/
aes.S
executable file
·132 lines (109 loc) · 1.98 KB
/
aes.S
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.text
.global aes_encrypt, aes_expand_key
/*
* void aes_expand_key(const uint64_t *key, uint64_t *rk);
*/
aes_expand_key:
ld t0, 0(a0)
ld t1, 8(a0)
/* rk[0] */
sd t0, 0(a1)
sd t1, 8(a1)
/* rk[1] */
aes64ks1i t2, t1, 0
aes64ks2 t0, t2, t0
aes64ks2 t1, t0, t1
sd t0, 16(a1)
sd t1, 24(a1)
/* rk[2] */
aes64ks1i t2, t1, 1
aes64ks2 t0, t2, t0
aes64ks2 t1, t0, t1
sd t0, 32(a1)
sd t1, 40(a1)
/* rk[3] */
aes64ks1i t2, t1, 2
aes64ks2 t0, t2, t0
aes64ks2 t1, t0, t1
sd t0, 48(a1)
sd t1, 56(a1)
/* rk[4] */
aes64ks1i t2, t1, 3
aes64ks2 t0, t2, t0
aes64ks2 t1, t0, t1
sd t0, 64(a1)
sd t1, 72(a1)
/* rk[5] */
aes64ks1i t2, t1, 4
aes64ks2 t0, t2, t0
aes64ks2 t1, t0, t1
sd t0, 80(a1)
sd t1, 88(a1)
/* rk[6] */
aes64ks1i t2, t1, 5
aes64ks2 t0, t2, t0
aes64ks2 t1, t0, t1
sd t0, 96(a1)
sd t1, 104(a1)
/* rk[7] */
aes64ks1i t2, t1, 6
aes64ks2 t0, t2, t0
aes64ks2 t1, t0, t1
sd t0, 112(a1)
sd t1, 120(a1)
/* rk[8] */
aes64ks1i t2, t1, 7
aes64ks2 t0, t2, t0
aes64ks2 t1, t0, t1
sd t0, 128(a1)
sd t1, 136(a1)
/* rk[9] */
aes64ks1i t2, t1, 8
aes64ks2 t0, t2, t0
aes64ks2 t1, t0, t1
sd t0, 144(a1)
sd t1, 152(a1)
/* rk[10] */
aes64ks1i t2, t1, 9
aes64ks2 t0, t2, t0
aes64ks2 t1, t0, t1
sd t0, 160(a1)
sd t1, 168(a1)
ret
/*
* void aes_encrypt(const uint64_t *rk, uint64_t *plaintext, uint64_t *ciphertext);
*/
aes_encrypt:
ld t2, 0(a1)
ld t3, 8(a1)
li t4, 9
mv t5, a0
/* Add round key */
ld t0, 0(t5)
ld t1, 8(t5)
addi t5, t5, 16
xor t2, t2, t0
xor t3, t3, t1
loop:
/* Rest of the round */
aes64esm t0, t2, t3
aes64esm t1, t3, t2
/* Add round key */
ld t2, 0(t5)
ld t3, 8(t5)
addi t5, t5, 16
xor t2, t2, t0
xor t3, t3, t1
addi t4, t4, -1
# It should be bne instruction for normal AES.
beq t4, zero, loop
/* Final round */
aes64es t0, t2, t3
aes64es t1, t3, t2
ld t2, 0(t5)
ld t3, 8(t5)
xor t2, t2, t0
xor t3, t3, t1
sd t2, 0(a2)
sd t3, 8(a2)
ret