sqlcipher/src/crypto_libtomcrypt.c at Xcode5 · securitykernel/sqlcipher · GitHub

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** SQLCipher

** http://sqlcipher.net

** Redistribution and use in source and binary forms, with or without

** modification, are permitted provided that the following conditions are met:

** * Redistributions of source code must retain the above copyright

** notice, this list of conditions and the following disclaimer.

** * Redistributions in binary form must reproduce the above copyright

** notice, this list of conditions and the following disclaimer in the

** documentation and/or other materials provided with the distribution.

** * Neither the name of the ZETETIC LLC nor the

** names of its contributors may be used to endorse or promote products

** derived from this software without specific prior written permission.

** THIS SOFTWARE IS PROVIDED BY ZETETIC LLC ''AS IS'' AND ANY

** EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

** WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

** DISCLAIMED. IN NO EVENT SHALL ZETETIC LLC BE LIABLE FOR ANY

** DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

** (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

** ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

** SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

/* BEGIN SQLCIPHER */

#ifdef SQLITE_HAS_CODEC

#ifdef SQLCIPHER_CRYPTO_LIBTOMCRYPT

#include "sqliteInt.h"

#include "sqlcipher.h"

#include <tomcrypt.h>

typedef struct {

prng_state prng;

} ltc_ctx;

static unsigned int ltc_init = 0;

static int sqlcipher_ltc_add_random(void *ctx, void *buffer, int length) {

ltc_ctx *ltc = (ltc_ctx*)ctx;

int rc = fortuna_add_entropy(buffer, length, &(ltc->prng));

return rc != CRYPT_OK ? SQLITE_ERROR : SQLITE_OK;

}

static int sqlcipher_ltc_activate(void *ctx) {

ltc_ctx *ltc = (ltc_ctx*)ctx;

int random_buffer_sz = 32;

unsigned char random_buffer[random_buffer_sz];

if(ltc_init == 0) {

if(register_prng(&fortuna_desc) != CRYPT_OK) return SQLITE_ERROR;

if(register_cipher(&rijndael_desc) != CRYPT_OK) return SQLITE_ERROR;

if(register_hash(&sha1_desc) != CRYPT_OK) return SQLITE_ERROR;

ltc_init = 1;

}

if(fortuna_start(&(ltc->prng)) != CRYPT_OK) {

return SQLITE_ERROR;

}

sqlite3_randomness(random_buffer_sz, &random_buffer);

if(sqlcipher_ltc_add_random(ctx, random_buffer, random_buffer_sz) != SQLITE_OK) {

return SQLITE_ERROR;

}

if(sqlcipher_ltc_add_random(ctx, &ltc, sizeof(ltc_ctx*)) != SQLITE_OK) {

return SQLITE_ERROR;

}

if(fortuna_ready(&(ltc->prng)) != CRYPT_OK) {

return SQLITE_ERROR;

}

return SQLITE_OK;

}

static int sqlcipher_ltc_deactivate(void *ctx) {

ltc_ctx *ltc = (ltc_ctx*)ctx;

fortuna_done(&(ltc->prng));

}

static const char* sqlcipher_ltc_get_provider_name(void *ctx) {

return "libtomcrypt";

}

static int sqlcipher_ltc_random(void *ctx, void *buffer, int length) {

ltc_ctx *ltc = (ltc_ctx*)ctx;

int rc;

if((rc = fortuna_ready(&(ltc->prng))) != CRYPT_OK) {

return SQLITE_ERROR;

}

fortuna_read(buffer, length, &(ltc->prng));

return SQLITE_OK;

}

static int sqlcipher_ltc_hmac(void *ctx, unsigned char *hmac_key, int key_sz, unsigned char *in, int in_sz, unsigned char *in2, int in2_sz, unsigned char *out) {

int rc, hash_idx;

hmac_state hmac;

unsigned long outlen = key_sz;

hash_idx = find_hash("sha1");

if((rc = hmac_init(&hmac, hash_idx, hmac_key, key_sz)) != CRYPT_OK) return SQLITE_ERROR;

if((rc = hmac_process(&hmac, in, in_sz)) != CRYPT_OK) return SQLITE_ERROR;

if((rc = hmac_process(&hmac, in2, in2_sz)) != CRYPT_OK) return SQLITE_ERROR;

if((rc = hmac_done(&hmac, out, &outlen)) != CRYPT_OK) return SQLITE_ERROR;

return SQLITE_OK;

}

static int sqlcipher_ltc_kdf(void *ctx, const char *pass, int pass_sz, unsigned char* salt, int salt_sz, int workfactor, int key_sz, unsigned char *key) {

int rc, hash_idx;

unsigned long outlen = key_sz;

unsigned long random_buffer_sz = 256;

char random_buffer[random_buffer_sz];

ltc_ctx *ltc = (ltc_ctx*)ctx;

hash_idx = find_hash("sha1");

if((rc = pkcs_5_alg2(pass, pass_sz, salt, salt_sz,

workfactor, hash_idx, key, &outlen)) != CRYPT_OK) {

return SQLITE_ERROR;

