in src/crypto/curve25519/curve25519.c [1398:1877]
static void sc_muladd(uint8_t *s, const uint8_t *a, const uint8_t *b,
const uint8_t *c) {
int64_t a0 = 2097151 & load_3(a);
int64_t a1 = 2097151 & (load_4(a + 2) >> 5);
int64_t a2 = 2097151 & (load_3(a + 5) >> 2);
int64_t a3 = 2097151 & (load_4(a + 7) >> 7);
int64_t a4 = 2097151 & (load_4(a + 10) >> 4);
int64_t a5 = 2097151 & (load_3(a + 13) >> 1);
int64_t a6 = 2097151 & (load_4(a + 15) >> 6);
int64_t a7 = 2097151 & (load_3(a + 18) >> 3);
int64_t a8 = 2097151 & load_3(a + 21);
int64_t a9 = 2097151 & (load_4(a + 23) >> 5);
int64_t a10 = 2097151 & (load_3(a + 26) >> 2);
int64_t a11 = (load_4(a + 28) >> 7);
int64_t b0 = 2097151 & load_3(b);
int64_t b1 = 2097151 & (load_4(b + 2) >> 5);
int64_t b2 = 2097151 & (load_3(b + 5) >> 2);
int64_t b3 = 2097151 & (load_4(b + 7) >> 7);
int64_t b4 = 2097151 & (load_4(b + 10) >> 4);
int64_t b5 = 2097151 & (load_3(b + 13) >> 1);
int64_t b6 = 2097151 & (load_4(b + 15) >> 6);
int64_t b7 = 2097151 & (load_3(b + 18) >> 3);
int64_t b8 = 2097151 & load_3(b + 21);
int64_t b9 = 2097151 & (load_4(b + 23) >> 5);
int64_t b10 = 2097151 & (load_3(b + 26) >> 2);
int64_t b11 = (load_4(b + 28) >> 7);
int64_t c0 = 2097151 & load_3(c);
int64_t c1 = 2097151 & (load_4(c + 2) >> 5);
int64_t c2 = 2097151 & (load_3(c + 5) >> 2);
int64_t c3 = 2097151 & (load_4(c + 7) >> 7);
int64_t c4 = 2097151 & (load_4(c + 10) >> 4);
int64_t c5 = 2097151 & (load_3(c + 13) >> 1);
int64_t c6 = 2097151 & (load_4(c + 15) >> 6);
int64_t c7 = 2097151 & (load_3(c + 18) >> 3);
int64_t c8 = 2097151 & load_3(c + 21);
int64_t c9 = 2097151 & (load_4(c + 23) >> 5);
int64_t c10 = 2097151 & (load_3(c + 26) >> 2);
int64_t c11 = (load_4(c + 28) >> 7);
int64_t s0;
int64_t s1;
int64_t s2;
int64_t s3;
int64_t s4;
int64_t s5;
int64_t s6;
int64_t s7;
int64_t s8;
int64_t s9;
int64_t s10;
int64_t s11;
int64_t s12;
int64_t s13;
int64_t s14;
int64_t s15;
int64_t s16;
int64_t s17;
int64_t s18;
int64_t s19;
int64_t s20;
int64_t s21;
int64_t s22;
int64_t s23;
int64_t carry0;
int64_t carry1;
int64_t carry2;
int64_t carry3;
int64_t carry4;
int64_t carry5;
int64_t carry6;
int64_t carry7;
int64_t carry8;
int64_t carry9;
int64_t carry10;
int64_t carry11;
int64_t carry12;
int64_t carry13;
int64_t carry14;
int64_t carry15;
int64_t carry16;
int64_t carry17;
int64_t carry18;
int64_t carry19;
int64_t carry20;
int64_t carry21;
int64_t carry22;
s0 = c0 + a0 * b0;
s1 = c1 + a0 * b1 + a1 * b0;
s2 = c2 + a0 * b2 + a1 * b1 + a2 * b0;
s3 = c3 + a0 * b3 + a1 * b2 + a2 * b1 + a3 * b0;
s4 = c4 + a0 * b4 + a1 * b3 + a2 * b2 + a3 * b1 + a4 * b0;
