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authorRuan HE <ruan.he@orange.com>2015-09-04 07:35:06 +0000
committerGerrit Code Review <gerrit@172.30.200.206>2015-09-04 07:35:06 +0000
commitca6aa8198d2335f8c326c3dd4d26bf5899064214 (patch)
tree6274a2d971fc0cac0896efe8583927d0190e3d20 /moon-abe/pbc-0.5.14/arith/fp.c
parent92fd2dbfb672d7b2b1cdfd5dd5cf89f7716b3e12 (diff)
parent3baeb11a8fbcfcdbc31976d421f17b85503b3ecd (diff)
Merge "init attribute-based encryption"
Diffstat (limited to 'moon-abe/pbc-0.5.14/arith/fp.c')
-rw-r--r--moon-abe/pbc-0.5.14/arith/fp.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/moon-abe/pbc-0.5.14/arith/fp.c b/moon-abe/pbc-0.5.14/arith/fp.c
new file mode 100644
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+++ b/moon-abe/pbc-0.5.14/arith/fp.c
@@ -0,0 +1,49 @@
+// F_p initialization.
+//
+// Specific implementations of F_p are found in naivefp.c, fastfp.c, fasterfp.c
+// and montfp.c. For pairing-based cryptosystems, montfp.c is the fastest.
+// I keep all versions around for testing, and also to show off the modularity
+// of the code.
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdint.h> // for intptr_t
+#include <gmp.h>
+#include <string.h>
+#include "pbc_utils.h"
+#include "pbc_field.h"
+#include "pbc_fp.h"
+
+// By default, use the montfp.c implementation of F_p. After
+// pbc_tweak_use_fp(), future field_init_fp calls will use the specified
+// implementation. This is useful for benchmarking and testing.
+static void (*option_fpinit) (field_ptr f, mpz_t prime) = field_init_mont_fp;
+
+void pbc_tweak_use_fp(char *s) {
+ if (!strcmp(s, "naive")) {
+ option_fpinit = field_init_naive_fp;
+ } else if (!strcmp(s, "fast")) {
+ option_fpinit = field_init_fast_fp;
+ } else if (!strcmp(s, "faster")) {
+ option_fpinit = field_init_faster_fp;
+ } else if (!strcmp(s, "mont")) {
+ option_fpinit = field_init_mont_fp;
+ } else {
+ pbc_error("no such Fp implementation: %s", s);
+ }
+}
+
+void field_init_fp(field_ptr f, mpz_t modulus) {
+ if (mpz_fits_ulong_p(modulus)) {
+ // If this case mattered, I'd have written a F_p implementation specialized
+ // for moduli that fits into machine words.
+ field_init_naive_fp(f, modulus);
+ } else {
+ if (mpz_odd_p(modulus)) {
+ option_fpinit(f, modulus);
+ } else {
+ // montfp.c only supports odd moduli.
+ field_init_faster_fp(f, modulus);
+ }
+ }
+}