1+c->k[5]); n1 ^= f(c,n2+c->k[4]);
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n2 ^= f(c,n1+c->k[3]); n1 ^= f(c,n2+c->k[2]);
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n2 ^= f(c,n1+c->k[1]); n1 ^= f(c,n2+c->k[0]);
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out[0] = (uint8_t) (n2>>24); out[1] = (uint8_t) ((n2>>16)&0xff);
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out[2] = (uint8_t) ((n2>>8)&0xff); out[3] = (uint8_t) (n2&0xff);
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out[4] = (uint8_t) (n1>>24); out[5] = (uint8_t) ((n1>>16)&0xff);
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out[6] = (uint8_t) ((n1>>8)&0xff); out[7] = (uint8_t) (n1&0xff);
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}
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inline void gost_decrypt_block(gost_ctx *c, const uint8_t *in, uint8_t *out) {
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register uint32_t n1, n2;
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n1 = (in[0]<<24) | (in[1]<<16) | (in[2]<<8) | in[3];
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n2 = (in[4]<<24) | (in[5]<<16) | (in[6]<<8) | in[7];
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n2 ^= f(c,n1+c->k[0]); n1 ^= f(c,n2+c->k[1]);
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n2 ^= f(c,n1+c->k[2]); n1 ^= f(c,n2+c->k[3]);
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n2 ^= f(c,n1+c->k[4]); n1 ^= f(c,n2+c->k[5]);
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n2 ^= f(c,n1+c->k[6]); n1 ^= f(c,n2+c->k[7]);
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n2 ^= f(c,n1+c->k[7]); n1 ^= f(c,n2+c->k[6]);
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n2 ^= f(c,n1+c->k[5]); n1 ^= f(c,n2+c->k[4]);
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n2 ^= f(c,n1+c->k[3]); n1 ^= f(c,n2+c->k[2]);
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n2 ^= f(c,n1+c->k[1]); n1 ^= f(c,n2+c->k[0]);
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n2 ^= f(c,n1+c->k[7]); n1 ^= f(c,n2+c->k[6]);
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n2 ^= f(c,n1+c->k[5]); n1 ^= f(c,n2+c->k[4]);
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n2 ^= f(c,n1+c->k[3]); n1 ^= f(c,n2+c->k[2]);
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n2 ^= f(c,n1+c->k[1]); n1 ^= f(c,n2+c->k[0]);
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n2 ^= f(c,n1+c->k[7]); n1 ^= f(c,n2+c->k[6]);
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n2 ^= f(c,n1+c->k[5]); n1 ^= f(c,n2+c->k[4]);
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n2 ^= f(c,n1+c->k[3]); n1 ^= f(c,n2+c->k[2]);
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n2 ^= f(c,n1+c->k[1]); n1 ^= f(c,n2+c->k[0]);
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out[0] = (uint8_t) (n2>>24); out[1] = (uint8_t) ((n2>>16)&0xff);
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out[2] = (uint8_t) ((n2>>8)&0xff); out[3] = (uint8_t) (n2&0xff);
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out[4] = (uint8_t) (n1>>24); out[5] = (uint8_t) ((n1>>16)&0xff);
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out[6] = (uint8_t) ((n1>>8)&0xff); out[7] = (uint8_t) (n1&0xff);
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}
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void gost_ecb_encrypt(gost_ctx *ctx, const uint8_t *in, uint8_t *out, size_t blocks) {
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while (blocks--) {
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gost_encrypt_block(ctx, in, out);
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in += 8;
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out += 8;
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}
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}
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void gost_ecb_decrypt(gost_ctx *ctx, const uint8_t *in, uint8_t *out, size_t blocks) {
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while (blocks--) {
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gost_decrypt_block(ctx, in, out);
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in += 8;
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out += 8;
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}
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}
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void gost_cfb_encrypt(gost_ctx *ctx, const uint8_t *iv, const uint8_t *in, uint8_t *out, size_t blocks) {
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uint8_t cur_iv[8], gamma[8];
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memcpy((void*) &cur_iv[0], (const void*) &iv[0], 8);
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while (blocks--) {
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gost_encrypt_block(ctx, cur_iv, gamma);
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for (int i = 0; i < 8; ++i) {
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out[i] = in[i] ^ gamma[i];
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cur_iv[i] = out[i];
