libnixstore: drop unused convert_hash function

libnixstore/include/nix.h

@@ -9,7 +9,6 @@ bool is_valid_path(rust::Str path);
 rust::String query_path_hash(rust::Str path);
 InternalPathInfo query_path_info(rust::Str path, bool base32);
 rust::String query_path_from_hash_part(rust::Str hash_part);
-rust::String convert_hash(rust::Str algo, rust::Str s, bool to_base_32);
 rust::String sign_string(rust::Str secret_key, rust::Str msg);
 rust::Vec<unsigned char>
 sign_detached(rust::Slice<const unsigned char> secret_key, rust::Str msg);

libnixstore/src/lib.rs

@@ -29,7 +29,6 @@ mod ffi {
         fn query_path_hash(path: &str) -> Result<String>;
         fn query_path_info(path: &str, base32: bool) -> Result<InternalPathInfo>;
         fn query_path_from_hash_part(hash_part: &str) -> Result<String>;
-        fn convert_hash(algo: &str, s: &str, to_base_32: bool) -> Result<String>;
         fn sign_detached(secret_key: &[u8], msg: &str) -> Vec<u8>;
         fn get_store_dir() -> String;
         fn get_real_store_dir() -> String;
@@ -151,14 +150,6 @@ pub fn query_path_from_hash_part(hash_part: &str) -> Option<String> {
     }
 }
 
-#[inline]
-/// Parse the hash from a string representation in the format `[<type>:]<base16|base32|base64>` or
-/// `<type>-<base64>` to a string representation of the hash, in `base-16`, `base-32`. The result
-/// is not prefixed by the hash type.
-pub fn convert_hash(algo: &str, s: &str, to_radix: Radix) -> Result<String, cxx::Exception> {
-    ffi::convert_hash(algo, s, matches!(to_radix, Radix::Base32))
-}
-
 #[inline]
 /// Return a detached signature of the given string.
 pub fn sign_detached(secret_key: &[u8], msg: &str) -> Vec<u8> {