commit c75c56fef73745975a8a82271d6f2e8bde526ca4
author Manuel Pégourié-Gonnard <mpg@elzevir.fr> Mon Sep 02 16:25:37 2013 +0200
committer Manuel Pégourié-Gonnard <mpg@elzevir.fr> Mon Sep 02 16:25:37 2013 +0200
tree 32b2529deb145f92f4837055ec4c7c7c975ef9c2
parent e09d2f8261723acfecaf22d6fcde723913ee8ff0

Fix off-by-one error in ecdsa_write_signature()

Made some signature fail with 521-bit curve

library/ecdsa.c

diff --git a/library/ecdsa.c b/library/ecdsa.c
index bbdb5d5..dc169ce 100644
--- a/library/ecdsa.c
+++ b/library/ecdsa.c
@@ -220,8 +220,8 @@
                            void *p_rng )
 {
     int ret;
-    unsigned char buf[MAX_SIG_LEN];
-    unsigned char *p = buf + MAX_SIG_LEN - 1;
+    unsigned char buf[MAX_SIG_LEN + 3];
+    unsigned char *p = buf + MAX_SIG_LEN;
     size_t len = 0;
 
     if( ( ret = ecdsa_sign( &ctx->grp, &ctx->r, &ctx->s, &ctx->d,