Package net.minecraft.network.encryption

Class NetworkEncryptionUtils

java.lang.Object

net.minecraft.network.encryption.NetworkEncryptionUtils

public class NetworkEncryptionUtils
extends Object

Utilities for encryption, decryption, signing, and hashing of data.

API Note:

Methods in this class usually throw NetworkEncryptionException when the operation fails. This is a checked exception and thus must be caught when using the methods.

Mappings:

Namespace	Name
official	aqw
intermediary	net/minecraft/class_3515
named	net/minecraft/network/encryption/NetworkEncryptionUtils

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static interface	NetworkEncryptionUtils.KeyDecoder<T extends Key>	A functional interface that decodes an encoded key.
static class	NetworkEncryptionUtils.SecureRandomUtil	Utilities for working with a secure random number generator.
static final record	NetworkEncryptionUtils.SignatureData	A record holding a signature of a data and the salt added while signing.

Field Summary

Fields

Modifier and Type	Field	Description
private static final String	AES
private static final int	AES_KEY_LENGTH
static final Base64.Encoder	BASE64_ENCODER
private static final String	ISO_8859_1
static final String	LINEBREAK
private static final String	RSA
private static final int	RSA_KEY_LENGTH
static final com.mojang.serialization.Codec<PrivateKey>	RSA_PRIVATE_KEY_CODEC	The codec for RSA private keys.
private static final String	RSA_PRIVATE_KEY_PREFIX
private static final String	RSA_PRIVATE_KEY_SUFFIX
static final com.mojang.serialization.Codec<PublicKey>	RSA_PUBLIC_KEY_CODEC	The codec for RSA public keys.
static final String	RSA_PUBLIC_KEY_PREFIX
private static final String	RSA_PUBLIC_KEY_SUFFIX
private static final String	SHA1
static final int	SHA256_BITS
static final String	SHA256_WITH_RSA

Constructor Summary

Constructors

Constructor	Description
NetworkEncryptionUtils()

Method Summary

Modifier and Type	Method	Description
static Cipher	cipherFromKey(int opMode, Key key)	Creates an AES cipher from the key.
static byte[]	computeServerId(String baseServerId, PublicKey publicKey, SecretKey secretKey)	Returns the computed server ID.
private static Cipher	createCipher(int opMode, String algorithm, Key key)	Creates a cipher to perform encryption or decryption operation.
private static byte[]	crypt(int opMode, Key key, byte[] data)	Low-level API to perform encryption or decryption operation.
private static PrivateKey	decodeEncodedRsaPrivateKey(byte[] key)	Decodes a PCKS #8-encoded RSA private key.
static PublicKey	decodeEncodedRsaPublicKey(byte[] key)	Decodes a X.509-encoded RSA public key.
private static <T extends Key> T	decodePem(String key, String prefix, String suffix, NetworkEncryptionUtils.KeyDecoder<T> decoder)	Decodes a PEM-formatted string key.
static PrivateKey	decodeRsaPrivateKeyPem(String key)	Decodes a PEM-formatted RSA private key.
static PublicKey	decodeRsaPublicKeyPem(String key)	Decodes a PEM-formatted RSA public key.
static byte[]	decrypt(Key key, byte[] data)	Decrypts an encrypted data.
static SecretKey	decryptSecretKey(PrivateKey privateKey, byte[] encryptedSecretKey)	Decrypts RSA-encrypted AES secret key.
static String	encodeRsaPrivateKey(PrivateKey key)	Encodes an RSA private key to a PEM-formatted key string.
static String	encodeRsaPublicKey(PublicKey key)	Encodes an RSA public key to a PEM-formatted key string.
static byte[]	encrypt(Key key, byte[] data)	Encrypts a data.
static SecretKey	generateSecretKey()	Returns a new 128 bit AES secret key.
static KeyPair	generateServerKeyPair()	Returns a new 1024 bit RSA public/private key pair.
private static byte[]	hash(byte[][] bytes)	Returns the SHA-1 hash of bytes.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

AES

private static final String AES

See Also:

• Constant Field Values

Mappings:

