Note: this function destructively reverses its input slice - pass a copy if the original is used elsewhere.

Interprets a positive big.Int as a n-bit two's complement signed integer.

Returns whether a + b would be a uint64 overflow.

Interprets a positive big.Int as a 256-bit two's complement signed integer.

Treats the positive big int x as if it contains an embedded n bit signed integer in its least significant bits and extends that sign.

Convert a possibly negative big.Int x to a positive big.Int encoded in two's complement.

Converts a possibly negative big int x into a positive big int encoding a twos complement representation of x truncated to 32 bytes.