s5 = c5 + a0 * b5 + a1 * b4 + a2 * b3 + a3 * b2 + a4 * b1 + a5 * b0;
s6 = c6 + a0 * b6 + a1 * b5 + a2 * b4 + a3 * b3 + a4 * b2 + a5 * b1 + a6 * b0;
s7 = c7 + a0 * b7 + a1 * b6 + a2 * b5 + a3 * b4 + a4 * b3 + a5 * b2 +
a6 * b1 + a7 * b0;
s8 = c8 + a0 * b8 + a1 * b7 + a2 * b6 + a3 * b5 + a4 * b4 + a5 * b3 +
a6 * b2 + a7 * b1 + a8 * b0;
s9 = c9 + a0 * b9 + a1 * b8 + a2 * b7 + a3 * b6 + a4 * b5 + a5 * b4 +
a6 * b3 + a7 * b2 + a8 * b1 + a9 * b0;
s10 = c10 + a0 * b10 + a1 * b9 + a2 * b8 + a3 * b7 + a4 * b6 + a5 * b5 +
a6 * b4 + a7 * b3 + a8 * b2 + a9 * b1 + a10 * b0;
s11 = c11 + a0 * b11 + a1 * b10 + a2 * b9 + a3 * b8 + a4 * b7 + a5 * b6 +
a6 * b5 + a7 * b4 + a8 * b3 + a9 * b2 + a10 * b1 + a11 * b0;
s12 = a1 * b11 + a2 * b10 + a3 * b9 + a4 * b8 + a5 * b7 + a6 * b6 + a7 * b5 +
a8 * b4 + a9 * b3 + a10 * b2 + a11 * b1;
s13 = a2 * b11 + a3 * b10 + a4 * b9 + a5 * b8 + a6 * b7 + a7 * b6 + a8 * b5 +
a9 * b4 + a10 * b3 + a11 * b2;
s14 = a3 * b11 + a4 * b10 + a5 * b9 + a6 * b8 + a7 * b7 + a8 * b6 + a9 * b5 +
a10 * b4 + a11 * b3;
s15 = a4 * b11 + a5 * b10 + a6 * b9 + a7 * b8 + a8 * b7 + a9 * b6 + a10 * b5 +
a11 * b4;
s16 = a5 * b11 + a6 * b10 + a7 * b9 + a8 * b8 + a9 * b7 + a10 * b6 + a11 * b5;
s17 = a6 * b11 + a7 * b10 + a8 * b9 + a9 * b8 + a10 * b7 + a11 * b6;
s18 = a7 * b11 + a8 * b10 + a9 * b9 + a10 * b8 + a11 * b7;
s19 = a8 * b11 + a9 * b10 + a10 * b9 + a11 * b8;
s20 = a9 * b11 + a10 * b10 + a11 * b9;
s21 = a10 * b11 + a11 * b10;
s22 = a11 * b11;
s23 = 0;
carry0 = (s0 + (1 << 20)) >> 21;
s1 += carry0;
s0 -= int64_lshift21(carry0);
carry2 = (s2 + (1 << 20)) >> 21;
s3 += carry2;
s2 -= int64_lshift21(carry2);
carry4 = (s4 + (1 << 20)) >> 21;
s5 += carry4;
s4 -= int64_lshift21(carry4);
carry6 = (s6 + (1 << 20)) >> 21;
s7 += carry6;
s6 -= int64_lshift21(carry6);
carry8 = (s8 + (1 << 20)) >> 21;
s9 += carry8;
s8 -= int64_lshift21(carry8);
carry10 = (s10 + (1 << 20)) >> 21;
s11 += carry10;
s10 -= int64_lshift21(carry10);
carry12 = (s12 + (1 << 20)) >> 21;
s13 += carry12;
s12 -= int64_lshift21(carry12);
carry14 = (s14 + (1 << 20)) >> 21;
s15 += carry14;
s14 -= int64_lshift21(carry14);
carry16 = (s16 + (1 << 20)) >> 21;
s17 += carry16;
s16 -= int64_lshift21(carry16);
carry18 = (s18 + (1 << 20)) >> 21;
s19 += carry18;
s18 -= int64_lshift21(carry18);
carry20 = (s20 + (1 << 20)) >> 21;
s21 += carry20;
s20 -= int64_lshift21(carry20);
carry22 = (s22 + (1 << 20)) >> 21;
s23 += carry22;
s22 -= int64_lshift21(carry22);
carry1 = (s1 + (1 << 20)) >> 21;
s2 += carry1;
s1 -= int64_lshift21(carry1);
carry3 = (s3 + (1 << 20)) >> 21;
