Namespace DRIT.Mail.Rfc.Crypto.Cms

Classes

AlgorithmIdentifier

A CMS AlgorithmIdentifier (RFC 5652 §10.1). Contains an algorithm OID and optional parameters (raw DER bytes).

CmsAttribute

A CMS authenticated/enveloped attribute (RFC 5652 §5.3). An attribute is an OID with one or more DER-encoded values.

CmsException

Thrown when a CMS structure cannot be parsed or created.

CmsOids

CMS content type and algorithm OIDs (RFC 5652, RFC 3370, RFC 3565).

CmsReader

Reads CMS structures from DER-encoded bytes (RFC 5652). Parses ContentInfo, SignedData, and EnvelopedData.

CmsWriter

Writes CMS structures to DER-encoded bytes (RFC 5652). Serializes SignedData and EnvelopedData. SET OF elements are sorted per DER requirements.

ContentInfo

A CMS ContentInfo envelope (RFC 5652 §3). Wraps a typed content structure.

EncapsulatedContentInfo

A CMS EncapsulatedContentInfo (RFC 5652 §5.2). For detached signatures, the

Content is null.

EncryptedContentInfo

A CMS EncryptedContentInfo (RFC 5652 §6.1). Contains the content type, the content-encryption algorithm, and the encrypted content.

EnvelopedData

A CMS EnvelopedData structure (RFC 5652 §6). Contains the recipient information and the encrypted content info.

RecipientInfo

A CMS RecipientInfo (RFC 5652 §6.2). Only KeyTransport (RSA) is fully supported; other types are parsed minimally.

SignedData

A CMS SignedData structure (RFC 5652 §5). Contains the digest algorithms, encapsulated content, certificates, and signer information.

SignerIdentifier

Identifies a signer or recipient in a CMS structure (RFC 5652 §5.2, §6.2). Either by IssuerAndSerialNumber or by SubjectKeyIdentifier.

SignerInfo

A CMS SignerInfo (RFC 5652 §5.3). Contains the signer identifier, digest and signature algorithms, signed and unsigned attributes, and the signature value.