Bug calculation carry/borrow when right=0xFFFFFFFF and carry/borrow=1 #227
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Bug in uECC_vli_add and uECC_vli_sub
Error appear when oper2 = 0xFFFFFFFF and previous carry=1
i.e with 8 bits:
oper1: 83 + oper2: FF ------ F+3= 12 1+8+F= 18 // carry = (sum < left[i]) --> carry = (8<8) --> carry = 0 (Incorrect) ------ 182 // Correct resultEquivalent error appears in the calculation of borrow in uECC_vli_sub