1 files changed, 37 insertions, 0 deletions
diff --git a/xcode/OLMKit/OLMUtility.h b/xcode/OLMKit/OLMUtility.h
new file mode 100644
index 0000000..1952b8e
--- /dev/null
+++ b/xcode/OLMKit/OLMUtility.h
@@ -0,0 +1,37 @@
+//
+//  OLMUtility.h
+//  olm
+//
+//  Created by Chris Ballinger on 4/8/16.
+//
+//
+
+#import <Foundation/Foundation.h>
+
+@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