Use as instead of unwrap().

src/kem/kyber768/compress.rs

@@ -30,7 +30,7 @@ fn compress_q(fe: KyberFieldElement, to_bit_size: usize) -> KyberFieldElement {
     compressed /= u32::from(KyberFieldElement::MODULUS << 1);
 
     KyberFieldElement {
-        value: (compressed & (two_pow_bit_size - 1)).try_into().unwrap()
+        value: (compressed & (two_pow_bit_size - 1)) as u16
     }
 }
 
@@ -42,6 +42,6 @@ fn decompress_q(fe: KyberFieldElement, to_bit_size: usize) -> KyberFieldElement
     decompressed >>= to_bit_size + 1;
 
     KyberFieldElement {
-        value: decompressed.try_into().unwrap()
+        value: decompressed as u16
     }
 }

src/kem/kyber768/field_element.rs

@@ -15,10 +15,10 @@ impl KyberFieldElement {
 
     pub fn barrett_reduce(value : u32) -> Self {
         let product : u64 = u64::from(value) * u64::from(Self::BARRETT_MULTIPLIER);
-        let quotient : u32 = (product >> Self::BARRETT_SHIFT).try_into().unwrap();
+        let quotient : u32 = (product >> Self::BARRETT_SHIFT) as u32;
 
         let remainder = value - (quotient * u32::from(Self::MODULUS));
-        let remainder : u16 = remainder.try_into().unwrap();
+        let remainder : u16 = remainder as u16;
 
         let remainder_minus_modulus = remainder.wrapping_sub(Self::MODULUS);
 

src/kem/kyber768/sampling.rs

@@ -60,7 +60,7 @@ pub fn sample_from_binomial_distribution_with_2_coins(
             let outcome_2: u8 = ((coin_toss_outcomes >> (outcome_set + 2)) & 0x3) as u8;
             let outcome_2: KyberFieldElement = outcome_2.into();
 
-            let offset = usize::try_from(outcome_set >> 2).unwrap();
+            let offset = (outcome_set >> 2) as usize;
             sampled[8 * chunk_number + offset] = outcome_1 - outcome_2;
         }
     }