DSA DSA DSA DSA Class

Definition

Represents the abstract base class from which all implementations of the Digital Signature Algorithm (DSA) must inherit.

public ref class DSA abstract : System::Security::Cryptography::AsymmetricAlgorithm
[System.Runtime.InteropServices.ComVisible(true)]
public abstract class DSA : System.Security.Cryptography.AsymmetricAlgorithm
type DSA = class
    inherit AsymmetricAlgorithm
Public MustInherit Class DSA
Inherits AsymmetricAlgorithm
Inheritance
Derived
Attributes

Remarks

You can use the DSA class and derived classes to create digital signatures that help protect the integrity of your data. The DSACryptoServiceProvider provides an implementation of this class.

To use a public-key system to digitally sign a message, the sender first applies a hash function to the message to create a message digest. The sender then encrypts the message digest with the sender's private key to create the sender's personal signature. Upon receiving the message and signature, the receiver decrypts the signature using the sender's public key to recover the message digest and hashes the message using the same hash algorithm that the sender used. If the message digest that the receiver computes exactly matches the message digest received from the sender, the receiver can assume that the message was not altered while in transit. Note that a signature can be verified by anyone, because the sender's public key is common knowledge.

Newer asymmetric algorithms are available. Consider using the RSA class, the ECDsa class, or the ECDiffieHellman class instead of the DSA class. Use DSA only for compatibility with legacy applications and data.

This algorithm supports key lengths from 512 bits to 1024 bits in increments of 64 bits.

Constructors

DSA() DSA() DSA() DSA()

Initializes a new instance of the DSA class.

Methods

Clear() Clear() Clear() Clear()

Releases all resources used by the AsymmetricAlgorithm class.

(Inherited from AsymmetricAlgorithm)
Create() Create() Create() Create()

Creates the default cryptographic object used to perform the asymmetric algorithm.

Create(DSAParameters) Create(DSAParameters) Create(DSAParameters) Create(DSAParameters)

Creates a new ephemeral DSA key with the specified DSA key parameters.

Create(Int32) Create(Int32) Create(Int32) Create(Int32)

Creates a new ephemeral DSA key with the specified key size.

Create(String) Create(String) Create(String) Create(String)

Creates the specified cryptographic object used to perform the asymmetric algorithm.

CreateSignature(Byte[]) CreateSignature(Byte[]) CreateSignature(Byte[]) CreateSignature(Byte[])

When overridden in a derived class, creates the DSA signature for the specified data.

Dispose() Dispose() Dispose() Dispose()

Releases all resources used by the current instance of the AsymmetricAlgorithm class.

(Inherited from AsymmetricAlgorithm)
Dispose(Boolean) Dispose(Boolean) Dispose(Boolean) Dispose(Boolean)

Releases the unmanaged resources used by the AsymmetricAlgorithm class and optionally releases the managed resources.

(Inherited from AsymmetricAlgorithm)
Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determines whether the specified object is equal to the current object.

(Inherited from Object)
ExportParameters(Boolean) ExportParameters(Boolean) ExportParameters(Boolean) ExportParameters(Boolean)

When overridden in a derived class, exports the DSAParameters.

FromXmlString(String) FromXmlString(String) FromXmlString(String) FromXmlString(String)

Reconstructs a DSA object from an XML string.

GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Gets the Type of the current instance.

(Inherited from Object)
HashData(Byte[], Int32, Int32, HashAlgorithmName) HashData(Byte[], Int32, Int32, HashAlgorithmName) HashData(Byte[], Int32, Int32, HashAlgorithmName) HashData(Byte[], Int32, Int32, HashAlgorithmName)

When overridden in a derived class, computes the hash value of a specified portion of a byte array by using a specified hashing algorithm.

HashData(Stream, HashAlgorithmName) HashData(Stream, HashAlgorithmName) HashData(Stream, HashAlgorithmName) HashData(Stream, HashAlgorithmName)

When overridden in a derived class, computes the hash value of a specified binary stream by using a specified hashing algorithm.

ImportParameters(DSAParameters) ImportParameters(DSAParameters) ImportParameters(DSAParameters) ImportParameters(DSAParameters)

When overridden in a derived class, imports the specified DSAParameters.

MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
SignData(Byte[], HashAlgorithmName) SignData(Byte[], HashAlgorithmName) SignData(Byte[], HashAlgorithmName) SignData(Byte[], HashAlgorithmName)

Computes the hash value of the specified byte array using the specified hash algorithm and signs the resulting hash value.

SignData(Byte[], Int32, Int32, HashAlgorithmName) SignData(Byte[], Int32, Int32, HashAlgorithmName) SignData(Byte[], Int32, Int32, HashAlgorithmName) SignData(Byte[], Int32, Int32, HashAlgorithmName)

Computes the hash value of a portion of the specified byte array using the specified hash algorithm and signs the resulting hash value.

