1 files changed, 140 insertions, 0 deletions
diff --git a/src/crypto_cc.c b/src/crypto_cc.c
new file mode 100644
index 0000000..cf932f6
--- /dev/null
+++ b/src/crypto_cc.c
@@ -0,0 +1,140 @@
+/*
+** SQLCipher
+** http://sqlcipher.net
+**
+** Copyright (c) 2008 - 2013, ZETETIC LLC
+** All rights reserved.
+**
+** 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_CC
+#include "crypto.h"
+#include "sqlcipher.h"
+#include <CommonCrypto/CommonCrypto.h>
+#include <Security/SecRandom.h>
+
+/* generate a defined number of random bytes */
+static int sqlcipher_cc_random (void *ctx, void *buffer, int length) {
+  return (SecRandomCopyBytes(kSecRandomDefault, length, (uint8_t *)buffer) == 0) ? SQLITE_OK : SQLITE_ERROR;
+}
+
+static const char* sqlcipher_cc_get_provider_name(void *ctx) {
+  return "commoncrypto";
+}
+
+static int sqlcipher_cc_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) {
+  CCHmacContext hmac_context;
+  CCHmacInit(&hmac_context, kCCHmacAlgSHA1, hmac_key, key_sz);
+  CCHmacUpdate(&hmac_context, in, in_sz);
+  CCHmacUpdate(&hmac_context, in2, in2_sz);
+  CCHmacFinal(&hmac_context, out);
+  return SQLITE_OK; 
+}
+
+static int sqlcipher_cc_kdf(void *ctx, const char *pass, int pass_sz, unsigned char* salt, int salt_sz, int workfactor, int key_sz, unsigned char *key) {
+  CCKeyDerivationPBKDF(kCCPBKDF2, pass, pass_sz, salt, salt_sz, kCCPRFHmacAlgSHA1, workfactor, key, key_sz);
+  return SQLITE_OK; 
+}
+
+static int sqlcipher_cc_cipher(void *ctx, int mode, unsigned char *key, int key_sz, unsigned char *iv, unsigned char *in, int in_sz, unsigned char *out) {
+  CCCryptorRef cryptor;
+  size_t tmp_csz, csz;
+  CCOperation op = mode == CIPHER_ENCRYPT ? kCCEncrypt : kCCDecrypt;
+
+  CCCryptorCreate(op, kCCAlgorithmAES128, 0, key, kCCKeySizeAES256, iv, &cryptor);
+  CCCryptorUpdate(cryptor, in, in_sz, out, in_sz, &tmp_csz);
+  csz = tmp_csz;
+  out += tmp_csz;
+  CCCryptorFinal(cryptor, out, in_sz - csz, &tmp_csz);
+  csz += tmp_csz;
+  CCCryptorRelease(cryptor);
+  assert(size == csz);
+
+  return SQLITE_OK; 
+}
+
+static int sqlcipher_cc_set_cipher(void *ctx, const char *cipher_name) {
+  return SQLITE_OK;
+}
+
+static const char* sqlcipher_cc_get_cipher(void *ctx) {
+  return "aes-256-cbc";
+}
+
+static int sqlcipher_cc_get_key_sz(void *ctx) {
+  return kCCKeySizeAES256;
+}
+
+static int sqlcipher_cc_get_iv_sz(void *ctx) {
+  return kCCBlockSizeAES128;
+}
+
+static int sqlcipher_cc_get_block_sz(void *ctx) {
+  return kCCBlockSizeAES128;
+}
+
+static int sqlcipher_cc_get_hmac_sz(void *ctx) {
+  return CC_SHA1_DIGEST_LENGTH;
+}
+
+static int sqlcipher_cc_ctx_copy(void *target_ctx, void *source_ctx) {
+  return SQLITE_OK;
+}
+
+static int sqlcipher_cc_ctx_cmp(void *c1, void *c2) {
+  return SQLITE_OK;
+}
+
+static int sqlcipher_cc_ctx_init(void **ctx) {
+  return SQLITE_OK;
+}
+
+static int sqlcipher_cc_ctx_free(void **ctx) {
+  return SQLITE_OK;
+}
+
+int sqlcipher_cc_setup(sqlcipher_provider *p) {
+  p->random = sqlcipher_cc_random;
+  p->get_provider_name = sqlcipher_cc_get_provider_name;
+  p->hmac = sqlcipher_cc_hmac;
+  p->kdf = sqlcipher_cc_kdf;
+  p->cipher = sqlcipher_cc_cipher;
+  p->set_cipher = sqlcipher_cc_set_cipher;
+  p->get_cipher = sqlcipher_cc_get_cipher;
+  p->get_key_sz = sqlcipher_cc_get_key_sz;
+  p->get_iv_sz = sqlcipher_cc_get_iv_sz;
+  p->get_block_sz = sqlcipher_cc_get_block_sz;
+  p->get_hmac_sz = sqlcipher_cc_get_hmac_sz;
+  p->ctx_copy = sqlcipher_cc_ctx_copy;
+  p->ctx_cmp = sqlcipher_cc_ctx_cmp;
+  p->ctx_init = sqlcipher_cc_ctx_init;
+  p->ctx_free = sqlcipher_cc_ctx_free;
+  return SQLITE_OK;
+}
+
+#endif
+#endif
+/* END SQLCIPHER */