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Update after feedback from #3492

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* Allocate internal representation contexts on the heap (i.e. don't change
  where they're being allocated)
* Unify load_xxx_representation in terms of allocation and init behaviour

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
This commit is contained in:
Steven Cooreman 2020-07-28 14:30:39 +02:00
parent 75b743666e
commit a2371e53e4
1 changed files with 111 additions and 79 deletions
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190
library/psa_crypto.c
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@ -520,14 +520,14 @@ static psa_status_t psa_check_rsa_key_byte_aligned(
/** Load the contents of a key slot into an internal RSA representation
*
* \param[in] slot The slot from which to load the representation
* \param[out] rsa The internal RSA representation to hold the key. Must be
* allocated and initialized. If it already holds a
* different key, it will be overwritten and cause a memory
* leak.
* \param[in] slot The slot from which to load the representation
* \param[out] p_rsa Returns a pointer to an RSA context on success.
* The caller is responsible for freeing both the
* contents of the context and the context itself
* when done.
*/
static psa_status_t psa_load_rsa_representation( const psa_key_slot_t *slot,
mbedtls_rsa_context *rsa )
mbedtls_rsa_context **p_rsa )
{
#if defined(MBEDTLS_PK_PARSE_C)
psa_status_t status;
@ -567,9 +567,10 @@ static psa_status_t psa_load_rsa_representation( const psa_key_slot_t *slot,
if( status != PSA_SUCCESS )
goto exit;
/* Copy the PK-contained RSA context to the one provided as function input */
status = mbedtls_to_psa_error(
mbedtls_rsa_copy( rsa, mbedtls_pk_rsa( ctx ) ) );
/* Copy out the pointer to the RSA context, and reset the PK context
* such that pk_free doesn't free the RSA context we just grabbed. */
*p_rsa = mbedtls_pk_rsa( ctx );
ctx.pk_info = NULL;
exit:
mbedtls_pk_free( &ctx );
@ -653,8 +654,7 @@ static psa_status_t psa_import_rsa_key( psa_key_slot_t *slot,
{
psa_status_t status;
uint8_t* output = NULL;
mbedtls_rsa_context rsa;
mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE );
mbedtls_rsa_context *rsa = NULL;
/* Temporarily load input into slot. The cast here is safe since it'll
* only be used for load_rsa_representation, which doesn't modify the
@ -668,7 +668,7 @@ static psa_status_t psa_import_rsa_key( psa_key_slot_t *slot,
goto exit;
slot->attr.bits = (psa_key_bits_t) PSA_BYTES_TO_BITS(
mbedtls_rsa_get_len( &rsa ) );
mbedtls_rsa_get_len( rsa ) );
/* Re-export the data to PSA export format, such that we can store export
* representation in the key slot. Export representation in case of RSA is
@ -683,14 +683,16 @@ static psa_status_t psa_import_rsa_key( psa_key_slot_t *slot,
}
status = psa_export_rsa_key( slot->attr.type,
&rsa,
rsa,
output,
data_length,
&data_length);
exit:
/* Always free the RSA object */
mbedtls_rsa_free( &rsa );
mbedtls_rsa_free( rsa );
if( rsa != NULL )
mbedtls_free( rsa );
/* Free the allocated buffer only on error. */
if( status != PSA_SUCCESS )
@ -710,15 +712,24 @@ exit:
#endif /* defined(MBEDTLS_RSA_C) */
#if defined(MBEDTLS_ECP_C)
/* Load the key slot contents into an mbedTLS internal representation object.
* Note: caller is responsible for freeing the object properly */
/** Load the contents of a key slot into an internal ECP representation
*
* \param[in] slot The slot from which to load the representation
* \param[out] p_ecp Returns a pointer to an ECP context on success.
* The caller is responsible for freeing both the
* contents of the context and the context itself
* when done.
