diff options
Diffstat (limited to 'library/pkparse.c')
| -rw-r--r-- | library/pkparse.c | 314 |
1 files changed, 9 insertions, 305 deletions
diff --git a/library/pkparse.c b/library/pkparse.c index 5a3d3b2..4f6ee13 100644 --- a/library/pkparse.c +++ b/library/pkparse.c @@ -46,302 +46,6 @@ /*********************************************************************** * - * ECC setters - * - * 1. This is an abstraction layer around MBEDTLS_PK_USE_PSA_EC_DATA: - * this macro will not appear outside this section. - * 2. All inputs are raw: no metadata, no ASN.1 until the next section. - * - **********************************************************************/ - -/* - * Set the group used by this key. - * - * [in/out] pk: in: must have been pk_setup() to an ECC type - * out: will have group (curve) information set - * [in] grp_in: a supported group ID (not NONE) - */ -static int pk_ecc_set_group(mbedtls_pk_context *pk, mbedtls_ecp_group_id grp_id) -{ -#if defined(MBEDTLS_PK_USE_PSA_EC_DATA) - size_t ec_bits; - psa_ecc_family_t ec_family = mbedtls_ecc_group_to_psa(grp_id, &ec_bits); - - /* group may already be initialized; if so, make sure IDs match */ - if ((pk->ec_family != 0 && pk->ec_family != ec_family) || - (pk->ec_bits != 0 && pk->ec_bits != ec_bits)) { - return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT; - } - - /* set group */ - pk->ec_family = ec_family; - pk->ec_bits = ec_bits; - - return 0; -#else /* MBEDTLS_PK_USE_PSA_EC_DATA */ - mbedtls_ecp_keypair *ecp = mbedtls_pk_ec_rw(*pk); - - /* grp may already be initialized; if so, make sure IDs match */ - if (mbedtls_pk_ec_ro(*pk)->grp.id != MBEDTLS_ECP_DP_NONE && - mbedtls_pk_ec_ro(*pk)->grp.id != grp_id) { - return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT; - } - - /* set group */ - return mbedtls_ecp_group_load(&(ecp->grp), grp_id); -#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */ -} - -/* - * Set the private key material - * - * [in/out] pk: in: must have the group set already, see pk_ecc_set_group(). - * out: will have the private key set. - * [in] key, key_len: the raw private key (no ASN.1 wrapping). - */ -static int pk_ecc_set_key(mbedtls_pk_context *pk, - unsigned char *key, size_t key_len) -{ -#if defined(MBEDTLS_PK_USE_PSA_EC_DATA) - psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; - psa_key_usage_t flags; - psa_status_t status; - - psa_set_key_type(&attributes, PSA_KEY_TYPE_ECC_KEY_PAIR(pk->ec_family)); - if (pk->ec_family == PSA_ECC_FAMILY_MONTGOMERY) { - /* Do not set algorithm here because Montgomery keys cannot do ECDSA and - * the PK module cannot do ECDH. When the key will be used in TLS for - * ECDH, it will be exported and then re-imported with proper flags - * and algorithm. */ - flags = PSA_KEY_USAGE_EXPORT; - } else { - psa_set_key_algorithm(&attributes, - MBEDTLS_PK_PSA_ALG_ECDSA_MAYBE_DET(PSA_ALG_ANY_HASH)); - flags = PSA_KEY_USAGE_SIGN_HASH | PSA_KEY_USAGE_SIGN_MESSAGE | - PSA_KEY_USAGE_EXPORT; - } - psa_set_key_usage_flags(&attributes, flags); - - status = psa_import_key(&attributes, key, key_len, &pk->priv_id); - return psa_pk_status_to_mbedtls(status); - -#else /* MBEDTLS_PK_USE_PSA_EC_DATA */ - - mbedtls_ecp_keypair *eck = mbedtls_pk_ec_rw(*pk); - int ret = mbedtls_ecp_read_key(eck->grp.id, eck, key, key_len); - if (ret != 0) { - return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret); - } - return 0; -#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */ -} - -/* - * Derive a public key from its private counterpart. - * Computationally intensive, only use when public key is not available. - * - * [in/out] pk: in: must have the private key set, see pk_ecc_set_key(). - * out: will have the public key set. - * [in] prv, prv_len: the raw private key (see note below). - * [in] f_rng, p_rng: RNG function and context. - * - * Note: the private key information is always available from pk, - * however for convenience the serialized version is also passed, - * as it's available at each calling site, and useful in some configs - * (as otherwise we would have to re-serialize it from the pk context). - * - * There are three implementations of this function: - * 1. MBEDTLS_PK_USE_PSA_EC_DATA, - * 2. MBEDTLS_USE_PSA_CRYPTO but not MBEDTLS_PK_USE_PSA_EC_DATA, - * 3. not MBEDTLS_USE_PSA_CRYPTO. - */ -static int pk_ecc_set_pubkey_from_prv(mbedtls_pk_context *pk, - const unsigned char *prv, size_t prv_len, - int (*f_rng)(void *, unsigned char *, size_t), void *p_rng) -{ -#if defined(MBEDTLS_PK_USE_PSA_EC_DATA) - - (void) f_rng; - (void) p_rng; - (void) prv; - (void) prv_len; - psa_status_t status; - - status = psa_export_public_key(pk->priv_id, pk->pub_raw, sizeof(pk->pub_raw), - &pk->pub_raw_len); - return psa_pk_status_to_mbedtls(status); - -#elif defined(MBEDTLS_USE_PSA_CRYPTO) /* && !MBEDTLS_PK_USE_PSA_EC_DATA */ - - (void) f_rng; - (void) p_rng; - psa_status_t status; - - mbedtls_ecp_keypair *eck = (mbedtls_ecp_keypair *) pk->pk_ctx; - size_t curve_bits; - psa_ecc_family_t curve = mbedtls_ecc_group_to_psa(eck->grp.id, &curve_bits); - - /* Import private key into PSA, from serialized input */ - mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT; - psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT; - psa_set_key_type(&key_attr, PSA_KEY_TYPE_ECC_KEY_PAIR(curve)); - psa_set_key_usage_flags(&key_attr, PSA_KEY_USAGE_EXPORT); - status = psa_import_key(&key_attr, prv, prv_len, &key_id); - if (status != PSA_SUCCESS) { - return psa_pk_status_to_mbedtls(status); - } - - /* Export public key from PSA */ - unsigned char pub[MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH]; - size_t pub_len; - status = psa_export_public_key(key_id, pub, sizeof(pub), &pub_len); - psa_status_t destruction_status = psa_destroy_key(key_id); - if (status != PSA_SUCCESS) { - return psa_pk_status_to_mbedtls(status); - } else if (destruction_status != PSA_SUCCESS) { - return psa_pk_status_to_mbedtls(destruction_status); - } - - /* Load serialized public key into ecp_keypair structure */ - return mbedtls_ecp_point_read_binary(&eck->grp, &eck->Q, pub, pub_len); - -#else /* MBEDTLS_USE_PSA_CRYPTO */ - - (void) prv; - (void) prv_len; - - mbedtls_ecp_keypair *eck = (mbedtls_ecp_keypair *) pk->pk_ctx; - return mbedtls_ecp_mul(&eck->grp, &eck->Q, &eck->d, &eck->grp.G, f_rng, p_rng); - -#endif /* MBEDTLS_USE_PSA_CRYPTO */ -} - -#if defined(MBEDTLS_PK_USE_PSA_EC_DATA) -/* - * Set the public key: fallback using ECP_LIGHT in the USE_PSA_EC_DATA case. - * - * Normally, when