diff --git a/library/pk.c b/library/pk.c
index 3711794..6f68c73 100644
--- a/library/pk.c
+++ b/library/pk.c
@@ -130,12 +130,29 @@
     if( ctx->pk_info->verify_func == NULL )
         return( POLARSSL_ERR_PK_TYPE_MISMATCH );
 
-    return( ctx->pk_info->verify_func( ctx->pk_ctx, md_alg,
-                                       hash, hash_len,
+    return( ctx->pk_info->verify_func( ctx->pk_ctx, md_alg, hash, hash_len,
                                        sig, sig_len ) );
 }
 
 /*
+ * Make a signature
+ */
+int pk_sign( pk_context *ctx, md_type_t md_alg,
+             const unsigned char *hash, size_t hash_len,
+             unsigned char *sig, size_t *sig_len,
+             int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
+{
+    if( ctx == NULL || ctx->pk_info == NULL )
+        return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
+
+    if( ctx->pk_info->sign_func == NULL )
+        return( POLARSSL_ERR_PK_TYPE_MISMATCH );
+
+    return( ctx->pk_info->sign_func( ctx->pk_ctx, md_alg, hash, hash_len,
+                                     sig, sig_len, f_rng, p_rng ) );
+}
+
+/*
  * Get key size in bits
  */
 size_t pk_get_size( const pk_context *ctx )