*/
static psa_status_t psa_load_ecp_representation( const psa_key_slot_t *slot,
mbedtls_ecp_keypair *ecp )
mbedtls_ecp_keypair **p_ecp )
{
mbedtls_ecp_group_id grp_id = MBEDTLS_ECP_DP_NONE;
size_t data_length = slot->data.key.bytes;
psa_status_t status;
mbedtls_ecp_keypair_init( ecp );
mbedtls_ecp_keypair *ecp = mbedtls_calloc(1, sizeof(mbedtls_ecp_keypair));
if( ecp == NULL )
return PSA_ERROR_INSUFFICIENT_MEMORY;
if( PSA_KEY_TYPE_IS_PUBLIC_KEY( slot->attr.type ) )
{
@ -733,6 +744,8 @@ static psa_status_t psa_load_ecp_representation( const psa_key_slot_t *slot,
data_length = slot->data.key.bytes / 2;
}
mbedtls_ecp_keypair_init( ecp );
/* Load the group. */
grp_id = mbedtls_ecc_group_of_psa( PSA_KEY_TYPE_ECC_GET_FAMILY( slot->attr.type),
data_length );
@ -777,9 +790,15 @@ static psa_status_t psa_load_ecp_representation( const psa_key_slot_t *slot,
if( status != PSA_SUCCESS )
goto exit;
}
*p_ecp = ecp;
exit:
if( status != PSA_SUCCESS )
{
mbedtls_ecp_keypair_free( ecp );
mbedtls_free( ecp );
}
return status;
}
@ -835,7 +854,7 @@ static psa_status_t psa_import_ecp_key( psa_key_slot_t *slot,
{
psa_status_t status;
uint8_t* output = NULL;
mbedtls_ecp_keypair ecp;
mbedtls_ecp_keypair *ecp = NULL;
/* Temporarily load input into slot. The cast here is safe since it'll
* only be used for load_ecp_representation, which doesn't modify the
@ -849,9 +868,9 @@ static psa_status_t psa_import_ecp_key( psa_key_slot_t *slot,
goto exit;
if( PSA_KEY_TYPE_ECC_GET_FAMILY( slot->attr.type ) == PSA_ECC_FAMILY_MONTGOMERY)
slot->attr.bits = (psa_key_bits_t) ecp.grp.nbits + 1;
slot->attr.bits = (psa_key_bits_t) ecp->grp.nbits + 1;
else
slot->attr.bits = (psa_key_bits_t) ecp.grp.nbits;
slot->attr.bits = (psa_key_bits_t) ecp->grp.nbits;
/* Re-export the data to PSA export format. There is currently no support
* for other input formats then the export format, so this is a 1-1
@ -865,14 +884,16 @@ static psa_status_t psa_import_ecp_key( psa_key_slot_t *slot,
}
status = psa_export_ecp_key( slot->attr.type,
&ecp,
ecp,
output,
data_length,
&data_length);
exit:
/* Always free the PK object (will also free contained RSA context) */
mbedtls_ecp_keypair_free( &ecp );
/* Always free the PK object (will also free contained ECP context) */
mbedtls_ecp_keypair_free( ecp );
if( ecp != NULL )
mbedtls_free( ecp );
/* Free the allocated buffer only on error. */
if( status != PSA_SUCCESS )
@ -1419,16 +1440,16 @@ psa_status_t psa_get_key_attributes( psa_key_handle_t handle,
break;
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
{
mbedtls_rsa_context rsa;
mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE );
mbedtls_rsa_context *rsa = NULL;
status = psa_load_rsa_representation( slot, &rsa );
if( status != PSA_SUCCESS )
break;
status = psa_get_rsa_public_exponent( &rsa,
status = psa_get_rsa_public_exponent( rsa,
attributes );
mbedtls_rsa_free( &rsa );
mbedtls_rsa_free( rsa );
mbedtls_free( rsa );
}
break;
#endif /* MBEDTLS_RSA_C */
@ -1532,20 +1553,19 @@ static psa_status_t psa_internal_export_key( const psa_key_slot_t *slot,
