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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 std::convert::TryFrom as _;
use crate::{
Error,
err::IntoResult as _,
init, p11,
p11::{PK11_HashBuf, SECOidTag},
};
//
// Constants
//
pub enum HashAlgorithm {
SHA2_256,
SHA2_384,
SHA2_512,
}
const fn hash_alg_to_oid(alg: &HashAlgorithm) -> SECOidTag::Type {
match alg {
HashAlgorithm::SHA2_256 => SECOidTag::SEC_OID_SHA256,
HashAlgorithm::SHA2_384 => SECOidTag::SEC_OID_SHA384,
HashAlgorithm::SHA2_512 => SECOidTag::SEC_OID_SHA512,
}
}
#[must_use]
pub const fn hash_alg_to_hash_len(alg: &HashAlgorithm) -> usize {
match alg {
HashAlgorithm::SHA2_256 => p11::SHA256_LENGTH as usize,
HashAlgorithm::SHA2_384 => p11::SHA384_LENGTH as usize,
HashAlgorithm::SHA2_512 => p11::SHA512_LENGTH as usize,
}
}
//
// Hash function
//
pub fn hash(alg: &HashAlgorithm, data: &[u8]) -> Result<Vec<u8>, Error> {
init()?;
let data_len: i32 = match i32::try_from(data.len()) {
Ok(data_len) => data_len,
_ => return Err(Error::Internal),
};
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)
}