| Bugfix | |
| * Fix some cases in the bignum module where the library constructed an | |
| unintended representation of the value 0 which was not processed | |
| correctly by some bignum operations. This could happen when | |
| mbedtls_mpi_read_string() was called on "-0", or when | |
| mbedtls_mpi_mul_mpi() and mbedtls_mpi_mul_int() was called with one of | |
| the arguments being negative and the other being 0. Fixes #4643. |