if( PSA_KEY_TYPE_IS_RSA( slot->attr.type ) )
{
#if defined(MBEDTLS_RSA_C)
mbedtls_rsa_context rsa;
mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE );
mbedtls_rsa_context *rsa = NULL;
psa_status_t status = psa_load_rsa_representation( slot, &rsa );
if( status != PSA_SUCCESS )
return status;
status = psa_export_rsa_key( PSA_KEY_TYPE_RSA_PUBLIC_KEY,
&rsa,
rsa,
data,
data_size,
data_length );
mbedtls_rsa_free( &rsa );
mbedtls_rsa_free( rsa );
mbedtls_free( rsa );
return( status );
#else
@ -1556,7 +1576,7 @@ static psa_status_t psa_internal_export_key( const psa_key_slot_t *slot,
else
{
#if defined(MBEDTLS_ECP_C)
mbedtls_ecp_keypair ecp;
mbedtls_ecp_keypair *ecp = NULL;
psa_status_t status = psa_load_ecp_representation( slot, &ecp );
if( status != PSA_SUCCESS )
return status;
@ -1564,12 +1584,13 @@ static psa_status_t psa_internal_export_key( const psa_key_slot_t *slot,
status = psa_export_ecp_key( PSA_KEY_TYPE_ECC_PUBLIC_KEY(
PSA_KEY_TYPE_ECC_GET_FAMILY(
slot->attr.type ) ),
&ecp,
ecp,
data,
data_size,
data_length );
mbedtls_ecp_keypair_free( &ecp );
mbedtls_ecp_keypair_free( ecp );
mbedtls_free( ecp );
return( status );
#else
/* We don't know how to convert a private ECC key to public */
@ -1980,8 +2001,7 @@ static psa_status_t psa_validate_optional_attributes(
#if defined(MBEDTLS_RSA_C)
if( PSA_KEY_TYPE_IS_RSA( slot->attr.type ) )
{
mbedtls_rsa_context rsa;
mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE );
mbedtls_rsa_context *rsa = NULL;
mbedtls_mpi actual, required;
psa_status_t status = psa_load_rsa_representation( slot, &rsa );
@ -1991,9 +2011,10 @@ static psa_status_t psa_validate_optional_attributes(
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_mpi_init( &actual );
mbedtls_mpi_init( &required );
ret = mbedtls_rsa_export( &rsa,
ret = mbedtls_rsa_export( rsa,
NULL, NULL, NULL, NULL, &actual );
mbedtls_rsa_free( &rsa );
mbedtls_rsa_free( rsa );
mbedtls_free( rsa );
if( ret != 0 )
goto rsa_exit;
ret = mbedtls_mpi_read_binary( &required,
@ -3638,21 +3659,21 @@ psa_status_t psa_sign_hash( psa_key_handle_t handle,
#if defined(MBEDTLS_RSA_C)
if( slot->attr.type == PSA_KEY_TYPE_RSA_KEY_PAIR )
{
mbedtls_rsa_context rsa;
mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE );
mbedtls_rsa_context *rsa = NULL;
status = psa_load_rsa_representation( slot,
&rsa );
if( status != PSA_SUCCESS )
goto exit;
status = psa_rsa_sign( &rsa,
status = psa_rsa_sign( rsa,
alg,
hash, hash_length,
signature, signature_size,
signature_length );
mbedtls_rsa_free( &rsa );
mbedtls_rsa_free( rsa );
mbedtls_free( rsa );
}
else
#endif /* defined(MBEDTLS_RSA_C) */
@ -3668,16 +3689,17 @@ psa_status_t psa_sign_hash( psa_key_handle_t handle,
#endif
)
{
mbedtls_ecp_keypair ecp;
mbedtls_ecp_keypair *ecp = NULL;
status = psa_load_ecp_representation( slot, &ecp );
if( status != PSA_SUCCESS )
goto exit;
status = psa_ecdsa_sign( &ecp,
status = psa_ecdsa_sign( ecp,
alg,
hash, hash_length,
signature, signature_size,
signature_length );
mbedtls_ecp_keypair_free( &ecp );
mbedtls_ecp_keypair_free( ecp );
