1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
pub use self::imp::Sha256;
#[cfg(not(windows))]
#[allow(bad_style, improper_ctypes)]
mod imp {
use libc;
enum EVP_MD_CTX {}
enum EVP_MD {}
enum ENGINE {}
extern {
fn EVP_DigestInit_ex(ctx: *mut EVP_MD_CTX,
kind: *const EVP_MD,
imp: *mut ENGINE) -> libc::c_int;
fn EVP_DigestUpdate(ctx: *mut EVP_MD_CTX,
d: *const libc::c_void,
cnt: libc::size_t) -> libc::c_int;
fn EVP_DigestFinal_ex(ctx: *mut EVP_MD_CTX, md: *mut libc::c_uchar,
s: *mut libc::c_uint) -> libc::c_int;
fn EVP_MD_CTX_create() -> *mut EVP_MD_CTX;
fn EVP_MD_CTX_destroy(ctx: *mut EVP_MD_CTX);
fn EVP_sha256() -> *const EVP_MD;
}
pub struct Sha256 { ctx: *mut EVP_MD_CTX }
impl Sha256 {
pub fn new() -> Sha256 {
unsafe {
let ctx = EVP_MD_CTX_create();
assert!(!ctx.is_null());
let ret = Sha256 { ctx: ctx };
let n = EVP_DigestInit_ex(ret.ctx, EVP_sha256(), 0 as *mut _);
assert_eq!(n, 1);
ret
}
}
pub fn update(&mut self, bytes: &[u8]) {
unsafe {
let n = EVP_DigestUpdate(self.ctx, bytes.as_ptr() as *const _,
bytes.len() as libc::size_t);
assert_eq!(n, 1);
}
}
pub fn finish(&mut self) -> [u8; 32] {
unsafe {
let mut ret = [0u8; 32];
let mut out = 0;
let n = EVP_DigestFinal_ex(self.ctx, ret.as_mut_ptr(), &mut out);
assert_eq!(n, 1);
assert_eq!(out, 32);
ret
}
}
}
impl Drop for Sha256 {
fn drop(&mut self) {
unsafe { EVP_MD_CTX_destroy(self.ctx) }
}
}
}
#[cfg(windows)]
mod imp {
extern crate winapi;
extern crate advapi32;
use std::io;
use std::ptr;
use self::winapi::{DWORD, HCRYPTPROV, HCRYPTHASH};
use self::winapi::{PROV_RSA_AES, CRYPT_SILENT, CRYPT_VERIFYCONTEXT, CALG_SHA_256, HP_HASHVAL};
use self::advapi32::{CryptAcquireContextW, CryptCreateHash, CryptDestroyHash};
use self::advapi32::{CryptGetHashParam, CryptHashData, CryptReleaseContext};
macro_rules! call{ ($e:expr) => ({
if $e == 0 {
panic!("failed {}: {}", stringify!($e), io::Error::last_os_error())
}
}) }
pub struct Sha256 {
hcryptprov: HCRYPTPROV,
hcrypthash: HCRYPTHASH,
}
impl Sha256 {
pub fn new() -> Sha256 {
let mut hcp = 0;
call!(unsafe {
CryptAcquireContextW(&mut hcp, ptr::null(), ptr::null(),
PROV_RSA_AES,
CRYPT_VERIFYCONTEXT | CRYPT_SILENT)
});
let mut ret = Sha256 { hcryptprov: hcp, hcrypthash: 0 };
call!(unsafe {
CryptCreateHash(ret.hcryptprov, CALG_SHA_256,
0, 0, &mut ret.hcrypthash)
});
ret
}
pub fn update(&mut self, bytes: &[u8]) {
call!(unsafe {
CryptHashData(self.hcrypthash, bytes.as_ptr() as *mut _,
bytes.len() as DWORD, 0)
})
}
pub fn finish(&mut self) -> [u8; 32] {
let mut ret = [0u8; 32];
let mut len = ret.len() as DWORD;
call!(unsafe {
CryptGetHashParam(self.hcrypthash, HP_HASHVAL, ret.as_mut_ptr(),
&mut len, 0)
});
assert_eq!(len as usize, ret.len());
ret
}
}
impl Drop for Sha256 {
fn drop(&mut self) {
if self.hcrypthash != 0 {
call!(unsafe { CryptDestroyHash(self.hcrypthash) });
}
call!(unsafe { CryptReleaseContext(self.hcryptprov, 0) });
}
}
}