diff options
Diffstat (limited to 'src/libstrongswan/plugins/gcrypt/gcrypt_hasher.c')
| -rw-r--r-- | src/libstrongswan/plugins/gcrypt/gcrypt_hasher.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/src/libstrongswan/plugins/gcrypt/gcrypt_hasher.c b/src/libstrongswan/plugins/gcrypt/gcrypt_hasher.c new file mode 100644 index 000000000..785ebda90 --- /dev/null +++ b/src/libstrongswan/plugins/gcrypt/gcrypt_hasher.c @@ -0,0 +1,151 @@ +/* + * Copyright (C) 2009 Martin Willi + * Hochschule fuer Technik Rapperswil + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +#include "gcrypt_hasher.h" + +#include <debug.h> + +#include <gcrypt.h> + +typedef struct private_gcrypt_hasher_t private_gcrypt_hasher_t; + +/** + * Private data of gcrypt_hasher_t + */ +struct private_gcrypt_hasher_t { + + /** + * Public part of this class. + */ + gcrypt_hasher_t public; + + /** + * gcrypt hasher context + */ + gcry_md_hd_t hd; +}; + +/** + * Implementation of hasher_t.get_hash_size. + */ +static size_t get_hash_size(private_gcrypt_hasher_t *this) +{ + return gcry_md_get_algo_dlen(gcry_md_get_algo(this->hd)); +} + +/** + * Implementation of hasher_t.reset. + */ +static void reset(private_gcrypt_hasher_t *this) +{ + gcry_md_reset(this->hd); +} + +/** + * Implementation of hasher_t.get_hash. + */ +static void get_hash(private_gcrypt_hasher_t *this, chunk_t chunk, + u_int8_t *hash) +{ + gcry_md_write(this->hd, chunk.ptr, chunk.len); + if (hash) + { + memcpy(hash, gcry_md_read(this->hd, 0), get_hash_size(this)); + gcry_md_reset(this->hd); + } +} + +/** + * Implementation of hasher_t.allocate_hash. + */ +static void allocate_hash(private_gcrypt_hasher_t *this, chunk_t chunk, + chunk_t *hash) +{ + if (hash) + { + *hash = chunk_alloc(get_hash_size(this)); + get_hash(this, chunk, hash->ptr); + } + else + { + get_hash(this, chunk, NULL); + } +} + +/** + * Implementation of hasher_t.destroy. + */ +static void destroy (private_gcrypt_hasher_t *this) +{ + gcry_md_close(this->hd); + free(this); +} + +/* + * Described in header + */ +gcrypt_hasher_t *gcrypt_hasher_create(hash_algorithm_t algo) +{ + private_gcrypt_hasher_t *this; + int gcrypt_alg; + gcry_error_t err; + + switch (algo) + { + case HASH_MD2: + gcrypt_alg = GCRY_MD_MD2; + break; + case HASH_MD4: + gcrypt_alg = GCRY_MD_MD4; + break; + case HASH_MD5: + gcrypt_alg = GCRY_MD_MD5; + break; + case HASH_SHA1: + gcrypt_alg = GCRY_MD_SHA1; + break; + case HASH_SHA256: + gcrypt_alg = GCRY_MD_SHA256; + break; + case HASH_SHA384: + gcrypt_alg = GCRY_MD_SHA384; + break; + case HASH_SHA512: + gcrypt_alg = GCRY_MD_SHA512; + break; + default: + return NULL; + } + + this = malloc_thing(private_gcrypt_hasher_t); + + err = gcry_md_open(&this->hd, gcrypt_alg, 0); + if (err) + { + DBG1("grcy_md_open(%N) failed: %s", + hash_algorithm_names, algo, gpg_strerror(err)); + free(this); + return NULL; + } + + this->public.hasher_interface.get_hash = (void (*) (hasher_t*, chunk_t, u_int8_t*))get_hash; + this->public.hasher_interface.allocate_hash = (void (*) (hasher_t*, chunk_t, chunk_t*))allocate_hash; + this->public.hasher_interface.get_hash_size = (size_t (*) (hasher_t*))get_hash_size; + this->public.hasher_interface.reset = (void (*) (hasher_t*))reset; + this->public.hasher_interface.destroy = (void (*) (hasher_t*))destroy; + + return &this->public; +} + |