| /* |
| * 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 <string.h> |
| |
| #if defined(MBEDTLS_RSA_C) |
| #include "mbedtls/rsa.h" |
| #endif |
| #if defined(MBEDTLS_ECP_C) |
| #include "mbedtls/ecp.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 |
| |
| #include "mbedtls/platform.h" |
| |
| #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_C) |
| /* 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 */ |
| |
| /* |
| * 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_ecp_group *grp) |
| { |
| 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 |
| } |
| |
| /* |
| * grp may already be initialized; if so, make sure IDs match |
| */ |
| if (grp->id != MBEDTLS_ECP_DP_NONE && grp->id != grp_id) { |
| return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT; |
| } |
| |
| if ((ret = mbedtls_ecp_group_load(grp, grp_id)) != 0) { |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * 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_ecp_keypair *key) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| |
| if ((ret = mbedtls_ecp_point_read_binary(&key->grp, &key->Q, |
| (const unsigned char *) *p, end - *p)) == 0) { |
| ret = mbedtls_ecp_check_pubkey(&key->grp, &key->Q); |
| } |
| |
| /* |
| * We know mbedtls_ecp_point_read_binary consumed all bytes or failed |
| */ |
| *p = (unsigned char *) end; |
| |
| return ret; |
| } |
| #endif /* MBEDTLS_ECP_C */ |
| |
| #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) |
| { |
| 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); |
| } |
| |
| if (mbedtls_oid_get_pk_alg(&alg_oid, pk_alg) != 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; |
| 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)) != 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_C) |
| if (pk_alg == MBEDTLS_PK_ECKEY_DH || pk_alg == MBEDTLS_PK_ECKEY) { |
| ret = pk_use_ecparams(&alg_params, &mbedtls_pk_ec(*pk)->grp); |
| if (ret == 0) { |
| ret = pk_get_ecpubkey(p, end, mbedtls_pk_ec(*pk)); |
| } |
| } else |
| #endif /* MBEDTLS_ECP_C */ |
| 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; |
| } |
| |
| if (mbedtls_mpi_cmp_int(X, 0) == 0) { |
| return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Parse a PKCS#1 encoded private RSA key |
| */ |
| static int pk_parse_key_pkcs1_der(mbedtls_rsa_context *rsa, |
| const unsigned char *key, |
| size_t keylen) |
| { |
| int ret, version; |
| size_t len; |
| unsigned char *p, *end; |
| |
| mbedtls_mpi T; |
| mbedtls_mpi_init(&T); |
| |
| p = (unsigned char *) key; |
| end = p + keylen; |
| |
| /* |
| * This function parses the RSAPrivateKey (PKCS#1) |
| * |
| * RSAPrivateKey ::= SEQUENCE { |
| * version Version, |
| * modulus INTEGER, -- n |
| * publicExponent INTEGER, -- e |
| * privateExponent INTEGER, -- d |
| * prime1 INTEGER, -- p |
| * prime2 INTEGER, -- q |
| * exponent1 INTEGER, -- d mod (p-1) |
| * exponent2 INTEGER, -- d mod (q-1) |
| * coefficient INTEGER, -- (inverse of q) mod p |
| * otherPrimeInfos OtherPrimeInfos OPTIONAL |
| * } |
| */ |
| 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 = mbedtls_asn1_get_int(&p, end, &version)) != 0) { |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret); |
| } |
| |
| if (version != 0) { |
| return MBEDTLS_ERR_PK_KEY_INVALID_VERSION; |
| } |
| |
| /* Import N */ |
| if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 || |
| (ret = mbedtls_rsa_import(rsa, &T, NULL, NULL, |
| NULL, NULL)) != 0) { |
| goto cleanup; |
| } |
| |
| /* Import E */ |
| if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 || |
