Encrypt plaintext using XChaCha20-Poly1305.
Returns a single base64 blob: nonce (24B) || ciphertext || tag (16B).
nonce (24B) || ciphertext || tag (16B)
Encrypt plaintext using XChaCha20-Poly1305.
Returns a single base64 blob:
nonce (24B) || ciphertext || tag (16B).