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aes_rvk64.c
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aes_rvk64.c
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// aes_rvk64.c
// 2020-05-03 Markku-Juhani O. Saarinen <mjos@pqhsield.com>
// Copyright (c) 2020, PQShield Ltd. All rights reserved.
// === FIPS 197 Algorithm Implementation for RV64 Krypto / AES64
#include "riscv_crypto.h"
#ifdef RVKINTRIN_RV64
#include "aes_api.h"
#include "rv_endian.h"
#include <stddef.h>
// Encrypt rounds. Implements AES-128/192/256 depending on nr = {10,12,14}
// Per round: 2 * ENCSM, 2 * load, 2 * XOR
#define SAES64_ENC_ROUND(r0, r1, s0, s1, i) { \
r0 = _rv64_aes64esm(s0, s1); \
r1 = _rv64_aes64esm(s1, s0); \
k0 = kp[2 * i]; \
k1 = kp[2 * i + 1]; \
r0 = r0 ^ k0; \
r1 = r1 ^ k1; }
void aes_enc_rounds_rvk64(uint8_t ct[16], const uint8_t pt[16],
const uint32_t rk[], int nr)
{
// key pointer
const uint64_t *kp = (const uint64_t *) rk;
uint64_t t0, t1, u0, u1, k0, k1;
t0 = ((const uint64_t *) pt)[0]; // get plaintext
t1 = ((const uint64_t *) pt)[1];
k0 = kp[0]; // load first round
k1 = kp[1];
t0 = t0 ^ k0;
t1 = t1 ^ k1;
SAES64_ENC_ROUND(u0, u1, t0, t1, 1); // 6 insn / round
SAES64_ENC_ROUND(t0, t1, u0, u1, 2);
SAES64_ENC_ROUND(u0, u1, t0, t1, 3);
SAES64_ENC_ROUND(t0, t1, u0, u1, 4);
SAES64_ENC_ROUND(u0, u1, t0, t1, 5);
SAES64_ENC_ROUND(t0, t1, u0, u1, 6);
SAES64_ENC_ROUND(u0, u1, t0, t1, 7);
SAES64_ENC_ROUND(t0, t1, u0, u1, 8);
SAES64_ENC_ROUND(u0, u1, t0, t1, 9);
// In reality we would entirely inline these for all 128/192/256 versions
if (nr >= 12) { // AES-192, AES-256
SAES64_ENC_ROUND(t0, t1, u0, u1, 10);
SAES64_ENC_ROUND(u0, u1, t0, t1, 11);
if (nr > 12) {
SAES64_ENC_ROUND(t0, t1, u0, u1, 12);
SAES64_ENC_ROUND(u0, u1, t0, t1, 13);
k0 = kp[2 * 14]; // AES-256 last round key
k1 = kp[2 * 14 + 1];
} else {
k0 = kp[2 * 12]; // AES-192 last round key
k1 = kp[2 * 12 + 1];
}
} else {
k0 = kp[2 * 10]; // AES-128 last round key
k1 = kp[2 * 10 + 1];
}
t0 = _rv64_aes64es(u0, u1); // Final round; ENCS not ENCSM
t1 = _rv64_aes64es(u1, u0);
t0 = t0 ^ k0; // last round key
t1 = t1 ^ k1;
((uint64_t *) ct)[0] = t0; // store ciphertext
((uint64_t *) ct)[1] = t1;
}
// Wrappers
void aes128_enc_ecb_rvk64(uint8_t ct[16], const uint8_t pt[16],
const uint32_t rk[AES128_RK_WORDS])
{
aes_enc_rounds_rvk64(ct, pt, rk, AES128_ROUNDS);
}
void aes192_enc_ecb_rvk64(uint8_t ct[16], const uint8_t pt[16],
const uint32_t rk[AES192_RK_WORDS])
{
aes_enc_rounds_rvk64(ct, pt, rk, AES192_ROUNDS);
}
void aes256_enc_ecb_rvk64(uint8_t ct[16], const uint8_t pt[16],
const uint32_t rk[AES256_RK_WORDS])
{
aes_enc_rounds_rvk64(ct, pt, rk, AES256_ROUNDS);
}
// Key schedule for AES-128 Encryption.
