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1.1 misho 1: /* 2: * Copyright (C) 2009 Martin Willi 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 "gcrypt_hasher.h" 17: 18: #include <utils/debug.h> 19: 20: #include <gcrypt.h> 21: 22: typedef struct private_gcrypt_hasher_t private_gcrypt_hasher_t; 23: 24: /** 25: * Private data of gcrypt_hasher_t 26: */ 27: struct private_gcrypt_hasher_t { 28: 29: /** 30: * Public part of this class. 31: */ 32: gcrypt_hasher_t public; 33: 34: /** 35: * gcrypt hasher context 36: */ 37: gcry_md_hd_t hd; 38: }; 39: 40: METHOD(hasher_t, get_hash_size, size_t, 41: private_gcrypt_hasher_t *this) 42: { 43: return gcry_md_get_algo_dlen(gcry_md_get_algo(this->hd)); 44: } 45: 46: METHOD(hasher_t, reset, bool, 47: private_gcrypt_hasher_t *this) 48: { 49: gcry_md_reset(this->hd); 50: return TRUE; 51: } 52: 53: METHOD(hasher_t, get_hash, bool, 54: private_gcrypt_hasher_t *this, chunk_t chunk, uint8_t *hash) 55: { 56: gcry_md_write(this->hd, chunk.ptr, chunk.len); 57: if (hash) 58: { 59: memcpy(hash, gcry_md_read(this->hd, 0), get_hash_size(this)); 60: gcry_md_reset(this->hd); 61: } 62: return TRUE; 63: } 64: 65: METHOD(hasher_t, allocate_hash, bool, 66: private_gcrypt_hasher_t *this, chunk_t chunk, chunk_t *hash) 67: { 68: if (hash) 69: { 70: *hash = chunk_alloc(get_hash_size(this)); 71: return get_hash(this, chunk, hash->ptr); 72: } 73: return get_hash(this, chunk, NULL); 74: } 75: 76: METHOD(hasher_t, destroy, void, 77: private_gcrypt_hasher_t *this) 78: { 79: gcry_md_close(this->hd); 80: free(this); 81: } 82: 83: /* 84: * Described in header 85: */ 86: gcrypt_hasher_t *gcrypt_hasher_create(hash_algorithm_t algo) 87: { 88: private_gcrypt_hasher_t *this; 89: int gcrypt_alg; 90: gcry_error_t err; 91: 92: switch (algo) 93: { 94: case HASH_MD2: 95: gcrypt_alg = GCRY_MD_MD2; 96: break; 97: case HASH_MD4: 98: gcrypt_alg = GCRY_MD_MD4; 99: break; 100: case HASH_MD5: 101: gcrypt_alg = GCRY_MD_MD5; 102: break; 103: case HASH_SHA1: 104: gcrypt_alg = GCRY_MD_SHA1; 105: break; 106: case HASH_SHA224: 107: gcrypt_alg = GCRY_MD_SHA224; 108: break; 109: case HASH_SHA256: 110: gcrypt_alg = GCRY_MD_SHA256; 111: break; 112: case HASH_SHA384: 113: gcrypt_alg = GCRY_MD_SHA384; 114: break; 115: case HASH_SHA512: 116: gcrypt_alg = GCRY_MD_SHA512; 117: break; 118: default: 119: return NULL; 120: } 121: 122: INIT(this, 123: .public = { 124: .hasher = { 125: .get_hash = _get_hash, 126: .allocate_hash = _allocate_hash, 127: .get_hash_size = _get_hash_size, 128: .reset = _reset, 129: .destroy = _destroy, 130: }, 131: }, 132: ); 133: 134: err = gcry_md_open(&this->hd, gcrypt_alg, 0); 135: if (err) 136: { 137: DBG1(DBG_LIB, "grcy_md_open(%N) failed: %s", 138: hash_algorithm_names, algo, gpg_strerror(err)); 139: free(this); 140: return NULL; 141: } 142: 143: return &this->public; 144: } 145: