Visual FoxPro

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()));
}

Visual FoxPro

LOCAL lnSuccess
LOCAL lcPrivateKey
LOCAL lcPublicKey
LOCAL lcPlainText
LOCAL loCrypt
LOCAL lcHmacHex
LOCAL loSbSignatureHash
LOCAL lcAuthorization

lnSuccess = 0

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

* This is clearly in base64 encoding.
lcPrivateKey = "qwfvUeVRWAwyjlAzGivefFPTg+m6QtBPmDVv7Ra/u7K3UuVVRhrZ/qc8EPh8IGJatuxsWD4EX+D9qE/eVvLTpw=="

* This is clearly in the hex encoding.
lcPublicKey = "16baedbe244b6c063968850716afb319a"

lcPlainText = "POST" + CHR(10) + "1456765639015" + CHR(10) + "/api/v5/policy/1234567890" + CHR(10)

loCrypt = CreateObject('Chilkat.Crypt2')

* We want HMAC-SHA1.
loCrypt.MacAlgorithm = "HMAC"
loCrypt.HashAlgorithm = "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.)
loCrypt.SetMacKeyEncoded(lcPrivateKey,"us-ascii")

* We want our HMAC-SHA1 output to be a hex string.
loCrypt.EncodingMode = "hex_lower"

lcHmacHex = loCrypt.MacStringENC(lcPlainText)

? lcHmacHex

* The expected result is: dd3e8440f6b550f152156ea5e12d3e20b262adae

loSbSignatureHash = CreateObject('Chilkat.StringBuilder')
loSbSignatureHash.Append(lcPublicKey)
loSbSignatureHash.Append(":")
loSbSignatureHash.Append(lcHmacHex)

lcAuthorization = loSbSignatureHash.GetEncoded("base64","utf-8")
? "Authorization: " + lcAuthorization

* The expected result is:  MTZiYWVkYmUyNDRiNmMwNjM5Njg4NTA3MTZhZmIzMTlhOmRkM2U4NDQwZjZiNTUwZjE1MjE1NmVhNWUxMmQzZTIwYjI2MmFkYWU=

RELEASE loCrypt
RELEASE loSbSignatureHash