[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/asn1t.h>
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| 13 | #include <openssl/x509.h>
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| 14 | #include "internal/asn1_int.h"
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| 15 | #include "internal/evp_int.h"
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| 16 | #include "internal/x509_int.h"
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| 17 | #include <openssl/rsa.h>
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| 18 | #include <openssl/dsa.h>
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| 19 |
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| 20 | struct X509_pubkey_st {
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| 21 | X509_ALGOR *algor;
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| 22 | ASN1_BIT_STRING *public_key;
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| 23 | EVP_PKEY *pkey;
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| 24 | };
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| 25 |
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| 26 | static int x509_pubkey_decode(EVP_PKEY **pk, X509_PUBKEY *key);
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| 27 |
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| 28 | /* Minor tweak to operation: free up EVP_PKEY */
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| 29 | static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
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| 30 | void *exarg)
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| 31 | {
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| 32 | if (operation == ASN1_OP_FREE_POST) {
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| 33 | X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
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| 34 | EVP_PKEY_free(pubkey->pkey);
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| 35 | } else if (operation == ASN1_OP_D2I_POST) {
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| 36 | /* Attempt to decode public key and cache in pubkey structure. */
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| 37 | X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
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| 38 | EVP_PKEY_free(pubkey->pkey);
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| 39 | /*
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| 40 | * Opportunistically decode the key but remove any non fatal errors
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| 41 | * from the queue. Subsequent explicit attempts to decode/use the key
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| 42 | * will return an appropriate error.
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| 43 | */
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| 44 | ERR_set_mark();
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| 45 | if (x509_pubkey_decode(&pubkey->pkey, pubkey) == -1)
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| 46 | return 0;
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| 47 | ERR_pop_to_mark();
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| 48 | }
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| 49 | return 1;
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| 50 | }
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| 51 |
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| 52 | ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
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| 53 | ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
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| 54 | ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
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| 55 | } ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
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| 56 |
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| 57 | IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
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| 58 |
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| 59 | int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
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| 60 | {
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| 61 | X509_PUBKEY *pk = NULL;
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| 62 |
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| 63 | if (x == NULL)
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| 64 | return (0);
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| 65 |
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| 66 | if ((pk = X509_PUBKEY_new()) == NULL)
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| 67 | goto error;
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| 68 |
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| 69 | if (pkey->ameth) {
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| 70 | if (pkey->ameth->pub_encode) {
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| 71 | if (!pkey->ameth->pub_encode(pk, pkey)) {
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| 72 | X509err(X509_F_X509_PUBKEY_SET,
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| 73 | X509_R_PUBLIC_KEY_ENCODE_ERROR);
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| 74 | goto error;
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| 75 | }
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| 76 | } else {
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| 77 | X509err(X509_F_X509_PUBKEY_SET, X509_R_METHOD_NOT_SUPPORTED);
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| 78 | goto error;
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| 79 | }
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| 80 | } else {
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| 81 | X509err(X509_F_X509_PUBKEY_SET, X509_R_UNSUPPORTED_ALGORITHM);
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| 82 | goto error;
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| 83 | }
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| 84 |
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| 85 | X509_PUBKEY_free(*x);
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| 86 | *x = pk;
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| 87 | pk->pkey = pkey;
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| 88 | EVP_PKEY_up_ref(pkey);
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| 89 | return 1;
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| 90 |
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| 91 | error:
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| 92 | X509_PUBKEY_free(pk);
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| 93 | return 0;
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| 94 | }
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| 95 |
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| 96 | /*
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| 97 | * Attempt to decode a public key.
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| 98 | * Returns 1 on success, 0 for a decode failure and -1 for a fatal
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| 99 | * error e.g. malloc failure.
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| 100 | */
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| 101 |
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| 102 |
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| 103 | static int x509_pubkey_decode(EVP_PKEY **ppkey, X509_PUBKEY *key)
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| 104 | {
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| 105 | EVP_PKEY *pkey = EVP_PKEY_new();
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| 106 |
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| 107 | if (pkey == NULL) {
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| 108 | X509err(X509_F_X509_PUBKEY_DECODE, ERR_R_MALLOC_FAILURE);
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| 109 | return -1;
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| 110 | }
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| 111 |
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| 112 | if (!EVP_PKEY_set_type(pkey, OBJ_obj2nid(key->algor->algorithm))) {
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| 113 | X509err(X509_F_X509_PUBKEY_DECODE, X509_R_UNSUPPORTED_ALGORITHM);
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| 114 | goto error;
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| 115 | }
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| 116 |
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| 117 | if (pkey->ameth->pub_decode) {
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| 118 | /*
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| 119 | * Treat any failure of pub_decode as a decode error. In
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| 120 | * future we could have different return codes for decode
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| 121 | * errors and fatal errors such as malloc failure.
