71 lines
1.3 KiB
C
71 lines
1.3 KiB
C
#if !defined(SCRYPT_CHOOSE_COMPILETIME) || !defined(SCRYPT_SALSA_INCLUDED)
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#undef SCRYPT_MIX
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#define SCRYPT_MIX "Salsa20/8 Ref"
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#undef SCRYPT_SALSA_INCLUDED
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#define SCRYPT_SALSA_INCLUDED
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#define SCRYPT_SALSA_BASIC
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static void
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salsa_core_basic(uint32_t state[16]) {
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size_t rounds = 8;
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uint32_t x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15,t;
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x0 = state[0];
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x1 = state[1];
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x2 = state[2];
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x3 = state[3];
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x4 = state[4];
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x5 = state[5];
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x6 = state[6];
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x7 = state[7];
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x8 = state[8];
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x9 = state[9];
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x10 = state[10];
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x11 = state[11];
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x12 = state[12];
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x13 = state[13];
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x14 = state[14];
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x15 = state[15];
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#define quarter(a,b,c,d) \
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t = a+d; t = ROTL32(t, 7); b ^= t; \
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t = b+a; t = ROTL32(t, 9); c ^= t; \
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t = c+b; t = ROTL32(t, 13); d ^= t; \
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t = d+c; t = ROTL32(t, 18); a ^= t; \
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for (; rounds; rounds -= 2) {
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quarter( x0, x4, x8,x12)
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quarter( x5, x9,x13, x1)
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quarter(x10,x14, x2, x6)
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quarter(x15, x3, x7,x11)
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quarter( x0, x1, x2, x3)
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quarter( x5, x6, x7, x4)
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quarter(x10,x11, x8, x9)
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quarter(x15,x12,x13,x14)
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}
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state[0] += x0;
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state[1] += x1;
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state[2] += x2;
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state[3] += x3;
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state[4] += x4;
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state[5] += x5;
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state[6] += x6;
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state[7] += x7;
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state[8] += x8;
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state[9] += x9;
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state[10] += x10;
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state[11] += x11;
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state[12] += x12;
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state[13] += x13;
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state[14] += x14;
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state[15] += x15;
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#undef quarter
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}
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#endif
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