-rw-r--r-- 2236 lib25519-20221222/crypto_nP/montgomery25519/ref10/fe_mul121666.c raw
// linker define fe_mul121666 #include "fe.h" #include "crypto_int64.h" /* h = f * 121666 Can overlap h with f. Preconditions: |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc. Postconditions: |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc. */ void fe_mul121666(fe h,const fe f) { crypto_int32 f0 = f[0]; crypto_int32 f1 = f[1]; crypto_int32 f2 = f[2]; crypto_int32 f3 = f[3]; crypto_int32 f4 = f[4]; crypto_int32 f5 = f[5]; crypto_int32 f6 = f[6]; crypto_int32 f7 = f[7]; crypto_int32 f8 = f[8]; crypto_int32 f9 = f[9]; crypto_int64 h0 = f0 * (crypto_int64) 121666; crypto_int64 h1 = f1 * (crypto_int64) 121666; crypto_int64 h2 = f2 * (crypto_int64) 121666; crypto_int64 h3 = f3 * (crypto_int64) 121666; crypto_int64 h4 = f4 * (crypto_int64) 121666; crypto_int64 h5 = f5 * (crypto_int64) 121666; crypto_int64 h6 = f6 * (crypto_int64) 121666; crypto_int64 h7 = f7 * (crypto_int64) 121666; crypto_int64 h8 = f8 * (crypto_int64) 121666; crypto_int64 h9 = f9 * (crypto_int64) 121666; crypto_int64 carry0; crypto_int64 carry1; crypto_int64 carry2; crypto_int64 carry3; crypto_int64 carry4; crypto_int64 carry5; crypto_int64 carry6; crypto_int64 carry7; crypto_int64 carry8; crypto_int64 carry9; carry9 = (h9 + (crypto_int64) (1<<24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25; carry1 = (h1 + (crypto_int64) (1<<24)) >> 25; h2 += carry1; h1 -= carry1 << 25; carry3 = (h3 + (crypto_int64) (1<<24)) >> 25; h4 += carry3; h3 -= carry3 << 25; carry5 = (h5 + (crypto_int64) (1<<24)) >> 25; h6 += carry5; h5 -= carry5 << 25; carry7 = (h7 + (crypto_int64) (1<<24)) >> 25; h8 += carry7; h7 -= carry7 << 25; carry0 = (h0 + (crypto_int64) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26; carry2 = (h2 + (crypto_int64) (1<<25)) >> 26; h3 += carry2; h2 -= carry2 << 26; carry4 = (h4 + (crypto_int64) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26; carry6 = (h6 + (crypto_int64) (1<<25)) >> 26; h7 += carry6; h6 -= carry6 << 26; carry8 = (h8 + (crypto_int64) (1<<25)) >> 26; h9 += carry8; h8 -= carry8 << 26; h[0] = h0; h[1] = h1; h[2] = h2; h[3] = h3; h[4] = h4; h[5] = h5; h[6] = h6; h[7] = h7; h[8] = h8; h[9] = h9; }