Add simple public-key encryption program `catcrypt'.

[u/mdw/catacomb] / ec-info.c

diff --git a/ec-info.c b/ec-info.c
index 1a95cd2..4f852c2 100644 (file)
--- a/ec-info.c
+++ b/ec-info.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: ec-info.c,v 1.5 2004/04/08 01:36:15 mdw Exp $
+ * $Id: ec-info.c,v 1.7 2004/04/17 09:58:37 mdw Exp $
  *
  * Elliptic curve information management
  *
@@ -372,11 +372,6 @@ static const char *primecheck(const ec_info *ei, grand *gr)
 
   if (!pgen_primep(ei->r, gr)) return ("generator order not prime");
 
-  /* --- Check %$0 < h \le 4$% --- */
-
-  if (MP_CMP(ei->h, <, MP_ONE) || MP_CMP(ei->h, >, MP_FOUR))
-    return ("cofactor out of range");
-
   /* --- Check %$h = \lfloor (\sqrt{p} + 1)^2/r \rlfoor$% --- *
    *
    * This seems to work with the approximate-sqrt in the library, but might
@@ -421,6 +416,11 @@ static const char *primecheck(const ec_info *ei, grand *gr)
   MP_DROP(x);
   if (i) return ("curve is weak");
 
+  /* --- Check %$0 < h \le 4$% --- */
+
+  if (MP_CMP(ei->h, <, MP_ONE) || MP_CMP(ei->h, >, MP_FOUR))
+    return ("cofactor out of range");
+
   /* --- Done --- */
 
   return (0);
@@ -459,11 +459,6 @@ static const char *bincheck(const ec_info *ei, grand *gr)
 
   if (!pgen_primep(ei->r, gr)) return ("generator order not prime");
 
-  /* --- Check %$0 < h \le 4$% --- */
-
-  if (MP_CMP(ei->h, <, MP_ONE) || MP_CMP(ei->h, >, MP_FOUR))
-    return ("cofactor out of range");
-
   /* --- Check %$h = \lfloor (\sqrt{2^m} + 1)^2/r \rlfoor$% --- *
    *
    * This seems to work with the approximate-sqrt in the library, but might
@@ -505,6 +500,11 @@ static const char *bincheck(const ec_info *ei, grand *gr)
   MP_DROP(x);
   if (i) return ("curve is weak");
 
+  /* --- Check %$0 < h \le 4$% --- */
+
+  if (MP_CMP(ei->h, <, MP_ONE) || MP_CMP(ei->h, >, MP_FOUR))
+    return ("cofactor out of range");
+
   /* --- Done --- */
 
   return (0);
@@ -525,29 +525,48 @@ const char *ec_checkinfo(const ec_info *ei, grand *gr)
 
 #include "fibrand.h"
 
-int main(void)
+int main(int argc, char *argv[])
 {
   const ecentry *ee;
   const char *e;
   int ok = 1;
+  int i;
   grand *gr;
 
   gr = fibrand_create(0);
-  fputs("checking standard curves: ", stdout);
-  for (ee = ectab; ee->name; ee++) {
-    ec_info ei;
-    getinfo(&ei, ee->data);
-    e = ec_checkinfo(&ei, gr);
-    ec_freeinfo(&ei);
-    if (e) {
-      fprintf(stderr, "\n*** curve %s fails: %s\n", ee->name, e);
-      ok = 0;
+  if (argc > 1) {
+    for (i = 1; i < argc; i++) {
+      ec_info ei;
+      if ((e = ec_getinfo(&ei, argv[i])) != 0)
+       fprintf(stderr, "bad curve spec `%s': %s", argv[i], e);
+      else {
+       e = ec_checkinfo(&ei, gr);
+       ec_freeinfo(&ei);
+       if (!e)
+         printf("OK %s\n", argv[i]);
+       else {
+         printf("BAD %s: %s\n", argv[i], e);
+         ok = 0;
+       }
+      }
+    }
+  } else {
+    fputs("checking standard curves: ", stdout);
+    for (ee = ectab; ee->name; ee++) {
+      ec_info ei;
+      getinfo(&ei, ee->data);
+      e = ec_checkinfo(&ei, gr);
+      ec_freeinfo(&ei);
+      if (e) {
+       fprintf(stderr, "\n*** curve %s fails: %s\n", ee->name, e);
+       ok = 0;
+      }
+      putchar('.');
+      fflush(stdout);
     }
-    putchar('.');
-    fflush(stdout);
+    fputs(ok ? " ok\n" : " failed\n", stdout);
   }
   gr->ops->destroy(gr);
-  fputs(ok ? " ok\n" : " failed\n", stdout);
   return (!ok);
 }