Java Utililty Methods Checksum Calculate

List of utility methods to do Checksum Calculate

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Description

The list of methods to do Checksum Calculate are organized into topic(s).

Method

booleanchecksum(String nmea)
checksum 
int len = nmea.length();
if (len < 3)
    return false;
try {
    String checksumString = nmea.substring(len - 2, len);
    int target = Integer.valueOf(checksumString, 16);
    int chk = computeChecksum(nmea);
    if (chk == target)
...
intchecksum_icmpv6(byte pkt[])
checksuicmpv 
return checksum_icmpv6(pkt, 0);
StringchecksumBytesToString(byte[] digestBytes)
Converts a message digest byte array into a String based on the hex values appearing in the array. 
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < digestBytes.length; i++) {
    String hex = Integer.toHexString(0xff & digestBytes[i]);
    if (hex.length() == 1) {
        hexString.append('0');
    hexString.append(hex);
return hexString.toString();
longchecksumFile(File file)
checksum File 
return checksum(new FileInputStream(file));
intchecksumLength(int algorithmCode, int dataLength)
checksum Length 
if (algorithmCode == NO_CHECKSUM) {
    return 0;
} else {
    return (int) Math.ceil((double) dataLength / CHECK_CHUNK_SIZE) * 8;
StringcreateChecksum(File file, String shaAlgo)
create Checksum 
try {
    InputStream fis = new FileInputStream(file);
    byte[] buffer = new byte[1024];
    MessageDigest complete = MessageDigest.getInstance(shaAlgo);
    int numRead;
    do {
        numRead = fis.read(buffer);
        if (numRead > 0) {
...
StringgenerateChecksum(InputStream is)
generate Checksum 
return generateChecksum(is, DEFAULT_ALGORITHM);
StringgenerateChecksum(String path, String flavor)
Creates a checksum for a file by first reading in its byte and passing those bytes through a formula that allows each chunk of bytes to be read as an integer and then made into a String 
final byte[] digest = makeChecksum(path, flavor);
String output = "";
for (int i = 0; i < digest.length; i++) {
    int current = (digest[i] & 0xff) + 0x100;
    output += Integer.toString(current, 16).substring(1);
return output;
StringgenerateChecksum(String pType, String pInFile)
Generates a checksum for a file 
if (!new File(pInFile).exists())
    throw new IOException("File not found: " + pInFile);
MessageDigest md;
try {
    md = MessageDigest.getInstance(pType.toUpperCase());
} catch (NoSuchAlgorithmException e) {
    return null;
FileInputStream input;
try {
    input = new FileInputStream(pInFile);
    byte[] readBuffer = new byte[BUFSIZE];
    int bytesRead = 0;
    while (input.available() > 0) {
        bytesRead = input.read(readBuffer);
        md.update(readBuffer, 0, bytesRead);
    input.close();
} catch (FileNotFoundException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
String hash = "";
for (byte b : md.digest())
    hash += String.format("%02x", b);
return hash;
StringgenerateCheckSum(String string)
This method generates a checksum from a passed string 
try {
    MessageDigest md = MessageDigest.getInstance("MD5");
    md.update(string.getBytes());
    byte byteData[] = md.digest();
    StringBuilder hexString = new StringBuilder();
    for (byte aByteData : byteData) {
        String hex = Integer.toHexString(0xff & aByteData);
        if (hex.length() == 1)
...