s4 += carry3;
s3 -= int64_lshift21(carry3);
carry5 = (s5 + (1 << 20)) >> 21;
s6 += carry5;
s5 -= int64_lshift21(carry5);
carry7 = (s7 + (1 << 20)) >> 21;
s8 += carry7;
s7 -= int64_lshift21(carry7);
carry9 = (s9 + (1 << 20)) >> 21;
s10 += carry9;
s9 -= int64_lshift21(carry9);
carry11 = (s11 + (1 << 20)) >> 21;
s12 += carry11;
s11 -= int64_lshift21(carry11);
carry13 = (s13 + (1 << 20)) >> 21;
s14 += carry13;
s13 -= int64_lshift21(carry13);
carry15 = (s15 + (1 << 20)) >> 21;
s16 += carry15;
s15 -= int64_lshift21(carry15);
carry17 = (s17 + (1 << 20)) >> 21;
s18 += carry17;
s17 -= int64_lshift21(carry17);
carry19 = (s19 + (1 << 20)) >> 21;
s20 += carry19;
s19 -= int64_lshift21(carry19);
carry21 = (s21 + (1 << 20)) >> 21;
s22 += carry21;
s21 -= int64_lshift21(carry21);
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 << 20)) >> 21;
s7 += carry6;
s6 -= int64_lshift21(carry6);
carry8 = (s8 + (1 << 20)) >> 21;
s9 += carry8;
s8 -= int64_lshift21(carry8);
carry10 = (s10 + (1 << 20)) >> 21;
s11 += carry10;
s10 -= int64_lshift21(carry10);
carry12 = (s12 + (1 << 20)) >> 21;
s13 += carry12;
s12 -= int64_lshift21(carry12);
carry14 = (s14 + (1 << 20)) >> 21;
s15 += carry14;
s14 -= int64_lshift21(carry14);
carry16 = (s16 + (1 << 20)) >> 21;
s17 += carry16;
s16 -= int64_lshift21(carry16);
carry7 = (s7 + (1 << 20)) >> 21;
s8 += carry7;
s7 -= int64_lshift21(carry7);
carry9 = (s9 + (1 << 20)) >> 21;
s10 += carry9;
s9 -= int64_lshift21(carry9);
carry11 = (s11 + (1 << 20)) >> 21;
s12 += carry11;
s11 -= int64_lshift21(carry11);
carry13 = (s13 + (1 << 20)) >> 21;
s14 += carry13;
s13 -= int64_lshift21(carry13);
carry15 = (s15 + (1 << 20)) >> 21;
s16 += carry15;
s15 -= int64_lshift21(carry15);
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 << 20)) >> 21;
s1 += carry0;
s0 -= int64_lshift21(carry0);
carry2 = (s2 + (1 << 20)) >> 21;
s3 += carry2;
s2 -= int64_lshift21(carry2);
carry4 = (s4 + (1 << 20)) >> 21;
s5 += carry4;
s4 -= int64_lshift21(carry4);
carry6 = (s6 + (1 << 20)) >> 21;
s7 += carry6;
s6 -= int64_lshift21(carry6);
carry8 = (s8 + (1 << 20)) >> 21;
s9 += carry8;
s8 -= int64_lshift21(carry8);
carry10 = (s10 + (1 << 20)) >> 21;
s11 += carry10;
s10 -= int64_lshift21(carry10);
carry1 = (s1 + (1 << 20)) >> 21;
s2 += carry1;
s1 -= int64_lshift21(carry1);
carry3 = (s3 + (1 << 20)) >> 21;
s4 += carry3;
s3 -= int64_lshift21(carry3);
carry5 = (s5 + (1 << 20)) >> 21;
s6 += carry5;
s5 -= int64_lshift21(carry5);
carry7 = (s7 + (1 << 20)) >> 21;
s8 += carry7;
s7 -= int64_lshift21(carry7);
carry9 = (s9 + (1 << 20)) >> 21;