mbedtls_free( ecp );
}
else
#endif /* defined(MBEDTLS_ECDSA_C) */
@ -3741,18 +3763,18 @@ psa_status_t psa_verify_hash( psa_key_handle_t handle,
#if defined(MBEDTLS_RSA_C)
if( PSA_KEY_TYPE_IS_RSA( slot->attr.type ) )
{
mbedtls_rsa_context rsa;
mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE );
mbedtls_rsa_context *rsa = NULL;
status = psa_load_rsa_representation( slot, &rsa );
if( status != PSA_SUCCESS )
return status;
status = psa_rsa_verify( &rsa,
status = psa_rsa_verify( rsa,
alg,
hash, hash_length,
signature, signature_length );
mbedtls_rsa_free( &rsa );
mbedtls_rsa_free( rsa );
mbedtls_free( rsa );
return( status );
}
else
@ -3763,14 +3785,15 @@ psa_status_t psa_verify_hash( psa_key_handle_t handle,
#if defined(MBEDTLS_ECDSA_C)
if( PSA_ALG_IS_ECDSA( alg ) )
{
mbedtls_ecp_keypair ecp;
mbedtls_ecp_keypair *ecp = NULL;
status = psa_load_ecp_representation( slot, &ecp );
if( status != PSA_SUCCESS )
return status;
status = psa_ecdsa_verify( &ecp,
status = psa_ecdsa_verify( ecp,
hash, hash_length,
signature, signature_length );
mbedtls_ecp_keypair_free( &ecp );
mbedtls_ecp_keypair_free( ecp );
mbedtls_free( ecp );
return status;
}
else
@ -3831,22 +3854,23 @@ psa_status_t psa_asymmetric_encrypt( psa_key_handle_t handle,
#if defined(MBEDTLS_RSA_C)
if( PSA_KEY_TYPE_IS_RSA( slot->attr.type ) )
{
mbedtls_rsa_context rsa;
mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE );
mbedtls_rsa_context *rsa = NULL;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
status = psa_load_rsa_representation( slot, &rsa );
if( status != PSA_SUCCESS )
return status;
if( output_size < mbedtls_rsa_get_len( &rsa ) )
if( output_size < mbedtls_rsa_get_len( rsa ) )
{
mbedtls_rsa_free( &rsa );
mbedtls_rsa_free( rsa );
mbedtls_free( rsa );
return( PSA_ERROR_BUFFER_TOO_SMALL );
}
#if defined(MBEDTLS_PKCS1_V15)
if( alg == PSA_ALG_RSA_PKCS1V15_CRYPT )
{
ret = mbedtls_rsa_pkcs1_encrypt( &rsa,
ret = mbedtls_rsa_pkcs1_encrypt( rsa,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg,
MBEDTLS_RSA_PUBLIC,
@ -3859,8 +3883,8 @@ psa_status_t psa_asymmetric_encrypt( psa_key_handle_t handle,
#if defined(MBEDTLS_PKCS1_V21)
if( PSA_ALG_IS_RSA_OAEP( alg ) )
{
psa_rsa_oaep_set_padding_mode( alg, &rsa );
ret = mbedtls_rsa_rsaes_oaep_encrypt( &rsa,
psa_rsa_oaep_set_padding_mode( alg, rsa );
ret = mbedtls_rsa_rsaes_oaep_encrypt( rsa,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg,
MBEDTLS_RSA_PUBLIC,
@ -3872,13 +3896,15 @@ psa_status_t psa_asymmetric_encrypt( psa_key_handle_t handle,
else
#endif /* MBEDTLS_PKCS1_V21 */
{
mbedtls_rsa_free( &rsa );
mbedtls_rsa_free( rsa );
mbedtls_free( rsa );
return( PSA_ERROR_INVALID_ARGUMENT );
}
if( ret == 0 )
*output_length = mbedtls_rsa_get_len( &rsa );
*output_length = mbedtls_rsa_get_len( rsa );
mbedtls_rsa_free( &rsa );
mbedtls_rsa_free( rsa );
mbedtls_free( rsa );
return( mbedtls_to_psa_error( ret ) );
}
else
@ -3921,24 +3947,24 @@ psa_status_t psa_asymmetric_decrypt( psa_key_handle_t handle,
#if defined(MBEDTLS_RSA_C)
if( slot->attr.type == PSA_KEY_TYPE_RSA_KEY_PAIR )
{
