mirror of
https://github.com/yuzu-emu/mbedtls.git
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psa_crypto: create random and drbg abstraction
Create wrapper functions around calls to CTR_DRBG and around calls to entropy+DRBG. This is in preparation for allowing alternative DRBG implementations that use the Mbed TLS entropy module, or complete RNG implementations that bypass the entropy module as well. This is purely a refactoring commit. No behavior change. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
parent
90edc99e30
commit
30524eb7e5
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@ -62,7 +62,6 @@
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#include "mbedtls/cipher.h"
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#include "mbedtls/ccm.h"
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#include "mbedtls/cmac.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/des.h"
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#include "mbedtls/ecdh.h"
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#include "mbedtls/ecp.h"
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@ -117,10 +116,7 @@ static int key_type_is_raw_bytes( psa_key_type_t type )
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typedef struct
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{
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void (* entropy_init )( mbedtls_entropy_context *ctx );
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void (* entropy_free )( mbedtls_entropy_context *ctx );
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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mbedtls_psa_random_context_t rng;
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unsigned initialized : 1;
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unsigned rng_state : 2;
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} psa_global_data_t;
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@ -869,7 +865,7 @@ static psa_status_t psa_export_ecp_key( psa_key_type_t type,
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/* Calculate the public key */
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status = mbedtls_to_psa_error(
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mbedtls_ecp_mul( &ecp->grp, &ecp->Q, &ecp->d, &ecp->grp.G,
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mbedtls_ctr_drbg_random, &global_data.ctr_drbg ) );
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mbedtls_psa_get_random, mbedtls_psa_random_state( &global_data.rng ) ) );
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if( status != PSA_SUCCESS )
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return( status );
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}
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@ -3651,8 +3647,8 @@ static psa_status_t psa_rsa_sign( mbedtls_rsa_context *rsa,
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mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V15,
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MBEDTLS_MD_NONE );
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ret = mbedtls_rsa_pkcs1_sign( rsa,
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mbedtls_ctr_drbg_random,
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&global_data.ctr_drbg,
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mbedtls_psa_get_random,
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mbedtls_psa_random_state( &global_data.rng ),
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MBEDTLS_RSA_PRIVATE,
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md_alg,
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(unsigned int) hash_length,
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@ -3666,8 +3662,8 @@ static psa_status_t psa_rsa_sign( mbedtls_rsa_context *rsa,
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{
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mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V21, md_alg );
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ret = mbedtls_rsa_rsassa_pss_sign( rsa,
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mbedtls_ctr_drbg_random,
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&global_data.ctr_drbg,
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mbedtls_psa_get_random,
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mbedtls_psa_random_state( &global_data.rng ),
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MBEDTLS_RSA_PRIVATE,
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MBEDTLS_MD_NONE,
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(unsigned int) hash_length,
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@ -3709,8 +3705,8 @@ static psa_status_t psa_rsa_verify( mbedtls_rsa_context *rsa,
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mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V15,
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MBEDTLS_MD_NONE );
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ret = mbedtls_rsa_pkcs1_verify( rsa,
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mbedtls_ctr_drbg_random,
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&global_data.ctr_drbg,
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mbedtls_psa_get_random,
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mbedtls_psa_random_state( &global_data.rng ),
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MBEDTLS_RSA_PUBLIC,
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md_alg,
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(unsigned int) hash_length,
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@ -3724,8 +3720,8 @@ static psa_status_t psa_rsa_verify( mbedtls_rsa_context *rsa,
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{
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mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V21, md_alg );
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ret = mbedtls_rsa_rsassa_pss_verify( rsa,
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mbedtls_ctr_drbg_random,
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&global_data.ctr_drbg,
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mbedtls_psa_get_random,
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mbedtls_psa_random_state( &global_data.rng ),
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MBEDTLS_RSA_PUBLIC,
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MBEDTLS_MD_NONE,
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(unsigned int) hash_length,
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@ -3782,8 +3778,8 @@ static psa_status_t psa_ecdsa_sign( mbedtls_ecp_keypair *ecp,
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MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign_det_ext( &ecp->grp, &r, &s,
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&ecp->d, hash,
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hash_length, md_alg,
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mbedtls_ctr_drbg_random,
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&global_data.ctr_drbg ) );
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mbedtls_psa_get_random,
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mbedtls_psa_random_state( &global_data.rng ) ) );
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}
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else
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#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) */
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@ -3791,8 +3787,8 @@ static psa_status_t psa_ecdsa_sign( mbedtls_ecp_keypair *ecp,
