(DataFlex) Encrypt with Chilkat, Decrypt with OpenSSL

Demonstrates 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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoRsa
    Variant vKey
    Handle hoKey
    Boolean iSuccess
    String sStrToEncrypt
    Boolean iUsePrivateKey
    Variant hoEncryptedBytes
    Handle hoFac
    String sTemp1
    Boolean bTemp1

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

    Get Create (RefClass(cComChilkatRsa)) To hoRsa
    If (Not(IsComObjectCreated(hoRsa))) Begin
        Send CreateComObject of hoRsa
    End

    // 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.
    Get Create (RefClass(cComChilkatPublicKey)) To hoKey
    If (Not(IsComObjectCreated(hoKey))) Begin
        Send CreateComObject of hoKey
    End

    // Load an RSA public key from a PEM file:
    Get ComLoadFromFile Of hoKey "qa_data/pem/VP_Public.pem" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Load the public key into the RSA object.
    Get pvComObject of hoKey to vKey
    Get ComImportPublicKeyObj Of hoRsa vKey To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRsa To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Move "00000000;XYZ2-3BHQ-ABCD-MMVV;6MY1-GHJK-9LRR;0" To sStrToEncrypt

    // The LittleEndian property is False by default, but it is set here
    // anyway to show that LittleEndian byte ordering is required for OpenSSL compatibility.
    Set ComLittleEndian Of hoRsa To False

    Move False To iUsePrivateKey

    Get ComEncryptString Of hoRsa sStrToEncrypt iUsePrivateKey To hoEncryptedBytes
    Get ComLastMethodSuccess Of hoRsa To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoRsa To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // The OpenSSL command to decrypt would be this:
    // openssl rsautl -decrypt -inkey VP_Private.pem -in rsa_encrypted.bin -out original.txt

    Get Create (RefClass(cComCkFileAccess)) To hoFac
    If (Not(IsComObjectCreated(hoFac))) Begin
        Send CreateComObject of hoFac
    End
    Get ComWriteEntireFile Of hoFac "qa_output/rsa_encrypted.bin" vEncryptedBytes To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoFac To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "RSA Encryption Succeeded."


End_Procedure