Add methods enabling certificate verification

src/SSLSocket.h

@@ -24,6 +24,8 @@
 
 #import <ObjFW/OFTCPSocket.h>
 
+@class X509Certificate;
+
 @interface SSLSocket: OFTCPSocket
 {
 	SSL *ssl;
@@ -44,4 +46,6 @@
 - (void)setCertificateFile: (OFString*)file;
 - (OFString*)certificateFile;
 - (OFDataArray*)channelBindingDataWithType: (OFString*)type;
+- (X509Certificate*)peerCertificate;
+- (void)verifyPeerCertificate;
 @end