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- /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.] */
-
- #include <openssl/evp.h>
-
- #include <string.h>
-
- #include <openssl/bytestring.h>
- #include <openssl/dsa.h>
- #include <openssl/ec_key.h>
- #include <openssl/err.h>
- #include <openssl/rsa.h>
-
- #include "internal.h"
- #include "../internal.h"
-
-
- static const EVP_PKEY_ASN1_METHOD *const kASN1Methods[] = {
- &rsa_asn1_meth,
- &ec_asn1_meth,
- &dsa_asn1_meth,
- &ed25519_asn1_meth,
- };
-
- static int parse_key_type(CBS *cbs, int *out_type) {
- CBS oid;
- if (!CBS_get_asn1(cbs, &oid, CBS_ASN1_OBJECT)) {
- return 0;
- }
-
- for (unsigned i = 0; i < OPENSSL_ARRAY_SIZE(kASN1Methods); i++) {
- const EVP_PKEY_ASN1_METHOD *method = kASN1Methods[i];
- if (CBS_len(&oid) == method->oid_len &&
- OPENSSL_memcmp(CBS_data(&oid), method->oid, method->oid_len) == 0) {
- *out_type = method->pkey_id;
- return 1;
- }
- }
-
- return 0;
- }
-
- EVP_PKEY *EVP_parse_public_key(CBS *cbs) {
- // Parse the SubjectPublicKeyInfo.
- CBS spki, algorithm, key;
- int type;
- uint8_t padding;
- if (!CBS_get_asn1(cbs, &spki, CBS_ASN1_SEQUENCE) ||
- !CBS_get_asn1(&spki, &algorithm, CBS_ASN1_SEQUENCE) ||
- !CBS_get_asn1(&spki, &key, CBS_ASN1_BITSTRING) ||
- CBS_len(&spki) != 0) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
- return NULL;
- }
- if (!parse_key_type(&algorithm, &type)) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_ALGORITHM);
- return NULL;
- }
- if (// Every key type defined encodes the key as a byte string with the same
- // conversion to BIT STRING.
- !CBS_get_u8(&key, &padding) ||
- padding != 0) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
- return NULL;
- }
-
- // Set up an |EVP_PKEY| of the appropriate type.
- EVP_PKEY *ret = EVP_PKEY_new();
- if (ret == NULL ||
- !EVP_PKEY_set_type(ret, type)) {
- goto err;
- }
-
- // Call into the type-specific SPKI decoding function.
- if (ret->ameth->pub_decode == NULL) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_ALGORITHM);
- goto err;
- }
- if (!ret->ameth->pub_decode(ret, &algorithm, &key)) {
- goto err;
- }
-
- return ret;
-
- err:
- EVP_PKEY_free(ret);
- return NULL;
- }
-
- int EVP_marshal_public_key(CBB *cbb, const EVP_PKEY *key) {
- if (key->ameth == NULL || key->ameth->pub_encode == NULL) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_ALGORITHM);
- return 0;
- }
-
- return key->ameth->pub_encode(cbb, key);
- }
-
- EVP_PKEY *EVP_parse_private_key(CBS *cbs) {
- // Parse the PrivateKeyInfo.
- CBS pkcs8, algorithm, key;
- uint64_t version;
- int type;
- if (!CBS_get_asn1(cbs, &pkcs8, CBS_ASN1_SEQUENCE) ||
- !CBS_get_asn1_uint64(&pkcs8, &version) ||
- version != 0 ||
- !CBS_get_asn1(&pkcs8, &algorithm, CBS_ASN1_SEQUENCE) ||
- !CBS_get_asn1(&pkcs8, &key, CBS_ASN1_OCTETSTRING)) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
- return NULL;
- }
- if (!parse_key_type(&algorithm, &type)) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_ALGORITHM);
- return NULL;
- }
-
- // A PrivateKeyInfo ends with a SET of Attributes which we ignore.
-
- // Set up an |EVP_PKEY| of the appropriate type.
- EVP_PKEY *ret = EVP_PKEY_new();
- if (ret == NULL ||
- !EVP_PKEY_set_type(ret, type)) {
- goto err;
- }
-
- // Call into the type-specific PrivateKeyInfo decoding function.
- if (ret->ameth->priv_decode == NULL) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_ALGORITHM);
- goto err;
- }
- if (!ret->ameth->priv_decode(ret, &algorithm, &key)) {
- goto err;
- }
-
- return ret;
-
- err:
- EVP_PKEY_free(ret);
- return NULL;
- }
-
- int EVP_marshal_private_key(CBB *cbb, const EVP_PKEY *key) {
- if (key->ameth == NULL || key->ameth->priv_encode == NULL) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_ALGORITHM);
- return 0;
- }
-
- return key->ameth->priv_encode(cbb, key);
- }
-
- static EVP_PKEY *old_priv_decode(CBS *cbs, int type) {
- EVP_PKEY *ret = EVP_PKEY_new();
- if (ret == NULL) {
- return NULL;
- }
-
- switch (type) {
- case EVP_PKEY_EC: {
- EC_KEY *ec_key = EC_KEY_parse_private_key(cbs, NULL);
- if (ec_key == NULL || !EVP_PKEY_assign_EC_KEY(ret, ec_key)) {
- EC_KEY_free(ec_key);
- goto err;
- }
- return ret;
- }
- case EVP_PKEY_DSA: {
- DSA *dsa = DSA_parse_private_key(cbs);
- if (dsa == NULL || !EVP_PKEY_assign_DSA(ret, dsa)) {
- DSA_free(dsa);
- goto err;
- }
- return ret;
- }
- case EVP_PKEY_RSA: {
- RSA *rsa = RSA_parse_private_key(cbs);
- if (rsa == NULL || !EVP_PKEY_assign_RSA(ret, rsa)) {
- RSA_free(rsa);
- goto err;
- }
- return ret;
- }
- default:
- OPENSSL_PUT_ERROR(EVP, EVP_R_UNKNOWN_PUBLIC_KEY_TYPE);
- goto err;
- }
-
- err:
- EVP_PKEY_free(ret);
- return NULL;
- }
-
- EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **out, const uint8_t **inp,
- long len) {
- if (len < 0) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
- return NULL;
- }
-
- // Parse with the legacy format.
- CBS cbs;
- CBS_init(&cbs, *inp, (size_t)len);
- EVP_PKEY *ret = old_priv_decode(&cbs, type);
- if (ret == NULL) {
- // Try again with PKCS#8.
- ERR_clear_error();
- CBS_init(&cbs, *inp, (size_t)len);
- ret = EVP_parse_private_key(&cbs);
- if (ret == NULL) {
- return NULL;
- }
- if (ret->type != type) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_DIFFERENT_KEY_TYPES);
- EVP_PKEY_free(ret);
- return NULL;
- }
- }
-
- if (out != NULL) {
- EVP_PKEY_free(*out);
- *out = ret;
- }
- *inp = CBS_data(&cbs);
- return ret;
- }
-
- // num_elements parses one SEQUENCE from |in| and returns the number of elements
- // in it. On parse error, it returns zero.
- static size_t num_elements(const uint8_t *in, size_t in_len) {
- CBS cbs, sequence;
- CBS_init(&cbs, in, (size_t)in_len);
-
- if (!CBS_get_asn1(&cbs, &sequence, CBS_ASN1_SEQUENCE)) {
- return 0;
- }
-
- size_t count = 0;
- while (CBS_len(&sequence) > 0) {
- if (!CBS_get_any_asn1_element(&sequence, NULL, NULL, NULL)) {
- return 0;
- }
-
- count++;
- }
-
- return count;
- }
-
- EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **out, const uint8_t **inp, long len) {
- if (len < 0) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
- return NULL;
- }
-
- // Parse the input as a PKCS#8 PrivateKeyInfo.
- CBS cbs;
- CBS_init(&cbs, *inp, (size_t)len);
- EVP_PKEY *ret = EVP_parse_private_key(&cbs);
- if (ret != NULL) {
- if (out != NULL) {
- EVP_PKEY_free(*out);
- *out = ret;
- }
- *inp = CBS_data(&cbs);
- return ret;
- }
- ERR_clear_error();
-
- // Count the elements to determine the legacy key format.
- switch (num_elements(*inp, (size_t)len)) {
- case 4:
- return d2i_PrivateKey(EVP_PKEY_EC, out, inp, len);
-
- case 6:
- return d2i_PrivateKey(EVP_PKEY_DSA, out, inp, len);
-
- default:
- return d2i_PrivateKey(EVP_PKEY_RSA, out, inp, len);
- }
- }
-
- int i2d_PublicKey(const EVP_PKEY *key, uint8_t **outp) {
- switch (key->type) {
- case EVP_PKEY_RSA:
- return i2d_RSAPublicKey(key->pkey.rsa, outp);
- case EVP_PKEY_DSA:
- return i2d_DSAPublicKey(key->pkey.dsa, outp);
- case EVP_PKEY_EC:
- return i2o_ECPublicKey(key->pkey.ec, outp);
- default:
- OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
- return -1;
- }
- }
-
- EVP_PKEY *d2i_PublicKey(int type, EVP_PKEY **out, const uint8_t **inp,
- long len) {
- EVP_PKEY *ret = EVP_PKEY_new();
- if (ret == NULL) {
- return NULL;
- }
-
- CBS cbs;
- CBS_init(&cbs, *inp, len < 0 ? 0 : (size_t)len);
- switch (type) {
- case EVP_PKEY_RSA: {
- RSA *rsa = RSA_parse_public_key(&cbs);
- if (rsa == NULL || !EVP_PKEY_assign_RSA(ret, rsa)) {
- RSA_free(rsa);
- goto err;
- }
- break;
- }
-
- // Unlike OpenSSL, we do not support EC keys with this API. The raw EC
- // public key serialization requires knowing the group. In OpenSSL, calling
- // this function with |EVP_PKEY_EC| and setting |out| to NULL does not work.
- // It requires |*out| to include a partially-initiazed |EVP_PKEY| to extract
- // the group.
- default:
- OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
- goto err;
- }
-
- *inp = CBS_data(&cbs);
- if (out != NULL) {
- EVP_PKEY_free(*out);
- *out = ret;
- }
- return ret;
-
- err:
- EVP_PKEY_free(ret);
- return NULL;
- }
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