https://github.com/evertonsavio/cryptography-cmac-hmac

Java cryptography with CMACs (Cipher-based message authentication codes) & HMAC (Keyed-Hash Message Authentication Code)
https://github.com/evertonsavio/cryptography-cmac-hmac

Last synced: 12 months ago
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Java cryptography with CMACs (Cipher-based message authentication codes) & HMAC (Keyed-Hash Message Authentication Code)

• Host: GitHub
• URL: https://github.com/evertonsavio/cryptography-cmac-hmac
• Owner: evertonsavio
• Created: 2021-03-17T20:06:39.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2021-09-08T11:55:53.000Z (almost 5 years ago)
• Last Synced: 2025-02-22T01:43:25.465Z (over 1 year ago)
• Language: Java
• Homepage:
• Size: 81.1 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

          
HMAC // CMAC - JAVA & Golang

---

### References  

* https://stackoverflow.com/questions/60670117/cmac-aes-rfc-4493-calculation-in-java

* https://web.fe.up.pt/~ee96100/projecto/Tabela%20ascii.htm  

* https://stackoverflow.com/questions/6933039/convert-two-ascii-hexadecimal-characters-two-ascii-bytes-in-one-byte

* https://mkyong.com/java/how-do-convert-byte-array-to-string-in-java/  

* https://stackoverflow.com/questions/2817752/java-code-to-convert-byte-to-hexadecimal  

* https://www.netjstech.com/2016/09/converting-string-to-bytearray-java.html  

* https://www.loratools.nl/#/hex

```

    @Test

    void contextLoads() {

        byte a = (byte) 0b10010110;

        System.out.println("A byte representation is: " +  a);

        int i = 150;

        byte b = (byte) i; //0b11111101;

        System.out.println("Decimal representation: " + b);

        System.out.println("Decimal unsigned representation: " + Byte.toUnsignedInt(b));

        System.out.println("HEX OF 150: " + Integer.toHexString(150 & 0xFF));

        System.out.println("HEX OF -106: " + Integer.toHexString(-106 & 0xFF));

        System.out.println("-----------------------------------------");

        String hex = "FF";

        short i1 = Short.parseShort(hex.substring(0, 2), 16);

        System.out.println(i1);

        byte myByte = (byte) i1;

        System.out.println(myByte);

        System.out.println(Integer.toHexString(myByte & 0xFF));

        byte b2 = -1;

        byte b3 = (byte) 0b11111111;

        int s = 255;

        byte b4 = (byte) s;

        System.out.println(Byte.toUnsignedInt(b4));

        System.out.println("b3: " + b3);

        System.out.println(Integer.toHexString(b2 & 0xFF));

        String hexCode = String.format("%02x", Byte.parseByte(String.valueOf(b2)));

        System.out.println(hexCode);

    }

```