1 files changed, 159 insertions, 6 deletions

diff --git a/xcode/OLMKit/OLMSession.m b/xcode/OLMKit/OLMSession.m
index 24a8b36..fa7cb62 100644
--- a/xcode/OLMKit/OLMSession.m
+++ b/xcode/OLMKit/OLMSession.m
@@ -7,6 +7,8 @@
 //
 
 #import "OLMSession.h"
+#import "OLMUtility.h"
+#import "OLMAccount_Private.h"
 @import olm;
 
 @interface OLMSession()
@@ -15,16 +17,167 @@
 
 @implementation OLMSession
 
-- (instancetype) initOutboundSessionWithAccount:(OLMAccount*)account theirIdentityKey:(NSData*)theirIdentityKey theirOneTimeKey:(NSData*)theirOneTimeKey {
-    
+- (void) dealloc {
+    olm_clear_session(_session);
+    free(_session);
 }
 
-- (instancetype) initInboundSessionWithAccount:(OLMAccount*)account oneTimeKeyMessage:(NSData*)oneTimeKeyMessage {
-    
+- (BOOL) initializeSessionMemory {
+    size_t size = olm_session_size();
+    _session = malloc(size);
+    NSParameterAssert(_session != nil);
+    if (!_session) {
+        return NO;
+    }
+    _session = olm_session(_session);
+    NSParameterAssert(_session != nil);
+    if (!_session) {
+        return NO;
+    }
+    return YES;
 }
 
