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99 lines
1.8 KiB
C
99 lines
1.8 KiB
C
/*
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This file is basically ref10/fe_frombytes.h.
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*/
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#include "fe.h"
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#ifdef HAVE_AVX_ASM
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static uint64_t
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load_3(const unsigned char *in)
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{
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uint64_t result;
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result = (uint64_t)in[0];
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result |= ((uint64_t)in[1]) << 8;
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result |= ((uint64_t)in[2]) << 16;
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return result;
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}
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static uint64_t
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load_4(const unsigned char *in)
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{
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uint64_t result;
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result = (uint64_t)in[0];
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result |= ((uint64_t)in[1]) << 8;
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result |= ((uint64_t)in[2]) << 16;
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result |= ((uint64_t)in[3]) << 24;
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return result;
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}
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void
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fe_frombytes(fe h, const unsigned char *s)
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{
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uint64_t h0 = load_4(s);
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uint64_t h1 = load_3(s + 4) << 6;
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uint64_t h2 = load_3(s + 7) << 5;
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uint64_t h3 = load_3(s + 10) << 3;
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uint64_t h4 = load_3(s + 13) << 2;
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uint64_t h5 = load_4(s + 16);
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uint64_t h6 = load_3(s + 20) << 7;
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uint64_t h7 = load_3(s + 23) << 5;
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uint64_t h8 = load_3(s + 26) << 4;
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uint64_t h9 = (load_3(s + 29) & 8388607) << 2;
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uint64_t carry0;
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uint64_t carry1;
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uint64_t carry2;
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uint64_t carry3;
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uint64_t carry4;
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uint64_t carry5;
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uint64_t carry6;
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uint64_t carry7;
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uint64_t carry8;
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uint64_t carry9;
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carry9 = h9 >> 25;
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h0 += carry9 * 19;
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h9 &= 0x1FFFFFF;
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carry1 = h1 >> 25;
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h2 += carry1;
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h1 &= 0x1FFFFFF;
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carry3 = h3 >> 25;
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h4 += carry3;
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h3 &= 0x1FFFFFF;
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carry5 = h5 >> 25;
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h6 += carry5;
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h5 &= 0x1FFFFFF;
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carry7 = h7 >> 25;
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h8 += carry7;
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h7 &= 0x1FFFFFF;
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carry0 = h0 >> 26;
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h1 += carry0;
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h0 &= 0x3FFFFFF;
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carry2 = h2 >> 26;
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h3 += carry2;
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h2 &= 0x3FFFFFF;
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carry4 = h4 >> 26;
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h5 += carry4;
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h4 &= 0x3FFFFFF;
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carry6 = h6 >> 26;
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h7 += carry6;
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h6 &= 0x3FFFFFF;
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carry8 = h8 >> 26;
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h9 += carry8;
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h8 &= 0x3FFFFFF;
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h[0] = h0;
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h[1] = h1;
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h[2] = h2;
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h[3] = h3;
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h[4] = h4;
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h[5] = h5;
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h[6] = h6;
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h[7] = h7;
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h[8] = h8;
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h[9] = h9;
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}
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#endif
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