/* * Calculate H(i+1) = Hash(Hi,Mi) * Where H and M are 32 bytes long */ static int hash_step(gost_ctx * c, byte * H, const byte * M) { byte U[32], W[32], V[32], S[32], Key[32]; int i; /* Compute first key */ xor_blocks(W, H, M, 32); swap_bytes(W, Key); /* Encrypt first 8 bytes of H with first key */ gost_enc_with_key(c, Key, H, S); /* Compute second key */ circle_xor8(H, U); circle_xor8(M, V); circle_xor8(V, V); xor_blocks(W, U, V, 32); swap_bytes(W, Key); /* encrypt second 8 bytes of H with second key */ gost_enc_with_key(c, Key, H + 8, S + 8); /* compute third key */ circle_xor8(U, U); U[31] = ~U[31]; U[29] = ~U[29]; U[28] = ~U[28]; U[24] = ~U[24]; U[23] = ~U[23]; U[20] = ~U[20]; U[18] = ~U[18]; U[17] = ~U[17]; U[14] = ~U[14]; U[12] = ~U[12]; U[10] = ~U[10]; U[8] = ~U[8]; U[7] = ~U[7]; U[5] = ~U[5]; U[3] = ~U[3]; U[1] = ~U[1]; circle_xor8(V, V); circle_xor8(V, V); xor_blocks(W, U, V, 32); swap_bytes(W, Key); /* encrypt third 8 bytes of H with third key */ gost_enc_with_key(c, Key, H + 16, S + 16); /* Compute fourth key */ circle_xor8(U, U); circle_xor8(V, V); circle_xor8(V, V); xor_blocks(W, U, V, 32); swap_bytes(W, Key); /* Encrypt last 8 bytes with fourth key */ gost_enc_with_key(c, Key, H + 24, S + 24); for (i = 0; i < 12; i++) transform_3(S); xor_blocks(S, S, M, 32); transform_3(S); xor_blocks(S, S, H, 32); for (i = 0; i < 61; i++) transform_3(S); memcpy(H, S, 32); return 1; }
/* * Calculate H(i+1) = Hash(Hi,Mi) * Where H and M are 32 bytes long */ static int hash_step(GOSTR341194_CTX *c, unsigned char *H, const unsigned char *M) { unsigned char U[32], W[32], V[32], S[32], Key[32]; int i; /* Compute first key */ xor_blocks(W, H, M, 32); swap_bytes(W, Key); /* Encrypt first 8 bytes of H with first key */ Gost2814789_set_key(&c->cipher, Key, 256); Gost2814789_encrypt(H, S, &c->cipher); /* Compute second key */ circle_xor8(H, U); circle_xor8(M, V); circle_xor8(V, V); xor_blocks(W, U, V, 32); swap_bytes(W, Key); /* encrypt second 8 bytes of H with second key */ Gost2814789_set_key(&c->cipher, Key, 256); Gost2814789_encrypt(H+8, S+8, &c->cipher); /* compute third key */ circle_xor8(U, U); U[31] = ~U[31]; U[29] = ~U[29]; U[28] = ~U[28]; U[24] = ~U[24]; U[23] = ~U[23]; U[20] = ~U[20]; U[18] = ~U[18]; U[17] = ~U[17]; U[14] = ~U[14]; U[12] = ~U[12]; U[10] = ~U[10]; U[8] = ~U[8]; U[7] = ~U[7]; U[5] = ~U[5]; U[3] = ~U[3]; U[1] = ~U[1]; circle_xor8(V, V); circle_xor8(V, V); xor_blocks(W, U, V, 32); swap_bytes(W, Key); /* encrypt third 8 bytes of H with third key */ Gost2814789_set_key(&c->cipher, Key, 256); Gost2814789_encrypt(H+16, S+16, &c->cipher); /* Compute fourth key */ circle_xor8(U, U); circle_xor8(V, V); circle_xor8(V, V); xor_blocks(W, U, V, 32); swap_bytes(W, Key); /* Encrypt last 8 bytes with fourth key */ Gost2814789_set_key(&c->cipher, Key, 256); Gost2814789_encrypt(H+24, S+24, &c->cipher); for (i = 0; i < 12; i++) transform_3(S); xor_blocks(S, S, M, 32); transform_3(S); xor_blocks(S, S, H, 32); for (i = 0; i < 61; i++) transform_3(S); memcpy(H, S, 32); return 1; }