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crypto.c
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/*
** 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
#include <assert.h>
#include "sqlcipher.h"
#include "crypto.h"
#ifdef SQLCIPHER_LICENSE
#include "sqlcipher-license.h"
#endif
/* Generate code to return a string value */
static void codec_vdbe_return_string(Parse *pParse, const char *zLabel, const char *value, int value_type){
Vdbe *v = sqlite3GetVdbe(pParse);
sqlite3VdbeSetNumCols(v, 1);
sqlite3VdbeSetColName(v, 0, COLNAME_NAME, zLabel, SQLITE_STATIC);
sqlite3VdbeAddOp4(v, OP_String8, 0, 1, 0, value, value_type);
sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 1);
}
static int codec_set_btree_to_codec_pagesize(sqlite3 *db, Db *pDb, codec_ctx *ctx) {
int rc, page_sz, reserve_sz;
page_sz = sqlcipher_codec_ctx_get_pagesize(ctx);
reserve_sz = sqlcipher_codec_ctx_get_reservesize(ctx);
CODEC_TRACE("codec_set_btree_to_codec_pagesize: sqlite3BtreeSetPageSize() size=%d reserve=%d\n", page_sz, reserve_sz);
CODEC_TRACE_MUTEX("codec_set_btree_to_codec_pagesize: entering database mutex %p\n", db->mutex);
sqlite3_mutex_enter(db->mutex);
CODEC_TRACE_MUTEX("codec_set_btree_to_codec_pagesize: entered database mutex %p\n", db->mutex);
db->nextPagesize = page_sz;
/* before forcing the page size we need to unset the BTS_PAGESIZE_FIXED flag, else
sqliteBtreeSetPageSize will block the change */
pDb->pBt->pBt->btsFlags &= ~BTS_PAGESIZE_FIXED;
rc = sqlite3BtreeSetPageSize(pDb->pBt, page_sz, reserve_sz, 0);
CODEC_TRACE("codec_set_btree_to_codec_pagesize: sqlite3BtreeSetPageSize returned %d\n", rc);
CODEC_TRACE_MUTEX("codec_set_btree_to_codec_pagesize: leaving database mutex %p\n", db->mutex);
sqlite3_mutex_leave(db->mutex);
CODEC_TRACE_MUTEX("codec_set_btree_to_codec_pagesize: left database mutex %p\n", db->mutex);
return rc;
}
static int codec_set_pass_key(sqlite3* db, int nDb, const void *zKey, int nKey, int for_ctx) {
struct Db *pDb = &db->aDb[nDb];
CODEC_TRACE("codec_set_pass_key: entered db=%p nDb=%d zKey=%s nKey=%d for_ctx=%d\n", db, nDb, (char *)zKey, nKey, for_ctx);
if(pDb->pBt) {
codec_ctx *ctx = (codec_ctx*) sqlite3PagerGetCodec(pDb->pBt->pBt->pPager);
if(ctx) return sqlcipher_codec_ctx_set_pass(ctx, zKey, nKey, for_ctx);
}
return SQLITE_ERROR;
}
int sqlcipher_codec_pragma(sqlite3* db, int iDb, Parse *pParse, const char *zLeft, const char *zRight) {
struct Db *pDb = &db->aDb[iDb];
codec_ctx *ctx = NULL;
int rc;
if(pDb->pBt) {
ctx = (codec_ctx*) sqlite3PagerGetCodec(pDb->pBt->pBt->pPager);
}
CODEC_TRACE("sqlcipher_codec_pragma: entered db=%p iDb=%d pParse=%p zLeft=%s zRight=%s ctx=%p\n", db, iDb, pParse, zLeft, zRight, ctx);
#ifdef SQLCIPHER_LICENSE
if( sqlite3StrICmp(zLeft, "cipher_license")==0 && zRight ){
char *license_result = sqlite3_mprintf("%d", sqlcipher_license_key(zRight));
codec_vdbe_return_string(pParse, "cipher_license", license_result, P4_DYNAMIC);
} else
if( sqlite3StrICmp(zLeft, "cipher_license")==0 && !zRight ){
if(ctx) {
char *license_result = sqlite3_mprintf("%d", ctx
? sqlcipher_license_key_status(ctx)
: SQLITE_ERROR);
codec_vdbe_return_string(pParse, "cipher_license", license_result, P4_DYNAMIC);
}
} else
#endif
if( sqlite3StrICmp(zLeft, "cipher_fips_status")== 0 && !zRight ){
if(ctx) {
char *fips_mode_status = sqlite3_mprintf("%d", sqlcipher_codec_fips_status(ctx));
codec_vdbe_return_string(pParse, "cipher_fips_status", fips_mode_status, P4_DYNAMIC);
}
} else
if( sqlite3StrICmp(zLeft, "cipher_store_pass")==0 && zRight ) {
if(ctx) {
sqlcipher_codec_set_store_pass(ctx, sqlite3GetBoolean(zRight, 1));
}
} else
if( sqlite3StrICmp(zLeft, "cipher_store_pass")==0 && !zRight ) {
if(ctx){
char *store_pass_value = sqlite3_mprintf("%d", sqlcipher_codec_get_store_pass(ctx));
codec_vdbe_return_string(pParse, "cipher_store_pass", store_pass_value, P4_DYNAMIC);
}
}
if( sqlite3StrICmp(zLeft, "cipher_profile")== 0 && zRight ){
char *profile_status = sqlite3_mprintf("%d", sqlcipher_cipher_profile(db, zRight));
codec_vdbe_return_string(pParse, "cipher_profile", profile_status, P4_DYNAMIC);
} else
if( sqlite3StrICmp(zLeft, "cipher_add_random")==0 && zRight ){
if(ctx) {
char *add_random_status = sqlite3_mprintf("%d", sqlcipher_codec_add_random(ctx, zRight, sqlite3Strlen30(zRight)));
codec_vdbe_return_string(pParse, "cipher_add_random", add_random_status, P4_DYNAMIC);
}
} else
if( sqlite3StrICmp(zLeft, "cipher_migrate")==0 && !zRight ){
if(ctx){
char *migrate_status = sqlite3_mprintf("%d", sqlcipher_codec_ctx_migrate(ctx));
codec_vdbe_return_string(pParse, "cipher_migrate", migrate_status, P4_DYNAMIC);
}
} else
