Class CmsAttribute

Namespace

SimpleSign.Core.Crypto

Assembly

SimpleSign.Core.dll

Represents a pre-encoded CMS signed attribute (OID + DER value). Used to inject custom CAdES attributes into the CMS SignedData.

public sealed class CmsAttribute

Inheritance

object

CmsAttribute

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Properties

DerValue

The DER-encoded value (the content of SET OF { value }).

public byte[] DerValue { get; }

Property Value

byte[]

Oid

The OID of the attribute.

public string Oid { get; }

Property Value

string

Methods

CommitmentTypeIndication(CommitmentType)

Creates a commitment-type-indication attribute (RFC 5126 §5.11.1).

CommitmentTypeIndication ::= SEQUENCE {
  commitmentTypeId  CommitmentTypeIdentifier }
CommitmentTypeIdentifier ::= OID

public static CmsAttribute CommitmentTypeIndication(CommitmentType type)

Parameters

type CommitmentType

Returns

CmsAttribute

Raw(string, byte[])

Creates a CmsAttribute from raw OID and DER-encoded value.

public static CmsAttribute Raw(string oid, byte[] derValue)

Parameters

oid string

derValue byte[]

Returns

CmsAttribute

SignatureManifestAttr(byte[])

Creates a signature manifest attribute containing JSON-encoded evidence. The data is embedded as an OCTET STRING (UTF-8 JSON) under OID 2.16.76.1.12.1.1.

public static CmsAttribute SignatureManifestAttr(byte[] manifestJsonUtf8)

Parameters

manifestJsonUtf8 byte[]

UTF-8 encoded JSON bytes of the manifest.

Returns

CmsAttribute

SignaturePolicyIdentifier(string, string?)

Creates a signature-policy-identifier attribute (RFC 5126 §5.8.1).

SignaturePolicyIdentifier ::= SEQUENCE {
  signaturePolicyId    SignaturePolicyId,
  sigPolicyHash        SigPolicyHash OPTIONAL }
SignaturePolicyId ::= OID
SigPolicyHash ::= OtherHashAlgAndValue (SEQUENCE { algorithm, hash })

public static CmsAttribute SignaturePolicyIdentifier(string policyOid, string? policyUri = null)

Parameters

policyOid string

OID of the signature policy.

policyUri string

Optional URI of the policy document (encoded as SigPolicyQualifier).

Returns

CmsAttribute