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| 122 | */
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| 123 | if (!pkey->ameth->pub_decode(pkey, key)) {
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| 124 | X509err(X509_F_X509_PUBKEY_DECODE, X509_R_PUBLIC_KEY_DECODE_ERROR);
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| 125 | goto error;
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| 126 | }
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| 127 | } else {
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| 128 | X509err(X509_F_X509_PUBKEY_DECODE, X509_R_METHOD_NOT_SUPPORTED);
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| 129 | goto error;
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| 130 | }
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| 131 |
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| 132 | *ppkey = pkey;
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| 133 | return 1;
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| 134 |
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| 135 | error:
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| 136 | EVP_PKEY_free(pkey);
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| 137 | return 0;
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| 138 | }
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| 139 |
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| 140 | EVP_PKEY *X509_PUBKEY_get0(X509_PUBKEY *key)
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| 141 | {
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| 142 | EVP_PKEY *ret = NULL;
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| 143 |
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| 144 | if (key == NULL || key->public_key == NULL)
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| 145 | return NULL;
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| 146 |
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| 147 | if (key->pkey != NULL)
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| 148 | return key->pkey;
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| 149 |
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| 150 | /*
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| 151 | * When the key ASN.1 is initially parsed an attempt is made to
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| 152 | * decode the public key and cache the EVP_PKEY structure. If this
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| 153 | * operation fails the cached value will be NULL. Parsing continues
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| 154 | * to allow parsing of unknown key types or unsupported forms.
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| 155 | * We repeat the decode operation so the appropriate errors are left
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| 156 | * in the queue.
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| 157 | */
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| 158 | x509_pubkey_decode(&ret, key);
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| 159 | /* If decode doesn't fail something bad happened */
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| 160 | if (ret != NULL) {
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| 161 | X509err(X509_F_X509_PUBKEY_GET0, ERR_R_INTERNAL_ERROR);
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| 162 | EVP_PKEY_free(ret);
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| 163 | }
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| 164 |
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| 165 | return NULL;
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| 166 | }
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| 167 |
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| 168 | EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
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| 169 | {
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| 170 | EVP_PKEY *ret = X509_PUBKEY_get0(key);
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| 171 | if (ret != NULL)
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| 172 | EVP_PKEY_up_ref(ret);
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| 173 | return ret;
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| 174 | }
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| 175 |
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| 176 | /*
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| 177 | * Now two pseudo ASN1 routines that take an EVP_PKEY structure and encode or
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| 178 | * decode as X509_PUBKEY
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| 179 | */
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| 180 |
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| 181 | EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length)
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| 182 | {
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| 183 | X509_PUBKEY *xpk;
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| 184 | EVP_PKEY *pktmp;
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| 185 | const unsigned char *q;
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| 186 | q = *pp;
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| 187 | xpk = d2i_X509_PUBKEY(NULL, &q, length);
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| 188 | if (!xpk)
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| 189 | return NULL;
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| 190 | pktmp = X509_PUBKEY_get(xpk);
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| 191 | X509_PUBKEY_free(xpk);
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| 192 | if (!pktmp)
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| 193 | return NULL;
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| 194 | *pp = q;
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| 195 | if (a) {
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| 196 | EVP_PKEY_free(*a);
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| 197 | *a = pktmp;
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| 198 | }
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| 199 | return pktmp;
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| 200 | }
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| 201 |
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| 202 | int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
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| 203 | {
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| 204 | X509_PUBKEY *xpk = NULL;
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| 205 | int ret;
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| 206 | if (!a)
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| 207 | return 0;
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| 208 | if (!X509_PUBKEY_set(&xpk, a))
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| 209 | return 0;
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| 210 | ret = i2d_X509_PUBKEY(xpk, pp);
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| 211 | X509_PUBKEY_free(xpk);
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| 212 | return ret;
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| 213 | }
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| 214 |
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| 215 | /*
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| 216 | * The following are equivalents but which return RSA and DSA keys
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| 217 | */
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| 218 | #ifndef OPENSSL_NO_RSA
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| 219 | RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length)
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| 220 | {
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| 221 | EVP_PKEY *pkey;
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| 222 | RSA *key;
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| 223 | const unsigned char *q;
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| 224 | q = *pp;
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| 225 | pkey = d2i_PUBKEY(NULL, &q, length);
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| 226 | if (!pkey)
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| 227 | return NULL;
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| 228 | key = EVP_PKEY_get1_RSA(pkey);
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| 229 | EVP_PKEY_free(pkey);
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| 230 | if (!key)
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| 231 | return NULL;
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| 232 | *pp = q;
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| 233 | if (a) {
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| 234 | RSA_free(*a);
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| 235 | *a = key;
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| 236 | }
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| 237 | return key;
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| 238 | }
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| 239 |
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| 240 | int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
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| 241 | {
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| 242 | EVP_PKEY *pktmp;
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| 243 | int ret;
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| 244 | if (!a)
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| 245 | return 0;
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| 246 | pktmp = EVP_PKEY_new();
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| 247 | if (pktmp == NULL) {
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| 248 | ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
