Fix EAP-FAST with OpenSSL 1.0.1

The mechanism to figure out key block size based on ssl->read_hash
does not seem to work with OpenSSL 1.0.1, so add an alternative
mechanism to figure out the NAC key size that seems to work at
least with the current OpenSSL 1.0.1 releases.

Signed-hostap: Jouni Malinen <j@w1.fi>
intended-for: hostap-1

src/crypto/tls_openssl.c

@@ -2832,6 +2832,7 @@ int tls_connection_get_keyblock_size(void *tls_ctx,
 {
 	const EVP_CIPHER *c;
 	const EVP_MD *h;
+	int md_size;
 
 	if (conn == NULL || conn->ssl == NULL ||
 	    conn->ssl->enc_read_ctx == NULL ||
@@ -2845,9 +2846,20 @@ int tls_connection_get_keyblock_size(void *tls_ctx,
 #else
 	h = conn->ssl->read_hash;
 #endif
+	if (h)
+		md_size = EVP_MD_size(h);
+#if OPENSSL_VERSION_NUMBER >= 0x10000000L
+	else if (conn->ssl->s3)
+		md_size = conn->ssl->s3->tmp.new_mac_secret_size;
+#endif
+	else
+		return -1;
 
+	wpa_printf(MSG_DEBUG, "OpenSSL: keyblock size: key_len=%d MD_size=%d "
+		   "IV_len=%d", EVP_CIPHER_key_length(c), md_size,
+		   EVP_CIPHER_iv_length(c));
 	return 2 * (EVP_CIPHER_key_length(c) +
-		    EVP_MD_size(h) +
+		    md_size +
 		    EVP_CIPHER_iv_length(c));
 }