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rpo: added conversions for digest

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Augusto F. Hack 2023-10-26 14:22:50 +02:00 • committed by Bobbin Threadbare
parent 41f03fbe91
commit f33a982f29
1 changed files with 104 additions and 2 deletions
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106
src/hash/rpo/digest.rs
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@ -175,6 +175,18 @@ impl From<&RpoDigest> for String {
// CONVERSIONS: TO DIGEST
// ================================================================================================
#[derive(Copy, Clone, Debug)]
pub enum RpoDigestError {
/// The provided u64 integer does not fit in the field's moduli.
InvalidInteger,
}
impl From<&[Felt; DIGEST_SIZE]> for RpoDigest {
fn from(value: &[Felt; DIGEST_SIZE]) -> Self {
Self(*value)
}
}
impl From<[Felt; DIGEST_SIZE]> for RpoDigest {
fn from(value: [Felt; DIGEST_SIZE]) -> Self {
Self(value)
@ -200,6 +212,46 @@ impl TryFrom<[u8; DIGEST_BYTES]> for RpoDigest {
}
}
impl TryFrom<&[u8; DIGEST_BYTES]> for RpoDigest {
type Error = HexParseError;
fn try_from(value: &[u8; DIGEST_BYTES]) -> Result<Self, Self::Error> {
(*value).try_into()
}
}
impl TryFrom<&[u8]> for RpoDigest {
type Error = HexParseError;
fn try_from(value: &[u8]) -> Result<Self, Self::Error> {
(*value).try_into()
}
}
impl TryFrom<[u64; DIGEST_SIZE]> for RpoDigest {
type Error = RpoDigestError;
fn try_from(value: [u64; DIGEST_SIZE]) -> Result<Self, RpoDigestError> {
if value[0] >= Felt::MODULUS
|| value[1] >= Felt::MODULUS
|| value[2] >= Felt::MODULUS
|| value[3] >= Felt::MODULUS
{
return Err(RpoDigestError::InvalidInteger);
}
Ok(Self([value[0].into(), value[1].into(), value[2].into(), value[3].into()]))
}
}
impl TryFrom<&[u64; DIGEST_SIZE]> for RpoDigest {
type Error = RpoDigestError;
fn try_from(value: &[u64; DIGEST_SIZE]) -> Result<Self, RpoDigestError> {
(*value).try_into()
}
}
impl TryFrom<&str> for RpoDigest {
type Error = HexParseError;
@ -259,7 +311,8 @@ impl Deserializable for RpoDigest {
#[cfg(test)]
mod tests {
use super::{Deserializable, Felt, RpoDigest, Serializable, DIGEST_BYTES};
use crate::utils::SliceReader;
use crate::utils::string::String;
use crate::{hash::rpo::DIGEST_SIZE, utils::SliceReader};
use rand_utils::rand_value;
#[test]
@ -281,7 +334,6 @@ mod tests {
assert_eq!(d1, d2);
}
#[cfg(feature = "std")]
#[test]
fn digest_encoding() {
let digest = RpoDigest([
@ -296,4 +348,54 @@ mod tests {
assert_eq!(digest, round_trip);
}
#[test]
fn test_conversions() {
let digest = RpoDigest([
Felt::new(rand_value()),
Felt::new(rand_value()),
Felt::new(rand_value()),
Felt::new(rand_value()),
]);
let v: [Felt; DIGEST_SIZE] = digest.into();
let v2: RpoDigest = v.into();
assert_eq!(digest, v2);
let v: [Felt; DIGEST_SIZE] = (&digest).into();
let v2: RpoDigest = v.into();
assert_eq!(digest, v2);
let v: [u64; DIGEST_SIZE] = digest.into();
let v2: RpoDigest = v.try_into().unwrap();
assert_eq!(digest, v2);
let v: [u64; DIGEST_SIZE] = (&digest).into();
let v2: RpoDigest = v.try_into().unwrap();
assert_eq!(digest, v2);
let v: [u8; DIGEST_BYTES] = digest.into();
let v2: RpoDigest = v.try_into().unwrap();
assert_eq!(digest, v2);
let v: [u8; DIGEST_BYTES] = (&digest).into();
let v2: RpoDigest = v.try_into().unwrap();
assert_eq!(digest, v2);
let v: String = digest.into();
let v2: RpoDigest = v.try_into().unwrap();
assert_eq!(digest, v2);
let v: String = (&digest).into();
let v2: RpoDigest = v.try_into().unwrap();
assert_eq!(digest, v2);
let v: [u8; DIGEST_BYTES] = digest.into();
let v2: RpoDigest = (&v).try_into().unwrap();
assert_eq!(digest, v2);
let v: [u8; DIGEST_BYTES] = (&digest).into();
let v2: RpoDigest = (&v).try_into().unwrap();
assert_eq!(digest, v2);
}
}