| (ret = mbedtls_rsa_import(rsa, NULL, NULL, NULL, |
| NULL, &T)) != 0) { |
| goto cleanup; |
| } |
| |
| /* Import D */ |
| if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 || |
| (ret = mbedtls_rsa_import(rsa, NULL, NULL, NULL, |
| &T, NULL)) != 0) { |
| goto cleanup; |
| } |
| |
| /* Import P */ |
| if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 || |
| (ret = mbedtls_rsa_import(rsa, NULL, &T, NULL, |
| NULL, NULL)) != 0) { |
| goto cleanup; |
| } |
| |
| /* Import Q */ |
| if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 || |
| (ret = mbedtls_rsa_import(rsa, NULL, NULL, &T, |
| NULL, NULL)) != 0) { |
| goto cleanup; |
| } |
| |
| #if !defined(MBEDTLS_RSA_NO_CRT) && !defined(MBEDTLS_RSA_ALT) |
| /* |
| * The RSA CRT parameters DP, DQ and QP are nominally redundant, in |
| * that they can be easily recomputed from D, P and Q. However by |
| * parsing them from the PKCS1 structure it is possible to avoid |
| * recalculating them which both reduces the overhead of loading |
| * RSA private keys into memory and also avoids side channels which |
| * can arise when computing those values, since all of D, P, and Q |
| * are secret. See https://eprint.iacr.org/2020/055 for a |
| * description of one such attack. |
| */ |
| |
| /* Import DP */ |
| if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 || |
| (ret = mbedtls_mpi_copy(&rsa->DP, &T)) != 0) { |
| goto cleanup; |
| } |
| |
| /* Import DQ */ |
| if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 || |
| (ret = mbedtls_mpi_copy(&rsa->DQ, &T)) != 0) { |
| goto cleanup; |
| } |
| |
| /* Import QP */ |
| if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 || |
| (ret = mbedtls_mpi_copy(&rsa->QP, &T)) != 0) { |
| goto cleanup; |
| } |
| |
| #else |
| /* Verify existence of the CRT params */ |
| if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 || |
| (ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 || |
| (ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0) { |
| goto cleanup; |
| } |
| #endif |
| |
| /* rsa_complete() doesn't complete anything with the default |
| * implementation but is still called: |
| * - for the benefit of alternative implementation that may want to |
| * pre-compute stuff beyond what's provided (eg Montgomery factors) |
| * - as is also sanity-checks the key |
| * |
| * Furthermore, we also check the public part for consistency with |
| * mbedtls_pk_parse_pubkey(), as it includes size minima for example. |
| */ |
| if ((ret = mbedtls_rsa_complete(rsa)) != 0 || |
| (ret = mbedtls_rsa_check_pubkey(rsa)) != 0) { |
| goto cleanup; |
| } |
| |
| if (p != end) { |
| ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH); |
| } |
| |
| cleanup: |
| |
| mbedtls_mpi_free(&T); |
| |
| if (ret != 0) { |
| /* Wrap error code if it's coming from a lower level */ |
| if ((ret & 0xff80) == 0) { |
| ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret); |
| } else { |
| ret = MBEDTLS_ERR_PK_KEY_INVALID_FORMAT; |
| } |
| |
| mbedtls_rsa_free(rsa); |
| } |
| |
| return ret; |
| } |
| #endif /* MBEDTLS_RSA_C */ |
| |
| #if defined(MBEDTLS_ECP_C) |
| /* |
| * Parse a SEC1 encoded private EC key |
| */ |
| static int pk_parse_key_sec1_der(mbedtls_ecp_keypair *eck, |
| const unsigned char *key, size_t keylen, |
| int (*f_rng)(void *, unsigned char *, size_t), void *p_rng) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| int version, pubkey_done; |
| size_t len; |
| mbedtls_asn1_buf params = { 0, 0, NULL }; |
| unsigned char *p = (unsigned char *) key; |
| unsigned char *end = p + keylen; |
