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pkparse.c
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/*
* Public Key layer for parsing key files and structures
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "common.h"
#if defined(MBEDTLS_PK_PARSE_C)
#include "mbedtls/pk.h"
#include "mbedtls/asn1.h"
#include "mbedtls/oid.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
#include "pk_internal.h"
#include <string.h>
#if defined(MBEDTLS_RSA_C)
#include "mbedtls/rsa.h"
#endif
#include "mbedtls/ecp.h"
#if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECP_C)
#include "pkwrite.h"
#endif
#if defined(MBEDTLS_ECP_LIGHT)
#include "pk_internal.h"
#endif
#if defined(MBEDTLS_ECDSA_C)
#include "mbedtls/ecdsa.h"
#endif
#if defined(MBEDTLS_PEM_PARSE_C)
#include "mbedtls/pem.h"
#endif
#if defined(MBEDTLS_PKCS5_C)
#include "mbedtls/pkcs5.h"
#endif
#if defined(MBEDTLS_PKCS12_C)
#include "mbedtls/pkcs12.h"
#endif
#if defined(MBEDTLS_PSA_CRYPTO_C)
#include "mbedtls/psa_util.h"
#endif
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#include "psa/crypto.h"
#endif
#include "mbedtls/platform.h"
/* Helper for Montgomery curves */
#if defined(MBEDTLS_ECP_LIGHT) && defined(MBEDTLS_PK_HAVE_RFC8410_CURVES)
#define MBEDTLS_PK_IS_RFC8410_GROUP_ID(id) \
((id == MBEDTLS_ECP_DP_CURVE25519) || (id == MBEDTLS_ECP_DP_CURVE448))
#endif /* MBEDTLS_ECP_LIGHT && MBEDTLS_PK_HAVE_RFC8410_CURVES */
#if defined(MBEDTLS_FS_IO)
/*
* Load all data from a file into a given buffer.
*
* The file is expected to contain either PEM or DER encoded data.
* A terminating null byte is always appended. It is included in the announced
* length only if the data looks like it is PEM encoded.
*/
int mbedtls_pk_load_file(const char *path, unsigned char **buf, size_t *n)
{
FILE *f;
long size;
if ((f = fopen(path, "rb")) == NULL) {
return MBEDTLS_ERR_PK_FILE_IO_ERROR;
}
/* Ensure no stdio buffering of secrets, as such buffers cannot be wiped. */
mbedtls_setbuf(f, NULL);
fseek(f, 0, SEEK_END);
if ((size = ftell(f)) == -1) {
fclose(f);
return MBEDTLS_ERR_PK_FILE_IO_ERROR;
}
fseek(f, 0, SEEK_SET);
*n = (size_t) size;
if (*n + 1 == 0 ||
(*buf = mbedtls_calloc(1, *n + 1)) == NULL) {
fclose(f);
return MBEDTLS_ERR_PK_ALLOC_FAILED;
}
if (fread(*buf, 1, *n, f) != *n) {
fclose(f);
mbedtls_platform_zeroize(*buf, *n);
mbedtls_free(*buf);
return MBEDTLS_ERR_PK_FILE_IO_ERROR;
}
fclose(f);
(*buf)[*n] = '\0';
if (strstr((const char *) *buf, "-----BEGIN ") != NULL) {
++*n;
}
return 0;
}
/*
* Load and parse a private key
*/
int mbedtls_pk_parse_keyfile(mbedtls_pk_context *ctx,
const char *path, const char *pwd,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t n;
unsigned char *buf;
if ((ret = mbedtls_pk_load_file(path, &buf, &n)) != 0) {
return ret;
}
if (pwd == NULL) {
ret = mbedtls_pk_parse_key(ctx, buf, n, NULL, 0, f_rng, p_rng);
} else {
ret = mbedtls_pk_parse_key(ctx, buf, n,
(const unsigned char *) pwd, strlen(pwd), f_rng, p_rng);
}
mbedtls_platform_zeroize(buf, n);
mbedtls_free(buf);
return ret;
}
/*
* Load and parse a public key
*/
int mbedtls_pk_parse_public_keyfile(mbedtls_pk_context *ctx, const char *path)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t n;
unsigned char *buf;
if ((ret = mbedtls_pk_load_file(path, &buf, &n)) != 0) {
return ret;
}
ret = mbedtls_pk_parse_public_key(ctx, buf, n);
mbedtls_platform_zeroize(buf, n);
mbedtls_free(buf);
return ret;
}
#endif /* MBEDTLS_FS_IO */
#if defined(MBEDTLS_ECP_LIGHT)
/* Minimally parse an ECParameters buffer to and mbedtls_asn1_buf
*
* ECParameters ::= CHOICE {
* namedCurve OBJECT IDENTIFIER
* specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
* -- implicitCurve NULL
* }
*/
static int pk_get_ecparams(unsigned char **p, const unsigned char *end,
mbedtls_asn1_buf *params)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if (end - *p < 1) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT,
MBEDTLS_ERR_ASN1_OUT_OF_DATA);
}
/* Tag may be either OID or SEQUENCE */
params->tag = **p;
if (params->tag != MBEDTLS_ASN1_OID
#if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
