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Explain why we check 65535 (not USHORT_MAX)

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2023-07-18 13:41:22 +02:00
parent b8f18850c6
commit 24a305ec22
1 changed files with 6 additions and 0 deletions
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6
include/mbedtls/bignum.h
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@ -224,6 +224,12 @@ typedef struct mbedtls_mpi {
/** Total number of limbs in \c p. */ /** Total number of limbs in \c p. */
unsigned short MBEDTLS_PRIVATE(n); unsigned short MBEDTLS_PRIVATE(n);
/* Make sure that MBEDTLS_MPI_MAX_LIMBS fits in n.
* Use the same limit value on all platforms so that we don't have to
* think about different behavior on the rare platforms where
* unsigned short can store values larger than the minimum required by
* the C language, which is 65535.
*/
#if MBEDTLS_MPI_MAX_LIMBS > 65535 #if MBEDTLS_MPI_MAX_LIMBS > 65535
#error "MBEDTLS_MPI_MAX_LIMBS > 65535 is not supported" #error "MBEDTLS_MPI_MAX_LIMBS > 65535 is not supported"
#endif #endif