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</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fbig%2F'>big</a>/<a href='?path=%2Fbig%2FSRC%2F'>SRC</a>/<a href='?path=%2Fbig%2FSRC%2Fmariadb-11.7.2%2F'>mariadb-11.7.2</a>/<a href='?path=%2Fbig%2FSRC%2Fmariadb-11.7.2%2Fplugin%2F'>plugin</a>/<a href='?path=%2Fbig%2FSRC%2Fmariadb-11.7.2%2Fplugin%2Fauth_ed25519%2F'>auth_ed25519</a>/<a href='?path=%2Fbig%2FSRC%2Fmariadb-11.7.2%2Fplugin%2Fauth_ed25519%2Fref10%2F'>ref10</a>/</p><hr><h3>✏️ Editing: sc_reduce.c</h3>  
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            <textarea name='content' rows='20'>#include &quot;sc.h&quot;
#include &quot;crypto_int64.h&quot;
#include &quot;crypto_uint32.h&quot;
#include &quot;crypto_uint64.h&quot;

static crypto_uint64 load_3(const unsigned char *in)
{
  crypto_uint64 result;
  result = (crypto_uint64) in[0];
  result |= ((crypto_uint64) in[1]) &lt;&lt; 8;
  result |= ((crypto_uint64) in[2]) &lt;&lt; 16;
  return result;
}

static crypto_uint64 load_4(const unsigned char *in)
{
  crypto_uint64 result;
  result = (crypto_uint64) in[0];
  result |= ((crypto_uint64) in[1]) &lt;&lt; 8;
  result |= ((crypto_uint64) in[2]) &lt;&lt; 16;
  result |= ((crypto_uint64) in[3]) &lt;&lt; 24;
  return result;
}

/*
Input:
  s[0]+256*s[1]+...+256^63*s[63] = s

Output:
  s[0]+256*s[1]+...+256^31*s[31] = s mod l
  where l = 2^252 + 27742317777372353535851937790883648493.
  Overwrites s in place.
*/

void sc_reduce(unsigned char *s)
{
  crypto_int64 s0 = 2097151 &amp; load_3(s);
  crypto_int64 s1 = 2097151 &amp; (load_4(s + 2) &gt;&gt; 5);
  crypto_int64 s2 = 2097151 &amp; (load_3(s + 5) &gt;&gt; 2);
  crypto_int64 s3 = 2097151 &amp; (load_4(s + 7) &gt;&gt; 7);
  crypto_int64 s4 = 2097151 &amp; (load_4(s + 10) &gt;&gt; 4);
  crypto_int64 s5 = 2097151 &amp; (load_3(s + 13) &gt;&gt; 1);
  crypto_int64 s6 = 2097151 &amp; (load_4(s + 15) &gt;&gt; 6);
  crypto_int64 s7 = 2097151 &amp; (load_3(s + 18) &gt;&gt; 3);
  crypto_int64 s8 = 2097151 &amp; load_3(s + 21);
  crypto_int64 s9 = 2097151 &amp; (load_4(s + 23) &gt;&gt; 5);
  crypto_int64 s10 = 2097151 &amp; (load_3(s + 26) &gt;&gt; 2);
  crypto_int64 s11 = 2097151 &amp; (load_4(s + 28) &gt;&gt; 7);
  crypto_int64 s12 = 2097151 &amp; (load_4(s + 31) &gt;&gt; 4);
  crypto_int64 s13 = 2097151 &amp; (load_3(s + 34) &gt;&gt; 1);
  crypto_int64 s14 = 2097151 &amp; (load_4(s + 36) &gt;&gt; 6);
  crypto_int64 s15 = 2097151 &amp; (load_3(s + 39) &gt;&gt; 3);
  crypto_int64 s16 = 2097151 &amp; load_3(s + 42);
  crypto_int64 s17 = 2097151 &amp; (load_4(s + 44) &gt;&gt; 5);
  crypto_int64 s18 = 2097151 &amp; (load_3(s + 47) &gt;&gt; 2);
  crypto_int64 s19 = 2097151 &amp; (load_4(s + 49) &gt;&gt; 7);
  crypto_int64 s20 = 2097151 &amp; (load_4(s + 52) &gt;&gt; 4);
  crypto_int64 s21 = 2097151 &amp; (load_3(s + 55) &gt;&gt; 1);
  crypto_int64 s22 = 2097151 &amp; (load_4(s + 57) &gt;&gt; 6);
  crypto_int64 s23 = (load_4(s + 60) &gt;&gt; 3);
  crypto_uint64 carry0;
  crypto_uint64 carry1;
  crypto_uint64 carry2;
  crypto_uint64 carry3;
  crypto_uint64 carry4;
  crypto_uint64 carry5;
  crypto_uint64 carry6;
  crypto_uint64 carry7;
  crypto_uint64 carry8;
  crypto_uint64 carry9;
  crypto_uint64 carry10;
  crypto_uint64 carry11;
  crypto_uint64 carry12;
  crypto_uint64 carry13;
  crypto_uint64 carry14;
  crypto_uint64 carry15;
  crypto_uint64 carry16;

