diff --git a/signlib/libuniffi_hublib.so b/signlib/libuniffi_hublib.so
index 372664b..eb78fb0 100644
Binary files a/signlib/libuniffi_hublib.so and b/signlib/libuniffi_hublib.so differ
diff --git a/signlib/safe_checker.py b/signlib/safe_checker.py
index 7fac37a..9058027 100644
--- a/signlib/safe_checker.py
+++ b/signlib/safe_checker.py
@@ -460,9 +460,9 @@ def _uniffi_check_contract_api_version(lib):
         raise InternalError("UniFFI contract version mismatch: try cleaning and rebuilding your project")
 
 def _uniffi_check_api_checksums(lib):
-    if lib.uniffi_hublib_checksum_func_get_secret_value() != 7762:
+    if lib.uniffi_hublib_checksum_func_get_secret_value() != 58838:
         raise InternalError("UniFFI API checksum mismatch: try cleaning and rebuilding your project")
-    if lib.uniffi_hublib_checksum_func_recreate_secret_value() != 51310:
+    if lib.uniffi_hublib_checksum_func_recreate_secret_value() != 37521:
         raise InternalError("UniFFI API checksum mismatch: try cleaning and rebuilding your project")
 
 # A ctypes library to expose the extern-C FFI definitions.
@@ -571,14 +571,14 @@ class _UniffiForeignFutureStructVoid(ctypes.Structure):
 _UNIFFI_FOREIGN_FUTURE_COMPLETE_VOID = ctypes.CFUNCTYPE(None,ctypes.c_uint64,_UniffiForeignFutureStructVoid,
 )
 _UniffiLib.uniffi_hublib_fn_func_get_secret_value.argtypes = (
-    ctypes.c_uint64,
+    _UniffiRustBuffer,
     _UniffiRustBuffer,
     _UniffiRustBuffer,
     ctypes.POINTER(_UniffiRustCallStatus),
 )
 _UniffiLib.uniffi_hublib_fn_func_get_secret_value.restype = _UniffiRustBuffer
 _UniffiLib.uniffi_hublib_fn_func_recreate_secret_value.argtypes = (
-    ctypes.c_uint64,
+    _UniffiRustBuffer,
     _UniffiRustBuffer,
     _UniffiRustBuffer,
     _UniffiRustBuffer,
@@ -869,19 +869,6 @@ _uniffi_check_contract_api_version(_UniffiLib)
 # Public interface members begin here.
 
 
-class _UniffiConverterUInt64(_UniffiConverterPrimitiveInt):
-    CLASS_NAME = "u64"
-    VALUE_MIN = 0
-    VALUE_MAX = 2**64
-
-    @staticmethod
-    def read(buf):
-        return buf.read_u64()
-
-    @staticmethod
-    def write(value, buf):
-        buf.write_u64(value)
-
 class _UniffiConverterString:
     @staticmethod
     def check_lower(value):
@@ -916,21 +903,21 @@ class _UniffiConverterString:
 
 # Async support
 
-def get_secret_value(cur_time: "int",user_agent: "str",url: "str") -> "str":
-    _UniffiConverterUInt64.check_lower(cur_time)
+def get_secret_value(http_date: "str",user_agent: "str",url: "str") -> "str":
+    _UniffiConverterString.check_lower(http_date)
     
     _UniffiConverterString.check_lower(user_agent)
     
     _UniffiConverterString.check_lower(url)
     
     return _UniffiConverterString.lift(_uniffi_rust_call(_UniffiLib.uniffi_hublib_fn_func_get_secret_value,
-        _UniffiConverterUInt64.lower(cur_time),
+        _UniffiConverterString.lower(http_date),
         _UniffiConverterString.lower(user_agent),
         _UniffiConverterString.lower(url)))
 
 
-def recreate_secret_value(cur_time: "int",user_agent: "str",url: "str",gotten_value: "str") -> "str":
-    _UniffiConverterUInt64.check_lower(cur_time)
+def recreate_secret_value(http_date: "str",user_agent: "str",url: "str",gotten_value: "str") -> "str":
+    _UniffiConverterString.check_lower(http_date)
     
     _UniffiConverterString.check_lower(user_agent)
     
@@ -939,7 +926,7 @@ def recreate_secret_value(cur_time: "int",user_agent: "str",url: "str",gotten_va
     _UniffiConverterString.check_lower(gotten_value)
     
     return _UniffiConverterString.lift(_uniffi_rust_call(_UniffiLib.uniffi_hublib_fn_func_recreate_secret_value,
-        _UniffiConverterUInt64.lower(cur_time),
+        _UniffiConverterString.lower(http_date),
         _UniffiConverterString.lower(user_agent),
         _UniffiConverterString.lower(url),
         _UniffiConverterString.lower(gotten_value)))