}
        }
        return cipher;
    }

    protected Cipher pollEncryptoCipher(final Key key) {
        Cipher cipher = encryptoQueue.poll();
        if (cipher == null) {
            try {
                cipher = Cipher.getInstance(transformation);
                cipher.init(Cipher.ENCRYPT_MODE, key);
            } catch (final InvalidKeyException e) {

---

<a name="tlsv13_only"></a>
#### ¹ TLSv1.3 Only

Cipher suites that are only available with TLSv1.3.

<a name="http2_naughty"></a>
#### ² HTTP/2 Cipher Suite Denylist

Cipher suites that are [discouraged for use][http2_denylist] with HTTP/2. OkHttp includes them because better suites are not commonly available. For example, none of the better cipher suites listed above shipped with Android 4.4 or Java 7.

        return new HMACT64(key);
    }


    /**
     * 
     * @param key
     * @return RC4 cipher
     */
    public static Cipher getArcfour ( byte[] key ) {
        try {
            Cipher c = Cipher.getInstance("RC4");
            c.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, "RC4"));
            return c;
        }
        catch (
            NoSuchAlgorithmException |

        byte[] keybytes = key.getEncoded();
        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(keybytes, "AES"), new IvParameterSpec(ZERO_IV, 0, ZERO_IV.length));
        if ( constant.length != cipher.getBlockSize() ) {
            constant = expandNFold(constant, cipher.getBlockSize());
        }
        byte[] enc = constant;

        final PrimaryCipher cipher = ComponentUtil.getPrimaryCipher();
        ParameterUtil.parse(value).entrySet().stream().map(e -> {
            final String k = e.getKey();
            final String v = e.getValue();
            if (properyPattern.matcher(k).matches() && !v.startsWith(CIPHER_PREFIX)) {
                return new Pair<>(k, CIPHER_PREFIX + cipher.encrypt(v));
            }

const Enabled = enabled

// DARECiphers returns a list of supported cipher suites
// for the DARE object encryption.
func DARECiphers() []byte {
	if Enabled {
		return []byte{sio.AES_256_GCM}
	}
	return []byte{sio.AES_256_GCM, sio.CHACHA20_POLY1305}
}

// TLSCiphers returns a list of supported TLS transport
// cipher suite IDs.
//
// The list contains only ciphers that use AES-GCM or

  public CustomCipherSuites() throws GeneralSecurityException {
    // Configure cipher suites to demonstrate how to customize which cipher suites will be used for
    // an OkHttp request. In order to be selected a cipher suite must be included in both OkHttp's
    // connection spec and in the SSLSocket's enabled cipher suites array. Most applications should
    // not customize the cipher suites list.
    List<CipherSuite> customCipherSuites = asList(

import okhttp3.FallbackTestClientSocketFactory.Companion.TLS_FALLBACK_SCSV

/**
 * An SSLSocketFactory that delegates calls. Sockets created by the delegate are wrapped with ones
 * that will not accept the [TLS_FALLBACK_SCSV] cipher, thus bypassing server-side fallback
 * checks on platforms that support it. Unfortunately this wrapping will disable any
 * reflection-based calls to SSLSocket from Platform.
 */
class FallbackTestClientSocketFactory(

        SMBUtil.writeInt2(this.ciphers != null ? this.ciphers.length : 0, dst, dstIndex);
        dstIndex += 2;

        if ( this.ciphers != null ) {
            for ( int cipher : this.ciphers ) {
                SMBUtil.writeInt2(cipher, dst, dstIndex);
                dstIndex += 2;
            }
        }
        return dstIndex - start;
    }


    /**
     * {@inheritDoc}
     *

	iv, nonce := random[:16], random[16:]

	var aead cipher.AEAD
	switch keyType {
	case kms.AES256:
		mac := hmac.New(sha256.New, s.key)
		mac.Write(iv)
		sealingKey := mac.Sum(nil)

		block, err := aes.NewCipher(sealingKey)
		if err != nil {
			return nil, err
		}
		aead, err = cipher.NewGCM(block)
		if err != nil {
			return nil, err
		}
	case kms.ChaCha20: