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(Unicode C) Duplicate Java Verify RSA SignatureDemonstrates how to duplicate a snippet of Java code that verifies an RSA signature.
#include <C_CkCertW.h> #include <C_CkRsaW.h> void ChilkatSample(void) { const wchar_t *base64DataToBeSigned; const wchar_t *base64Certificate; const wchar_t *base64Signature; HCkCertW cert; BOOL success; HCkRsaW rsa; // This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // This example duplicates the following Java code: // import com.sun.org.apache.xml.internal.security.utils.Base64; // import java.io.ByteArrayInputStream; // import java.security.PublicKey; // import java.security.Signature; // import java.security.cert.CertificateFactory; // import java.security.cert.X509Certificate; // public class validateSazetak { // public static void main(String[] args) { // String signatureAlgorithm = "SHA256withRSA"; // String base64DataToBeSigned = "Hlp...LE4="; // String base64Certificate = "MII...TlQ=="; // String base64Signature = "I00...pZA=="; // try { // CertificateFactory cf; // X509Certificate certificate = null; // cf = CertificateFactory.getInstance("X.509"); // certificate = (X509Certificate) cf.generateCertificate(new // ByteArrayInputStream(Base64.decode(base64Certificate))); // // Signature signature = Signature.getInstance(signatureAlgorithm, "SunRsaSign"); // PublicKey pk = (PublicKey) certificate.getPublicKey(); // signature.initVerify(pk); // // byte[] hashBytes = Base64.decode(base64DataToBeSigned); // signature.update(hashBytes); // // byte[] sigBytes = Base64.decode(base64Signature); // boolean validity = signature.verify(sigBytes); // System.out.println("Is valid signature:" + validity); // } catch (Exception e) { // System.out.println(e); // } // } base64DataToBeSigned = L"Hlp...LE4="; base64Certificate = L"MII...TlQ=="; base64Signature = L"I00...pZA=="; cert = CkCertW_Create(); success = CkCertW_LoadFromBase64(cert,base64Certificate); if (success == FALSE) { wprintf(L"%s\n",CkCertW_lastErrorText(cert)); CkCertW_Dispose(cert); return; } rsa = CkRsaW_Create(); success = CkRsaW_SetX509Cert(rsa,cert,FALSE); if (success == FALSE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkCertW_Dispose(cert); CkRsaW_Dispose(rsa); return; } CkRsaW_putEncodingMode(rsa,L"base64"); success = CkRsaW_VerifyStringENC(rsa,base64DataToBeSigned,L"sha256",base64Signature); if (success == FALSE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkCertW_Dispose(cert); CkRsaW_Dispose(rsa); return; } wprintf(L"Signature verified.\n"); CkCertW_Dispose(cert); CkRsaW_Dispose(rsa); } |
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