Annotation of embedaddon/strongswan/src/libstrongswan/plugins/sha1/sha1_prf.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 2008 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 "sha1_prf.h"
! 17: #include "sha1_hasher.h"
! 18:
! 19: #include <library.h>
! 20:
! 21: typedef struct private_sha1_prf_t private_sha1_prf_t;
! 22: typedef struct private_sha1_hasher_t private_sha1_hasher_t;
! 23:
! 24: /**
! 25: * Private data structure with hashing context.
! 26: */
! 27: struct private_sha1_hasher_t {
! 28: /**
! 29: * Public interface for this hasher.
! 30: */
! 31: sha1_hasher_t public;
! 32:
! 33: /*
! 34: * State of the hasher. From sha1_hasher.c, do not change it!
! 35: */
! 36: uint32_t state[5];
! 37: uint32_t count[2];
! 38: uint8_t buffer[64];
! 39: };
! 40:
! 41: /**
! 42: * Private data structure with keyed prf context.
! 43: */
! 44: struct private_sha1_prf_t {
! 45:
! 46: /**
! 47: * public prf interface
! 48: */
! 49: sha1_prf_t public;
! 50:
! 51: /**
! 52: * internal used hasher
! 53: */
! 54: private_sha1_hasher_t *hasher;
! 55: };
! 56:
! 57: /**
! 58: * From sha1_hasher.c
! 59: */
! 60: extern void SHA1Update(private_sha1_hasher_t* this, uint8_t *data, uint32_t len);
! 61:
! 62: METHOD(prf_t, get_bytes, bool,
! 63: private_sha1_prf_t *this, chunk_t seed, uint8_t *bytes)
! 64: {
! 65: uint32_t *hash = (uint32_t*)bytes;
! 66:
! 67: SHA1Update(this->hasher, seed.ptr, seed.len);
! 68:
! 69: hash[0] = htonl(this->hasher->state[0]);
! 70: hash[1] = htonl(this->hasher->state[1]);
! 71: hash[2] = htonl(this->hasher->state[2]);
! 72: hash[3] = htonl(this->hasher->state[3]);
! 73: hash[4] = htonl(this->hasher->state[4]);
! 74:
! 75: return TRUE;
! 76: }
! 77:
! 78: METHOD(prf_t, get_block_size, size_t,
! 79: private_sha1_prf_t *this)
! 80: {
! 81: return HASH_SIZE_SHA1;
! 82: }
! 83:
! 84: METHOD(prf_t, allocate_bytes, bool,
! 85: private_sha1_prf_t *this, chunk_t seed, chunk_t *chunk)
! 86: {
! 87: *chunk = chunk_alloc(HASH_SIZE_SHA1);
! 88: return get_bytes(this, seed, chunk->ptr);
! 89: }
! 90:
! 91: METHOD(prf_t, get_key_size, size_t,
! 92: private_sha1_prf_t *this)
! 93: {
! 94: return sizeof(this->hasher->state);
! 95: }
! 96:
! 97: METHOD(prf_t, set_key, bool,
! 98: private_sha1_prf_t *this, chunk_t key)
! 99: {
! 100: int i, rounds;
! 101: uint32_t *iv = (uint32_t*)key.ptr;
! 102:
! 103: if (!this->hasher->public.hasher_interface.reset(
! 104: &this->hasher->public.hasher_interface))
! 105: {
! 106: return FALSE;
! 107: }
! 108: rounds = min(key.len/sizeof(uint32_t), sizeof(this->hasher->state));
! 109: for (i = 0; i < rounds; i++)
! 110: {
! 111: this->hasher->state[i] ^= htonl(iv[i]);
! 112: }
! 113: return TRUE;
! 114: }
! 115:
! 116: METHOD(prf_t, destroy, void,
! 117: private_sha1_prf_t *this)
! 118: {
! 119: this->hasher->public.hasher_interface.destroy(&this->hasher->public.hasher_interface);
! 120: free(this);
! 121: }
! 122:
! 123: /**
! 124: * see header
! 125: */
! 126: sha1_prf_t *sha1_prf_create(pseudo_random_function_t algo)
! 127: {
! 128: private_sha1_prf_t *this;
! 129:
! 130: if (algo != PRF_KEYED_SHA1)
! 131: {
! 132: return NULL;
! 133: }
! 134:
! 135: INIT(this,
! 136: .public = {
! 137: .prf_interface = {
! 138: .get_bytes = _get_bytes,
! 139: .allocate_bytes = _allocate_bytes,
! 140: .get_block_size = _get_block_size,
! 141: .get_key_size = _get_key_size,
! 142: .set_key = _set_key,
! 143: .destroy = _destroy,
! 144: },
! 145: },
! 146: .hasher = (private_sha1_hasher_t*)sha1_hasher_create(HASH_SHA1),
! 147: );
! 148:
! 149: return &this->public;
! 150: }
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