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chacha-avx2.c
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chacha-avx2.c
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#if defined(SUPERCOP)
#include "crypto_stream.h"
#endif
#include <stdint.h>
#include <string.h>
#include <immintrin.h>
/* Default to 20 rounds */
#if !defined(CHACHA_ROUNDS)
#define CHACHA_ROUNDS 20
#endif
#if 0 != (CHACHA_ROUNDS % 2)
#error "I only accept an even number of rounds!"
#endif
/* Some aliases to keep code below somewhat sane */
#define LOADU(m) _mm256_loadu_si256((const __m256i *)(m))
#define STOREU(m, v) _mm256_storeu_si256((__m256i*)(m), (v))
#define TO128(x) _mm256_castsi256_si128(x)
#define ADD(A, B) _mm256_add_epi32(A, B)
#define SUB(A, B) _mm256_sub_epi32(A, B)
#define XOR(A, B) _mm256_xor_si256(A, B)
#define ROT(X, C) \
( \
(C) == 8 ? _mm256_shuffle_epi8((X), _mm256_set_epi8(14,13,12,15,10,9,8,11,6,5,4,7,2,1,0,3, \
14,13,12,15,10,9,8,11,6,5,4,7,2,1,0,3)) \
: (C) == 16 ? _mm256_shuffle_epi8((X), _mm256_set_epi8(13,12,15,14,9,8,11,10,5,4,7,6,1,0,3,2, \
13,12,15,14,9,8,11,10,5,4,7,6,1,0,3,2)) \
: /* else */ _mm256_or_si256(_mm256_slli_epi32((X), (C)), _mm256_srli_epi32((X), 32 - (C))) \
)
#if defined(MANUAL_SCHEDULING) /* Behaves better on clang 3.3, worse on gcc, icc */
#define DOUBLE_ROUND(x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15) \
do \
{ \
/* Column round */ \
x0 = ADD( x0, x4); x1 = ADD( x1, x5); x2 = ADD( x2, x6); x3 = ADD( x3, x7); \
x12 = XOR(x12, x0); x13 = XOR(x13, x1); x14 = XOR(x14, x2); x15 = XOR(x15, x3); \
x12 = ROT(x12, 16); x13 = ROT(x13, 16); x14 = ROT(x14, 16); x15 = ROT(x15, 16); \
x8 = ADD( x8, x12); x9 = ADD( x9, x13); x10 = ADD(x10, x14); x11 = ADD(x11, x15); \
x4 = XOR( x4, x8); x5 = XOR( x5, x9); x6 = XOR( x6, x10); x7 = XOR( x7, x11); \
x4 = ROT( x4, 12); x5 = ROT( x5, 12); x6 = ROT( x6, 12); x7 = ROT( x7, 12); \
x0 = ADD( x0, x4); x1 = ADD( x1, x5); x2 = ADD( x2, x6); x3 = ADD( x3, x7); \
x12 = XOR(x12, x0); x13 = XOR(x13, x1); x14 = XOR(x14, x2); x15 = XOR(x15, x3); \
x12 = ROT(x12, 8); x13 = ROT(x13, 8); x14 = ROT(x14, 8); x15 = ROT(x15, 8); \
x8 = ADD( x8, x12); x9 = ADD( x9, x13); x10 = ADD(x10, x14); x11 = ADD(x11, x15); \
x4 = XOR( x4, x8); x5 = XOR( x5, x9); x6 = XOR( x6, x10); x7 = XOR( x7, x11); \
x4 = ROT( x4, 7); x5 = ROT( x5, 7); x6 = ROT( x6, 7); x7 = ROT( x7, 7); \
/* Diagonal round */ \
x0 = ADD( x0, x5); x1 = ADD( x1, x6); x2 = ADD( x2, x7); x3 = ADD( x3, x4); \