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| 249 | return 0;
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| 250 | }
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| 251 | EVP_PKEY_set1_RSA(pktmp, a);
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| 252 | ret = i2d_PUBKEY(pktmp, pp);
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| 253 | EVP_PKEY_free(pktmp);
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| 254 | return ret;
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| 255 | }
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| 256 | #endif
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| 257 |
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| 258 | #ifndef OPENSSL_NO_DSA
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| 259 | DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length)
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| 260 | {
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| 261 | EVP_PKEY *pkey;
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| 262 | DSA *key;
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| 263 | const unsigned char *q;
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| 264 | q = *pp;
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| 265 | pkey = d2i_PUBKEY(NULL, &q, length);
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| 266 | if (!pkey)
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| 267 | return NULL;
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| 268 | key = EVP_PKEY_get1_DSA(pkey);
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| 269 | EVP_PKEY_free(pkey);
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| 270 | if (!key)
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| 271 | return NULL;
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| 272 | *pp = q;
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| 273 | if (a) {
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| 274 | DSA_free(*a);
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| 275 | *a = key;
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| 276 | }
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| 277 | return key;
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| 278 | }
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| 279 |
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| 280 | int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
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| 281 | {
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| 282 | EVP_PKEY *pktmp;
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| 283 | int ret;
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| 284 | if (!a)
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| 285 | return 0;
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| 286 | pktmp = EVP_PKEY_new();
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| 287 | if (pktmp == NULL) {
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| 288 | ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
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| 289 | return 0;
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| 290 | }
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| 291 | EVP_PKEY_set1_DSA(pktmp, a);
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| 292 | ret = i2d_PUBKEY(pktmp, pp);
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| 293 | EVP_PKEY_free(pktmp);
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| 294 | return ret;
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| 295 | }
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| 296 | #endif
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| 297 |
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| 298 | #ifndef OPENSSL_NO_EC
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| 299 | EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
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| 300 | {
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| 301 | EVP_PKEY *pkey;
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| 302 | EC_KEY *key;
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| 303 | const unsigned char *q;
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| 304 | q = *pp;
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| 305 | pkey = d2i_PUBKEY(NULL, &q, length);
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| 306 | if (!pkey)
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| 307 | return (NULL);
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| 308 | key = EVP_PKEY_get1_EC_KEY(pkey);
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| 309 | EVP_PKEY_free(pkey);
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| 310 | if (!key)
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| 311 | return (NULL);
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| 312 | *pp = q;
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| 313 | if (a) {
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| 314 | EC_KEY_free(*a);
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| 315 | *a = key;
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| 316 | }
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| 317 | return (key);
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| 318 | }
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| 319 |
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| 320 | int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
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| 321 | {
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| 322 | EVP_PKEY *pktmp;
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| 323 | int ret;
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| 324 | if (!a)
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| 325 | return (0);
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| 326 | if ((pktmp = EVP_PKEY_new()) == NULL) {
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| 327 | ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
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| 328 | return (0);
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| 329 | }
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| 330 | EVP_PKEY_set1_EC_KEY(pktmp, a);
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| 331 | ret = i2d_PUBKEY(pktmp, pp);
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| 332 | EVP_PKEY_free(pktmp);
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| 333 | return (ret);
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| 334 | }
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| 335 | #endif
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| 336 |
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| 337 | int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
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| 338 | int ptype, void *pval,
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| 339 | unsigned char *penc, int penclen)
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| 340 | {
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| 341 | if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
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| 342 | return 0;
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| 343 | if (penc) {
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| 344 | OPENSSL_free(pub->public_key->data);
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| 345 | pub->public_key->data = penc;
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| 346 | pub->public_key->length = penclen;
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| 347 | /* Set number of unused bits to zero */
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| 348 | pub->public_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
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| 349 | pub->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;
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| 350 | }
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| 351 | return 1;
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| 352 | }
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| 353 |
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| 354 | int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
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| 355 | const unsigned char **pk, int *ppklen,
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| 356 | X509_ALGOR **pa, X509_PUBKEY *pub)
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| 357 | {
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| 358 | if (ppkalg)
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| 359 | *ppkalg = pub->algor->algorithm;
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| 360 | if (pk) {
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| 361 | *pk = pub->public_key->data;
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| 362 | *ppklen = pub->public_key->length;
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| 363 | }
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| 364 | if (pa)
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| 365 | *pa = pub->algor;
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| 366 | return 1;
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| 367 | }
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| 368 |
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| 369 | ASN1_BIT_STRING *X509_get0_pubkey_bitstr(const X509 *x)
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| 370 | {
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| 371 | if (x == NULL)
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| 372 | return NULL;
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| 373 | return x->cert_info.key->public_key;
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| 374 | }
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