| /* 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, |
| }; |
| |
| static int parse_key_type(CBS *cbs, int *out_type) { |
| CBS oid; |
| if (!CBS_get_asn1(cbs, &oid, CBS_ASN1_OBJECT)) { |
| return 0; |
| } |
| |
| unsigned i; |
| for (i = 0; i < OPENSSL_ARRAY_SIZE(kASN1Methods); i++) { |
| const EVP_PKEY_ASN1_METHOD *method = kASN1Methods[i]; |
| if (CBS_len(&oid) == method->oid_len && |
| 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; |
| } |
| } |