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Combine mbedtls_ssl_tls13_generate_and_write_ecdh/ffdh_key_exchange functions

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Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
This commit is contained in:
Przemek Stekiel
2023-05-31 15:21:04 +02:00
parent 316c19ef93
commit 29c219c285
4 changed files with 84 additions and 139 deletions
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169
library/ssl_tls13_generic.c
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@ -1513,7 +1513,36 @@ int mbedtls_ssl_tls13_read_public_ecdhe_share(mbedtls_ssl_context *ssl,
return 0;
}
int mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange(
static psa_key_type_t mbedtls_psa_parse_tls_ffdh_group(
uint16_t tls_ecc_grp_reg_id, size_t *bits, psa_key_type_t *key_type)
{
switch (tls_ecc_grp_reg_id) {
case MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE2048:
*bits = 2048;
*key_type = PSA_KEY_TYPE_DH_KEY_PAIR(PSA_DH_FAMILY_RFC7919);
return PSA_SUCCESS;
case MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE3072:
*bits = 3072;
*key_type = PSA_KEY_TYPE_DH_KEY_PAIR(PSA_DH_FAMILY_RFC7919);
return PSA_SUCCESS;
case MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE4096:
*bits = 4096;
*key_type = PSA_KEY_TYPE_DH_KEY_PAIR(PSA_DH_FAMILY_RFC7919);
return PSA_SUCCESS;
case MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE6144:
*bits = 6144;
*key_type = PSA_KEY_TYPE_DH_KEY_PAIR(PSA_DH_FAMILY_RFC7919);
return PSA_SUCCESS;
case MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE8192:
*bits = 8192;
*key_type = PSA_KEY_TYPE_DH_KEY_PAIR(PSA_DH_FAMILY_RFC7919);
return PSA_SUCCESS;
default:
return PSA_ERROR_NOT_SUPPORTED;
}
}
int mbedtls_ssl_tls13_generate_and_write_dh_key_exchange(
mbedtls_ssl_context *ssl,
uint16_t named_group,
unsigned char *buf,
@ -1525,26 +1554,57 @@ int mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange(
psa_key_attributes_t key_attributes;
size_t own_pubkey_len;
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
psa_ecc_family_t ec_psa_family = 0;
size_t ec_bits = 0;
size_t bits = 0;
psa_key_type_t key_type = 0;
size_t buf_size = (size_t) (end - buf);
MBEDTLS_SSL_DEBUG_MSG(1, ("Perform PSA-based ECDH computation."));
MBEDTLS_SSL_DEBUG_MSG(1, ("Perform PSA-based ECDH/FFDH computation."));
/* Convert EC's TLS ID to PSA key type. */
#if defined(PSA_WANT_ALG_ECDH)
psa_ecc_family_t ec_psa_family = 0;
if (mbedtls_ssl_get_psa_curve_info_from_tls_id(
named_group, &ec_psa_family, &ec_bits) == PSA_ERROR_NOT_SUPPORTED) {
named_group, &ec_psa_family, &bits) == PSA_SUCCESS) {
key_type = PSA_KEY_TYPE_ECC_KEY_PAIR(ec_psa_family);
}
#endif
#if defined(PSA_WANT_ALG_FFDH)
if (mbedtls_psa_parse_tls_ffdh_group(named_group, &bits, &key_type) == PSA_SUCCESS) {
if (PSA_KEY_TYPE_IS_DH(key_type)) {
if (buf_size < PSA_BITS_TO_BYTES(bits)) {
return MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL;
}
buf_size = PSA_BITS_TO_BYTES(bits);
}
}
#endif
if (key_type == 0) {
return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE;
}
handshake->ecdh_psa_type = PSA_KEY_TYPE_ECC_KEY_PAIR(ec_psa_family);
ssl->handshake->ecdh_bits = ec_bits;
handshake->ecdh_psa_type = key_type;
ssl->handshake->ecdh_bits = 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);
if (PSA_KEY_TYPE_IS_ECC(key_type)) {
#if defined(PSA_WANT_ALG_ECDH)
