diff --git a/scripts/mbedtls_dev/c_wrapper_generator.py b/scripts/mbedtls_dev/c_wrapper_generator.py
new file mode 100644
index 0000000..26da9b2
--- /dev/null
+++ b/scripts/mbedtls_dev/c_wrapper_generator.py
@@ -0,0 +1,459 @@
+"""Generate C wrapper functions.
+"""
+
+# Copyright The Mbed TLS Contributors
+# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+
+import os
+import re
+import sys
+import typing
+from typing import Dict, List, Optional, Tuple
+
+from .c_parsing_helper import ArgumentInfo, FunctionInfo
+from . import typing_util
+
+
+def c_declare(prefix: str, name: str, suffix: str) -> str:
+    """Format a declaration of name with the given type prefix and suffix."""
+    if not prefix.endswith('*'):
+        prefix += ' '
+    return prefix + name + suffix
+
+
+WrapperInfo = typing.NamedTuple('WrapperInfo', [
+    ('argument_names', List[str]),
+    ('guard', Optional[str]),
+    ('wrapper_name', str),
+])
+
+
+class Base:
+    """Generate a C source file containing wrapper functions."""
+
+    # This class is designed to have many methods potentially overloaded.
+    # Tell pylint not to complain about methods that have unused arguments:
+    # child classes are likely to override those methods and need the
+    # arguments in question.
+    #pylint: disable=no-self-use,unused-argument
+
+    # Prefix prepended to the function's name to form the wrapper name.
+    _WRAPPER_NAME_PREFIX = ''
+    # Suffix appended to the function's name to form the wrapper name.
+    _WRAPPER_NAME_SUFFIX = '_wrap'
+
+    # Functions with one of these qualifiers are skipped.
+    _SKIP_FUNCTION_WITH_QUALIFIERS = frozenset(['inline', 'static'])
+
+    def __init__(self):
+        """Construct a wrapper generator object.
+        """
+        self.program_name = os.path.basename(sys.argv[0])
+        # To be populated in a derived class
+        self.functions = {} #type: Dict[str, FunctionInfo]
+        # Preprocessor symbol used as a guard against multiple inclusion in the
+        # header. Must be set before writing output to a header.
+        # Not used when writing .c output.
+        self.header_guard = None #type: Optional[str]
+
+    def _write_prologue(self, out: typing_util.Writable, header: bool) -> None:
+        """Write the prologue of a C file.
+
+        This includes a description comment and some include directives.
+        """
+        out.write("""/* Automatically generated by {}, do not edit! */
+
+/* Copyright The Mbed TLS Contributors
+ * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+"""
+                  .format(self.program_name))
+        if header:
+            out.write("""
+#ifndef {guard}
+#define {guard}
+
+#ifdef __cplusplus
+extern "C" {{
+#endif
+"""
+                      .format(guard=self.header_guard))
+        out.write("""
+#include <mbedtls/build_info.h>
+""")
+
+    def _write_epilogue(self, out: typing_util.Writable, header: bool) -> None:
+        """Write the epilogue of a C file.
+        """
+        if header:
+            out.write("""
+#ifdef __cplusplus
+}}
+#endif
+
+#endif /* {guard} */
+"""
+                      .format(guard=self.header_guard))
+        out.write("""
+/* End of automatically generated file. */
+""")
+
+    def _wrapper_function_name(self, original_name: str) -> str:
+        """The name of the wrapper function.
+
+        By default, this adds a suffix.
+        """
+        return (self._WRAPPER_NAME_PREFIX +
+                original_name +
+                self._WRAPPER_NAME_SUFFIX)
+
+    def _wrapper_declaration_start(self,
+                                   function: FunctionInfo,
+                                   wrapper_name: str) -> str:
+        """The beginning of the wrapper function declaration.
+
+        This ends just before the opening parenthesis of the argument list.
+
+        This is a string containing at least the return type and the
+        function name. It may start with additional qualifiers or attributes
+        such as `static`, `__attribute__((...))`, etc.
+        """
+        return c_declare(function.return_type, wrapper_name, '')
+
+    def _argument_name(self,
+                       function_name: str,
+                       num: int,
+                       arg: ArgumentInfo) -> str:
+        """Name to use for the given argument in the wrapper function.
