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(Unicode C) RSA Sign Binary Data and Verify (Recover the Original Data)Demonstrates how to RSA sign binary data and then verify/recover the original data. Note: This example uses methods introduced in Chilkat v9.5.0.77.
#include <C_CkPrivateKeyW.h> #include <C_CkRsaW.h> #include <C_CkBinDataW.h> #include <C_CkPublicKeyW.h> void ChilkatSample(void) { HCkPrivateKeyW privKey; BOOL success; HCkRsaW rsa; const wchar_t *originalData; HCkBinDataW bd; HCkPublicKeyW pubKey; HCkRsaW rsa2; BOOL bVerified; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Load an RSA private key for signing. privKey = CkPrivateKeyW_Create(); success = CkPrivateKeyW_LoadEncryptedPemFile(privKey,L"qa_data/pem/rsa_passwd.pem",L"passwd"); if (success != TRUE) { wprintf(L"%s\n",CkPrivateKeyW_lastErrorText(privKey)); CkPrivateKeyW_Dispose(privKey); return; } rsa = CkRsaW_Create(); CkRsaW_ImportPrivateKeyObj(rsa,privKey); // We have some binary data (in hex) to sign originalData = L"0102030405060708090A"; bd = CkBinDataW_Create(); CkBinDataW_AppendEncoded(bd,originalData,L"hex"); // If successful, the contents of bd are replaced with the RSA signature. success = CkRsaW_OpenSslSignBd(rsa,bd); if (success != TRUE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkPrivateKeyW_Dispose(privKey); CkRsaW_Dispose(rsa); CkBinDataW_Dispose(bd); return; } // Show the RSA signature in base64 wprintf(L"%s\n",CkBinDataW_getEncoded(bd,L"base64")); // ------------------------------------------ // Get the public key from the private key pubKey = CkPrivateKeyW_GetPublicKey(privKey); // Verify the signature and extract the original data. rsa2 = CkRsaW_Create(); CkRsaW_ImportPublicKeyObj(rsa2,pubKey); bVerified = CkRsaW_OpenSslVerifyBd(rsa2,bd); wprintf(L"signature verified: %d\n",bVerified); // Show the original data: wprintf(L"original data: %s\n",CkBinDataW_getEncoded(bd,L"hex")); CkPublicKeyW_Dispose(pubKey); CkPrivateKeyW_Dispose(privKey); CkRsaW_Dispose(rsa); CkBinDataW_Dispose(bd); CkRsaW_Dispose(rsa2); } |
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