Convert RSA pem key String to der byte[]

Question

I'm trying to convert an RSA pem key (contained in a String) to a byte[], like this method does when given a .pem file FileInputStream:

http://jets3t.s3.amazonaws.com/api/org/jets3t/service/security/EncryptionUtil.html#convertRsaPemToDer(java.io.InputStream)

I've tried this:

String pemKey = "-----BEGIN RSA PRIVATE KEY-----\r\n"
         + "{base64 encoded key part omitted}\r\n"
         + "{base64 encoded key part omitted}\r\n"
         + "{base64 encoded key part omitted}\r\n"
         + "-----END RSA PRIVATE KEY-----";
String base64 = pemKey
        .replaceAll("\\s", "")
        .replace("-----BEGINRSAPRIVATEKEY-----", "")
        .replace("-----ENDRSAPRIVATEKEY-----", "");

return Base64.decode(base64.getBytes());

I expect the result to be equivalent to what would be returned by org.jets3t.service.security.EncryptionUtil.convertRsaPemToDer() but it does not seem to be working when generating a CloudFront streaming URL.

Any idea what I'm doing wrong?

Stefano Sanfilippo · Accepted Answer · 2014-01-16 22:12:12Z

3

Just wrap the string in a ByteArrayInputStream and you can use the method you linked:

InputStream pemStream = new ByteArrayInputStream(pemKey.getBytes());
byte[] derKey = EncryptionUtil.convertRsaPemToDer(pemStream);

answered Jan 16, 2014 at 22:12

Stefano Sanfilippo

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1 Comment

Shaun Scovil Over a year ago

Thanks! My method was yielding the same result; it looks like the problem lies elsewhere...

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