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tls13: Share write ecdh_key_exchange function

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Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
This commit is contained in:
Jerry Yu 2022-03-30 22:43:29 +08:00
parent 3bf2c6449d
commit 89e103c54c
4 changed files with 83 additions and 68 deletions
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57
library/ssl_tls13_generic.c
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@ -1535,6 +1535,63 @@ int mbedtls_ssl_tls13_read_public_ecdhe_share( mbedtls_ssl_context *ssl,
return( 0 );
}
int mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange(
mbedtls_ssl_context *ssl,
uint16_t named_group,
unsigned char *buf,
unsigned char *end,
size_t *out_len )
{
psa_status_t status = PSA_ERROR_GENERIC_ERROR;
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
psa_key_attributes_t key_attributes;
size_t own_pubkey_len;
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
size_t ecdh_bits = 0;
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Perform PSA-based ECDH computation." ) );
/* Convert EC group to PSA key type. */
if( ( handshake->ecdh_psa_type =
mbedtls_psa_parse_tls_ecc_group( named_group, &ecdh_bits ) ) == 0 )
return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
ssl->handshake->ecdh_bits = ecdh_bits;
key_attributes = psa_key_attributes_init();
psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_DERIVE );
psa_set_key_algorithm( &key_attributes, PSA_ALG_ECDH );
psa_set_key_type( &key_attributes, handshake->ecdh_psa_type );
psa_set_key_bits( &key_attributes, handshake->ecdh_bits );
/* Generate ECDH private key. */
status = psa_generate_key( &key_attributes,
&handshake->ecdh_psa_privkey );
if( status != PSA_SUCCESS )
{
ret = psa_ssl_status_to_mbedtls( status );
MBEDTLS_SSL_DEBUG_RET( 1, "psa_generate_key", ret );
return( ret );
}
/* Export the public part of the ECDH private key from PSA. */
status = psa_export_public_key( handshake->ecdh_psa_privkey,
buf, (size_t)( end - buf ),
&own_pubkey_len );
if( status != PSA_SUCCESS )
{
ret = psa_ssl_status_to_mbedtls( status );
MBEDTLS_SSL_DEBUG_RET( 1, "psa_export_public_key", ret );
return( ret );
}
*out_len = own_pubkey_len;
return( 0 );
}
#endif /* MBEDTLS_ECDH_C */
#endif /* MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_PROTO_TLS1_3 */