In this Java Program it uses some hash to encrypt
In this File, I need help to translate some of this content
is there an equivalent for MessageDigester in C#?Code:private static Logger log = LoggerFactory.getLogger(LoginCryptoLegacy.class);
/**
* Map of 6 bit nibbles to base64 characters.
*/
private static char[] iota64 = new char[64];
static {
int i = 0;
iota64[i++] = '.';
iota64[i++] = '/';
for (char c = 'A'; c <= 'Z'; c++) {
iota64[i++] = c;
}
for (char c = 'a'; c <= 'z'; c++) {
iota64[i++] = c;
}
for (char c = '0'; c <= '9'; c++) {
iota64[i++] = c;
}
}
/**
* Class Constructor. Static class, so it's a dummy constructor.
*/
private LoginCryptoLegacy() {
}
/**
* Hash the password for first time storage.
*
* @param password The password to be hashed.
* @return String of the hashed password.
*/
public static String hashPassword(String password) {
byte[] randomBytes = new byte[6];
java.util.Random randomGenerator = new java.util.Random();
randomGenerator.nextBytes(randomBytes);
return myCrypt(password, genSalt(randomBytes));
}
/**
* Check a password against a hash.
*
* @param password The password to validate.
* @param hash The hash to validate against.
* @return <code>true</code> if the password is correct, <code>false</code> otherwise.
*/
public static boolean checkPassword(String password, String hash) {
return (myCrypt(password, hash).equals(hash));
}
public static boolean isLegacyPassword(String hash) {
return hash.substring(0, 3).equals("$H$");
}
/**
* Encrypt a string with <code>Seed</code> as a seed code.
*
* @param password Password to encrypt.
* @param seed Seed to use.
* @return The salted SHA1 hash of password.
* @throws RuntimeException
*/
private static String myCrypt(String password, String seed) throws RuntimeException {
String out = null;
int count = 8;
MessageDigest digester;
// Check for correct Seed
if (!seed.substring(0, 3).equals("$H$")) {
// Oh noes! Generate a seed and continue.
byte[] randomBytes = new byte[6];
java.util.Random randomGenerator = new java.util.Random();
randomGenerator.nextBytes(randomBytes);
seed = genSalt(randomBytes);
}
String salt = seed.substring(4, 12);
if (salt.length() != 8) {
throw new RuntimeException("Error hashing password - Invalid seed.");
}
byte[] sha1Hash = new byte[40];
try {
digester = MessageDigest.getInstance("SHA-1");
digester.update((salt + password).getBytes("iso-8859-1"), 0, (salt + password).length());
sha1Hash = digester.digest();
do {
byte[] CombinedBytes = new byte[sha1Hash.length + password.length()];
System.arraycopy(sha1Hash, 0, CombinedBytes, 0, sha1Hash.length);
System.arraycopy(password.getBytes("iso-8859-1"), 0, CombinedBytes, sha1Hash.length, password.getBytes("iso-8859-1").length);
digester.update(CombinedBytes, 0, CombinedBytes.length);
sha1Hash = digester.digest();
} while (--count > 0);
out = seed.substring(0, 12);
out += encode64(sha1Hash);
} catch (NoSuchAlgorithmException Ex) {
log.error("Error hashing password.", Ex);
} catch (UnsupportedEncodingException Ex) {
log.error("Error hashing password.", Ex);
}
if (out == null) {
throw new RuntimeException("Error hashing password - out = null");
}
return out;
}
/**
* Generates a salt string from random bytes <code>Random</code>
*
* @param Random Random bytes to get salt from.
* @return Salt string.
*/
private static String genSalt(byte[] Random) {
String Salt = "$H$";
Salt += iota64[30];
Salt += encode64(Random);
return Salt;
}
/**
* Encodes a byte array into base64.
*
* @param Input Array of bytes to put into base64.
* @return String of base64.
*/
private static String encode64(byte[] Input) {
int iLen = Input.length;
int oDataLen = (iLen * 4 + 2) / 3; // output length without padding
int oLen = ((iLen + 2) / 3) * 4; // output length including
// padding
char[] out = new char[oLen];
int ip = 0;
int op = 0;
while (ip < iLen) {
int i0 = Input[ip++] & 0xff;
int i1 = ip < iLen ? Input[ip++] & 0xff : 0;
int i2 = ip < iLen ? Input[ip++] & 0xff : 0;
int o0 = i0 >>> 2;
int o1 = ((i0 & 3) << 4) | (i1 >>> 4);
int o2 = ((i1 & 0xf) << 2) | (i2 >>> 6);
int o3 = i2 & 0x3F;
out[op++] = iota64[o0];
out[op++] = iota64[o1];
out[op] = op < oDataLen ? iota64[o2] : '=';
op++;
out[op] = op < oDataLen ? iota64[o3] : '=';
op++;
}
return new String(out);
}
}
and those exceptions?
Thanks for any response
