In some circumstances there may be a need to have the certificate private key unencrypted.

To remove the private key password follow this procedure:

  1. Copy the private key file into your OpenSSL directory (or you can specify the path in the command line).
  2. Run this command using OpenSSL:
    openssl rsa -in [file1.key] -out [file2.key]

    Enter the passphrase and [file2.key] is now the unprotected private key.

    The output file:  [file2.key] should be unencrypted. To verify this open the file using a text editor (such as MS Notepad) and view the headers.

    Encrypted headers look like this:

    —–BEGIN RSA PRIVATE KEY—–
    Proc-Type: 4,ENCRYPTED DEK-Info: DES-EDE3-CBC,
    6AC307785DD187EF…
    —–END RSA PRIVATE KEY—–
    Unencrypted headers look like this:

    —–BEGIN RSA PRIVATE KEY—–
    6AC307785DD187EF…
    —–END RSA PRIVATE KEY—–

Resource: https://knowledge.digicert.com/solution/SO5292.html