OpenSSL – Generating SHA-256 Hash

openssl

I'm trying to use openssl to create a cryptographic hash of a file using HMAC-SHA-256. I'm confused as to why I'm seeing a 'no such file or directory' error on the output.

The key I'm using is in a file called mykey.txt.

This is my command:

openssl dgst -sha256 -hmac -hex hexkey:$(cat mykey.txt) -out hmac.txt /bin/ps

And the output

Best Answer

openssl dgst -sha256 -hmac -hex -macopt hexkey:$(cat mykey.txt) -out hmac.txt /bin/ps

Related Solutions

Why does openssl print to stderr for a successful command

Messages to the users go on stderr. What goes to stdout is the result of the openssl command.

By default, unless you use -in or -out, openssl takes data (keys, certificates...) in from stdin and writes data out on stdout (the result like the request pem file).

In a shell you typically use it as:

openssl cmd < in.pem > out.pem

You don't want the messages to the user to end up in out.pem which is why they are issued on stderr.

Openssl is not creating certificates with expected expiration date

The certificate validity should be specified in the last step as in:

openssl x509 -req -in server.csr -CA CA.crt -CAkey CA.key -CAcreateserial -out server.crt -sha256 -days 365

Otherwise, while you are requesting 365 days while creating the CSR, when you sign it the signing default configuration overrides the days of the CSR request.

Best Answer

Related Solutions

Why does openssl print to stderr for a successful command

Openssl is not creating certificates with expected expiration date

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