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Merge pull request #286 from CleverTap/develop
Release v5.2.0
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| #import <Foundation/Foundation.h> | ||
| #import "CleverTap.h" | ||
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| @interface CTAES : NSObject | ||
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| /** | ||
| * Returns AES128 encrypted string using the crypto framework. | ||
| */ | ||
| - (NSString *)getEncryptedString:(NSString *)identifier; | ||
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| /** | ||
| * Returns AES128 decrypted string using the crypto framework. | ||
| */ | ||
| - (NSString *)getDecryptedString:(NSString *)identifier; | ||
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| - (instancetype)initWithAccountID:(NSString *)accountID encryptionLevel:(CleverTapEncryptionLevel)encryptionLevel isDefaultInstance:(BOOL)isDefaultInstance; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,178 @@ | ||
| #import <CommonCrypto/CommonCryptor.h> | ||
| #import "CTAES.h" | ||
| #import "CTConstants.h" | ||
| #import "CTPreferences.h" | ||
| #import "CTUtils.h" | ||
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| NSString *const kENCRYPTION_KEY = @"CLTAP_ENCRYPTION_KEY"; | ||
| NSString *const kCRYPT_KEY_PREFIX = @"Lq3fz"; | ||
| NSString *const kCRYPT_KEY_SUFFIX = @"bLti2"; | ||
| NSString *const kCacheGUIDS = @"CachedGUIDS"; | ||
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| @interface CTAES () {} | ||
| @property (nonatomic, strong) NSString *accountID; | ||
| @property (nonatomic, assign) CleverTapEncryptionLevel encryptionLevel; | ||
| @property (nonatomic, assign) BOOL isDefaultInstance; | ||
| @end | ||
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| @implementation CTAES | ||
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| - (instancetype)initWithAccountID:(NSString *)accountID | ||
| encryptionLevel:(CleverTapEncryptionLevel)encryptionLevel | ||
| isDefaultInstance:(BOOL)isDefaultInstance { | ||
| if (self = [super init]) { | ||
| _accountID = accountID; | ||
| _isDefaultInstance = isDefaultInstance; | ||
| [self updateEncryptionLevel:encryptionLevel]; | ||
| } | ||
| return self; | ||
| } | ||
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| - (void)updateEncryptionLevel:(CleverTapEncryptionLevel)encryptionLevel { | ||
| _encryptionLevel = encryptionLevel; | ||
| long lastEncryptionLevel = [CTPreferences getIntForKey:[CTUtils getKeyWithSuffix:kENCRYPTION_KEY accountID:_accountID] withResetValue:0]; | ||
| if (lastEncryptionLevel != _encryptionLevel) { | ||
| CleverTapLogStaticInternal(@"CleverTap Encryption level changed for account: %@ to: %d", _accountID, _encryptionLevel); | ||
| [self updatePreferencesValues]; | ||
| if (!_isDefaultInstance) { | ||
| // For Default instance, we are updating this after updating Local DB values on App Launch. | ||
| [CTPreferences putInt:_encryptionLevel forKey:[CTUtils getKeyWithSuffix:kENCRYPTION_KEY accountID:_accountID]]; | ||
| } | ||
| } | ||
| } | ||
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| - (void)updatePreferencesValues { | ||
| NSDictionary *cachedGUIDS = [CTPreferences getObjectForKey:[CTUtils getKeyWithSuffix:kCacheGUIDS accountID:_accountID]]; | ||
| if (cachedGUIDS) { | ||
| NSMutableDictionary *newCache = [NSMutableDictionary new]; | ||
| if (_encryptionLevel == CleverTapEncryptionNone) { | ||
| [cachedGUIDS enumerateKeysAndObjectsUsingBlock:^(NSString* _Nonnull cachedKey, NSString* _Nonnull value, BOOL * _Nonnull stopp) { | ||
| NSString *key = [self getCachedKey:cachedKey]; | ||
| NSString *identifier = [self getCachedIdentifier:cachedKey]; | ||
| NSString *decryptedString = [self getDecryptedString:identifier]; | ||
| NSString *cacheKey = [NSString stringWithFormat:@"%@_%@", key, decryptedString]; | ||
| newCache[cacheKey] = value; | ||
| }]; | ||
| } else if (_encryptionLevel == CleverTapEncryptionMedium) { | ||
| [cachedGUIDS enumerateKeysAndObjectsUsingBlock:^(NSString* _Nonnull cachedKey, NSString* _Nonnull value, BOOL * _Nonnull stopp) { | ||
| NSString *key = [self getCachedKey:cachedKey]; | ||
| NSString *identifier = [self getCachedIdentifier:cachedKey]; | ||
| NSString *encryptedString = [self getEncryptedString:identifier]; | ||
| NSString *cacheKey = [NSString stringWithFormat:@"%@_%@", key, encryptedString]; | ||
| newCache[cacheKey] = value; | ||
| }]; | ||
| } | ||
| [CTPreferences putObject:newCache forKey:[CTUtils getKeyWithSuffix:kCacheGUIDS accountID:_accountID]]; | ||
| } | ||
| } | ||
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| - (NSString *)getEncryptedString:(NSString *)identifier { | ||
