cms: Added a test for BER-CMS (#1941)

Author: bkstein

cms/tests/cms_ber.rs

@@ -0,0 +1,37 @@
+#[cfg(test)]
+mod tests {
+    use cms::content_info::ContentInfo;
+    use der::Decode;
+    use hex_literal::hex;
+
+    #[test]
+    fn convert_indefinite_ber_ejbca_cms() {
+        // This represents the cms structure sent by EJBCA for SCEP requests.
+        #[rustfmt::skip]
+        const EXAMPLE_BER: &[u8] = &hex![
+            "30 80"                                            // ContentInfo SEQUENCE (2 elem) (indefinite length)
+                "06 09 2a 86 48 86 f7 0d 01 07 02"             //   contentType ContentType OBJECT IDENTIFIER
+                "a0 80"                                        //   content [0] ANY (1 elem) (indefinite length)
+                    "30 80"                                    //     SignedData SEQUENCE (5 elem) (indefinite length)
+                        "02 01 01"                             //       version CMSVersion INTEGER 1
+                        "31 00"                                //       digestAlgorithms DigestAlgorithmIdentifiers SET (0 elem)
+                        "30 0b"                                //       encapContentInfo EncapsulatedContentInfo SEQUENCE (1 elem)
+                            "06 09 2a 86 48 86 f7 0d 01 07 01" //         eContentType ContentType OBJECT IDENTIFIER
+                        "a0 80"                                //       CertificateSet ANY (2 elem) (indefinite length)
+                            "30 06"                            //         CertificateChoices SEQUENCE (3 elem)
+                                "30 00"
+                                "30 00"
+                                "30 00"
+                            "30 06"                            //         CertificateChoices SEQUENCE (3 elem)
+                                "30 00"
+                                "30 00"
+                                "30 00"
+                        "00 00"
+                        "31 00"                                //       signerInfos SignerInfos SET (0 elem)
+                    "00 00"
+                "00 00"
+            "00 00"
+        ];
+        assert!(ContentInfo::from_ber(EXAMPLE_BER).is_ok());
+    }
+}