&& params->tag != (MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)
#endif
) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT,
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
}
if ((ret = mbedtls_asn1_get_tag(p, end, ¶ms->len, params->tag)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
}
params->p = *p;
*p += params->len;
if (*p != end) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
return 0;
}
#if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
/*
* Parse a SpecifiedECDomain (SEC 1 C.2) and (mostly) fill the group with it.
* WARNING: the resulting group should only be used with
* pk_group_id_from_specified(), since its base point may not be set correctly
* if it was encoded compressed.
*
* SpecifiedECDomain ::= SEQUENCE {
* version SpecifiedECDomainVersion(ecdpVer1 | ecdpVer2 | ecdpVer3, ...),
* fieldID FieldID {{FieldTypes}},
* curve Curve,
* base ECPoint,
* order INTEGER,
* cofactor INTEGER OPTIONAL,
* hash HashAlgorithm OPTIONAL,
* ...
* }
*
* We only support prime-field as field type, and ignore hash and cofactor.
*/
static int pk_group_from_specified(const mbedtls_asn1_buf *params, mbedtls_ecp_group *grp)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char *p = params->p;
const unsigned char *const end = params->p + params->len;
const unsigned char *end_field, *end_curve;
size_t len;
int ver;
/* SpecifiedECDomainVersion ::= INTEGER { 1, 2, 3 } */
if ((ret = mbedtls_asn1_get_int(&p, end, &ver)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
}
if (ver < 1 || ver > 3) {
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
}
/*
* FieldID { FIELD-ID:IOSet } ::= SEQUENCE { -- Finite field
* fieldType FIELD-ID.&id({IOSet}),
* parameters FIELD-ID.&Type({IOSet}{@fieldType})
* }
*/
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
return ret;
}
end_field = p + len;
/*
* FIELD-ID ::= TYPE-IDENTIFIER
* FieldTypes FIELD-ID ::= {
* { Prime-p IDENTIFIED BY prime-field } |
* { Characteristic-two IDENTIFIED BY characteristic-two-field }
* }
* prime-field OBJECT IDENTIFIER ::= { id-fieldType 1 }
*/
if ((ret = mbedtls_asn1_get_tag(&p, end_field, &len, MBEDTLS_ASN1_OID)) != 0) {
return ret;
}
if (len != MBEDTLS_OID_SIZE(MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD) ||
memcmp(p, MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD, len) != 0) {
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
}
p += len;
/* Prime-p ::= INTEGER -- Field of size p. */
if ((ret = mbedtls_asn1_get_mpi(&p, end_field, &grp->P)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
}
grp->pbits = mbedtls_mpi_bitlen(&grp->P);
if (p != end_field) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
/*
* Curve ::= SEQUENCE {
* a FieldElement,
* b FieldElement,
* seed BIT STRING OPTIONAL
* -- Shall be present if used in SpecifiedECDomain
* -- with version equal to ecdpVer2 or ecdpVer3
* }
*/
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
return ret;
}
end_curve = p + len;
/*
* FieldElement ::= OCTET STRING
* containing an integer in the case of a prime field
*/
if ((ret = mbedtls_asn1_get_tag(&p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING)) != 0 ||
(ret = mbedtls_mpi_read_binary(&grp->A, p, len)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
}
p += len;
if ((ret = mbedtls_asn1_get_tag(&p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING)) != 0 ||
(ret = mbedtls_mpi_read_binary(&grp->B, p, len)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
}
p += len;
/* Ignore seed BIT STRING OPTIONAL */
if ((ret = mbedtls_asn1_get_tag(&p, end_curve, &len, MBEDTLS_ASN1_BIT_STRING)) == 0) {
p += len;
}
if (p != end_curve) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
/*
* ECPoint ::= OCTET STRING
*/
if ((ret = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OCTET_STRING)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
}
if ((ret = mbedtls_ecp_point_read_binary(grp, &grp->G,
(const unsigned char *) p, len)) != 0) {
/*
* If we can't read the point because it's compressed, cheat by
* reading only the X coordinate and the parity bit of Y.
