[bouncy castle] HMAC-MD5, HMAC-SHA1 example

HMAC MD5 Example

public byte[] hmacMd5(byte[] key, byte[] text) {
    HMac mac = new HMac(new MD5Digest());
    mac.init(new KeyParameter(key));
    int macSize = mac.getMacSize();
    byte[] output = new byte[macSize];
    mac.update(text, 0, text.length);
    mac.doFinal(output, 0);
    return output;
}

public void hmac_md5_rfc_2202_test_001_01() {
    //test_case =     1
    //key =           0x0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b
    //key_len =       16
    //data =          "Hi There"
    //data_len =      8
    //digest =        0x9294727a3638bb1c13f48ef8158bfc9d

    byte[] key = {
        (byte)0x0b, (byte)0x0b, (byte)0x0b, (byte)0x0b, (byte)0x0b, (byte)0x0b, (byte)0x0b, (byte)0x0b,
        (byte)0x0b, (byte)0x0b, (byte)0x0b, (byte)0x0b, (byte)0x0b, (byte)0x0b, (byte)0x0b, (byte)0x0b
    };
    byte[] msg = "Hi There".getBytes(StandardCharsets.UTF_8);

    Mac mac = new Mac();
    byte[] ret = mac.hmacMd5(key, msg);

    assertEquals("9294727A3638BB1C13F48EF8158BFC9D", toHex(ret));
}

 

HMAC SHA1 Example

public byte[] hmacSha1(byte[] key, byte[] text) {
    HMac mac = new HMac(new SHA1Digest());
    mac.init(new KeyParameter(key));
    int macSize = mac.getMacSize();
    byte[] output = new byte[macSize];
    mac.update(text, 0, text.length);
    mac.doFinal(output, 0);
    return output;
}

@Test
public void hmac_sha1_rfc_2202_test_008() {
    //test_case =     2
    //key =           "Jefe"
    //key_len =       4
    //data =          "what do ya want for nothing?"
    //data_len =      28
    //digest =        0xeffcdf6ae5eb2fa2d27416d5f184df9c259a7c79
    byte[] key = "Jefe".getBytes(StandardCharsets.UTF_8);
    byte[] msg = "what do ya want for nothing?".getBytes(StandardCharsets.UTF_8);

    Mac mac = new Mac();
    byte[] ret = mac.hmacSha1(key, msg);
    assertEquals("EFFCDF6AE5EB2FA2D27416D5F184DF9C259A7C79", toHex(ret));
}

 

 

RFC 2202에 HMAC-MD5, HMAC-SHA1에 대한 Testcase들을 제공하고 있다.

 

 

참고자료 및 소스 코드

https://www.ietf.org/rfc/rfc2202.txt

https://github.com/coolbong/BouncyCastleExample/blob/master/src/main/java/io/github/coolbong/Mac.java