Update Cocoapods.

SignalServiceKit/src/Util/NSData+OWS.h

@@ -2,15 +2,12 @@
 //  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
+#import <AxolotlKit/NSData+SPK.h>
+
 NS_ASSUME_NONNULL_BEGIN
 
 @interface NSData (OWS)
 
-/**
- * Compares data in constant time so as to help avoid potential timing attacks.
- */
-- (BOOL)ows_constantTimeIsEqualToData:(NSData *)other;
-
 - (NSData *)dataByAppendingData:(NSData *)data;
 
 - (NSString *)hexadecimalString;

SignalServiceKit/src/Util/NSData+OWS.m

@@ -8,25 +8,6 @@ NS_ASSUME_NONNULL_BEGIN
 
 @implementation NSData (OWS)
 
-- (BOOL)ows_constantTimeIsEqualToData:(NSData *)other
-{
-    volatile UInt8 isEqual = 0;
-
-    if (self.length != other.length) {
-        return NO;
-    }
-
-    UInt8 *leftBytes = (UInt8 *)self.bytes;
-    UInt8 *rightBytes = (UInt8 *)other.bytes;
-    for (int i = 0; i < self.length; i++) {
-        // rather than returning as soon as we find a discrepency, we compare the rest of
-        // the byte stream to maintain a constant time comparison
-        isEqual |= leftBytes[i] ^ rightBytes[i];
-    }
-
-    return isEqual == 0;
-}
-
 - (NSData *)dataByAppendingData:(NSData *)data
 {
     NSMutableData *result = [self mutableCopy];