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Hmac Class — netty Architecture

Architecture documentation for the Hmac class in Hmac.java from the netty codebase.

Class java

Entity Profile

Dependency Diagram

graph TD
  5bd1a483_27e1_6efa_e106_4fe3575fc3d0["Hmac"]
  493807f5_0be9_72a3_4b85_c03ae2dcde60["Hmac.java"]
  5bd1a483_27e1_6efa_e106_4fe3575fc3d0 -->|defined in| 493807f5_0be9_72a3_4b85_c03ae2dcde60
  0e4028c4_7d23_dcc3_8dc6_9ec7bd865208["Mac()"]
  5bd1a483_27e1_6efa_e106_4fe3575fc3d0 -->|method| 0e4028c4_7d23_dcc3_8dc6_9ec7bd865208
  320196ae_8dba_0a87_2a0a_7f800a5a7eb5["ByteBuffer()"]
  5bd1a483_27e1_6efa_e106_4fe3575fc3d0 -->|method| 320196ae_8dba_0a87_2a0a_7f800a5a7eb5
  193e525f_51f1_be2b_4c9a_609ea0a1f452["Hmac()"]
  5bd1a483_27e1_6efa_e106_4fe3575fc3d0 -->|method| 193e525f_51f1_be2b_4c9a_609ea0a1f452

Relationship Graph

Source Code

codec-classes-quic/src/main/java/io/netty/handler/codec/quic/Hmac.java lines 28–67

final class Hmac {

    private static final FastThreadLocal<Mac> MACS = new FastThreadLocal<Mac>() {
        @Override
        protected Mac initialValue() {
            return newMac();
        }
    };

    private static final String ALGORITM = "HmacSHA256";
    private static final byte[] randomKey = new byte[16];

    static {
        new SecureRandom().nextBytes(randomKey);
    }

    private static Mac newMac() {
        try {
            SecretKeySpec keySpec = new SecretKeySpec(randomKey, ALGORITM);
            Mac mac = Mac.getInstance(ALGORITM);
            mac.init(keySpec);
            return mac;
        } catch (NoSuchAlgorithmException | InvalidKeyException exception) {
            throw new IllegalStateException(exception);
        }
    }

    static ByteBuffer sign(ByteBuffer input, int outLength) {
        Mac mac = MACS.get();
        mac.reset();
        mac.update(input);
        byte[] signBytes = mac.doFinal();
        if (signBytes.length != outLength) {
            signBytes = Arrays.copyOf(signBytes, outLength);
        }
        return ByteBuffer.wrap(signBytes);
    }

    private Hmac() { }
}

Defined In

Source

Frequently Asked Questions

What is the Hmac class?
Hmac is a class in the netty codebase, defined in codec-classes-quic/src/main/java/io/netty/handler/codec/quic/Hmac.java.
Where is Hmac defined?
Hmac is defined in codec-classes-quic/src/main/java/io/netty/handler/codec/quic/Hmac.java at line 28.

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