}

if((rc = pkcs_5_alg2(key, key_sz, salt, salt_sz,

1, hash_idx, random_buffer, &random_buffer_sz)) != CRYPT_OK) {

return SQLITE_ERROR;

}

sqlcipher_ltc_add_random(ctx, random_buffer, random_buffer_sz);

return SQLITE_OK;

}

static const char* sqlcipher_ltc_get_cipher(void *ctx) {

return "rijndael";

}

static int sqlcipher_ltc_cipher(void *ctx, int mode, unsigned char *key, int key_sz, unsigned char *iv, unsigned char *in, int in_sz, unsigned char *out) {

int rc, cipher_idx, hash_idx;

symmetric_CBC cbc;

if((cipher_idx = find_cipher(sqlcipher_ltc_get_cipher(ctx))) == -1) return SQLITE_ERROR;

if((rc = cbc_start(cipher_idx, iv, key, key_sz, 0, &cbc)) != CRYPT_OK) return SQLITE_ERROR;

rc = mode == 1 ? cbc_encrypt(in, out, in_sz, &cbc) : cbc_decrypt(in, out, in_sz, &cbc);

if(rc != CRYPT_OK) return SQLITE_ERROR;

cbc_done(&cbc);

return SQLITE_OK;

}

static int sqlcipher_ltc_set_cipher(void *ctx, const char *cipher_name) {

return SQLITE_OK;

}

static int sqlcipher_ltc_get_key_sz(void *ctx) {

int cipher_idx = find_cipher(sqlcipher_ltc_get_cipher(ctx));

return cipher_descriptor[cipher_idx].max_key_length;

}

static int sqlcipher_ltc_get_iv_sz(void *ctx) {

int cipher_idx = find_cipher(sqlcipher_ltc_get_cipher(ctx));

return cipher_descriptor[cipher_idx].block_length;

}

static int sqlcipher_ltc_get_block_sz(void *ctx) {

int cipher_idx = find_cipher(sqlcipher_ltc_get_cipher(ctx));

return cipher_descriptor[cipher_idx].block_length;

}

static int sqlcipher_ltc_get_hmac_sz(void *ctx) {

int hash_idx = find_hash("sha1");

return hash_descriptor[hash_idx].hashsize;

}

static int sqlcipher_ltc_ctx_copy(void *target_ctx, void *source_ctx) {

memcpy(target_ctx, source_ctx, sizeof(ltc_ctx));

return SQLITE_OK;

}

static int sqlcipher_ltc_ctx_cmp(void *c1, void *c2) {

return 1;

}

static int sqlcipher_ltc_ctx_init(void **ctx) {

*ctx = sqlcipher_malloc(sizeof(ltc_ctx));

if(*ctx == NULL) return SQLITE_NOMEM;

sqlcipher_ltc_activate(*ctx);

return SQLITE_OK;

}

static int sqlcipher_ltc_ctx_free(void **ctx) {

sqlcipher_ltc_deactivate(&ctx);

sqlcipher_free(*ctx, sizeof(ltc_ctx));

return SQLITE_OK;

}

int sqlcipher_ltc_setup(sqlcipher_provider *p) {

p->activate = sqlcipher_ltc_activate;

p->deactivate = sqlcipher_ltc_deactivate;

p->get_provider_name = sqlcipher_ltc_get_provider_name;

p->random = sqlcipher_ltc_random;

p->hmac = sqlcipher_ltc_hmac;

p->kdf = sqlcipher_ltc_kdf;

p->cipher = sqlcipher_ltc_cipher;

p->set_cipher = sqlcipher_ltc_set_cipher;

p->get_cipher = sqlcipher_ltc_get_cipher;

p->get_key_sz = sqlcipher_ltc_get_key_sz;

p->get_iv_sz = sqlcipher_ltc_get_iv_sz;

p->get_block_sz = sqlcipher_ltc_get_block_sz;

p->get_hmac_sz = sqlcipher_ltc_get_hmac_sz;

p->ctx_copy = sqlcipher_ltc_ctx_copy;

p->ctx_cmp = sqlcipher_ltc_ctx_cmp;

p->ctx_init = sqlcipher_ltc_ctx_init;

p->ctx_free = sqlcipher_ltc_ctx_free;

p->add_random = sqlcipher_ltc_add_random;

}

#endif

/* END SQLCIPHER */

sqlcipher/src/crypto_libtomcrypt.c at Xcode5 · securitykernel/sqlcipher · GitHub

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