Refactor siglen_map[] to store key size in bytes instead of 32-bit words.

Review URL: http://codereview.chromium.org/660261
diff --git a/crypto/rsa.c b/crypto/rsa.c
index 372b73d..d23be89 100644
--- a/crypto/rsa.c
+++ b/crypto/rsa.c
@@ -147,7 +147,7 @@
     return 0;
   }
 
-  if (key->len != siglen_map[sig_type]) {
+  if (key->len != siglen_map[sig_type] / sizeof(uint32_t)) {
     fprintf(stderr, "Wrong key passed in!\n");
     return 0;
   }