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Side by Side Diff: src/platform/cryptohome/username_passhash.h

Issue 2051003: Initial patch from Will. (Closed) Base URL: ssh://git@chromiumos-git/chromiumos
Patch Set: Address style nits. Created 10 years, 7 months ago
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1 // Copyright (c) 2009-2010 The Chromium OS Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // UsernamePasshash wraps a username/salted password hash pair that
6 // can be used to authenticate a user.
7
8 #ifndef CRYPTOHOME_USERNAME_PASSHASH_H_
9 #define CRYPTOHOME_USERNAME_PASSHASH_H_
10
11 #include "cryptohome/credentials.h"
12
13 #include <string.h>
14
15 #include "base/basictypes.h"
16
17 namespace cryptohome {
18
19 class UsernamePasshash : public Credentials {
20 public:
21 // |passhash| is a weak hash of the user's password, using the same
22 // algorithm that pam/pam_google/pam_mount use to get the user's
23 // plaintext passhash safely passed on to the login session. That
24 // means we compute a sha256sum of the ASCII encoded system salt plus
25 // the plaintext passhash, ASCII encode the result, and take the first
26 // 32 bytes. To say that in bash...
27 //
28 // $(cat <(echo -n $(xxd -p "$SYSTEM_SALT_FILE"))
29 // <(echo -n "$PASSHASH") | sha256sum | head -c 32)
30 //
31 UsernamePasshash(const char *username, const int username_length,
32 const char *passhash, const int passhash_length);
33
34 ~UsernamePasshash() {}
35
36 // Overridden from cryptohome::Credentials
37 void GetFullUsername(char *name_buffer, int length) const;
38 void GetPartialUsername(char *name_buffer, int length) const;
39 std::string GetObfuscatedUsername(const chromeos::Blob &system_salt) const;
40 std::string GetPasswordWeakHash(const chromeos::Blob &system_salt) const;
41
42 private:
43 std::string username_;
44 std::string passhash_;
45
46 DISALLOW_COPY_AND_ASSIGN(UsernamePasshash);
47 };
48
49 } // namespace cryptohome
50
51 #endif // CRYPTOHOME_USERNAME_PASSHASH_H_
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