SQLCrypto is a port of pysqlsimplecipher for Rust, which is a utility to decrypt and encrypt SQLite databases. SQLCipher is still a tad faster, but if you want a pure Rust implementation; here ya go.
This library outperforms pysqlsimplecipher by in order of magnitudes, the Dokkan Battle database took up to 300+ seconds on my machine, down to <700 ms in decryption and less than <100 ms in encryption, and consumes significantly less memory. Other than that, I don't have benchmarks in place.
Please note that this is not production ready, and in its current state; this library has some compromises with regard to security.