Namespace	Name	Mixin selector
official	h	Laqw;h:Ljava/lang/String;
intermediary	field_29830	Lnet/minecraft/class_3515;field_29830:Ljava/lang/String;
named	AES	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;AES:Ljava/lang/String;

AES_KEY_LENGTH

private static final int AES_KEY_LENGTH

See Also:

• Constant Field Values

Mappings:

Namespace	Name	Mixin selector
official	i	Laqw;i:I
intermediary	field_29831	Lnet/minecraft/class_3515;field_29831:I
named	AES_KEY_LENGTH	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;AES_KEY_LENGTH:I

RSA

private static final String RSA

See Also:

• Constant Field Values

Mappings:

Namespace	Name	Mixin selector
official	j	Laqw;j:Ljava/lang/String;
intermediary	field_29832	Lnet/minecraft/class_3515;field_29832:Ljava/lang/String;
named	RSA	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;RSA:Ljava/lang/String;

RSA_KEY_LENGTH

private static final int RSA_KEY_LENGTH

See Also:

• Constant Field Values

Mappings:

Namespace	Name	Mixin selector
official	k	Laqw;k:I
intermediary	field_29833	Lnet/minecraft/class_3515;field_29833:I
named	RSA_KEY_LENGTH	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;RSA_KEY_LENGTH:I

ISO_8859_1

private static final String ISO_8859_1

See Also:

• Constant Field Values

Mappings:

Namespace	Name	Mixin selector
official	l	Laqw;l:Ljava/lang/String;
intermediary	field_29834	Lnet/minecraft/class_3515;field_29834:Ljava/lang/String;
named	ISO_8859_1	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;ISO_8859_1:Ljava/lang/String;

SHA1

private static final String SHA1

See Also:

• Constant Field Values

Mappings:

Namespace	Name	Mixin selector
official	m	Laqw;m:Ljava/lang/String;
intermediary	field_29835	Lnet/minecraft/class_3515;field_29835:Ljava/lang/String;
named	SHA1	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;SHA1:Ljava/lang/String;

SHA256_WITH_RSA

public static final String SHA256_WITH_RSA

See Also:

• Constant Field Values

Mappings:

Namespace	Name	Mixin selector
official	a	Laqw;a:Ljava/lang/String;
intermediary	field_39109	Lnet/minecraft/class_3515;field_39109:Ljava/lang/String;
named	SHA256_WITH_RSA	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;SHA256_WITH_RSA:Ljava/lang/String;

SHA256_BITS

public static final int SHA256_BITS

See Also:

• Constant Field Values

Mappings:

Namespace	Name	Mixin selector
official	b	Laqw;b:I
intermediary	field_40111	Lnet/minecraft/class_3515;field_40111:I
named	SHA256_BITS	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;SHA256_BITS:I

RSA_PRIVATE_KEY_PREFIX

private static final String RSA_PRIVATE_KEY_PREFIX

See Also:

• Constant Field Values

Mappings:

Namespace	Name	Mixin selector
official	n	Laqw;n:Ljava/lang/String;
intermediary	field_39037	Lnet/minecraft/class_3515;field_39037:Ljava/lang/String;
named	RSA_PRIVATE_KEY_PREFIX	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;RSA_PRIVATE_KEY_PREFIX:Ljava/lang/String;

RSA_PRIVATE_KEY_SUFFIX

private static final String RSA_PRIVATE_KEY_SUFFIX

See Also:

• Constant Field Values

Mappings:

Namespace	Name	Mixin selector
official	o	Laqw;o:Ljava/lang/String;
intermediary	field_39038	Lnet/minecraft/class_3515;field_39038:Ljava/lang/String;
named	RSA_PRIVATE_KEY_SUFFIX	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;RSA_PRIVATE_KEY_SUFFIX:Ljava/lang/String;

RSA_PUBLIC_KEY_PREFIX

public static final String RSA_PUBLIC_KEY_PREFIX

See Also:

• Constant Field Values

Mappings:

