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Zeroize internal buffers and variables in MD hashes

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Zeroising of local buffers and variables which are used for calculations in
mbedtls_internal_md*_process() and mbedtls_internal_ripemd160_process()
functions to erase sensitive data from memory.
Checked all function for possible missing zeroisation in MD.

Signed-off-by: gabor-mezei-arm <gabor.mezei@arm.com>
This commit is contained in:
gabor-mezei-arm 2020-08-19 14:03:06 +02:00
parent 5feba8dae1
commit f21639fc2f
No known key found for this signature in database
GPG Key ID: 106F5A41ECC305BD
5 changed files with 32 additions and 1 deletions
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3
ChangeLog.d/zeroizations_of_sensitive_data_in_PKCS5_and_SHA.txt
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@ -1,5 +1,6 @@
Security Security
* Zeroising of local buffers and variables which are used for calculations * Zeroising of local buffers and variables which are used for calculations
in mbedtls_pkcs5_pbkdf2_hmac() and mbedtls_internal_sha*_process() in mbedtls_pkcs5_pbkdf2_hmac(), mbedtls_internal_sha*_process(),
mbedtls_internal_md*_process() and mbedtls_internal_ripemd160_process()
functions to erase sensitive data from memory. Reported by functions to erase sensitive data from memory. Reported by
Johan Malmgren and Johan Uppman Bruce from Sectra. Johan Malmgren and Johan Uppman Bruce from Sectra.

3
library/md2.c
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@ -177,6 +177,9 @@ int mbedtls_internal_md2_process( mbedtls_md2_context *ctx )
t = ctx->cksum[i]; t = ctx->cksum[i];
} }
/* Zeroise variables to clear sensitive data from memory. */
mbedtls_platform_zeroize( &t, sizeof( t ) );
return( 0 ); return( 0 );
} }

7
library/md4.c
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@ -259,6 +259,13 @@ int mbedtls_internal_md4_process( mbedtls_md4_context *ctx,
ctx->state[2] += C; ctx->state[2] += C;
ctx->state[3] += D; ctx->state[3] += D;
/* Zeroise variables to clear sensitive data from memory. */
mbedtls_platform_zeroize( &X, sizeof( X ) );
mbedtls_platform_zeroize( &A, sizeof( A ) );
mbedtls_platform_zeroize( &B, sizeof( B ) );
mbedtls_platform_zeroize( &C, sizeof( C ) );
mbedtls_platform_zeroize( &D, sizeof( D ) );
return( 0 ); return( 0 );
} }

7
library/md5.c
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@ -265,6 +265,13 @@ int mbedtls_internal_md5_process( mbedtls_md5_context *ctx,
ctx->state[2] += C; ctx->state[2] += C;
ctx->state[3] += D; ctx->state[3] += D;
/* Zeroise variables to clear sensitive data from memory. */
mbedtls_platform_zeroize( &X, sizeof( X ) );
mbedtls_platform_zeroize( &A, sizeof( A ) );
mbedtls_platform_zeroize( &B, sizeof( B ) );
mbedtls_platform_zeroize( &C, sizeof( C ) );
mbedtls_platform_zeroize( &D, sizeof( D ) );
return( 0 ); return( 0 );
} }

13
library/ripemd160.c
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@ -328,6 +328,19 @@ int mbedtls_internal_ripemd160_process( mbedtls_ripemd160_context *ctx,
ctx->state[4] = ctx->state[0] + B + Cp; ctx->state[4] = ctx->state[0] + B + Cp;
ctx->state[0] = C; ctx->state[0] = C;
/* Zeroise 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( &Ap, sizeof( Ap ) );
mbedtls_platform_zeroize( &Bp, sizeof( Bp ) );
mbedtls_platform_zeroize( &Cp, sizeof( Cp ) );
mbedtls_platform_zeroize( &Dp, sizeof( Dp ) );
mbedtls_platform_zeroize( &Ep, sizeof( Ep ) );
mbedtls_platform_zeroize( &X, sizeof( X ) );
return( 0 ); return( 0 );
} }