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Add a constant time zero check function for 64-bit integers

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Signed-off-by: Amitay Isaacs <amitay@ozlabs.org>

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14784)
This commit is contained in:
Amitay Isaacs 2021-02-01 16:20:12 +11:00 committed by Matt Caswell
parent eb7bcff67c
commit ceaa6b319e
1 changed files with 5 additions and 0 deletions
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5
include/internal/constant_time.h
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@ -182,6 +182,11 @@ static ossl_inline uint32_t constant_time_is_zero_32(uint32_t a)
return constant_time_msb_32(~a & (a - 1));
}
static ossl_inline uint64_t constant_time_is_zero_64(uint64_t a)
{
return constant_time_msb_64(~a & (a - 1));
}
static ossl_inline unsigned int constant_time_eq(unsigned int a,
unsigned int b)
{