I need a portable decrypter that would be compatible with Linux dm-crypt aes-xts-plain64. While there is a plenty of aes implementations that would be compatible with aes-ecb, it looks I didn’t find any C library that would provide something similar to aes_xts_plain64(uint8_t *buff, const uint8_t key[32], unsigned block_number).

I tried several AI prompts but it was delusional providing my an ad-hoc incorrect tweak algorithm.

I don’t need anything very fast, because I need just to decrypt few megabytes, I don’t need anything ported to a specific CPU, but I need to run it on very memory limited hardware.

I know there is an implementation is grub but it looks that it’s as hard to extract from sources (grub/grub-core/disk/cryptodisk.c) as extracting from the kernel.

Perhaps there is a ready to use implementation? Just plain searching didn’t reveal anything, but again searching didn’t find grub sources, so perhaps there is a ready to use solution somewhere.

It is ok to have a library in non-C language, because I feel it’s would be still easier to convert that to extract from linux or grub.