`decrypt` throws when using single line private key after update to `2.0.0`

[christian-hawk]

Description

After upgrading to version 2.0.0, decrypt throws when using single line private key. (without pvk header/footer and without line breaks). As reported in node-saml/passport-saml#672 and https://github.com/GluuFederation/inbound-saml/issues/154 .

This is happening because 'node-forge' used to accept a "single line" certificate in private_key = pki.privateKeyFromPem(options.key) (check commit 7aaa734). But now, after this commit, crypto module is in use:

node-xml-encryption/lib/xmlenc.js

Line 258 in e8df80c

var decrypted = crypto.privateDecrypt({ key: options.key, padding: padding}, key);

Provide a clear and concise description of the issue, including what you expected to happen.

Reproduction

const rsaKey = fs.readFileSync(__dirname + '/your_private_key.key')
	.replace(/(\r\n|\n|\r)/gm, '')
    .replace('-----BEGIN RSA PRIVATE KEY-----', '')
    .replace('-----END RSA PRIVATE KEY-----', '')

const options = {
    key: rsaKey
}

xmlenc.decrypt('<xenc:EncryptedData ..... </xenc:EncryptedData>', options, function(err, result) {
	if(err) { 
		throw new Error(err)
	}
    console.log(result);
}

output:

Error: error:0909006C:PEM routines:get_name:no start line
    at Object.privateDecrypt (node:internal/crypto/cipher:79:12)
    at decryptKeyInfoWithScheme (/root/inbound-saml-0.17.0/node_modules/xml-encryption/lib/xmlenc.js:258:26)
    at decryptKeyInfo (/root/inbound-saml-0.17.0/node_modules/xml-encryption/lib/xmlenc.js:246:14)
    at Object.decrypt (/root/inbound-saml-0.17.0/node_modules/xml-encryption/lib/xmlenc.js:187:24)

Environment

Please provide the following:

• Version of this library used: 2.0.0

Adicional Context

Even if that depends on a lib (node-forge/crypto), this change caused downstream modules to BREAK, so from a design perspective it's still an UNDOCUMENTED BREAKING CHANGE, even that it may also be treated as a bug to (hot)fix.

[christian-hawk]

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