SignData(Stream, HashAlgorithmName) SignData(Stream, HashAlgorithmName) SignData(Stream, HashAlgorithmName) SignData(Stream, HashAlgorithmName)

Computes the hash value of the specified stream using the specified hash algorithm and signs the resulting hash value.

ToString() ToString() ToString() ToString()

Returns a string that represents the current object.

(Inherited from Object)
ToXmlString(Boolean) ToXmlString(Boolean) ToXmlString(Boolean) ToXmlString(Boolean)

Creates and returns an XML string representation of the current DSA object.

TryCreateSignature(ReadOnlySpan<Byte>, Span<Byte>, Int32) TryCreateSignature(ReadOnlySpan<Byte>, Span<Byte>, Int32) TryCreateSignature(ReadOnlySpan<Byte>, Span<Byte>, Int32) TryCreateSignature(ReadOnlySpan<Byte>, Span<Byte>, Int32)
TryHashData(ReadOnlySpan<Byte>, Span<Byte>, HashAlgorithmName, Int32) TryHashData(ReadOnlySpan<Byte>, Span<Byte>, HashAlgorithmName, Int32) TryHashData(ReadOnlySpan<Byte>, Span<Byte>, HashAlgorithmName, Int32) TryHashData(ReadOnlySpan<Byte>, Span<Byte>, HashAlgorithmName, Int32)
TrySignData(ReadOnlySpan<Byte>, Span<Byte>, HashAlgorithmName, Int32) TrySignData(ReadOnlySpan<Byte>, Span<Byte>, HashAlgorithmName, Int32) TrySignData(ReadOnlySpan<Byte>, Span<Byte>, HashAlgorithmName, Int32) TrySignData(ReadOnlySpan<Byte>, Span<Byte>, HashAlgorithmName, Int32)
VerifyData(Byte[], Byte[], HashAlgorithmName) VerifyData(Byte[], Byte[], HashAlgorithmName) VerifyData(Byte[], Byte[], HashAlgorithmName) VerifyData(Byte[], Byte[], HashAlgorithmName)

Verifies that a digital signature is valid by calculating the hash value of the specified data using the specified hash algorithm and comparing it to the provided signature.

VerifyData(Byte[], Int32, Int32, Byte[], HashAlgorithmName) VerifyData(Byte[], Int32, Int32, Byte[], HashAlgorithmName) VerifyData(Byte[], Int32, Int32, Byte[], HashAlgorithmName) VerifyData(Byte[], Int32, Int32, Byte[], HashAlgorithmName)

Verifies that a digital signature is valid by calculating the hash value of the data in a portion of a byte array using the specified hash algorithm and comparing it to the provided signature.

VerifyData(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, HashAlgorithmName) VerifyData(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, HashAlgorithmName) VerifyData(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, HashAlgorithmName) VerifyData(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, HashAlgorithmName)
VerifyData(Stream, Byte[], HashAlgorithmName) VerifyData(Stream, Byte[], HashAlgorithmName) VerifyData(Stream, Byte[], HashAlgorithmName) VerifyData(Stream, Byte[], HashAlgorithmName)

Verifies that a digital signature is valid by calculating the hash value of the specified stream using the specified hash algorithm and comparing it to the provided signature.

VerifySignature(Byte[], Byte[]) VerifySignature(Byte[], Byte[]) VerifySignature(Byte[], Byte[]) VerifySignature(Byte[], Byte[])

When overridden in a derived class, verifies the DSA signature for the specified data.

VerifySignature(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>) VerifySignature(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>) VerifySignature(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>) VerifySignature(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>)

Properties

KeyExchangeAlgorithm KeyExchangeAlgorithm KeyExchangeAlgorithm KeyExchangeAlgorithm

When overridden in a derived class, gets the name of the key exchange algorithm. Otherwise, throws an NotImplementedException.

(Inherited from AsymmetricAlgorithm)
KeySize KeySize KeySize KeySize

Gets or sets the size, in bits, of the key modulus used by the asymmetric algorithm.

(Inherited from AsymmetricAlgorithm)
LegalKeySizes LegalKeySizes LegalKeySizes LegalKeySizes

Gets the key sizes that are supported by the asymmetric algorithm.

(Inherited from AsymmetricAlgorithm)
SignatureAlgorithm SignatureAlgorithm SignatureAlgorithm SignatureAlgorithm

When implemented in a derived class, gets the name of the signature algorithm. Otherwise, always throws a NotImplementedException.

(Inherited from AsymmetricAlgorithm)

Fields

KeySizeValue KeySizeValue KeySizeValue KeySizeValue

Represents the size, in bits, of the key modulus used by the asymmetric algorithm.

(Inherited from AsymmetricAlgorithm)
LegalKeySizesValue LegalKeySizesValue LegalKeySizesValue LegalKeySizesValue

Specifies the key sizes that are supported by the asymmetric algorithm.

(Inherited from AsymmetricAlgorithm)

Explicit Interface Implementations

IDisposable.Dispose() IDisposable.Dispose() IDisposable.Dispose() IDisposable.Dispose() Inherited from AsymmetricAlgorithm

Applies to