set6: challenge 46: completed

1 files changed, 13 insertions, 5 deletions

diff --git a/lib/lib6.c b/lib/lib6.c
index 432c959..5999e91 100644
--- a/lib/lib6.c
+++ b/lib/lib6.c
@@ -228,12 +228,20 @@ void dsa_recover_k_from_repeated_nonce(BIGNUM *mess1_hash, BIGNUM *mess2_hash,
 void dsa_generate_magic_signature(struct dsa_public_params *pub, struct dsa_per_user_param
 		*priv, BIGNUM *mess_hash)
 {
-		BIGNUM *tmp = BN_new();
+	BIGNUM *tmp = BN_new();
 
-		BN_mod_exp(tmp, priv->public, mess_hash, pub->p, ctx);
-		BN_mod(priv->r, tmp, pub->q, ctx);
+	BN_mod_exp(tmp, priv->public, mess_hash, pub->p, ctx);
+	BN_mod(priv->r, tmp, pub->q, ctx);
 
-		BN_mod_inverse(tmp, mess_hash, pub->q, ctx);
-		BN_mod_mul(priv->s, priv->r, tmp, pub->q, ctx);
+	BN_mod_inverse(tmp, mess_hash, pub->q, ctx);
+	BN_mod_mul(priv->s, priv->r, tmp, pub->q, ctx);
+	
+}
 
+int rsa_parity_orcale(BIGNUM *message, struct rsa_key_bignum *private)
+{
+	BIGNUM *decrypted = BN_new();
+	// decrypt and check last bit
+	rsa_decrypt_bignum(message, decrypted, private);
+	return BN_is_odd(decrypted);
 }