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
|
using GLib;
namespace Crypto {
public class SymmetricCipherEncrypter : Converter, Object {
private SymmetricCipherEncryption cipher;
private size_t attached_taglen;
public SymmetricCipherEncrypter(owned SymmetricCipherEncryption cipher, size_t attached_taglen = 0) {
this.cipher = (owned) cipher;
this.attached_taglen = attached_taglen;
}
public void reset() {
try {
cipher.reset();
} catch (Crypto.Error e) {
warning(@"$(e.domain) error while resetting cipher: $(e.message)");
}
}
public uint8[] get_tag(size_t taglen) throws Error {
return ((SymmetricCipherEncryption)cipher).get_tag(taglen);
}
public ConverterResult convert(uint8[] inbuf, uint8[] outbuf, ConverterFlags flags, out size_t bytes_read, out size_t bytes_written) throws IOError {
if (inbuf.length > outbuf.length) {
throw new IOError.NO_SPACE("CipherConverter needs at least the size of input as output space");
}
if ((flags & ConverterFlags.INPUT_AT_END) != 0 && inbuf.length + attached_taglen > outbuf.length) {
throw new IOError.NO_SPACE("CipherConverter needs additional output space to attach tag");
}
try {
if (inbuf.length > 0) {
((SymmetricCipherEncryption)cipher).encrypt(outbuf, inbuf);
}
bytes_read = inbuf.length;
bytes_written = inbuf.length;
if ((flags & ConverterFlags.INPUT_AT_END) != 0) {
if (attached_taglen > 0) {
Memory.copy((uint8*)outbuf + inbuf.length, get_tag(attached_taglen), attached_taglen);
bytes_written = inbuf.length + attached_taglen;
}
return ConverterResult.FINISHED;
}
if ((flags & ConverterFlags.FLUSH) != 0) {
return ConverterResult.FLUSHED;
}
return ConverterResult.CONVERTED;
} catch (Crypto.Error e) {
throw new IOError.FAILED(@"$(e.domain) error while encrypting: $(e.message)");
}
}
}
public class SymmetricCipherDecrypter : Converter, Object {
private SymmetricCipherDecryption cipher;
private size_t attached_taglen;
public SymmetricCipherDecrypter(owned SymmetricCipherDecryption cipher, size_t attached_taglen = 0) {
this.cipher = (owned) cipher;
this.attached_taglen = attached_taglen;
}
public void reset() {
try {
cipher.reset();
} catch (Crypto.Error e) {
warning(@"$(e.domain) error while resetting cipher: $(e.message)");
}
}
public void check_tag(uint8[] tag) throws Error {
((SymmetricCipherDecryption)cipher).check_tag(tag);
}
public ConverterResult convert(uint8[] inbuf, uint8[] outbuf, ConverterFlags flags, out size_t bytes_read, out size_t bytes_written) throws IOError {
if (inbuf.length > outbuf.length + attached_taglen) {
throw new IOError.NO_SPACE("CipherConverter needs at least the size of input as output space");
}
if ((flags & ConverterFlags.INPUT_AT_END) != 0 && inbuf.length < attached_taglen) {
throw new IOError.PARTIAL_INPUT("CipherConverter needs additional input to read tag");
} else if ((flags & ConverterFlags.INPUT_AT_END) == 0 && inbuf.length < attached_taglen + 1) {
throw new IOError.PARTIAL_INPUT("CipherConverter needs additional input to make sure to not accidentally read tag");
}
try {
inbuf.length -= (int) attached_taglen;
if (inbuf.length > 0) {
((SymmetricCipherDecryption)cipher).decrypt(outbuf, inbuf);
}
bytes_read = inbuf.length;
bytes_written = inbuf.length;
inbuf.length += (int) attached_taglen;
if ((flags & ConverterFlags.INPUT_AT_END) != 0) {
if (attached_taglen > 0) {
check_tag(inbuf[(inbuf.length - attached_taglen):inbuf.length]);
bytes_read = inbuf.length;
}
return ConverterResult.FINISHED;
}
if ((flags & ConverterFlags.FLUSH) != 0) {
return ConverterResult.FLUSHED;
}
return ConverterResult.CONVERTED;
} catch (Crypto.Error e) {
throw new IOError.FAILED(@"$(e.domain) error while decrypting: $(e.message)");
}
}
}
}
|
