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use std::{ ffi::CStr, io::{self, Write}, ptr, result, str::Utf8Error, }; use bitflags::bitflags; use cstr_argument::CStrArgument; use ffi; use libc::c_int; use crate::{error::return_err, NonNull, Result}; ffi_enum_wrapper! { #[allow(non_camel_case_types)] pub enum Algorithm: c_int { HmacSha256 = ffi::GCRY_MAC_HMAC_SHA256, HmacSha224 = ffi::GCRY_MAC_HMAC_SHA224, HmacSha512 = ffi::GCRY_MAC_HMAC_SHA512, HmacSha384 = ffi::GCRY_MAC_HMAC_SHA384, HmacSha1 = ffi::GCRY_MAC_HMAC_SHA1, HmacMd5 = ffi::GCRY_MAC_HMAC_MD5, HmacMd4 = ffi::GCRY_MAC_HMAC_MD4, HmacRmd160 = ffi::GCRY_MAC_HMAC_RMD160, HmacTiger1 = ffi::GCRY_MAC_HMAC_TIGER1, HmacWhirlpool = ffi::GCRY_MAC_HMAC_WHIRLPOOL, HmacGostR3411_94 = ffi::GCRY_MAC_HMAC_GOSTR3411_94, HmacStribog256 = ffi::GCRY_MAC_HMAC_STRIBOG256, HmacStribog512 = ffi::GCRY_MAC_HMAC_STRIBOG512, CmacAes = ffi::GCRY_MAC_CMAC_AES, Cmac3des = ffi::GCRY_MAC_CMAC_3DES, CmacCamellia = ffi::GCRY_MAC_CMAC_CAMELLIA, CmacCast5 = ffi::GCRY_MAC_CMAC_CAST5, CmacBlowfish = ffi::GCRY_MAC_CMAC_BLOWFISH, CmacTwofish = ffi::GCRY_MAC_CMAC_TWOFISH, CmacSerpent = ffi::GCRY_MAC_CMAC_SERPENT, CmacSeed = ffi::GCRY_MAC_CMAC_SEED, CmacRfc2268 = ffi::GCRY_MAC_CMAC_RFC2268, CmacIdea = ffi::GCRY_MAC_CMAC_IDEA, CmacGost28147 = ffi::GCRY_MAC_CMAC_GOST28147, GmacAes = ffi::GCRY_MAC_GMAC_AES, GmacCamellia = ffi::GCRY_MAC_GMAC_CAMELLIA, GmacTwofish = ffi::GCRY_MAC_GMAC_TWOFISH, GmacSerpent = ffi::GCRY_MAC_GMAC_SERPENT, GmacSeed = ffi::GCRY_MAC_GMAC_SEED, Poly1305 = ffi::GCRY_MAC_POLY1305, Poly1305Aes = ffi::GCRY_MAC_POLY1305_AES, Poly1305Camellia = ffi::GCRY_MAC_POLY1305_CAMELLIA, Poly1305Twofish = ffi::GCRY_MAC_POLY1305_TWOFISH, Poly1305Serpent = ffi::GCRY_MAC_POLY1305_SERPENT, Poly1305Seed = ffi::GCRY_MAC_POLY1305_SEED, } } impl Algorithm { #[inline] pub fn from_name(name: impl CStrArgument) -> Option<Algorithm> { let name = name.into_cstr(); let result = unsafe { ffi::gcry_mac_map_name(name.as_ref().as_ptr()) }; if result != 0 { unsafe { Some(Algorithm::from_raw(result)) } } else { None } } #[inline] pub fn is_available(&self) -> bool { let _ = crate::init_default(); unsafe { ffi::gcry_mac_test_algo(self.raw()) == 0 } } #[inline] pub fn name(&self) -> result::Result<&'static str, Option<Utf8Error>> { self.name_raw() .map_or(Err(None), |s| s.to_str().map_err(Some)) } #[inline] pub fn name_raw(&self) -> Option<&'static CStr> { unsafe { ffi::gcry_mac_algo_name(self.raw()) .as_ref() .map(|s| CStr::from_ptr(s)) } } #[inline] pub fn key_len(&self) -> usize { unsafe { ffi::gcry_mac_get_algo_keylen(self.raw()) as usize } } #[inline] pub fn mac_len(&self) -> usize { unsafe { ffi::gcry_mac_get_algo_maclen(self.raw()) as usize } } } bitflags! { pub struct Flags: ffi::gcry_mac_flags { const NONE = 0; const SECURE = ffi::GCRY_MAC_FLAG_SECURE; } } #[derive(Debug)] pub struct Mac(NonNull<ffi::gcry_mac_hd_t>); impl Drop for Mac { #[inline] fn drop(&mut self) { unsafe { ffi::gcry_mac_close(self.as_raw()); } } } impl Mac { impl_wrapper!(Mac: ffi::gcry_mac_hd_t); #[inline] pub fn new(algo: Algorithm) -> Result<Mac> { Mac::with_flags(algo, Flags::NONE) } #[inline] pub fn with_flags(algo: Algorithm, flags: Flags) -> Result<Mac> { let _ = crate::init_default(); unsafe { let mut handle: ffi::gcry_mac_hd_t = ptr::null_mut(); return_err!(ffi::gcry_mac_open( &mut handle, algo.raw(), flags.bits(), ptr::null_mut() )); Ok(Mac::from_raw(handle)) } } #[inline] pub fn set_key(&mut self, key: impl AsRef<[u8]>) -> Result<()> { let key = key.as_ref(); unsafe { return_err!(ffi::gcry_mac_setkey( self.as_raw(), key.as_ptr().cast(), key.len() )); } Ok(()) } #[inline] pub fn set_iv(&mut self, iv: impl AsRef<[u8]>) -> Result<()> { let iv = iv.as_ref(); unsafe { return_err!(ffi::gcry_mac_setiv( self.as_raw(), iv.as_ptr().cast(), iv.len() )); } Ok(()) } #[inline] pub fn reset(&mut self) -> Result<()> { unsafe { return_err!(ffi::gcry_mac_reset(self.as_raw())); } Ok(()) } #[inline] pub fn update(&mut self, bytes: &[u8]) -> Result<()> { unsafe { return_err!(ffi::gcry_mac_write( self.as_raw(), bytes.as_ptr().cast(), bytes.len() )); } Ok(()) } #[inline] pub fn get_mac(&mut self, buf: &mut [u8]) -> Result<usize> { let mut len = buf.len(); unsafe { return_err!(ffi::gcry_mac_read( self.as_raw(), buf.as_mut_ptr().cast(), &mut len )); } Ok(len) } #[inline] pub fn verify(&mut self, buf: &[u8]) -> Result<()> { unsafe { return_err!(ffi::gcry_mac_verify( self.as_raw(), buf.as_ptr().cast(), buf.len() )); } Ok(()) } } impl Write for Mac { #[inline] fn write(&mut self, buf: &[u8]) -> io::Result<usize> { self.update(buf)?; Ok(buf.len()) } #[inline] fn flush(&mut self) -> io::Result<()> { Ok(()) } }