# KeySpec Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) Summary: # KeySpec ` public interface KeySpec ` ` ` |----------------------------| | java.security.spec.KeySpec | 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| Known indirect subclasses [DESKeySpec](https://developer.android.com/reference/javax/crypto/spec/DESKeySpec),[DESedeKeySpec](https://developer.android.com/reference/javax/crypto/spec/DESedeKeySpec),[DHPrivateKeySpec](https://developer.android.com/reference/javax/crypto/spec/DHPrivateKeySpec),[DHPublicKeySpec](https://developer.android.com/reference/javax/crypto/spec/DHPublicKeySpec),[DSAPrivateKeySpec](https://developer.android.com/reference/java/security/spec/DSAPrivateKeySpec),[DSAPublicKeySpec](https://developer.android.com/reference/java/security/spec/DSAPublicKeySpec),[ECPrivateKeySpec](https://developer.android.com/reference/java/security/spec/ECPrivateKeySpec),[ECPublicKeySpec](https://developer.android.com/reference/java/security/spec/ECPublicKeySpec),[EdECPrivateKeySpec](https://developer.android.com/reference/java/security/spec/EdECPrivateKeySpec),[EdECPublicKeySpec](https://developer.android.com/reference/java/security/spec/EdECPublicKeySpec),[EncodedKeySpec](https://developer.android.com/reference/java/security/spec/EncodedKeySpec),[KeyInfo](https://developer.android.com/reference/android/security/keystore/KeyInfo),[PBEKeySpec](https://developer.android.com/reference/javax/crypto/spec/PBEKeySpec),[PKCS8EncodedKeySpec](https://developer.android.com/reference/java/security/spec/PKCS8EncodedKeySpec),[RSAMultiPrimePrivateCrtKeySpec](https://developer.android.com/reference/java/security/spec/RSAMultiPrimePrivateCrtKeySpec), and 8 others. |-----------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [DESKeySpec](https://developer.android.com/reference/javax/crypto/spec/DESKeySpec) | This class specifies a DES key. | | [DESedeKeySpec](https://developer.android.com/reference/javax/crypto/spec/DESedeKeySpec) | This class specifies a DES-EDE ("triple-DES") key. | | [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. | | [DSAPrivateKeySpec](https://developer.android.com/reference/java/security/spec/DSAPrivateKeySpec) | This class specifies a DSA private key with its associated parameters. | | [DSAPublicKeySpec](https://developer.android.com/reference/java/security/spec/DSAPublicKeySpec) | This class specifies a DSA public key with its associated parameters. | | [ECPrivateKeySpec](https://developer.android.com/reference/java/security/spec/ECPrivateKeySpec) | This immutable class specifies an elliptic curve private key with its associated parameters. | | [ECPublicKeySpec](https://developer.android.com/reference/java/security/spec/ECPublicKeySpec) | This immutable class specifies an elliptic curve public key with its associated parameters. | | [EdECPrivateKeySpec](https://developer.android.com/reference/java/security/spec/EdECPrivateKeySpec) | A class representing elliptic curve private keys as defined in[RFC 8032: Edwards-Curve Digital Signature Algorithm (EdDSA)](https://tools.ietf.org/html/rfc8032), including the curve and other algorithm parameters. | | [EdECPublicKeySpec](https://developer.android.com/reference/java/security/spec/EdECPublicKeySpec) | A class representing elliptic curve public keys as defined in[RFC 8032: Edwards-Curve Digital Signature Algorithm (EdDSA)](https://tools.ietf.org/html/rfc8032), including the curve and other algorithm parameters. | | [EncodedKeySpec](https://developer.android.com/reference/java/security/spec/EncodedKeySpec) | This class represents a public or private key in encoded format. | | [KeyInfo](https://developer.android.com/reference/android/security/keystore/KeyInfo) | Information about a key from the[Android Keystore system](https://developer.android.com/training/articles/keystore). | | [PBEKeySpec](https://developer.android.com/reference/javax/crypto/spec/PBEKeySpec) | A