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//
// OLMUtility.h
// olm
//
// Created by Chris Ballinger on 4/8/16.
//
//
#import <Foundation/Foundation.h>
FOUNDATION_EXPORT NSString *const OLMErrorDomain;
@interface OLMUtility : NSObject
/**
Calculate the SHA-256 hash of the input and encodes it as base64.
@param message the message to hash.
@return the base64-encoded hash value.
*/
- (NSString*)sha256:(NSData*)message;
/**
Verify an ed25519 signature.
@param signature the base64-encoded signature to be checked.
@param key the ed25519 key.
@param message the message which was signed.
@param the result error if there is a problem with the verification.
If the key was too small then the message will be "OLM.INVALID_BASE64".
If the signature was invalid then the message will be "OLM.BAD_MESSAGE_MAC".
@return YES if valid.
*/
- (BOOL)verifyEd25519Signature:(NSString*)signature key:(NSString*)key message:(NSData*)message error:(NSError**)error;
+ (NSMutableData*) randomBytesOfLength:(NSUInteger)length;
@end
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