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(Unicode C) RSA Sign String using Private Key of Certificate Type A3 (smart card / token)Demonstrates RSA signing a string using the private key of a certificate type A3 (smart card, token). Note: This is a Windows-only example.
#include <C_CkCertStoreW.h> #include <C_CkCertW.h> #include <C_CkRsaW.h> void ChilkatSample(void) { HCkCertStoreW certStore; const wchar_t *thumbprint; BOOL bReadOnly; BOOL success; HCkCertW cert; HCkRsaW rsa; BOOL bUsePrivateKey; const wchar_t *sigBase64; // First get the A3 certificate that was installed on the Windows system. certStore = CkCertStoreW_Create(); thumbprint = L"12c1dd8015f3f03f7b1fa619dc24e2493ca8b4b2"; // This is specific to Windows because it is opening the Windows Current-User certificate store. bReadOnly = TRUE; success = CkCertStoreW_OpenCurrentUserStore(certStore,bReadOnly); if (success != TRUE) { wprintf(L"%s\n",CkCertStoreW_lastErrorText(certStore)); CkCertStoreW_Dispose(certStore); return; } // Find the certificate with the desired thumbprint // (There are many ways to locate a certificate. This example chooses to find by thumbprint.) cert = CkCertStoreW_FindCertBySha1Thumbprint(certStore,thumbprint); if (CkCertStoreW_getLastMethodSuccess(certStore) != TRUE) { wprintf(L"Failed to find the certificate.\n"); CkCertStoreW_Dispose(certStore); return; } wprintf(L"Found: %s\n",CkCertW_subjectCN(cert)); rsa = CkRsaW_Create(); // Provide the cert's private key bUsePrivateKey = TRUE; success = CkRsaW_SetX509Cert(rsa,cert,bUsePrivateKey); CkCertW_Dispose(cert); if (success != TRUE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkCertStoreW_Dispose(certStore); CkRsaW_Dispose(rsa); return; } // Return the RSA signature in base64 encoded form. CkRsaW_putEncodingMode(rsa,L"base64"); // Sign the utf-8 byte representation of the string. CkRsaW_putCharset(rsa,L"utf-8"); // You can also choose other hash algorithms, such as SHA-1. sigBase64 = CkRsaW_signStringENC(rsa,L"text to sign",L"SHA-256"); if (CkRsaW_getLastMethodSuccess(rsa) != TRUE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkCertStoreW_Dispose(certStore); CkRsaW_Dispose(rsa); return; } wprintf(L"Base64 signature: %s\n",sigBase64); CkCertStoreW_Dispose(certStore); CkRsaW_Dispose(rsa); } |
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