*/
if (ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE ||
(p[0] != 0x02 && p[0] != 0x03) ||
len != mbedtls_mpi_size(&grp->P) + 1 ||
mbedtls_mpi_read_binary(&grp->G.X, p + 1, len - 1) != 0 ||
mbedtls_mpi_lset(&grp->G.Y, p[0] - 2) != 0 ||
mbedtls_mpi_lset(&grp->G.Z, 1) != 0) {
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
}
}
p += len;
/*
* order INTEGER
*/
if ((ret = mbedtls_asn1_get_mpi(&p, end, &grp->N)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
}
grp->nbits = mbedtls_mpi_bitlen(&grp->N);
/*
* Allow optional elements by purposefully not enforcing p == end here.
*/
return 0;
}
/*
* Find the group id associated with an (almost filled) group as generated by
* pk_group_from_specified(), or return an error if unknown.
*/
static int pk_group_id_from_group(const mbedtls_ecp_group *grp, mbedtls_ecp_group_id *grp_id)
{
int ret = 0;
mbedtls_ecp_group ref;
const mbedtls_ecp_group_id *id;
mbedtls_ecp_group_init(&ref);
for (id = mbedtls_ecp_grp_id_list(); *id != MBEDTLS_ECP_DP_NONE; id++) {
/* Load the group associated to that id */
mbedtls_ecp_group_free(&ref);
MBEDTLS_MPI_CHK(mbedtls_ecp_group_load(&ref, *id));
/* Compare to the group we were given, starting with easy tests */
if (grp->pbits == ref.pbits && grp->nbits == ref.nbits &&
mbedtls_mpi_cmp_mpi(&grp->P, &ref.P) == 0 &&
mbedtls_mpi_cmp_mpi(&grp->A, &ref.A) == 0 &&
mbedtls_mpi_cmp_mpi(&grp->B, &ref.B) == 0 &&
mbedtls_mpi_cmp_mpi(&grp->N, &ref.N) == 0 &&
mbedtls_mpi_cmp_mpi(&grp->G.X, &ref.G.X) == 0 &&
mbedtls_mpi_cmp_mpi(&grp->G.Z, &ref.G.Z) == 0 &&
/* For Y we may only know the parity bit, so compare only that */
mbedtls_mpi_get_bit(&grp->G.Y, 0) == mbedtls_mpi_get_bit(&ref.G.Y, 0)) {
break;
}
}
cleanup:
mbedtls_ecp_group_free(&ref);
*grp_id = *id;
if (ret == 0 && *id == MBEDTLS_ECP_DP_NONE) {
ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
}
return ret;
}
/*
* Parse a SpecifiedECDomain (SEC 1 C.2) and find the associated group ID
*/
static int pk_group_id_from_specified(const mbedtls_asn1_buf *params,
mbedtls_ecp_group_id *grp_id)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_ecp_group grp;
mbedtls_ecp_group_init(&grp);
if ((ret = pk_group_from_specified(params, &grp)) != 0) {
goto cleanup;
}
ret = pk_group_id_from_group(&grp, grp_id);
cleanup:
/* The API respecting lifecycle for mbedtls_ecp_group struct is
* _init(), _load() and _free(). In pk_group_id_from_specified() the
* temporary grp breaks that flow and it's members are populated
* by pk_group_id_from_group(). As such mbedtls_ecp_group_free()
* which is assuming a group populated by _setup() may not clean-up
* properly -> Manually free it's members.