if( sqlite3StrICmp(zLeft, "cipher_provider")==0 && !zRight ){
if(ctx) { codec_vdbe_return_string(pParse, "cipher_provider",
sqlcipher_codec_get_cipher_provider(ctx), P4_TRANSIENT);
}
} else
if( sqlite3StrICmp(zLeft, "cipher_provider_version")==0 && !zRight){
if(ctx) { codec_vdbe_return_string(pParse, "cipher_provider_version",
sqlcipher_codec_get_provider_version(ctx), P4_TRANSIENT);
}
} else
if( sqlite3StrICmp(zLeft, "cipher_version")==0 && !zRight ){
#ifdef CIPHER_VERSION_QUALIFIER
char *version = sqlite3_mprintf("%s %s %s", CIPHER_XSTR(CIPHER_VERSION_NUMBER), CIPHER_XSTR(CIPHER_VERSION_QUALIFIER), CIPHER_XSTR(CIPHER_VERSION_BUILD));
#else
char *version = sqlite3_mprintf("%s %s", CIPHER_XSTR(CIPHER_VERSION_NUMBER), CIPHER_XSTR(CIPHER_VERSION_BUILD));
#endif
codec_vdbe_return_string(pParse, "cipher_version", version, P4_DYNAMIC);
}else
if( sqlite3StrICmp(zLeft, "cipher")==0 ){
if(ctx) {
if( zRight ) {
const char* message = "PRAGMA cipher is no longer supported.";
codec_vdbe_return_string(pParse, "cipher", message, P4_TRANSIENT);
sqlite3_log(SQLITE_WARNING, message);
}else {
codec_vdbe_return_string(pParse, "cipher", sqlcipher_codec_ctx_get_cipher(ctx), P4_TRANSIENT);
}
}
}else
if( sqlite3StrICmp(zLeft, "rekey_cipher")==0 && zRight ){
const char* message = "PRAGMA rekey_cipher is no longer supported.";
codec_vdbe_return_string(pParse, "rekey_cipher", message, P4_TRANSIENT);
sqlite3_log(SQLITE_WARNING, message);
}else
if( sqlite3StrICmp(zLeft,"cipher_default_kdf_iter")==0 ){
if( zRight ) {
sqlcipher_set_default_kdf_iter(atoi(zRight)); /* change default KDF iterations */
} else {
char *kdf_iter = sqlite3_mprintf("%d", sqlcipher_get_default_kdf_iter());
codec_vdbe_return_string(pParse, "cipher_default_kdf_iter", kdf_iter, P4_DYNAMIC);
}
}else
if( sqlite3StrICmp(zLeft, "kdf_iter")==0 ){
if(ctx) {
if( zRight ) {
sqlcipher_codec_ctx_set_kdf_iter(ctx, atoi(zRight)); /* change of RW PBKDF2 iteration */
} else {
char *kdf_iter = sqlite3_mprintf("%d", sqlcipher_codec_ctx_get_kdf_iter(ctx));
codec_vdbe_return_string(pParse, "kdf_iter", kdf_iter, P4_DYNAMIC);
}
}
}else
if( sqlite3StrICmp(zLeft, "fast_kdf_iter")==0){
if(ctx) {
if( zRight ) {
char *deprecation = "PRAGMA fast_kdf_iter is deprecated, please remove from use";
sqlcipher_codec_ctx_set_fast_kdf_iter(ctx, atoi(zRight)); /* change of RW PBKDF2 iteration */
codec_vdbe_return_string(pParse, "fast_kdf_iter", deprecation, P4_TRANSIENT);
sqlite3_log(SQLITE_WARNING, deprecation);
} else {
char *fast_kdf_iter = sqlite3_mprintf("%d", sqlcipher_codec_ctx_get_fast_kdf_iter(ctx));
codec_vdbe_return_string(pParse, "fast_kdf_iter", fast_kdf_iter, P4_DYNAMIC);
}
}
}else
if( sqlite3StrICmp(zLeft, "rekey_kdf_iter")==0 && zRight ){
const char* message = "PRAGMA rekey_kdf_iter is no longer supported.";
codec_vdbe_return_string(pParse, "rekey_kdf_iter", message, P4_TRANSIENT);
sqlite3_log(SQLITE_WARNING, message);
}else
if( sqlite3StrICmp(zLeft,"cipher_page_size")==0 ){
if(ctx) {
if( zRight ) {
int size = atoi(zRight);
rc = sqlcipher_codec_ctx_set_pagesize(ctx, size);
if(rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, rc);
rc = codec_set_btree_to_codec_pagesize(db, pDb, ctx);
if(rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, rc);
} else {
char * page_size = sqlite3_mprintf("%d", sqlcipher_codec_ctx_get_pagesize(ctx));
codec_vdbe_return_string(pParse, "cipher_page_size", page_size, P4_DYNAMIC);
}
}
}else
if( sqlite3StrICmp(zLeft,"cipher_default_page_size")==0 ){
if( zRight ) {
sqlcipher_set_default_pagesize(atoi(zRight));
} else {
char *default_page_size = sqlite3_mprintf("%d", sqlcipher_get_default_pagesize());
codec_vdbe_return_string(pParse, "cipher_default_page_size", default_page_size, P4_DYNAMIC);
}
}else
if( sqlite3StrICmp(zLeft,"cipher_default_use_hmac")==0 ){
if( zRight ) {
sqlcipher_set_default_use_hmac(sqlite3GetBoolean(zRight,1));
} else {
char *default_use_hmac = sqlite3_mprintf("%d", sqlcipher_get_default_use_hmac());
codec_vdbe_return_string(pParse, "cipher_default_use_hmac", default_use_hmac, P4_DYNAMIC);
}
}else
if( sqlite3StrICmp(zLeft,"cipher_use_hmac")==0 ){
if(ctx) {
if( zRight ) {
rc = sqlcipher_codec_ctx_set_use_hmac(ctx, sqlite3GetBoolean(zRight,1));
if(rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, rc);
/* since the use of hmac has changed, the page size may also change */
rc = codec_set_btree_to_codec_pagesize(db, pDb, ctx);
if(rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, rc);
} else {
char *hmac_flag = sqlite3_mprintf("%d", sqlcipher_codec_ctx_get_use_hmac(ctx));
codec_vdbe_return_string(pParse, "cipher_use_hmac", hmac_flag, P4_DYNAMIC);