+
+        Argument numbers count from 0.
+        """
+        name = 'arg' + str(num)
+        if arg.name:
+            name += '_' + arg.name
+        return name
+
+    def _wrapper_declaration_argument(self,
+                                      function_name: str,
+                                      num: int, name: str,
+                                      arg: ArgumentInfo) -> str:
+        """One argument definition in the wrapper function declaration.
+
+        Argument numbers count from 0.
+        """
+        return c_declare(arg.type, name, arg.suffix)
+
+    def _underlying_function_name(self, function: FunctionInfo) -> str:
+        """The name of the underlying function.
+
+        By default, this is the name of the wrapped function.
+        """
+        return function.name
+
+    def _return_variable_name(self, function: FunctionInfo) -> str:
+        """The name of the variable that will contain the return value."""
+        return 'retval'
+
+    def _write_function_call(self, out: typing_util.Writable,
+                             function: FunctionInfo,
+                             argument_names: List[str]) -> None:
+        """Write the call to the underlying function.
+        """
+        # Note that the function name is in parentheses, to avoid calling
+        # a function-like macro with the same name, since in typical usage
+        # there is a function-like macro with the same name which is the
+        # wrapper.
+        call = '({})({})'.format(self._underlying_function_name(function),
+                                 ', '.join(argument_names))
+        if function.returns_void():
+            out.write('    {};\n'.format(call))
+        else:
+            ret_name = self._return_variable_name(function)
+            ret_decl = c_declare(function.return_type, ret_name, '')
+            out.write('    {} = {};\n'.format(ret_decl, call))
+
+    def _write_function_return(self, out: typing_util.Writable,
+                               function: FunctionInfo,
+                               if_void: bool = False) -> None:
+        """Write a return statement.
+
+        If the function returns void, only write a statement if if_void is true.
+        """
+        if function.returns_void():
+            if if_void:
+                out.write('    return;\n')
+        else:
+            ret_name = self._return_variable_name(function)
+            out.write('    return {};\n'.format(ret_name))
+
+    def _write_function_body(self, out: typing_util.Writable,
+                             function: FunctionInfo,
+                             argument_names: List[str]) -> None:
+        """Write the body of the wrapper code for the specified function.
+        """
+        self._write_function_call(out, function, argument_names)
+        self._write_function_return(out, function)
+
+    def _skip_function(self, function: FunctionInfo) -> bool:
+        """Whether to skip this function.
+
+        By default, static or inline functions are skipped.
+        """
+        if not self._SKIP_FUNCTION_WITH_QUALIFIERS.isdisjoint(function.qualifiers):
+            return True
+        return False
+
+    _FUNCTION_GUARDS = {
+    } #type: Dict[str, str]
+
+    def _function_guard(self, function: FunctionInfo) -> Optional[str]:
+        """A preprocessor condition for this function.
+
+        The wrapper will be guarded with `#if` on this condition, if not None.
+        """
+        return self._FUNCTION_GUARDS.get(function.name)
+
+    def _wrapper_info(self, function: FunctionInfo) -> Optional[WrapperInfo]:
+        """Information about the wrapper for one function.
+
+        Return None if the function should be skipped.
+        """
+        if self._skip_function(function):
+            return None
+        argument_names = [self._argument_name(function.name, num, arg)
+                          for num, arg in enumerate(function.arguments)]
+        return WrapperInfo(
+            argument_names=argument_names,
+            guard=self._function_guard(function),
+            wrapper_name=self._wrapper_function_name(function.name),
+        )
+
+    def _write_function_prototype(self, out: typing_util.Writable,
+                                  function: FunctionInfo,
+                                  wrapper: WrapperInfo,
+                                  header: bool) -> None:
+        """Write the prototype of a wrapper function.
+
+        If header is true, write a function declaration, with a semicolon at
+        the end. Otherwise just write the prototype, intended to be followed
+        by the function's body.
