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Thank you for the answer. We are using the Makefile from OpenSSL
to compile our feature as it changes OpenSSL directly. As I
understood it, we would have to import another number library to
compile our code with the standard OpenSSL settings and using the
logarithm, correct?
On 2019-07-24 6:51 p.m., Guido Vranken
wrote:
If you want to use the log() from math.h, then you must
compile with -lm, eg.: clang source.c -lm
The log() in math.h only supports floating point numbers.
If you require computing logarithms of bignums, try https://www.mpfr.org/
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
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