Signature Class

Definition

[Android.Runtime.Register("java/security/Signature", DoNotGenerateAcw=true)]
public abstract class Signature : Java.Security.SignatureSpi

[<Android.Runtime.Register("java/security/Signature", DoNotGenerateAcw=true)>]
type Signature = class
    inherit SignatureSpi

Inheritance

Object

Object

SignatureSpi

Signature

Attributes

RegisterAttribute

Remarks

The Signature class is used to provide applications the functionality of a digital signature algorithm. Digital signatures are used for authentication and integrity assurance of digital data.

The signature algorithm can be, among others, the NIST standard DSA, using DSA and SHA-1. The DSA algorithm using the SHA-1 message digest algorithm can be specified as SHA1withDSA. In the case of RSA, there are multiple choices for the message digest algorithm, so the signing algorithm could be specified as, for example, MD2withRSA, MD5withRSA, or SHA1withRSA. The algorithm name must be specified, as there is no default.

A Signature object can be used to generate and verify digital signatures.

There are three phases to the use of a Signature object for either signing data or verifying a signature:<ol>

<li>Initialization, with either

<ul>

<li>a public key, which initializes the signature for verification (see #initVerify(PublicKey) initVerify), or

<li>a private key (and optionally a Secure Random Number Generator), which initializes the signature for signing (see #initSign(PrivateKey) and #initSign(PrivateKey, SecureRandom)).

</ul>

<li>Updating

Depending on the type of initialization, this will update the bytes to be signed or verified. See the #update(byte) update methods.

<li>Signing or Verifying a signature on all updated bytes. See the #sign() sign methods and the #verify(byte[]) verify method.

</ol>

Note that this class is abstract and extends from SignatureSpi for historical reasons. Application developers should only take notice of the methods defined in this Signature class; all the methods in the superclass are intended for cryptographic service providers who wish to supply their own implementations of digital signature algorithms.

Android provides the following Signature algorithms: <table> <thead> <tr> <th>Algorithm</th> <th>Supported API Levels</th> </tr> </thead> <tbody> <tr> <td>DSA</td> <td>1+</td> </tr> <tr> <td>DSAwithSHA1</td> <td>1+</td> </tr> <tr class="deprecated"> <td>DSS</td> <td>1-19</td> </tr> <tr> <td>ECDSA</td> <td>11+</td> </tr> <tr> <td>ECDSAwithSHA1</td> <td>11+</td> </tr> <tr class="deprecated"> <td>MD2withRSA</td> <td>1-3</td> </tr> <tr class="deprecated"> <td>MD4withRSA</td> <td>1-8</td> </tr> <tr> <td>MD5withRSA</td> <td>1+</td> </tr> <tr class="deprecated"> <td>MD5withRSA/ISO9796-2</td> <td>1-8</td> </tr> <tr> <td>NONEwithDSA</td> <td>1+</td> </tr> <tr> <td>NONEwithECDSA</td> <td>11+</td> </tr> <tr> <td>NONEwithRSA</td> <td>17+</td> </tr> <tr class="deprecated"> <td>RSASSA-PSS</td> <td>1-8</td> </tr> <tr> <td>SHA1withDSA</td> <td>1+</td> </tr> <tr> <td>SHA1withECDSA</td> <td>11+</td> </tr> <tr> <td>SHA1withRSA</td> <td>1+</td> </tr> <tr class="deprecated"> <td>SHA1withRSA/ISO9796-2</td> <td>1-8</td> </tr> <tr> <td>SHA1withRSA/PSS</td> <td>23+</td> </tr> <tr> <td>SHA224withDSA</td> <td>20+</td> </tr> <tr> <td>SHA224withECDSA</td> <td>20+</td> </tr> <tr> <td>SHA224withRSA</td> <td>20+</td> </tr> <tr> <td>SHA224withRSA/PSS</td> <td>23+</td> </tr> <tr> <td>SHA256withDSA</td> <td>1+</td> </tr> <tr> <td>SHA256withECDSA</td> <td>11+</td> </tr> <tr> <td>SHA256withRSA</td> <td>1+</td> </tr> <tr> <td>SHA256withRSA/PSS</td> <td>23+</td> </tr> <tr> <td>SHA384withECDSA</td> <td>11+</td> </tr> <tr> <td>SHA384withRSA</td> <td>1+</td> </tr> <tr> <td>SHA384withRSA/PSS</td> <td>23+</td> </tr> <tr> <td>SHA512withECDSA</td> <td>11+</td> </tr> <tr> <td>SHA512withRSA</td> <td>1+</td> </tr> <tr> <td>SHA512withRSA/PSS</td> <td>23+</td> </tr> </tbody> </table>

These algorithms are described in the Signature section of the Java Cryptography Architecture Standard Algorithm Name Documentation.

Java documentation for java.security.Signature.

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

Constructors

Fields

Properties

Methods

Explicit Interface Implementations

Extension Methods

Applies to