You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

167 lines
4.5 KiB

4 years ago
//! FFI exported functions
use super::*;
/// Calculate the length in bytes of a kana hash output.
///
/// # Note
/// Does not consume `salt`
#[no_mangle]
pub unsafe extern "C" fn khash_length(context: *const c_void, bin: *const c_void, sz: size_t, out_len: *mut size_t) -> i32
{
let context = context as *const ctx::CContext;
no_unwind!{
try error::Error::Unknown;
let context = ctx::Context::clone_from_raw(context);
let bin = HeapArray::<u8>::from_raw_copied(bin as *const u8, usize::from(sz));
let string = c_try!(generate(&context, &bin));
*out_len = string.bytes().len().into();
GENERIC_SUCCESS
}
}
/// Compute and write a kana hash output to a string.
///
/// # Note
/// Consumes `salt`
#[no_mangle]
pub unsafe extern "C" fn khash_do(context: *mut c_void, bin: *const c_void, sz: size_t, out_str: *mut c_char, str_len: size_t) -> i32
{
let context = context as *mut ctx::CContext;
no_unwind!{
try error::Error::Unknown;
let context = ctx::Context::from_raw(context);
let bin = HeapArray::<u8>::from_raw_copied(bin as *const u8, usize::from(sz));
let string: Vec<u8> = c_try!(generate(&context, &bin)).bytes().collect();
libc::memcpy(out_str as *mut c_void, &string[0] as *const u8 as *const c_void, std::cmp::min(str_len, string.len()));
GENERIC_SUCCESS
}
}
/// Free a context
#[no_mangle]
pub unsafe extern "C" fn khash_free_context(context: *mut c_void) -> i32
{
let context = context as *mut ctx::CContext;
no_unwind!{
drop(ctx::Context::from_raw(context));
GENERIC_SUCCESS
}
}
/// Create a new context
#[no_mangle]
pub unsafe extern "C" fn khash_new_context(algo: u8, salt_type: u8, bin: *const c_void, sz: size_t, nptr: *mut c_void) -> i32
{
let nptr = nptr as *mut ctx::CContext;
no_unwind!{
try error::Error::Unknown;
let salt = match salt_type {
salt::SALT_TYPE_SPECIFIC => {
let bin = HeapArray::<u8>::from_raw_copied(bin as *const u8, usize::from(sz));
salt::Salt::unfixed(&bin[..])
},
salt::SALT_TYPE_DEFAULT => {
salt::Salt::default()
},
salt::SALT_TYPE_RANDOM => {
match salt::Salt::random() {
Ok(v) => v,
Err(e) => return i32::from(error::Error::RNG(e)),
}
},
_ => {
salt::Salt::None
},
};
let context = ctx::Context::new(algo.into(), salt);
*nptr = context.into_raw();
GENERIC_SUCCESS
}
}
/// Clone a context
#[no_mangle]
pub unsafe extern "C" fn khash_clone_context(raw: *const c_void, out: *mut c_void) -> i32
{
let raw = raw as *const ctx::CContext;
let out = out as *mut ctx::CContext;
no_unwind!{
*out = ctx::Context::clone_from_raw(raw).into_raw();
GENERIC_SUCCESS
}
}
/// Free a salt allocated with `khash_new_salt`
#[no_mangle]
pub unsafe extern "C" fn khash_free_salt(salt: *mut c_void) -> i32
{
let salt = salt as *mut salt::FFI;
no_unwind!{
drop(salt::from_raw(salt));
GENERIC_SUCCESS
}
}
/// Create a new salt
#[no_mangle]
pub unsafe extern "C" fn khash_new_salt(salt_type: u8, bin: *const c_void, sz: size_t, nptr: *mut c_void) -> i32
{
let nptr = nptr as *mut salt::FFI;
no_unwind!{
try error::Error::Unknown;
match salt_type {
salt::SALT_TYPE_SPECIFIC => {
let bin = HeapArray::<u8>::from_raw_copied(bin as *const u8, usize::from(sz));
*nptr = salt::into_raw(salt::Salt::unfixed(&bin[..]));
},
salt::SALT_TYPE_DEFAULT => {
*nptr = salt::into_raw(salt::Salt::default());
},
salt::SALT_TYPE_RANDOM => {
*nptr = salt::into_raw(match salt::Salt::random() {
Ok(v) => v,
Err(e) => return i32::from(error::Error::RNG(e)),
})
},
_ => {
*nptr = salt::into_raw(salt::Salt::None);
},
}
GENERIC_SUCCESS
}
}
/// Clone a salt
#[no_mangle]
pub unsafe extern "C" fn khash_clone_salt(salt: *const c_void, out: *mut c_void) -> i32
{
let salt = salt as *const salt::FFI;
let out = out as *mut salt::FFI;
no_unwind!{
*out = salt::into_raw(salt::clone_from_raw(salt));
GENERIC_SUCCESS
}
}
/// Find the maximum length possible for a given algorithm's output.
#[no_mangle]
pub unsafe extern "C" fn khash_max_length(algo: u8, _input_sz: libc::size_t, max_len: *mut libc::size_t) -> i32
{
no_unwind!{
let hash_sz = match ctx::Algorithm::from(algo) {
ctx::Algorithm::Crc32 => std::mem::size_of::<hash::Crc32Checksum>(),
ctx::Algorithm::Crc64 => std::mem::size_of::<hash::Crc64Checksum>(),
ctx::Algorithm::Sha256 => std::mem::size_of::<hash::Sha256Hash>(),
ctx::Algorithm::Sha256Truncated => std::mem::size_of::<hash::Sha256Truncated>(),
};
*max_len = std::mem::size_of::<char>() * hash_sz;
GENERIC_SUCCESS
}
}