}
}
}else
if( sqlite3StrICmp(zLeft,"cipher_hmac_pgno")==0 ){
if(ctx) {
if(zRight) {
char *deprecation = "PRAGMA cipher_hmac_pgno is deprecated, please remove from use";
/* clear both pgno endian flags */
if(sqlite3StrICmp(zRight, "le") == 0) {
sqlcipher_codec_ctx_unset_flag(ctx, CIPHER_FLAG_BE_PGNO);
sqlcipher_codec_ctx_set_flag(ctx, CIPHER_FLAG_LE_PGNO);
} else if(sqlite3StrICmp(zRight, "be") == 0) {
sqlcipher_codec_ctx_unset_flag(ctx, CIPHER_FLAG_LE_PGNO);
sqlcipher_codec_ctx_set_flag(ctx, CIPHER_FLAG_BE_PGNO);
} else if(sqlite3StrICmp(zRight, "native") == 0) {
sqlcipher_codec_ctx_unset_flag(ctx, CIPHER_FLAG_LE_PGNO);
sqlcipher_codec_ctx_unset_flag(ctx, CIPHER_FLAG_BE_PGNO);
}
codec_vdbe_return_string(pParse, "cipher_hmac_pgno", deprecation, P4_TRANSIENT);
sqlite3_log(SQLITE_WARNING, deprecation);
} else {
if(sqlcipher_codec_ctx_get_flag(ctx, CIPHER_FLAG_LE_PGNO)) {
codec_vdbe_return_string(pParse, "cipher_hmac_pgno", "le", P4_TRANSIENT);
} else if(sqlcipher_codec_ctx_get_flag(ctx, CIPHER_FLAG_BE_PGNO)) {
codec_vdbe_return_string(pParse, "cipher_hmac_pgno", "be", P4_TRANSIENT);
} else {
codec_vdbe_return_string(pParse, "cipher_hmac_pgno", "native", P4_TRANSIENT);
}
}
}
}else
if( sqlite3StrICmp(zLeft,"cipher_hmac_salt_mask")==0 ){
if(ctx) {
if(zRight) {
char *deprecation = "PRAGMA cipher_hmac_salt_mask is deprecated, please remove from use";
if (sqlite3StrNICmp(zRight ,"x'", 2) == 0 && sqlite3Strlen30(zRight) == 5) {
unsigned char mask = 0;
const unsigned char *hex = (const unsigned char *)zRight+2;
cipher_hex2bin(hex,2,&mask);
sqlcipher_set_hmac_salt_mask(mask);
}
codec_vdbe_return_string(pParse, "cipher_hmac_salt_mask", deprecation, P4_TRANSIENT);
sqlite3_log(SQLITE_WARNING, deprecation);
} else {
char *hmac_salt_mask = sqlite3_mprintf("%02x", sqlcipher_get_hmac_salt_mask());
codec_vdbe_return_string(pParse, "cipher_hmac_salt_mask", hmac_salt_mask, P4_DYNAMIC);
}
}
}else
if( sqlite3StrICmp(zLeft,"cipher_plaintext_header_size")==0 ){
if(ctx) {
if( zRight ) {
int size = atoi(zRight);
if((rc = sqlcipher_codec_ctx_set_plaintext_header_size(ctx, size)) != SQLITE_OK)
sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
} else {
char *size = sqlite3_mprintf("%d", sqlcipher_codec_ctx_get_plaintext_header_size(ctx));
codec_vdbe_return_string(pParse, "cipher_plaintext_header_size", size, P4_DYNAMIC);
}
}
}else
if( sqlite3StrICmp(zLeft,"cipher_default_plaintext_header_size")==0 ){
if( zRight ) {
sqlcipher_set_default_plaintext_header_size(atoi(zRight));
} else {
char *size = sqlite3_mprintf("%d", sqlcipher_get_default_plaintext_header_size());
codec_vdbe_return_string(pParse, "cipher_default_plaintext_header_size", size, P4_DYNAMIC);
sqlite3_free(size);
}
}else
if( sqlite3StrICmp(zLeft,"cipher_salt")==0 ){
if(ctx) {
if(zRight) {
if (sqlite3StrNICmp(zRight ,"x'", 2) == 0 && sqlite3Strlen30(zRight) == (FILE_HEADER_SZ*2)+3) {
unsigned char *salt = (unsigned char*) sqlite3_malloc(FILE_HEADER_SZ);
const unsigned char *hex = (const unsigned char *)zRight+2;
cipher_hex2bin(hex,FILE_HEADER_SZ*2,salt);
sqlcipher_codec_ctx_set_kdf_salt(ctx, salt, FILE_HEADER_SZ);
sqlite3_free(salt);
}
} else {
void *salt;
char *hexsalt = (char*) sqlite3_malloc((FILE_HEADER_SZ*2)+1);
if((rc = sqlcipher_codec_ctx_get_kdf_salt(ctx, &salt)) == SQLITE_OK) {
cipher_bin2hex(salt, FILE_HEADER_SZ, hexsalt);
codec_vdbe_return_string(pParse, "cipher_salt", hexsalt, P4_DYNAMIC);
} else {
sqlite3_free(hexsalt);
sqlcipher_codec_ctx_set_error(ctx, rc);
}
}
}
}else
if( sqlite3StrICmp(zLeft,"cipher_hmac_algorithm")==0 ){
if(ctx) {
if(zRight) {
rc = SQLITE_ERROR;
if(sqlite3StrICmp(zRight, SQLCIPHER_HMAC_SHA1_LABEL) == 0) {
rc = sqlcipher_codec_ctx_set_hmac_algorithm(ctx, SQLCIPHER_HMAC_SHA1);
} else if(sqlite3StrICmp(zRight, SQLCIPHER_HMAC_SHA256_LABEL) == 0) {
rc = sqlcipher_codec_ctx_set_hmac_algorithm(ctx, SQLCIPHER_HMAC_SHA256);
} else if(sqlite3StrICmp(zRight, SQLCIPHER_HMAC_SHA512_LABEL) == 0) {
rc = sqlcipher_codec_ctx_set_hmac_algorithm(ctx, SQLCIPHER_HMAC_SHA512);
}
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = codec_set_btree_to_codec_pagesize(db, pDb, ctx);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
} else {
int algorithm = sqlcipher_codec_ctx_get_hmac_algorithm(ctx);
if(algorithm == SQLCIPHER_HMAC_SHA1) {
codec_vdbe_return_string(pParse, "cipher_hmac_algorithm", SQLCIPHER_HMAC_SHA1_LABEL, P4_TRANSIENT);
} else if(algorithm == SQLCIPHER_HMAC_SHA256) {
codec_vdbe_return_string(pParse, "cipher_hmac_algorithm", SQLCIPHER_HMAC_SHA256_LABEL, P4_TRANSIENT);
} else if(algorithm == SQLCIPHER_HMAC_SHA512) {
