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public ref class DSA abstract : System::Security::Cryptography::AsymmetricAlgorithm

[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public abstract class DSA : System.Security.Cryptography.AsymmetricAlgorithm

public abstract class DSA : System.Security.Cryptography.AsymmetricAlgorithm

[System.Runtime.InteropServices.ComVisible(true)]
public abstract class DSA : System.Security.Cryptography.AsymmetricAlgorithm

[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
type DSA = class
    inherit AsymmetricAlgorithm

type DSA = class
    inherit AsymmetricAlgorithm

[<System.Runtime.InteropServices.ComVisible(true)>]
type DSA = class
    inherit AsymmetricAlgorithm

Public MustInherit Class DSA
Inherits AsymmetricAlgorithm

Inheritance

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.

Important

The creators of the DSA algorithm have withdrawn their support for it. Consider using the RSA class or the ECDsa class instead of the DSA class. Use DSA only for compatibility with legacy applications and data.

Two different versions of the DSA algorithm exist. The original form, described in FIPS 186-2, requires the use of SHA-1 as the hash algorithm and supports key lengths from 512 bits to 1024 bits in increments of 64 bits. An updated version of the algorithm was described in FIPS 186-3, which enabled the use of the SHA-2 family of hash algorithms and added support for 2048 bit keys and 3072 bit keys. Not all derived implementations of this type support the FIPS 186-3 enhancements to DSA. Support can be detected via the LegalKeySizes property.

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

(Inherited from AsymmetricAlgorithm )

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

(Inherited from AsymmetricAlgorithm )

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

(Inherited from AsymmetricAlgorithm )

Exports the current key in the PKCS#8 EncryptedPrivateKeyInfo format with a byte-based password.

(Inherited from AsymmetricAlgorithm )

Exports the current key in the PKCS#8 EncryptedPrivateKeyInfo format with a char-based password.

(Inherited from AsymmetricAlgorithm )

Exports the current key in the PKCS#8 EncryptedPrivateKeyInfo format with a char-based password, PEM encoded.

(Inherited from AsymmetricAlgorithm )

Exports the public-key portion of the current key in the X.509 SubjectPublicKeyInfo format.

(Inherited from AsymmetricAlgorithm )

Exports the public-key portion of the current key in the X.509 SubjectPublicKeyInfo format, PEM encoded.

(Inherited from AsymmetricAlgorithm )

When overridden in a derived class, imports the public/private keypair from a PKCS#8 EncryptedPrivateKeyInfo structure after decrypting with a byte-based password, replacing the keys for this object.

(Inherited from AsymmetricAlgorithm )

When overridden in a derived class, imports the public/private keypair from a PKCS#8 EncryptedPrivateKeyInfo structure after decrypting with a char-based password, replacing the keys for this object.

(Inherited from AsymmetricAlgorithm )

When overridden in a derived class, imports an encrypted RFC 7468 PEM-encoded key, replacing the keys for this object.

(Inherited from AsymmetricAlgorithm )

When overridden in a derived class, imports an encrypted RFC 7468 PEM-encoded key, replacing the keys for this object.

(Inherited from AsymmetricAlgorithm )

When overridden in a derived class, imports an RFC 7468 textually encoded key, replacing the keys for this object.

(Inherited from AsymmetricAlgorithm )

When overriden in a derived class, imports the public/private keypair from a PKCS#8 PrivateKeyInfo structure after decryption, replacing the keys for this object.

(Inherited from AsymmetricAlgorithm )

When overriden in a derived class, imports the public key from an X.509 SubjectPublicKeyInfo structure after decryption, replacing the keys for this object.

(Inherited from AsymmetricAlgorithm )

When overridden in a derived class, attempts to export the current key in the PKCS#8 EncryptedPrivateKeyInfo format into a provided buffer, using a byte-based password.

(Inherited from AsymmetricAlgorithm )

When overriden in a derived class, attempts to export the current key in the PKCS#8 EncryptedPrivateKeyInfo format into a provided buffer, using a char-based password.

(Inherited from AsymmetricAlgorithm )

Exports the current key in the PKCS#8 EncryptedPrivateKeyInfo format with a char-based password, PEM encoded.

(Inherited from AsymmetricAlgorithm )

When overridden in a derived class, attempts to export the current key in the PKCS#8 PrivateKeyInfo format into a provided buffer.

(Inherited from AsymmetricAlgorithm )

Attempts to export the current key in the PEM-encoded PKCS#8 PrivateKeyInfo format into a provided buffer.

(Inherited from AsymmetricAlgorithm )

When overridden in a derived class, attempts to export the current key in the X.509 SubjectPublicKeyInfo format into a provided buffer.

(Inherited from AsymmetricAlgorithm )

Attempts to export the current key in the PEM-encoded X.509 SubjectPublicKeyInfo format into a provided buffer.

(Inherited from AsymmetricAlgorithm )

This API supports the product infrastructure and is not intended to be used directly from your code.

For a description of this member, see Dispose() .

(Inherited from AsymmetricAlgorithm )