Online SHA256 Hash Generator

Looking for some review of this flow so I can pinpoint where the signing calculation is going wrong.

The main issue is in generating the signing key and signature--the hashing of the canonical request seems to match the reference here http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-query-string-auth.html

I put up a small repo that is easy to install and run, I'm running with npm 5.3.0 and node 8.1.4, but it should work with almost any version that supports the same crypto functions.

https://github.com/notbrain/awsv4-s3-pre-signed-url

The sha256hmac and getSignature functions look like this:

function sha256hmac(key, string, encoding = 'hex') {  return crypto.createHmac('sha256', key).update(string, 'utf8').digest(encoding);};function getSignature(stringToSign, signingDates) {  const dateKey              = sha256hmac('AWS4' + S3_SECRET_KEY, signingDates.shortDate);  const dateRegionKey        = sha256hmac(dateKey, S3_REGION);  const dateRegionServiceKey = sha256hmac(dateRegionKey, S3_SERVICE);  const signingKey           = sha256hmac(dateRegionServiceKey, S3_REQUEST_TYPE);  const signature = sha256hmac(signingKey, stringToSign);  return signature;}

Thanks for looking!

I've been using the following to correctly verify S/MIME documents with SHA1 signatures, but I recently have come upon the need to do the same with SHA256 signatures as SHA1s have been shown to be insecure.

# openssl smime -verify -noverify -inform SMIME -certfile cert.pem -in rawfile.txt -out verified.txt

Has anyone done this? I've tried adding switches:

openssl sha -sha256

As was suggested when verifying just the digest files, but it throws an error.

Ultimately I'm looking to do this via PHP with something like openssl_pkcs7_verify, but I've not gotten even the commandline to work, yet so I'm stumped.

This is on centOS, OpenSSL 1.0.1e-fips 11 Feb 2013

I have some string and I want to hash it with the SHA-256 hash function using C#. I want something like this:

 string hashString = sha256_hash("samplestring");

Is there something built into the framework to do this?

In the Free Pascal libraries there's a hash library that enables use of MD5 and SHA1 hashing algorithms (http://wiki.freepascal.org/hash). But what if I wanted to use a higher one, such as SHA256 or SHA512? Could I achieve this using Free Pascal? Searching the FP Wiki retunrs zero hits for SHA256\SHA512.

I'm trying to do login to my site using jmeter tool.

But when I entered a valid username and password and press the submit button, inside the browser you can check that one post request is getting fired with encrypted values.

So, due to encrypted values of username and password. I am not able to do login to the site.

Note: SHA-256 algorithm is used for encryption.

For more details on this issue, please refer below mentioned image.

So, can anyone help me how do I able to do login to my site?