codec_vdbe_return_string(pParse, "cipher_hmac_algorithm", SQLCIPHER_HMAC_SHA512_LABEL, P4_TRANSIENT);
}
}
}
}else
if( sqlite3StrICmp(zLeft,"cipher_default_hmac_algorithm")==0 ){
if(zRight) {
rc = SQLITE_ERROR;
if(sqlite3StrICmp(zRight, SQLCIPHER_HMAC_SHA1_LABEL) == 0) {
rc = sqlcipher_set_default_hmac_algorithm(SQLCIPHER_HMAC_SHA1);
} else if(sqlite3StrICmp(zRight, SQLCIPHER_HMAC_SHA256_LABEL) == 0) {
rc = sqlcipher_set_default_hmac_algorithm(SQLCIPHER_HMAC_SHA256);
} else if(sqlite3StrICmp(zRight, SQLCIPHER_HMAC_SHA512_LABEL) == 0) {
rc = sqlcipher_set_default_hmac_algorithm(SQLCIPHER_HMAC_SHA512);
}
} else {
int algorithm = sqlcipher_get_default_hmac_algorithm();
if(algorithm == SQLCIPHER_HMAC_SHA1) {
codec_vdbe_return_string(pParse, "cipher_default_hmac_algorithm", SQLCIPHER_HMAC_SHA1_LABEL, P4_TRANSIENT);
} else if(algorithm == SQLCIPHER_HMAC_SHA256) {
codec_vdbe_return_string(pParse, "cipher_default_hmac_algorithm", SQLCIPHER_HMAC_SHA256_LABEL, P4_TRANSIENT);
} else if(algorithm == SQLCIPHER_HMAC_SHA512) {
codec_vdbe_return_string(pParse, "cipher_default_hmac_algorithm", SQLCIPHER_HMAC_SHA512_LABEL, P4_TRANSIENT);
}
}
}else
if( sqlite3StrICmp(zLeft,"cipher_kdf_algorithm")==0 ){
if(ctx) {
if(zRight) {
rc = SQLITE_ERROR;
if(sqlite3StrICmp(zRight, SQLCIPHER_PBKDF2_HMAC_SHA1_LABEL) == 0) {
rc = sqlcipher_codec_ctx_set_kdf_algorithm(ctx, SQLCIPHER_PBKDF2_HMAC_SHA1);
} else if(sqlite3StrICmp(zRight, SQLCIPHER_PBKDF2_HMAC_SHA256_LABEL) == 0) {
rc = sqlcipher_codec_ctx_set_kdf_algorithm(ctx, SQLCIPHER_PBKDF2_HMAC_SHA256);
} else if(sqlite3StrICmp(zRight, SQLCIPHER_PBKDF2_HMAC_SHA512_LABEL) == 0) {
rc = sqlcipher_codec_ctx_set_kdf_algorithm(ctx, SQLCIPHER_PBKDF2_HMAC_SHA512);
}
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
} else {
int algorithm = sqlcipher_codec_ctx_get_kdf_algorithm(ctx);
if(algorithm == SQLCIPHER_PBKDF2_HMAC_SHA1) {
codec_vdbe_return_string(pParse, "cipher_kdf_algorithm", SQLCIPHER_PBKDF2_HMAC_SHA1_LABEL, P4_TRANSIENT);
} else if(algorithm == SQLCIPHER_PBKDF2_HMAC_SHA256) {
codec_vdbe_return_string(pParse, "cipher_kdf_algorithm", SQLCIPHER_PBKDF2_HMAC_SHA256_LABEL, P4_TRANSIENT);
} else if(algorithm == SQLCIPHER_PBKDF2_HMAC_SHA512) {
codec_vdbe_return_string(pParse, "cipher_kdf_algorithm", SQLCIPHER_PBKDF2_HMAC_SHA512_LABEL, P4_TRANSIENT);
}
}
}
}else
if( sqlite3StrICmp(zLeft,"cipher_default_kdf_algorithm")==0 ){
if(zRight) {
rc = SQLITE_ERROR;
if(sqlite3StrICmp(zRight, SQLCIPHER_PBKDF2_HMAC_SHA1_LABEL) == 0) {
rc = sqlcipher_set_default_kdf_algorithm(SQLCIPHER_PBKDF2_HMAC_SHA1);
} else if(sqlite3StrICmp(zRight, SQLCIPHER_PBKDF2_HMAC_SHA256_LABEL) == 0) {
rc = sqlcipher_set_default_kdf_algorithm(SQLCIPHER_PBKDF2_HMAC_SHA256);
} else if(sqlite3StrICmp(zRight, SQLCIPHER_PBKDF2_HMAC_SHA512_LABEL) == 0) {
rc = sqlcipher_set_default_kdf_algorithm(SQLCIPHER_PBKDF2_HMAC_SHA512);
}
} else {
int algorithm = sqlcipher_get_default_kdf_algorithm();
if(algorithm == SQLCIPHER_PBKDF2_HMAC_SHA1) {
codec_vdbe_return_string(pParse, "cipher_default_kdf_algorithm", SQLCIPHER_PBKDF2_HMAC_SHA1_LABEL, P4_TRANSIENT);
} else if(algorithm == SQLCIPHER_PBKDF2_HMAC_SHA256) {
codec_vdbe_return_string(pParse, "cipher_default_kdf_algorithm", SQLCIPHER_PBKDF2_HMAC_SHA256_LABEL, P4_TRANSIENT);
} else if(algorithm == SQLCIPHER_PBKDF2_HMAC_SHA512) {
codec_vdbe_return_string(pParse, "cipher_default_kdf_algorithm", SQLCIPHER_PBKDF2_HMAC_SHA512_LABEL, P4_TRANSIENT);
}
}
}else
if( sqlite3StrICmp(zLeft,"cipher_compatibility")==0 ){
if(ctx) {
if(zRight) {
int version = atoi(zRight);
switch(version) {
case 1:
rc = sqlcipher_codec_ctx_set_pagesize(ctx, 1024);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_hmac_algorithm(ctx, SQLCIPHER_HMAC_SHA1);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_kdf_algorithm(ctx, SQLCIPHER_PBKDF2_HMAC_SHA1);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_kdf_iter(ctx, 4000);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_use_hmac(ctx, 0);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
break;
case 2:
rc = sqlcipher_codec_ctx_set_pagesize(ctx, 1024);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_hmac_algorithm(ctx, SQLCIPHER_HMAC_SHA1);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_kdf_algorithm(ctx, SQLCIPHER_PBKDF2_HMAC_SHA1);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_kdf_iter(ctx, 4000);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_use_hmac(ctx, 1);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
break;
case 3:
