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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
function PkEncryption() {
var size = Module['_olm_pk_encryption_size']();
this.buf = malloc(size);
this.ptr = Module['_olm_pk_encryption'](this.buf);
}
function pk_encryption_method(wrapped) {
return function() {
var result = wrapped.apply(this, arguments);
if (result === OLM_ERROR) {
var message = Pointer_stringify(
Module['_olm_pk_encryption_last_error'](arguments[0])
);
throw new Error("OLM." + message);
}
return result;
}
}
PkEncryption.prototype['free'] = function() {
Module['_olm_clear_pk_encryption'](this.ptr);
free(this.ptr);
}
PkEncryption.prototype['set_recipient_key'] = restore_stack(function(key) {
var key_array = array_from_string(key);
var key_buffer = stack(key_array);
pk_encryption_method(Module['_olm_pk_encryption_set_recipient_key'])(
this.ptr, key_buffer, key_array.length
);
});
PkEncryption.prototype['encrypt'] = restore_stack(function(
plaintext
) {
var plaintext_buffer, ciphertext_buffer, plaintext_length;
try {
plaintext_length = Module['lengthBytesUTF8'](plaintext)
plaintext_buffer = malloc(plaintext_length + 1);
Module['stringToUTF8'](plaintext, plaintext_buffer, plaintext_length + 1);
var random_length = pk_encryption_method(
Module['_olm_pk_encrypt_random_length']
)();
var random = random_stack(random_length);
var ciphertext_length = pk_encryption_method(
Module['_olm_pk_ciphertext_length']
)(this.ptr, plaintext_length);
ciphertext_buffer = malloc(ciphertext_length + NULL_BYTE_PADDING_LENGTH);
var mac_length = pk_encryption_method(
Module['_olm_pk_mac_length']
)(this.ptr);
var mac_buffer = stack(mac_length + NULL_BYTE_PADDING_LENGTH);
Module['setValue'](
mac_buffer+mac_length,
0, "i8"
);
var ephemeral_length = pk_encryption_method(
Module['_olm_pk_key_length']
)();
var ephemeral_buffer = stack(ephemeral_length + NULL_BYTE_PADDING_LENGTH);
Module['setValue'](
ephemeral_buffer+ephemeral_length,
0, "i8"
);
pk_encryption_method(Module['_olm_pk_encrypt'])(
this.ptr,
plaintext_buffer, plaintext_length,
ciphertext_buffer, ciphertext_length,
mac_buffer, mac_length,
ephemeral_buffer, ephemeral_length,
random, random_length
);
// UTF8ToString requires a null-terminated argument, so add the
// null terminator.
Module['setValue'](
ciphertext_buffer+ciphertext_length,
0, "i8"
);
return {
"ciphertext": Module['UTF8ToString'](ciphertext_buffer),
"mac": Pointer_stringify(mac_buffer),
"ephemeral": Pointer_stringify(ephemeral_buffer)
};
} finally {
if (plaintext_buffer !== undefined) {
// don't leave a copy of the plaintext in the heap.
bzero(plaintext_buffer, plaintext_length + 1);
free(plaintext_buffer);
}
if (ciphertext_buffer !== undefined) {
free(ciphertext_buffer);
}
}
});
function PkDecryption() {
var size = Module['_olm_pk_decryption_size']();
this.buf = malloc(size);
this.ptr = Module['_olm_pk_decryption'](this.buf);
}
function pk_decryption_method(wrapped) {
return function() {
var result = wrapped.apply(this, arguments);
if (result === OLM_ERROR) {
var message = Pointer_stringify(
Module['_olm_pk_decryption_last_error'](arguments[0])
);
throw new Error("OLM." + message);
}
return result;
}
}
PkDecryption.prototype['free'] = function() {
Module['_olm_clear_pk_decryption'](this.ptr);
free(this.ptr);
}
PkDecryption.prototype['generate_key'] = restore_stack(function () {
var random_length = pk_decryption_method(
Module['_olm_pk_generate_key_random_length']
)();
var random_buffer = random_stack(random_length);
var pubkey_length = pk_encryption_method(
Module['_olm_pk_key_length']
)();
var pubkey_buffer = stack(pubkey_length + NULL_BYTE_PADDING_LENGTH);
pk_decryption_method(Module['_olm_pk_generate_key'])(
this.ptr,
pubkey_buffer, pubkey_length,
random_buffer, random_length
);
return Pointer_stringify(pubkey_buffer);
});
PkDecryption.prototype['decrypt'] = restore_stack(function (
ephemeral_key, mac, ciphertext
) {
var plaintext_buffer, ciphertext_buffer, plaintext_max_length;
try {
ciphertext_length = Module['lengthBytesUTF8'](ciphertext)
ciphertext_buffer = malloc(ciphertext_length + 1);
Module['stringToUTF8'](ciphertext, ciphertext_buffer, ciphertext_length + 1);
var ephemeralkey_array = array_from_string(ephemeral_key);
var ephemeralkey_buffer = stack(ephemeralkey_array);
var mac_array = array_from_string(mac);
var mac_buffer = stack(mac_array);
plaintext_max_length = pk_decryption_method(Module['_olm_pk_max_plaintext_length'])(
this.ptr,
ciphertext_length
);
plaintext_buffer = malloc(plaintext_max_length + NULL_BYTE_PADDING_LENGTH);
var plaintext_length = pk_decryption_method(Module['_olm_pk_decrypt'])(
this.ptr,
ephemeralkey_buffer, ephemeralkey_array.length,
mac_buffer, mac_array.length,
ciphertext_buffer, ciphertext_length,
plaintext_buffer, plaintext_max_length
);
// UTF8ToString requires a null-terminated argument, so add the
// null terminator.
Module['setValue'](
plaintext_buffer+plaintext_length,
0, "i8"
);
return Module['UTF8ToString'](plaintext_buffer);
} finally {
if (plaintext_buffer !== undefined) {
// don't leave a copy of the plaintext in the heap.
bzero(plaintext_buffer, plaintext_length + 1);
free(plaintext_buffer);
}
if (ciphertext_buffer !== undefined) {
free(ciphertext_buffer);
}
}
})
|
