Line data Source code
1 : #include "fd_chacha20rng.h"
2 : #include "../../util/simd/fd_avx.h"
3 : #include <assert.h>
4 :
5 2126838560 : #define wu_rol16(a) wb_exch_adj_pair( (a) )
6 2126838560 : #define wu_rol12(a) wu_rol( (a), 12 )
7 2126838560 : #define wu_rol7(a) wu_rol( (a), 7 )
8 :
9 : static inline __attribute__((always_inline)) wu_t
10 2126838560 : wu_rol8( wu_t x ) {
11 2126838560 : wb_t const mask =
12 2126838560 : wb_bcast_hex( 3,0,1,2, 7,4,5,6, 11,8,9,10, 15,12,13,14 );
13 2126838560 : return _mm256_shuffle_epi8( x, mask );
14 2126838560 : }
15 :
16 : void
17 26585482 : fd_chacha20rng_refill_avx( fd_chacha20rng_t * rng ) {
18 :
19 26585482 : wu_t iv0 = wu_bcast( 0x61707865U );
20 26585482 : wu_t iv1 = wu_bcast( 0x3320646eU );
21 26585482 : wu_t iv2 = wu_bcast( 0x79622d32U );
22 26585482 : wu_t iv3 = wu_bcast( 0x6b206574U );
23 26585482 : wb_t key = wb_ld( rng->key );
24 26585482 : wu_t zero = wu_zero();
25 :
26 : /* Unpack key equivalent to:
27 :
28 : c4 = wu_bcast( (uint const *)(rng->key)[0] );
29 : c5 = wu_bcast( (uint const *)(rng->key)[1] );
30 : ...
31 : cB = wu_bcast( (uint const *)(rng->key)[7] ); */
32 :
33 26585482 : wu_t key_lo = _mm256_permute2x128_si256( key, key, 0x00 ); /* [0,1,2,3,0,1,2,3] */
34 26585482 : wu_t key_hi = _mm256_permute2x128_si256( key, key, 0x11 ); /* [4,5,6,7,4,5,6,7] */
35 26585482 : wu_t k0 = _mm256_shuffle_epi32( key_lo, 0x00 );
36 26585482 : wu_t k1 = _mm256_shuffle_epi32( key_lo, 0x55 );
37 26585482 : wu_t k2 = _mm256_shuffle_epi32( key_lo, 0xaa );
38 26585482 : wu_t k3 = _mm256_shuffle_epi32( key_lo, 0xff );
39 26585482 : wu_t k4 = _mm256_shuffle_epi32( key_hi, 0x00 );
40 26585482 : wu_t k5 = _mm256_shuffle_epi32( key_hi, 0x55 );
41 26585482 : wu_t k6 = _mm256_shuffle_epi32( key_hi, 0xaa );
42 26585482 : wu_t k7 = _mm256_shuffle_epi32( key_hi, 0xff );
43 :
44 : /* Derive block index */
45 :
46 26585482 : ulong idx = rng->buf_fill / FD_CHACHA20_BLOCK_SZ; /* really a right shift */
47 26585482 : wu_t idxs = wu_add( wu_bcast( idx ), wu( 0, 1, 2, 3, 4, 5, 6, 7 ) );
48 :
49 : /* Run through the round function */
50 :
51 26585482 : wu_t c0 = iv0; wu_t c1 = iv1; wu_t c2 = iv2; wu_t c3 = iv3;
52 26585482 : wu_t c4 = k0; wu_t c5 = k1; wu_t c6 = k2; wu_t c7 = k3;
53 26585482 : wu_t c8 = k4; wu_t c9 = k5; wu_t cA = k6; wu_t cB = k7;
54 26585482 : wu_t cC = idxs; wu_t cD = zero; wu_t cE = zero; wu_t cF = zero;
55 :
56 26585482 : # define QUARTER_ROUND(a,b,c,d) \
57 2126838560 : do { \
58 2126838560 : a = wu_add( a, b ); d = wu_xor( d, a ); d = wu_rol16( d ); \
