From 3baeb11a8fbcfcdbc31976d421f17b85503b3ecd Mon Sep 17 00:00:00 2001
From: WuKong <rebirthmonkey@gmail.com>
Date: Fri, 4 Sep 2015 09:25:34 +0200
Subject: init attribute-based encryption

Change-Id: Iba1a3d722110abf747a0fba366f3ebc911d25b25
---
 moon-abe/pbc-0.5.14/gen/hilbertpoly.c | 57 +++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 moon-abe/pbc-0.5.14/gen/hilbertpoly.c

(limited to 'moon-abe/pbc-0.5.14/gen/hilbertpoly.c')

diff --git a/moon-abe/pbc-0.5.14/gen/hilbertpoly.c b/moon-abe/pbc-0.5.14/gen/hilbertpoly.c
new file mode 100644
index 00000000..2e73af4e
--- /dev/null
+++ b/moon-abe/pbc-0.5.14/gen/hilbertpoly.c
@@ -0,0 +1,57 @@
+// Prints Hilbert polynomials H_D(X)
+//
+// Usage: hilbertpoly [LOWER [UPPER]]
+//
+// LOWER:
+//   Lower limit of D. Defaults to 3.
+// UPPER:
+//   Upper limit of D. Defaults to LOWER.
+//
+// e.g. $ hilbertpoly 3 1000000
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdint.h> // for intptr_t
+#include <stdlib.h> //for atoi, exit
+#include <gmp.h>
+#include "pbc_utils.h"
+#include "pbc_hilbert.h"
+
+static void xpow(int degree) {
+  if (degree == 1) {
+    printf("X");
+  } else if (degree) {
+    printf("X^%d", degree);
+  }
+}
+
+int main(int argc, char **argv) {
+  int D      = argc > 1 ? atoi(argv[1]) : 3;
+  if (D <= 0) pbc_die("D must be positive.");
+
+  int Dlimit = argc > 2 ? atoi(argv[2]) : D;
+
+  for(; D <= Dlimit; D++) {
+    mpz_t *coefflist;
+    int m = D % 4;
+    if (m == 1 || m == 2) continue;
+    printf("D = %d\n", D);
+
+    int n = pbc_hilbert(&coefflist, D);
+
+    printf(" ");
+    xpow(n - 1);
+    printf("\n");
+    int i;
+    for (i = n - 2; i >= 0; i--) {
+      if (mpz_sgn(coefflist[i]) >= 0) {
+        printf("+");
+      }
+      mpz_out_str(stdout, 0, coefflist[i]);
+      xpow(i);
+      printf("\n");
+    }
+    pbc_hilbert_free(coefflist, n);
+  }
+
+  return 0;
+}
-- 
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