C

Duplicate PHP RSA Encryption

See more RSA Examples

Demonstrates how to duplicate the following PHP function. C

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

void ChilkatSample(void)
    {
    BOOL success;
    const char *rsaMOD;
    const char *rsaEXP;
    HCkBinData bdMod;
    HCkBinData bdExp;
    HCkXml xml;
    HCkPublicKey pubkey;
    HCkRsa rsa;
    const char *plainText;
    const char *cipherText;

    success = FALSE;

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

    // Duplicate the following PHP code:
    // 
    //    public function encryptRSA($plainText,$rsaMOD,$pubKEY){
    //         $rsa  = new RSA();
    //         $rsa->setEncryptionMode(RSA::ENCRYPTION_PKCS1);
    //         $publicKey = [
    //             'e' => new BigInteger($pubKEY,16),
    //             'n' => new BigInteger($rsaMOD,16)
    //         ];
    // 		
    //         $rsa->loadKey($publicKey);
    //         $ciphertext = $rsa->encrypt($plainText);
    //         return bin2hex($ciphertext);
    //     }
    // 
    //     $plainText="key=abcdefghijkmnopq&iv=abcdefghijkmnopq&h=12345678&s=12345678"
    //     $rsaMOD="F0946D8F05604809E24B8CFFD30349CEA9E5F4D320BFD9E9AA1B088863F02C43E7997D37A3E27B4F8F359F1744DB6B20A437067C0D325A80660D12FF56A57673"
    //     $pubKEY="010001"

    // We have the RSA modulus in hex
    rsaMOD = "F0946D8F05604809E24B8CFFD30349CEA9E5F4D320BFD9E9AA1B088863F02C43E7997D37A3E27B4F8F359F1744DB6B20A437067C0D325A80660D12FF56A57673";

    // The RSA exponent in hex is "010001", which is 65537 in decimal.  It's typically the exponent that is always used.
    rsaEXP = "010001";

    // Get the RSA modulus and exponent in base64.
    bdMod = CkBinData_Create();
    bdExp = CkBinData_Create();
    success = CkBinData_AppendEncoded(bdMod,rsaMOD,"hex");
    success = CkBinData_AppendEncoded(bdExp,rsaEXP,"hex");

    // Build the XML representation of the RSA public key
    xml = CkXml_Create();
    CkXml_putTag(xml,"RSAPublicKey");
    CkXml_UpdateChildContent(xml,"Modulus",CkBinData_getEncoded(bdMod,"base64"));
    CkXml_UpdateChildContent(xml,"Exponent",CkBinData_getEncoded(bdExp,"base64"));

    // Load the RSA public key into a Chilkat public key object.
    pubkey = CkPublicKey_Create();
    success = CkPublicKey_LoadFromString(pubkey,CkXml_getXml(xml));

    // Setup the RSA object for encryption and do it..
    rsa = CkRsa_Create();
    CkRsa_putVerboseLogging(rsa,TRUE);
    success = CkRsa_UsePublicKey(rsa,pubkey);

    // Use PKCSv1.5 padding
    CkRsa_putPkcsPadding(rsa,TRUE);

    // Encrypt and return the string as hex.
    CkRsa_putEncodingMode(rsa,"hex");
    plainText = "key=abcdefghijkmnopq&iv=abcdefghijkmnopq&h=12345678&s=12345678";
    cipherText = CkRsa_encryptStringENC(rsa,plainText,FALSE);
    if (CkRsa_getLastMethodSuccess(rsa) == FALSE) {
        printf("%s\n",CkRsa_lastErrorText(rsa));
        CkBinData_Dispose(bdMod);
        CkBinData_Dispose(bdExp);
        CkXml_Dispose(xml);
        CkPublicKey_Dispose(pubkey);
        CkRsa_Dispose(rsa);
        return;
    }

    // Note: The PKCSv1_5 padding incorporates random bytes.  Therefore, the RSA encryption will produce different results each time -- all of which are valid 
    // and decrypt correctly to the same original text.
    printf("%s\n",cipherText);


    CkBinData_Dispose(bdMod);
    CkBinData_Dispose(bdExp);
    CkXml_Dispose(xml);
    CkPublicKey_Dispose(pubkey);
    CkRsa_Dispose(rsa);

    }