com.nimbusds.jose

Class EncryptionMethod

java.lang.Object

com.nimbusds.jose.Algorithm

com.nimbusds.jose.EncryptionMethod

All Implemented Interfaces:

net.minidev.json.JSONAware

@Immutable
public final class EncryptionMethod
extends Algorithm

Encryption method name, represents the enc header parameter in JSON Web Encryption (JWE) objects. This class is immutable.

Includes constants for the following standard encryption method names:

• A128CBC-HS256
• A192CBC-HS384
• A256CBC-HS512
• A128GCM
• A192GCM
• A256GCM

Additional encryption method names can be defined using the constructors.

Version:

$version$ (2013-08-20)

Author:

Vladimir Dzhuvinov

Field Summary

Fields

Modifier and Type	Field and Description
static EncryptionMethod	A128CBC_HS256 AES_128_CBC_HMAC_SHA_256 authenticated encryption using a 256 bit key (required).
static EncryptionMethod	A128GCM AES in Galois/Counter Mode (GCM) (NIST.800-38D) using a 128 bit key (recommended).
static EncryptionMethod	A192CBC_HS384 AES_192_CBC_HMAC_SHA_384 authenticated encryption using a 384 bit key (optional).
static EncryptionMethod	A192GCM AES in Galois/Counter Mode (GCM) (NIST.800-38D) using a 192 bit key (optional).
static EncryptionMethod	A256CBC_HS512 AES_256_CBC_HMAC_SHA_512 authenticated encryption using a 512 bit key (required).
static EncryptionMethod	A256GCM AES in Galois/Counter Mode (GCM) (NIST.800-38D) using a 256 bit key (recommended).

Fields inherited from class com.nimbusds.jose.Algorithm

NONE

Constructor Summary

Constructors

Constructor and Description
EncryptionMethod(String name) Creates a new encryption method.
EncryptionMethod(String name, Requirement req) Creates a new encryption method.
EncryptionMethod(String name, Requirement req, int cekBitLength) Creates a new encryption method.

Method Summary

Methods

Modifier and Type	Method and Description
int	cekBitLength() Gets the length of the associated Content Encryption Key (CEK).
static EncryptionMethod	parse(String s) Parses an encryption method from the specified string.

Methods inherited from class com.nimbusds.jose.Algorithm

equals, getName, getRequirement, hashCode, toJSONString, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

A128CBC_HS256

public static final EncryptionMethod A128CBC_HS256

AES_128_CBC_HMAC_SHA_256 authenticated encryption using a 256 bit key (required).

A192CBC_HS384

public static final EncryptionMethod A192CBC_HS384

AES_192_CBC_HMAC_SHA_384 authenticated encryption using a 384 bit key (optional).

A256CBC_HS512

public static final EncryptionMethod A256CBC_HS512

AES_256_CBC_HMAC_SHA_512 authenticated encryption using a 512 bit key (required).

A128GCM

public static final EncryptionMethod A128GCM

AES in Galois/Counter Mode (GCM) (NIST.800-38D) using a 128 bit key (recommended).

A192GCM

public static final EncryptionMethod A192GCM

AES in Galois/Counter Mode (GCM) (NIST.800-38D) using a 192 bit key (optional).

A256GCM

public static final EncryptionMethod A256GCM

AES in Galois/Counter Mode (GCM) (NIST.800-38D) using a 256 bit key (recommended).

Constructor Detail

EncryptionMethod

public EncryptionMethod(String name,
                Requirement req,
                int cekBitLength)

Creates a new encryption method.

Parameters:

name - The encryption method name. Must not be null.

req - The implementation requirement, null if not known.

cekBitLength - The Content Encryption Key (CEK) bit length, zero if not specified.

EncryptionMethod

public EncryptionMethod(String name,
                Requirement req)

Creates a new encryption method. The Content Encryption Key (CEK) bit length is not specified.

Parameters:

name - The encryption method name. Must not be null.

req - The implementation requirement, null if not known.

EncryptionMethod

public EncryptionMethod(String name)

Creates a new encryption method. The implementation requirement and the Content Encryption Key (CEK) bit length are not specified.

Parameters:

name - The encryption method name. Must not be null.

Method Detail

cekBitLength

public int cekBitLength()

Gets the length of the associated Content Encryption Key (CEK).

Returns:

The Content Encryption Key (CEK) bit length, zero if not specified.

parse

public static EncryptionMethod parse(String s)

Parses an encryption method from the specified string.

Parameters:

s - The string to parse. Must not be null.

Returns:

The encryption method (matching standard algorithm constant, else a newly created algorithm).