/* 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_grpc/evp.h>
#include <string.h>
#include <openssl_grpc/bytestring.h>
#include <openssl_grpc/dsa.h>
#include <openssl_grpc/ec_key.h>
#include <openssl_grpc/err.h>
#include <openssl_grpc/rsa.h>
#include "internal.h"
#include "../bytestring/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,
&x25519_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-initialized |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;
}
EVP_PKEY *d2i_PUBKEY(EVP_PKEY **out, const uint8_t **inp, long len) {
if (len < 0) {
return NULL;
}
CBS cbs;
CBS_init(&cbs, *inp, (size_t)len);
EVP_PKEY *ret = EVP_parse_public_key(&cbs);
if (ret == NULL) {
return NULL;
}
if (out != NULL) {
EVP_PKEY_free(*out);
*out = ret;
}
*inp = CBS_data(&cbs);
return ret;
}
int i2d_PUBKEY(const EVP_PKEY *pkey, uint8_t **outp) {
if (pkey == NULL) {
return 0;
}
CBB cbb;
if (!CBB_init(&cbb, 128) ||
!EVP_marshal_public_key(&cbb, pkey)) {
CBB_cleanup(&cbb);
return -1;
}
return CBB_finish_i2d(&cbb, outp);
}
RSA *d2i_RSA_PUBKEY(RSA **out, const uint8_t **inp, long len) {
if (len < 0) {
return NULL;
}
CBS cbs;
CBS_init(&cbs, *inp, (size_t)len);
EVP_PKEY *pkey = EVP_parse_public_key(&cbs);
if (pkey == NULL) {
return NULL;
}
RSA *rsa = EVP_PKEY_get1_RSA(pkey);
EVP_PKEY_free(pkey);
if (rsa == NULL) {
return NULL;
}
if (out != NULL) {
RSA_free(*out);
*out = rsa;
}
*inp = CBS_data(&cbs);
return rsa;
}
int i2d_RSA_PUBKEY(const RSA *rsa, uint8_t **outp) {
if (rsa == NULL) {
return 0;
}
int ret = -1;
EVP_PKEY *pkey = EVP_PKEY_new();
if (pkey == NULL ||
!EVP_PKEY_set1_RSA(pkey, (RSA *)rsa)) {
goto err;
}
ret = i2d_PUBKEY(pkey, outp);
err:
EVP_PKEY_free(pkey);
return ret;
}
DSA *d2i_DSA_PUBKEY(DSA **out, const uint8_t **inp, long len) {
if (len < 0) {
return NULL;
}
CBS cbs;
CBS_init(&cbs, *inp, (size_t)len);
EVP_PKEY *pkey = EVP_parse_public_key(&cbs);
if (pkey == NULL) {
return NULL;
}
DSA *dsa = EVP_PKEY_get1_DSA(pkey);
EVP_PKEY_free(pkey);
if (dsa == NULL) {
return NULL;
}
if (out != NULL) {
DSA_free(*out);
*out = dsa;
}
*inp = CBS_data(&cbs);
return dsa;
}
int i2d_DSA_PUBKEY(const DSA *dsa, uint8_t **outp) {
if (dsa == NULL) {
return 0;
}
int ret = -1;
EVP_PKEY *pkey = EVP_PKEY_new();
if (pkey == NULL ||
!EVP_PKEY_set1_DSA(pkey, (DSA *)dsa)) {
goto err;
}
ret = i2d_PUBKEY(pkey, outp);
err:
EVP_PKEY_free(pkey);
return ret;
}
EC_KEY *d2i_EC_PUBKEY(EC_KEY **out, const uint8_t **inp, long len) {
if (len < 0) {
return NULL;
}
CBS cbs;
CBS_init(&cbs, *inp, (size_t)len);
EVP_PKEY *pkey = EVP_parse_public_key(&cbs);
if (pkey == NULL) {
return NULL;
}
EC_KEY *ec_key = EVP_PKEY_get1_EC_KEY(pkey);
EVP_PKEY_free(pkey);
if (ec_key == NULL) {
return NULL;
}
if (out != NULL) {
EC_KEY_free(*out);
*out = ec_key;
}
*inp = CBS_data(&cbs);
return ec_key;
}
int i2d_EC_PUBKEY(const EC_KEY *ec_key, uint8_t **outp) {
if (ec_key == NULL) {
return 0;
}
int ret = -1;
EVP_PKEY *pkey = EVP_PKEY_new();
if (pkey == NULL ||
!EVP_PKEY_set1_EC_KEY(pkey, (EC_KEY *)ec_key)) {
goto err;
}
ret = i2d_PUBKEY(pkey, outp);
err:
EVP_PKEY_free(pkey);
return ret;
}