--- /dev/null
+/* 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) ||
+ !parse_key_type(&algorithm, &type) ||
+ !CBS_get_asn1(&spki, &key, CBS_ASN1_BITSTRING) ||
+ CBS_len(&spki) != 0 ||
+ // 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) ||
+ !parse_key_type(&algorithm, &type) ||
+ !CBS_get_asn1(&pkcs8, &key, CBS_ASN1_OCTETSTRING)) {
+ OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
+ 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(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;
+ }
+}
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