+        """
+        declaration_start = self._wrapper_declaration_start(function,
+                                                            wrapper.wrapper_name)
+        arg_indent = '    '
+        terminator = ';\n' if header else '\n'
+        if function.arguments:
+            out.write(declaration_start + '(\n')
+            for num in range(len(function.arguments)):
+                arg_def = self._wrapper_declaration_argument(
+                    function.name,
+                    num, wrapper.argument_names[num], function.arguments[num])
+                arg_terminator = \
+                    (')' + terminator if num == len(function.arguments) - 1 else
+                     ',\n')
+                out.write(arg_indent + arg_def + arg_terminator)
+        else:
+            out.write(declaration_start + '(void)' + terminator)
+
+    def _write_c_function(self, out: typing_util.Writable,
+                          function: FunctionInfo) -> None:
+        """Write wrapper code for one function.
+
+        Do nothing if the function is skipped.
+        """
+        wrapper = self._wrapper_info(function)
+        if wrapper is None:
+            return
+        out.write("""
+/* Wrapper for {} */
+"""
+                  .format(function.name))
+        if wrapper.guard is not None:
+            out.write('#if {}\n'.format(wrapper.guard))
+        self._write_function_prototype(out, function, wrapper, False)
+        out.write('{\n')
+        self._write_function_body(out, function, wrapper.argument_names)
+        out.write('}\n')
+        if wrapper.guard is not None:
+            out.write('#endif /* {} */\n'.format(wrapper.guard))
+
+    def _write_h_function(self, out: typing_util.Writable,
+                          function: FunctionInfo,
+                          wrapper: WrapperInfo) -> None:
+        """Write the declaration of one wrapper function.
+        """
+        out.write('\n')
+        if wrapper.guard is not None:
+            out.write('#if {}\n'.format(wrapper.guard))
+        self._write_function_prototype(out, function, wrapper, True)
+        if wrapper.guard is not None:
+            out.write('#endif /* {} */\n'.format(wrapper.guard))
+
+    def _write_h_macro(self, out: typing_util.Writable,
+                       function: FunctionInfo,
+                       wrapper: WrapperInfo) -> None:
+        """Write the macro definition for one wrapper.
+        """
+        arg_list = ', '.join(wrapper.argument_names)
+        out.write('#define {function_name}({args}) \\\n    {wrapper_name}({args})\n'
+                  .format(function_name=function.name,
+                          wrapper_name=wrapper.wrapper_name,
+                          args=arg_list))
+
+    def write_c_file(self, filename: str) -> None:
+        """Output a whole C file containing function wrapper definitions."""
+        with open(filename, 'w', encoding='utf-8') as out:
+            self._write_prologue(out, False)
+            for name in sorted(self.functions):
+                self._write_c_function(out, self.functions[name])
+            self._write_epilogue(out, False)
+
+    def _header_guard_from_file_name(self, filename: str) -> str:
+        """Preprocessor symbol used as a guard against multiple inclusion."""
+        # Heuristic to strip irrelevant leading directories
+        filename = re.sub(r'.*include[\\/]', r'', filename)
+        return re.sub(r'[^0-9A-Za-z]', r'_', filename, re.A).upper()
+
+    def write_h_file(self, filename: str) -> None:
+        """Output a header file with function wrapper declarations and macro definitions."""
+        self.header_guard = self._header_guard_from_file_name(filename)
+        with open(filename, 'w', encoding='utf-8') as out:
+            self._write_prologue(out, True)
+            for name in sorted(self.functions.keys()):
+                function = self.functions[name]
+                wrapper = self._wrapper_info(function)
+                if wrapper is None:
+                    continue
+                self._write_h_function(out, function, wrapper)
+                self._write_h_macro(out, function, wrapper)
+            self._write_epilogue(out, True)
+
+
+class UnknownTypeForPrintf(Exception):
+    """Exception raised when attempting to generate code that logs a value of an unknown type."""
+
+    def __init__(self, typ: str) -> None:
+        super().__init__("Unknown type for printf format generation: " + typ)
+
+
+class Logging(Base):
+    """Generate wrapper functions that log the inputs and outputs."""
+
+    def __init__(self) -> None:
+        """Construct a wrapper generator including logging of inputs and outputs.
+
+        Log to stdout by default. Call `set_stream` to change this.
+        """
+        super().__init__()
+        self.stream = 'stdout'
+
+    def set_stream(self, stream: str) -> None:
+        """Set the stdio stream to log to.
+
+        Call this method before calling `write_c_output` or `write_h_output`.