x15 = XOR(x15, x0); x12 = XOR(x12, x1); x13 = XOR(x13, x2); x14 = XOR(x14, x3); \
x15 = ROT(x15, 16); x12 = ROT(x12, 16); x13 = ROT(x13, 16); x14 = ROT(x14, 16); \
x10 = ADD(x10, x15); x11 = ADD(x11, x12); x8 = ADD( x8, x13); x9 = ADD( x9, x14); \
x5 = XOR( x5, x10); x6 = XOR( x6, x11); x7 = XOR( x7, x8); x4 = XOR( x4, x9); \
x5 = ROT( x5, 12); x6 = ROT( x6, 12); x7 = ROT( x7, 12); x4 = ROT( x4, 12); \
x0 = ADD( x0, x5); x1 = ADD( x1, x6); x2 = ADD( x2, x7); x3 = ADD( x3, x4); \
x15 = XOR(x15, x0); x12 = XOR(x12, x1); x13 = XOR(x13, x2); x14 = XOR(x14, x3); \
x15 = ROT(x15, 8); x12 = ROT(x12, 8); x13 = ROT(x13, 8); x14 = ROT(x14, 8); \
x10 = ADD(x10, x15); x11 = ADD(x11, x12); x8 = ADD( x8, x13); x9 = ADD( x9, x14); \
x5 = XOR( x5, x10); x6 = XOR( x6, x11); x7 = XOR( x7, x8); x4 = XOR( x4, x9); \
x5 = ROT( x5, 7); x6 = ROT( x6, 7); x7 = ROT( x7, 7); x4 = ROT( x4, 7); \
} while(0)
#else
#define QUARTER_ROUND(A, B, C, D) \
do \
{ \
A = ADD(A, B); D = XOR(D, A); D = ROT(D, 16); \
C = ADD(C, D); B = XOR(B, C); B = ROT(B, 12); \
A = ADD(A, B); D = XOR(D, A); D = ROT(D, 8); \
C = ADD(C, D); B = XOR(B, C); B = ROT(B, 7); \
} while(0)
#define DOUBLE_ROUND(x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15) \
do \
{ \
/* Column round */ \
QUARTER_ROUND(x0, x4, x8, x12); \
QUARTER_ROUND(x1, x5, x9, x13); \
QUARTER_ROUND(x2, x6, x10, x14); \
QUARTER_ROUND(x3, x7, x11, x15); \
/* Diagonal round */ \
QUARTER_ROUND(x0, x5, x10, x15); \
QUARTER_ROUND(x1, x6, x11, x12); \
QUARTER_ROUND(x2, x7, x8, x13); \
QUARTER_ROUND(x3, x4, x9, x14); \
} while(0)
#endif
#define CHACHA_CORE(z0,z1,z2,z3,z4,z5,z6,z7,z8,z9,z10,z11,z12,z13,z14,z15, \
x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15) \
do \
{ \
int i; \
z0 = x0, z1 = x1, z2 = x2, z3 = x3, \
z4 = x4, z5 = x5, z6 = x6, z7 = x7, \
z8 = x8, z9 = x9,z10 = x10,z11 = x11, \
z12 = x12,z13 = x13,z14 = x14,z15 = x15; \
for(i = 0; i < CHACHA_ROUNDS; i += 2) \
DOUBLE_ROUND(z0,z1,z2,z3,z4,z5,z6,z7,z8,z9,z10,z11,z12,z13,z14,z15); \
\
z0 = ADD( x0, z0); \
z1 = ADD( x1, z1); \
z2 = ADD( x2, z2); \
z3 = ADD( x3, z3); \
z4 = ADD( x4, z4); \
z5 = ADD( x5, z5); \
z6 = ADD( x6, z6); \
z7 = ADD( x7, z7); \
z8 = ADD( x8, z8); \
z9 = ADD( x9, z9); \
z10 = ADD(x10, z10); \
z11 = ADD(x11, z11); \
z12 = ADD(x12, z12); \
z13 = ADD(x13, z13); \
z14 = ADD(x14, z14); \
z15 = ADD(x15, z15); \
} while(0)
/* Probably not the best it can be... */
#define TRANSPOSE(x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15) \
do \
{ \