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(void) alg;
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MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign( &ecp->grp, &r, &s, &ecp->d,
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hash, hash_length,
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mbedtls_ctr_drbg_random,
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&global_data.ctr_drbg ) );
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mbedtls_psa_get_random,
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mbedtls_psa_random_state( &global_data.rng ) ) );
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}
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MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &r,
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@ -3837,7 +3833,7 @@ static psa_status_t psa_ecdsa_verify( mbedtls_ecp_keypair *ecp,
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{
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MBEDTLS_MPI_CHK(
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mbedtls_ecp_mul( &ecp->grp, &ecp->Q, &ecp->d, &ecp->grp.G,
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mbedtls_ctr_drbg_random, &global_data.ctr_drbg ) );
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mbedtls_psa_get_random, mbedtls_psa_random_state( &global_data.rng ) ) );
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}
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ret = mbedtls_ecdsa_verify( &ecp->grp, hash, hash_length,
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@ -4137,8 +4133,8 @@ psa_status_t psa_asymmetric_encrypt( mbedtls_svc_key_id_t key,
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{
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status = mbedtls_to_psa_error(
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mbedtls_rsa_pkcs1_encrypt( rsa,
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mbedtls_ctr_drbg_random,
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&global_data.ctr_drbg,
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mbedtls_psa_get_random,
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mbedtls_psa_random_state( &global_data.rng ),
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MBEDTLS_RSA_PUBLIC,
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input_length,
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input,
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@ -4152,8 +4148,8 @@ psa_status_t psa_asymmetric_encrypt( mbedtls_svc_key_id_t key,
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psa_rsa_oaep_set_padding_mode( alg, rsa );
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status = mbedtls_to_psa_error(
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mbedtls_rsa_rsaes_oaep_encrypt( rsa,
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mbedtls_ctr_drbg_random,
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&global_data.ctr_drbg,
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mbedtls_psa_get_random,
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mbedtls_psa_random_state( &global_data.rng ),
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MBEDTLS_RSA_PUBLIC,
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salt, salt_length,
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input_length,
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@ -4244,8 +4240,8 @@ psa_status_t psa_asymmetric_decrypt( mbedtls_svc_key_id_t key,
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{
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status = mbedtls_to_psa_error(
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mbedtls_rsa_pkcs1_decrypt( rsa,
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mbedtls_ctr_drbg_random,
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&global_data.ctr_drbg,
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mbedtls_psa_get_random,
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mbedtls_psa_random_state( &global_data.rng ),
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MBEDTLS_RSA_PRIVATE,
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output_length,
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input,
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@ -4260,8 +4256,8 @@ psa_status_t psa_asymmetric_decrypt( mbedtls_svc_key_id_t key,
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psa_rsa_oaep_set_padding_mode( alg, rsa );
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status = mbedtls_to_psa_error(
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mbedtls_rsa_rsaes_oaep_decrypt( rsa,
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mbedtls_ctr_drbg_random,
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&global_data.ctr_drbg,
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mbedtls_psa_get_random,
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mbedtls_psa_random_state( &global_data.rng ),
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MBEDTLS_RSA_PRIVATE,
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salt, salt_length,
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output_length,
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@ -4495,8 +4491,8 @@ psa_status_t psa_cipher_generate_iv( psa_cipher_operation_t *operation,
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status = PSA_ERROR_BUFFER_TOO_SMALL;
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goto exit;
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}
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ret = mbedtls_ctr_drbg_random( &global_data.ctr_drbg,
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iv, operation->iv_size );
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ret = mbedtls_psa_get_random( mbedtls_psa_random_state( &global_data.rng ),
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iv, operation->iv_size );
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if( ret != 0 )
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{
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status = mbedtls_to_psa_error( ret );
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@ -6111,8 +6107,8 @@ static psa_status_t psa_key_agreement_ecdh( const uint8_t *peer_key,
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mbedtls_ecdh_calc_secret( &ecdh,
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shared_secret_length,
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shared_secret, shared_secret_size,
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mbedtls_ctr_drbg_random,
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&global_data.ctr_drbg ) );
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mbedtls_psa_get_random,
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mbedtls_psa_random_state( &global_data.rng ) ) );
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if( status != PSA_SUCCESS )
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goto exit;
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if( PSA_BITS_TO_BYTES( bits ) != *shared_secret_length )
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@ -6290,28 +6286,72 @@ exit:
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}
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/****************************************************************/
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/* Random generation */
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/****************************************************************/
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/** Initialize the PSA random generator.
