chore: checkpoint before Python removal

vendor/pkcs5/src/error.rs

@@ -0,0 +1,56 @@
+//! Error types
+
+use core::fmt;
+use der::asn1::ObjectIdentifier;
+
+/// Result type
+pub type Result<T> = core::result::Result<T, Error>;
+
+/// Error type
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[non_exhaustive]
+pub enum Error {
+    /// Given parameters are invalid for this algorithm
+    AlgorithmParametersInvalid {
+        /// OID for algorithm for which the parameters were invalid
+        oid: ObjectIdentifier,
+    },
+
+    /// Decryption Failed
+    DecryptFailed,
+
+    /// Encryption Failed
+    EncryptFailed,
+
+    /// Pbes1 support is limited to parsing; encryption/decryption is not supported (won't fix)
+    #[cfg(feature = "pbes2")]
+    NoPbes1CryptSupport,
+
+    /// Algorithm is not supported
+    ///
+    /// This may be due to a disabled crate feature
+    /// Or the algorithm is not supported at all.
+    UnsupportedAlgorithm {
+        /// OID of unsupported algorithm
+        oid: ObjectIdentifier,
+    },
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Error::AlgorithmParametersInvalid { oid } => {
+                write!(f, "PKCS#5 parameters for algorithm {} are invalid", oid)
+            }
+            Error::DecryptFailed => f.write_str("PKCS#5 decryption failed"),
+            Error::EncryptFailed => f.write_str("PKCS#5 encryption failed"),
+            #[cfg(feature = "pbes2")]
+            Error::NoPbes1CryptSupport => {
+                f.write_str("PKCS#5 encryption/decryption unsupported for PBES1 (won't fix)")
+            }
+            Error::UnsupportedAlgorithm { oid } => {
+                write!(f, "PKCS#5 algorithm {} is unsupported", oid)
+            }
+        }
+    }
+}