commit files needed for zpm-fetchurl

[zpackage] / crypto / ref10 / fe_mul121666.c

diff --git a/crypto/ref10/fe_mul121666.c b/crypto/ref10/fe_mul121666.c
new file mode 100644 (file)
index 0000000..ae96853
--- /dev/null
+++ b/crypto/ref10/fe_mul121666.c
@@ -0,0 +1,68 @@
+#include <stdint.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(int32_t h[10], int32_t f[10]) {
+       int32_t f0 = f[0];
+       int32_t f1 = f[1];
+       int32_t f2 = f[2];
+       int32_t f3 = f[3];
+       int32_t f4 = f[4];
+       int32_t f5 = f[5];
+       int32_t f6 = f[6];
+       int32_t f7 = f[7];
+       int32_t f8 = f[8];
+       int32_t f9 = f[9];
+       int64_t h0 = f0 * (int64_t) 121666;
+       int64_t h1 = f1 * (int64_t) 121666;
+       int64_t h2 = f2 * (int64_t) 121666;
+       int64_t h3 = f3 * (int64_t) 121666;
+       int64_t h4 = f4 * (int64_t) 121666;
+       int64_t h5 = f5 * (int64_t) 121666;
+       int64_t h6 = f6 * (int64_t) 121666;
+       int64_t h7 = f7 * (int64_t) 121666;
+       int64_t h8 = f8 * (int64_t) 121666;
+       int64_t h9 = f9 * (int64_t) 121666;
+       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;
+
+       carry9 = (h9 + (int64_t) (1<<24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;
+       carry1 = (h1 + (int64_t) (1<<24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
+       carry3 = (h3 + (int64_t) (1<<24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
+       carry5 = (h5 + (int64_t) (1<<24)) >> 25; h6 += carry5; h5 -= carry5 << 25;
+       carry7 = (h7 + (int64_t) (1<<24)) >> 25; h8 += carry7; h7 -= carry7 << 25;
+
+       carry0 = (h0 + (int64_t) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
+       carry2 = (h2 + (int64_t) (1<<25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
+       carry4 = (h4 + (int64_t) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
+       carry6 = (h6 + (int64_t) (1<<25)) >> 26; h7 += carry6; h6 -= carry6 << 26;
+       carry8 = (h8 + (int64_t) (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;
+}