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(DataFlex) Get Ed25519 Key in Different Formats

Demonstrates how to get/save an Ed25519 private key to different formats.

Converting a private key from one format to another is done by loading in one format and saving/getting in another.

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

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoEddsa
    Variant vPrng
    Handle hoPrng
    Variant vPrivKey
    Handle hoPrivKey
    Boolean iSuccess
    String sPkcs1Base64
    String sPkcs8Base64
    String sPassword
    String sPkcs8EncBase64
    String sEd25519Pem
    String sJwk
    Handle hoJson
    String sEd25519_xml
    Variant vSbPubKeyHex
    Handle hoSbPubKeyHex
    String sPrivKeyHex
    String sTemp1

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

    Get Create (RefClass(cComChilkatEdDSA)) To hoEddsa
    If (Not(IsComObjectCreated(hoEddsa))) Begin
        Send CreateComObject of hoEddsa
    End
    Get Create (RefClass(cComChilkatPrng)) To hoPrng
    If (Not(IsComObjectCreated(hoPrng))) Begin
        Send CreateComObject of hoPrng
    End
    Get Create (RefClass(cComChilkatPrivateKey)) To hoPrivKey
    If (Not(IsComObjectCreated(hoPrivKey))) Begin
        Send CreateComObject of hoPrivKey
    End

    // Generates a new ed25519 key and stores it in privKey.
    Get pvComObject of hoPrng to vPrng
    Get pvComObject of hoPrivKey to vPrivKey
    Get ComGenEd25519Key Of hoEddsa vPrng vPrivKey To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoEddsa To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // ----------------------------------------------------------
    // Ed25519 PKCS1 format
    // 
    // This is the format created by:  openssl genpkey -algorithm X25519 -out xkey.pem
    Get ComGetPkcs1ENC Of hoPrivKey "base64" To sPkcs1Base64
    Showln sPkcs1Base64

    // Sample output:  MC4CAQAwBQYDK2VuBCIEIB1mwirs+eC6XGbkjPIiZyBwQ7768uSd9v5PHOLFbIXo

    // PKCS1 is a binary ASN.1 DER format.  You can examine the contents with two online tools:
    // 1) Go to ASN.1 Decoder  and paste the base64 into the online form.
    // 2) Or Decode Base64 ASN.1 to XML 

    // The PKCS1 ASN.1 format for an Ed25519 key look like this:
    //   SEQUENCE
    //     INTEGER 0
    //     SEQUENCE
    //       OBJECT IDENTIFIER 1.3.101.110 curveX25519 (ECDH 25519 key agreement algorithm)
    //     OCTET STRING 
    //       OCTET STRING (32 byte) 1D66C...

    // Save it directly to a file.
    Get ComSavePkcs1File Of hoPrivKey "qa_output/ed25519.key" To iSuccess

    // ----------------------------------------------------------
    // Ed25519 Unencrypted PKCS8 format
    // 
    // For ed25519, the ASN.1 output is the same as for PKCS1.
    Get ComGetPkcs8ENC Of hoPrivKey "base64" To sPkcs8Base64
    Showln sPkcs8Base64

    // PKCS8 is a binary ASN.1 DER format.  You can examine the contents with two online tools:
    // 1) Go to ASN.1 Decoder  and paste the base64 into the online form.
    // 2) Or Decode Base64 ASN.1 to XML 

    // ----------------------------------------------------------
    // Ed25519 Encrypted PKCS8 format
    // 
    // Note: The encrypted output cannot be examined using the above online tools because the ASN.1 is encrypted.
    Move "secret" To sPassword
    Get ComGetPkcs8EncryptedENC Of hoPrivKey "base64" sPassword To sPkcs8EncBase64
    Showln sPkcs8EncBase64

    // ----------------------------------------------------------
    // Ed25519 in PEM format:
    // 
    Get ComGetPkcs1Pem Of hoPrivKey To sEd25519Pem
    Showln sEd25519Pem

    // Sample output:

    // -----BEGIN PRIVATE KEY-----
    // MC4CAQAwBQYDK2VuBCIEIOKPhbULJagBAi7hbRdn1f4AAzh1RqqCHqCAvau7N6yO
    // -----END PRIVATE KEY-----

    // ----------------------------------------------------------
    // Ed25519 in JWK Format
    // 
    Get ComGetJwk Of hoPrivKey To sJwk

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComLoad Of hoJson sJwk To iSuccess
    Set ComEmitCompact Of hoJson To False
    Get ComEmit Of hoJson To sTemp1
    Showln sTemp1

    // Sample output:
    // {
    //   "kty": "OKP",
    //   "crv": "Ed25519",
    //   "x": "SE2Kne5xt51z1eciMH2T2ftDQp96Gl6FhY6zSQujiP0",
    //   "d": "O-eRXewadF0sNyB0U9omcnt8Qg2ZmeK3WSXPYgqe570",
    //   "use": "sig"
    // }

    // In the above JWK, x is the public key, y is the private key.
    // Both are 32 bytes and are base64-url encoded.

    // ----------------------------------------------------------
    // Ed25519 in XML Format
    // 
    Get ComGetXml Of hoPrivKey To sEd25519_xml
    Showln sEd25519_xml

    // Sample output:  <Ed25519KeyValue>w4b/gI0zgYKgjtfWLjNfc4issmP7Qap84uesYNgEefP/WoY3jNOhOzgTYsMtOnuyGn3MdA4NZtsUXVNI1NiTlA==</Ed25519KeyValue>

    // The base64 content is composed of the concatenation of the 32-byte private key with the 32-byte public key and then base64 encoded.
    // In other words:  Base64(privKey || pubKey)

    // ----------------------------------------------------------
    // Ed25519 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

    // We should have a 32-byte private key (a 64 character hex string).
    Showln "private key = " sPrivKeyHex

    // We should have a 32-byte public key (a 64 character hex string).
    Get ComGetAsString Of hoSbPubKeyHex To sTemp1
    Showln "public key = " sTemp1

    // Sample output:
    // key type = ed25519
    // size in bits = 256
    // private key = d4ee72dbf913584ad5b6d8f1f769f8ad3afe7c28cbf1d4fbe097a88f44755842
    // public key = 19bf44096984cdfe8541bac167dc3b96c85086aa30b6b6cb0c5c38ad703166e1


End_Procedure

 

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