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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use crate::err::IntoResult;
use crate::init;
use crate::p11;
use crate::p11::PK11_HashBuf;
use crate::p11::SECOidTag;
use crate::Error;
use std::convert::TryFrom;
//
// Constants
//
pub enum HashAlgorithm {
SHA2_256,
SHA2_384,
SHA2_512,
}
fn hash_alg_to_oid(alg: &HashAlgorithm) -> Result<SECOidTag::Type, Error> {
match alg {
HashAlgorithm::SHA2_256 => Ok(SECOidTag::SEC_OID_SHA256),
HashAlgorithm::SHA2_384 => Ok(SECOidTag::SEC_OID_SHA384),
HashAlgorithm::SHA2_512 => Ok(SECOidTag::SEC_OID_SHA512),
}
}
pub fn hash_alg_to_hash_len(alg: &HashAlgorithm) -> Result<usize, Error> {
match alg {
HashAlgorithm::SHA2_256 => Ok(p11::SHA256_LENGTH as usize),
HashAlgorithm::SHA2_384 => Ok(p11::SHA384_LENGTH as usize),
HashAlgorithm::SHA2_512 => Ok(p11::SHA512_LENGTH as usize),
}
}
//
// Hash function
//
pub fn hash(alg: HashAlgorithm, data: &[u8]) -> Result<Vec<u8>, crate::Error> {
init();
let data_len: i32 = match i32::try_from(data.len()) {
Ok(data_len) => data_len,
_ => return Err(Error::InternalError),
};
let expected_len = hash_alg_to_hash_len(&alg)?;
let mut digest = vec![0u8; expected_len];
unsafe {
PK11_HashBuf(
hash_alg_to_oid(&alg)?,
digest.as_mut_ptr(),
data.as_ptr(),
data_len,
)
.into_result()?
};
Ok(digest)
}