rc = sqlcipher_codec_ctx_set_pagesize(ctx, 1024);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_hmac_algorithm(ctx, SQLCIPHER_HMAC_SHA1);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_kdf_algorithm(ctx, SQLCIPHER_PBKDF2_HMAC_SHA1);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_kdf_iter(ctx, 64000);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_use_hmac(ctx, 1);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
break;
default:
rc = sqlcipher_codec_ctx_set_pagesize(ctx, 4096);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_hmac_algorithm(ctx, SQLCIPHER_HMAC_SHA512);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_kdf_algorithm(ctx, SQLCIPHER_PBKDF2_HMAC_SHA512);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_kdf_iter(ctx, 256000);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
rc = sqlcipher_codec_ctx_set_use_hmac(ctx, 1);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
break;
}
rc = codec_set_btree_to_codec_pagesize(db, pDb, ctx);
if (rc != SQLITE_OK) sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR);
}
}
}else
if( sqlite3StrICmp(zLeft,"cipher_default_compatibility")==0 ){
if(zRight) {
int version = atoi(zRight);
switch(version) {
case 1:
sqlcipher_set_default_pagesize(1024);
sqlcipher_set_default_hmac_algorithm(SQLCIPHER_HMAC_SHA1);
sqlcipher_set_default_kdf_algorithm(SQLCIPHER_PBKDF2_HMAC_SHA1);
sqlcipher_set_default_kdf_iter(4000);
sqlcipher_set_default_use_hmac(0);
break;
case 2:
sqlcipher_set_default_pagesize(1024);
sqlcipher_set_default_hmac_algorithm(SQLCIPHER_HMAC_SHA1);
sqlcipher_set_default_kdf_algorithm(SQLCIPHER_PBKDF2_HMAC_SHA1);
sqlcipher_set_default_kdf_iter(4000);
sqlcipher_set_default_use_hmac(1);
break;
case 3:
sqlcipher_set_default_pagesize(1024);
sqlcipher_set_default_hmac_algorithm(SQLCIPHER_HMAC_SHA1);
sqlcipher_set_default_kdf_algorithm(SQLCIPHER_PBKDF2_HMAC_SHA1);
sqlcipher_set_default_kdf_iter(64000);
sqlcipher_set_default_use_hmac(1);
break;
default:
sqlcipher_set_default_pagesize(4096);
sqlcipher_set_default_hmac_algorithm(SQLCIPHER_HMAC_SHA512);
sqlcipher_set_default_kdf_algorithm(SQLCIPHER_PBKDF2_HMAC_SHA512);
sqlcipher_set_default_kdf_iter(256000);
sqlcipher_set_default_use_hmac(1);
break;
}
}
}else
if( sqlite3StrICmp(zLeft,"cipher_memory_security")==0 ){
if( zRight ) {
sqlcipher_set_mem_security(sqlite3GetBoolean(zRight,1));
} else {
char *on = sqlite3_mprintf("%d", sqlcipher_get_mem_security());
codec_vdbe_return_string(pParse, "cipher_memory_security", on, P4_DYNAMIC);
}
}else
if( sqlite3StrICmp(zLeft,"cipher_settings")==0 ){
if(ctx) {
int algorithm;
char *pragma;
pragma = sqlite3_mprintf("PRAGMA kdf_iter = %d;", sqlcipher_codec_ctx_get_kdf_iter(ctx));
codec_vdbe_return_string(pParse, "pragma", pragma, P4_DYNAMIC);
pragma = sqlite3_mprintf("PRAGMA cipher_page_size = %d;", sqlcipher_codec_ctx_get_pagesize(ctx));
codec_vdbe_return_string(pParse, "pragma", pragma, P4_DYNAMIC);
pragma = sqlite3_mprintf("PRAGMA cipher_use_hmac = %d;", sqlcipher_codec_ctx_get_use_hmac(ctx));
codec_vdbe_return_string(pParse, "pragma", pragma, P4_DYNAMIC);
pragma = sqlite3_mprintf("PRAGMA cipher_plaintext_header_size = %d;", sqlcipher_codec_ctx_get_plaintext_header_size(ctx));
codec_vdbe_return_string(pParse, "pragma", pragma, P4_DYNAMIC);
algorithm = sqlcipher_codec_ctx_get_hmac_algorithm(ctx);
pragma = NULL;
if(algorithm == SQLCIPHER_HMAC_SHA1) {
pragma = sqlite3_mprintf("PRAGMA cipher_hmac_algorithm = %s;", SQLCIPHER_HMAC_SHA1_LABEL);
} else if(algorithm == SQLCIPHER_HMAC_SHA256) {
pragma = sqlite3_mprintf("PRAGMA cipher_hmac_algorithm = %s;", SQLCIPHER_HMAC_SHA256_LABEL);
} else if(algorithm == SQLCIPHER_HMAC_SHA512) {
pragma = sqlite3_mprintf("PRAGMA cipher_hmac_algorithm = %s;", SQLCIPHER_HMAC_SHA512_LABEL);
}
codec_vdbe_return_string(pParse, "pragma", pragma, P4_DYNAMIC);
algorithm = sqlcipher_codec_ctx_get_kdf_algorithm(ctx);
pragma = NULL;
if(algorithm == SQLCIPHER_PBKDF2_HMAC_SHA1) {
pragma = sqlite3_mprintf("PRAGMA cipher_kdf_algorithm = %s;", SQLCIPHER_PBKDF2_HMAC_SHA1_LABEL);
} else if(algorithm == SQLCIPHER_PBKDF2_HMAC_SHA256) {
pragma = sqlite3_mprintf("PRAGMA cipher_kdf_algorithm = %s;", SQLCIPHER_PBKDF2_HMAC_SHA256_LABEL);
} else if(algorithm == SQLCIPHER_PBKDF2_HMAC_SHA512) {
pragma = sqlite3_mprintf("PRAGMA cipher_kdf_algorithm = %s;", SQLCIPHER_PBKDF2_HMAC_SHA512_LABEL);
}
codec_vdbe_return_string(pParse, "pragma", pragma, P4_DYNAMIC);
}
}else
if( sqlite3StrICmp(zLeft,"cipher_default_settings")==0 ){
int algorithm;
char *pragma;
pragma = sqlite3_mprintf("PRAGMA cipher_default_kdf_iter = %d;", sqlcipher_get_default_kdf_iter());
codec_vdbe_return_string(pParse, "pragma", pragma, P4_DYNAMIC);
pragma = sqlite3_mprintf("PRAGMA cipher_default_page_size = %d;", sqlcipher_get_default_pagesize());
