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
|
#include "charptr-cast.hh"
#include "crypto.hh"
#include "file-system.hh"
#include "globals.hh"
#include "strings.hh"
#include <sodium.h>
namespace nix {
static std::pair<std::string_view, std::string_view> split(std::string_view s)
{
size_t colon = s.find(':');
if (colon == std::string::npos || colon == 0)
return {"", ""};
return {s.substr(0, colon), s.substr(colon + 1)};
}
Key::Key(std::string_view s)
{
auto ss = split(s);
name = ss.first;
key = ss.second;
if (name == "" || key == "")
throw Error("secret key is corrupt");
key = base64Decode(key);
}
std::string Key::to_string() const
{
return name + ":" + base64Encode(key);
}
SecretKey::SecretKey(std::string_view s)
: Key(s)
{
if (key.size() != crypto_sign_SECRETKEYBYTES)
throw Error("secret key is not valid");
}
std::string SecretKey::signDetached(std::string_view data) const
{
unsigned char sig[crypto_sign_BYTES];
unsigned long long sigLen;
crypto_sign_detached(sig, &sigLen, charptr_cast<const unsigned char *>(data.data()), data.size(),
charptr_cast<const unsigned char *>(key.data()));
return name + ":" + base64Encode(std::string(reinterpret_cast<char *>(sig), sigLen));
}
PublicKey SecretKey::toPublicKey() const
{
unsigned char pk[crypto_sign_PUBLICKEYBYTES];
crypto_sign_ed25519_sk_to_pk(pk, charptr_cast<const unsigned char *>(key.data()));
return PublicKey(name, std::string(reinterpret_cast<char *>(pk), crypto_sign_PUBLICKEYBYTES));
}
SecretKey SecretKey::generate(std::string_view name)
{
unsigned char pk[crypto_sign_PUBLICKEYBYTES];
unsigned char sk[crypto_sign_SECRETKEYBYTES];
if (crypto_sign_keypair(pk, sk) != 0)
throw Error("key generation failed");
return SecretKey(name, std::string(reinterpret_cast<char *>(sk), crypto_sign_SECRETKEYBYTES));
}
PublicKey::PublicKey(std::string_view s)
: Key(s)
{
if (key.size() != crypto_sign_PUBLICKEYBYTES)
throw Error("public key is not valid");
}
bool verifyDetached(const std::string & data, const std::string & sig,
const PublicKeys & publicKeys)
{
auto ss = split(sig);
auto key = publicKeys.find(std::string(ss.first));
if (key == publicKeys.end()) return false;
auto sig2 = base64Decode(ss.second);
if (sig2.size() != crypto_sign_BYTES)
throw Error("signature is not valid");
return crypto_sign_verify_detached(charptr_cast<unsigned char *>(sig2.data()),
charptr_cast<const unsigned char *>(data.data()), data.size(),
charptr_cast<const unsigned char *>(key->second.key.data())) == 0;
}
PublicKeys getDefaultPublicKeys()
{
PublicKeys publicKeys;
// FIXME: filter duplicates
for (auto s : settings.trustedPublicKeys.get()) {
PublicKey key(s);
publicKeys.emplace(key.name, key);
}
for (auto secretKeyFile : settings.secretKeyFiles.get()) {
try {
SecretKey secretKey(readFile(secretKeyFile));
publicKeys.emplace(secretKey.name, secretKey.toPublicKey());
} catch (SysError & e) {
/* Ignore unreadable key files. That's normal in a
multi-user installation. */
}
}
return publicKeys;
}
}
|
