RSA.TrySignHash Method

Definition

Namespace:

System.Security.Cryptography

Assemblies:

netstandard.dll, System.Security.Cryptography.dll

Source:

RSA.cs

Attempts to sign the hash with the current key, writing the signature into a provided buffer.

C#

public virtual bool TrySignHash(ReadOnlySpan<byte> hash, Span<byte> destination, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.RSASignaturePadding padding, out int bytesWritten);

Parameters

hash

ReadOnlySpan<Byte>

The hash value of the data to be signed.

destination

Span<Byte>

The buffer to receive the RSA signature.

hashAlgorithm

HashAlgorithmName

The hash algorithm used to create the hash value of the data.

padding

RSASignaturePadding

The padding.

bytesWritten

Int32

When this method returns, the total number of bytes written into destination. This parameter is treated as uninitialized.

Returns

Boolean

true if destination is long enough to receive the RSA signature; otherwise, false.

Exceptions

ArgumentNullException

padding is null.

ArgumentException

hashAlgorithm.Name is null or Empty.

CryptographicException

padding is unknown, or not supported by this implementation.

-or-

This instance represents only a public key.

-or-

An error occurred creating the signature.

Remarks

The default implementation of this method calls SignHash(Byte[], HashAlgorithmName, RSASignaturePadding) and copies the result to destination. Derived types should override this method to avoid the intermediate array creation.

The RSA signature algorithm will always produce an output equal to the number of bytes required for KeySize bits.

Applies to

See also

• SignHash(Byte[], HashAlgorithmName, RSASignaturePadding)
• TrySignData(ReadOnlySpan<Byte>, Span<Byte>, HashAlgorithmName, RSASignaturePadding, Int32)