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fix: Blake3 hash conversion in ram_blowup_regression test #12584

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fix: Blake3 hash conversion in ram_blowup_regression test #12584

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19 changes: 7 additions & 12 deletions noir/noir-repo/test_programs/execution_success/ram_blowup_regression/src/main.nr
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Original file line number Diff line number Diff line change
@@ -1,23 +1,18 @@
global TX_EFFECTS_HASH_INPUT_FIELDS: u32 = 256;

// Convert a 32 byte array to a field element by truncating the final byte
// Convert a 32 byte array to a field element
pub fn field_from_bytes_32_trunc(bytes32: [u8; 32]) -> Field {
// Convert it to a field element
// Use only the first 31 bytes to ensure the result is within the field range
// This is safe because the BN254 field modulus is about 254 bits, which is less than 31 * 8 = 248 bits
let mut v = 1;
let mut high = 0 as Field;
let mut low = 0 as Field;
let mut result = 0 as Field;

for i in 0..15 {
// covers bytes 16..30 (31 is truncated and ignored)
low = low + (bytes32[15 + 15 - i] as Field) * v;
for i in 0..31 {
result = result + (bytes32[30 - i] as Field) * v;
v = v * 256;
// covers bytes 0..14
high = high + (bytes32[14 - i] as Field) * v;
}
// covers byte 15
low = low + (bytes32[15] as Field) * v;

low + high * v
result
}

pub fn blake3_to_field<let N: u32>(bytes_to_hash: [u8; N]) -> Field {
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