Function sign_access_token_multiple 

pub fn sign_access_token_multiple<T, RNG>(
    keys: Vec<&CoseKey>,
    claims: ClaimsSet,
    external_aad: Option<&[u8]>,
    unprotected_header: Option<Header>,
    protected_header: Option<Header>,
    rng: RNG,
) -> Result<ByteString, AccessTokenError<T::Error>>
where
    T: MultipleSignCipher,
    RNG: RngCore + CryptoRng,

Signs the given claims with the given headers and external_aad for each recipient by using the keys with the cipher given by type parameter T, returning the token as a serialized bytestring of the CoseSign structure.

For each key in keys, another signature will be added, created with that respective key. The given headers will be used for the CoseSign structure as a whole, not for each individual signature.

Errors

• When there’s a CoseError while serializing the given claims to CBOR.
• When there’s a CoseError while serializing the CoseSign structure.
• When the given headers conflict with the headers set by the cipher T.

Example

For example, assuming we have a MultipleSignCipher in FakeCrypto, a random number generator in rng, and some claims, we can then create a token with signatures for two recipients (with keys key1 and key2, respectively) as follows:

let signed = sign_access_token_multiple::<FakeCrypto, FakeRng>(
    vec![&key1, &key2],
    claims,
    None, None, None,
    rng
)?;