Testing gen pub -e -p -q.

Fixing public key generation, which segfaulted with the couple <p, q>, and
adding a small test to asssert it.
Moreover, changing #!/bin/bash to #!/bin/sh. Apparently using bash is almost
always wrong: may be outdated in new osx, not present in some linux, and
generally not really needed in comparaison with bash.

src/apps/gen.c

@@ -39,12 +39,16 @@ pubkey_generation(RSA* rsa)
     exit(EXIT_FAILURE);
     }
 
-  if (!rsa->n)
+  if (!rsa->n) {
+    rsa->n = BN_new();
     BN_mul(rsa->n, rsa->p, rsa->q, ctx);
+  }
 
   PEM_write_RSAPublicKey(stdout, rsa);
 
   BN_CTX_free(ctx);
+  RSA_free(rsa);
+
   return EXIT_SUCCESS;
 }
 

src/apps/tests/test_gen_pub.test

@@ -1,6 +1,24 @@
-#!/bin/bash
+#!/bin/sh
 
 # N = 11 * 13
 # e = 103
 # d = 7
 ./gen pub -N 143 -e 103 | grep -q PUBLIC
+if [ $? -ne 0 ]
+then
+    echo "should accept public exponent and public modulus."
+    exit 1
+fi
+
+
+# <http://cryptowars2011.forumfree.it/?t=58954862>
+p='5596931086554284281185296406554840964858720713572245165038844132225787390922\
+226340619345603534845283511495476913891096668345376424228245705523358529690689'
+q='5596931086554284281185296406554840964858720713572245165038844132225787390922\
+226340619345603534845283511495476913891096668345376424228245705523358529692809'
+./gen pub -p $p -q $q -e 29
+if [ $? -ne 0 ]
+then
+    echo "should accept the pair of primes <p, q> and the public exponent."
+    exit 1
+fi