| unsigned char *end2; |
| |
| /* |
| * RFC 5915, or SEC1 Appendix C.4 |
| * |
| * ECPrivateKey ::= SEQUENCE { |
| * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1), |
| * privateKey OCTET STRING, |
| * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL, |
| * publicKey [1] BIT STRING OPTIONAL |
| * } |
| */ |
| 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 = mbedtls_asn1_get_int(&p, end, &version)) != 0) { |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret); |
| } |
| |
| if (version != 1) { |
| return MBEDTLS_ERR_PK_KEY_INVALID_VERSION; |
| } |
| |
| 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_mpi_read_binary(&eck->d, p, len)) != 0) { |
| mbedtls_ecp_keypair_free(eck); |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret); |
| } |
| |
| p += len; |
| |
| pubkey_done = 0; |
| if (p != end) { |
| /* |
| * Is 'parameters' present? |
| */ |
| if ((ret = mbedtls_asn1_get_tag(&p, end, &len, |
| MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | |
| 0)) == 0) { |
| if ((ret = pk_get_ecparams(&p, p + len, ¶ms)) != 0 || |
| (ret = pk_use_ecparams(¶ms, &eck->grp)) != 0) { |
| mbedtls_ecp_keypair_free(eck); |
| return ret; |
| } |
| } else if (ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) { |
| mbedtls_ecp_keypair_free(eck); |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret); |
| } |
| } |
| |
| if (p != end) { |
| /* |
| * Is 'publickey' present? If not, or if we can't read it (eg because it |
| * is compressed), create it from the private key. |
| */ |
| if ((ret = mbedtls_asn1_get_tag(&p, end, &len, |
| MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | |
| 1)) == 0) { |
| end2 = p + len; |
| |
| if ((ret = mbedtls_asn1_get_bitstring_null(&p, end2, &len)) != 0) { |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret); |
| } |
| |
| if (p + len != end2) { |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH); |
| } |
| |
| if ((ret = pk_get_ecpubkey(&p, end2, eck)) == 0) { |
| pubkey_done = 1; |
| } else { |
| /* |
| * The only acceptable failure mode of pk_get_ecpubkey() above |
| * is if the point format is not recognized. |
| */ |
| if (ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE) { |
| return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT; |
| } |
| } |
| } else if (ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) { |
| mbedtls_ecp_keypair_free(eck); |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret); |
| } |
| } |
| |
| if (!pubkey_done && |
| (ret = mbedtls_ecp_mul(&eck->grp, &eck->Q, &eck->d, &eck->grp.G, |
| f_rng, p_rng)) != 0) { |
| mbedtls_ecp_keypair_free(eck); |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret); |
| } |
| |
| if ((ret = mbedtls_ecp_check_privkey(&eck->grp, &eck->d)) != 0) { |
| mbedtls_ecp_keypair_free(eck); |
| return ret; |
| } |
| |
| return 0; |
| } |
| #endif /* MBEDTLS_ECP_C */ |
| |
| /* |
| * Parse an unencrypted PKCS#8 encoded private key |
| * |
| * Notes: |
| * |
| * - This function does not own the key buffer. It is the |
| * responsibility of the caller to take care of zeroizing |
| * and freeing it after use. |
| * |
| * - The function is responsible for freeing the provided |
| * PK context on failure. |
| * |
| */ |
| static int pk_parse_key_pkcs8_unencrypted_der( |
| mbedtls_pk_context *pk, |
| const unsigned char *key, size_t keylen, |
| int (*f_rng)(void *, unsigned char *, size_t), void *p_rng) |
| { |
| int ret, version; |
| size_t len; |
| mbedtls_asn1_buf params; |
| unsigned char *p = (unsigned char *) key; |
| unsigned char *end = p + keylen; |
| mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE; |
| const mbedtls_pk_info_t *pk_info; |
| |
| #if !defined(MBEDTLS_ECP_C) |
| (void) f_rng; |
| (void) p_rng; |
| #endif |
| |
| /* |
| * This function parses the PrivateKeyInfo object (PKCS#8 v1.2 = RFC 5208) |
| * |
| * PrivateKeyInfo ::= SEQUENCE { |
| * version Version, |
| * privateKeyAlgorithm PrivateKeyAlgorithmIdentifier, |
| * privateKey PrivateKey, |
| * attributes [0] IMPLICIT Attributes OPTIONAL } |
| * |
| * Version ::= INTEGER |
| * PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier |
| * PrivateKey ::= OCTET STRING |
| * |
| * The PrivateKey OCTET STRING is a SEC1 ECPrivateKey |
| */ |
| |
| 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 = mbedtls_asn1_get_int(&p, end, &version)) != 0) { |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret); |
| } |
| |
| if (version != 0) { |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_VERSION, ret); |
| } |
| |
| if ((ret = pk_get_pk_alg(&p, end, &pk_alg, ¶ms)) != 0) { |
| return ret; |
| } |
| |
| 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 (len < 1) { |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, |
| MBEDTLS_ERR_ASN1_OUT_OF_DATA); |
| } |
| |
| 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) { |
| if ((ret = pk_parse_key_pkcs1_der(mbedtls_pk_rsa(*pk), p, len)) != 0) { |
| mbedtls_pk_free(pk); |
| return ret; |
| } |
| } else |
| #endif /* MBEDTLS_RSA_C */ |
| #if defined(MBEDTLS_ECP_C) |
| if (pk_alg == MBEDTLS_PK_ECKEY || pk_alg == MBEDTLS_PK_ECKEY_DH) { |
| if ((ret = pk_use_ecparams(¶ms, &mbedtls_pk_ec(*pk)->grp)) != 0 || |
| (ret = pk_parse_key_sec1_der(mbedtls_pk_ec(*pk), p, len, f_rng, p_rng)) != 0) { |
| mbedtls_pk_free(pk); |
| return ret; |
| } |
| } else |
| #endif /* MBEDTLS_ECP_C */ |
| return MBEDTLS_ERR_PK_UNKNOWN_PK_ALG; |
| |
| return 0; |
| } |
| |
| /* |
| * Parse an encrypted PKCS#8 encoded private key |
| * |
| * To save space, the decryption happens in-place on the given key buffer. |
| * Also, while this function may modify the keybuffer, it doesn't own it, |
| * and instead it is the responsibility of the caller to zeroize and properly |
| * free it after use. |
| * |
| */ |
| #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C) |
| static int pk_parse_key_pkcs8_encrypted_der( |
| mbedtls_pk_context *pk, |
| unsigned char *key, size_t keylen, |
| const unsigned char *pwd, size_t pwdlen, |
| int (*f_rng)(void *, unsigned char *, size_t), void *p_rng) |
| { |
| int ret, decrypted = 0; |
| size_t len; |
| unsigned char *buf; |
| unsigned char *p, *end; |
| mbedtls_asn1_buf pbe_alg_oid, pbe_params; |
| #if defined(MBEDTLS_PKCS12_C) |
| mbedtls_cipher_type_t cipher_alg; |
| mbedtls_md_type_t md_alg; |
| #endif |
| |
| p = key; |
| end = p + keylen; |
| |
| if (pwdlen == 0) { |
| return MBEDTLS_ERR_PK_PASSWORD_REQUIRED; |
| } |
| |
| /* |
| * This function parses the EncryptedPrivateKeyInfo object (PKCS#8) |
| * |
| * EncryptedPrivateKeyInfo ::= SEQUENCE { |
| * encryptionAlgorithm EncryptionAlgorithmIdentifier, |
| * encryptedData EncryptedData |
| * } |
| * |
| * EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier |
| * |
| * EncryptedData ::= OCTET STRING |
| * |
| * The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo |
| * |
| */ |
| 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 = mbedtls_asn1_get_alg(&p, end, &pbe_alg_oid, &pbe_params)) != 0) { |
| return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret); |
| } |
| |
| 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); |
| } |
| |
