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Zeroize internal buffers and variables in PKCS and SHA

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Zeroising of local buffers and variables which are used for calculations in
mbedtls_pkcs5_pbkdf2_hmac() and mbedtls_internal_sha*_process() functions
to erase sensitive data from memory.
Checked all function for possible missing zeroisation in PKCS and SHA.

Signed-off-by: gabor-mezei-arm <gabor.mezei@arm.com>
This commit is contained in:
gabor-mezei-arm
2020-07-30 16:41:25 +02:00
parent 8ed8694199
commit 76749aea78
5 changed files with 30 additions and 0 deletions
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9
library/sha1.c
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@@ -285,6 +285,15 @@ int mbedtls_internal_sha1_process( mbedtls_sha1_context *ctx,
ctx->state[3] += D;
ctx->state[4] += E;
/* Zeroise buffers and variables to clear sensitive data from memory. */
mbedtls_platform_zeroize( &A, sizeof( A ) );
mbedtls_platform_zeroize( &B, sizeof( B ) );
mbedtls_platform_zeroize( &C, sizeof( C ) );
mbedtls_platform_zeroize( &D, sizeof( D ) );
mbedtls_platform_zeroize( &E, sizeof( E ) );
mbedtls_platform_zeroize( &W, sizeof( W ) );
mbedtls_platform_zeroize( &temp, sizeof( temp ) );
return( 0 );
}