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/*
* SHACAL-2
* (C) 2017 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/shacal2.h>
#include <botan/loadstor.h>
#include <botan/cpuid.h>
namespace Botan {
namespace {
inline void SHACAL2_Fwd(uint32_t A, uint32_t B, uint32_t C, uint32_t& D,
uint32_t E, uint32_t F, uint32_t G, uint32_t& H,
uint32_t RK)
{
const uint32_t A_rho = rotate_right(A, 2) ^ rotate_right(A, 13) ^ rotate_right(A, 22);
const uint32_t E_rho = rotate_right(E, 6) ^ rotate_right(E, 11) ^ rotate_right(E, 25);
H += E_rho + ((E & F) ^ (~E & G)) + RK;
D += H;
H += A_rho + ((A & B) | ((A | B) & C));
}
inline void SHACAL2_Rev(uint32_t A, uint32_t B, uint32_t C, uint32_t& D,
uint32_t E, uint32_t F, uint32_t G, uint32_t& H,
uint32_t RK)
{
const uint32_t A_rho = rotate_right(A, 2) ^ rotate_right(A, 13) ^ rotate_right(A, 22);
const uint32_t E_rho = rotate_right(E, 6) ^ rotate_right(E, 11) ^ rotate_right(E, 25);
H -= A_rho + ((A & B) | ((A | B) & C));
D -= H;
H -= E_rho + ((E & F) ^ (~E & G)) + RK;
}
}
/*
* SHACAL2 Encryption
*/
void SHACAL2::encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const
{
#if defined(BOTAN_HAS_SHACAL2_SIMD)
if(CPUID::has_simd_32())
{
while(blocks >= 4)
{
simd_encrypt_4(in, out);
in += 4*BLOCK_SIZE;
out += 4*BLOCK_SIZE;
blocks -= 4;
}
}
#endif
for(size_t i = 0; i != blocks; ++i)
{
uint32_t A = load_be<uint32_t>(in, 0);
uint32_t B = load_be<uint32_t>(in, 1);
uint32_t C = load_be<uint32_t>(in, 2);
uint32_t D = load_be<uint32_t>(in, 3);
uint32_t E = load_be<uint32_t>(in, 4);
uint32_t F = load_be<uint32_t>(in, 5);
uint32_t G = load_be<uint32_t>(in, 6);
uint32_t H = load_be<uint32_t>(in, 7);
for(size_t r = 0; r != 64; r += 8)
{
SHACAL2_Fwd(A, B, C, D, E, F, G, H, m_RK[r+0]);
SHACAL2_Fwd(H, A, B, C, D, E, F, G, m_RK[r+1]);
SHACAL2_Fwd(G, H, A, B, C, D, E, F, m_RK[r+2]);
SHACAL2_Fwd(F, G, H, A, B, C, D, E, m_RK[r+3]);
SHACAL2_Fwd(E, F, G, H, A, B, C, D, m_RK[r+4]);
SHACAL2_Fwd(D, E, F, G, H, A, B, C, m_RK[r+5]);
SHACAL2_Fwd(C, D, E, F, G, H, A, B, m_RK[r+6]);
SHACAL2_Fwd(B, C, D, E, F, G, H, A, m_RK[r+7]);
}
store_be(out, A, B, C, D, E, F, G, H);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/*
* SHACAL2 Encryption
*/
void SHACAL2::decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const
{
#if defined(BOTAN_HAS_SHACAL2_SIMD)
if(CPUID::has_simd_32())
{
while(blocks >= 4)
{
simd_decrypt_4(in, out);
in += 4*BLOCK_SIZE;
out += 4*BLOCK_SIZE;
blocks -= 4;
}
}
#endif
for(size_t i = 0; i != blocks; ++i)
{
uint32_t A = load_be<uint32_t>(in, 0);
uint32_t B = load_be<uint32_t>(in, 1);
uint32_t C = load_be<uint32_t>(in, 2);
uint32_t D = load_be<uint32_t>(in, 3);
uint32_t E = load_be<uint32_t>(in, 4);
uint32_t F = load_be<uint32_t>(in, 5);
uint32_t G = load_be<uint32_t>(in, 6);
uint32_t H = load_be<uint32_t>(in, 7);
for(size_t r = 0; r != 64; r += 8)
{
SHACAL2_Rev(B, C, D, E, F, G, H, A, m_RK[63-r]);
SHACAL2_Rev(C, D, E, F, G, H, A, B, m_RK[62-r]);
SHACAL2_Rev(D, E, F, G, H, A, B, C, m_RK[61-r]);
SHACAL2_Rev(E, F, G, H, A, B, C, D, m_RK[60-r]);
SHACAL2_Rev(F, G, H, A, B, C, D, E, m_RK[59-r]);
SHACAL2_Rev(G, H, A, B, C, D, E, F, m_RK[58-r]);
SHACAL2_Rev(H, A, B, C, D, E, F, G, m_RK[57-r]);
SHACAL2_Rev(A, B, C, D, E, F, G, H, m_RK[56-r]);
}
store_be(out, A, B, C, D, E, F, G, H);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/*
* SHACAL2 Key Schedule
*/
void SHACAL2::key_schedule(const uint8_t key[], size_t len)
{
const uint32_t RC[64] = {
0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2
};
if(m_RK.empty())
m_RK.resize(64);
else
clear_mem(m_RK.data(), m_RK.size());
load_be(m_RK.data(), key, len/4);
for(size_t i = 16; i != 64; ++i)
{
const uint32_t sigma0_15 = rotate_right(m_RK[i-15], 7) ^ rotate_right(m_RK[i-15], 18) ^ (m_RK[i-15] >> 3);
const uint32_t sigma1_2 = rotate_right(m_RK[i-2], 17) ^ rotate_right(m_RK[i-2], 19) ^ (m_RK[i-2] >> 10);
m_RK[i] = m_RK[i-16] + sigma0_15 + m_RK[i-7] + sigma1_2;
}
for(size_t i = 0; i != 64; ++i)
{
m_RK[i] += RC[i];
}
}
std::string SHACAL2::provider() const
{
return "base";
}
/*
* Clear memory of sensitive data
*/
void SHACAL2::clear()
{
zap(m_RK);
}
}
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