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21 Oct 2012
I recently went through the processing of creating SDKs for an in house API. The API required signing every REST request with HMAC SHA256 signatures. Those signatures then needed to be converted to base64. Amazon S3 uses base64 strings for their hashes. There are some good reasons to use base64 encoding. See the stackOverflow question What is the use of base 64 encoding?
Below are some simplified HMAC SHA 256 solutions. They should all output
qnR8UCqJggD55PohusaBNviGoOJ67HC6Btry4qXLVZc= given the values of secret and Message . Take notice of the capital M. The hashed message is case sensitive.
Jump to an implementation:
Javascript HMAC SHA256
Run the code online with this jsfiddle.Dependent upon an open source js library called http://code.google.com/p/crypto-js/.
PHP HMAC SHA256
PHP has built in methods for hash_hmac (PHP 5) and base64_encode (PHP 4, PHP 5) resulting in nooutside dependencies. Say what you want about PHP but they have the cleanest code for this example.
Java HMAC SHA256
Dependent on Apache Commons Codec to encode in base64.
Secret Key IndonesiaGroovy HMAC SHA256
It is mostly java code but there are some slight differences. Adapted from Dev Takeout - Groovy HMAC/SHA256 representation.
C# HMAC SHA256Objective C and Cocoa HMAC SHA256
Most of the code required was for converting to bae64 and working the NSString and NSData data types.
Go programming language - Golang HMAC SHA256Ruby HMAC SHA256Java Generate Secret Key From String
Requires openssl and base64.
Python (2.7) HMAC SHA256Generate String From Regex
Tested with Python 2.7.6. Also, be sure not to name your python demo script the same as one of the imported libraries.
Python (3.7) HMAC SHA256
Tested with Python 3.7.0. Also, be sure not to name your python demo script the same as one of the imported libraries. Thanks to @biswapanda.
Perl HMAC SHA256
See Digest::SHA documentation. By convention, the Digest modules do not pad their Base64 output. To fix this you can test the length of the hash and append equal signs '=' until it is the length is a multiple of 4. We will use a modulus function below.
Dart HMAC SHA256
Dependent upon the Dart crypto package.
Swift HMAC SHA256![]()
I have not verified but see this stackOverflow post
Generate Secret Key From String YoutubeRust
Take a look at the alco/rust-digest repository for Rust (lang) guidance. I have not verified yet.
Generate Secret Key From String JavaPowershell (Windows) HMAC SHA256
Mostly wrapping of .NET libraries but useful to see it in powershell's befuddling syntax. See code as gist
Shell (Bash etc) HMAC SHA256
Using openssl. Credit to @CzechJiri
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