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(Unicode C) Encrypt with Chilkat, Decrypt with OpenSSLDemonstrates how to RSA encrypt a string using Chilkat, and then shows the corresponding OpenSSL command to RSA decrypt. The OpenSSL command to decrypt is as follows: openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt
#include <C_CkRsaW.h> #include <C_CkPublicKeyW.h> #include <C_CkByteData.h> #include <C_CkFileAccessW.h> void ChilkatSample(void) { HCkRsaW rsa; HCkPublicKeyW key; BOOL success; const wchar_t *strToEncrypt; BOOL usePrivateKey; HCkByteData encryptedBytes; HCkFileAccessW fac; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. rsa = CkRsaW_Create(); // Note: RSA encryption uses the public key. // RSA decryption uses the private key. // The reason is that the public key can be freely provided to anybody. This allows anybody // to send an encrypted message to the private key owner, and only the private key owner // can decrypt. key = CkPublicKeyW_Create(); // Load an RSA public key from a PEM file: success = CkPublicKeyW_LoadFromFile(key,L"qa_data/pem/VP_Public.pem"); if (success != TRUE) { wprintf(L"%s\n",CkPublicKeyW_lastErrorText(key)); CkRsaW_Dispose(rsa); CkPublicKeyW_Dispose(key); return; } // Load the public key into the RSA object. success = CkRsaW_ImportPublicKeyObj(rsa,key); if (success != TRUE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkRsaW_Dispose(rsa); CkPublicKeyW_Dispose(key); return; } strToEncrypt = L"00000000;XYZ2-3BHQ-ABCD-MMVV;6MY1-GHJK-9LRR;0"; // The LittleEndian property is FALSE by default, but it is set here // anyway to show that LittleEndian byte ordering is required for OpenSSL compatibility. CkRsaW_putLittleEndian(rsa,FALSE); usePrivateKey = FALSE; encryptedBytes = CkByteData_Create(); success = CkRsaW_EncryptString(rsa,strToEncrypt,usePrivateKey,encryptedBytes); if (CkRsaW_getLastMethodSuccess(rsa) != TRUE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkRsaW_Dispose(rsa); CkPublicKeyW_Dispose(key); CkByteData_Dispose(encryptedBytes); return; } // The OpenSSL command to decrypt would be this: // openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt fac = CkFileAccessW_Create(); success = CkFileAccessW_WriteEntireFile(fac,L"qa_output/rsa_encrypted.bin",encryptedBytes); if (success != TRUE) { wprintf(L"%s\n",CkFileAccessW_lastErrorText(fac)); CkRsaW_Dispose(rsa); CkPublicKeyW_Dispose(key); CkByteData_Dispose(encryptedBytes); CkFileAccessW_Dispose(fac); return; } wprintf(L"RSA Encryption Succeeded.\n"); CkRsaW_Dispose(rsa); CkPublicKeyW_Dispose(key); CkByteData_Dispose(encryptedBytes); CkFileAccessW_Dispose(fac); } |
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