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*/
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static void mbedtls_psa_random_init( mbedtls_psa_random_context_t *rng )
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{
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/* Set default configuration if
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* mbedtls_psa_crypto_configure_entropy_sources() hasn't been called. */
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if( rng->entropy_init == NULL )
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rng->entropy_init = mbedtls_entropy_init;
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if( rng->entropy_free == NULL )
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rng->entropy_free = mbedtls_entropy_free;
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rng->entropy_init( &rng->entropy );
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#if defined(MBEDTLS_PSA_INJECT_ENTROPY) && \
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defined(MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES)
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/* The PSA entropy injection feature depends on using NV seed as an entropy
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* source. Add NV seed as an entropy source for PSA entropy injection. */
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mbedtls_entropy_add_source( &rng->entropy,
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mbedtls_nv_seed_poll, NULL,
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MBEDTLS_ENTROPY_BLOCK_SIZE,
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MBEDTLS_ENTROPY_SOURCE_STRONG );
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#endif
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mbedtls_psa_drbg_init( mbedtls_psa_random_state( rng ) );
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}
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/** Deinitialize the PSA random generator.
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*/
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static void mbedtls_psa_random_free( mbedtls_psa_random_context_t *rng )
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{
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mbedtls_psa_drbg_free( mbedtls_psa_random_state( rng ) );
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rng->entropy_free( &rng->entropy );
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}
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/** Seed the PSA random generator.
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*/
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static psa_status_t mbedtls_psa_random_seed( mbedtls_psa_random_context_t *rng )
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{
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const unsigned char drbg_seed[] = "PSA";
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int ret = mbedtls_psa_drbg_seed( rng, drbg_seed, sizeof( drbg_seed ) - 1 );
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return mbedtls_to_psa_error( ret );
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}
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psa_status_t psa_generate_random( uint8_t *output,
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size_t output_size )
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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GUARD_MODULE_INITIALIZED;
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while( output_size > MBEDTLS_CTR_DRBG_MAX_REQUEST )
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while( output_size > MBEDTLS_PSA_RANDOM_MAX_REQUEST )
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{
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ret = mbedtls_ctr_drbg_random( &global_data.ctr_drbg,
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output,
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MBEDTLS_CTR_DRBG_MAX_REQUEST );
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ret = mbedtls_psa_get_random(
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mbedtls_psa_random_state( &global_data.rng ),
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output, MBEDTLS_PSA_RANDOM_MAX_REQUEST );
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if( ret != 0 )
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return( mbedtls_to_psa_error( ret ) );
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output += MBEDTLS_CTR_DRBG_MAX_REQUEST;
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output_size -= MBEDTLS_CTR_DRBG_MAX_REQUEST;
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output += MBEDTLS_PSA_RANDOM_MAX_REQUEST;
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output_size -= MBEDTLS_PSA_RANDOM_MAX_REQUEST;
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}
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ret = mbedtls_ctr_drbg_random( &global_data.ctr_drbg, output, output_size );
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ret = mbedtls_psa_get_random( mbedtls_psa_random_state( &global_data.rng ),
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output, output_size );
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return( mbedtls_to_psa_error( ret ) );
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}
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@ -6417,8 +6457,8 @@ static psa_status_t psa_generate_key_internal(
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return( status );
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mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE );
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ret = mbedtls_rsa_gen_key( &rsa,
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mbedtls_ctr_drbg_random,
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&global_data.ctr_drbg,
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mbedtls_psa_get_random,
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mbedtls_psa_random_state( &global_data.rng ),
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(unsigned int) bits,
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exponent );
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if( ret != 0 )
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@ -6463,8 +6503,8 @@ static psa_status_t psa_generate_key_internal(
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return( PSA_ERROR_NOT_SUPPORTED );
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mbedtls_ecp_keypair_init( &ecp );
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ret = mbedtls_ecp_gen_key( grp_id, &ecp,
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mbedtls_ctr_drbg_random,
