Adding large numbers
The sodium_add() function accepts two arrays of unsigned numbers encoded in little- endian format, a and b, both of size len bytes. It computes (a + b) mod 2^(8*len) in constant time for a given length, and overwrites a with the result.
NoGcException, if a_.length != b.length
https://download.libsodium.org/doc/helpers#adding-large-numbers
See Implementation
This function was introduced in libsodium 1.0.7.
Adding large numbers
The sodium_add() function accepts two arrays of unsigned numbers encoded in little- endian format, a and b, both of size len bytes. It computes (a + b) mod 2^(8*len) in constant time for a given length, and overwrites a with the result.