I’m wondering why you need the log function? If you’re measuring performance, could the analysis tool perform the logarithm? A first order approximation to log_2(n) where n is a BIGNUM would be BN_num_bits(n). Pauli -- Dr Paul Dale | Cryptographer | Network Security & Encryption Phone +61 7 3031 7217 Oracle Australia > On 25 Jul 2019, at 2:22 am, Niklas Niere <nniklas@xxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > we are implementing a TLS 1.3 feature into OpenSSL to get an idea of how well our feature performs in a concrete server library. In the feature, we want to use the log function. > > When we try to use the log function from the math.h header, OpenSSL won't compile with the statement that 'log' is a reference to an undefined function. The BigNum library from OpenSSL does also not seem to offer a log function. > > We suspect that the compile error comes from the fact that OpenSSL is C90 compatible but are unsure. Does anyone know how to compute the logarithm of a number in OpenSSL? > > Thanks, > Niklas >
