Support multi-valued signatures in CSRs.
* src/certreq.c (ksba_certreq_set_sig_val): Support signatures made of several values.
The current implementation of ksba_certreq_set_sig_val takes
only the first MPI value in the provided S-expression to build
the CSR signature. This is enough for RSA, but not for ECDSA
since a ECDSA signature is made of two values.
This patch makes sure all values are taken into account. It
also partially replaces some of the ad-hoc parsing code by
the helper functions defined in sexp-parse.h.
- GnuPG-bug-id: T4092
- Signed-off-by: Damien Goutte-Gattat <email@example.com>