Namespace	Name	Mixin selector
official	c	Laqw;c:Ljava/lang/String;
intermediary	field_39033	Lnet/minecraft/class_3515;field_39033:Ljava/lang/String;
named	RSA_PUBLIC_KEY_PREFIX	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;RSA_PUBLIC_KEY_PREFIX:Ljava/lang/String;

RSA_PUBLIC_KEY_SUFFIX

private static final String RSA_PUBLIC_KEY_SUFFIX

See Also:

• Constant Field Values

Mappings:

Namespace	Name	Mixin selector
official	p	Laqw;p:Ljava/lang/String;
intermediary	field_39039	Lnet/minecraft/class_3515;field_39039:Ljava/lang/String;
named	RSA_PUBLIC_KEY_SUFFIX	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;RSA_PUBLIC_KEY_SUFFIX:Ljava/lang/String;

LINEBREAK

public static final String LINEBREAK

See Also:

• Constant Field Values

Mappings:

Namespace	Name	Mixin selector
official	d	Laqw;d:Ljava/lang/String;
intermediary	field_39034	Lnet/minecraft/class_3515;field_39034:Ljava/lang/String;
named	LINEBREAK	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;LINEBREAK:Ljava/lang/String;

BASE64_ENCODER

public static final Base64.Encoder BASE64_ENCODER

Mappings:

Namespace	Name	Mixin selector
official	e	Laqw;e:Ljava/util/Base64$Encoder;
intermediary	field_39272	Lnet/minecraft/class_3515;field_39272:Ljava/util/Base64$Encoder;
named	BASE64_ENCODER	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;BASE64_ENCODER:Ljava/util/Base64$Encoder;

RSA_PUBLIC_KEY_CODEC

public static final com.mojang.serialization.Codec<PublicKey> RSA_PUBLIC_KEY_CODEC

The codec for RSA public keys.

See Also:

• encodeRsaPublicKey(PublicKey)
• decodeRsaPublicKeyPem(String)

Implementation Note:

The key is encoded using the PEM format.

Mappings:

Namespace	Name	Mixin selector
official	f	Laqw;f:Lcom/mojang/serialization/Codec;
intermediary	field_39035	Lnet/minecraft/class_3515;field_39035:Lcom/mojang/serialization/Codec;
named	RSA_PUBLIC_KEY_CODEC	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;RSA_PUBLIC_KEY_CODEC:Lcom/mojang/serialization/Codec;

RSA_PRIVATE_KEY_CODEC

public static final com.mojang.serialization.Codec<PrivateKey> RSA_PRIVATE_KEY_CODEC

The codec for RSA private keys.

See Also:

• encodeRsaPrivateKey(PrivateKey)
• decodeRsaPrivateKeyPem(String)

Implementation Note:

The key is encoded using the PEM format.

Mappings:

Namespace	Name	Mixin selector
official	g	Laqw;g:Lcom/mojang/serialization/Codec;
intermediary	field_39036	Lnet/minecraft/class_3515;field_39036:Lcom/mojang/serialization/Codec;
named	RSA_PRIVATE_KEY_CODEC	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;RSA_PRIVATE_KEY_CODEC:Lcom/mojang/serialization/Codec;

Constructor Details

NetworkEncryptionUtils

public NetworkEncryptionUtils()

Method Details

generateSecretKey

public static SecretKey generateSecretKey()
                                   throws NetworkEncryptionException

Returns a new 128 bit AES secret key.

Returns:

a new 128 bit AES secret key

Throws:

NetworkEncryptionException - when generation fails

Mappings:

Namespace	Name	Mixin selector
official	a	Laqw;a()Ljavax/crypto/SecretKey;
intermediary	method_15239	Lnet/minecraft/class_3515;method_15239()Ljavax/crypto/SecretKey;
named	generateSecretKey	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;generateSecretKey()Ljavax/crypto/SecretKey;

generateServerKeyPair

public static KeyPair generateServerKeyPair()
                                     throws NetworkEncryptionException

Returns a new 1024 bit RSA public/private key pair.

