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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
use advapi32::{CryptAcquireContextW, CryptCreateHash, CryptDestroyHash, CryptGetHashParam,
CryptHashData, CryptReleaseContext};
use std::io;
use std::ptr;
use super::Algorithm;
use winapi::{CALG_MD5, CALG_SHA1, CALG_SHA_256, CALG_SHA_512, CRYPT_SILENT, CRYPT_VERIFYCONTEXT,
DWORD, HCRYPTHASH, HCRYPTPROV, HP_HASHVAL, PROV_RSA_AES};
macro_rules! call {
($e: expr) => ({
if $e == 0 {
panic!("failed {}: {}", stringify!($e), io::Error::last_os_error())
}
})
}
macro_rules! finish_algorithm {
($func_name: ident, $size: ident) => {
fn $func_name(&mut self) -> Vec<u8> {
let mut len = $size as u32;
let mut hash = [0u8; $size];
call!(unsafe {
CryptGetHashParam(self.hcrypthash, HP_HASHVAL, hash.as_mut_ptr(), &mut len, 0)
});
assert_eq!(len as usize, hash.len());
hash.to_vec()
}
}
}
const MD5_LENGTH: usize = 16;
const SHA1_LENGTH: usize = 20;
const SHA256_LENGTH: usize = 32;
const SHA512_LENGTH: usize = 64;
pub struct Hasher {
algorithm: Algorithm,
hcryptprov: HCRYPTPROV,
hcrypthash: HCRYPTHASH,
}
impl Hasher {
pub fn new(algorithm: Algorithm) -> Hasher {
let mut hcp = 0;
call!(unsafe {
CryptAcquireContextW(&mut hcp,
ptr::null(),
ptr::null(),
PROV_RSA_AES,
CRYPT_VERIFYCONTEXT | CRYPT_SILENT)
});
let hash_type = match algorithm {
Algorithm::MD5 => CALG_MD5,
Algorithm::SHA1 => CALG_SHA1,
Algorithm::SHA256 => CALG_SHA_256,
Algorithm::SHA512 => CALG_SHA_512,
};
let mut ret = Hasher {
algorithm: algorithm,
hcryptprov: hcp,
hcrypthash: 0,
};
call!(unsafe { CryptCreateHash(ret.hcryptprov, hash_type, 0, 0, &mut ret.hcrypthash) });
ret
}
pub fn finish(&mut self) -> Vec<u8> {
match self.algorithm {
Algorithm::MD5 => self.finish_md5(),
Algorithm::SHA1 => self.finish_sha1(),
Algorithm::SHA256 => self.finish_sha256(),
Algorithm::SHA512 => self.finish_sha512(),
}
}
finish_algorithm!(finish_md5, MD5_LENGTH);
finish_algorithm!(finish_sha1, SHA1_LENGTH);
finish_algorithm!(finish_sha256, SHA256_LENGTH);
finish_algorithm!(finish_sha512, SHA512_LENGTH);
}
impl io::Write for Hasher {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
call!(unsafe {
CryptHashData(self.hcrypthash,
buf.as_ptr() as *mut _,
buf.len() as DWORD,
0)
});
Ok(buf.len())
}
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
impl Drop for Hasher {
fn drop(&mut self) {
if self.hcrypthash != 0 {
call!(unsafe { CryptDestroyHash(self.hcrypthash) });
}
call!(unsafe { CryptReleaseContext(self.hcryptprov, 0) });
}
}