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bytesToHex function is changed #1230

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Merged
yanglbme merged 1 commit into from
Mar 15, 2020
Merged

bytesToHex function is changed #1230

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19 changes: 15 additions & 4 deletions ciphers/AESEncryption.java
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,6 @@
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.xml.bind.DatatypeConverter;

/**
* This example program shows how AES encryption and decryption can be done in
Expand All @@ -19,6 +18,8 @@
*/
public class AESEncryption {


private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();
/**
* 1. Generate a plain text for encryption 2. Get a secret key (printed in
* hexadecimal form). In actual use this must by encrypted and kept safe. The
Expand Down Expand Up @@ -103,12 +104,22 @@ public static String decryptText(byte[] byteCipherText, SecretKey secKey) throws

/**
* Convert a binary byte array into readable hex form
*
* Old library is deprecated on OpenJdk 11 and
* this is faster regarding other solution is using StringBuilder
* Credit
* {@link
* https://stackoverflow.com/questions/9655181/how-to-convert-a-byte-array-to-a-hex-string-in-java/9855338#9855338}
* @param hash
* (in binary)
* @return hexHash
*/
private static String bytesToHex(byte[] hash) {
return DatatypeConverter.printHexBinary(hash);
public static String bytesToHex(byte[] bytes) {
char[] hexChars = new char[bytes.length * 2];
for (int j = 0; j < bytes.length; j++) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = HEX_ARRAY[v >>> 4];
hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
}
return new String(hexChars);
}
}