Returns:

a new 1024 bit RSA public/private key pair

Throws:

NetworkEncryptionException - when generation fails

Mappings:

Namespace	Name	Mixin selector
official	b	Laqw;b()Ljava/security/KeyPair;
intermediary	method_15237	Lnet/minecraft/class_3515;method_15237()Ljava/security/KeyPair;
named	generateServerKeyPair	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;generateServerKeyPair()Ljava/security/KeyPair;

computeServerId

public static byte[] computeServerId(String baseServerId,
 PublicKey publicKey,
 SecretKey secretKey)
                              throws NetworkEncryptionException

Returns the computed server ID.

Returns:

the computed server ID

Throws:

NetworkEncryptionException - when computation fails

Implementation Note:

The server ID is a SHA-1 hash of ISO-8859-1 encoded baseServerId, publicKey, and secretKey.

Mappings:

Namespace	Name	Mixin selector
official	a	Laqw;a(Ljava/lang/String;Ljava/security/PublicKey;Ljavax/crypto/SecretKey;)[B
intermediary	method_15240	Lnet/minecraft/class_3515;method_15240(Ljava/lang/String;Ljava/security/PublicKey;Ljavax/crypto/SecretKey;)[B
named	computeServerId	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;computeServerId(Ljava/lang/String;Ljava/security/PublicKey;Ljavax/crypto/SecretKey;)[B

hash

private static byte[] hash(byte[][] bytes)
                    throws Exception

Returns the SHA-1 hash of bytes.

Returns:

the SHA-1 hash of bytes

Throws:

Exception

Mappings:

Namespace	Name	Mixin selector
official	a	Laqw;a([[B)[B
intermediary	method_15236	Lnet/minecraft/class_3515;method_15236([[B)[B
named	hash	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;hash([[B)[B

decodePem

private static <T extends Key> T decodePem(String key,
 String prefix,
 String suffix,
 NetworkEncryptionUtils.KeyDecoder<T> decoder)
                                    throws NetworkEncryptionException

Decodes a PEM-formatted string key.

A PEM-formatted key is prefix, followed by Base64 encoded key, followed by suffix. Note that this method also allows Base64 encoded keys that have neither the prefix or the suffix.

Throws:

NetworkEncryptionException - when the decoder throws, e.g. due to invalid key content

Mappings:

Namespace	Name	Mixin selector
official	a	Laqw;a(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Laqw$a;)Ljava/security/Key;
intermediary	method_43520	Lnet/minecraft/class_3515;method_43520(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Lnet/minecraft/class_3515$class_7424;)Ljava/security/Key;
named	decodePem	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;decodePem(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Lnet/minecraft/network/encryption/NetworkEncryptionUtils$KeyDecoder;)Ljava/security/Key;

decodeRsaPrivateKeyPem

public static PrivateKey decodeRsaPrivateKeyPem(String key)
                                         throws NetworkEncryptionException

Decodes a PEM-formatted RSA private key.

A PEM-formatted RSA private key is "-----BEGIN RSA PRIVATE KEY-----", followed by Base64 encoded PCKS #8 encoded key, followed by "-----END RSA PRIVATE KEY-----". Note that this method also allows Base64 encoded keys that have neither the prefix or the suffix.

Throws:

NetworkEncryptionException - when the key is malformed

See Also:

• encodeRsaPrivateKey(PrivateKey)
• encodeRsaPublicKey(PublicKey)
• decodeRsaPublicKeyPem(String)

Mappings:

Namespace	Name	Mixin selector
official	a	Laqw;a(Ljava/lang/String;)Ljava/security/PrivateKey;
intermediary	method_43519	Lnet/minecraft/class_3515;method_43519(Ljava/lang/String;)Ljava/security/PrivateKey;
named	decodeRsaPrivateKeyPem	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;decodeRsaPrivateKeyPem(Ljava/lang/String;)Ljava/security/PrivateKey;

decodeRsaPublicKeyPem

public static PublicKey decodeRsaPublicKeyPem(String key)
                                       throws NetworkEncryptionException

Decodes a PEM-formatted RSA public key.

A PEM-formatted RSA public key is "-----BEGIN RSA PUBLIC KEY-----", followed by Base64 encoded X.509 encoded key, followed by "-----END RSA PUBLIC KEY-----". Note that this method also allows Base64 encoded keys that have neither the prefix or the suffix.

