# javax.crypto.spec Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) # javax.crypto.spec Provides classes and interfaces for key specifications and algorithm parameter specifications. A key specification is a transparent representation of the key material that constitutes a key. A key may be specified in an algorithm-specific way, or in an algorithm-independent encoding format (such as ASN.1). This package contains key specifications for Diffie-Hellman public and private keys, as well as key specifications for DES, Triple DES, and PBE secret keys. An algorithm parameter specification is a transparent representation of the sets of parameters used with an algorithm. This package contains algorithm parameter specifications for parameters used with the Diffie-Hellman, DES, Triple DES, PBE, RC2 and RC5 algorithms. ## Package Specification - PKCS #3: Diffie-Hellman Key-Agreement Standard, Version 1.4, November 1993. - PKCS #5: Password-Based Encryption Standard, Version 1.5, November 1993. - Federal Information Processing Standards Publication (FIPS PUB) 46-2: Data Encryption Standard (DES) ## Related Documentation For documentation that includes information about algorithm parameter and key specifications, please see: - [**Java^TM^Cryptography Architecture API Specification and Reference**](https://../technotes/guides/security/crypto/CryptoSpec.html) - [**How to Implement a Provider for the Java^TM^Cryptography Architecture**](https://../technotes/guides/security/crypto/HowToImplAProvider.html) ## Classes |----------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------| | [ChaCha20ParameterSpec](https://developer.android.com/reference/javax/crypto/spec/ChaCha20ParameterSpec) | This class specifies the parameters used with the[*ChaCha20*](https://tools.ietf.org/html/rfc7539)algorithm. | | [DESedeKeySpec](https://developer.android.com/reference/javax/crypto/spec/DESedeKeySpec) | This class specifies a DES-EDE ("triple-DES") key. | | [DESKeySpec](https://developer.android.com/reference/javax/crypto/spec/DESKeySpec) | This class specifies a DES key. | | [DHGenParameterSpec](https://developer.android.com/reference/javax/crypto/spec/DHGenParameterSpec) | This class specifies the set of parameters used for generating Diffie-Hellman (system) parameters for use in Diffie-Hellman key agreement. | | [DHParameterSpec](https://developer.android.com/reference/javax/crypto/spec/DHParameterSpec) | This class specifies the set of parameters used with the Diffie-Hellman algorithm, as specified in PKCS #3:*Diffie-Hellman Key-Agreement Standard*. | | [DHPrivateKeySpec](https://developer.android.com/reference/javax/crypto/spec/DHPrivateKeySpec) | This class specifies a Diffie-Hellman private key with its associated parameters. | | [DHPublicKeySpec](https://developer.android.com/reference/javax/crypto/spec/DHPublicKeySpec) | This class specifies a Diffie-Hellman public key with its associated parameters. | | [GCMParameterSpec](https://developer.android.com/reference/javax/crypto/spec/GCMParameterSpec) | Specifies the set of parameters required by a[Cipher](https://developer.android.com/reference/javax/crypto/Cipher)using the Galois/Counter Mode (GCM) mode. | | [IvParameterSpec](https://developer.android.com/reference/javax/crypto/spec/IvParameterSpec) | This class specifies an*initialization vector*(IV). | | [OAEPParameterSpec](https://developer.android.com/reference/javax/crypto/spec/OAEPParameterSpec) | This class specifies the set of parameters used with OAEP Padding, as defined in the[PKCS #1](http://www.ietf.org/rfc/rfc3447.txt)standard. | | [PBEKeySpec](https://developer.android.com/reference/javax/crypto/spec/PBEKeySpec) | A user-chosen password that can be used with password-based encryption (*PBE*). | | [PBEParameterSpec](https://developer.android.com/reference/javax/crypto/spec/PBEParameterSpec) | This class specifies the set of parameters used with password-based encryption (PBE), as defined in the[PKCS #5](http://www.ietf.org/rfc/rfc2898.txt)standard. | | [PSource](https://developer.android.com/reference/javax/crypto/spec/PSource) | This class specifies the source for encoding input P in OAEP Padding, as defined in the[PKCS #1](http://www.ietf.org/rfc/rfc3447.txt)standard. | | [PSource.PSpecified](https://developer.android.com/reference/javax/crypto/spec/PSource.PSpecified) | This class is used to explicitly specify the value for encoding input P in OAEP Padding. | | [RC2ParameterSpec](https://developer.android.com/reference/javax/crypto/spec/RC2ParameterSpec) | This class specifies the parameters used with the[*RC2*](http://www.ietf.org/rfc/rfc2268.txt)algorithm. | | [RC5ParameterSpec](https://developer.android.com/reference/javax/crypto/spec/RC5ParameterSpec) | This class specifies the parameters used with the[*RC5*](http://www.ietf.org/rfc/rfc2040.txt)algorithm. | | [SecretKeySpec](https://developer.android.com/reference/javax/crypto/spec/SecretKeySpec) | This class specifies a secret key in a provider-independent fashion. | - ## Classes - [ChaCha20ParameterSpec](https://developer.android.com/reference/javax/crypto/spec/ChaCha20ParameterSpec) - [DESedeKeySpec](https://developer.android.com/reference/javax/crypto/spec/DESedeKeySpec) - [DESKeySpec](https://developer.android.com/reference/javax/crypto/spec/DESKeySpec) - [DHGenParameterSpec](https://developer.android.com/reference/javax/crypto/spec/DHGenParameterSpec) - [DHParameterSpec](https://developer.android.com/reference/javax/crypto/spec/DHParameterSpec) - [DHPrivateKeySpec](https://developer.android.com/reference/javax/crypto/spec/DHPrivateKeySpec) - [DHPublicKeySpec](https://developer.android.com/reference/javax/crypto/spec/DHPublicKeySpec) - [GCMParameterSpec](https://developer.android.com/reference/javax/crypto/spec/GCMParameterSpec) - [IvParameterSpec](https://developer.android.com/reference/javax/crypto/spec/IvParameterSpec) - [OAEPParameterSpec](https://developer.android.com/reference/javax/crypto/spec/OAEPParameterSpec) - [PBEKeySpec](https://developer.android.com/reference/javax/crypto/spec/PBEKeySpec) - [PBEParameterSpec](https://developer.android.com/reference/javax/crypto/spec/PBEParameterSpec) - [PSource](https://developer.android.com/reference/javax/crypto/spec/PSource) - [PSource.PSpecified](https://developer.android.com/reference/javax/crypto/spec/PSource.PSpecified) - [RC2ParameterSpec](https://developer.android.com/reference/javax/crypto/spec/RC2ParameterSpec) - [RC5ParameterSpec](https://developer.android.com/reference/javax/crypto/spec/RC5ParameterSpec) - [SecretKeySpec](https://developer.android.com/reference/javax/crypto/spec/SecretKeySpec)