From 970aa9060a3c1c022dfe04cfeb199a6b790b7635 Mon Sep 17 00:00:00 2001 From: tzefferer Date: Tue, 16 Nov 2010 17:28:33 +0000 Subject: git-svn-id: https://joinup.ec.europa.eu/svn/mocca/trunk@837 8a26b1a7-26f0-462f-b9ef-d0e30c41f5a4 --- .../main/java/at/gv/egiz/smcc/DNIeCryptoUtil.java | 336 +++++++++++++++++++++ 1 file changed, 336 insertions(+) create mode 100644 smcc/src/main/java/at/gv/egiz/smcc/DNIeCryptoUtil.java (limited to 'smcc/src/main/java/at/gv/egiz/smcc/DNIeCryptoUtil.java') diff --git a/smcc/src/main/java/at/gv/egiz/smcc/DNIeCryptoUtil.java b/smcc/src/main/java/at/gv/egiz/smcc/DNIeCryptoUtil.java new file mode 100644 index 00000000..0f6cef59 --- /dev/null +++ b/smcc/src/main/java/at/gv/egiz/smcc/DNIeCryptoUtil.java @@ -0,0 +1,336 @@ +package at.gv.egiz.smcc; + +import java.io.ByteArrayInputStream; +import java.io.InputStream; +import java.math.BigInteger; +import java.security.InvalidAlgorithmParameterException; +import java.security.InvalidKeyException; +import java.security.Key; +import java.security.KeyFactory; +import java.security.MessageDigest; +import java.security.NoSuchAlgorithmException; +import java.security.NoSuchProviderException; +import java.security.cert.CertificateFactory; +import java.security.cert.X509Certificate; +import java.security.interfaces.RSAPrivateKey; +import java.security.interfaces.RSAPublicKey; +import java.security.spec.KeySpec; +import java.security.spec.RSAPrivateKeySpec; +import java.security.spec.RSAPublicKeySpec; +import java.util.Arrays; +import java.util.Random; + +import javax.crypto.BadPaddingException; +import javax.crypto.Cipher; +import javax.crypto.IllegalBlockSizeException; +import javax.crypto.NoSuchPaddingException; +import javax.crypto.ShortBufferException; +import javax.crypto.spec.IvParameterSpec; +import javax.crypto.spec.SecretKeySpec; +import javax.smartcardio.CardException; + +public class DNIeCryptoUtil { + + private final static byte[] IV = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00 }; + + public static X509Certificate createCertificate(byte[] certData) + throws CardException { + + try { + InputStream inStream = new ByteArrayInputStream(certData); + CertificateFactory cf = CertificateFactory.getInstance("X.509"); + X509Certificate certificate = (X509Certificate) cf + .generateCertificate(inStream); + inStream.close(); + + return certificate; + + } catch (Exception e) { + + throw new CardException("Unable to create certificate.", e); + } + } + + public static RSAPrivateKey createRSAPrivateKey(String mod, + String privExponent) throws CardException { + + BigInteger modulus = new BigInteger(mod, 16); + BigInteger privExp = new BigInteger(privExponent, 16); + + KeyFactory fac; + RSAPrivateKey key; + try { + fac = KeyFactory.getInstance("RSA"); + KeySpec spec = new RSAPrivateKeySpec(modulus, privExp); + key = (RSAPrivateKey) fac.generatePrivate(spec); + } catch (Exception e) { + + throw new CardException("Unable to create private key.", e); + } + + return key; + } + + public static RSAPublicKey createRSAPublicKey(String mod, String pubExponent) + throws CardException { + + BigInteger modulus = new BigInteger(mod, 16); + BigInteger pubExp = new BigInteger(pubExponent, 16); + + KeyFactory fac; + RSAPublicKey key; + try { + fac = KeyFactory.getInstance("RSA"); + KeySpec spec = new RSAPublicKeySpec(modulus, pubExp); + key = (RSAPublicKey) fac.generatePublic(spec); + } catch (Exception e) { + + throw new CardException("Unable to create public key.", e); + } + + return key; + } + + public static byte[] getRandomBytes(int length) { + + byte[] result = new byte[length]; + + for (int i = 0; i < length; i++) { + + Random rand = new Random(); + byte current = (byte) rand.nextInt(255); + result[i] = current; + } + + return result; + } + + public static byte[] computeSHA1Hash(byte[] data) throws CardException { + + try { + MessageDigest sha = MessageDigest.getInstance("SHA"); + + sha.update(data); + return sha.digest(); + + } catch (NoSuchAlgorithmException e) { + throw new CardException("Error computing SHA1 hash.", e); + } + + } + + public static byte[] rsaEncrypt(Key key, byte[] data) + throws NoSuchAlgorithmException, NoSuchPaddingException, + InvalidKeyException, IllegalBlockSizeException, BadPaddingException { + + Cipher rsa = Cipher.getInstance("RSA/ECB/NoPadding"); + rsa.init(Cipher.ENCRYPT_MODE, key); + byte[] encrypted = rsa.doFinal(data); + + return encrypted; + + } + + public static byte[] rsaDecrypt(Key key, byte[] cipher) + throws NoSuchAlgorithmException, NoSuchPaddingException, + InvalidKeyException, IllegalBlockSizeException, BadPaddingException { + + Cipher rsa = Cipher.getInstance("RSA/ECB/NoPadding"); + rsa.init(Cipher.DECRYPT_MODE, key); + byte[] decrypted = rsa.doFinal(cipher); + + return decrypted; + } + + public static byte[] applyPadding(int blockSize, byte[] data) { + + // add