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avoid errorneous computation of RSA_PRV_DER_MAX_BYTES.

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if MBEDTLS_MPI_MAX_SIZE is odd then RSA_PRV_DER_MAX_BYTES will be two less than expected, since the macros are lacking parentheses.


Signed-off-by: Daniel Otte <d.otte@wut.de>
This commit is contained in:
Daniel Otte 2021-02-01 14:23:30 +01:00
parent 5d453ee882
commit 80a2c2a5f9
1 changed files with 2 additions and 2 deletions
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4
library/pkwrite.c
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@ -472,8 +472,8 @@ int mbedtls_pk_write_key_der( mbedtls_pk_context *key, unsigned char *buf, size_
* otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported) * otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported)
* } * }
*/ */
#define MPI_MAX_SIZE_2 MBEDTLS_MPI_MAX_SIZE / 2 + \ #define MPI_MAX_SIZE_2 ( MBEDTLS_MPI_MAX_SIZE / 2 + \
MBEDTLS_MPI_MAX_SIZE % 2 MBEDTLS_MPI_MAX_SIZE % 2 )
#define RSA_PRV_DER_MAX_BYTES 47 + 3 * MBEDTLS_MPI_MAX_SIZE \ #define RSA_PRV_DER_MAX_BYTES 47 + 3 * MBEDTLS_MPI_MAX_SIZE \
+ 5 * MPI_MAX_SIZE_2 + 5 * MPI_MAX_SIZE_2