bi_add

@brief Perform an addition operation between two bigints.

bigint *bi_add(
　　BI_CTX * ctx
　　bigint * bia
　　bigint * bib
)

ctx

bia

bib

@brief Perform an addition operation between two bigints.
@param ctx [in]  The bigint session context.
@param bia [in]  A bigint.
@param bib [in]  Another bigint.
@return The result of the addition.