PKCS#7: Implement a parser [RFC 2315]
Implement a parser for a PKCS#7 signed-data message as described in part of
RFC 2315.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
diff --git a/crypto/asymmetric_keys/pkcs7.asn1 b/crypto/asymmetric_keys/pkcs7.asn1
new file mode 100644
index 0000000..a5a14ef
--- /dev/null
+++ b/crypto/asymmetric_keys/pkcs7.asn1
@@ -0,0 +1,127 @@
+PKCS7ContentInfo ::= SEQUENCE {
+ contentType ContentType,
+ content [0] EXPLICIT SignedData OPTIONAL
+}
+
+ContentType ::= OBJECT IDENTIFIER ({ pkcs7_note_OID })
+
+SignedData ::= SEQUENCE {
+ version INTEGER,
+ digestAlgorithms DigestAlgorithmIdentifiers,
+ contentInfo ContentInfo,
+ certificates CHOICE {
+ certSet [0] IMPLICIT ExtendedCertificatesAndCertificates,
+ certSequence [2] IMPLICIT Certificates
+ } OPTIONAL ({ pkcs7_note_certificate_list }),
+ crls CHOICE {
+ crlSet [1] IMPLICIT CertificateRevocationLists,
+ crlSequence [3] IMPLICIT CRLSequence
+ } OPTIONAL,
+ signerInfos SignerInfos
+}
+
+ContentInfo ::= SEQUENCE {
+ contentType ContentType,
+ content [0] EXPLICIT Data OPTIONAL
+}
+
+Data ::= ANY ({ pkcs7_note_data })
+
+DigestAlgorithmIdentifiers ::= CHOICE {
+ daSet SET OF DigestAlgorithmIdentifier,
+ daSequence SEQUENCE OF DigestAlgorithmIdentifier
+}
+
+DigestAlgorithmIdentifier ::= SEQUENCE {
+ algorithm OBJECT IDENTIFIER ({ pkcs7_note_OID }),
+ parameters ANY OPTIONAL
+}
+
+--
+-- Certificates and certificate lists
+--
+ExtendedCertificatesAndCertificates ::= SET OF ExtendedCertificateOrCertificate
+
+ExtendedCertificateOrCertificate ::= CHOICE {
+ certificate Certificate, -- X.509
+ extendedCertificate [0] IMPLICIT ExtendedCertificate -- PKCS#6
+}
+
+ExtendedCertificate ::= Certificate -- cheating
+
+Certificates ::= SEQUENCE OF Certificate
+
+CertificateRevocationLists ::= SET OF CertificateList
+
+CertificateList ::= SEQUENCE OF Certificate -- This may be defined incorrectly
+
+CRLSequence ::= SEQUENCE OF CertificateList
+
+Certificate ::= ANY ({ pkcs7_extract_cert }) -- X.509
+
+--
+-- Signer information
+--
+SignerInfos ::= CHOICE {
+ siSet SET OF SignerInfo,
+ siSequence SEQUENCE OF SignerInfo
+}
+
+SignerInfo ::= SEQUENCE {
+ version INTEGER,
+ issuerAndSerialNumber IssuerAndSerialNumber,
+ digestAlgorithm DigestAlgorithmIdentifier ({ pkcs7_sig_note_digest_algo }),
+ authenticatedAttributes CHOICE {
+ aaSet [0] IMPLICIT SetOfAuthenticatedAttribute
+ ({ pkcs7_sig_note_set_of_authattrs }),
+ aaSequence [2] EXPLICIT SEQUENCE OF AuthenticatedAttribute
+ -- Explicit because easier to compute digest on
+ -- sequence of attributes and then reuse encoded
+ -- sequence in aaSequence.
+ } OPTIONAL,
+ digestEncryptionAlgorithm
+ DigestEncryptionAlgorithmIdentifier ({ pkcs7_sig_note_pkey_algo }),
+ encryptedDigest EncryptedDigest,
+ unauthenticatedAttributes CHOICE {
+ uaSet [1] IMPLICIT SET OF UnauthenticatedAttribute,
+ uaSequence [3] IMPLICIT SEQUENCE OF UnauthenticatedAttribute
+ } OPTIONAL
+} ({ pkcs7_note_signed_info })
+
+IssuerAndSerialNumber ::= SEQUENCE {
+ issuer Name ({ pkcs7_sig_note_issuer }),
+ serialNumber CertificateSerialNumber ({ pkcs7_sig_note_serial })
+}
+
+CertificateSerialNumber ::= INTEGER
+
+SetOfAuthenticatedAttribute ::= SET OF AuthenticatedAttribute
+
+AuthenticatedAttribute ::= SEQUENCE {
+ type OBJECT IDENTIFIER ({ pkcs7_note_OID }),
+ values SET OF ANY ({ pkcs7_sig_note_authenticated_attr })
+}
+
+UnauthenticatedAttribute ::= SEQUENCE {
+ type OBJECT IDENTIFIER ({ pkcs7_note_OID }),
+ values SET OF ANY
+}
+
+DigestEncryptionAlgorithmIdentifier ::= SEQUENCE {
+ algorithm OBJECT IDENTIFIER ({ pkcs7_note_OID }),
+ parameters ANY OPTIONAL
+}
+
+EncryptedDigest ::= OCTET STRING ({ pkcs7_sig_note_signature })
+
+---
+--- X.500 Name
+---
+Name ::= SEQUENCE OF RelativeDistinguishedName
+
+RelativeDistinguishedName ::= SET OF AttributeValueAssertion
+
+AttributeValueAssertion ::= SEQUENCE {
+ attributeType OBJECT IDENTIFIER ({ pkcs7_note_OID }),
+ attributeValue ANY
+}