Problem: bn_mul_normal() misbehaves if the size of b is 0. Solution: multiply a with 0, putting the result in r, and return.
Problem: bn_mul_normal() misbehaves if the size of b is 0.
Solution: multiply a with 0, putting the result in r, and return.

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl