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working implementation of rekey functionality. PRAGMA rekey='passphrase' will now encrypt a database if it is currently unencrypted or re-encrypt with a new passphrase if it is already encrypted.

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This commit is contained in:
Stephen Lombardo 2008-08-06 10:30:36 -04:00
parent 9546e71745
commit ebeaf637db
1 changed files with 27 additions and 1 deletions
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26
src/crypto.c
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@ -28,6 +28,7 @@
#include "crypto.h"
extern int sqlite3pager_get_codec(Pager *pPager, void * ctx);
extern int sqlite3pager_is_mj_pgno(Pager *pPager, Pgno pgno);
typedef struct {
int key_sz;
@ -317,6 +318,11 @@ int sqlite3_rekey(sqlite3 *db, const void *pKey, int nKey) {
struct Db *pDb = &db->aDb[i];
if(pDb->pBt) {
codec_ctx *ctx;
int rc;
Pgno page_count, pgno;
void *page;
Pager *pPager = pDb->pBt->pBt->pPager;
sqlite3pager_get_codec(pDb->pBt->pBt->pPager, (void **) &ctx);
if(ctx == NULL) {
/* there was no codec attached to this database,so attach one now with a null password */
@ -332,7 +338,27 @@ int sqlite3_rekey(sqlite3 *db, const void *pKey, int nKey) {
** 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); /* begin write transaction */
rc = sqlite3PagerPagecount(pPager, &page_count);
for(pgno = 1; rc == SQLITE_OK && pgno <= page_count; pgno++) { /* pgno's start at 1 see pager.c:pagerAcquire */
rc = sqlite3PagerGet(pPager, pgno, &page);
if(rc == SQLITE_OK) { /* write page see pager_incr_changecounter for example */
rc = sqlite3PagerWrite(page);
if(rc == SQLITE_OK) {
sqlite3PagerUnref(page);
}
}
}
/* if commit was successful commit and copy the rekey data to current key, else rollback to release locks */
if(rc == SQLITE_OK) {
rc = sqlite3BtreeCommit(pDb->pBt);
memcpy(ctx->key, ctx->rekey, key_sz);
} else {
sqlite3BtreeRollback(pDb->pBt);
}
/* cleanup rekey data, make sure to overwrite rekey_plaintext or read errors will ensue */
ctx->rekey = NULL;
ctx->rekey_plaintext = 0;
}