// For each round 1 * SAES64.KS1, 2 * SAES64.KS2 and 2 * store
#define SAES64_KEY128_STEP(i) { \
kp[2 * i] = k0; \
kp[2 * i + 1] = k1; \
ks = _rv64_aes64ks1i(k1, i); \
k0 = _rv64_aes64ks2(ks, k0); \
k1 = _rv64_aes64ks2(k0, k1); }
void aes128_enc_key_rvk64(uint32_t rk[44], const uint8_t key[16])
{
uint64_t *kp = (uint64_t *) rk; // key pointer
uint64_t k0, k1, ks;
k0 = get64u_le(key); // load secret key
k1 = get64u_le(key + 8);
SAES64_KEY128_STEP(0); // 5 insn each, unrolled
SAES64_KEY128_STEP(1);
SAES64_KEY128_STEP(2);
SAES64_KEY128_STEP(3);
SAES64_KEY128_STEP(4);
SAES64_KEY128_STEP(5);
SAES64_KEY128_STEP(6);
SAES64_KEY128_STEP(7);
SAES64_KEY128_STEP(8);
SAES64_KEY128_STEP(9); // (10 steps, 10 rounds)
kp[20] = k0; // last round key
kp[21] = k1;
}
// Key schedule for AES-192 encryption.
// For each 1.5 rounds 1 * SAES64.KS1, 3 * SAES64.KS2 and 3 * store
#define SAES64_KEY192_STEP(i) { \
kp[3 * i] = k0; \
kp[3 * i + 1] = k1; \
kp[3 * i + 2] = k2; \
ks = _rv64_aes64ks1i(k2, i); \
k0 = _rv64_aes64ks2(ks, k0); \
k1 = _rv64_aes64ks2(k0, k1); \
k2 = _rv64_aes64ks2(k1, k2); }
void aes192_enc_key_rvk64(uint32_t rk[52], const uint8_t key[24])
{
uint64_t *kp = (uint64_t *) rk; // key pointer
uint64_t k0, k1, k2, ks;
k0 = get64u_le(key); // load secret key
k1 = get64u_le(key + 8);
k2 = get64u_le(key + 16);
SAES64_KEY192_STEP(0); // two steps is 3 rounds
SAES64_KEY192_STEP(1); // 14/3 = 4.7 insn/round
SAES64_KEY192_STEP(2);
SAES64_KEY192_STEP(3);
SAES64_KEY192_STEP(4);
SAES64_KEY192_STEP(5);
SAES64_KEY192_STEP(6);
kp[21] = k0; // last full state
kp[22] = k1;
kp[23] = k2;
ks = _rv64_aes64ks1i(k2, 7); // (8 steps, 12 rounds)
k0 = _rv64_aes64ks2(ks, k0);
k1 = _rv64_aes64ks2(k0, k1); // no need for k2
kp[24] = k0; // last round key
kp[25] = k1;
}
// Key schedule for AES-256 encryption.
// For each 2 rounds: 2 * SAES64.KS1, 4 * SAES64.KS2 and 4 * store
#define SAES64_KEY256_STEP(i) { \
kp[4 * i] = k0; \
kp[4 * i + 1] = k1; \
kp[4 * i + 2] = k2; \
kp[4 * i + 3] = k3; \
ks = _rv64_aes64ks1i(k3, i); \
k0 = _rv64_aes64ks2(ks, k0); \
k1 = _rv64_aes64ks2(k0, k1); \
ks = _rv64_aes64ks1i(k1, 10); \
k2 = _rv64_aes64ks2(ks, k2); \
k3 = _rv64_aes64ks2(k2, k3); }
void aes256_enc_key_rvk64(uint32_t rk[60], const uint8_t key[32])
{
uint64_t *kp = (uint64_t *) rk; // key pointer
uint64_t k0, k1, k2, k3, ks;
k0 = get64u_le(key); // load secret key
k1 = get64u_le(key + 8);
k2 = get64u_le(key + 16);
k3 = get64u_le(key + 24);
SAES64_KEY256_STEP(0); // 1 steps is 2 rounds
SAES64_KEY256_STEP(1); // 10/2 = 5 insn/round
SAES64_KEY256_STEP(2);
SAES64_KEY256_STEP(3);
SAES64_KEY256_STEP(4);
SAES64_KEY256_STEP(5);
kp[24] = k0; // store last full state
kp[25] = k1;
kp[26] = k2;
kp[27] = k3;
ks = _rv64_aes64ks1i(k3, 6); // no need for k2, k3
k0 = _rv64_aes64ks2(ks, k0);
k1 = _rv64_aes64ks2(k0, k1);
kp[28] = k0; // store last round key
kp[29] = k1;
}
// Decrypt rounds. Implements AES-128/192/256 depending on nr = {10,12,14}
