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Correct some comments about ECC in mbedtls_mpi_random

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-04-15 11:45:19 +02:00
parent 346d20d209
commit 3f61363f8d
1 changed files with 2 additions and 3 deletions
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5
library/bignum.c
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@ -2460,7 +2460,6 @@ int mbedtls_mpi_random( mbedtls_mpi *X,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
/* SEC1 3.2.1: Generate X such that 1 <= n < N */
int ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
int count;
unsigned cmp = 0;
@ -2478,9 +2477,9 @@ int mbedtls_mpi_random( mbedtls_mpi *X,
* be < N), so after 30 tries failure probability is a most 2**(-30).
*
* When N is just below a power of 2, as is the case when generating
* a random point on most elliptic curves, 1 try is enough with
* a random scalar on most elliptic curves, 1 try is enough with
* overwhelming probability. When N is just above a power of 2,
* as when generating a random point on secp224k1, each try has
* as when generating a random scalar on secp224k1, each try has
* a probability of failing that is almost 1/2.
*
* The probabilities are almost the same if min is nonzero but negligible