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}
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in += 8;
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out += 8;
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}
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}
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void gost_cfb_decrypt(gost_ctx *ctx, const uint8_t *iv, const uint8_t *in, uint8_t *out, size_t blocks) {
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uint8_t cur_iv[8], gamma[8];
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memcpy((void*) &cur_iv[0], (const void*) &iv[0], 8);
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while (blocks--) {
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gost_encrypt_block(ctx, cur_iv, gamma);
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for (int i = 0; i < 8; ++i) {
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out[i] = in[i] ^ gamma[i];
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cur_iv[i] = in[i];
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}
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in += 8;
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out += 8;
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}
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}
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inline void gost_mac_block(gost_ctx *c, const uint8_t *in, uint8_t *out) {
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register uint32_t n1, n2;
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n1 = (in[0]<<24) | (in[1]<<16) | (in[2]<<8) | in[3];
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n2 = (in[4]<<24) | (in[5]<<16) | (in[6]<<8) | in[7];
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n2 ^= f(c,n1+c->k[0]); n1 ^= f(c,n2+c->k[1]);
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n2 ^= f(c,n1+c->k[2]); n1 ^= f(c,n2+c->k[3]);
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n2 ^= f(c,n1+c->k[4]); n1 ^= f(c,n2+c->k[5]);
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n2 ^= f(c,n1+c->k[6]); n1 ^= f(c,n2+c->k[7]);
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n2 ^= f(c,n1+c->k[0]); n1 ^= f(c,n2+c->k[1]);
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n2 ^= f(c,n1+c->k[2]); n1 ^= f(c,n2+c->k[3]);
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n2 ^= f(c,n1+c->k[4]); n1 ^= f(c,n2+c->k[5]);
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n2 ^= f(c,n1+c->k[6]); n1 ^= f(c,n2+c->k[7]);
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out[0] = (uint8_t) (n2>>24); out[1] = (uint8_t) ((n2>>16)&0xff);
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out[2] = (uint8_t) ((n2>>8)&0xff); out[3] = (uint8_t) (n2&0xff);
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out[4] = (uint8_t) (n1>>24); out[5] = (uint8_t) ((n1>>16)&0xff);
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out[6] = (uint8_t) ((n1>>8)&0xff); out[7] = (uint8_t) (n1&0xff);
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}
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void gost_mac(gost_ctx *ctx, const uint8_t *data, size_t data_len, uint8_t *mac, const size_t mac_len) {
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assert(data_len >= 16);
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assert(mac_len <= 32);
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uint8_t out[8] = {0};
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while (data_len > 0) {
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uint8_t in[8] = {0};
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memcpy((void*) &in[0], (const void*) &data[0], data_len < 8 ? data_len : 8);
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for (int i = 0; i < 8; ++i)
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in[i] = in[i] ^ out[i];
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gost_mac_block(ctx, in, &out[0]);
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data_len -= 8;
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data += 8;
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}
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uint8_t nbytes = (mac_len>>3) + ((mac_len&7) > 0 ? 1 : 0);
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memset((void*) mac, 0, nbytes);
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uint32_t fmac = (out[0]<<24) | (out[1]<<16) | (out[2]<<8) | out[3];
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fmac <<= 32 - mac_len;
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out[0] = (uint8_t) (fmac>>24); out[1] = (uint8_t) ((fmac>>16)&0xff);
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out[2] = (uint8_t) ((fmac>>8)&0xff); out[3] = (uint8_t) (fmac&0xff);
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for (int i = 0; i < nbytes; ++i)
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mac[i] = out[i];
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}
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