codec_vdbe_return_string(pParse, "pragma", pragma, P4_DYNAMIC);
pragma = sqlite3_mprintf("PRAGMA cipher_default_use_hmac = %d;", sqlcipher_get_default_use_hmac());
codec_vdbe_return_string(pParse, "pragma", pragma, P4_DYNAMIC);
pragma = sqlite3_mprintf("PRAGMA cipher_default_plaintext_header_size = %d;", sqlcipher_get_default_plaintext_header_size());
codec_vdbe_return_string(pParse, "pragma", pragma, P4_DYNAMIC);
algorithm = sqlcipher_get_default_hmac_algorithm();
pragma = NULL;
if(algorithm == SQLCIPHER_HMAC_SHA1) {
pragma = sqlite3_mprintf("PRAGMA cipher_default_hmac_algorithm = %s;", SQLCIPHER_HMAC_SHA1_LABEL);
} else if(algorithm == SQLCIPHER_HMAC_SHA256) {
pragma = sqlite3_mprintf("PRAGMA cipher_default_hmac_algorithm = %s;", SQLCIPHER_HMAC_SHA256_LABEL);
} else if(algorithm == SQLCIPHER_HMAC_SHA512) {
pragma = sqlite3_mprintf("PRAGMA cipher_default_hmac_algorithm = %s;", SQLCIPHER_HMAC_SHA512_LABEL);
}
codec_vdbe_return_string(pParse, "pragma", pragma, P4_DYNAMIC);
algorithm = sqlcipher_get_default_kdf_algorithm();
pragma = NULL;
if(algorithm == SQLCIPHER_PBKDF2_HMAC_SHA1) {
pragma = sqlite3_mprintf("PRAGMA cipher_default_kdf_algorithm = %s;", SQLCIPHER_PBKDF2_HMAC_SHA1_LABEL);
} else if(algorithm == SQLCIPHER_PBKDF2_HMAC_SHA256) {
pragma = sqlite3_mprintf("PRAGMA cipher_default_kdf_algorithm = %s;", SQLCIPHER_PBKDF2_HMAC_SHA256_LABEL);
} else if(algorithm == SQLCIPHER_PBKDF2_HMAC_SHA512) {
pragma = sqlite3_mprintf("PRAGMA cipher_default_kdf_algorithm = %s;", SQLCIPHER_PBKDF2_HMAC_SHA512_LABEL);
}
codec_vdbe_return_string(pParse, "pragma", pragma, P4_DYNAMIC);
}else {
return 0;
}
return 1;
}
/* these constants are used internally within SQLite's pager.c to differentiate between
operations on the main database or journal pages. This is important in the context
of a rekey operations, where the journal must be written using the original key
material (to allow a transactional rollback), while the new database pages are being
written with the new key material*/
#define CODEC_READ_OP 3
#define CODEC_WRITE_OP 6
#define CODEC_JOURNAL_OP 7
/*
* sqlite3Codec can be called in multiple modes.
* encrypt mode - expected to return a pointer to the
* encrypted data without altering pData.
* decrypt mode - expected to return a pointer to pData, with
* the data decrypted in the input buffer
*/
static void* sqlite3Codec(void *iCtx, void *data, Pgno pgno, int mode) {
codec_ctx *ctx = (codec_ctx *) iCtx;
int offset = 0, rc = 0;
int page_sz = sqlcipher_codec_ctx_get_pagesize(ctx);
unsigned char *pData = (unsigned char *) data;
void *buffer = sqlcipher_codec_ctx_get_data(ctx);
int plaintext_header_sz = sqlcipher_codec_ctx_get_plaintext_header_size(ctx);
int cctx = CIPHER_READ_CTX;
CODEC_TRACE("sqlite3Codec: entered pgno=%d, mode=%d, page_sz=%d\n", pgno, mode, page_sz);
#ifdef SQLCIPHER_LICENSE
if(sqlcipher_license_check(ctx) != SQLITE_OK) return NULL;
#endif
/* call to derive keys if not present yet */
if((rc = sqlcipher_codec_key_derive(ctx)) != SQLITE_OK) {
sqlcipher_codec_ctx_set_error(ctx, rc);
return NULL;
}
if(pgno == 1) /* adjust starting pointers in data page for header offset on first page*/
offset = plaintext_header_sz ? plaintext_header_sz : FILE_HEADER_SZ;
CODEC_TRACE("sqlite3Codec: switch mode=%d offset=%d\n", mode, offset);
switch(mode) {
case CODEC_READ_OP: /* decrypt */
if(pgno == 1) /* copy initial part of file header or SQLite magic to buffer */
memcpy(buffer, plaintext_header_sz ? pData : (void *) SQLITE_FILE_HEADER, offset);
rc = sqlcipher_page_cipher(ctx, cctx, pgno, CIPHER_DECRYPT, page_sz - offset, pData + offset, (unsigned char*)buffer + offset);
if(rc != SQLITE_OK) { /* clear results of failed cipher operation and set error */
sqlcipher_memset((unsigned char*) buffer+offset, 0, page_sz-offset);
sqlcipher_codec_ctx_set_error(ctx, rc);
}
memcpy(pData, buffer, page_sz); /* copy buffer data back to pData and return */
return pData;
break;
case CODEC_WRITE_OP: /* encrypt database page, operate on write context and fall through to case 7, so the write context is used*/
cctx = CIPHER_WRITE_CTX;
case CODEC_JOURNAL_OP: /* encrypt journal page, operate on read context use to get the original page data from the database */
if(pgno == 1) { /* copy initial part of file header or salt to buffer */
void *kdf_salt = NULL;
/* retrieve the kdf salt */
if((rc = sqlcipher_codec_ctx_get_kdf_salt(ctx, &kdf_salt)) != SQLITE_OK) {
sqlcipher_codec_ctx_set_error(ctx, rc);
return NULL;
}
memcpy(buffer, plaintext_header_sz ? pData : kdf_salt, offset);
}
rc = sqlcipher_page_cipher(ctx, cctx, pgno, CIPHER_ENCRYPT, page_sz - offset, pData + offset, (unsigned char*)buffer + offset);