59 2126838560 : c = wu_add( c, d ); b = wu_xor( b, c ); b = wu_rol12( b ); \
60 2126838560 : a = wu_add( a, b ); d = wu_xor( d, a ); d = wu_rol8( d ); \
61 2126838560 : c = wu_add( c, d ); b = wu_xor( b, c ); b = wu_rol7( b ); \
62 2126838560 : } while(0)
63 :
64 292440302 : for( ulong i=0UL; i<10UL; i++ ) {
65 265854820 : QUARTER_ROUND( c0, c4, c8, cC );
66 265854820 : QUARTER_ROUND( c1, c5, c9, cD );
67 265854820 : QUARTER_ROUND( c2, c6, cA, cE );
68 265854820 : QUARTER_ROUND( c3, c7, cB, cF );
69 265854820 : QUARTER_ROUND( c0, c5, cA, cF );
70 265854820 : QUARTER_ROUND( c1, c6, cB, cC );
71 265854820 : QUARTER_ROUND( c2, c7, c8, cD );
72 265854820 : QUARTER_ROUND( c3, c4, c9, cE );
73 265854820 : }
74 26585482 : # undef QUARTER_ROUND
75 :
76 : /* Finalize */
77 :
78 26585482 : c0 = wu_add( c0, iv0 );
79 26585482 : c1 = wu_add( c1, iv1 );
80 26585482 : c2 = wu_add( c2, iv2 );
81 26585482 : c3 = wu_add( c3, iv3 );
82 26585482 : c4 = wu_add( c4, k0 );
83 26585482 : c5 = wu_add( c5, k1 );
84 26585482 : c6 = wu_add( c6, k2 );
85 26585482 : c7 = wu_add( c7, k3 );
86 26585482 : c8 = wu_add( c8, k4 );
87 26585482 : c9 = wu_add( c9, k5 );
88 26585482 : cA = wu_add( cA, k6 );
89 26585482 : cB = wu_add( cB, k7 );
90 26585482 : cC = wu_add( cC, idxs );
91 : //cD = wu_add( cD, zero );
92 : //cE = wu_add( cE, zero );
93 : //cF = wu_add( cF, zero );
94 :
95 : /* Transpose matrix to get output vector */
96 :
97 26585482 : wu_transpose_8x8( c0, c1, c2, c3, c4, c5, c6, c7,
98 26585482 : c0, c1, c2, c3, c4, c5, c6, c7 );
99 26585482 : wu_transpose_8x8( c8, c9, cA, cB, cC, cD, cE, cF,
100 26585482 : c8, c9, cA, cB, cC, cD, cE, cF );
101 :
102 : /* Update ring buffer */
103 :
104 26585482 : ulong slot = rng->buf_fill % (8*FD_CHACHA20_BLOCK_SZ);
105 26585482 : uint * out = (uint *)rng->buf + (slot*2*FD_CHACHA20_BLOCK_SZ);
106 26585482 : wu_st( out+0x00, c0 ); wu_st( out+0x08, c8 );
107 26585482 : wu_st( out+0x10, c1 ); wu_st( out+0x18, c9 );
108 26585482 : wu_st( out+0x20, c2 ); wu_st( out+0x28, cA );
109 26585482 : wu_st( out+0x30, c3 ); wu_st( out+0x38, cB );
110 26585482 : wu_st( out+0x40, c4 ); wu_st( out+0x48, cC );
111 26585482 : wu_st( out+0x50, c5 ); wu_st( out+0x58, cD );
112 26585482 : wu_st( out+0x60, c6 ); wu_st( out+0x68, cE );
113 26585482 : wu_st( out+0x70, c7 ); wu_st( out+0x78, cF );
114 :
115 : /* Update ring descriptor */
116 :
117 26585482 : rng->buf_fill += 8*FD_CHACHA20_BLOCK_SZ;
118 26585482 : }
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