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(Java) Encrypt with Chilkat, Decrypt with OpenSSLDemonstrates how to RSA encrypt a string using Chilkat, and then shows the corresponding OpenSSL command to RSA decrypt. The OpenSSL command to decrypt is as follows: openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt
import com.chilkatsoft.*; public class ChilkatExample { static { try { System.loadLibrary("chilkat"); } catch (UnsatisfiedLinkError e) { System.err.println("Native code library failed to load.\n" + e); System.exit(1); } } public static void main(String argv[]) { // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkRsa rsa = new CkRsa(); // Note: RSA encryption uses the public key. // RSA decryption uses the private key. // The reason is that the public key can be freely provided to anybody. This allows anybody // to send an encrypted message to the private key owner, and only the private key owner // can decrypt. CkPublicKey key = new CkPublicKey(); // Load an RSA public key from a PEM file: boolean success = key.LoadFromFile("qa_data/pem/VP_Public.pem"); if (success != true) { System.out.println(key.lastErrorText()); return; } // Load the public key into the RSA object. success = rsa.ImportPublicKeyObj(key); if (success != true) { System.out.println(rsa.lastErrorText()); return; } String strToEncrypt = "00000000;XYZ2-3BHQ-ABCD-MMVV;6MY1-GHJK-9LRR;0"; // The LittleEndian property is false by default, but it is set here // anyway to show that LittleEndian byte ordering is required for OpenSSL compatibility. rsa.put_LittleEndian(false); boolean usePrivateKey = false; CkByteData encryptedBytes = new CkByteData(); success = rsa.EncryptString(strToEncrypt,usePrivateKey,encryptedBytes); if (rsa.get_LastMethodSuccess() != true) { System.out.println(rsa.lastErrorText()); return; } // The OpenSSL command to decrypt would be this: // openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt CkFileAccess fac = new CkFileAccess(); success = fac.WriteEntireFile("qa_output/rsa_encrypted.bin",encryptedBytes); if (success != true) { System.out.println(fac.lastErrorText()); return; } System.out.println("RSA Encryption Succeeded."); } } |
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