Function decrypt 

pub fn decrypt(data: &[u8], passphrase: &str) -> Result<Vec<u8>>

Decrypt age-encrypted data with passphrase.

data must have been produced by encrypt (passphrase mode only — public-key recipients are rejected).

Errors

Returns an error if:

• the age header cannot be parsed,
• the file was encrypted with a public-key recipient instead of a passphrase,
• the passphrase is wrong, or
• the underlying I/O fails.