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
|
// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/crypto/signature_verifier.h"
#include <stdlib.h>
#include "base/crypto/cssm_init.h"
#include "base/logging.h"
namespace {
void* AppMalloc(CSSM_SIZE size, void *alloc_ref) {
return malloc(size);
}
void AppFree(void* mem_ptr, void* alloc_ref) {
free(mem_ptr);
}
void* AppRealloc(void* ptr, CSSM_SIZE size, void* alloc_ref) {
return realloc(ptr, size);
}
void* AppCalloc(uint32 num, CSSM_SIZE size, void* alloc_ref) {
return calloc(num, size);
}
const CSSM_API_MEMORY_FUNCS mem_funcs = {
AppMalloc,
AppFree,
AppRealloc,
AppCalloc,
NULL
};
} // namespace
namespace base {
SignatureVerifier::SignatureVerifier() : csp_handle_(0), sig_handle_(0) {
EnsureCSSMInit();
static CSSM_VERSION version = {2, 0};
CSSM_RETURN crtn;
crtn = CSSM_ModuleAttach(&gGuidAppleCSP, &version, &mem_funcs, 0,
CSSM_SERVICE_CSP, 0, CSSM_KEY_HIERARCHY_NONE,
NULL, 0, NULL, &csp_handle_);
DCHECK(crtn == CSSM_OK);
}
SignatureVerifier::~SignatureVerifier() {
Reset();
if (csp_handle_) {
CSSM_RETURN crtn = CSSM_ModuleDetach(csp_handle_);
DCHECK(crtn == CSSM_OK);
}
}
bool SignatureVerifier::VerifyInit(const uint8* signature_algorithm,
int signature_algorithm_len,
const uint8* signature,
int signature_len,
const uint8* public_key_info,
int public_key_info_len) {
signature_.assign(signature, signature + signature_len);
public_key_info_.assign(public_key_info,
public_key_info + public_key_info_len);
CSSM_ALGORITHMS key_alg = CSSM_ALGID_RSA; // TODO(wtc): hardcoded.
memset(&public_key_, 0, sizeof(public_key_));
public_key_.KeyData.Data = const_cast<uint8*>(&public_key_info_[0]);
public_key_.KeyData.Length = public_key_info_.size();
public_key_.KeyHeader.HeaderVersion = CSSM_KEYHEADER_VERSION;
public_key_.KeyHeader.BlobType = CSSM_KEYBLOB_RAW;
public_key_.KeyHeader.Format = CSSM_KEYBLOB_RAW_FORMAT_X509;
public_key_.KeyHeader.AlgorithmId = key_alg;
public_key_.KeyHeader.KeyClass = CSSM_KEYCLASS_PUBLIC_KEY;
public_key_.KeyHeader.KeyAttr = CSSM_KEYATTR_EXTRACTABLE;
public_key_.KeyHeader.KeyUsage = CSSM_KEYUSE_VERIFY;
CSSM_KEY_SIZE key_size;
CSSM_RETURN crtn;
crtn = CSSM_QueryKeySizeInBits(csp_handle_, NULL, &public_key_, &key_size);
if (crtn) {
NOTREACHED() << "CSSM_QueryKeySizeInBits failed: " << crtn;
return false;
}
public_key_.KeyHeader.LogicalKeySizeInBits = key_size.LogicalKeySizeInBits;
// TODO(wtc): decode signature_algorithm...
CSSM_ALGORITHMS sig_alg = CSSM_ALGID_SHA1WithRSA;
crtn = CSSM_CSP_CreateSignatureContext(csp_handle_, sig_alg, NULL,
&public_key_, &sig_handle_);
if (crtn) {
NOTREACHED();
return false;
}
crtn = CSSM_VerifyDataInit(sig_handle_);
if (crtn) {
NOTREACHED();
return false;
}
return true;
}
void SignatureVerifier::VerifyUpdate(const uint8* data_part,
int data_part_len) {
CSSM_DATA data;
data.Data = const_cast<uint8*>(data_part);
data.Length = data_part_len;
CSSM_RETURN crtn = CSSM_VerifyDataUpdate(sig_handle_, &data, 1);
DCHECK(crtn == CSSM_OK);
}
bool SignatureVerifier::VerifyFinal() {
CSSM_DATA sig;
sig.Data = const_cast<uint8*>(&signature_[0]);
sig.Length = signature_.size();
CSSM_RETURN crtn = CSSM_VerifyDataFinal(sig_handle_, &sig);
Reset();
// crtn is CSSMERR_CSP_VERIFY_FAILED if signature verification fails.
return (crtn == CSSM_OK);
}
void SignatureVerifier::Reset() {
CSSM_RETURN crtn;
if (sig_handle_) {
crtn = CSSM_DeleteContext(sig_handle_);
DCHECK(crtn == CSSM_OK);
sig_handle_ = 0;
}
signature_.clear();
// Can't call CSSM_FreeKey on public_key_ because we constructed
// public_key_ manually.
}
} // namespace base
|
