Class CpPublicKey

Represents the public key of a certificate.

Inheritance

object

CpPublicKey

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: CryptoPro.Security.Cryptography.X509Certificates

Assembly: CryptoPro.Security.Cryptography.dll

Syntax

public sealed class CpPublicKey

Constructors

CpPublicKey(AsymmetricAlgorithm)

Initializes a new instance of the PublicKey class using SubjectPublicKeyInfo from an AsymmetricAlgorithm.

Declaration

public CpPublicKey(AsymmetricAlgorithm key)

Parameters

Type	Name	Description
AsymmetricAlgorithm	key	An asymmetric algorithm to obtain the SubjectPublicKeyInfo from.

Exceptions

Type	Condition
CryptographicException	The SubjectPublicKeyInfo could not be decoded. The ExportSubjectPublicKeyInfo() must return a valid ASN.1-DER encoded X.509 SubjectPublicKeyInfo.
NotImplementedException	ExportSubjectPublicKeyInfo() has not been overridden in a derived class.

CpPublicKey(Oid, CpAsnEncodedData, CpAsnEncodedData)

Declaration

public CpPublicKey(Oid oid, CpAsnEncodedData parameters, CpAsnEncodedData keyValue)

Parameters

Type	Name	Description
Oid	oid
CpAsnEncodedData	parameters
CpAsnEncodedData	keyValue

Properties

EncodedKeyValue

Declaration

public CpAsnEncodedData EncodedKeyValue { get; }

Property Value

Type	Description
CpAsnEncodedData

EncodedParameters

Declaration

public CpAsnEncodedData EncodedParameters { get; }

Property Value

Type	Description
CpAsnEncodedData

Key

Declaration

public AsymmetricAlgorithm Key { get; }

Property Value

Type	Description
AsymmetricAlgorithm

Oid

Declaration

public Oid Oid { get; }

Property Value

Type	Description
Oid

Methods

CreateFromSubjectPublicKeyInfo(ReadOnlySpan<byte>, out int)

Creates a new instance of PublicKey from a X.509 SubjectPublicKeyInfo.

Declaration

public static CpPublicKey CreateFromSubjectPublicKeyInfo(ReadOnlySpan<byte> source, out int bytesRead)

Parameters

Type	Name	Description
ReadOnlySpan<byte>	source	The bytes of an X.509 SubjectPublicKeyInfo structure in the ASN.1-DER encoding.
int	bytesRead	When this method returns, contains a value that indicates the number of bytes read from source. This parameter is treated as uninitialized.

Returns

Type	Description
CpPublicKey	A public key representing the SubjectPublicKeyInfo.

Exceptions

Type	Condition
CryptographicException	The SubjectPublicKeyInfo could not be decoded.

ExportSubjectPublicKeyInfo()

Exports the current key in the X.509 SubjectPublicKeyInfo format.

Declaration

public byte[] ExportSubjectPublicKeyInfo()

Returns

Type	Description
byte[]	A byte array containing the X.509 SubjectPublicKeyInfo representation of this key.

GetDSAPublicKey()

Gets the DSA public key, or null if the key is not an DSA key.

Declaration

public DSA? GetDSAPublicKey()

Returns

Type	Description
DSA	The public key, or null if the key is not an DSA key.

Exceptions

Type	Condition
CryptographicException	The key contents are corrupt or could not be read successfully.

GetECDiffieHellmanPublicKey()

Gets the ECDiffieHellman public key, or null if the key is not an ECDiffieHellman key.

Declaration

public ECDiffieHellman? GetECDiffieHellmanPublicKey()

Returns

Type	Description
ECDiffieHellman	The public key, or null if the key is not an ECDiffieHellman key.

Exceptions

Type	Condition
CryptographicException	The key contents are corrupt or could not be read successfully.

GetECDsaPublicKey()

Gets the ECDsa public key, or null if the key is not an ECDsa key.

Declaration

public ECDsa? GetECDsaPublicKey()

Returns

Type	Description
ECDsa	The public key, or null if the key is not an ECDsa key.

Exceptions

Type	Condition
CryptographicException	The key contents are corrupt or could not be read successfully.

GetRSAPublicKey()

Gets the RSA public key, or null if the key is not an RSA key.

Declaration

public CpRSA? GetRSAPublicKey()

Returns

Type	Description
CpRSA	The public key, or null if the key is not an RSA key.

Exceptions

Type	Condition
CryptographicException	The key contents are corrupt or could not be read successfully.

TryExportSubjectPublicKeyInfo(Span<byte>, out int)

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

Declaration

public bool TryExportSubjectPublicKeyInfo(Span<byte> destination, out int bytesWritten)

Parameters

Type	Name	Description
Span<byte>	destination	The byte span to receive the X.509 SubjectPublicKeyInfo data.
int	bytesWritten	When this method returns, contains a value that indicates the number of bytes written to destination. This parameter is treated as uninitialized.

Returns

Type	Description
bool	true if destination is big enough to receive the output; otherwise, false.