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&global_data.ctr_drbg );
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mbedtls_psa_get_random,
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mbedtls_psa_random_state( &global_data.rng ) );
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if( ret != 0 )
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{
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mbedtls_ecp_keypair_free( &ecp );
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@ -6550,8 +6590,8 @@ psa_status_t mbedtls_psa_crypto_configure_entropy_sources(
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{
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if( global_data.rng_state != RNG_NOT_INITIALIZED )
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return( PSA_ERROR_BAD_STATE );
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global_data.entropy_init = entropy_init;
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global_data.entropy_free = entropy_free;
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global_data.rng.entropy_init = entropy_init;
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global_data.rng.entropy_free = entropy_free;
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return( PSA_SUCCESS );
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}
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@ -6560,8 +6600,7 @@ void mbedtls_psa_crypto_free( void )
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psa_wipe_all_key_slots( );
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if( global_data.rng_state != RNG_NOT_INITIALIZED )
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{
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mbedtls_ctr_drbg_free( &global_data.ctr_drbg );
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global_data.entropy_free( &global_data.entropy );
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mbedtls_psa_random_free( &global_data.rng );
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}
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/* Wipe all remaining data, including configuration.
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* In particular, this sets all state indicator to the value
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@ -6603,37 +6642,15 @@ static psa_status_t psa_crypto_recover_transaction(
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psa_status_t psa_crypto_init( void )
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{
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psa_status_t status;
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const unsigned char drbg_seed[] = "PSA";
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/* Double initialization is explicitly allowed. */
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if( global_data.initialized != 0 )
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return( PSA_SUCCESS );
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/* Set default configuration if
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* mbedtls_psa_crypto_configure_entropy_sources() hasn't been called. */
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if( global_data.entropy_init == NULL )
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global_data.entropy_init = mbedtls_entropy_init;
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if( global_data.entropy_free == NULL )
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global_data.entropy_free = mbedtls_entropy_free;
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/* Initialize the random generator. */
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global_data.entropy_init( &global_data.entropy );
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#if defined(MBEDTLS_PSA_INJECT_ENTROPY) && \
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defined(MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES)
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/* The PSA entropy injection feature depends on using NV seed as an entropy
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* source. Add NV seed as an entropy source for PSA entropy injection. */
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mbedtls_entropy_add_source( &global_data.entropy,
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mbedtls_nv_seed_poll, NULL,
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MBEDTLS_ENTROPY_BLOCK_SIZE,
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MBEDTLS_ENTROPY_SOURCE_STRONG );
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#endif
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mbedtls_ctr_drbg_init( &global_data.ctr_drbg );
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/* Initialize and seed the random generator. */
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mbedtls_psa_random_init( &global_data.rng );
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global_data.rng_state = RNG_INITIALIZED;
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status = mbedtls_to_psa_error(
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mbedtls_ctr_drbg_seed( &global_data.ctr_drbg,
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mbedtls_entropy_func,
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&global_data.entropy,
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drbg_seed, sizeof( drbg_seed ) - 1 ) );
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status = mbedtls_psa_random_seed( &global_data.rng );
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if( status != PSA_SUCCESS )
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goto exit;
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global_data.rng_state = RNG_SEEDED;
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@ -22,5 +22,109 @@
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#ifndef PSA_CRYPTO_RANDOM_H
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#define PSA_CRYPTO_RANDOM_H
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/* Currently, the only supported RNG is Mbed TLS's CTR_DRBG seeded with
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* mbedtls_entropy_func(). */
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/entropy.h"
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/** The type of the PSA DRBG context.
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*/
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typedef mbedtls_ctr_drbg_context mbedtls_psa_drbg_context_t;
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/** Initialize the PSA DRBG.
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*
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* \param p_rng Pointer to the Mbed TLS DRBG state.