*/
mbedtls_mpi_free(&grp.N);
mbedtls_mpi_free(&grp.P);
mbedtls_mpi_free(&grp.A);
mbedtls_mpi_free(&grp.B);
mbedtls_ecp_point_free(&grp.G);
return ret;
}
#endif /* MBEDTLS_PK_PARSE_EC_EXTENDED */
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
/* Functions pk_use_ecparams() and pk_use_ecparams_rfc8410() update the
* ecp_keypair structure with proper group ID. The purpose of this helper
* function is to update ec_family and ec_bits accordingly. */
static int pk_update_psa_ecparams(mbedtls_pk_context *pk,
mbedtls_ecp_group_id grp_id)
{
psa_ecc_family_t ec_family;
size_t bits;
ec_family = mbedtls_ecc_group_to_psa(grp_id, &bits);
if ((pk->ec_family != 0) && (pk->ec_family != ec_family)) {
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
}
pk->ec_family = ec_family;
pk->ec_bits = bits;
return 0;
}
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
/*
* Use EC parameters to initialise an EC group
*
* ECParameters ::= CHOICE {
* namedCurve OBJECT IDENTIFIER
* specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
* -- implicitCurve NULL
*/
static int pk_use_ecparams(const mbedtls_asn1_buf *params, mbedtls_pk_context *pk)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_ecp_group_id grp_id;
if (params->tag == MBEDTLS_ASN1_OID) {
if (mbedtls_oid_get_ec_grp(params, &grp_id) != 0) {
return MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE;
}
} else {
#if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
if ((ret = pk_group_id_from_specified(params, &grp_id)) != 0) {
return ret;
}
#else
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
#endif
}
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
ret = pk_update_psa_ecparams(pk, grp_id);
#else
/* 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;
}
if ((ret = mbedtls_ecp_group_load(&(mbedtls_pk_ec_rw(*pk)->grp),
grp_id)) != 0) {
return ret;
}
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
return ret;
}
/*
* Helper function for deriving a public key from its private counterpart.
*/
static int pk_derive_public_key(mbedtls_pk_context *pk,
const unsigned char *d, size_t d_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
int ret;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_status_t status;
(void) f_rng;
(void) p_rng;
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
(void) d;
(void) d_len;
status = psa_export_public_key(pk->priv_id, pk->pub_raw, sizeof(pk->pub_raw),
&pk->pub_raw_len);
ret = psa_pk_status_to_mbedtls(status);
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
mbedtls_ecp_keypair *eck = (mbedtls_ecp_keypair *) pk->pk_ctx;
unsigned char key_buf[MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH];
size_t key_len;
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT;
size_t curve_bits;
psa_ecc_family_t curve = mbedtls_ecc_group_to_psa(eck->grp.id, &curve_bits);
psa_status_t destruction_status;
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, d, d_len, &key_id);
ret = psa_pk_status_to_mbedtls(status);
if (ret != 0) {
return ret;
}
status = psa_export_public_key(key_id, key_buf, sizeof(key_buf), &key_len);
ret = psa_pk_status_to_mbedtls(status);
destruction_status = psa_destroy_key(key_id);
if (ret != 0) {
return ret;
} else if (destruction_status != PSA_SUCCESS) {
return psa_pk_status_to_mbedtls(destruction_status);
}
ret = mbedtls_ecp_point_read_binary(&eck->grp, &eck->Q, key_buf, key_len);
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
#else /* MBEDTLS_USE_PSA_CRYPTO */
mbedtls_ecp_keypair *eck = (mbedtls_ecp_keypair *) pk->pk_ctx;
(void) d;
(void) d_len;
ret = mbedtls_ecp_mul(&eck->grp, &eck->Q, &eck->d, &eck->grp.G, f_rng, p_rng);
#endif /* MBEDTLS_USE_PSA_CRYPTO */