-- (instancetype) initInboundSessionWithAccount:(OLMAccount*)account theirIdentityKey:(NSData*)theirIdentityKey oneTimeKeyMessage:(NSData*)oneTimeKeyMessage {
-    
+- (instancetype) initWithAccount:(OLMAccount*)account {
+    self = [super init];
+    if (!self) {
+        return nil;
+    }
+    BOOL success = [self initializeSessionMemory];
+    if (!success) {
+        return nil;
+    }
+    _account = account;
+    return self;
+}
+
+- (instancetype) initOutboundSessionWithAccount:(OLMAccount*)account theirIdentityKey:(NSString*)theirIdentityKey theirOneTimeKey:(NSString*)theirOneTimeKey {
+    self = [self initWithAccount:account];
+    if (!self) {
+        return nil;
+    }
+    NSMutableData *random = [OLMUtility randomBytesOfLength:olm_create_outbound_session_random_length(_session)];
+    NSData *idKey = [theirIdentityKey dataUsingEncoding:NSUTF8StringEncoding];
+    NSData *otKey = [theirOneTimeKey dataUsingEncoding:NSUTF8StringEncoding];
+    size_t result = olm_create_outbound_session(_session, account.account, idKey.bytes, idKey.length, otKey.bytes, otKey.length, random.mutableBytes, random.length);
+    if (result == olm_error()) {
+        const char *error = olm_session_last_error(_session);
+        NSAssert(NO, @"olm_create_outbound_session error: %s", error);
+        return nil;
+    }
+    return self;
+}
+
+- (instancetype) initInboundSessionWithAccount:(OLMAccount*)account oneTimeKeyMessage:(NSString*)oneTimeKeyMessage {
+    self = [self initWithAccount:account];
+    if (!self) {
+        return nil;
+    }
+    BOOL success = [self initializeSessionMemory];
+    if (!success) {
+        return nil;
+    }
+    NSMutableData *otk = [NSMutableData dataWithData:[oneTimeKeyMessage dataUsingEncoding:NSUTF8StringEncoding]];
+    size_t result = olm_create_inbound_session(_session, account.account, otk.mutableBytes, oneTimeKeyMessage.length);
+    if (result == olm_error()) {
+        const char *error = olm_session_last_error(_session);
+        NSAssert(NO, @"olm_create_inbound_session error: %s", error);
+        return nil;
+    }
+    return self;
+}
+
+- (instancetype) initInboundSessionWithAccount:(OLMAccount*)account theirIdentityKey:(NSString*)theirIdentityKey oneTimeKeyMessage:(NSString*)oneTimeKeyMessage {
+    self = [self initWithAccount:account];
+    if (!self) {
+        return nil;
+    }
+    BOOL success = [self initializeSessionMemory];
+    if (!success) {
+        return nil;
+    }
+    NSData *idKey = [theirIdentityKey dataUsingEncoding:NSUTF8StringEncoding];
+    NSMutableData *otk = [NSMutableData dataWithData:[oneTimeKeyMessage dataUsingEncoding:NSUTF8StringEncoding]];
+    size_t result = olm_create_inbound_session_from(_session, account.account, idKey.bytes, idKey.length, otk.mutableBytes, otk.length);
+    if (result == olm_error()) {
+        const char *error = olm_session_last_error(_session);
+        NSAssert(NO, @"olm_create_inbound_session_from error: %s", error);
+        return nil;
+    }
+    return self;
+}
+
+- (NSString*) sessionIdentifier {
+    size_t length = olm_session_id_length(_session);
+    NSMutableData *idData = [NSMutableData dataWithLength:length];
+    if (!idData) {
+        return nil;
+    }
+    size_t result = olm_session_id(_session, idData.mutableBytes, idData.length);
+    if (result == olm_error()) {
+        const char *error = olm_session_last_error(_session);
+        NSAssert(NO, @"olm_session_id error: %s", error);
+        return nil;
+    }
+    NSString *idString = [[NSString alloc] initWithData:idData encoding:NSUTF8StringEncoding];
+    return idString;
+}
+
+- (OLMMessage*) encryptMessage:(NSString*)message {
+    size_t messageType = olm_encrypt_message_type(_session);
+    size_t randomLength = olm_encrypt_random_length(_session);
+    NSMutableData *random = [OLMUtility randomBytesOfLength:randomLength];
+    NSData *plaintextData = [message dataUsingEncoding:NSUTF8StringEncoding];
+    size_t ciphertextLength = olm_encrypt_message_length(_session, plaintextData.length);
+    NSMutableData *ciphertext = [NSMutableData dataWithLength:ciphertextLength];
+    if (!ciphertext) {
+        return nil;
+    }
+    size_t result = olm_encrypt(_session, plaintextData.bytes, plaintextData.length, random.mutableBytes, random.length, ciphertext.mutableBytes, ciphertext.length);
+    if (result == olm_error()) {
+        const char *error = olm_session_last_error(_session);
+        NSAssert(NO, @"olm_encrypt error: %s", error);
+        return nil;
+    }
+    NSString *ciphertextString = [[NSString alloc] initWithData:ciphertext encoding:NSUTF8StringEncoding];
+    OLMMessage *encryptedMessage = [[OLMMessage alloc] initWithCiphertext:ciphertextString type:messageType];
+    return encryptedMessage;
+}
+
+- (BOOL) removeOneTimeKeys {
+    size_t result = olm_remove_one_time_keys(_account.account, _session);
+    if (result == olm_error()) {
+        const char *error = olm_session_last_error(_session);
+        NSAssert(NO, @"olm_remove_one_time_keys error: %s", error);
+        return NO;
+    }
+    return YES;
+}
+
+- (NSString*) decryptMessage:(OLMMessage*)message {
+    NSParameterAssert(message != nil);
+    NSData *messageData = [message.ciphertext dataUsingEncoding:NSUTF8StringEncoding];
+    if (!messageData) {
+        return nil;
+    }
+    NSMutableData *mutMessage = messageData.mutableCopy;
+    size_t maxPlaintextLength = olm_decrypt_max_plaintext_length(_session, message.type, mutMessage.mutableBytes, mutMessage.length);
+    if (maxPlaintextLength == olm_error()) {
+        const char *error = olm_session_last_error(_session);
+        NSAssert(NO, @"olm_decrypt_max_plaintext_length error: %s", error);
+        return nil;
+    }
+    // message buffer is destroyed by olm_decrypt_max_plaintext_length
+    mutMessage = messageData.mutableCopy;
+    NSMutableData *plaintextData = [NSMutableData dataWithLength:maxPlaintextLength];
+    size_t plaintextLength = olm_decrypt(_session, message.type, mutMessage.mutableBytes, mutMessage.length, plaintextData.mutableBytes, plaintextData.length);
+    if (plaintextLength == olm_error()) {
+        const char *error = olm_session_last_error(_session);
+        NSAssert(NO, @"olm_decrypt error: %s", error);
+        return nil;
+    }
+    plaintextData.length = plaintextLength;
+    NSString *plaintext = [[NSString alloc] initWithData:plaintextData encoding:NSUTF8StringEncoding];
+    return plaintext;
 }
 
 @end