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(Unicode C) Duplicate openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -ADemonstrates how to duplicate the creation of an RSA signature produced by this OpenSSL command: openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A Note: This example requires Chilkat v11.0.0 or greater.
#include <C_CkPrivateKeyW.h> #include <C_CkRsaW.h> void ChilkatSample(void) { BOOL success; HCkPrivateKeyW pkey; HCkRsaW rsa; const wchar_t *strData; const wchar_t *base64Sig; success = FALSE; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. pkey = CkPrivateKeyW_Create(); // Load the private key from an RSA PEM file: success = CkPrivateKeyW_LoadPemFile(pkey,L"myKey.pem"); rsa = CkRsaW_Create(); // Import the private key into the RSA component: success = CkRsaW_UsePrivateKey(rsa,pkey); if (success == FALSE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkPrivateKeyW_Dispose(pkey); CkRsaW_Dispose(rsa); return; } // OpenSSL uses BigEndian byte ordering: CkRsaW_putLittleEndian(rsa,FALSE); // The resulting signature will be a Base64 string: CkRsaW_putEncodingMode(rsa,L"base64"); // For simplicity, we're not loading // the data to be signed from a file. We are instead simply // using a literal string value. strData = L"This is the text to be signed."; // Hash the input using MD5, and then sign the hash: // Other valid hash algorithm choices are "md2" and "sha-1". base64Sig = CkRsaW_signStringENC(rsa,strData,L"md5"); wprintf(L"%s\n",base64Sig); wprintf(L"Success!\n"); CkPrivateKeyW_Dispose(pkey); CkRsaW_Dispose(rsa); } |
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