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+/* 
+** SQLCipher
+** crypto.h developed by Stephen Lombardo (Zetetic LLC) 
+** sjlombardo at zetetic dot net
+** http://zetetic.net
+** 
+** Copyright (c) 2008, 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 CRYPTO */
+#ifdef SQLITE_HAS_CODEC
+#ifndef CRYPTO_H
+#define CRYPTO_H
+
+#define FILE_HEADER_SZ 16
+
+#ifndef CIPHER
+#define CIPHER "aes-256-cbc"
+#endif
+
+#define CIPHER_DECRYPT 0
+#define CIPHER_ENCRYPT 1
+
+#define CIPHER_READ_CTX 0
+#define CIPHER_WRITE_CTX 1
+#define CIPHER_READWRITE_CTX 2
+
+#ifndef PBKDF2_ITER
+#define PBKDF2_ITER 4000
+#endif
+
+#ifndef DEFAULT_USE_HMAC
+#define DEFAULT_USE_HMAC 1
+#endif
+
+/* by default, sqlcipher will use a reduced number of iterations to generate
+   the HMAC key / or transform a raw cipher key 
+   */
+#ifndef FAST_PBKDF2_ITER
+#define FAST_PBKDF2_ITER 2
+#endif
+
+/* this if a fixed random array that will be xor'd with the database salt to ensure that the
+   salt passed to the HMAC key derivation function is not the same as that used to derive
+   the encryption key. This can be overridden at compile time but it will make the resulting
+   binary incompatible with the default builds when using HMAC. A future version of SQLcipher
+   will likely allow this to be defined at runtime via pragma */ 
+#ifndef HMAC_SALT_MASK
+#define HMAC_SALT_MASK 0x3a
+#endif
+
+#ifdef CODEC_DEBUG
+#define CODEC_TRACE(X)  {printf X;fflush(stdout);}
+#else
+#define CODEC_TRACE(X)
+#endif
+
+
+/* extensions defined in pragma.c */ 
+   
+void sqlite3pager_get_codec(Pager *pPager, void **ctx);
+int sqlite3pager_is_mj_pgno(Pager *pPager, Pgno pgno);
+sqlite3_file *sqlite3Pager_get_fd(Pager *pPager);
+void sqlite3pager_sqlite3PagerSetCodec(
+  Pager *pPager,
+  void *(*xCodec)(void*,void*,Pgno,int),
+  void (*xCodecSizeChng)(void*,int,int),
+  void (*xCodecFree)(void*),
+  void *pCodec
+);
+/* end extensions defined in pragma.c */
+ 
+/*
+**  Simple shared routines for converting hex char strings to binary data
+ */
+static int cipher_hex2int(char c) {
+  return (c>='0' && c<='9') ? (c)-'0' :
+         (c>='A' && c<='F') ? (c)-'A'+10 :
+         (c>='a' && c<='f') ? (c)-'a'+10 : 0;
+}
+
+static void cipher_hex2bin(const char *hex, int sz, unsigned char *out){
+  int i;
+  for(i = 0; i < sz; i += 2){
+    out[i/2] = (cipher_hex2int(hex[i])<<4) | cipher_hex2int(hex[i+1]);
+  }
+}
+
+/* extensions defined in crypto_impl.c */
+
+typedef struct codec_ctx codec_ctx;
+
+/* utility functions */
+int sqlcipher_memcmp(const unsigned char *a0, const unsigned char *a1, int len);
+int sqlcipher_pseudorandom(void *, int);
+void sqlcipher_free(void *, int);
+
+/* activation and initialization */
+void sqlcipher_activate();
+int sqlcipher_codec_ctx_init(codec_ctx **, Db *, Pager *, sqlite3_file *, const void *, int);
+void sqlcipher_codec_ctx_free(codec_ctx **);
+int sqlcipher_codec_key_derive(codec_ctx *);
+int sqlcipher_codec_key_copy(codec_ctx *, int);
+
+/* page cipher implementation */
+int sqlcipher_page_cipher(codec_ctx *, int, Pgno, int, int, unsigned char *, unsigned char *);
+
+/* context setters & getters */
+void sqlcipher_codec_ctx_set_error(codec_ctx *, int);
+
+int sqlcipher_codec_ctx_set_pass(codec_ctx *, const void *, int, int);
+void sqlcipher_codec_get_pass(codec_ctx *, void **zKey, int *nKey);
+
+int sqlcipher_codec_ctx_set_pagesize(codec_ctx *, int);
+int sqlcipher_codec_ctx_get_pagesize(codec_ctx *);
+int sqlcipher_codec_ctx_get_reservesize(codec_ctx *);
+
+int sqlcipher_codec_ctx_set_kdf_iter(codec_ctx *, int, int);
+void* sqlcipher_codec_ctx_get_kdf_salt(codec_ctx *ctx);
+
+int sqlcipher_codec_ctx_set_fast_kdf_iter(codec_ctx *, int, int);
+
+int sqlcipher_codec_ctx_set_cipher(codec_ctx *, const char *, int);
+
+void* sqlcipher_codec_ctx_get_data(codec_ctx *);
+
+void sqlcipher_exportFunc(sqlite3_context *, int, sqlite3_value **);
+
+int sqlcipher_codec_ctx_set_use_hmac(codec_ctx *ctx, int use);
+/* end extensions defined in crypto_impl.c */
+
+#endif
+#endif
+/* END CRYPTO */