Interface IExternalSignature

Namespace

iText.Signatures

Assembly

itext.sign.dll

Interface that needs to be implemented to do the actual signing.

public interface IExternalSignature

Remarks

Interface that needs to be implemented to do the actual signing. For instance: you'll have to implement this interface if you want to sign a PDF using a smart card.

Methods

GetDigestAlgorithmName()

Returns the digest algorithm.

string GetDigestAlgorithmName()

Returns

string

The digest algorithm (e.g. "SHA-1", "SHA-256,...").

GetSignatureAlgorithmName()

Returns the signature algorithm used for signing, disregarding the digest function.

string GetSignatureAlgorithmName()

Returns

string

The signature algorithm ("RSA", "DSA", "ECDSA", "Ed25519" or "Ed448").

GetSignatureMechanismParameters()

Return the algorithm parameters that need to be encoded together with the signature mechanism identifier.

ISignatureMechanismParams GetSignatureMechanismParameters()

Returns

ISignatureMechanismParams

algorithm parameters

Remarks

Return the algorithm parameters that need to be encoded together with the signature mechanism identifier. If there are no parameters, return null. A non-null value is required for RSASSA-PSS; see RSASSAPSSMechanismParams.

Sign(byte[])

Signs the given message using the encryption algorithm in combination with the hash algorithm.

byte[] Sign(byte[] message)

Parameters

message byte[]

The message you want to be hashed and signed.

Returns

byte[]

A signed message digest.