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*/
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static inline void mbedtls_psa_drbg_init( mbedtls_psa_drbg_context_t *p_rng )
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{
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mbedtls_ctr_drbg_init( p_rng );
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}
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|
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/** Deinitialize the PSA DRBG.
|
||||
*
|
||||
* \param p_rng Pointer to the Mbed TLS DRBG state.
|
||||
*/
|
||||
static inline void mbedtls_psa_drbg_free( mbedtls_psa_drbg_context_t *p_rng )
|
||||
{
|
||||
mbedtls_ctr_drbg_free( p_rng );
|
||||
}
|
||||
|
||||
/** The type of the PSA random generator context.
|
||||
*
|
||||
* The random generator context is composed of an entropy context and
|
||||
* a DRBG context.
|
||||
*/
|
||||
typedef struct
|
||||
{
|
||||
void (* entropy_init )( mbedtls_entropy_context *ctx );
|
||||
void (* entropy_free )( mbedtls_entropy_context *ctx );
|
||||
mbedtls_entropy_context entropy;
|
||||
mbedtls_psa_drbg_context_t drbg;
|
||||
} mbedtls_psa_random_context_t;
|
||||
|
||||
/** Return random data.
|
||||
*
|
||||
* This function is suitable as the \p f_rng parameter to Mbed TLS functions
|
||||
* that require a random generator. Use mbedtls_psa_random_state() to
|
||||
* obtain the \p p_rng parameter.
|
||||
*
|
||||
* \param p_rng The CTR_DRBG context. This must be
|
||||
* mbedtls_psa_random_state( \c rng )
|
||||
* where \c rng is a pointer to a
|
||||
* ::mbedtls_psa_random_context_t structure.
|
||||
* \param output The buffer to fill.
|
||||
* \param output_len The length of the buffer in bytes.
|
||||
* It must be at most #MBEDTLS_PSA_RANDOM_MAX_REQUEST.
|
||||
*
|
||||
* \return \c 0 on success.
|
||||
* \return #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED or
|
||||
* #MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG on failure.
|
||||
*/
|
||||
static inline int mbedtls_psa_get_random( void *p_rng,
|
||||
unsigned char *output,
|
||||
size_t output_len )
|
||||
{
|
||||
return( mbedtls_ctr_drbg_random( p_rng, output, output_len ) );
|
||||
}
|
||||
|
||||
/** The maximum number of bytes that mbedtls_psa_get_random() is expected to
|
||||
* return.
|
||||
*/
|
||||
#define MBEDTLS_PSA_RANDOM_MAX_REQUEST MBEDTLS_CTR_DRBG_MAX_REQUEST
|
||||
|
||||
/** Retrieve the DRBG state from the PSA RNG state.
|
||||
*
|
||||
* \param rng Pointer to the PSA random generator state.
|
||||
*
|
||||
* \return The DRBG state (\c p_rng argument ).
|
||||
*/
|
||||
static inline mbedtls_psa_drbg_context_t *mbedtls_psa_random_state(
|
||||
mbedtls_psa_random_context_t *rng )
|
||||
{
|
||||
return( &rng->drbg );
|
||||
}
|
||||
|
||||
|
||||
/** Seed the PSA DRBG.
|
||||
*
|
||||
* \param rng DRBG context to be seeded.
|
||||
* \param custom The personalization string.
|
||||
* This can be \c NULL, in which case the personalization
|
||||
* string is empty regardless of the value of \p len.
|
||||
* \param len The length of the personalization string.
|
||||
*
|
||||
* \return \c 0 on success.
|
||||
* \return An Mbed TLS error code (\c MBEDTLS_ERR_xxx) on failure.
|
||||
*/
|
||||
static inline int mbedtls_psa_drbg_seed(
|
||||
mbedtls_psa_random_context_t *rng,
|
||||
const unsigned char *custom, size_t len )
|
||||
{
|
||||
return( mbedtls_ctr_drbg_seed( mbedtls_psa_random_state( rng ),
|
||||
mbedtls_entropy_func,
|
||||
&rng->entropy,
|
||||
custom, len ) );
|
||||
}
|
||||
|
||||
#endif /* PSA_CRYPTO_RANDOM_H */
|
||||
|
|
|
|||
Loading…
Reference in a new issue