Convert MD5 array to String java

Question

I know that there is a lot of similar topics, but still... can someone provide me a working example of method which generates MD5 String.
I\'m currently using MessageDig

Answer 1

// Convert to hex string
StringBuffer sb = new StringBuffer();
for (int i = 0; i < messageDigest.length; i++) {
    if ((0xff & messageDigest[i]) < 0x10) {
        sb.append('0');
    }
    sb.append(Integer.toHexString(0xff & messageDigest[i]));
}
String md5 = sb.toString();

This assumes you actually want your MD5 printed as an hex string, not BASE64-encoded. That's the way it is normally represented.

Answer 2

I'd use commons-codec

• Base64 - Base64.encodeBase64(digestBytes)
• Hex-string - Hex.encodeHex(digestBytes)

Answer 3

import javax.xml.bind.DatatypeConverter;
import java.security.MessageDigest;

...
String input = "westerngun";
MessageDigest digest = MessageDigest.getInstance("MD5"); // not thread-safe, create instance for each thread
byte[] result = digest.digest(input.getBytes()); // get MD5 hash array, could contain negative
String hex = DatatypeConverter.printHexBinary(result).toLowerCase(); // convert byte array to hex string

If you want a number:

Integer number = Integer.parseInt(hex, 16); // parse hex number to integer. If overflowed, use Long.parseLong()

Answer 4

I've seen next solution:

    byte[] digest = md.digest(someDataByteArray);
    StringBuilder hex = new StringBuilder();
    for (byte b : digest) {
        hex.append(String.format("%02x", b));
    }

Answer 5

MessageDigest md = MessageDigest.getInstance("MD5");
byte[] arr = md.digest(bytesOfMessage);
return Base64.getEncoder().encodeToString(arr);

note: md5 is not considered as good hash algorithm anymore, consider choosing SHAs