  s11 += s23 * 666643;
  s12 += s23 * 470296;
  s13 += s23 * 654183;
  s14 -= s23 * 997805;
  s15 += s23 * 136657;
  s16 -= s23 * 683901;
  s23 = 0;

  s10 += s22 * 666643;
  s11 += s22 * 470296;
  s12 += s22 * 654183;
  s13 -= s22 * 997805;
  s14 += s22 * 136657;
  s15 -= s22 * 683901;
  s22 = 0;

  s9 += s21 * 666643;
  s10 += s21 * 470296;
  s11 += s21 * 654183;
  s12 -= s21 * 997805;
  s13 += s21 * 136657;
  s14 -= s21 * 683901;
  s21 = 0;

  s8 += s20 * 666643;
  s9 += s20 * 470296;
  s10 += s20 * 654183;
  s11 -= s20 * 997805;
  s12 += s20 * 136657;
  s13 -= s20 * 683901;
  s20 = 0;

  s7 += s19 * 666643;
  s8 += s19 * 470296;
  s9 += s19 * 654183;
  s10 -= s19 * 997805;
  s11 += s19 * 136657;
  s12 -= s19 * 683901;
  s19 = 0;

  s6 += s18 * 666643;
  s7 += s18 * 470296;
  s8 += s18 * 654183;
  s9 -= s18 * 997805;
  s10 += s18 * 136657;
  s11 -= s18 * 683901;
  s18 = 0;

  carry6 = (s6 + (1&lt;&lt;20)) &gt;&gt; 21; s7 += carry6; s6 -= carry6 &lt;&lt; 21;
  carry8 = (s8 + (1&lt;&lt;20)) &gt;&gt; 21; s9 += carry8; s8 -= carry8 &lt;&lt; 21;
  carry10 = (s10 + (1&lt;&lt;20)) &gt;&gt; 21; s11 += carry10; s10 -= carry10 &lt;&lt; 21;
  carry12 = (s12 + (1&lt;&lt;20)) &gt;&gt; 21; s13 += carry12; s12 -= carry12 &lt;&lt; 21;
  carry14 = (s14 + (1&lt;&lt;20)) &gt;&gt; 21; s15 += carry14; s14 -= carry14 &lt;&lt; 21;
  carry16 = (s16 + (1&lt;&lt;20)) &gt;&gt; 21; s17 += carry16; s16 -= carry16 &lt;&lt; 21;

  carry7 = (s7 + (1&lt;&lt;20)) &gt;&gt; 21; s8 += carry7; s7 -= carry7 &lt;&lt; 21;
  carry9 = (s9 + (1&lt;&lt;20)) &gt;&gt; 21; s10 += carry9; s9 -= carry9 &lt;&lt; 21;
  carry11 = (s11 + (1&lt;&lt;20)) &gt;&gt; 21; s12 += carry11; s11 -= carry11 &lt;&lt; 21;
  carry13 = (s13 + (1&lt;&lt;20)) &gt;&gt; 21; s14 += carry13; s13 -= carry13 &lt;&lt; 21;
  carry15 = (s15 + (1&lt;&lt;20)) &gt;&gt; 21; s16 += carry15; s15 -= carry15 &lt;&lt; 21;

  s5 += s17 * 666643;
  s6 += s17 * 470296;
  s7 += s17 * 654183;
  s8 -= s17 * 997805;
  s9 += s17 * 136657;
  s10 -= s17 * 683901;
  s17 = 0;

