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Fix multiplication producing a negative zero

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Fix mbedtls_mpi_mul_mpi() when one of the operands is zero and the
other is negative. The sign of the result must be 1, since some
library functions do not treat {-1, 0, NULL} or {-1, n, {0}} as
representing the value 0.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-06-10 15:51:54 +02:00
parent b4347d859b
commit f4998b0a20
3 changed files with 23 additions and 3 deletions
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@@ -81,8 +81,12 @@ Bugfix
in line with version 1.0.0 of the specification. Fix #4162.
* Fix a bug in ECDSA that would cause it to fail when the hash is all-bits
zero. Fixes #1792
* mbedtls_mpi_read_string on "-0" produced an MPI object that was not treated
as equal to 0 in all cases. Fix it to produce the same object as "0".
* 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.
Changes
* Fix the setting of the read timeout in the DTLS sample programs.