mandatory 0x80 + byte[] extended = new byte[data.length + 1]; + System.arraycopy(data, 0, extended, 0, data.length); + extended[extended.length - 1] = (byte) 0x80; + + if (extended.length % blockSize == 0) { + + return extended; + } + + int requiredBlocks = ((int) (extended.length / blockSize) + 1); + + byte[] result = new byte[requiredBlocks * blockSize]; + Arrays.fill(result, (byte) 0x00); + System.arraycopy(extended, 0, result, 0, extended.length); + + return result; + + } + + public static byte[] removePadding(byte[] paddedData) throws CardException { + + for (int i = paddedData.length - 1; i >= 0; i--) { + + byte current = paddedData[i]; + + if (current == (byte) 0x00) { + + continue; + } + + if (current == (byte) 0x80) { + + // end of padding reached + byte[] data = new byte[i]; + System.arraycopy(paddedData, 0, data, 0, i); + return data; + + } else { + + throw new CardException("Wrong padding."); + } + } + + throw new CardException( + "Error removing padding from data. Unexpected data format."); + + } + + public static byte[] calculateAPDUMAC(byte[] data, byte[] key, byte[] ssc, + int blockLength) throws CardException { + + SecretKeySpec desSingleKey = new SecretKeySpec(key, 0, blockLength, + "DES"); + Cipher singleDesCipher; + try { + singleDesCipher = Cipher.getInstance("DES/CBC/NoPadding"); + } catch (Exception e) { + + throw new CardException("Error creating DES cipher instance.", e); + } + + // Calculate the first n - 1 block. + IvParameterSpec ivSpec; + ivSpec = new IvParameterSpec(IV); + int dataLen = data.length; + + try { + singleDesCipher.init(Cipher.ENCRYPT_MODE, desSingleKey, ivSpec); + } catch (Exception e) { + throw new CardException("Error initializing DES cipher.", e); + } + byte[] result; + try { + result = singleDesCipher.doFinal(ssc); + } catch (Exception e) { + throw new CardException("Error applying DES cipher.", e); + } + + byte[] dataBlock = new byte[blockLength]; + + for (int i = 0; i < dataLen - blockLength; i = i + blockLength) { + + System.arraycopy(data, i, dataBlock, 0, blockLength); + byte[] input = xorByteArrays(result, dataBlock); + + try { + result = singleDesCipher.doFinal(input); + } catch (Exception e) { + throw new CardException("Error applying DES cipher.", e); + } + } + + // calculate the last block with 3DES + byte[] fullKey = new byte[24]; + System.arraycopy(key, 0, fullKey, 0, 16); + System.arraycopy(key, 0, fullKey, 16, 8); + + SecretKeySpec desKey = new SecretKeySpec(fullKey, "DESede"); + Cipher cipher; + try { + cipher = Cipher.getInstance("DESede/CBC/NoPadding"); + } catch (Exception e) { + throw new CardException("Error getting 3DES cipher instance.", e); + } + + ivSpec = new IvParameterSpec(IV); + try { + cipher.init(Cipher.ENCRYPT_MODE, desKey, ivSpec); + } catch (Exception e) { + throw new CardException("Error initializing 3DES cipher.", e); + } + + System.arraycopy(data, data.length - blockLength, dataBlock, 0, + blockLength); + byte[] input = xorByteArrays(result, dataBlock); + + byte[] mac = new byte[4]; + + try { + + result = cipher.doFinal(input); + + } catch (Exception e) { + throw new CardException("Error applying 3DES cipher.", e); + } + + System.arraycopy(result, 0, mac, 0, 4); + return mac; + } + + public static byte[] xorByteArrays(byte[] array1, byte[] array2) + throws CardException { + + if (array1 == null || array2 == null || array1.length != array2.length) { + + throw new CardException("Cannot xor byte arrays - invalid input."); + } + + byte[] result = new byte[array1.length]; + + for (int i = 0; i < array1.length; i++) { + + result[i] = (byte) (array1[i] ^ array2[i]); + } + + return result; + } + + public static byte[] perform3DESCipherOperation(byte[] data, + byte[] keyData, int mode) throws NoSuchAlgorithmException, + NoSuchProviderException, NoSuchPaddingException, + InvalidKeyException, InvalidAlgorithmParameterException, + ShortBufferException, IllegalBlockSizeException, + BadPaddingException { + + byte[] full3DESKey = new byte[24]; + System.arraycopy(keyData, 0, full3DESKey, 0, 16); + System.arraycopy(keyData, 0, full3DESKey, 16, 8); + + SecretKeySpec key = new SecretKeySpec(full3DESKey, "DESede"); + IvParameterSpec ivSpec = new IvParameterSpec(IV); + + Cipher cipher = Cipher.getInstance("DESede/CBC/NoPadding"); + + cipher.init(mode, key, ivSpec); + byte[] cipherText = new byte[cipher.getOutputSize(data.length)]; + int ctLength = cipher.update(data, 0, data.length, cipherText, 0); + ctLength += cipher.doFinal(cipherText, ctLength); + return cipherText; + + } + + public static int getCutOffLength(byte[] data, int blockSize) + throws CardException { + + int len = data.length % blockSize; + + // verify + if (data[len - 1] == (byte) 0x01) { + + return len; + } else { + throw new CardException( + "Unable to reconstruct encrypted datablock."); + } + + } +} -- cgit v1.2.3