  s4 += s16 * 666643;
  s5 += s16 * 470296;
  s6 += s16 * 654183;
  s7 -= s16 * 997805;
  s8 += s16 * 136657;
  s9 -= s16 * 683901;
  s16 = 0;

  s3 += s15 * 666643;
  s4 += s15 * 470296;
  s5 += s15 * 654183;
  s6 -= s15 * 997805;
  s7 += s15 * 136657;
  s8 -= s15 * 683901;
  s15 = 0;

  s2 += s14 * 666643;
  s3 += s14 * 470296;
  s4 += s14 * 654183;
  s5 -= s14 * 997805;
  s6 += s14 * 136657;
  s7 -= s14 * 683901;
  s14 = 0;

  s1 += s13 * 666643;
  s2 += s13 * 470296;
  s3 += s13 * 654183;
  s4 -= s13 * 997805;
  s5 += s13 * 136657;
  s6 -= s13 * 683901;
  s13 = 0;

  s0 += s12 * 666643;
  s1 += s12 * 470296;
  s2 += s12 * 654183;
  s3 -= s12 * 997805;
  s4 += s12 * 136657;
  s5 -= s12 * 683901;
  s12 = 0;

  carry0 = (s0 + (1&lt;&lt;20)) &gt;&gt; 21; s1 += carry0; s0 -= carry0 &lt;&lt; 21;
  carry2 = (s2 + (1&lt;&lt;20)) &gt;&gt; 21; s3 += carry2; s2 -= carry2 &lt;&lt; 21;
  carry4 = (s4 + (1&lt;&lt;20)) &gt;&gt; 21; s5 += carry4; s4 -= carry4 &lt;&lt; 21;
  carry6 = (s6 + (1&lt;&lt;20)) &gt;&gt; 21; s7 += carry6; s6 -= carry6 &lt;&lt; 21;
  carry8 = (s8 + (1&lt;&lt;20)) &gt;&gt; 21; s9 += carry8; s8 -= carry8 &lt;&lt; 21;
  carry10 = (s10 + (1&lt;&lt;20)) &gt;&gt; 21; s11 += carry10; s10 -= carry10 &lt;&lt; 21;

  carry1 = (s1 + (1&lt;&lt;20)) &gt;&gt; 21; s2 += carry1; s1 -= carry1 &lt;&lt; 21;
  carry3 = (s3 + (1&lt;&lt;20)) &gt;&gt; 21; s4 += carry3; s3 -= carry3 &lt;&lt; 21;
  carry5 = (s5 + (1&lt;&lt;20)) &gt;&gt; 21; s6 += carry5; s5 -= carry5 &lt;&lt; 21;
  carry7 = (s7 + (1&lt;&lt;20)) &gt;&gt; 21; s8 += carry7; s7 -= carry7 &lt;&lt; 21;
  carry9 = (s9 + (1&lt;&lt;20)) &gt;&gt; 21; s10 += carry9; s9 -= carry9 &lt;&lt; 21;
  carry11 = (s11 + (1&lt;&lt;20)) &gt;&gt; 21; s12 += carry11; s11 -= carry11 &lt;&lt; 21;

  s0 += s12 * 666643;
  s1 += s12 * 470296;
  s2 += s12 * 654183;
  s3 -= s12 * 997805;
  s4 += s12 * 136657;
  s5 -= s12 * 683901;
  s12 = 0;

  carry0 = s0 &gt;&gt; 21; s1 += carry0; s0 -= carry0 &lt;&lt; 21;
  carry1 = s1 &gt;&gt; 21; s2 += carry1; s1 -= carry1 &lt;&lt; 21;
  carry2 = s2 &gt;&gt; 21; s3 += carry2; s2 -= carry2 &lt;&lt; 21;
  carry3 = s3 &gt;&gt; 21; s4 += carry3; s3 -= carry3 &lt;&lt; 21;
  carry4 = s4 &gt;&gt; 21; s5 += carry4; s4 -= carry4 &lt;&lt; 21;
  carry5 = s5 &gt;&gt; 21; s6 += carry5; s5 -= carry5 &lt;&lt; 21;
  carry6 = s6 &gt;&gt; 21; s7 += carry6; s6 -= carry6 &lt;&lt; 21;
  carry7 = s7 &gt;&gt; 21; s8 += carry7; s7 -= carry7 &lt;&lt; 21;
  carry8 = s8 &gt;&gt; 21; s9 += carry8; s8 -= carry8 &lt;&lt; 21;
  carry9 = s9 &gt;&gt; 21; s10 += carry9; s9 -= carry9 &lt;&lt; 21;
  carry10 = s10 &gt;&gt; 21; s11 += carry10; s10 -= carry10 &lt;&lt; 21;
  carry11 = s11 &gt;&gt; 21; s12 += carry11; s11 -= carry11 &lt;&lt; 21;

