org.wso2.carbon.crypto.api

Interface CryptoService

public interface CryptoService

The service contract of an implementation of a crypto service.

The service provides crypto related functionality such as signing and decrypting.

Method Summary

Modifier and Type	Method and Description
byte[]	decrypt(byte[] ciphertext, String algorithm, String javaSecurityAPIProvider) Computes and returns the cleartext of the given ciphertext.
byte[]	decrypt(byte[] ciphertext, String algorithm, String javaSecurityAPIProvider, CryptoContext cryptoContext) Computes and returns the cleartext of the given ciphertext comes from an external entity.
byte[]	encrypt(byte[] cleartext, String algorithm, String javaSecurityAPIProvider) Computes and returns the ciphertext of the given cleartext.
byte[]	encrypt(byte[] cleartext, String algorithm, String javaSecurityAPIProvider, CryptoContext cryptoContext) Computes and returns the ciphertext of the given cleartext, using asymmetric cryptography.
Certificate	getCertificate(CryptoContext cryptoContext) Returns the Certificate based on the given CryptoContext
byte[]	sign(byte[] data, String algorithm, String javaSecurityAPIProvider, CryptoContext cryptoContext) Computes and returns the signature of given data.
boolean	verifySignature(byte[] data, byte[] signature, String algorithm, String javaSecurityAPIProvider, CryptoContext cryptoContext) Verifies whether given signature of the given data was generated by a trusted external party.

Method Detail

encrypt

byte[] encrypt(byte[] cleartext,
               String algorithm,
               String javaSecurityAPIProvider)
        throws CryptoException

Computes and returns the ciphertext of the given cleartext.

The encrypted data is only for internal usage (e.g. encrypting passwords before persisting), therefore the ciphertext is NOT supposed to be shared with other systems.

Parameters:

cleartext - The cleartext to be encrypted.

algorithm - The encryption / decryption algorithm

javaSecurityAPIProvider - The Java Security API provider.

Returns:

The ciphertext

Throws:

CryptoException - If something unexpected happens during the encryption operation.

decrypt

byte[] decrypt(byte[] ciphertext,
               String algorithm,
               String javaSecurityAPIProvider)
        throws CryptoException

Computes and returns the cleartext of the given ciphertext.

The input ciphertext should be a ciphertext which was generated from encrypt(byte[], String, String) method.

Parameters:

ciphertext - The ciphertext to be decrypted.

algorithm - The signature + hashing algorithm to be used in signing.

javaSecurityAPIProvider - The Java Security API provider.

Returns:

The cleartext

Throws:

CryptoException - If something unexpected happens during the decryption operation.

sign

byte[] sign(byte[] data,
            String algorithm,
            String javaSecurityAPIProvider,
            CryptoContext cryptoContext)
     throws CryptoException

Computes and returns the signature of given data.

Parameters:

data - The content which the signature should be generated against.

algorithm - The signature + hashing algorithm to be used in signing.

javaSecurityAPIProvider - The Java Security API provider.

cryptoContext - The context information which is needed to discover the private key.

Returns:

The digital signature of given data.

Throws:

CryptoException - If something unexpected happens during the signing operation.

decrypt

byte[] decrypt(byte[] ciphertext,
               String algorithm,
               String javaSecurityAPIProvider,
               CryptoContext cryptoContext)
        throws CryptoException

Computes and returns the cleartext of the given ciphertext comes from an external entity. Asymmetric cryptography is used for decryption.

Parameters:

ciphertext - The content which the signature should be generated against.

algorithm - The signature + hashing algorithm to be used in signing.

javaSecurityAPIProvider - The Java Security API provider.

cryptoContext - The context information which is needed to discover the private key.

Returns:

An array of bytes which contains the signature.

Throws:

CryptoException - If something unexpected happens during the decryption operation.

encrypt

byte[] encrypt(byte[] cleartext,
               String algorithm,
               String javaSecurityAPIProvider,
               CryptoContext cryptoContext)
        throws CryptoException

Computes and returns the ciphertext of the given cleartext, using asymmetric cryptography. This ciphertext is indented to be used and decrypted by an external entity.

Parameters:

cleartext - The cleartext to be encrypted.

algorithm - The signature + hashing algorithm to be used in signing.

javaSecurityAPIProvider - The Java Security API provider.

cryptoContext - The context information which is needed to discover the public key of the external entity.

Returns:

The encrypted data.

Throws:

CryptoException - If something unexpected happens during the encryption operation.

verifySignature

boolean verifySignature(byte[] data,
                        byte[] signature,
                        String algorithm,
                        String javaSecurityAPIProvider,
                        CryptoContext cryptoContext)
                 throws CryptoException

Verifies whether given signature of the given data was generated by a trusted external party.

Parameters:

data - The data which was the signature generated on.

signature - The signature bytes of data.

algorithm - The signature + hashing algorithm to be used in signing.

javaSecurityAPIProvider - The Java Security API provider.

cryptoContext - The context information which is needed to discover the public key of the external entity.

Returns:

true if signature can be verified, false otherwise.

Throws:

CryptoException - If something unexpected happens during the signature verification.

getCertificate

Certificate getCertificate(CryptoContext cryptoContext)
                    throws CryptoException

Returns the Certificate based on the given CryptoContext

Parameters:

cryptoContext - The context information which is used to discover the public key of the external entity.

Returns:

The Certificate relates with the given context.

Throws:

CryptoException - If something unexpected happens during certificate discovery.