+        """
+        self.stream = stream
+
+    def _write_prologue(self, out: typing_util.Writable, header: bool) -> None:
+        super()._write_prologue(out, header)
+        if not header:
+            out.write("""
+#if defined(MBEDTLS_FS_IO) && defined(MBEDTLS_TEST_HOOKS)
+#include <stdio.h>
+#include <inttypes.h>
+#include <mbedtls/debug.h> // for MBEDTLS_PRINTF_SIZET
+#include <mbedtls/platform.h> // for mbedtls_fprintf
+#endif /* defined(MBEDTLS_FS_IO) && defined(MBEDTLS_TEST_HOOKS) */
+""")
+
+    _PRINTF_SIMPLE_FORMAT = {
+        'int': '%d',
+        'long': '%ld',
+        'long long': '%lld',
+        'size_t': '%"MBEDTLS_PRINTF_SIZET"',
+        'unsigned': '0x%08x',
+        'unsigned int': '0x%08x',
+        'unsigned long': '0x%08lx',
+        'unsigned long long': '0x%016llx',
+    }
+
+    def _printf_simple_format(self, typ: str) -> Optional[str]:
+        """Use this printf format for a value of typ.
+
+        Return None if values of typ need more complex handling.
+        """
+        return self._PRINTF_SIMPLE_FORMAT.get(typ)
+
+    _PRINTF_TYPE_CAST = {
+        'int32_t': 'int',
+        'uint32_t': 'unsigned',
+        'uint64_t': 'unsigned long long',
+    } #type: Dict[str, str]
+
+    def _printf_type_cast(self, typ: str) -> Optional[str]:
+        """Cast values of typ to this type before passing them to printf.
+
+        Return None if values of the given type do not need a cast.
+        """
+        return self._PRINTF_TYPE_CAST.get(typ)
+
+    _POINTER_TYPE_RE = re.compile(r'\s*\*\Z')
+
+    def _printf_parameters(self, typ: str, var: str) -> Tuple[str, List[str]]:
+        """The printf format and arguments for a value of type typ stored in var.
+        """
+        expr = var
+        base_type = typ
+        # For outputs via a pointer, get the value that has been written.
+        # Note: we don't support pointers to pointers here.
+        pointer_match = self._POINTER_TYPE_RE.search(base_type)
+        if pointer_match:
+            base_type = base_type[:pointer_match.start(0)]
+            expr = '*({})'.format(expr)
+        # Maybe cast the value to a standard type.
+        cast_to = self._printf_type_cast(base_type)
+        if cast_to is not None:
+            expr = '({}) {}'.format(cast_to, expr)
+            base_type = cast_to
+        # Try standard types.
+        fmt = self._printf_simple_format(base_type)
+        if fmt is not None:
+            return '{}={}'.format(var, fmt), [expr]
+        raise UnknownTypeForPrintf(typ)
+
+    def _write_function_logging(self, out: typing_util.Writable,
+                                function: FunctionInfo,
+                                argument_names: List[str]) -> None:
+        """Write code to log the function's inputs and outputs."""
+        formats, values = '%s', ['"' + function.name + '"']
+        for arg_info, arg_name in zip(function.arguments, argument_names):
+            fmt, vals = self._printf_parameters(arg_info.type, arg_name)
+            if fmt:
+                formats += ' ' + fmt
+                values += vals
+        if not function.returns_void():
+            ret_name = self._return_variable_name(function)
+            fmt, vals = self._printf_parameters(function.return_type, ret_name)
+            if fmt:
+                formats += ' ' + fmt
+                values += vals
+        out.write("""\
+#if defined(MBEDTLS_FS_IO) && defined(MBEDTLS_TEST_HOOKS)
+    if ({stream}) {{
+        mbedtls_fprintf({stream}, "{formats}\\n",
+                        {values});
+    }}
+#endif /* defined(MBEDTLS_FS_IO) && defined(MBEDTLS_TEST_HOOKS) */
+"""
+                  .format(stream=self.stream,
+                          formats=formats,
+                          values=', '.join(values)))
+
+    def _write_function_body(self, out: typing_util.Writable,
+                             function: FunctionInfo,
+                             argument_names: List[str]) -> None:
+        """Write the body of the wrapper code for the specified function.
+        """
+        self._write_function_call(out, function, argument_names)
+        self._write_function_logging(out, function, argument_names)
+        self._write_function_return(out, function)