mbedtls_rsa_context rsa;
mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE );
mbedtls_rsa_context *rsa;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
status = psa_load_rsa_representation( slot, &rsa );
if( status != PSA_SUCCESS )
return status;
if( input_length != mbedtls_rsa_get_len( &rsa ) )
if( input_length != mbedtls_rsa_get_len( rsa ) )
{
mbedtls_rsa_free( &rsa );
mbedtls_rsa_free( rsa );
mbedtls_free( rsa );
return( PSA_ERROR_INVALID_ARGUMENT );
}
#if defined(MBEDTLS_PKCS1_V15)
if( alg == PSA_ALG_RSA_PKCS1V15_CRYPT )
{
ret = mbedtls_rsa_pkcs1_decrypt( &rsa,
ret = mbedtls_rsa_pkcs1_decrypt( rsa,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg,
MBEDTLS_RSA_PRIVATE,
@ -3952,8 +3978,8 @@ psa_status_t psa_asymmetric_decrypt( psa_key_handle_t handle,
#if defined(MBEDTLS_PKCS1_V21)
if( PSA_ALG_IS_RSA_OAEP( alg ) )
{
psa_rsa_oaep_set_padding_mode( alg, &rsa );
ret = mbedtls_rsa_rsaes_oaep_decrypt( &rsa,
psa_rsa_oaep_set_padding_mode( alg, rsa );
ret = mbedtls_rsa_rsaes_oaep_decrypt( rsa,
mbedtls_ctr_drbg_random,
&global_data.ctr_drbg,
MBEDTLS_RSA_PRIVATE,
@ -3966,11 +3992,13 @@ psa_status_t psa_asymmetric_decrypt( psa_key_handle_t handle,
else
#endif /* MBEDTLS_PKCS1_V21 */
{
mbedtls_rsa_free( &rsa );
mbedtls_rsa_free( rsa );
mbedtls_free( rsa );
return( PSA_ERROR_INVALID_ARGUMENT );
}
mbedtls_rsa_free( &rsa );
mbedtls_rsa_free( rsa );
mbedtls_free( rsa );
return( mbedtls_to_psa_error( ret ) );
}
else
@ -5521,7 +5549,7 @@ static psa_status_t psa_key_agreement_ecdh( const uint8_t *peer_key,
size_t shared_secret_size,
size_t *shared_secret_length )
{
mbedtls_ecp_keypair their_key;
mbedtls_ecp_keypair *their_key;
psa_key_slot_t their_key_slot;
mbedtls_ecdh_context ecdh;
psa_status_t status;
@ -5540,7 +5568,7 @@ static psa_status_t psa_key_agreement_ecdh( const uint8_t *peer_key,
goto exit;
status = mbedtls_to_psa_error(
mbedtls_ecdh_get_params( &ecdh, &their_key, MBEDTLS_ECDH_THEIRS ) );
mbedtls_ecdh_get_params( &ecdh, their_key, MBEDTLS_ECDH_THEIRS ) );
if( status != PSA_SUCCESS )
goto exit;
status = mbedtls_to_psa_error(
@ -5563,7 +5591,10 @@ exit:
if( status != PSA_SUCCESS )
mbedtls_platform_zeroize( shared_secret, shared_secret_size );
mbedtls_ecdh_free( &ecdh );
mbedtls_ecp_keypair_free( &their_key );
mbedtls_ecp_keypair_free( their_key );
if( their_key != NULL)
mbedtls_free( their_key );
return( status );
}
#endif /* MBEDTLS_ECDH_C */
@ -5584,15 +5615,16 @@ static psa_status_t psa_key_agreement_raw_internal( psa_algorithm_t alg,
case PSA_ALG_ECDH:
if( ! PSA_KEY_TYPE_IS_ECC_KEY_PAIR( private_key->attr.type ) )
return( PSA_ERROR_INVALID_ARGUMENT );
mbedtls_ecp_keypair ecp;
mbedtls_ecp_keypair *ecp = NULL;
psa_status_t status = psa_load_ecp_representation( private_key, &ecp );
if( status != PSA_SUCCESS )
return status;
status = psa_key_agreement_ecdh( peer_key, peer_key_length,
&ecp,
ecp,
shared_secret, shared_secret_size,
shared_secret_length );
mbedtls_ecp_keypair_free( &ecp );
mbedtls_ecp_keypair_free( ecp );
mbedtls_free( ecp );
return status;
#endif /* MBEDTLS_ECDH_C */
default: