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mbedcrypto: Make bignum_bn2dec() return char*.

Simon Josefssonrequested to merge
jas/libssh-mirror:jas/mbed-unsigned into master

Noticed while developing bignum self-checks (upcoming merge request).

This aligns it with libgcrypt/OpenSSL backends which uses char*. It also aligns mbedcrypto's bignum_bn2hex() to use an unsigned cast just like OpenSSL backend.

Checklist

  • Commits have Signed-off-by: with name/author being identical to the commit author
  • Code modified for feature
  • Test suite updated with functionality tests
  • Test suite updated with negative tests
  • Documentation updated

Reviewer's checklist:

  • Any issues marked for closing are addressed
  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTING.md
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code

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