crypto module digital signature does not work

[Yaron Naveh]

Hi

I am trying to generate a digital signature using the crypto module
for node.js (0.6.15). The following code prints nothing (on both a
windows and a linux machine) and res is of length 0. Also signer never
throws an exception no matter what dummy input I give as key. openssl
is installed in version 1.0.1. What am I doing wrong?


var crypto = require('crypto');
var signer = crypto.createSign("RSA-SHA1")
signer.update("sign me!")

//dummy key
var private_key =
"MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAL4vpoH3H3byehjj" +
"7RAGxefGRATiq4mXtzc9Q91W7uT0DTaFEbjzVch9aGsNjmLs4QHsoZbuoUmi0st4"
+
"x5z9SQpTAKC/dW8muzacT3E7dJJYh03MAO6RiH4LG34VRTq1SQN6qDt2rCK85eG4"
+
"5NHI4jceptZNu6Zot1zyO5/PYuFpAgMBAAECgYAhspeyF3M/xB7WIixy1oBiXMLY"
+
"isESFAumgfhwU2LotkVRD6rgNl1QtMe3kCNWa9pCWQcYkxeI0IzA+JmFu2shVvoR"
+
"oL7eV4VCe1Af33z24E46+cY5grxNhHt/LyCnZKcitvCcrzXExUc5n6KngX0mMKgk"
+
"W7skZDwsnKzhyUV8wQJBAN2bQMeASQVOqdfqBdFgC/NPnKY2cuDi6h659QN1l+kg"
+
"X3ywdZ7KKftJo1G9l45SN9YpkyEd9zEO6PMFaufJvZUCQQDbtAWxk0i8BT3UTNWC"
+
"T/9bUQROPcGZagwwnRFByX7gpmfkf1ImIvbWVXSpX68/IjbjSkTw1nj/Yj1NwFZ0"
+
"nxeFAkEAzPhRpXVBlPgaXkvlz7AfvY+wW4hXHyyi0YK8XdPBi25XA5SPZiylQfjt"
+
"Z6iN6qSfYqYXoPT/c0/QJR+orvVJNQJBANhRPNXljVTK2GDCseoXd/ZiI5ohxg+W"
+
"UaA/1fDvQsRQM7TQA4NXI7BO/YmSk4rW1jIeOxjiIspY4MFAIh+7UL0CQFL6zTg6"
+
"wfeMlEZzvgqwCGoLuvTnqtvyg45z7pfcrg2cHdgCXIy9kErcjwGiu6BOevEA1qTW"
+
"Rk+bv0tknWvcz/s="

var res = signer.sign(private_key, output_format='base64')
console.log(res);

Thanks,
Yaron

[Ben Noordhuis]

Your key needs to be in PEM format, it should have -----BEGIN RSA
PRIVATE KEY----- and -----END RSA PRIVATE KEY----- markers.