__m256i t0,t1,t2,t3,t4,t5,t6,t7; \
__m256i t8,t9,t10,t11,t12,t13,t14,t15; \
__m256i s0,s1,s2,s3,s4,s5,s6,s7; \
__m256i s8,s9,s10,s11,s12,s13,s14,s15; \
\
t0 = _mm256_unpacklo_epi32( x0, x1); \
t1 = _mm256_unpackhi_epi32( x0, x1); \
t2 = _mm256_unpacklo_epi32( x2, x3); \
t3 = _mm256_unpackhi_epi32( x2, x3); \
t4 = _mm256_unpacklo_epi32( x4, x5); \
t5 = _mm256_unpackhi_epi32( x4, x5); \
t6 = _mm256_unpacklo_epi32( x6, x7); \
t7 = _mm256_unpackhi_epi32( x6, x7); \
t8 = _mm256_unpacklo_epi32( x8, x9); \
t9 = _mm256_unpackhi_epi32( x8, x9); \
t10 = _mm256_unpacklo_epi32(x10, x11); \
t11 = _mm256_unpackhi_epi32(x10, x11); \
t12 = _mm256_unpacklo_epi32(x12, x13); \
t13 = _mm256_unpackhi_epi32(x12, x13); \
t14 = _mm256_unpacklo_epi32(x14, x15); \
t15 = _mm256_unpackhi_epi32(x14, x15); \
\
s0 = _mm256_unpacklo_epi64( t0, t2); \
s1 = _mm256_unpackhi_epi64( t0, t2); \
s2 = _mm256_unpacklo_epi64( t1, t3); \
s3 = _mm256_unpackhi_epi64( t1, t3); \
s4 = _mm256_unpacklo_epi64( t4, t6); \
s5 = _mm256_unpackhi_epi64( t4, t6); \
s6 = _mm256_unpacklo_epi64( t5, t7); \
s7 = _mm256_unpackhi_epi64( t5, t7); \
s8 = _mm256_unpacklo_epi64( t8, t10); \
s9 = _mm256_unpackhi_epi64( t8, t10); \
s10 = _mm256_unpacklo_epi64( t9, t11); \
s11 = _mm256_unpackhi_epi64( t9, t11); \
s12 = _mm256_unpacklo_epi64(t12, t14); \
s13 = _mm256_unpackhi_epi64(t12, t14); \
s14 = _mm256_unpacklo_epi64(t13, t15); \
s15 = _mm256_unpackhi_epi64(t13, t15); \
\
x0 = _mm256_permute2x128_si256( s0, s4, 0x20); \
x8 = _mm256_permute2x128_si256( s0, s4, 0x31); \
x1 = _mm256_permute2x128_si256( s8, s12, 0x20); \
x9 = _mm256_permute2x128_si256( s8, s12, 0x31); \
x2 = _mm256_permute2x128_si256( s1, s5, 0x20); \
x10 = _mm256_permute2x128_si256( s1, s5, 0x31); \
x3 = _mm256_permute2x128_si256( s9, s13, 0x20); \
x11 = _mm256_permute2x128_si256( s9, s13, 0x31); \
x4 = _mm256_permute2x128_si256( s2, s6, 0x20); \
x12 = _mm256_permute2x128_si256( s2, s6, 0x31); \
x5 = _mm256_permute2x128_si256(s10, s14, 0x20); \
x13 = _mm256_permute2x128_si256(s10, s14, 0x31); \
x6 = _mm256_permute2x128_si256( s3, s7, 0x20); \
x14 = _mm256_permute2x128_si256( s3, s7, 0x31); \
x7 = _mm256_permute2x128_si256(s11, s15, 0x20); \
x15 = _mm256_permute2x128_si256(s11, s15, 0x31); \
} while(0)
#define CHACHA_OUT(out,in,x0,x1, x2, x3, x4, x5, x6, x7, \
x8,x9,x10,x11,x12,x13,x14,x15) \
do \
{ \
TRANSPOSE(x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15); \
STOREU(out + 0, XOR( x0, LOADU(in + 0))); \
STOREU(out + 32, XOR( x1, LOADU(in + 32))); \