| buf = p; |
| |
| /* |
| * Decrypt EncryptedData with appropriate PBE |
| */ |
| #if defined(MBEDTLS_PKCS12_C) |
| if (mbedtls_oid_get_pkcs12_pbe_alg(&pbe_alg_oid, &md_alg, &cipher_alg) == 0) { |
| if ((ret = mbedtls_pkcs12_pbe(&pbe_params, MBEDTLS_PKCS12_PBE_DECRYPT, |
| cipher_alg, md_alg, |
| pwd, pwdlen, p, len, buf)) != 0) { |
| if (ret == MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH) { |
| return MBEDTLS_ERR_PK_PASSWORD_MISMATCH; |
| } |
| |
| return ret; |
| } |
| |
| decrypted = 1; |
| } else |
| #endif /* MBEDTLS_PKCS12_C */ |
| #if defined(MBEDTLS_PKCS5_C) |
| if (MBEDTLS_OID_CMP(MBEDTLS_OID_PKCS5_PBES2, &pbe_alg_oid) == 0) { |
| if ((ret = mbedtls_pkcs5_pbes2(&pbe_params, MBEDTLS_PKCS5_DECRYPT, pwd, pwdlen, |
| p, len, buf)) != 0) { |
| if (ret == MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH) { |
| return MBEDTLS_ERR_PK_PASSWORD_MISMATCH; |
| } |
| |
| return ret; |
| } |
| |
| decrypted = 1; |
| } else |
| #endif /* MBEDTLS_PKCS5_C */ |
| { |
| ((void) pwd); |
| } |
| |
| if (decrypted == 0) { |
| return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE; |
| } |
| |
| return pk_parse_key_pkcs8_unencrypted_der(pk, buf, len, f_rng, p_rng); |
| } |
| #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */ |
| |
| /* |
| * Parse a private key |
| */ |
| int mbedtls_pk_parse_key(mbedtls_pk_context *pk, |
| const unsigned char *key, size_t keylen, |
| const unsigned char *pwd, size_t pwdlen, |
| int (*f_rng)(void *, unsigned char *, size_t), void *p_rng) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| const mbedtls_pk_info_t *pk_info; |
| #if defined(MBEDTLS_PEM_PARSE_C) |
| size_t len; |
| mbedtls_pem_context pem; |
| #endif |
| |
| if (keylen == 0) { |
| return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT; |
| } |
| |
| #if defined(MBEDTLS_PEM_PARSE_C) |
| mbedtls_pem_init(&pem); |
| |
| #if defined(MBEDTLS_RSA_C) |
| /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */ |
| if (key[keylen - 1] != '\0') { |
| ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT; |
| } else { |
| ret = mbedtls_pem_read_buffer(&pem, |
| "-----BEGIN RSA PRIVATE KEY-----", |
| "-----END RSA PRIVATE KEY-----", |
| key, pwd, pwdlen, &len); |
| } |
| |
| if (ret == 0) { |
| pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_RSA); |
| if ((ret = mbedtls_pk_setup(pk, pk_info)) != 0 || |
| (ret = pk_parse_key_pkcs1_der(mbedtls_pk_rsa(*pk), |
| pem.buf, pem.buflen)) != 0) { |
| mbedtls_pk_free(pk); |
| } |
| |
| mbedtls_pem_free(&pem); |
| return ret; |
| } else if (ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH) { |
| return MBEDTLS_ERR_PK_PASSWORD_MISMATCH; |
| } else if (ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED) { |
| return MBEDTLS_ERR_PK_PASSWORD_REQUIRED; |
| } else if (ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) { |
| return ret; |
| } |
| #endif /* MBEDTLS_RSA_C */ |
| |
| #if defined(MBEDTLS_ECP_C) |
| /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */ |
| if (key[keylen - 1] != '\0') { |
| ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT; |
| } else { |
| ret = mbedtls_pem_read_buffer(&pem, |
| "-----BEGIN EC PRIVATE KEY-----", |
| "-----END EC PRIVATE KEY-----", |
| key, pwd, pwdlen, &len); |
| } |
| if (ret == 0) { |
| pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_ECKEY); |
| |
| if ((ret = mbedtls_pk_setup(pk, pk_info)) != 0 || |
| (ret = pk_parse_key_sec1_der(mbedtls_pk_ec(*pk), |
| pem.buf, pem.buflen, |
| f_rng, p_rng)) != 0) { |
| mbedtls_pk_free(pk); |
| } |
| |
| mbedtls_pem_free(&pem); |
