Package com.nimbusds.jose.crypto.impl
Class DirectCryptoProvider
- java.lang.Object
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- com.nimbusds.jose.crypto.impl.DirectCryptoProvider
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- All Implemented Interfaces:
JCAAware<JWEJCAContext>
,JOSEProvider
,JWEProvider
- Direct Known Subclasses:
DirectDecrypter
,DirectEncrypter
public abstract class DirectCryptoProvider extends Object
The base abstract class for direct encrypters and decrypters ofJWE objects
with a shared symmetric key.Supports the following key management algorithms:
Supports the following content encryption algorithms:
- Version:
- 2023-07-11
- Author:
- Vladimir Dzhuvinov
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Field Summary
Fields Modifier and Type Field Description static Set<JWEAlgorithm>
SUPPORTED_ALGORITHMS
The supported JWE algorithms by the direct crypto provider class.static Set<EncryptionMethod>
SUPPORTED_ENCRYPTION_METHODS
The supported encryption methods by the direct crypto provider class.
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Constructor Summary
Constructors Modifier Constructor Description protected
DirectCryptoProvider(SecretKey cek)
Creates a new direct encryption / decryption provider.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected SecretKey
getCEK(EncryptionMethod enc)
Returns the content encryption key (CEK) to use.JWEJCAContext
getJCAContext()
Returns the Java Cryptography Architecture (JCA) context.SecretKey
getKey()
Gets the Content Encryption Key (CEK).protected boolean
isCEKProvided()
Returnstrue
if a content encryption key (CEK) was provided at construction time.Set<EncryptionMethod>
supportedEncryptionMethods()
Returns the names of the supported encryption methods by the JWE provier.Set<JWEAlgorithm>
supportedJWEAlgorithms()
Returns the names of the supported algorithms by the JWE provider instance.
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Field Detail
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SUPPORTED_ALGORITHMS
public static final Set<JWEAlgorithm> SUPPORTED_ALGORITHMS
The supported JWE algorithms by the direct crypto provider class.
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SUPPORTED_ENCRYPTION_METHODS
public static final Set<EncryptionMethod> SUPPORTED_ENCRYPTION_METHODS
The supported encryption methods by the direct crypto provider class.
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Constructor Detail
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DirectCryptoProvider
protected DirectCryptoProvider(SecretKey cek) throws KeyLengthException
Creates a new direct encryption / decryption provider.- Parameters:
cek
- The Content Encryption Key (CEK). Must be 128 bits (16 bytes), 192 bits (24 bytes), 256 bits (32 bytes), 384 bits (48 bytes) or 512 bits (64 bytes) long. Must not benull
.- Throws:
KeyLengthException
- If the CEK length is not compatible.
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Method Detail
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supportedJWEAlgorithms
public Set<JWEAlgorithm> supportedJWEAlgorithms()
Description copied from interface:JWEProvider
Returns the names of the supported algorithms by the JWE provider instance. These correspond to thealg
JWE header parameter.- Specified by:
supportedJWEAlgorithms
in interfaceJWEProvider
- Returns:
- The supported JWE algorithms, empty set if none.
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supportedEncryptionMethods
public Set<EncryptionMethod> supportedEncryptionMethods()
Description copied from interface:JWEProvider
Returns the names of the supported encryption methods by the JWE provier. These correspond to theenc
JWE header parameter.- Specified by:
supportedEncryptionMethods
in interfaceJWEProvider
- Returns:
- The supported encryption methods, empty set if none.
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getJCAContext
public JWEJCAContext getJCAContext()
Description copied from interface:JCAAware
Returns the Java Cryptography Architecture (JCA) context. May be used to set a specific JCA security provider or secure random generator.- Specified by:
getJCAContext
in interfaceJCAAware<JWEJCAContext>
- Returns:
- The JCA context. Not
null
.
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isCEKProvided
protected boolean isCEKProvided()
Returnstrue
if a content encryption key (CEK) was provided at construction time.- Returns:
true
if a CEK was provided at construction time,false
if CEKs will be internally generated.
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getCEK
protected SecretKey getCEK(EncryptionMethod enc) throws JOSEException
Returns the content encryption key (CEK) to use. Unless a CEK was provided at construction time this will be a new internally generated CEK.- Parameters:
enc
- The encryption method. Must not benull
.- Returns:
- The content encryption key (CEK).
- Throws:
JOSEException
- If an internal exception is encountered.
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