Gilles Peskine 96449ceebe mbedtls_ecp_gen_privkey_mx: remove the exception for all-zero
The library rejected an RNG input of all-bits-zero, which led to the
key 2^{254} (for Curve25519) having a 31/32 chance of being generated
compared to other keys. This had no practical impact because the
probability of non-compliance was 2^{-256}, but needlessly
complicated the code.

The exception was added in 98e28a74e33f32bcb855e16f8d5d2016b2102129 to
avoid the case where b - 1 wraps because b is 0. Instead, change the
comparison code to avoid calculating b - 1.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-06-03 18:10:04 +02:00
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