Dart Requires Chilkat v11.0.0+

RSA Signature using Private Key from .snk File

See more RSA Examples

A .snk file (Strong Name Key file) is a file format used in the .NET ecosystem to store an RSA public/private key pair. This key pair is typically used for strong-naming assemblies, which is a process of signing .NET assemblies to ensure their integrity and to uniquely identify them.

This example loads a private key from a .snk file and creates an RSA signature.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final rsa = CkRsa();

  // Load the .snk and return the private key as XML.
  final String xmlStr;
  try {
    xmlStr = rsa.snkToXml('./test.snk');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final privKey = CkPrivateKey();
  try {
    privKey.loadXml(xmlStr);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    rsa.usePrivateKey(privKey);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Sign the SHA-256 hash of the utf-8 byte representation of the contents of sb
  // Return the signature in base64 format.
  rsa.encodingMode = 'base64';
  rsa.charset = 'utf-8';
  final String sigBase64;
  try {
    sigBase64 = rsa.signStringENC('This is the text to be hashed and signed.', 'sha256');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('RSA signature as base64: $sigBase64');
}