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use chrono::{DateTime, Utc};
use hmac::{Hmac, Mac};
use sha2::Sha256;
use garage_util::data::{sha256sum, Hash};
pub mod error;
pub mod payload;
pub mod streaming;
use error::*;
pub const SHORT_DATE: &str = "%Y%m%d";
pub const LONG_DATETIME: &str = "%Y%m%dT%H%M%SZ";
type HmacSha256 = Hmac<Sha256>;
pub fn verify_signed_content(expected_sha256: Hash, body: &[u8]) -> Result<(), Error> {
if expected_sha256 != sha256sum(body) {
return Err(Error::bad_request(
"Request content hash does not match signed hash".to_string(),
));
}
Ok(())
}
pub fn signing_hmac(
datetime: &DateTime<Utc>,
secret_key: &str,
region: &str,
service: &str,
) -> Result<HmacSha256, crypto_common::InvalidLength> {
let secret = String::from("AWS4") + secret_key;
let mut date_hmac = HmacSha256::new_from_slice(secret.as_bytes())?;
date_hmac.update(datetime.format(SHORT_DATE).to_string().as_bytes());
let mut region_hmac = HmacSha256::new_from_slice(&date_hmac.finalize().into_bytes())?;
region_hmac.update(region.as_bytes());
let mut service_hmac = HmacSha256::new_from_slice(®ion_hmac.finalize().into_bytes())?;
service_hmac.update(service.as_bytes());
let mut signing_hmac = HmacSha256::new_from_slice(&service_hmac.finalize().into_bytes())?;
signing_hmac.update(b"aws4_request");
let hmac = HmacSha256::new_from_slice(&signing_hmac.finalize().into_bytes())?;
Ok(hmac)
}
pub fn compute_scope(datetime: &DateTime<Utc>, region: &str, service: &str) -> String {
format!(
"{}/{}/{}/aws4_request",
datetime.format(SHORT_DATE),
region,
service
)
}
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