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POHMAC-SHA1 in JAVA
 

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  1. POHMAC-SHA1 in JAVA
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    <p>I'm trying to create an code in Java to get the HMAC-SHA1 of an message with an key, and the result must match with the following openssl command line in UBUNTU: <em>openssl dgst -sha1 -hmac key-in-hex filename.fil</em></p> <p>I have the following code in Java:</p> <pre><code>private static MessageDigest md; private static byte[] XorKeyIpad, XorKeyOpad; private static final byte ipad = 0x36; private static final byte opad = 0x5c; private static final byte maxsize = 64; public static void HMAC_SHA1(String msg, String keyString) throws NoSuchAlgorithmException, UnsupportedEncodingException { int i; String keyHex = toHex(keyString); byte[] keyByte = keyHex.getBytes(); md = MessageDigest.getInstance("SHA-1"); //Verify if the Key have the right size; if (keyByte.length &gt; maxsize) { keyByte = md.digest(keyByte); md.reset(); } System.out.println("KeyByte: " + keyByte + " Length: " + keyByte.length); //XOR between Key and ipad; XorKeyIpad = new byte[maxsize]; for (i = 0; i &lt; keyByte.length; i++) { XorKeyIpad[i] = (byte) (keyByte[i] ^ ipad); } System.out.println("XorKeyIpad: " + XorKeyIpad + " Ipad: " + ipad); md.update(XorKeyIpad); XorKeyIpad = md.digest(XorKeyIpad); //Concat the XOR between Key and ipad with the message; String concatXorKIM = concatByteString(XorKeyIpad, msg); //SHA1 of the concat the XOR between Key and ipad with the message(which i call X); md.update(concatXorKIM.getBytes()); byte[] hashConcatXorKIM = md.digest(); md.reset(); //XOR between Key and opad(which i call Y); XorKeyOpad = new byte[maxsize]; for (i = 0; i &lt; keyByte.length; i++) { XorKeyOpad[i] = (byte) (keyByte[i] ^ opad); } //Concat between X and Y; byte[] concatHashXorKI_XorKO = concatByteByte(hashConcatXorKIM, XorKeyOpad); //SHA1 of the variable concatHashXorKI_XorKO md.update(concatHashXorKI_XorKO); byte[] hmac = md.digest(); md.reset(); } public static String toHex(String arg) throws UnsupportedEncodingException { return String.format("%040x", new BigInteger(1, arg.getBytes("UTF-8"))); } public static String concatByteString(final byte[] bytes, final String str) { final StringBuilder sb = new StringBuilder(); for (byte b : bytes) { sb.append(b); } sb.append(str); return sb.toString(); } public static byte[] concatByteByte(final byte[] byteOne, final byte[] byteTwo) { byte[] concatBytes = new byte[byteOne.length + byteTwo.length]; System.arraycopy(byteOne, 0, concatBytes, 0, byteOne.length); System.arraycopy(byteTwo, 0, concatBytes, byteOne.length, byteTwo.length); return concatBytes; } final protected static char[] hexArray = "0123456789ABCDEF".toCharArray(); public static String bytesToHex(byte[] bytes) { char[] hexChars = new char[bytes.length * 2]; int v; for (int j = 0; j &lt; bytes.length; j++) { v = bytes[j] &amp; 0xFF; hexChars[j * 2] = hexArray[v &gt;&gt;&gt; 4]; hexChars[j * 2 + 1] = hexArray[v &amp; 0x0F]; } return new String(hexChars); }` </code></pre> <p>The two results are different which means i'm doing something wrong.</p> <p>Can someone help me?</p> <p>Thanks in advance.</p>
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    1. USDiogo Miguel
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    1. COWhy do you code it by yourself? The java security API already supports HMAC-SHA1: http://stackoverflow.com/questions/10859526/hmac-sha1-signature-in-java
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    2. COBecause this is school work, and my teacher wants it's in this way.
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      1. USDiogo Miguel
 

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