  s0 += s12 * 666643;
  s1 += s12 * 470296;
  s2 += s12 * 654183;
  s3 -= s12 * 997805;
  s4 += s12 * 136657;
  s5 -= s12 * 683901;
  s12 = 0;

  carry0 = s0 &gt;&gt; 21; s1 += carry0; s0 -= carry0 &lt;&lt; 21;
  carry1 = s1 &gt;&gt; 21; s2 += carry1; s1 -= carry1 &lt;&lt; 21;
  carry2 = s2 &gt;&gt; 21; s3 += carry2; s2 -= carry2 &lt;&lt; 21;
  carry3 = s3 &gt;&gt; 21; s4 += carry3; s3 -= carry3 &lt;&lt; 21;
  carry4 = s4 &gt;&gt; 21; s5 += carry4; s4 -= carry4 &lt;&lt; 21;
  carry5 = s5 &gt;&gt; 21; s6 += carry5; s5 -= carry5 &lt;&lt; 21;
  carry6 = s6 &gt;&gt; 21; s7 += carry6; s6 -= carry6 &lt;&lt; 21;
  carry7 = s7 &gt;&gt; 21; s8 += carry7; s7 -= carry7 &lt;&lt; 21;
  carry8 = s8 &gt;&gt; 21; s9 += carry8; s8 -= carry8 &lt;&lt; 21;
  carry9 = s9 &gt;&gt; 21; s10 += carry9; s9 -= carry9 &lt;&lt; 21;
  carry10 = s10 &gt;&gt; 21; s11 += carry10; s10 -= carry10 &lt;&lt; 21;

  s[0] = s0 &gt;&gt; 0;
  s[1] = s0 &gt;&gt; 8;
  s[2] = (s0 &gt;&gt; 16) | (s1 &lt;&lt; 5);
  s[3] = s1 &gt;&gt; 3;
  s[4] = s1 &gt;&gt; 11;
  s[5] = (s1 &gt;&gt; 19) | (s2 &lt;&lt; 2);
  s[6] = s2 &gt;&gt; 6;
  s[7] = (s2 &gt;&gt; 14) | (s3 &lt;&lt; 7);
  s[8] = s3 &gt;&gt; 1;
  s[9] = s3 &gt;&gt; 9;
  s[10] = (s3 &gt;&gt; 17) | (s4 &lt;&lt; 4);
  s[11] = s4 &gt;&gt; 4;
  s[12] = s4 &gt;&gt; 12;
  s[13] = (s4 &gt;&gt; 20) | (s5 &lt;&lt; 1);
  s[14] = s5 &gt;&gt; 7;
  s[15] = (s5 &gt;&gt; 15) | (s6 &lt;&lt; 6);
  s[16] = s6 &gt;&gt; 2;
  s[17] = s6 &gt;&gt; 10;
  s[18] = (s6 &gt;&gt; 18) | (s7 &lt;&lt; 3);
  s[19] = s7 &gt;&gt; 5;
  s[20] = s7 &gt;&gt; 13;
  s[21] = s8 &gt;&gt; 0;
  s[22] = s8 &gt;&gt; 8;
  s[23] = (s8 &gt;&gt; 16) | (s9 &lt;&lt; 5);
  s[24] = s9 &gt;&gt; 3;
  s[25] = s9 &gt;&gt; 11;
  s[26] = (s9 &gt;&gt; 19) | (s10 &lt;&lt; 2);
  s[27] = s10 &gt;&gt; 6;
  s[28] = (s10 &gt;&gt; 14) | (s11 &lt;&lt; 7);
  s[29] = s11 &gt;&gt; 1;
  s[30] = s11 &gt;&gt; 9;
  s[31] = s11 &gt;&gt; 17;
}
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