return ret;
}
#if defined(MBEDTLS_PK_HAVE_RFC8410_CURVES)
/*
* Load an RFC8410 EC key, which doesn't have any parameters
*/
static int pk_use_ecparams_rfc8410(const mbedtls_asn1_buf *params,
mbedtls_ecp_group_id grp_id,
mbedtls_pk_context *pk)
{
int ret;
if (params->tag != 0 || params->len != 0) {
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
}
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
ret = pk_update_psa_ecparams(pk, grp_id);
#else
mbedtls_ecp_keypair *ecp = mbedtls_pk_ec_rw(*pk);
ret = mbedtls_ecp_group_load(&(ecp->grp), grp_id);
if (ret != 0) {
return ret;
}
#endif
return ret;
}
/*
* Parse an RFC 8410 encoded private EC key
*
* CurvePrivateKey ::= OCTET STRING
*/
static int pk_parse_key_rfc8410_der(mbedtls_pk_context *pk,
unsigned char *key, size_t keylen, const unsigned char *end,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len;
if ((ret = mbedtls_asn1_get_tag(&key, (key + keylen), &len, MBEDTLS_ASN1_OCTET_STRING)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
}
if (key + len != end) {
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
}
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_status_t status;
psa_set_key_type(&attributes, PSA_KEY_TYPE_ECC_KEY_PAIR(pk->ec_family));
psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_EXPORT |
PSA_KEY_USAGE_DERIVE);
psa_set_key_algorithm(&attributes, PSA_ALG_ECDH);
status = psa_import_key(&attributes, key, len, &pk->priv_id);
if (status != PSA_SUCCESS) {
ret = psa_pk_status_to_mbedtls(status);
return ret;
}
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
mbedtls_ecp_keypair *eck = mbedtls_pk_ec_rw(*pk);
if ((ret = mbedtls_mpi_read_binary_le(&eck->d, key, len)) != 0) {
mbedtls_ecp_keypair_free(eck);
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
}
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
/* 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_derive_public_key(pk, key, len, f_rng, p_rng)) != 0) {
#if !defined(MBEDTLS_PK_USE_PSA_EC_DATA)
mbedtls_ecp_keypair_free(eck);
#endif /* !MBEDTLS_PK_USE_PSA_EC_DATA */
return ret;
}
/* When MBEDTLS_PK_USE_PSA_EC_DATA the key is checked while importing it
* into PSA. */
#if !defined(MBEDTLS_PK_USE_PSA_EC_DATA)
if ((ret = mbedtls_ecp_check_privkey(&eck->grp, &eck->d)) != 0) {
mbedtls_ecp_keypair_free(eck);
return ret;
}
#endif /* !MBEDTLS_PK_USE_PSA_EC_DATA */
return 0;
}
#endif /* MBEDTLS_PK_HAVE_RFC8410_CURVES */
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
/*
* Create a temporary ecp_keypair for converting an EC point in compressed
* format to an uncompressed one
*/
static int pk_convert_compressed_ec(mbedtls_pk_context *pk,
const unsigned char *in_start, size_t in_len,
size_t *out_buf_len, unsigned char *out_buf,
size_t out_buf_size)
{
mbedtls_ecp_keypair ecp_key;
mbedtls_ecp_group_id ecp_group_id;
int ret;
ecp_group_id = mbedtls_ecc_group_of_psa(pk->ec_family, pk->ec_bits, 0);
mbedtls_ecp_keypair_init(&ecp_key);
ret = mbedtls_ecp_group_load(&(ecp_key.grp), ecp_group_id);
if (ret != 0) {
return ret;
}
ret = mbedtls_ecp_point_read_binary(&(ecp_key.grp), &ecp_key.Q,
in_start, in_len);
if (ret != 0) {
goto exit;
}
ret = mbedtls_ecp_point_write_binary(&(ecp_key.grp), &ecp_key.Q,
MBEDTLS_ECP_PF_UNCOMPRESSED,
out_buf_len, out_buf, out_buf_size);
exit:
mbedtls_ecp_keypair_free(&ecp_key);
return ret;
}
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
/*
* EC public key is an EC point
*
* The caller is responsible for clearing the structure upon failure if
* desired. Take care to pass along the possible ECP_FEATURE_UNAVAILABLE
* return code of mbedtls_ecp_point_read_binary() and leave p in a usable state.
