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use crate::error::*;
use crate::{crypto, DigestAlgorithm};
/// A utility for hashing payloads. Feed your entity body to this, then pass the `finish`
/// result to a request or response.
pub struct PayloadHasher(Box<dyn crypto::Hasher>);
impl PayloadHasher {
/// Create a new PayloadHasher. The `content_type` should be lower-case and should
/// not include parameters. The digest is assumed to be the same as the digest used
/// for the credentials in the request.
pub fn new<B>(content_type: B, algorithm: DigestAlgorithm) -> Result<Self>
where
B: AsRef<[u8]>,
{
let mut hasher = PayloadHasher(crypto::new_hasher(algorithm)?);
hasher.update(b"hawk.1.payload\n")?;
hasher.update(content_type.as_ref())?;
hasher.update(b"\n")?;
Ok(hasher)
}
/// Hash a single value and return it
pub fn hash<B1, B2>(
content_type: B1,
algorithm: DigestAlgorithm,
payload: B2,
) -> Result<Vec<u8>>
where
B1: AsRef<[u8]>,
B2: AsRef<[u8]>,
{
let mut hasher = PayloadHasher::new(content_type, algorithm)?;
hasher.update(payload)?;
hasher.finish()
}
/// Update the hash with new data.
pub fn update<B>(&mut self, data: B) -> Result<()>
where
B: AsRef<[u8]>,
{
self.0.update(data.as_ref())?;
Ok(())
}
/// Finish hashing and return the result
///
/// Note that this appends a newline to the payload, as does the JS Hawk implementaiton.
pub fn finish(mut self) -> Result<Vec<u8>> {
self.update(b"\n")?;
Ok(self.0.finish()?)
}
}
#[cfg(all(test, any(feature = "use_ring", feature = "use_openssl")))]
mod tests {
use super::PayloadHasher;
#[test]
fn hash_consistency() -> super::Result<()> {
let mut hasher1 = PayloadHasher::new("text/plain", crate::SHA256)?;
hasher1.update("pày")?;
hasher1.update("load")?;
let hash1 = hasher1.finish()?;
let mut hasher2 = PayloadHasher::new("text/plain", crate::SHA256)?;
hasher2.update("pàyload")?;
let hash2 = hasher2.finish()?;
let hash3 = PayloadHasher::hash("text/plain", crate::SHA256, "pàyload")?;
let hash4 = // "pàyload" as utf-8 bytes
PayloadHasher::hash("text/plain", crate::SHA256, vec![112, 195, 160, 121, 108, 111, 97, 100])?;
assert_eq!(
hash1,
vec![
228, 238, 241, 224, 235, 114, 158, 112, 211, 254, 118, 89, 25, 236, 87, 176, 181,
54, 61, 135, 42, 223, 188, 103, 194, 59, 83, 36, 136, 31, 198, 50
]
);
assert_eq!(hash2, hash1);
assert_eq!(hash3, hash1);
assert_eq!(hash4, hash1);
Ok(())
}
}
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