| return ret; |
| } else if (ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH) { |
| return MBEDTLS_ERR_PK_PASSWORD_MISMATCH; |
| } else if (ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED) { |
| return MBEDTLS_ERR_PK_PASSWORD_REQUIRED; |
| } else if (ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) { |
| return ret; |
| } |
| #endif /* MBEDTLS_ECP_C */ |
| |
| /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */ |
| if (key[keylen - 1] != '\0') { |
| ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT; |
| } else { |
| ret = mbedtls_pem_read_buffer(&pem, |
| "-----BEGIN PRIVATE KEY-----", |
| "-----END PRIVATE KEY-----", |
| key, NULL, 0, &len); |
| } |
| if (ret == 0) { |
| if ((ret = pk_parse_key_pkcs8_unencrypted_der(pk, |
| pem.buf, pem.buflen, f_rng, p_rng)) != 0) { |
| mbedtls_pk_free(pk); |
| } |
| |
| mbedtls_pem_free(&pem); |
| return ret; |
| } else if (ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) { |
| return ret; |
| } |
| |
| #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C) |
| /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */ |
| if (key[keylen - 1] != '\0') { |
| ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT; |
| } else { |
| ret = mbedtls_pem_read_buffer(&pem, |
| "-----BEGIN ENCRYPTED PRIVATE KEY-----", |
| "-----END ENCRYPTED PRIVATE KEY-----", |
| key, NULL, 0, &len); |
| } |
| if (ret == 0) { |
| if ((ret = pk_parse_key_pkcs8_encrypted_der(pk, pem.buf, pem.buflen, |
| pwd, pwdlen, f_rng, p_rng)) != 0) { |
| mbedtls_pk_free(pk); |
| } |
| |
| mbedtls_pem_free(&pem); |
| return ret; |
| } else if (ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) { |
| return ret; |
| } |
| #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */ |
| #else |
| ((void) pwd); |
| ((void) pwdlen); |
| #endif /* MBEDTLS_PEM_PARSE_C */ |
| |
| /* |
| * At this point we only know it's not a PEM formatted key. Could be any |
| * of the known DER encoded private key formats |
| * |
| * We try the different DER format parsers to see if one passes without |
| * error |
| */ |
| #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C) |
| if (pwdlen != 0) { |
| unsigned char *key_copy; |
| |
| if ((key_copy = mbedtls_calloc(1, keylen)) == NULL) { |
| return MBEDTLS_ERR_PK_ALLOC_FAILED; |
| } |
| |
| memcpy(key_copy, key, keylen); |
| |
| ret = pk_parse_key_pkcs8_encrypted_der(pk, key_copy, keylen, |
| pwd, pwdlen, f_rng, p_rng); |
| |
| mbedtls_platform_zeroize(key_copy, keylen); |
| mbedtls_free(key_copy); |
| } |
| |
| if (ret == 0) { |
| return 0; |
| } |
| |
| mbedtls_pk_free(pk); |
| mbedtls_pk_init(pk); |
| |
| if (ret == MBEDTLS_ERR_PK_PASSWORD_MISMATCH) { |
| return ret; |
| } |
| #endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */ |
| |
| ret = pk_parse_key_pkcs8_unencrypted_der(pk, key, keylen, f_rng, p_rng); |
| if (ret == 0) { |
| return 0; |
| } |
| |
| mbedtls_pk_free(pk); |
| mbedtls_pk_init(pk); |
| |
| #if defined(MBEDTLS_RSA_C) |
| |
| pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_RSA); |
| if (mbedtls_pk_setup(pk, pk_info) == 0 && |
| pk_parse_key_pkcs1_der(mbedtls_pk_rsa(*pk), key, keylen) == 0) { |
| return 0; |
| } |
| |
| mbedtls_pk_free(pk); |
| mbedtls_pk_init(pk); |
| #endif /* MBEDTLS_RSA_C */ |
| |
| #if defined(MBEDTLS_ECP_C) |
| pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_ECKEY); |
| if (mbedtls_pk_setup(pk, pk_info) == 0 && |
| pk_parse_key_sec1_der(mbedtls_pk_ec(*pk), |
| key, keylen, f_rng, p_rng) == 0) { |
| return 0; |
| } |
| mbedtls_pk_free(pk); |
| #endif /* MBEDTLS_ECP_C */ |
| |
