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ccm: zeroize buffers before and after usage

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Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek 2020-11-04 13:20:24 +01:00
parent 5eba1d82a2
commit 142f09fb96
1 changed files with 8 additions and 0 deletions
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8
library/ccm.c
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@ -246,6 +246,10 @@ static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length,
if( add_len > 0xFF00 ) if( add_len > 0xFF00 )
return( MBEDTLS_ERR_CCM_BAD_INPUT ); return( MBEDTLS_ERR_CCM_BAD_INPUT );
mbedtls_platform_zeroize( b, 16 );
mbedtls_platform_zeroize( y, 16 );
mbedtls_platform_zeroize( ctr, 16 );
q = (uint_fast8_t) (16 - 1 - iv_len); q = (uint_fast8_t) (16 - 1 - iv_len);
/* /*
@ -390,6 +394,10 @@ static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length,
CTR_CRYPT( y, y, 16 ); CTR_CRYPT( y, y, 16 );
mbedtls_platform_memcpy( tag, y, tag_len ); mbedtls_platform_memcpy( tag, y, tag_len );
mbedtls_platform_zeroize( b, 16 );
mbedtls_platform_zeroize( y, 16 );
mbedtls_platform_zeroize( ctr, 16 );
return( ret ); return( ret );
} }