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Author SHA1 Message Date
Gilles Peskine 70a7dcda3f Fix multiplication producing a negative zero 
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>
 2021-06-22 12:39:17 +02:00
Gilles Peskine 8f28c24b4a Explain the problem in more concrete terms 
Don't try to make the reader guess what a “negative zero” might mean.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2021-04-09 20:20:26 +02:00
Gilles Peskine fd4fab0b24 mbedtls_mpi_read_string("-0") no longer produces a "negative zero" 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
 2021-04-09 17:13:15 +02:00