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Ignore hmac read during Btree file copy

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This commit is contained in:
Nick Parker
2013-09-23 11:16:12 -05:00
parent 314f5735d9
commit fc2fcff453
3 changed files with 10 additions and 8 deletions
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src/crypto_impl.c
+7 -5
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@@ -82,6 +82,7 @@ struct codec_ctx {
Btree *pBt;
cipher_ctx *read_ctx;
cipher_ctx *write_ctx;
unsigned int skip_read_hmac;
};
int sqlcipher_register_provider(sqlcipher_provider *p) {
@@ -756,7 +757,7 @@ int sqlcipher_page_cipher(codec_ctx *ctx, int for_ctx, Pgno pgno, int mode, int
memcpy(iv_out, iv_in, c_ctx->iv_sz); /* copy the iv from the input to output buffer */
}
if((c_ctx->flags & CIPHER_FLAG_HMAC) && (mode == CIPHER_DECRYPT)) {
if((c_ctx->flags & CIPHER_FLAG_HMAC) && (mode == CIPHER_DECRYPT) && !ctx->skip_read_hmac) {
if(sqlcipher_page_hmac(c_ctx, pgno, in, size + c_ctx->iv_sz, hmac_out) != SQLITE_OK) {
sqlcipher_memset(out, 0, page_sz);
CODEC_TRACE(("codec_cipher: hmac operations failed for pgno=%d\n", pgno));
@@ -1048,7 +1049,7 @@ int sqlcipher_codec_ctx_migrate(codec_ctx *ctx) {
CODEC_TRACE(("cannot migrate - SQL statements in progress"));
goto handle_error;
}
/* Save the current value of the database flags so that it can be
** restored before returning. Then set the writable-schema flag, and
** disable CHECK and foreign key constraints. */
@@ -1063,7 +1064,7 @@ int sqlcipher_codec_ctx_migrate(codec_ctx *ctx) {
pDest = db->aDb[0].pBt;
pDb = &(db->aDb[db->nDb-1]);
pSrc = pDb->pBt;
rc = sqlite3_exec(db, "BEGIN;", NULL, NULL, NULL);
rc = sqlite3BtreeBeginTrans(pSrc, 2);
rc = sqlite3BtreeBeginTrans(pDest, 2);
@@ -1071,17 +1072,18 @@ int sqlcipher_codec_ctx_migrate(codec_ctx *ctx) {
assert( 1==sqlite3BtreeIsInTrans(pDest) );
assert( 1==sqlite3BtreeIsInTrans(pSrc) );
sqlite3CodecGetKey(db, db->nDb - 1, (void**)&key, &password_sz);
sqlite3CodecAttach(db, 0, key, password_sz);
sqlite3pager_get_codec(pDest->pBt->pPager, (void**)&ctx);
ctx->skip_read_hmac = 1;
for(i=0; i<ArraySize(aCopy); i+=2){
sqlite3BtreeGetMeta(pSrc, aCopy[i], &meta);
rc = sqlite3BtreeUpdateMeta(pDest, aCopy[i], meta+aCopy[i+1]);
if( NEVER(rc!=SQLITE_OK) ) goto handle_error;
}
rc = sqlite3BtreeCopyFile(pDest, pSrc);
ctx->skip_read_hmac = 0;
if( rc!=SQLITE_OK ) goto handle_error;
rc = sqlite3BtreeCommit(pDest);