*/
static int pk_get_ecpubkey(unsigned char **p, const unsigned char *end,
mbedtls_pk_context *pk)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
mbedtls_svc_key_id_t key;
psa_key_attributes_t key_attrs = PSA_KEY_ATTRIBUTES_INIT;
size_t len = (end - *p);
if (len > PSA_EXPORT_PUBLIC_KEY_MAX_SIZE) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
/* Compressed point format are not supported yet by PSA crypto. As a
* consequence ecp functions are used to "convert" the point to
* uncompressed format */
if ((**p == 0x02) || (**p == 0x03)) {
ret = pk_convert_compressed_ec(pk, *p, len,
&(pk->pub_raw_len), pk->pub_raw,
PSA_EXPORT_PUBLIC_KEY_MAX_SIZE);
if (ret != 0) {
return ret;
}
} else {
/* Uncompressed format */
if ((end - *p) > MBEDTLS_PK_MAX_EC_PUBKEY_RAW_LEN) {
return MBEDTLS_ERR_PK_BUFFER_TOO_SMALL;
}
memcpy(pk->pub_raw, *p, (end - *p));
pk->pub_raw_len = end - *p;
}
/* Validate the key by trying to importing it */
psa_set_key_usage_flags(&key_attrs, 0);
psa_set_key_algorithm(&key_attrs, PSA_ALG_ECDSA_ANY);
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) != PSA_SUCCESS) ||
(psa_destroy_key(key) != PSA_SUCCESS)) {
mbedtls_platform_zeroize(pk->pub_raw, MBEDTLS_PK_MAX_EC_PUBKEY_RAW_LEN);
pk->pub_raw_len = 0;
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
ret = 0;
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
mbedtls_ecp_keypair *ec_key = (mbedtls_ecp_keypair *) pk->pk_ctx;
if ((ret = mbedtls_ecp_point_read_binary(&ec_key->grp, &ec_key->Q,
(const unsigned char *) *p,
end - *p)) == 0) {
ret = mbedtls_ecp_check_pubkey(&ec_key->grp, &ec_key->Q);
}
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
/*
* We know mbedtls_ecp_point_read_binary consumed all bytes or failed
*/
*p = (unsigned char *) end;
return ret;
}
#endif /* MBEDTLS_ECP_LIGHT */
#if defined(MBEDTLS_RSA_C)
/*
* RSAPublicKey ::= SEQUENCE {
* modulus INTEGER, -- n
* publicExponent INTEGER -- e
* }
*/
static int pk_get_rsapubkey(unsigned char **p,
const unsigned char *end,
mbedtls_rsa_context *rsa)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len;
if ((ret = mbedtls_asn1_get_tag(p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY, ret);
}
if (*p + len != end) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
/* Import N */
if ((ret = mbedtls_asn1_get_tag(p, end, &len, MBEDTLS_ASN1_INTEGER)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY, ret);
}
if ((ret = mbedtls_rsa_import_raw(rsa, *p, len, NULL, 0, NULL, 0,
NULL, 0, NULL, 0)) != 0) {
return MBEDTLS_ERR_PK_INVALID_PUBKEY;
}
*p += len;
/* Import E */
if ((ret = mbedtls_asn1_get_tag(p, end, &len, MBEDTLS_ASN1_INTEGER)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY, ret);
}
if ((ret = mbedtls_rsa_import_raw(rsa, NULL, 0, NULL, 0, NULL, 0,
NULL, 0, *p, len)) != 0) {
return MBEDTLS_ERR_PK_INVALID_PUBKEY;
}
*p += len;
if (mbedtls_rsa_complete(rsa) != 0 ||
mbedtls_rsa_check_pubkey(rsa) != 0) {
return MBEDTLS_ERR_PK_INVALID_PUBKEY;
}
if (*p != end) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
return 0;
}
#endif /* MBEDTLS_RSA_C */
/* Get a PK algorithm identifier
*
* AlgorithmIdentifier ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* parameters ANY DEFINED BY algorithm OPTIONAL }
*/