user-chosen password that can be used with password-based encryption (*PBE*). | | [PKCS8EncodedKeySpec](https://developer.android.com/reference/java/security/spec/PKCS8EncodedKeySpec) | This class represents the ASN.1 encoding of a private key, encoded according to the ASN.1 type`PrivateKeyInfo`. | | [RSAMultiPrimePrivateCrtKeySpec](https://developer.android.com/reference/java/security/spec/RSAMultiPrimePrivateCrtKeySpec) | This class specifies an RSA multi-prime private key, as defined in the[PKCS#1 v2.2](https://tools.ietf.org/rfc/rfc8017.txt)standard using the Chinese Remainder Theorem (CRT) information values for efficiency. | | [RSAPrivateCrtKeySpec](https://developer.android.com/reference/java/security/spec/RSAPrivateCrtKeySpec) | This class specifies an RSA private key, as defined in the[PKCS#1 v2.2](https://tools.ietf.org/rfc/rfc8017.txt)standard, using the Chinese Remainder Theorem (CRT) information values for efficiency. | | [RSAPrivateKeySpec](https://developer.android.com/reference/java/security/spec/RSAPrivateKeySpec) | This class specifies an RSA private key. | | [RSAPublicKeySpec](https://developer.android.com/reference/java/security/spec/RSAPublicKeySpec) | This class specifies an RSA public key. | | [SecretKeySpec](https://developer.android.com/reference/javax/crypto/spec/SecretKeySpec) | This class specifies a secret key in a provider-independent fashion. | | [X509EncodedKeySpec](https://developer.android.com/reference/java/security/spec/X509EncodedKeySpec) | This class represents the ASN.1 encoding of a public key, encoded according to the ASN.1 type`SubjectPublicKeyInfo`. | | [XECPrivateKeySpec](https://developer.android.com/reference/java/security/spec/XECPrivateKeySpec) | A class representing elliptic curve private keys as defined in RFC 7748, including the curve and other algorithm parameters. | | [XECPublicKeySpec](https://developer.android.com/reference/java/security/spec/XECPublicKeySpec) | A class representing elliptic curve public keys as defined in RFC 7748, including the curve and other algorithm parameters. | | [XdhKeySpec](https://developer.android.com/reference/android/crypto/hpke/XdhKeySpec) | External Diffie\\u2013Hellman (XDH) key spec holding either a public or private key. | |
*** ** * ** *** A (transparent) specification of the key material that constitutes a cryptographic key. If the key is stored on a hardware device, its specification may contain information that helps identify the key on the device. A key may be specified in an algorithm-specific way, or in an algorithm-independent encoding format (such as ASN.1). For example, a DSA private key may be specified by its components`x`,`p`,`q`, and`g`(see[DSAPrivateKeySpec](https://developer.android.com/reference/java/security/spec/DSAPrivateKeySpec)), or it may be specified using its DER encoding (see[PKCS8EncodedKeySpec](https://developer.android.com/reference/java/security/spec/PKCS8EncodedKeySpec)). This interface contains no methods or constants. Its only purpose is to group (and provide type safety for) all key specifications. All key specifications must implement this interface. **See also:** - [Key](https://developer.android.com/reference/java/security/Key) - [KeyFactory](https://developer.android.com/reference/java/security/KeyFactory) - [EncodedKeySpec](https://developer.android.com/reference/java/security/spec/EncodedKeySpec) - [X509EncodedKeySpec](https://developer.android.com/reference/java/security/spec/X509EncodedKeySpec) - [PKCS8EncodedKeySpec](https://developer.android.com/reference/java/security/spec/PKCS8EncodedKeySpec) - [DSAPrivateKeySpec](https://developer.android.com/reference/java/security/spec/DSAPrivateKeySpec) - [DSAPublicKeySpec](https://developer.android.com/reference/java/security/spec/DSAPublicKeySpec)