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(Java) Duplicate openssl dgst -sha256 -sign private.pem -out sha256.sig in.datDemonstrates how to duplicate this OpenSSL command: openssl dgst -sha256 -sign private.pem -out sha256.sig in.datThe in.dat file can contain text or binary data of any type. The OpenSSL command does the following:
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. boolean success; CkPrivateKey pkey = new CkPrivateKey(); // Load the private key from an PEM file: success = pkey.LoadPemFile("private.pem"); if (success != true) { System.out.println(pkey.lastErrorText()); return; } // Load the file to be signed. CkByteData inData = new CkByteData(); success = inData.loadFile("in.dat"); if (success != true) { System.out.println("Failed to load input data."); return; } CkRsa rsa = new CkRsa(); // Import the private key into the RSA component: success = rsa.ImportPrivateKeyObj(pkey); if (success != true) { System.out.println(rsa.lastErrorText()); return; } // OpenSSL uses big-endian... rsa.put_LittleEndian(false); CkByteData sigData = new CkByteData(); success = rsa.SignBytes(inData,"sha256",sigData); if (success != true) { System.out.println(rsa.lastErrorText()); return; } // Save the binary signature to a file. success = sigData.saveFile("signature.sig"); if (success != true) { System.out.println("Failed to save signature file."); return; } System.out.println("Success."); } } |
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