BigPow returns a ** b as a big integer.

MustParseBig256 parses s as a 256 bit big integer and panics if the string is invalid.

PaddedBigBytes encodes a big integer as a big-endian byte slice.

ParseBig256 parses s as a 256 bit integer in decimal or hexadecimal syntax.

ReadBits encodes the absolute value of bigint as big-endian bytes.

TernaryXOR operation.

XOR operation.