| /* If MBEDTLS_RSA_C is defined but MBEDTLS_ECP_C isn't, |
| * it is ok to leave the PK context initialized but not |
| * freed: It is the caller's responsibility to call pk_init() |
| * before calling this function, and to call pk_free() |
| * when it fails. If MBEDTLS_ECP_C is defined but MBEDTLS_RSA_C |
| * isn't, this leads to mbedtls_pk_free() being called |
| * twice, once here and once by the caller, but this is |
| * also ok and in line with the mbedtls_pk_free() calls |
| * on failed PEM parsing attempts. */ |
| |
| return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT; |
| } |
| |
| /* |
| * Parse a public key |
| */ |
| int mbedtls_pk_parse_public_key(mbedtls_pk_context *ctx, |
| const unsigned char *key, size_t keylen) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| unsigned char *p; |
| #if defined(MBEDTLS_RSA_C) |
| const mbedtls_pk_info_t *pk_info; |
| #endif |
| #if defined(MBEDTLS_PEM_PARSE_C) |
| size_t len; |
| mbedtls_pem_context pem; |
| #endif |
| |
| if (keylen == 0) { |
| return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT; |
| } |
| |
| #if defined(MBEDTLS_PEM_PARSE_C) |
| mbedtls_pem_init(&pem); |
| #if defined(MBEDTLS_RSA_C) |
| /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */ |
| if (key[keylen - 1] != '\0') { |
| ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT; |
| } else { |
| ret = mbedtls_pem_read_buffer(&pem, |
| "-----BEGIN RSA PUBLIC KEY-----", |
| "-----END RSA PUBLIC KEY-----", |
| key, NULL, 0, &len); |
| } |
| |
| if (ret == 0) { |
| p = pem.buf; |
| if ((pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_RSA)) == NULL) { |
| mbedtls_pem_free(&pem); |
| return MBEDTLS_ERR_PK_UNKNOWN_PK_ALG; |
| } |
| |
| if ((ret = mbedtls_pk_setup(ctx, pk_info)) != 0) { |
| mbedtls_pem_free(&pem); |
| return ret; |
| } |
| |
| if ((ret = pk_get_rsapubkey(&p, p + pem.buflen, mbedtls_pk_rsa(*ctx))) != 0) { |
| mbedtls_pk_free(ctx); |
| } |
| |
| mbedtls_pem_free(&pem); |
| return ret; |
| } else if (ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) { |
| mbedtls_pem_free(&pem); |
| return ret; |
| } |
| #endif /* MBEDTLS_RSA_C */ |
| |
| /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */ |
| if (key[keylen - 1] != '\0') { |
| ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT; |
| } else { |
| ret = mbedtls_pem_read_buffer(&pem, |
| "-----BEGIN PUBLIC KEY-----", |
| "-----END PUBLIC KEY-----", |
| key, NULL, 0, &len); |
| } |
| |
| if (ret == 0) { |
| /* |
| * Was PEM encoded |
| */ |
| p = pem.buf; |
| |
| ret = mbedtls_pk_parse_subpubkey(&p, p + pem.buflen, ctx); |
| mbedtls_pem_free(&pem); |
| return ret; |
| } else if (ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) { |
| mbedtls_pem_free(&pem); |
| return ret; |
| } |
| mbedtls_pem_free(&pem); |
| #endif /* MBEDTLS_PEM_PARSE_C */ |
| |
| #if defined(MBEDTLS_RSA_C) |
| if ((pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_RSA)) == NULL) { |
| return MBEDTLS_ERR_PK_UNKNOWN_PK_ALG; |
| } |
| |
| if ((ret = mbedtls_pk_setup(ctx, pk_info)) != 0) { |
| return ret; |
| } |
| |
| p = (unsigned char *) key; |
| ret = pk_get_rsapubkey(&p, p + keylen, mbedtls_pk_rsa(*ctx)); |
| if (ret == 0) { |
| return ret; |
| } |
| mbedtls_pk_free(ctx); |
| if (ret != (MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY, |
| MBEDTLS_ERR_ASN1_UNEXPECTED_TAG))) { |
| return ret; |
| } |
| #endif /* MBEDTLS_RSA_C */ |
| p = (unsigned char *) key; |
| |
| ret = mbedtls_pk_parse_subpubkey(&p, p + keylen, ctx); |
| |
| return ret; |
| } |
| |
| #endif /* MBEDTLS_PK_PARSE_C */ |