pub fn crypto_secretbox_open(ciphertext: &[u8], nonce: &[u8], key: &[u8]) -> Result<Vec<u8>, DecryptionError> {
    assert!(ciphertext.len() >= crypto_secretbox_OVERHEADBYTES);
    let (mut auth, mut stream) = crypto_secretbox_setup(nonce, key);
    let taglen = crypto_secretbox_OVERHEADBYTES;

    // Allocate the backing storage for the plaintext.
    let outlen = ciphertext.len() - taglen;
    let mut out: Vec<u8> = repeat(0).take(outlen).collect();

    // Authenticate the ciphertext.
    let mut tag = [0u8; 16];
    auth.input(&ciphertext[taglen..]);
    auth.raw_result(&mut tag);
    if fixed_time_eq(&tag, &ciphertext[..taglen]) {
        // Decrypt the ciphertext.
        stream.process(&ciphertext[taglen..], out.as_mut_slice());
        return Ok(out);
    } else {
        return Err(DecryptionError);
    }
}
/// Secret-key authenticated decryption.
///
/// The crypto_secretbox_open function authenticates and decrypts a
/// ciphertext, using a secret key and nonce, returning the corresponding
/// plaintext.  This function asserts if key.len() is not crypto_secretbox_KEYBYTES,
/// if nonce.len() is not crypto_secrebox_NONCEBYTES or if, ciphertext.len()
/// is < crypto_secretbox_OVERHEADBYTES.
///
/// # Arguments
/// * ciphertext - The ciphertext to authenticate/decrypt.
/// * nonce - The nonce to use for the authentication/decryption.
/// * key - The key to use for the authentication/decryption.
Secret-key authenticated decryption.
The crypto_secretbox_open function authenticates and decrypts a
ciphertext, using a secret key and nonce, returning the corresponding
plaintext.  This function asserts if key.len() is not crypto_secretbox_KEYBYTES,
if nonce.len() is not crypto_secrebox_NONCEBYTES or if, ciphertext.len()
is < crypto_secretbox_OVERHEADBYTES.
Secret - key authenticated decryption . The crypto_secretbox_open function authenticates and decrypts a ciphertext using a secret key and nonce returning the corresponding plaintext . This function asserts if key . len () is not crypto_secretbox_KEYBYTES if nonce . len () is not crypto_secrebox_NONCEBYTES or if ciphertext . len () is < crypto_secretbox_OVERHEADBYTES .
pub fn crypto_secretbox_open(ciphertext: &[u8], nonce: &[u8], key: &[u8]) -> Result<Vec<u8>, DecryptionError> {
    assert!(ciphertext.len() >= crypto_secretbox_OVERHEADBYTES);
    let (mut auth, mut stream) = crypto_secretbox_setup(nonce, key);
    let taglen = crypto_secretbox_OVERHEADBYTES;
    // Allocate the backing storage for the plaintext.
    let outlen = ciphertext.len() - taglen;
    let mut out: Vec<u8> = repeat(0).take(outlen).collect();
    // Authenticate the ciphertext.
    let mut tag = [0u8; 16];
    auth.input(&ciphertext[taglen..]);
    auth.raw_result(&mut tag);
    if fixed_time_eq(&tag, &ciphertext[..taglen]) {
        // Decrypt the ciphertext.
        stream.process(&ciphertext[taglen..], out.as_mut_slice());
        return Ok(out);
    } else {
        return Err(DecryptionError);
    }
}
pub fn crypto_secretbox_open ( ciphertext : & [ u8 ] , nonce : & [ u8 ] , key : & [ u8 ] ) -> Result < Vec < u8 > , DecryptionError > { assert ! ( ciphertext len ( ) crypto_secretbox_OVERHEADBYTES ) ; let ( mut auth , mut stream ) = crypto_secretbox_setup ( nonce , key ) ; let taglen = crypto_secretbox_OVERHEADBYTES ; // Allocate the backing storage for the plaintext. let outlen = ciphertext . len ( ) - taglen ; let mut out : Vec < u8 > = repeat ( 0 ) . take ( outlen ) . collect ( ) ; // Authenticate the ciphertext. let mut tag = [ 0u8 ; 16 ] ; auth . input ( & ciphertext [ taglen .. ] ) ; auth . raw_result ( & mut tag ) ; if fixed_time_eq ( & tag , & ciphertext [ .. taglen ] ) { // Decrypt the ciphertext. stream . process ( & ciphertext [ taglen .. ] , out . as_mut_slice ( ) ) ; return Ok ( out ) ; } else { return Err ( DecryptionError ) ; } }
Secret-key authenticated decryption.
Secret - key authenticated decryption .
ciphertext
&[u8]
nonce
&[u8]
key
&[u8]
ciphertext
&[u8]
nonce
&[u8]
key
&[u8]