To examine a generated key file for example the key size enter the following:
openssl rsa -in website.key -check -text
You will get result like this:
Private-Key: (2048 bit) modulus: <cut> publicExponent: 65537 (0x10001) privateExponent: <cut> prime1: <cut> prime2: <cut> exponent1: <cut> exponent2: <cut> coefficient: <cut> RSA key ok writing RSA key -----BEGIN RSA PRIVATE KEY----- <cut> -----END RSA PRIVATE KEY-----