// Per round: 2 * load, 2 * XOR, 2 * DECSM
#define SAES64_DEC_ROUND(r0, r1, s0, s1, i) { \
k0 = kp[2 * i + 2]; \
k1 = kp[2 * i + 3]; \
s0 = s0 ^ k0; \
s1 = s1 ^ k1; \
r0 = _rv64_aes64dsm(s0, s1); \
r1 = _rv64_aes64dsm(s1, s0); }
void aes_dec_rounds_rvk64(uint8_t pt[16], const uint8_t ct[16],
const uint32_t rk[], int nr)
{
// key pointer (just a cast)
const uint64_t *kp = (const uint64_t *) rk;
uint64_t t0, t1, u0, u1, k0, k1;
t0 = ((const uint64_t *) ct)[0]; // get ciphertext
t1 = ((const uint64_t *) ct)[1];
// In reality we would entirely inline these for all 128/192/256 versions
if (nr >= 12) {
if (nr > 12) { // AES-256
SAES64_DEC_ROUND(u0, u1, t0, t1, 13);
SAES64_DEC_ROUND(t0, t1, u0, u1, 12);
} // AES-192, AES-192
SAES64_DEC_ROUND(u0, u1, t0, t1, 11);
SAES64_DEC_ROUND(t0, t1, u0, u1, 10);
}
SAES64_DEC_ROUND(u0, u1, t0, t1, 9); // 6 insn / round
SAES64_DEC_ROUND(t0, t1, u0, u1, 8);
SAES64_DEC_ROUND(u0, u1, t0, t1, 7);
SAES64_DEC_ROUND(t0, t1, u0, u1, 6);
SAES64_DEC_ROUND(u0, u1, t0, t1, 5);
SAES64_DEC_ROUND(t0, t1, u0, u1, 4);
SAES64_DEC_ROUND(u0, u1, t0, t1, 3);
SAES64_DEC_ROUND(t0, t1, u0, u1, 2);
SAES64_DEC_ROUND(u0, u1, t0, t1, 1);
k0 = kp[2]; // final decrypt round
k1 = kp[3];
u0 = u0 ^ k0;
u1 = u1 ^ k1;
t0 = _rv64_aes64ds(u0, u1); // DECS instead of DECSM
t1 = _rv64_aes64ds(u1, u0);
k0 = kp[0]; // first round key
k1 = kp[1];
t0 = t0 ^ k0;
t1 = t1 ^ k1;
((uint64_t *) pt)[0] = t0; // store plaintext
((uint64_t *) pt)[1] = t1;
return;
}
// Wrappers
void aes128_dec_ecb_rvk64(uint8_t pt[16], const uint8_t ct[16],
const uint32_t rk[AES128_RK_WORDS])
{
aes_dec_rounds_rvk64(pt, ct, rk, AES128_ROUNDS);
}
void aes192_dec_ecb_rvk64(uint8_t pt[16], const uint8_t ct[16],
const uint32_t rk[AES192_RK_WORDS])
{
aes_dec_rounds_rvk64(pt, ct, rk, AES192_ROUNDS);
}
void aes256_dec_ecb_rvk64(uint8_t pt[16], const uint8_t ct[16],
const uint32_t rk[AES256_RK_WORDS])
{
aes_dec_rounds_rvk64(pt, ct, rk, AES256_ROUNDS);
}
// Helper: apply inverse mixcolumns to a vector
static inline void rvk64_dec_invmc(uint64_t * v, size_t len)
{
size_t i;
for (i = 0; i < len; i++) {
v[i] = _rv64_aes64im(v[i]);
}
}
// Key schedule for AES-128 decryption.
void aes128_dec_key_rvk64(uint32_t rk[44], const uint8_t key[16])
{
// create an encryption key and modify middle rounds
aes128_enc_key_rvk64(rk, key);
rvk64_dec_invmc(((uint64_t *) rk) + 2, AES128_RK_WORDS / 2 - 4);
}
// Key schedule for AES-192 decryption.
void aes192_dec_key_rvk64(uint32_t rk[52], const uint8_t key[24])
{
// create an encryption key and modify middle rounds
aes192_enc_key_rvk64(rk, key);
rvk64_dec_invmc(((uint64_t *) rk) + 2, AES192_RK_WORDS / 2 - 4);
}
// Key schedule for AES-256 decryption.
void aes256_dec_key_rvk64(uint32_t rk[60], const uint8_t key[32])
{
// create an encryption key and modify middle rounds
aes256_enc_key_rvk64(rk, key);
rvk64_dec_invmc(((uint64_t *) rk) + 2, AES256_RK_WORDS / 2 - 4);
}
#endif // RVKINTRIN_RV64