Error: Encryption block is invalid

[0zzone]

I'd like to decode an AES key. This key has been encrypted by a C++ server (openssl) in an old version. Here my code :

`
decryptMessageRSA(encryptedMessageBase64) {

    const privateKey = forge.pki.privateKeyFromPem(this.privateKey);
    const encryptedBytes = forge.util.decode64(encryptedMessageBase64);

    const decryptedBytes = privateKey.decrypt(encryptedBytes, "RSAES-PKCS1-V1_5"); // This line throws an error

    return decryptedBytes
}

`

This code throws : Error: Encryption block is invalid.

Here my params :

Encrypted AES Key
aWfeBuSzcGmN95zJCFFNEgEQOKIeXj3IE4nnvGHmx6nWr0oSsh8qClaE+VvIXszmDGnV1gzfmtIegFKiee2v/Hlkels0JYPhPhMzyggHGP20lKo0joXf58KeH8fo1sHJRo967ca8uDGTJR2G+47yGv9lvrWlQr8RdVcMlndzQPuKCZ6yMNSfTaBGvqG04pFymPCH+UEmjU+5csO6YsHaSuuofBEJT5sj6CMd8clGN9HMFMdSE7XqiZMhgmN/p4XTHAzMVCKbEIvU+q4vT6Q3gKtr3bbpnobr6N4MJ6MC5R1zTtE7TkcNiJMTjRPow+pKtfl2Kb65i/20OSOpLcxnyw==

Private key
-----BEGIN RSA PRIVATE KEY----- MIIEogIBAAKCAQEAlOZTsPEXYIdmwHM2LXwm4pfcfc/4B/1bUGlAW0YMT9IydAZC lkqT3I8splJzEIyx6TrBZlju6Yk2yFhCangQYDE0AfDJSAHrttHfIESvN1/CT+T6 lEQTJxWc90cDEm4Fl7STWMct6hV2I6U+Xkh/IlsRG+X7oCw0PAkwtHXy+WC5gxkJ Ihmto92mD5QuQ1iQzQIRPltzQSiN7x4TPa9uXwfscnXfZL0Z2bmMNRPt61G7AJIY cXJyjhIgLL3yi2ZlJbeAQplu8r8e8GkI/zlHukS/0OYVfzp0YqNp3Bj3WsSC9dQE nau+PmXbUjHVl6Gmje51RZoa/MxhzaRXgUJnAQIDAQABAoIBABS5oniEdj6HWjP7 VVUrbLYpcRVJ9zoVd7pPjBeoPlp15XPk0yvcIYyXmR1laIKrMrBF71lxk3+KC8gD EOuE3rKk5ppGi52sNsTxnV7+cG0CtScttfshJpFQHtMEXVcZXUnqZn/66VcluZXo kC/LY3bCujTp5AY9YN/iX5ceu70eFJvRpx9D4Reb726UqFaAEC6LBE9NpHaGjTFJ 2eiJW0ckckkJn6jq9EcY1QQoVxwUaCvjMzS3VrZKA6DriZuUtDtly/MDjxJaGMPj bKoXK17NwVf2pxxCGD+OM2V6likxTTWnuo9GFoANz8JS0ax1sj7ItbksWYLaX3Df xFns04ECgYEA32kP4vsQzTLSLLR8aHcse3p6TL5eo0xe5G9BrX/xMKo0L7+Se3y2 evTIZ6AtXojqVpD/I3PevzcbLSej54Hkb3Zc6Vvbdmx+i4IUf3FSiV03+z+B9B98 sV+ZB/Wf4nKebeVWTFynzYLK3pLQ6T/SOs/noDInIhIk56CA9Tw6hnkCgYEAqp7F bqTm2mTkb5M36IIgyEw12lMkgFym+56Inuy+MKuvm1EsABhydxkcIkCrpW5RC9uG ol9WM0QV0nB/gf9ImiMlLIQVMP3iavaMM2lPfmDVwhsvghz4oDjpLx0HqDFpMzwF JpLU97BQn3V/dPqZZ+l/xiYxnr3BSbPsgytY4skCgYB0cR/0oAL70Jc28cM9949Z tFZ2FWriFfYHfe1vbpXZVXzpviGs9y1tHJQvXo8HDLmG8P/qDIR2iVRCzrxg95SG e9ylTFkweg/iyqPAYOIx8kIxU8J56Mdm83qhaWYx8qecg8Hc/xX+yULPixoT2E3M lXwWRM2ctnRBvag5KXEfkQKBgESASjQJ8MVuDGjfamrnE9JXBqgJCXafvEr5c1Cb LCDOTUrGZCwFpK88XZdC76cTi2Z/VKaMMEeU5k3+7LJ8k+GOirY8sWViCS14nwFl Ho1Ww3uS/pf2mbt6HeTUeuaEMABp8Id0HBz1pOjge7OziTO3A53CZ9mbxaaZnjNr i9xBAoGAeK1G6Ttqa4STYJX53yOvAtEPHuRMNvOjxFaJYy1BElq25QRBRXkNZlqW aq+hGsr1Hn8vRmAOGOuDBfa8jNaLT92j/R7etQ2yPiws68zLYA09PF0uM6YdWI+m hJ1fCDJEui8uNXVrw+MbI7WGG9GzNuOvsutXJWa+weCA9gRC3dU= -----END RSA PRIVATE KEY-----

[j4k0xb]

Most likely you used the wrong private key or cipher text, because with PKCS#1 v1.5 the raw decrypted data (d) must start with 0x00 0x02 but it's actually 0x61 0x15.

forge/lib/rsa.js

Lines 1273 to 1277 in 2bb97af

	// do rsa decryption w/o any decoding
	var d = pki.rsa.decrypt(data, key, false, false);
	if(scheme === 'RSAES-PKCS1-V1_5') {
	scheme = {decode: _decodePkcs1_v1_5};

forge/lib/rsa.js

Lines 1646 to 1655 in 2bb97af

	// parse the encryption block
	var eb = forge.util.createBuffer(em);
	var first = eb.getByte();
	var bt = eb.getByte();
	if(first !== 0x00 ||
	(pub && bt !== 0x00 && bt !== 0x01) ||
	(!pub && bt != 0x02) ||
	(pub && bt === 0x00 && typeof(ml) === 'undefined')) {
	throw new Error('Encryption block is invalid.');
	}