Obj-C: Hashing algorithms (SHA256, etc)Sun, Dec 1, 2013
Having spent a lot of time programming in C#, where the .NET Framework can really spoil a developer, I was shocked to find no pretty interface in Apple’s Cocoa frameworks for hashing NSStrings and NSData. Quite literally developers need to use the CommonCrypto functions themselves.
While it’s only a few lines of code using CommonCrypto, I’m a big fan of once and once-only and it really should be a single line of code and no more, so I put together categories for NSData and NSString that reduce all of CommonCryptos hashing algorithms (MD2, MD4, MD5, SHA1, SHA224, SHA256, SHA384, SHA512) to simple one-line method calls.
Import the header:
And then call the hashing methods:
NSString *filePath = @"/Users/Wookie/myfile.txt"; NSString *filePathHashStr = [filePath stringByHashingWithSHA256UsingEncoding:NSUTF8StringEncoding]; NSData *filePathHash = [filePath dataByHashingWithSHA256UsingEncoding:NSUTF8StringEncoding];
Get CocoaHash on Github.