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/*
* (C) 2015,2017 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/ffi.h>
#include <botan/internal/ffi_util.h>
#include <botan/internal/os_utils.h>
#include <botan/version.h>
#include <botan/mem_ops.h>
#include <botan/hex.h>
#include <botan/base64.h>
#include <cstdio>
#include <cstdlib>
namespace Botan_FFI {
int ffi_error_exception_thrown(const char* func_name, const char* exn, int rc)
{
if(Botan::OS::running_in_privileged_state() == false && std::getenv("BOTAN_FFI_PRINT_EXCEPTIONS") != nullptr)
{
std::fprintf(stderr, "in %s exception '%s' returning %d\n", func_name, exn, rc);
}
return rc;
}
int ffi_guard_thunk(const char* func_name, std::function<int ()> thunk)
{
try
{
return thunk();
}
catch(std::bad_alloc&)
{
return ffi_error_exception_thrown(func_name, "bad_alloc", BOTAN_FFI_ERROR_OUT_OF_MEMORY);
}
catch(Botan_FFI::FFI_Error& e)
{
return ffi_error_exception_thrown(func_name, e.what(), e.error_code());
}
catch(Botan::Lookup_Error& e)
{
return ffi_error_exception_thrown(func_name, e.what(), BOTAN_FFI_ERROR_NOT_IMPLEMENTED);
}
catch(Botan::Invalid_Key_Length& e)
{
return ffi_error_exception_thrown(func_name, e.what(), BOTAN_FFI_ERROR_INVALID_KEY_LENGTH);
}
catch(Botan::Key_Not_Set& e)
{
return ffi_error_exception_thrown(func_name, e.what(), BOTAN_FFI_ERROR_KEY_NOT_SET);
}
catch(Botan::Invalid_Argument& e)
{
return ffi_error_exception_thrown(func_name, e.what(), BOTAN_FFI_ERROR_BAD_PARAMETER);
}
catch(Botan::Not_Implemented& e)
{
return ffi_error_exception_thrown(func_name, e.what(), BOTAN_FFI_ERROR_NOT_IMPLEMENTED);
}
catch(std::exception& e)
{
return ffi_error_exception_thrown(func_name, e.what());
}
catch(...)
{
return ffi_error_exception_thrown(func_name, "unknown exception");
}
return BOTAN_FFI_ERROR_UNKNOWN_ERROR;
}
}
extern "C" {
using namespace Botan_FFI;
const char* botan_error_description(int err)
{
switch(err)
{
case BOTAN_FFI_SUCCESS:
return "OK";
case BOTAN_FFI_INVALID_VERIFIER:
return "Invalid verifier";
case BOTAN_FFI_ERROR_INVALID_INPUT:
return "Invalid input";
case BOTAN_FFI_ERROR_BAD_MAC:
return "Invalid authentication code";
case BOTAN_FFI_ERROR_INSUFFICIENT_BUFFER_SPACE:
return "Insufficient buffer space";
case BOTAN_FFI_ERROR_EXCEPTION_THROWN:
return "Exception thrown";
case BOTAN_FFI_ERROR_OUT_OF_MEMORY:
return "Out of memory";
case BOTAN_FFI_ERROR_BAD_FLAG:
return "Bad flag";
case BOTAN_FFI_ERROR_NULL_POINTER:
return "Null pointer argument";
case BOTAN_FFI_ERROR_BAD_PARAMETER:
return "Bad parameter";
case BOTAN_FFI_ERROR_KEY_NOT_SET:
return "Key not set on object";
case BOTAN_FFI_ERROR_INVALID_KEY_LENGTH:
return "Invalid key length";
case BOTAN_FFI_ERROR_NOT_IMPLEMENTED:
return "Not implemented";
case BOTAN_FFI_ERROR_INVALID_OBJECT:
return "Invalid object handle";
case BOTAN_FFI_ERROR_UNKNOWN_ERROR:
return "Unknown error";
}
return "Unknown error";
}
/*
* Versioning
*/
uint32_t botan_ffi_api_version()
{
return BOTAN_HAS_FFI;
}
int botan_ffi_supports_api(uint32_t api_version)
{
// This is the API introduced in 2.8
if(api_version == 20180713)
return BOTAN_FFI_SUCCESS;
// This is the API introduced in 2.3
if(api_version == 20170815)
return BOTAN_FFI_SUCCESS;
// This is the API introduced in 2.1
if(api_version == 20170327)
return BOTAN_FFI_SUCCESS;
// This is the API introduced in 2.0
if(api_version == 20150515)
return BOTAN_FFI_SUCCESS;
// Something else:
return -1;
}
const char* botan_version_string()
{
return Botan::version_cstr();
}
uint32_t botan_version_major() { return Botan::version_major(); }
uint32_t botan_version_minor() { return Botan::version_minor(); }
uint32_t botan_version_patch() { return Botan::version_patch(); }
uint32_t botan_version_datestamp() { return Botan::version_datestamp(); }
int botan_constant_time_compare(const uint8_t* x, const uint8_t* y, size_t len)
{
return Botan::constant_time_compare(x, y, len) ? 0 : -1;
}
int botan_same_mem(const uint8_t* x, const uint8_t* y, size_t len)
{
return botan_constant_time_compare(x, y, len);
}
int botan_scrub_mem(void* mem, size_t bytes)
{
Botan::secure_scrub_memory(mem, bytes);
return BOTAN_FFI_SUCCESS;
}
int botan_hex_encode(const uint8_t* in, size_t len, char* out, uint32_t flags)
{
return ffi_guard_thunk(__func__, [=]() -> int {
const bool uppercase = (flags & BOTAN_FFI_HEX_LOWER_CASE) == 0;
Botan::hex_encode(out, in, len, uppercase);
return BOTAN_FFI_SUCCESS;
});
}
int botan_hex_decode(const char* hex_str, size_t in_len, uint8_t* out, size_t* out_len)
{
return ffi_guard_thunk(__func__, [=]() -> int {
const std::vector<uint8_t> bin = Botan::hex_decode(hex_str, in_len);
return Botan_FFI::write_vec_output(out, out_len, bin);
});
}
int botan_base64_encode(const uint8_t* in, size_t len, char* out, size_t* out_len)
{
return ffi_guard_thunk(__func__, [=]() -> int {
const std::string base64 = Botan::base64_encode(in, len);
return Botan_FFI::write_str_output(out, out_len, base64);
});
}
int botan_base64_decode(const char* base64_str, size_t in_len,
uint8_t* out, size_t* out_len)
{
return ffi_guard_thunk(__func__, [=]() -> int {
if(*out_len < Botan::base64_decode_max_output(in_len))
{
*out_len = Botan::base64_decode_max_output(in_len);
return BOTAN_FFI_ERROR_INSUFFICIENT_BUFFER_SPACE;
}
*out_len = Botan::base64_decode(out, std::string(base64_str, in_len));
return BOTAN_FFI_SUCCESS;
});
}
}
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