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syscall_bls12381_decompress_impl

fluentbase_runtime::syscall_handler

Function syscall_bls12381_decompress_impl 

Source 
pub fn syscall_bls12381_decompress_impl(
    x_bytes_le: [u8; 48],
    sign_bit: u32,
) -> Result<[u8; 96], ExitCode>
Expand description

BLS12-381 point decompression.

§Input format

  • x_bytes_le: x-coordinate as 48 bytes in little-endian
  • sign_bit: 0 or 1, indicates which y to recover

§Output

Affine point [y || x] in little-endian (96 bytes total, y first).

§Validation

Returns ExitCode::MalformedBuiltinParams if:

  • sign_bit > 1
  • x-coordinate doesn’t correspond to a valid curve point