C#

RSA Decrypt using PEM

See more RSA Examples

This example demonstrates decryping RSA encrypted data that is base64 encoded. It uses a private key loaded from a PEM file. C#

bool success = false;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Rsa rsa = new Chilkat.Rsa();

Chilkat.PrivateKey key = new Chilkat.PrivateKey();

// Load an RSA private key from an unencrypted PEM file:
// (To load from an encrypted PEM file, call LoadEncryptedPemFile instead.)

success = key.LoadPemFile("qa_data/rsa/decryptTest/priv.pem");
if (success == false) {
    Debug.WriteLine(key.LastErrorText);
    return;
}

// Make the key available to the RSA object
success = rsa.UsePrivateKey(key);
if (success == false) {
    Debug.WriteLine(rsa.LastErrorText);
    return;
}

string encryptedStr = "pP9XFJEsGgxPNHEgNiLB5H5ksCOXDk/G49BPTog1jKLAhYofV4UTH5k2TOYiqRnDnKs8+8uPoN/IxdiGXvuYG8HRzN0HtkhoZO/AxeyaB9S7eddCUlT0Pl2PEB2yQ9HG5rM7jqYOD6MAM4cuX7hqT8fa8tbzJzmBwdfFDBz94bwQjULHiO+gklIBC4vhkXT4yjuvEjxTAKU6tJeZYkBooJNdS/vE5RZRpuF6bGZU41Qc17qFR+iReBq+9f8IMmw8WR8fMbOCaygOfFS1nw7JVsIMGsAIXS8rUaJ/2DfGPfQx5HCiVtTOreGYRUI3esAQjnvUCnavZyQgs53nl7e2aA==";

rsa.EncodingMode = "base64";

bool usePrivateKey = true;
string decryptedStr = rsa.DecryptStringENC(encryptedStr,usePrivateKey);

Debug.WriteLine("Decrypted:");
Debug.WriteLine(decryptedStr);