Throws:

NetworkEncryptionException - when the key is malformed

See Also:

• encodeRsaPrivateKey(PrivateKey)
• encodeRsaPublicKey(PublicKey)
• decodeRsaPrivateKeyPem(String)

Mappings:

Namespace	Name	Mixin selector
official	b	Laqw;b(Ljava/lang/String;)Ljava/security/PublicKey;
intermediary	method_43524	Lnet/minecraft/class_3515;method_43524(Ljava/lang/String;)Ljava/security/PublicKey;
named	decodeRsaPublicKeyPem	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;decodeRsaPublicKeyPem(Ljava/lang/String;)Ljava/security/PublicKey;

encodeRsaPublicKey

public static String encodeRsaPublicKey(PublicKey key)

Encodes an RSA public key to a PEM-formatted key string.

A PEM-formatted RSA public key is "-----BEGIN RSA PUBLIC KEY-----", followed by Base64 encoded X.509 encoded key, followed by "-----END RSA PUBLIC KEY-----".

Throws:

IllegalArgumentException - when non-RSA key is passed

See Also:

• encodeRsaPrivateKey(PrivateKey)
• decodeRsaPrivateKeyPem(String)
• decodeRsaPublicKeyPem(String)

Mappings:

Namespace	Name	Mixin selector
official	a	Laqw;a(Ljava/security/PublicKey;)Ljava/lang/String;
intermediary	method_43522	Lnet/minecraft/class_3515;method_43522(Ljava/security/PublicKey;)Ljava/lang/String;
named	encodeRsaPublicKey	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;encodeRsaPublicKey(Ljava/security/PublicKey;)Ljava/lang/String;

encodeRsaPrivateKey

public static String encodeRsaPrivateKey(PrivateKey key)

Encodes an RSA private key to a PEM-formatted key string.

A PEM-formatted RSA private key is "-----BEGIN RSA PRIVATE KEY-----", followed by Base64 encoded PCKS #8 encoded key, followed by "-----END RSA PRIVATE KEY-----".

Throws:

IllegalArgumentException - when non-RSA key is passed

See Also:

• encodeRsaPublicKey(PublicKey)
• decodeRsaPrivateKeyPem(String)
• decodeRsaPublicKeyPem(String)

Mappings:

Namespace	Name	Mixin selector
official	a	Laqw;a(Ljava/security/PrivateKey;)Ljava/lang/String;
intermediary	method_43521	Lnet/minecraft/class_3515;method_43521(Ljava/security/PrivateKey;)Ljava/lang/String;
named	encodeRsaPrivateKey	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;encodeRsaPrivateKey(Ljava/security/PrivateKey;)Ljava/lang/String;

decodeEncodedRsaPrivateKey

private static PrivateKey decodeEncodedRsaPrivateKey(byte[] key)
                                              throws NetworkEncryptionException

Decodes a PCKS #8-encoded RSA private key.

Throws:

NetworkEncryptionException - when the key is malformed

See Also:

• decodeRsaPrivateKeyPem(String)

Mappings:

Namespace	Name	Mixin selector
official	b	Laqw;b([B)Ljava/security/PrivateKey;
intermediary	method_43525	Lnet/minecraft/class_3515;method_43525([B)Ljava/security/PrivateKey;
named	decodeEncodedRsaPrivateKey	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;decodeEncodedRsaPrivateKey([B)Ljava/security/PrivateKey;

decodeEncodedRsaPublicKey

public static PublicKey decodeEncodedRsaPublicKey(byte[] key)
                                           throws NetworkEncryptionException

Decodes a X.509-encoded RSA public key.

Throws:

NetworkEncryptionException - when the key is malformed

See Also:

• decodeRsaPublicKeyPem(String)

Mappings:

Namespace	Name	Mixin selector
official	a	Laqw;a([B)Ljava/security/PublicKey;
intermediary	method_15242	Lnet/minecraft/class_3515;method_15242([B)Ljava/security/PublicKey;
named	decodeEncodedRsaPublicKey	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;decodeEncodedRsaPublicKey([B)Ljava/security/PublicKey;

decryptSecretKey

public static SecretKey decryptSecretKey(PrivateKey privateKey,
 byte[] encryptedSecretKey)
                                  throws NetworkEncryptionException

Decrypts RSA-encrypted AES secret key.

