Annotation of embedaddon/strongswan/src/libstrongswan/plugins/sha3/sha3_hasher.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (C) 2015-2016 Andreas Steffen
3: * HSR Hochschule fuer Technik Rapperswil
4: *
5: * This program is free software; you can redistribute it and/or modify it
6: * under the terms of the GNU General Public License as published by the
7: * Free Software Foundation; either version 2 of the License, or (at your
8: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9: *
10: * This program is distributed in the hope that it will be useful, but
11: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13: * for more details.
14: */
15:
16: #include <string.h>
17:
18: #include "sha3_hasher.h"
19: #include "sha3_keccak.h"
20:
21: typedef struct private_sha3_hasher_t private_sha3_hasher_t;
22:
23: /**
24: * Private data structure with hashing context for SHA-3
25: */
26: struct private_sha3_hasher_t {
27:
28: /**
29: * Public interface for this hasher.
30: */
31: sha3_hasher_t public;
32:
33: /**
34: * SHA-3 algorithm to be used
35: */
36: hash_algorithm_t algorithm;
37:
38: /**
39: * SHA-3 Keccak state
40: */
41: sha3_keccak_t *keccak;
42:
43: };
44:
45: METHOD(hasher_t, reset, bool,
46: private_sha3_hasher_t *this)
47: {
48: this->keccak->reset(this->keccak);
49: return TRUE;
50: }
51:
52: METHOD(hasher_t, get_hash_size, size_t,
53: private_sha3_hasher_t *this)
54: {
55: switch (this->algorithm)
56: {
57: case HASH_SHA3_224:
58: return HASH_SIZE_SHA224;
59: case HASH_SHA3_256:
60: return HASH_SIZE_SHA256;
61: case HASH_SHA3_384:
62: return HASH_SIZE_SHA384;
63: case HASH_SHA3_512:
64: return HASH_SIZE_SHA512;
65: default:
66: return 0;
67: }
68: }
69:
70:
71: METHOD(hasher_t, get_hash, bool,
72: private_sha3_hasher_t *this, chunk_t chunk, uint8_t *buffer)
73: {
74: this->keccak->absorb(this->keccak, chunk);
75:
76: if (buffer != NULL)
77: {
78: this->keccak->finalize(this->keccak);
79: this->keccak->squeeze(this->keccak, get_hash_size(this), buffer);
80: this->keccak->reset(this->keccak);
81: }
82: return TRUE;
83: }
84:
85: METHOD(hasher_t, allocate_hash, bool,
86: private_sha3_hasher_t *this, chunk_t chunk, chunk_t *hash)
87: {
88: chunk_t allocated_hash;
89:
90: this->keccak->absorb(this->keccak, chunk);
91:
92: if (hash != NULL)
93: {
94: this->keccak->finalize(this->keccak);
95: allocated_hash = chunk_alloc(get_hash_size(this));
96: this->keccak->squeeze(this->keccak, allocated_hash.len,
97: allocated_hash.ptr);
98: this->keccak->reset(this->keccak);
99: *hash = allocated_hash;
100: }
101: return TRUE;
102: }
103:
104: METHOD(hasher_t, destroy, void,
105: private_sha3_hasher_t *this)
106: {
107: this->keccak->destroy(this->keccak);
108: free(this);
109: }
110:
111: /*
112: * Described in header.
113: */
114: sha3_hasher_t *sha3_hasher_create(hash_algorithm_t algorithm)
115: {
116: private_sha3_hasher_t *this;
117:
118: switch (algorithm)
119: {
120: case HASH_SHA3_224:
121: case HASH_SHA3_256:
122: case HASH_SHA3_384:
123: case HASH_SHA3_512:
124: break;
125: default:
126: return NULL;
127: }
128:
129: INIT(this,
130: .public = {
131: .hasher_interface = {
132: .reset = _reset,
133: .get_hash_size = _get_hash_size,
134: .get_hash = _get_hash,
135: .allocate_hash = _allocate_hash,
136: .destroy = _destroy,
137: },
138: },
139: .algorithm = algorithm,
140: );
141:
142: this->keccak = sha3_keccak_create(2*get_hash_size(this), 0x06);
143: if (!this->keccak)
144: {
145: free(this);
146: return NULL;
147: }
148:
149: return &this->public;
150: }
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