diff --git a/src/crypto/ms_funcs.c b/src/crypto/ms_funcs.c
index d0d6a96af..aff7d33f4 100644
--- a/src/crypto/ms_funcs.c
+++ b/src/crypto/ms_funcs.c
@@ -140,17 +140,20 @@ int hash_nt_password_hash(const u8 *password_hash, u8 *password_hash_hash)
  * @challenge: 8-octet Challenge (IN)
  * @password_hash: 16-octet PasswordHash (IN)
  * @response: 24-octet Response (OUT)
+ * Returns: 0 on success, -1 on failure
  */
-void challenge_response(const u8 *challenge, const u8 *password_hash,
-			u8 *response)
+int challenge_response(const u8 *challenge, const u8 *password_hash,
+		       u8 *response)
 {
 	u8 zpwd[7];
-	des_encrypt(challenge, password_hash, response);
-	des_encrypt(challenge, password_hash + 7, response + 8);
+
+	if (des_encrypt(challenge, password_hash, response) < 0 ||
+	    des_encrypt(challenge, password_hash + 7, response + 8) < 0)
+		return -1;
 	zpwd[0] = password_hash[14];
 	zpwd[1] = password_hash[15];
 	os_memset(zpwd + 2, 0, 5);
-	des_encrypt(challenge, zpwd, response + 16);
+	return des_encrypt(challenge, zpwd, response + 16);
 }
 
 
@@ -175,9 +178,9 @@ int generate_nt_response(const u8 *auth_challenge, const u8 *peer_challenge,
 
 	if (challenge_hash(peer_challenge, auth_challenge, username,
 			   username_len, challenge) ||
-	    nt_password_hash(password, password_len, password_hash))
+	    nt_password_hash(password, password_len, password_hash) ||
+	    challenge_response(challenge, password_hash, response))
 		return -1;
-	challenge_response(challenge, password_hash, response);
 	return 0;
 }
 
@@ -202,9 +205,9 @@ int generate_nt_response_pwhash(const u8 *auth_challenge,
 
 	if (challenge_hash(peer_challenge, auth_challenge,
 			   username, username_len,
-			   challenge))
+			   challenge) ||
+	    challenge_response(challenge, password_hash, response))
 		return -1;
-	challenge_response(challenge, password_hash, response);
 	return 0;
 }
 
@@ -304,9 +307,10 @@ int nt_challenge_response(const u8 *challenge, const u8 *password,
 			  size_t password_len, u8 *response)
 {
 	u8 password_hash[16];
-	if (nt_password_hash(password, password_len, password_hash))
+
+	if (nt_password_hash(password, password_len, password_hash) ||
+	    challenge_response(challenge, password_hash, response))
 		return -1;
-	challenge_response(challenge, password_hash, response);
 	return 0;
 }
 
@@ -487,12 +491,15 @@ int new_password_encrypted_with_old_nt_password_hash(
  * @password_hash: 16-octer PasswordHash (IN)
  * @block: 16-octet Block (IN)
  * @cypher: 16-octer Cypher (OUT)
+ * Returns: 0 on success, -1 on failure
  */
-void nt_password_hash_encrypted_with_block(const u8 *password_hash,
-					   const u8 *block, u8 *cypher)
+int nt_password_hash_encrypted_with_block(const u8 *password_hash,
+					  const u8 *block, u8 *cypher)
 {
-	des_encrypt(password_hash, block, cypher);
-	des_encrypt(password_hash + 8, block + 7, cypher + 8);
+	if (des_encrypt(password_hash, block, cypher) < 0 ||
+	    des_encrypt(password_hash + 8, block + 7, cypher + 8) < 0)
+		return -1;
+	return 0;
 }
 
 
@@ -515,10 +522,10 @@ int old_nt_password_hash_encrypted_with_new_nt_password_hash(
 	if (nt_password_hash(old_password, old_password_len,
 			     old_password_hash) ||
 	    nt_password_hash(new_password, new_password_len,
-			     new_password_hash))
+			     new_password_hash) ||
+	    nt_password_hash_encrypted_with_block(old_password_hash,
+						  new_password_hash,
+						  encrypted_password_hash))
 		return -1;
-	nt_password_hash_encrypted_with_block(old_password_hash,
-					      new_password_hash,
-					      encrypted_password_hash);
 	return 0;
 }
diff --git a/src/crypto/ms_funcs.h b/src/crypto/ms_funcs.h
index b5b5918e1..b8d55f053 100644
--- a/src/crypto/ms_funcs.h
+++ b/src/crypto/ms_funcs.h
@@ -31,8 +31,8 @@ int generate_authenticator_response_pwhash(
 int nt_challenge_response(const u8 *challenge, const u8 *password,
 			  size_t password_len, u8 *response);
 
-void challenge_response(const u8 *challenge, const u8 *password_hash,
-			u8 *response);
+int challenge_response(const u8 *challenge, const u8 *password_hash,
+		       u8 *response);
 int challenge_hash(const u8 *peer_challenge, const u8 *auth_challenge,
 		   const u8 *username, size_t username_len, u8 *challenge);
 int nt_password_hash(const u8 *password, size_t password_len,
@@ -50,8 +50,8 @@ int __must_check new_password_encrypted_with_old_nt_password_hash(
 	const u8 *new_password, size_t new_password_len,
 	const u8 *old_password, size_t old_password_len,
 	u8 *encrypted_pw_block);
-void nt_password_hash_encrypted_with_block(const u8 *password_hash,
-					   const u8 *block, u8 *cypher);
+int nt_password_hash_encrypted_with_block(const u8 *password_hash,
+					  const u8 *block, u8 *cypher);
 int old_nt_password_hash_encrypted_with_new_nt_password_hash(
 	const u8 *new_password, size_t new_password_len,
 	const u8 *old_password, size_t old_password_len,
diff --git a/src/eap_peer/eap_leap.c b/src/eap_peer/eap_leap.c
index ff6fa4afd..7bb62e72d 100644
--- a/src/eap_peer/eap_leap.c
+++ b/src/eap_peer/eap_leap.c
@@ -115,10 +115,13 @@ static struct wpabuf * eap_leap_process_request(struct eap_sm *sm, void *priv,
 	wpabuf_put_u8(resp, 0); /* unused */
 	wpabuf_put_u8(resp, LEAP_RESPONSE_LEN);
 	rpos = wpabuf_put(resp, LEAP_RESPONSE_LEN);
-	if (pwhash)
-		challenge_response(challenge, password, rpos);
-	else
-		nt_challenge_response(challenge, password, password_len, rpos);
+	if ((pwhash && challenge_response(challenge, password, rpos)) ||
+	    (!pwhash &&
+	     nt_challenge_response(challenge, password, password_len, rpos))) {
+		wpa_printf(MSG_DEBUG, "EAP-LEAP: Failed to derive response");
+		ret->ignore = TRUE;
+		return NULL;
+	}
 	os_memcpy(data->peer_response, rpos, LEAP_RESPONSE_LEN);
 	wpa_hexdump(MSG_MSGDUMP, "EAP-LEAP: Response",
 		    rpos, LEAP_RESPONSE_LEN);
@@ -239,7 +242,10 @@ static struct wpabuf * eap_leap_process_response(struct eap_sm *sm, void *priv,
 			return NULL;
 		}
 	}
-	challenge_response(data->ap_challenge, pw_hash_hash, expected);
+	if (challenge_response(data->ap_challenge, pw_hash_hash, expected)) {
+		ret->ignore = TRUE;
+		return NULL;
+	}
 
 	ret->methodState = METHOD_DONE;
 	ret->allowNotifications = FALSE;
diff --git a/src/eap_peer/eap_mschapv2.c b/src/eap_peer/eap_mschapv2.c
index ce2227d38..d346dccab 100644
--- a/src/eap_peer/eap_mschapv2.c
+++ b/src/eap_peer/eap_mschapv2.c
@@ -567,11 +567,11 @@ static struct wpabuf * eap_mschapv2_change_password(
 	if (pwhash) {
 		u8 new_password_hash[16];
 		if (nt_password_hash(new_password, new_password_len,
-				     new_password_hash))
+				     new_password_hash) ||
+		    nt_password_hash_encrypted_with_block(password,
+							  new_password_hash,
+							  cp->encr_hash))
 			goto fail;
-		nt_password_hash_encrypted_with_block(password,
-						      new_password_hash,
-						      cp->encr_hash);
 	} else {
 		if (old_nt_password_hash_encrypted_with_new_nt_password_hash(
 			    new_password, new_password_len,
diff --git a/src/eap_peer/eap_ttls.c b/src/eap_peer/eap_ttls.c
index 3354b2d3a..6714b903e 100644
--- a/src/eap_peer/eap_ttls.c
+++ b/src/eap_peer/eap_ttls.c
@@ -624,12 +624,16 @@ static int eap_ttls_phase2_request_mschap(struct eap_sm *sm,
 	os_memset(pos, 0, 24); /* LM-Response */
 	pos += 24;
 	if (pwhash) {
-		challenge_response(challenge, password, pos); /* NT-Response */
+		/* NT-Response */
+		if (challenge_response(challenge, password, pos))
+			return -1;
 		wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password hash",
 				password, 16);
 	} else {
-		nt_challenge_response(challenge, password, password_len,
-				      pos); /* NT-Response */
+		/* NT-Response */
+		if (nt_challenge_response(challenge, password, password_len,
+					  pos))
+			return -1;
 		wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password",
 				      password, password_len);
 	}
diff --git a/src/eap_server/eap_server_ttls.c b/src/eap_server/eap_server_ttls.c
index a53633f8f..160462952 100644
--- a/src/eap_server/eap_server_ttls.c
+++ b/src/eap_server/eap_server_ttls.c
@@ -372,7 +372,7 @@ static void eap_ttls_reset(struct eap_sm *sm, void *priv)
 
 static struct wpabuf * eap_ttls_build_start(struct eap_sm *sm,
 					    struct eap_ttls_data *data, u8 id)
-{	
+{
 	struct wpabuf *req;
 
 	req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TTLS, 1,
@@ -666,11 +666,14 @@ static void eap_ttls_process_phase2_mschap(struct eap_sm *sm,
 	}
 	os_free(chal);
 
-	if (sm->user->password_hash)
-		challenge_response(challenge, sm->user->password, nt_response);
-	else
-		nt_challenge_response(challenge, sm->user->password,
-				      sm->user->password_len, nt_response);
+	if ((sm->user->password_hash &&
+	     challenge_response(challenge, sm->user->password, nt_response)) ||
+	    (!sm->user->password_hash &&
+	     nt_challenge_response(challenge, sm->user->password,
+				   sm->user->password_len, nt_response))) {
+		eap_ttls_state(data, FAILURE);
+		return;
+	}
 
 	if (os_memcmp_const(nt_response, response + 2 + 24, 24) == 0) {
 		wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Correct response");