Throws:

NetworkEncryptionException - when the secret key is malformed

Mappings:

Namespace	Name	Mixin selector
official	a	Laqw;a(Ljava/security/PrivateKey;[B)Ljavax/crypto/SecretKey;
intermediary	method_15234	Lnet/minecraft/class_3515;method_15234(Ljava/security/PrivateKey;[B)Ljavax/crypto/SecretKey;
named	decryptSecretKey	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;decryptSecretKey(Ljava/security/PrivateKey;[B)Ljavax/crypto/SecretKey;

encrypt

public static byte[] encrypt(Key key,
 byte[] data)
                      throws NetworkEncryptionException

Encrypts a data. The algorithm is determined from the key used.

Parameters:

key - encryption key (e.g. AES secret key or RSA public key)

Throws:

NetworkEncryptionException - when encryption fails, e.g. due to invalid key

See Also:

• decrypt(Key, byte[])

Mappings:

Namespace	Name	Mixin selector
official	a	Laqw;a(Ljava/security/Key;[B)[B
intermediary	method_15238	Lnet/minecraft/class_3515;method_15238(Ljava/security/Key;[B)[B
named	encrypt	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;encrypt(Ljava/security/Key;[B)[B

decrypt

public static byte[] decrypt(Key key,
 byte[] data)
                      throws NetworkEncryptionException

Decrypts an encrypted data. The algorithm is determined from the key used.

Parameters:

key - decryption key (e.g. AES secret key or RSA private key)

Throws:

NetworkEncryptionException - when decryption fails, e.g. due to invalid key

See Also:

• encrypt(Key, byte[])

Mappings:

Namespace	Name	Mixin selector
official	b	Laqw;b(Ljava/security/Key;[B)[B
intermediary	method_15243	Lnet/minecraft/class_3515;method_15243(Ljava/security/Key;[B)[B
named	decrypt	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;decrypt(Ljava/security/Key;[B)[B

crypt

private static byte[] crypt(int opMode,
 Key key,
 byte[] data)
                     throws NetworkEncryptionException

Low-level API to perform encryption or decryption operation.

Throws:

NetworkEncryptionException - when the operation fails

Mappings:

Namespace	Name	Mixin selector
official	a	Laqw;a(ILjava/security/Key;[B)[B
intermediary	method_15244	Lnet/minecraft/class_3515;method_15244(ILjava/security/Key;[B)[B
named	crypt	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;crypt(ILjava/security/Key;[B)[B

createCipher

private static Cipher createCipher(int opMode,
 String algorithm,
 Key key)
                            throws Exception

Creates a cipher to perform encryption or decryption operation.

Throws:

Exception

Mappings:

Namespace	Name	Mixin selector
official	a	Laqw;a(ILjava/lang/String;Ljava/security/Key;)Ljavax/crypto/Cipher;
intermediary	method_15241	Lnet/minecraft/class_3515;method_15241(ILjava/lang/String;Ljava/security/Key;)Ljavax/crypto/Cipher;
named	createCipher	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;createCipher(ILjava/lang/String;Ljava/security/Key;)Ljavax/crypto/Cipher;

cipherFromKey

public static Cipher cipherFromKey(int opMode,
 Key key)
                            throws NetworkEncryptionException

Creates an AES cipher from the key.

Parameters:

key - the AES secret key

Throws:

NetworkEncryptionException - when creation fails, e.g. due to invalid key

Mappings:

Namespace	Name	Mixin selector
official	a	Laqw;a(ILjava/security/Key;)Ljavax/crypto/Cipher;
intermediary	method_15235	Lnet/minecraft/class_3515;method_15235(ILjava/security/Key;)Ljavax/crypto/Cipher;
named	cipherFromKey	Lnet/minecraft/network/encryption/NetworkEncryptionUtils;cipherFromKey(ILjava/security/Key;)Ljavax/crypto/Cipher;