MBEDTLS_PK_USE_PSA_EC_DATA is enabled, we only use PSA - * functions to handle keys. However, currently psa_import_key() does not - * support compressed points. In case that support was explicitly requested, - * this fallback uses ECP functions to get the job done. This is the reason - * why MBEDTLS_PK_PARSE_EC_COMPRESSED auto-enables MBEDTLS_ECP_LIGHT. - * - * [in/out] pk: in: must have the group set, see pk_ecc_set_group(). - * out: will have the public key set. - * [in] pub, pub_len: the public key as an ECPoint, - * in any format supported by ECP. - * - * Return: - * - 0 on success; - * - MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE if the format is potentially valid - * but not supported; - * - another error code otherwise. - */ -static int pk_ecc_set_pubkey_psa_ecp_fallback(mbedtls_pk_context *pk, - const unsigned char *pub, - size_t pub_len) -{ -#if !defined(MBEDTLS_PK_PARSE_EC_COMPRESSED) - (void) pk; - (void) pub; - (void) pub_len; - return MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE; -#else /* MBEDTLS_PK_PARSE_EC_COMPRESSED */ - mbedtls_ecp_keypair ecp_key; - mbedtls_ecp_group_id ecp_group_id; - int ret; - - ecp_group_id = mbedtls_ecc_group_from_psa(pk->ec_family, pk->ec_bits); - - mbedtls_ecp_keypair_init(&ecp_key); - ret = mbedtls_ecp_group_load(&(ecp_key.grp), ecp_group_id); - if (ret != 0) { - goto exit; - } - ret = mbedtls_ecp_point_read_binary(&(ecp_key.grp), &ecp_key.Q, - pub, pub_len); - if (ret != 0) { - goto exit; - } - ret = mbedtls_ecp_point_write_binary(&(ecp_key.grp), &ecp_key.Q, - MBEDTLS_ECP_PF_UNCOMPRESSED, - &pk->pub_raw_len, pk->pub_raw, - sizeof(pk->pub_raw)); - -exit: - mbedtls_ecp_keypair_free(&ecp_key); - return ret; -#endif /* MBEDTLS_PK_PARSE_EC_COMPRESSED */ -} -#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */ - -/* - * Set the public key. - * - * [in/out] pk: in: must have its group set, see pk_ecc_set_group(). - * out: will have the public key set. - * [in] pub, pub_len: the raw public key (an ECPoint). - * - * Return: - * - 0 on success; - * - MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE if the format is potentially valid - * but not supported; - * - another error code otherwise. - */ -static int pk_ecc_set_pubkey(mbedtls_pk_context *pk, - const unsigned char *pub, size_t pub_len) -{ -#if defined(MBEDTLS_PK_USE_PSA_EC_DATA) - - /* Load the key */ - if (!PSA_ECC_FAMILY_IS_WEIERSTRASS(pk->ec_family) || *pub == 0x04) { - /* Format directly supported by PSA: - * - non-Weierstrass curves that only have one format; - * - uncompressed format for Weierstrass curves. */ - if (pub_len > sizeof(pk->pub_raw)) { - return MBEDTLS_ERR_PK_BUFFER_TOO_SMALL; - } - memcpy(pk->pub_raw, pub, pub_len); - pk->pub_raw_len = pub_len; - } else { - /* Other format, try the fallback */ - int ret = pk_ecc_set_pubkey_psa_ecp_fallback(pk, pub, pub_len); - if (ret != 0) { - return ret; - } - } - - /* Validate the key by trying to import it */ - mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT; - psa_key_attributes_t key_attrs = PSA_KEY_ATTRIBUTES_INIT; - - psa_set_key_usage_flags(&key_attrs, 0); - psa_set_key_type(&key_attrs, PSA_KEY_TYPE_ECC_PUBLIC_KEY(pk->ec_family)); - psa_set_key_bits(&key_attrs, pk->ec_bits); - - if ((psa_import_key(&key_attrs, pk->pub_raw, pk->pub_raw_len, - &key_id) != PSA_SUCCESS) || - (psa_destroy_key(key_id) != PSA_SUCCESS)) { - return MBEDTLS_ERR_PK_INVALID_PUBKEY; - } - - return 0; - -#else /* MBEDTLS_PK_USE_PSA_EC_DATA */ - - int ret; - mbedtls_ecp_keypair *ec_key = (mbedtls_ecp_keypair *) pk->pk_ctx; - ret = mbedtls_ecp_point_read_binary(&ec_key->grp, &ec_key->Q, pub, pub_len); - if (ret != 0) { - return ret; - } - return mbedtls_ecp_check_pubkey(&ec_key->grp, &ec_key->Q); - -#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */ -} - -/*********************************************************************** - * * Low-level ECC parsing: optional support for SpecifiedECDomain * * There are two functions here that are used by the rest of the code: @@ -698,7 +402,7 @@ static int pk_use_ecparams(const mbedtls_asn1_buf *params, mbedtls_pk_context *p } } - return pk_ecc_set_group(pk, grp_id); + return mbedtls_pk_ecc_set_group(pk, grp_id); } #if defined(MBEDTLS_PK_HAVE_RFC8410_CURVES) @@ -714,7 +418,7 @@ static int pk_use_ecparams_rfc8410(const mbedtls_asn1_buf *params, return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT; } - return pk_ecc_set_group(pk, grp_id); + return mbedtls_pk_ecc_set_group(pk, grp_id); } /* @@ -740,7 +444,7 @@ static int pk_parse_key_rfc8410_der(mbedtls_pk_context *pk, /* * Load the private key */ - ret = pk_ecc_set_key(pk, key, len); + ret = mbedtls_pk_ecc_set_key(pk, key, len); if (ret != 0) { return ret; } @@ -748,7 +452,7 @@ static int pk_parse_key_rfc8410_der(mbedtls_pk_context *pk, /* pk_parse_key_pkcs8_unencrypted_der() only supports version 1 PKCS8 keys, * which never contain a public key. As such, derive the public key * unconditionally. */ - if ((ret = pk_ecc_set_pubkey_from_prv(pk, key, len, f_rng, p_rng)) != 0) { + if ((ret = mbedtls_pk_ecc_set_pubkey_from_prv(pk, key, len, f_rng, p_rng)) != 0) { return ret; } @@ -874,7 +578,7 @@ int mbedtls_pk_parse_subpubkey(unsigned char **p, const unsigned char *end, ret = pk_use_ecparams(&alg_params, pk); } if (ret == 0) { - ret = pk_ecc_set_pubkey(pk, *p, (size_t) (end - *p)); + ret = mbedtls_pk_ecc_set_pubkey(pk, *p, (size_t) (end - *p)); *p += end - *p; } } else @@ -966,7 +670,7 @@ static int pk_parse_key_sec1_der(mbedtls_pk_context *pk, /* * Load the private key */ - ret = pk_ecc_set_key(pk, d, d_len); + ret = mbedtls_pk_ecc_set_key(pk, d, d_len); if (ret != 0) { return ret; } @@ -990,11 +694,11 @@ static int pk_parse_key_sec1_der(mbedtls_pk_context *pk, MBEDTLS_ERR_ASN1_LENGTH_MISMATCH); } - if ((ret = pk_ecc_set_pubkey(pk, p, (size_t) (end2 - p))) == 0) { + if ((ret = mbedtls_pk_ecc_set_pubkey(pk, p, (size_t) (end2 - p))) == 0) { pubkey_done = 1; } else { /* - * The only acceptable failure mode of pk_ecc_set_pubkey() above + * The only acceptable failure mode of mbedtls_pk_ecc_set_pubkey() above * is if the point format is not recognized. */ if (ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE) { @@ -1007,7 +711,7 @@ static int pk_parse_key_sec1_der(mbedtls_pk_context *pk, } if (!pubkey_done) { - if ((ret = pk_ecc_set_pubkey_from_prv(pk, d, d_len, f_rng, p_rng)) != 0) { + if ((ret = mbedtls_pk_ecc_set_pubkey_from_prv(pk, d, d_len, f_rng, p_rng)) != 0) { return ret; } } |