Decrypt a symmetric password encrypted string using openssl, and put it in the x-clipboard (`shift + insert` to paste) uing xclip

passcrypt.sh

# Example to create an encrypted string:
# echo "hi"|openssl aes-256-cbc -a

# the decryption example below is for password "pass"

# requires openssl and xclip

give-my-token() {
    # Using 1.1.0+
    echo "U2FsdGVkX1/uwQA5Uc/F8vTYJEWZcgcuY+V9DVQovNs="|openssl aes-256-cbc -a -d 2>/dev/null|xclip || {
        echo "Could not decrypt."
        return 1
    }
    echo "(written to x-clipboard)"
}

Note that the versions of OpenSSL must match to decrypt data OpenSSL may break compatibility between versions. For example, data encrypted with OpenSSL 1.0.2g 1 Mar 2016 cannot be decrypted using OpenSSL 1.1.0g 2 Nov 2017 and a correct password.

This was due to a change in hash algorithm in the lead-up to 1.1.0 and a workaround can be used to force the old behaviour. For obvious reasons, it's best to use the new behaviour, and update all encrypted files where appropriate.

To decrypt an old ciphertext with 1.1.0+, use the arguments -md md5 (-md was added to openssl sometime between the aforementioned versions precisely for this compatibility workaround)