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(Unicode C) RSA Sign an Encoded HashSee more RSA ExamplesDemonstrates signing a hash (e.g., SHA256) provided as an encoded string (e.g., base64 or hex).
#include <C_CkCertW.h> #include <C_CkBinDataW.h> #include <C_CkRsaW.h> void ChilkatSample(void) { HCkCertW cert; BOOL success; HCkBinDataW bd; int i; HCkRsaW rsa; const wchar_t *sha256_base64; const wchar_t *rsaSig_base64; // Assuming the smartcard/USB token is installed with the correct drivers from the manufacturer, // this code can work on multiple platforms including Windows, MacOS, Linux, and iOS. // Chilkat automatically detects and determines the way in which the HSM is used, // which can be by PKCS11, Apple Keychain, Microsoft CNG / Crypto API, or ScMinidriver. cert = CkCertW_Create(); // Set the token/smartcard PIN prior to loading. CkCertW_putSmartCardPin(cert,L"123456"); // Specify the certificate by its common name. success = CkCertW_LoadFromSmartcard(cert,L"cn=chilkat-rsa-2048"); if (success == FALSE) { wprintf(L"%s\n",CkCertW_lastErrorText(cert)); CkCertW_Dispose(cert); return; } wprintf(L"Signing with the private key for this cert: %s\n",CkCertW_subjectCN(cert)); // Create data to be hashed and signed. bd = CkBinDataW_Create(); for (i = 0; i <= 100; i++) { CkBinDataW_AppendEncoded(bd,L"000102030405060708090A0B0C0D0E0F",L"hex"); } rsa = CkRsaW_Create(); // Use the certificate's private key for signing. success = CkRsaW_SetX509Cert(rsa,cert,TRUE); if (success == FALSE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkCertW_Dispose(cert); CkBinDataW_Dispose(bd); CkRsaW_Dispose(rsa); return; } // We'll first compute the hash and then pass the encoded hash to be signed. sha256_base64 = CkBinDataW_getHash(bd,L"sha256",L"base64"); wprintf(L"sha256 hash in base64 format: %s\n",sha256_base64); // Pass in the base64 hash and return a base64 signature. CkRsaW_putEncodingMode(rsa,L"base64"); rsaSig_base64 = CkRsaW_signHashENC(rsa,sha256_base64,L"sha256"); if (success == FALSE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkCertW_Dispose(cert); CkBinDataW_Dispose(bd); CkRsaW_Dispose(rsa); return; } wprintf(L"RSA signature as base64: %s\n",rsaSig_base64); CkCertW_Dispose(cert); CkBinDataW_Dispose(bd); CkRsaW_Dispose(rsa); } |
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