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Ensure input parameter size for Koblitz reduction

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Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
This commit is contained in:
Gabor Mezei 2023-04-21 17:28:25 +02:00
parent 8183c5dcc3
commit 7097447b84
No known key found for this signature in database
GPG key ID: FEE76C0CF8C6267D
1 changed files with 21 additions and 3 deletions
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24
library/ecp_curves.c
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@ -5597,7 +5597,13 @@ cleanup:
*/
static int ecp_mod_p192k1(mbedtls_mpi *N)
{
return mbedtls_ecp_mod_p192k1(N);
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t expected_width = 2 * ((192 + biL - 1) / biL);
MBEDTLS_MPI_CHK(mbedtls_mpi_grow(N, expected_width));
ret = mbedtls_ecp_mod_p192k1(N);
cleanup:
return ret;
}
MBEDTLS_STATIC_TESTABLE
@ -5618,7 +5624,13 @@ int mbedtls_ecp_mod_p192k1(mbedtls_mpi *N)
static int ecp_mod_p224k1(mbedtls_mpi *N)
{
return mbedtls_ecp_mod_p224k1(N);
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t expected_width = 2 * 224 / biL;
MBEDTLS_MPI_CHK(mbedtls_mpi_grow(N, expected_width));
ret = mbedtls_ecp_mod_p224k1(N);
cleanup:
return ret;
}
/*
@ -5647,7 +5659,13 @@ int mbedtls_ecp_mod_p224k1(mbedtls_mpi *N)
static int ecp_mod_p256k1(mbedtls_mpi *N)
{
return mbedtls_ecp_mod_p256k1(N);
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t expected_width = 2 * ((256 + biL - 1) / biL);
MBEDTLS_MPI_CHK(mbedtls_mpi_grow(N, expected_width));
ret = mbedtls_ecp_mod_p256k1(N);
cleanup:
return ret;
}
/*