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b42f528713
Also: * use system cookie parsing * add AESGCM additional authenticated data parameter // FREEBIE
101 lines
3.7 KiB
Objective-C
Executable file
101 lines
3.7 KiB
Objective-C
Executable file
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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NS_ASSUME_NONNULL_BEGIN
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extern const NSUInteger kAES256_KeyByteLength;
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/// Key appropriate for use in AES256-GCM
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@interface OWSAES256Key : NSObject <NSSecureCoding>
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/// Generates new secure random key
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- (instancetype)init;
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+ (instancetype)generateRandomKey;
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/**
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* @param data representing the raw key bytes
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*
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* @returns a new instance if key is of appropriate length for AES256-GCM
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* else returns nil.
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*/
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+ (nullable instancetype)keyWithData:(NSData *)data;
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/// The raw key material
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@property (nonatomic, readonly) NSData *keyData;
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@end
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@interface AES25GCMEncryptionResult : NSObject
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@property (nonatomic, readonly) NSData *ciphertext;
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@property (nonatomic, readonly) NSData *initializationVector;
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@property (nonatomic, readonly) NSData *authTag;
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- (nullable instancetype)initWithCipherText:(NSData *)cipherText
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initializationVector:(NSData *)initializationVector
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authTag:(NSData *)authTag NS_DESIGNATED_INITIALIZER;
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@end
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@interface Cryptography : NSObject
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typedef NS_ENUM(NSInteger, TSMACType) {
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TSHMACSHA1Truncated10Bytes = 1,
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TSHMACSHA256Truncated10Bytes = 2,
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TSHMACSHA256AttachementType = 3
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};
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+ (NSData *)generateRandomBytes:(NSUInteger)numberBytes;
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+ (uint32_t)randomUInt32;
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+ (uint64_t)randomUInt64;
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#pragma mark SHA and HMAC methods
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// Full length SHA256 digest for `data`
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+ (NSData *)computeSHA256Digest:(NSData *)data;
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// Truncated SHA256 digest for `data`
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+ (NSData *)computeSHA256Digest:(NSData *)data truncatedToBytes:(NSUInteger)truncatedBytes;
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+ (NSString *)truncatedSHA1Base64EncodedWithoutPadding:(NSString *)string;
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+ (NSString *)computeSHA1DigestForString:(NSString *)input;
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+ (NSData *)computeSHA256HMAC:(NSData *)dataToHMAC withHMACKey:(NSData *)HMACKey;
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+ (NSData *)computeSHA1HMAC:(NSData *)dataToHMAC withHMACKey:(NSData *)HMACKey;
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+ (NSData *)truncatedSHA1HMAC:(NSData *)dataToHMAC withHMACKey:(NSData *)HMACKey truncation:(NSUInteger)bytes;
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+ (NSData *)decryptAppleMessagePayload:(NSData *)payload withSignalingKey:(NSString *)signalingKeyString;
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#pragma mark encrypt and decrypt attachment data
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// Though digest can and will be nil for legacy clients, we now reject attachments lacking a digest.
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+ (NSData *)decryptAttachment:(NSData *)dataToDecrypt
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withKey:(NSData *)key
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digest:(nullable NSData *)digest
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unpaddedSize:(UInt32)unpaddedSize
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error:(NSError **)error;
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+ (NSData *)encryptAttachmentData:(NSData *)attachmentData
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outKey:(NSData *_Nonnull *_Nullable)outKey
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outDigest:(NSData *_Nonnull *_Nullable)outDigest;
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+ (nullable AES25GCMEncryptionResult *)encryptAESGCMWithData:(NSData *)plaintext
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additionalAuthenticatedData:(nullable NSData *)additionalAuthenticatedData
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key:(OWSAES256Key *)key
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NS_SWIFT_NAME(encryptAESGCM(plainTextData:additionalAuthenticatedData:key:));
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+ (nullable NSData *)decryptAESGCMWithInitializationVector:(NSData *)initializationVector
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ciphertext:(NSData *)ciphertext
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additionalAuthenticatedData:(nullable NSData *)additionalAuthenticatedData
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authTag:(NSData *)authTagFromEncrypt
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key:(OWSAES256Key *)key;
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+ (nullable NSData *)encryptAESGCMWithProfileData:(NSData *)plaintextData key:(OWSAES256Key *)key;
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+ (nullable NSData *)decryptAESGCMWithProfileData:(NSData *)encryptedData key:(OWSAES256Key *)key;
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@end
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NS_ASSUME_NONNULL_END
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