Split implementation in other modules.

rust/src/cms.rs

@@ -0,0 +1,64 @@
+use crate::certificate;
+use crate::common;
+use crate::csr;
+use crate::name;
+
+// IssuerAndSerialNumber ::= SEQUENCE {
+//     issuer Name,
+//     serialNumber CertificateSerialNumber }
+
+#[derive(asn1::Asn1Write, asn1::Asn1Read)]
+pub struct IssuerAndSerialNumber<'a> {
+    pub issuer: name::Name<'a>,
+    pub serial_number: asn1::BigInt<'a>,
+}
+
+// https://datatracker.ietf.org/doc/html/rfc5652#section-5.3
+// SignerInfo ::= SEQUENCE {
+//     version CMSVersion,
+//     sid SignerIdentifier,
+//     digestAlgorithm DigestAlgorithmIdentifier,
+//     signedAttrs [0] IMPLICIT SignedAttributes OPTIONAL,
+//     signatureAlgorithm SignatureAlgorithmIdentifier,
+//     signature SignatureValue,
+//     unsignedAttrs [1] IMPLICIT UnsignedAttributes OPTIONAL }
+
+#[derive(asn1::Asn1Write, asn1::Asn1Read)]
+pub struct SignerInfo<'a> {
+    pub version: u8,
+    // Of note, this is not exactly the standard here because we are not implementing
+    // the SignerIdentifier CHOICE.
+    pub issuer_and_serial_number: IssuerAndSerialNumber<'a>,
+    pub digest_algorithm: common::AlgorithmIdentifier<'a>,
+    #[implicit(0)]
+    pub authenticated_attributes: Option<csr::Attributes<'a>>,
+
+    pub digest_encryption_algorithm: common::AlgorithmIdentifier<'a>,
+    pub encrypted_digest: &'a [u8],
+
+    #[implicit(1)]
+    pub unauthenticated_attributes: Option<csr::Attributes<'a>>,
+}
+
+#[derive(asn1::Asn1Read, asn1::Asn1Write)]
+pub(crate) struct SignedData<'a> {
+    pub version: u8,
+    pub digest_algorithms: asn1::SetOf<'a, common::AlgorithmIdentifier<'a>>,
+    pub content_info: ContentInfo<'a>,
+    #[implicit(0)]
+    pub certificates: Option<asn1::SetOf<'a, certificate::CertificateChoices<'a>>>,
+
+    // We don't ever supply any of these, so for now, don't fill out the fields.
+    #[implicit(1)]
+    pub crls: Option<asn1::Sequence<'a>>,
+
+    pub signer_infos: asn1::SetOf<'a, SignerInfo<'a>>,
+}
+
+#[derive(asn1::Asn1Read, asn1::Asn1Write)]
+pub(crate) struct ContentInfo<'a> {
+    pub content_type: asn1::ObjectIdentifier,
+
+    #[explicit(0)]
+    pub content: Option<&'a [u8]>,
+}