static int pk_get_pk_alg(unsigned char **p,
const unsigned char *end,
mbedtls_pk_type_t *pk_alg, mbedtls_asn1_buf *params,
mbedtls_ecp_group_id *ec_grp_id)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_asn1_buf alg_oid;
memset(params, 0, sizeof(mbedtls_asn1_buf));
if ((ret = mbedtls_asn1_get_alg(p, end, &alg_oid, params)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_ALG, ret);
}
ret = mbedtls_oid_get_pk_alg(&alg_oid, pk_alg);
#if defined(MBEDTLS_ECP_LIGHT)
if (ret == MBEDTLS_ERR_OID_NOT_FOUND) {
ret = mbedtls_oid_get_ec_grp_algid(&alg_oid, ec_grp_id);
if (ret == 0) {
*pk_alg = MBEDTLS_PK_ECKEY;
}
}
#else
(void) ec_grp_id;
#endif
if (ret != 0) {
return MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
}
/*
* No parameters with RSA (only for EC)
*/
if (*pk_alg == MBEDTLS_PK_RSA &&
((params->tag != MBEDTLS_ASN1_NULL && params->tag != 0) ||
params->len != 0)) {
return MBEDTLS_ERR_PK_INVALID_ALG;
}
return 0;
}
/*
* SubjectPublicKeyInfo ::= SEQUENCE {
* algorithm AlgorithmIdentifier,
* subjectPublicKey BIT STRING }
*/
int mbedtls_pk_parse_subpubkey(unsigned char **p, const unsigned char *end,
mbedtls_pk_context *pk)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len;
mbedtls_asn1_buf alg_params;
mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
mbedtls_ecp_group_id ec_grp_id = MBEDTLS_ECP_DP_NONE;
const mbedtls_pk_info_t *pk_info;
if ((ret = mbedtls_asn1_get_tag(p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
}
end = *p + len;
if ((ret = pk_get_pk_alg(p, end, &pk_alg, &alg_params, &ec_grp_id)) != 0) {
return ret;
}
if ((ret = mbedtls_asn1_get_bitstring_null(p, end, &len)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY, ret);
}
if (*p + len != end) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
if ((pk_info = mbedtls_pk_info_from_type(pk_alg)) == NULL) {
return MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
}
if ((ret = mbedtls_pk_setup(pk, pk_info)) != 0) {
return ret;
}
#if defined(MBEDTLS_RSA_C)
if (pk_alg == MBEDTLS_PK_RSA) {
ret = pk_get_rsapubkey(p, end, mbedtls_pk_rsa(*pk));
} else
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_ECP_LIGHT)
if (pk_alg == MBEDTLS_PK_ECKEY_DH || pk_alg == MBEDTLS_PK_ECKEY) {
#if defined(MBEDTLS_PK_HAVE_RFC8410_CURVES)
if (MBEDTLS_PK_IS_RFC8410_GROUP_ID(ec_grp_id)) {
ret = pk_use_ecparams_rfc8410(&alg_params, ec_grp_id, pk);
} else
#endif
{
ret = pk_use_ecparams(&alg_params, pk);
}
if (ret == 0) {
ret = pk_get_ecpubkey(p, end, pk);
}
} else
#endif /* MBEDTLS_ECP_LIGHT */
ret = MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
if (ret == 0 && *p != end) {
ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
if (ret != 0) {
mbedtls_pk_free(pk);
}
return ret;
}
#if defined(MBEDTLS_RSA_C)
/*
* Wrapper around mbedtls_asn1_get_mpi() that rejects zero.
*
* The value zero is:
* - never a valid value for an RSA parameter
* - interpreted as "omitted, please reconstruct" by mbedtls_rsa_complete().
*
* Since values can't be omitted in PKCS#1, passing a zero value to
* rsa_complete() would be incorrect, so reject zero values early.
*/
static int asn1_get_nonzero_mpi(unsigned char **p,
const unsigned char *end,
mbedtls_mpi *X)
{
int ret;
ret = mbedtls_asn1_get_mpi(p, end, X);
if (ret != 0) {
return ret;
}