pkcs7: remove crate sources

The `pkcs7` crate has been deprecated in favor of the `cms` crate:

https://github.com/RustCrypto/formats/tree/master/cms

This commit leaves behind a README.md with information about the
deprecation.

Cargo.toml

@@ -14,7 +14,6 @@ members = [
     "pem-rfc7468",
     "pkcs1",
     "pkcs5",
-    "pkcs7",
     "pkcs8",
     "pkcs12",
     "sec1",
@@ -48,7 +47,6 @@ der_derive        = { path = "./der/derive" }
 pem-rfc7468       = { path = "./pem-rfc7468" }
 pkcs1             = { path = "./pkcs1" }
 pkcs5             = { path = "./pkcs5" }
-pkcs7             = { path = "./pkcs7" }
 pkcs8             = { path = "./pkcs8" }
 pkcs12            = { path = "./pkcs12" }
 sec1              = { path = "./sec1" }

cms/tests/tests_from_pkcs7_crate.rs

@@ -9,7 +9,7 @@ use pkcs5::pbes2::Pbkdf2Params;
 
 #[test]
 fn cms_decode_cert_example() {
-    let enc_ci = include_bytes!("../../pkcs7/tests/examples/certData.bin");
+    let enc_ci = include_bytes!("../tests/examples/certData.bin");
     let ci = ContentInfo::from_der(enc_ci).unwrap();
     assert_eq!(ci.content_type, const_oid::db::rfc5911::ID_DATA);
     assert_eq!(ci.content.value().len(), 781);
@@ -19,7 +19,7 @@ fn cms_decode_cert_example() {
 
 #[test]
 fn cms_decode_encrypted_key_example() {
-    let enc_ci = include_bytes!("../../pkcs7/tests/examples/keyEncryptedData.bin");
+    let enc_ci = include_bytes!("../tests/examples/keyEncryptedData.bin");
     let ci = ContentInfo::from_der(enc_ci).unwrap();
     assert_eq!(ci.content_type, const_oid::db::rfc5911::ID_ENCRYPTED_DATA);
     let data = EncryptedData::from_der(ci.content.to_der().unwrap().as_slice()).unwrap();
@@ -54,8 +54,7 @@ fn cms_decode_encrypted_key_example() {
 
 #[test]
 fn cms_decode_signed_mdm_example() {
-    let der_signed_data_in_ci =
-        include_bytes!("../../pkcs7/tests/examples/apple_mdm_signature_der.bin");
+    let der_signed_data_in_ci = include_bytes!("../tests/examples/apple_mdm_signature_der.bin");
     let ci = ContentInfo::from_der(der_signed_data_in_ci).unwrap();
     assert_eq!(ci.content_type, const_oid::db::rfc5911::ID_SIGNED_DATA);
 
@@ -81,7 +80,7 @@ fn cms_decode_signed_mdm_example() {
 
 #[test]
 fn cms_decode_signed_scep_example() {
-    let der_signed_data_in_ci = include_bytes!("../../pkcs7/tests/examples/scep_der.bin");
+    let der_signed_data_in_ci = include_bytes!("../tests/examples/scep_der.bin");
     let ci = ContentInfo::from_der(der_signed_data_in_ci).unwrap();
     assert_eq!(ci.content_type, const_oid::db::rfc5911::ID_SIGNED_DATA);
 
@@ -108,7 +107,7 @@ fn cms_decode_signed_scep_example() {
 
 #[test]
 fn cms_decode_signed_der() {
-    let der_signed_data_in_ci = include_bytes!("../../pkcs7/tests/examples/cms_der.bin");
+    let der_signed_data_in_ci = include_bytes!("../tests/examples/cms_der.bin");
     let ci = ContentInfo::from_der(der_signed_data_in_ci).unwrap();
     assert_eq!(ci.content_type, const_oid::db::rfc5911::ID_SIGNED_DATA);