DataFlex

Duplicate Java HMAC-SHA1 using Chilkat

See more Encryption Examples

This example uses Chilkat to produce the same results as this Java code:

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;

public void hmacSignatureExample() throws NoSuchAlgorithmException,
InvalidKeyException {

final String method = "POST";
final Long epoch = 1456765639015L; // Hardcoding for this example
final String uri = "/api/v5/policy/1234567890";
final String newline = "\n";

final String privateKey = "qwfvUeVRWAwyjlAzGivefFPTg+m6QtBPmDVv7Ra
/u7K3UuVVRhrZ/qc8EPh8IGJatuxsWD4EX+D9qE/eVvLTpw==";
final String publicKey = "16baedbe244b6c063968850716afb319a";

// Prepare the signature
final String plainText = method + newline + epoch + newline + uri + newline;

// Hash the plaintext with the private key
final byte[] keyBytes = privateKey.getBytes();
final Key key = new SecretKeySpec(keyBytes, 0, keyBytes.length, "HmacSHA1");
final Mac mac = Mac.getInstance("HmacSHA1");
mac.init(key);
String signatureHash = new String(Hex.encodeHex(mac.doFinal(plainText.
getBytes())));

// Prefix with public key
signatureHash = publicKey + ":" + signatureHash;

// Base64 encode to produce AUTHORIZATION
final String authorization = new String(Base64.encodeBase64(signatureHash.
getBytes()));
}

DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    String sPrivateKey
    String sPublicKey
    String sPlainText
    Handle hoCrypt
    String sHmacHex
    Handle hoSbSignatureHash
    String sAuthorization

    Move False To iSuccess

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

    // This is clearly in base64 encoding.
    Move "qwfvUeVRWAwyjlAzGivefFPTg+m6QtBPmDVv7Ra/u7K3UuVVRhrZ/qc8EPh8IGJatuxsWD4EX+D9qE/eVvLTpw==" To sPrivateKey

    // This is clearly in the hex encoding.
    Move "16baedbe244b6c063968850716afb319a" To sPublicKey

    Move "POST" + (character(10)) + "1456765639015" + (character(10)) + "/api/v5/policy/1234567890" + (character(10)) To sPlainText

    Get Create (RefClass(cComChilkatCrypt2)) To hoCrypt
    If (Not(IsComObjectCreated(hoCrypt))) Begin
        Send CreateComObject of hoCrypt
    End

    // We want HMAC-SHA1.
    Set ComMacAlgorithm Of hoCrypt To "HMAC"
    Set ComHashAlgorithm Of hoCrypt To "SHA1"

    // The Java code (above) is literally using the us-ascii chars of the base64 string as the HMAC key.
    // (It is NOT using the base64 decoded bytes.)
    Get ComSetMacKeyEncoded Of hoCrypt sPrivateKey "us-ascii" To iSuccess

    // We want our HMAC-SHA1 output to be a hex string.
    Set ComEncodingMode Of hoCrypt To "hex_lower"

    Get ComMacStringENC Of hoCrypt sPlainText To sHmacHex

    Showln sHmacHex

    // The expected result is: dd3e8440f6b550f152156ea5e12d3e20b262adae

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbSignatureHash
    If (Not(IsComObjectCreated(hoSbSignatureHash))) Begin
        Send CreateComObject of hoSbSignatureHash
    End
    Get ComAppend Of hoSbSignatureHash sPublicKey To iSuccess
    Get ComAppend Of hoSbSignatureHash ":" To iSuccess
    Get ComAppend Of hoSbSignatureHash sHmacHex To iSuccess

    Get ComGetEncoded Of hoSbSignatureHash "base64" "utf-8" To sAuthorization
    Showln "Authorization: " sAuthorization

    // The expected result is:  MTZiYWVkYmUyNDRiNmMwNjM5Njg4NTA3MTZhZmIzMTlhOmRkM2U4NDQwZjZiNTUwZjE1MjE1NmVhNWUxMmQzZTIwYjI2MmFkYWU=


End_Procedure