| NSString *encryptedString = identifier; | ||
| if (_encryptionLevel == CleverTapEncryptionMedium) { | ||
| @try { | ||
| NSData *dataValue = [identifier dataUsingEncoding:NSUTF8StringEncoding]; | ||
| NSData *encryptedData = [self convertData:dataValue withOperation:kCCEncrypt]; | ||
| if (encryptedData) { | ||
| encryptedString = [encryptedData base64EncodedStringWithOptions:kNilOptions]; | ||
| } | ||
| } @catch (NSException *e) { | ||
| CleverTapLogStaticInternal(@"Error: %@ while encrypting the string: %@", e.debugDescription, identifier); | ||
| return identifier; | ||
| } | ||
| } | ||
| return encryptedString; | ||
| } | ||
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| - (NSString *)getDecryptedString:(NSString *)identifier { | ||
| NSString *decryptedString = identifier; | ||
| @try { | ||
| NSData *dataValue = [[NSData alloc] initWithBase64EncodedString:identifier options:kNilOptions]; | ||
| NSData *decryptedData = [self convertData:dataValue withOperation:kCCDecrypt]; | ||
| if (decryptedData && decryptedData.length > 0) { | ||
| NSString *utf8EncodedString = [[NSString alloc] initWithData:decryptedData encoding:NSUTF8StringEncoding]; | ||
| if (utf8EncodedString) { | ||
| decryptedString = utf8EncodedString; | ||
| } | ||
| } | ||
| } @catch (NSException *e) { | ||
| CleverTapLogStaticInternal(@"Error: %@ while decrypting the string: %@", e.debugDescription, identifier); | ||
| return identifier; | ||
| } | ||
| return decryptedString; | ||
| } | ||
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| - (NSData *)convertData:(NSData *)data | ||
| withOperation:(CCOperation)operation { | ||
| NSData *outputData = [self AES128WithOperation:operation | ||
| key:[self generateKeyPassword] | ||
| identifier:CLTAP_ENCRYPTION_IV | ||
| data:data]; | ||
| return outputData; | ||
| } | ||
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| - (NSData *)AES128WithOperation:(CCOperation)operation | ||
| key:(NSString *)key | ||
| identifier:(NSString *)identifier | ||
| data:(NSData *)data { | ||
| // Note: The key will be 0's but we intentionally are keeping it this way to maintain | ||
| // compatibility. The correct code is: | ||
| // char keyPtr[[key length] + 1]; | ||
| char keyCString[kCCKeySizeAES128 + 1]; | ||
| memset(keyCString, 0, sizeof(keyCString)); | ||
| [key getCString:keyCString maxLength:sizeof(keyCString) encoding:NSUTF8StringEncoding]; | ||
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| char identifierCString[kCCBlockSizeAES128 + 1]; | ||
| memset(identifierCString, 0, sizeof(identifierCString)); | ||
| [identifier getCString:identifierCString | ||
| maxLength:sizeof(identifierCString) | ||
| encoding:NSUTF8StringEncoding]; | ||
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| size_t outputAvailableSize = [data length] + kCCBlockSizeAES128; | ||
| void *output = malloc(outputAvailableSize); | ||
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| size_t outputMovedSize = 0; | ||
| CCCryptorStatus cryptStatus = CCCrypt(operation, | ||
| kCCAlgorithmAES128, | ||
| kCCOptionPKCS7Padding, | ||
| keyCString, | ||
| kCCBlockSizeAES128, | ||
| identifierCString, | ||
| [data bytes], | ||
| [data length], | ||
| output, | ||
| outputAvailableSize, | ||
| &outputMovedSize); | ||
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| if (cryptStatus != kCCSuccess) { | ||
| CleverTapLogStaticInternal(@"Failed to encode/deocde the string with error code: %d", cryptStatus); | ||
| free(output); | ||
| return nil; | ||
| } | ||
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| return [NSData dataWithBytesNoCopy:output length:outputMovedSize]; | ||
| } | ||
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| - (NSString *)getCachedKey:(NSString *)value { | ||
| if ([value rangeOfString:@"_"].length > 0) { | ||
| NSUInteger index = [value rangeOfString:@"_"].location; | ||
| return [value substringToIndex:index]; | ||
| } else { | ||
| return nil; | ||
| } | ||
| } | ||
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| - (NSString *)getCachedIdentifier:(NSString *)value { | ||
| if ([value rangeOfString:@"_"].length > 0) { | ||
| NSUInteger index = [value rangeOfString:@"_"].location; | ||
| return [value substringFromIndex:index+1]; | ||
| } else { | ||
| return nil; | ||
| } | ||
| } | ||
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| - (NSString *)generateKeyPassword { | ||
| NSString *keyPassword = [NSString stringWithFormat:@"%@%@%@",kCRYPT_KEY_PREFIX, _accountID, kCRYPT_KEY_SUFFIX]; | ||
| return keyPassword; | ||
| } | ||
|
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| @end |
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