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Generate RSA Key and Sign a StringDemonstrates how to generate a new RSA public/private key pair and use it to generate a signature for a string. The (binary) digital signature is returned as a hexidecimalized string.
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[]) { CkRsa rsa = new CkRsa(); // Any string argument automatically begins the 30-day trial. boolean success; success = rsa.UnlockComponent("30-day trial"); if (success != true) { System.out.println("RSA component unlock failed"); return; } // Generate a 1024-bit RSA key pair. rsa.GenerateKey(1024); // This example will sign a string, and receive the signature // in a hex-encoded string. Therefore, set the encoding mode // to "hex": rsa.put_EncodingMode("hex"); // If some other non-Chilkat application or web service is going to be verifying // the signature, it is important to match the byte-ordering. // The LittleEndian property may be set to true // for little-endian byte ordering, // or false for big-endian byte ordering. // Microsoft apps typically use little-endian, while // OpenSSL and other services (such as Amazon CloudFront) // use big-endian. rsa.put_LittleEndian(false); String strData; strData = "This is the string to be signed."; // Sign the string using the md5 hash algorithm. // Other valid choices are "md2", "sha256", "sha384", // "sha512", and "sha-1". String hexSig; hexSig = rsa.signStringENC(strData,"md5"); System.out.println(hexSig); System.out.println(rsa.lastErrorText()); // Now verify the signature: success = rsa.VerifyStringENC(strData,"md5",hexSig); if (success == true) { System.out.println("Signature verified!"); } else { System.out.println(rsa.lastErrorText()); } // Try it with an invalid signature: success = rsa.VerifyStringENC(strData,"md5","not a valid sig"); if (success == true) { System.out.println("Signature verified!"); } else { System.out.println(rsa.lastErrorText()); } // Try it with invalid data: success = rsa.VerifyStringENC("Not the original data","md5",hexSig); if (success == true) { System.out.println("Signature verified!"); } else { System.out.println(rsa.lastErrorText()); } // Try it with the wrong hash algorithm: success = rsa.VerifyStringENC(strData,"sha-1",hexSig); if (success == true) { System.out.println("Signature verified!"); } else { System.out.println(rsa.lastErrorText()); } } } |
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