if(rc != SQLITE_OK) { /* clear results of failed cipher operation and set error */
sqlcipher_memset((unsigned char*)buffer+offset, 0, page_sz-offset);
sqlcipher_codec_ctx_set_error(ctx, rc);
}
return buffer; /* return persistent buffer data, pData remains intact */
break;
default:
sqlcipher_codec_ctx_set_error(ctx, SQLITE_ERROR); /* unsupported mode, set error */
return pData;
break;
}
}
static void sqlite3FreeCodecArg(void *pCodecArg) {
codec_ctx *ctx = (codec_ctx *) pCodecArg;
if(pCodecArg == NULL) return;
sqlcipher_codec_ctx_free(&ctx); /* wipe and free allocated memory for the context */
sqlcipher_deactivate(); /* cleanup related structures, OpenSSL etc, when codec is detatched */
}
int sqlite3CodecAttach(sqlite3* db, int nDb, const void *zKey, int nKey) {
struct Db *pDb = &db->aDb[nDb];
CODEC_TRACE("sqlite3CodecAttach: entered db=%p, nDb=%d zKey=%s, nKey=%d\n", db, nDb, (char *)zKey, nKey);
if(nKey && zKey && pDb->pBt) {
int rc;
Pager *pPager = pDb->pBt->pBt->pPager;
sqlite3_file *fd;
codec_ctx *ctx;
/* check if the sqlite3_file is open, and if not force handle to NULL */
if((fd = sqlite3PagerFile(pPager))->pMethods == 0) fd = NULL;
CODEC_TRACE("sqlite3CodecAttach: calling sqlcipher_activate()\n");
sqlcipher_activate(); /* perform internal initialization for sqlcipher */
CODEC_TRACE_MUTEX("sqlite3CodecAttach: entering database mutex %p\n", db->mutex);
sqlite3_mutex_enter(db->mutex);
CODEC_TRACE_MUTEX("sqlite3CodecAttach: entered database mutex %p\n", db->mutex);
#ifdef SQLCIPHER_LICENSE
if((rc = sqlite3_set_authorizer(db, sqlcipher_license_authorizer, db)) != SQLITE_OK) {
sqlite3_mutex_leave(db->mutex);
return rc;
}
#endif
/* point the internal codec argument against the contet to be prepared */
CODEC_TRACE("sqlite3CodecAttach: calling sqlcipher_codec_ctx_init()\n");
rc = sqlcipher_codec_ctx_init(&ctx, pDb, pDb->pBt->pBt->pPager, zKey, nKey);
if(rc != SQLITE_OK) {
/* initialization failed, do not attach potentially corrupted context */
CODEC_TRACE("sqlite3CodecAttach: context initialization failed with rc=%d\n", rc);
CODEC_TRACE_MUTEX("sqlite3CodecAttach: leaving database mutex %p (early return on rc=%d)\n", db->mutex, rc);
sqlite3_mutex_leave(db->mutex);
CODEC_TRACE_MUTEX("sqlite3CodecAttach: left database mutex %p (early return on rc=%d)\n", db->mutex, rc);
return rc;
}
CODEC_TRACE("sqlite3CodecAttach: calling sqlite3PagerSetCodec()\n");
sqlite3PagerSetCodec(sqlite3BtreePager(pDb->pBt), sqlite3Codec, NULL, sqlite3FreeCodecArg, (void *) ctx);
CODEC_TRACE("sqlite3CodecAttach: calling codec_set_btree_to_codec_pagesize()\n");
codec_set_btree_to_codec_pagesize(db, pDb, ctx);
/* force secure delete. This has the benefit of wiping internal data when deleted
and also ensures that all pages are written to disk (i.e. not skipped by
sqlite3PagerDontWrite optimizations) */
CODEC_TRACE("sqlite3CodecAttach: calling sqlite3BtreeSecureDelete()\n");
sqlite3BtreeSecureDelete(pDb->pBt, 1);
/* if fd is null, then this is an in-memory database and
we dont' want to overwrite the AutoVacuum settings
if not null, then set to the default */
if(fd != NULL) {
CODEC_TRACE("sqlite3CodecAttach: calling sqlite3BtreeSetAutoVacuum()\n");
sqlite3BtreeSetAutoVacuum(pDb->pBt, SQLITE_DEFAULT_AUTOVACUUM);
}
CODEC_TRACE_MUTEX("sqlite3CodecAttach: leaving database mutex %p\n", db->mutex);
sqlite3_mutex_leave(db->mutex);
CODEC_TRACE_MUTEX("sqlite3CodecAttach: left database mutex %p\n", db->mutex);
}
return SQLITE_OK;
}
int sqlcipher_find_db_index(sqlite3 *db, const char *zDb) {
int db_index;
if(zDb == NULL){
return 0;
}
for(db_index = 0; db_index < db->nDb; db_index++) {
struct Db *pDb = &db->aDb[db_index];
if(strcmp(pDb->zDbSName, zDb) == 0) {
return db_index;
}
}
return 0;
}
void sqlite3_activate_see(const char* in) {
/* do nothing, security enhancements are always active */
}
int sqlite3_key(sqlite3 *db, const void *pKey, int nKey) {
CODEC_TRACE("sqlite3_key entered: db=%p pKey=%s nKey=%d\n", db, (char *)pKey, nKey);
return sqlite3_key_v2(db, "main", pKey, nKey);
}
int sqlite3_key_v2(sqlite3 *db, const char *zDb, const void *pKey, int nKey) {
CODEC_TRACE("sqlite3_key_v2: entered db=%p zDb=%s pKey=%s nKey=%d\n", db, zDb, (char *)pKey, nKey);
/* attach key if db and pKey are not null and nKey is > 0 */
if(db && pKey && nKey) {
int db_index = sqlcipher_find_db_index(db, zDb);
return sqlite3CodecAttach(db, db_index, pKey, nKey);
}
return SQLITE_ERROR;
}
int sqlite3_rekey(sqlite3 *db, const void *pKey, int nKey) {
CODEC_TRACE("sqlite3_rekey entered: db=%p pKey=%s nKey=%d\n", db, (char *)pKey, nKey);
return sqlite3_rekey_v2(db, "main", pKey, nKey);