s10 += carry9;
s9 -= int64_lshift21(carry9);
carry11 = (s11 + (1 << 20)) >> 21;
s12 += carry11;
s11 -= int64_lshift21(carry11);
s0 += s12 * 666643;
s1 += s12 * 470296;
s2 += s12 * 654183;
s3 -= s12 * 997805;
s4 += s12 * 136657;
s5 -= s12 * 683901;
s12 = 0;
carry0 = s0 >> 21;
s1 += carry0;
s0 -= int64_lshift21(carry0);
carry1 = s1 >> 21;
s2 += carry1;
s1 -= int64_lshift21(carry1);
carry2 = s2 >> 21;
s3 += carry2;
s2 -= int64_lshift21(carry2);
carry3 = s3 >> 21;
s4 += carry3;
s3 -= int64_lshift21(carry3);
carry4 = s4 >> 21;
s5 += carry4;
s4 -= int64_lshift21(carry4);
carry5 = s5 >> 21;
s6 += carry5;
s5 -= int64_lshift21(carry5);
carry6 = s6 >> 21;
s7 += carry6;
s6 -= int64_lshift21(carry6);
carry7 = s7 >> 21;
s8 += carry7;
s7 -= int64_lshift21(carry7);
carry8 = s8 >> 21;
s9 += carry8;
s8 -= int64_lshift21(carry8);
carry9 = s9 >> 21;
s10 += carry9;
s9 -= int64_lshift21(carry9);
carry10 = s10 >> 21;
s11 += carry10;
s10 -= int64_lshift21(carry10);
carry11 = s11 >> 21;
s12 += carry11;
s11 -= int64_lshift21(carry11);
s0 += s12 * 666643;
s1 += s12 * 470296;
s2 += s12 * 654183;
s3 -= s12 * 997805;
s4 += s12 * 136657;
s5 -= s12 * 683901;
s12 = 0;
carry0 = s0 >> 21;
s1 += carry0;
s0 -= int64_lshift21(carry0);
carry1 = s1 >> 21;
s2 += carry1;
s1 -= int64_lshift21(carry1);
carry2 = s2 >> 21;
s3 += carry2;
s2 -= int64_lshift21(carry2);
carry3 = s3 >> 21;
s4 += carry3;
s3 -= int64_lshift21(carry3);
carry4 = s4 >> 21;
s5 += carry4;
s4 -= int64_lshift21(carry4);
carry5 = s5 >> 21;
s6 += carry5;
s5 -= int64_lshift21(carry5);
carry6 = s6 >> 21;
s7 += carry6;
s6 -= int64_lshift21(carry6);
carry7 = s7 >> 21;
s8 += carry7;
s7 -= int64_lshift21(carry7);
carry8 = s8 >> 21;
s9 += carry8;
s8 -= int64_lshift21(carry8);
carry9 = s9 >> 21;
s10 += carry9;
s9 -= int64_lshift21(carry9);
carry10 = s10 >> 21;
s11 += carry10;
s10 -= int64_lshift21(carry10);
s[0] = s0 >> 0;
s[1] = s0 >> 8;
s[2] = (s0 >> 16) | (s1 << 5);
s[3] = s1 >> 3;
s[4] = s1 >> 11;
s[5] = (s1 >> 19) | (s2 << 2);
s[6] = s2 >> 6;
s[7] = (s2 >> 14) | (s3 << 7);
s[8] = s3 >> 1;
s[9] = s3 >> 9;
s[10] = (s3 >> 17) | (s4 << 4);
s[11] = s4 >> 4;
s[12] = s4 >> 12;
s[13] = (s4 >> 20) | (s5 << 1);
s[14] = s5 >> 7;
s[15] = (s5 >> 15) | (s6 << 6);
s[16] = s6 >> 2;
s[17] = s6 >> 10;
s[18] = (s6 >> 18) | (s7 << 3);
s[19] = s7 >> 5;
s[20] = s7 >> 13;
s[21] = s8 >> 0;
s[22] = s8 >> 8;
s[23] = (s8 >> 16) | (s9 << 5);
s[24] = s9 >> 3;
s[25] = s9 >> 11;
s[26] = (s9 >> 19) | (s10 << 2);
s[27] = s10 >> 6;
s[28] = (s10 >> 14) | (s11 << 7);
s[29] = s11 >> 1;
s[30] = s11 >> 9;
s[31] = s11 >> 17;
}