hmac

I'm trying to create an HMAC-SHA512 signed request for an API call in Python 3.4 using the requests library. I'm trying to follow docs, but am hitting this error: AttributeError: '_hashlib.HASH' object has no attribute 'new' Here's some code. It's failing with the error on the hmac constructor. It's fine if I try and pass hashlib.md5() or omit the digest parameter entirely. I'm not sure if I'm signing the request properly afterwards as I haven't got that far yet. The docs for the service I'm trying to use say to sign the URL with my secret. I need this to be a byte string for this to work.

We are using the below code to generate a HMac hash against a sensitive value in C# public string GenerateHMac(string key, string message) { var decodedKey = Convert.FromBase64String(key); var hasher = new HMACSHA256(decodedKey); var messageBytes = Encoding.Default.GetBytes(message); var hash = hasher.ComputeHash(messageBytes); return Convert.ToBase64String(hash); } The key passed in is a 256 bit base 64 encoded string. A question was raised as to whether we should be using HMACSHA256, HMACSHA384 or HMACSHA512 to hash the value. What are the advantages to using HMACSHA512 over HMACSHA256? Is

This is a follow up to this question, but I'm trying to port C# code to Java instead of Ruby code to C#, as was the case in the related question. I am trying to verify the encrypted signature returned from the Recurly.js api is valid. Unfortunately, Recurly does not have a Java library to assist with the validation, so I must implement the signature validation myself. Per the related question above ( this ), the following C# code can produce the hash needed to validate the signature returned from Recurly: var privateKey = Configuration.RecurlySection.Current.PrivateKey; var hashedKey = SHA1

I am trying to build a working encrypted signature for the Amazon S3 web service, writing a connection library using Objective C. I have run into HMAC SHA-1 digest problems with the ObjC code, so I'm putting that to the side and looking at existing, working Perl code, to try to troubleshoot digest creation. I am testing HMAC SHA-1 digest output from the s3ls command of the Net::Amazon::S3 package and comparing that against the _encode subroutine that I pulled out and put into its own perl script: #!/usr/bin/perl -w use MIME::Base64 qw(encode_base64); use Digest::HMAC_SHA1; use String::Escape

I’m currently facing a big problem (Environment: .NET 4.5 Core): We need to protect a message with a key using a HMAC-SHA1 algorithm. The problem is that the HMACSHA1-class of the namespace System.Security.Cryptography and the namespace itself do not exist in .NET 4.5 Core, this namespace only exists in the normal version of .NET. I tried a lot of ways to find an equivalent namespace for our purpose but the only thing I found was Windows.Security.Cryptography which sadly does not offer a HMAC-Encryption. Does anyone have an idea how I could solve our problem or is there any free to use 3rd

To implement HMAC authentication I made my own filter, provider and token. RestSecurityFilter: public class RestSecurityFilter extends AbstractAuthenticationProcessingFilter { private final Logger LOG = LoggerFactory.getLogger(RestSecurityFilter.class); private AuthenticationManager authenticationManager; public RestSecurityFilter(String defaultFilterProcessesUrl) { super(defaultFilterProcessesUrl); } public RestSecurityFilter(RequestMatcher requiresAuthenticationRequestMatcher) { super(requiresAuthenticationRequestMatcher); } @Override public Authentication attemptAuthentication