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zeekayandHanzo Dev 8a45f8af04 Convert a database without the C library 
The copy was SQLCipher's sqlcipher_export, a SQL function only the C libsqlcipher
defines. So a build without that library could not convert a plaintext database at
all: the store it was pointed at stayed unopenable, and every test covering the
conversion skipped rather than ran.

Nothing else here needed the C engine. github.com/hanzoai/sqlite encrypts on every
build — the pure-Go SQLCipher codec envelope, byte-compatible with the C one — so
the conversion was the last place the dependency survived, and it did not have to.

It is now a logical copy in Go over two ordinary handles: the plaintext source
opened with no key, a fresh encrypted target opened with one. Tables, then rows,
then indexes and triggers and views, so an index is not rebuilt per insert and a
trigger cannot fire on rows the source never had. Columns are named from
table_xinfo rather than SELECT * — a generated column cannot be inserted into, and
naming them also stops a normalised column order from writing values into the
wrong column. The AUTOINCREMENT counters come across from sqlite_sequence, which
takes a delete and an insert because that table carries no unique index for an
ON CONFLICT target to name.

A byte-level encrypt is not available for this: SQLCipher reserves 80 bytes per
page for its IV and tag, a plaintext database reserves none, and no pragma
retrofits that into an existing file.

A virtual table is REFUSED, naming itself. Its shadow tables hold an index layout
rather than rows, so recreating it regenerates bytes no logical copy can promise
and verify would report a difference the data does not explain. The C function did
that from inside the engine.

The suite now runs on the pure-Go build with nothing skipped — 30 tests, including
fidelity over AUTOINCREMENT, WITHOUT ROWID, a GENERATED column and foreign keys —
and passes identically against a real libsqlcipher. A store converted by either
engine reads back under the other, rows, header fields and counters intact.

Co-authored-by: Hanzo Dev <[email protected]>
2026-08-12 20:08:39 -07:00

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