DataFlex

Get an EC Key in Raw Hex Format

See more ECC Examples

Demonstrates how to get the private and public key parts of an EC (ECDSA) key in lowercase hex formmat.

Note: This example requires Chilkat v9.5.0.83 or greater.

DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoPrivKey
    Variant vSbPubKeyHex
    Handle hoSbPubKeyHex
    String sPrivKeyHex
    String sTemp1
    Integer iTemp1

    Move False To iSuccess

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

    // Load an EC key from some format..
    Get Create (RefClass(cComChilkatPrivateKey)) To hoPrivKey
    If (Not(IsComObjectCreated(hoPrivKey))) Begin
        Send CreateComObject of hoPrivKey
    End

    // This loads an ECDSA key from an unencrypted PEM file (no password required).
    Get ComLoadAnyFormatFile Of hoPrivKey "qa_data/ecc/openssl_ecc_privKey.pem" "" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPrivKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // The key type should be "ecc" to indicate an EC key.
    Get ComKeyType Of hoPrivKey To sTemp1
    Showln "key type = " sTemp1

    // What is the size of the private key in bits?
    Get ComBitLength Of hoPrivKey To iTemp1
    Showln "size in bits = " iTemp1

    // Get the private and public EC key parts in raw hex format:
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbPubKeyHex
    If (Not(IsComObjectCreated(hoSbPubKeyHex))) Begin
        Send CreateComObject of hoSbPubKeyHex
    End
    Get pvComObject of hoSbPubKeyHex to vSbPubKeyHex
    Get ComGetRawHex Of hoPrivKey vSbPubKeyHex To sPrivKeyHex

    // If the private key size in bits is 256, then we should have a 32-byte key (a 64 character hex string).
    Showln "private key = " sPrivKeyHex

    // The public key is composed of the "x" and "y" parts, and is composed like this:  04||HEX(x)||HEX(y)
    Get ComGetAsString Of hoSbPubKeyHex To sTemp1
    Showln "public key = " sTemp1

    // Sample output:
    // key type = ecc
    // size in bits = 256
    // private key = ced36f2ba3332be439f79143d69937fc52494cd38e45243c3ea05db183919f1b
    // public key = 045b4edcd501831740895f5907feabb71587076a6314d9d5141f9f8c33a478b8ce08b8dfd2a091eb6355803d7e729876c790bc0b176f2015f3bb103813753f676a


End_Procedure