STOREU(out + 64, XOR( x2, LOADU(in + 64))); \
STOREU(out + 96, XOR( x3, LOADU(in + 96))); \
STOREU(out + 128, XOR( x4, LOADU(in + 128))); \
STOREU(out + 160, XOR( x5, LOADU(in + 160))); \
STOREU(out + 192, XOR( x6, LOADU(in + 192))); \
STOREU(out + 224, XOR( x7, LOADU(in + 224))); \
STOREU(out + 256, XOR( x8, LOADU(in + 256))); \
STOREU(out + 288, XOR( x9, LOADU(in + 288))); \
STOREU(out + 320, XOR(x10, LOADU(in + 320))); \
STOREU(out + 352, XOR(x11, LOADU(in + 352))); \
STOREU(out + 384, XOR(x12, LOADU(in + 384))); \
STOREU(out + 416, XOR(x13, LOADU(in + 416))); \
STOREU(out + 448, XOR(x14, LOADU(in + 448))); \
STOREU(out + 480, XOR(x15, LOADU(in + 480))); \
} while(0)
int crypto_stream_xor(unsigned char *out, const unsigned char *in,
unsigned long long inlen, const unsigned char *n_, const unsigned char *k_)
{
__m256i x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15;
__m256i z0,z1,z2,z3,z4,z5,z6,z7,z8,z9,z10,z11,z12,z13,z14,z15;
uint32_t k[8];
uint32_t n[2];
memcpy(k, k_, 32);
memcpy(n, n_, 8);
x0 = _mm256_set1_epi32(0x61707865);
x1 = _mm256_set1_epi32(0x3320646e);
x2 = _mm256_set1_epi32(0x79622d32);
x3 = _mm256_set1_epi32(0x6b206574);
x4 = _mm256_set1_epi32(k[0]);
x5 = _mm256_set1_epi32(k[1]);
x6 = _mm256_set1_epi32(k[2]);
x7 = _mm256_set1_epi32(k[3]);
x8 = _mm256_set1_epi32(k[4]);
x9 = _mm256_set1_epi32(k[5]);
x10 = _mm256_set1_epi32(k[6]);
x11 = _mm256_set1_epi32(k[7]);
x12 = _mm256_set_epi32(7,6,5,4,3,2,1,0);
x13 = _mm256_setzero_si256();
x14 = _mm256_set1_epi32(n[0]);
x15 = _mm256_set1_epi32(n[1]);
while(inlen >= 512)
{
CHACHA_CORE(z0,z1,z2,z3,z4,z5,z6,z7,z8,z9,z10,z11,z12,z13,z14,z15,\
x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15);
CHACHA_OUT(out,in,z0,z1,z2,z3,z4,z5,z6,z7,z8,z9,z10,z11,z12,z13,z14,z15);
x13 = SUB(x13, _mm256_cmpeq_epi32(x12, _mm256_set_epi32(-1,-2,-3,-4,-5,-6,-7,-8)));
x12 = ADD(x12, _mm256_set1_epi32(8));
out += 512; in += 512; inlen -= 512;
}
if(inlen > 0) /* Should fallback to latency-oriented implementation here */
{
unsigned char blk[512];
memcpy(blk, in, inlen);
CHACHA_CORE(z0,z1,z2,z3,z4,z5,z6,z7,z8,z9,z10,z11,z12,z13,z14,z15,\
x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15);
CHACHA_OUT(blk,blk,z0,z1,z2,z3,z4,z5,z6,z7,z8,z9,z10,z11,z12,z13,z14,z15);
memcpy(out, blk, inlen);
}
return 0;
}
int crypto_stream(unsigned char *out, unsigned long long outlen,
const unsigned char *n, const unsigned char *k)
{
memset(out, 0, outlen);
return crypto_stream_xor(out, out, outlen, n, k);
}