C

RSA Encrypt and OpenSSL Decrypt

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Demonstrates how to use Chilkat to RSA encrypt, and then use OpenSSL to decrypt. C

#include <C_CkRsa.h>
#include <C_CkPrivateKey.h>
#include <C_CkPublicKey.h>
#include <C_CkBinData.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkRsa rsa;
    HCkPrivateKey privKey;
    HCkPublicKey pubKey;
    const char *plainText;
    BOOL bUsePrivateKey;
    const char *encryptedStr;
    HCkBinData bd;

    success = FALSE;

    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    rsa = CkRsa_Create();

    privKey = CkPrivateKey_Create();
    success = CkRsa_GenKey(rsa,2048,privKey);
    success = CkPrivateKey_SavePkcs8PemFile(privKey,"qa_output/privKey.pem");

    pubKey = CkPublicKey_Create();
    CkPrivateKey_ToPublicKey(privKey,pubKey);

    CkRsa_putEncodingMode(rsa,"base64");
    plainText = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890";
    bUsePrivateKey = FALSE;
    CkRsa_UsePublicKey(rsa,pubKey);
    encryptedStr = CkRsa_encryptStringENC(rsa,plainText,bUsePrivateKey);

    bd = CkBinData_Create();
    CkBinData_AppendEncoded(bd,encryptedStr,"base64");
    success = CkBinData_WriteFile(bd,"qa_output/enc.dat");

    // The OpenSSL command to decrypt is:
    // openssl pkeyutl -in enc.dat -inkey privKey.pem -keyform PEM -pkeyopt rsa_padding_mode:pkcs1 -decrypt

    printf("OK\n");


    CkRsa_Dispose(rsa);
    CkPrivateKey_Dispose(privKey);
    CkPublicKey_Dispose(pubKey);
    CkBinData_Dispose(bd);

    }