}
/* sqlite3_rekey_v2
** Given a database, this will reencrypt the database using a new key.
** There is only one possible modes of operation - to encrypt a database
** that is already encrpyted. If the database is not already encrypted
** this should do nothing
** The proposed logic for this function follows:
** 1. Determine if the database is already encryptped
** 2. If there is NOT already a key present do nothing
** 3. If there is a key present, re-encrypt the database with the new key
*/
int sqlite3_rekey_v2(sqlite3 *db, const char *zDb, const void *pKey, int nKey) {
CODEC_TRACE("sqlite3_rekey_v2: entered db=%p zDb=%s pKey=%s, nKey=%d\n", db, zDb, (char *)pKey, nKey);
if(db && pKey && nKey) {
int db_index = sqlcipher_find_db_index(db, zDb);
struct Db *pDb = &db->aDb[db_index];
CODEC_TRACE("sqlite3_rekey_v2: database pDb=%p db_index:%d\n", pDb, db_index);
if(pDb->pBt) {
codec_ctx *ctx;
int rc, page_count;
Pgno pgno;
PgHdr *page;
Pager *pPager = pDb->pBt->pBt->pPager;
ctx = (codec_ctx*) sqlite3PagerGetCodec(pDb->pBt->pBt->pPager);
if(ctx == NULL) {
/* there was no codec attached to this database, so this should do nothing! */
CODEC_TRACE("sqlite3_rekey_v2: no codec attached to db, exiting\n");
return SQLITE_OK;
}
CODEC_TRACE_MUTEX("sqlite3_rekey_v2: entering database mutex %p\n", db->mutex);
sqlite3_mutex_enter(db->mutex);
CODEC_TRACE_MUTEX("sqlite3_rekey_v2: entered database mutex %p\n", db->mutex);
codec_set_pass_key(db, db_index, pKey, nKey, CIPHER_WRITE_CTX);
/* do stuff here to rewrite the database
** 1. Create a transaction on the database
** 2. Iterate through each page, reading it and then writing it.
** 3. If that goes ok then commit and put ctx->rekey into ctx->key
** note: don't deallocate rekey since it may be used in a subsequent iteration
*/
rc = sqlite3BtreeBeginTrans(pDb->pBt, 1, 0); /* begin write transaction */
sqlite3PagerPagecount(pPager, &page_count);
for(pgno = 1; rc == SQLITE_OK && pgno <= (unsigned int)page_count; pgno++) { /* pgno's start at 1 see pager.c:pagerAcquire */
if(!sqlite3pager_is_mj_pgno(pPager, pgno)) { /* skip this page (see pager.c:pagerAcquire for reasoning) */
rc = sqlite3PagerGet(pPager, pgno, &page, 0);
if(rc == SQLITE_OK) { /* write page see pager_incr_changecounter for example */
rc = sqlite3PagerWrite(page);
if(rc == SQLITE_OK) {
sqlite3PagerUnref(page);
} else {
CODEC_TRACE("sqlite3_rekey_v2: error %d occurred writing page %d\n", rc, pgno);
}
} else {
CODEC_TRACE("sqlite3_rekey_v2: error %d occurred getting page %d\n", rc, pgno);
}
}
}
/* if commit was successful commit and copy the rekey data to current key, else rollback to release locks */
if(rc == SQLITE_OK) {
CODEC_TRACE("sqlite3_rekey_v2: committing\n");
rc = sqlite3BtreeCommit(pDb->pBt);
sqlcipher_codec_key_copy(ctx, CIPHER_WRITE_CTX);
} else {
CODEC_TRACE("sqlite3_rekey_v2: rollback\n");
sqlite3BtreeRollback(pDb->pBt, SQLITE_ABORT_ROLLBACK, 0);
}
CODEC_TRACE_MUTEX("sqlite3_rekey_v2: leaving database mutex %p\n", db->mutex);
sqlite3_mutex_leave(db->mutex);
CODEC_TRACE_MUTEX("sqlite3_rekey_v2: left database mutex %p\n", db->mutex);
}
return SQLITE_OK;
}
return SQLITE_ERROR;
}
void sqlite3CodecGetKey(sqlite3* db, int nDb, void **zKey, int *nKey) {
struct Db *pDb = &db->aDb[nDb];
CODEC_TRACE("sqlite3CodecGetKey: entered db=%p, nDb=%d\n", db, nDb);
if( pDb->pBt ) {
codec_ctx *ctx = (codec_ctx*) sqlite3PagerGetCodec(pDb->pBt->pBt->pPager);
if(ctx) {
/* pass back the keyspec from the codec, unless PRAGMA cipher_store_pass
is set or keyspec has not yet been derived, in which case pass
back the password key material */
sqlcipher_codec_get_keyspec(ctx, zKey, nKey);
if(sqlcipher_codec_get_store_pass(ctx) == 1 || *zKey == NULL) {
sqlcipher_codec_get_pass(ctx, zKey, nKey);
}
} else {
*zKey = NULL;
*nKey = 0;
}
}
}
#ifndef OMIT_EXPORT
/*
* Implementation of an "export" function that allows a caller
* to duplicate the main database to an attached database. This is intended
* as a conveneince for users who need to:
*
* 1. migrate from an non-encrypted database to an encrypted database
* 2. move from an encrypted database to a non-encrypted database
* 3. convert beween the various flavors of encrypted databases.
*
* This implementation is based heavily on the procedure and code used
* in vacuum.c, but is exposed as a function that allows export to any
* named attached database.
*/
/*
** Finalize a prepared statement. If there was an error, store the
** text of the error message in *pzErrMsg. Return the result code.
**
** Based on vacuumFinalize from vacuum.c
*/
static int sqlcipher_finalize(sqlite3 *db, sqlite3_stmt *pStmt, char **pzErrMsg){
int rc;
rc = sqlite3VdbeFinalize((Vdbe*)pStmt);
if( rc ){
sqlite3SetString(pzErrMsg, db, sqlite3_errmsg(db));
}
return rc;
}
/*
** Execute zSql on database db. Return an error code.
**
** Based on execSql from vacuum.c
*/
static int sqlcipher_execSql(sqlite3 *db, char **pzErrMsg, const char *zSql){
sqlite3_stmt *pStmt;
VVA_ONLY( int rc; )
if( !zSql ){
return SQLITE_NOMEM;
}
if( SQLITE_OK!=sqlite3_prepare(db, zSql, -1, &pStmt, 0) ){
sqlite3SetString(pzErrMsg, db, sqlite3_errmsg(db));
return sqlite3_errcode(db);
}
VVA_ONLY( rc = ) sqlite3_step(pStmt);
assert( rc!=SQLITE_ROW );
return sqlcipher_finalize(db, pStmt, pzErrMsg);
}
/*
** Execute zSql on database db. The statement returns exactly
** one column. Execute this as SQL on the same database.
**
** Based on execExecSql from vacuum.c
*/
static int sqlcipher_execExecSql(sqlite3 *db, char **pzErrMsg, const char *zSql){
sqlite3_stmt *pStmt;
int rc;
rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
if( rc!=SQLITE_OK ) return rc;
while( SQLITE_ROW==sqlite3_step(pStmt) ){