psa_set_key_algorithm(&key_attributes, PSA_ALG_ECDH);
#endif
} else {
#if defined(PSA_WANT_ALG_FFDH)
psa_set_key_algorithm(&key_attributes, PSA_ALG_FFDH);
#endif
}
psa_set_key_type(&key_attributes, handshake->ecdh_psa_type);
psa_set_key_bits(&key_attributes, handshake->ecdh_bits);
/* Generate ECDH private key. */
/* Generate ECDH/FFDH private key. */
status = psa_generate_key(&key_attributes,
&handshake->ecdh_psa_privkey);
if (status != PSA_SUCCESS) {
@ -1554,10 +1614,11 @@ int mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange(
}
/* Export the public part of the ECDH private key from PSA. */
/* Export the public part of the ECDH/FFDH private key from PSA. */
status = psa_export_public_key(handshake->ecdh_psa_privkey,
buf, (size_t) (end - buf),
buf, buf_size,
&own_pubkey_len);
if (status != PSA_SUCCESS) {
ret = PSA_TO_MBEDTLS_ERR(status);
MBEDTLS_SSL_DEBUG_RET(1, "psa_export_public_key", ret);
@ -1571,92 +1632,6 @@ int mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange(
}
#endif /* PSA_WANT_ALG_ECDH || PSA_WANT_ALG_FFDH */
#if defined(PSA_WANT_ALG_FFDH)
static psa_key_type_t mbedtls_psa_parse_tls_ffdh_group(
uint16_t tls_ecc_grp_reg_id, size_t *bits)
{
switch (tls_ecc_grp_reg_id) {
case MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE2048:
*bits = 2048;
return PSA_KEY_TYPE_DH_KEY_PAIR(PSA_DH_FAMILY_RFC7919);
case MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE3072:
*bits = 3072;
return PSA_KEY_TYPE_DH_KEY_PAIR(PSA_DH_FAMILY_RFC7919);
case MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE4096:
*bits = 4096;
return PSA_KEY_TYPE_DH_KEY_PAIR(PSA_DH_FAMILY_RFC7919);
case MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE6144:
*bits = 6144;
return PSA_KEY_TYPE_DH_KEY_PAIR(PSA_DH_FAMILY_RFC7919);
case MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE8192:
*bits = 8192;
return PSA_KEY_TYPE_DH_KEY_PAIR(PSA_DH_FAMILY_RFC7919);
default:
return 0;
}
}
int mbedtls_ssl_tls13_generate_and_write_dhe_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 ffdh_bits = 0;
MBEDTLS_SSL_DEBUG_MSG(1, ("Perform PSA-based DHE computation."));
/* Convert DHE group to PSA key type. */
if ((handshake->ecdh_psa_type =
mbedtls_psa_parse_tls_ffdh_group(named_group, &ffdh_bits)) == 0) {
return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE;
}
if ((size_t) (end - buf) < PSA_BITS_TO_BYTES(ffdh_bits)) {
ret = MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL;
return ret;
}
ssl->handshake->ecdh_bits = ffdh_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_FFDH);
psa_set_key_type(&key_attributes, handshake->ecdh_psa_type);
psa_set_key_bits(&key_attributes, handshake->ecdh_bits);
/* Generate FFDH private key. */
status = psa_generate_key(&key_attributes,
&handshake->ecdh_psa_privkey);
if (status != PSA_SUCCESS) {
ret = PSA_TO_MBEDTLS_ERR(status);
MBEDTLS_SSL_DEBUG_RET(1, "psa_generate_key", ret);
return ret;
}
/* Export the public part of the FFDH private key from PSA. */
status = psa_export_public_key(handshake->ecdh_psa_privkey,
buf, PSA_BITS_TO_BYTES(ffdh_bits),
&own_pubkey_len);
if (status != PSA_SUCCESS) {
ret = PSA_TO_MBEDTLS_ERR(status);
MBEDTLS_SSL_DEBUG_RET(1, "psa_export_public_key", ret);
return ret;
}
*out_len = own_pubkey_len;
return 0;
}
#endif /* PSA_WANT_ALG_FFDH */
/* RFC 8446 section 4.2
*
* If an implementation receives an extension which it recognizes and which is