2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include "internal/cryptlib.h"
12 #include <openssl/asn1t.h>
13 #include <openssl/x509.h>
14 #include "crypto/asn1.h"
15 #include "crypto/evp.h"
16 #include "crypto/x509.h"
17 #include <openssl/rsa.h>
18 #include <openssl/dsa.h>
19 #include <openssl/serializer.h>
21 struct X509_pubkey_st {
23 ASN1_BIT_STRING *public_key;
27 static int x509_pubkey_decode(EVP_PKEY **pk, X509_PUBKEY *key);
29 /* Minor tweak to operation: free up EVP_PKEY */
30 static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
33 if (operation == ASN1_OP_FREE_POST) {
34 X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
35 EVP_PKEY_free(pubkey->pkey);
36 } else if (operation == ASN1_OP_D2I_POST) {
37 /* Attempt to decode public key and cache in pubkey structure. */
38 X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
39 EVP_PKEY_free(pubkey->pkey);
42 * Opportunistically decode the key but remove any non fatal errors
43 * from the queue. Subsequent explicit attempts to decode/use the key
44 * will return an appropriate error.
47 if (x509_pubkey_decode(&pubkey->pkey, pubkey) == -1)
54 ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
55 ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
56 ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
57 } ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
59 IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
60 IMPLEMENT_ASN1_DUP_FUNCTION(X509_PUBKEY)
62 /* TODO should better be called X509_PUBKEY_set1 */
63 int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
65 X509_PUBKEY *pk = NULL;
73 if (pkey->ameth != NULL) {
74 if ((pk = X509_PUBKEY_new()) == NULL) {
75 X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
78 if (pkey->ameth->pub_encode != NULL) {
79 if (!pkey->ameth->pub_encode(pk, pkey)) {
80 X509err(X509_F_X509_PUBKEY_SET,
81 X509_R_PUBLIC_KEY_ENCODE_ERROR);
85 X509err(X509_F_X509_PUBKEY_SET, X509_R_METHOD_NOT_SUPPORTED);
88 } else if (pkey->pkeys[0].keymgmt != NULL) {
89 BIO *bmem = BIO_new(BIO_s_mem());
90 const char *serprop = "format=der,type=public";
91 OSSL_SERIALIZER_CTX *sctx =
92 OSSL_SERIALIZER_CTX_new_by_EVP_PKEY(pkey, serprop);
94 if (OSSL_SERIALIZER_to_bio(sctx, bmem)) {
95 const unsigned char *der = NULL;
96 long derlen = BIO_get_mem_data(bmem, (char **)&der);
98 pk = d2i_X509_PUBKEY(NULL, &der, derlen);
101 OSSL_SERIALIZER_CTX_free(sctx);
108 X509_PUBKEY_free(*x);
109 if (!EVP_PKEY_up_ref(pkey)) {
110 X509err(X509_F_X509_PUBKEY_SET, ERR_R_INTERNAL_ERROR);
116 * pk->pkey is NULL when using the legacy routine, but is non-NULL when
117 * going through the serializer, and for all intents and purposes, it's
118 * a perfect copy of |pkey|, just not the same instance. In that case,
119 * we could simply return early, right here.
120 * However, in the interest of being cautious leaning on paranoia, some
121 * application might very well depend on the passed |pkey| being used
122 * and none other, so we spend a few more cycles throwing away the newly
123 * created |pk->pkey| and replace it with |pkey|.
124 * TODO(3.0) Investigate if it's safe to change to simply return here
125 * if |pk->pkey != NULL|.
127 if (pk->pkey != NULL)
128 EVP_PKEY_free(pk->pkey);
134 X509err(X509_F_X509_PUBKEY_SET, X509_R_UNSUPPORTED_ALGORITHM);
137 X509_PUBKEY_free(pk);
142 * Attempt to decode a public key.
143 * Returns 1 on success, 0 for a decode failure and -1 for a fatal
144 * error e.g. malloc failure.
148 static int x509_pubkey_decode(EVP_PKEY **ppkey, X509_PUBKEY *key)
150 EVP_PKEY *pkey = EVP_PKEY_new();
153 X509err(X509_F_X509_PUBKEY_DECODE, ERR_R_MALLOC_FAILURE);
157 if (!EVP_PKEY_set_type(pkey, OBJ_obj2nid(key->algor->algorithm))) {
158 X509err(X509_F_X509_PUBKEY_DECODE, X509_R_UNSUPPORTED_ALGORITHM);
162 if (pkey->ameth->pub_decode) {
164 * Treat any failure of pub_decode as a decode error. In
165 * future we could have different return codes for decode
166 * errors and fatal errors such as malloc failure.
168 if (!pkey->ameth->pub_decode(pkey, key)) {
169 X509err(X509_F_X509_PUBKEY_DECODE, X509_R_PUBLIC_KEY_DECODE_ERROR);
173 X509err(X509_F_X509_PUBKEY_DECODE, X509_R_METHOD_NOT_SUPPORTED);
185 EVP_PKEY *X509_PUBKEY_get0(X509_PUBKEY *key)
187 EVP_PKEY *ret = NULL;
189 if (key == NULL || key->public_key == NULL)
192 if (key->pkey != NULL)
196 * When the key ASN.1 is initially parsed an attempt is made to
197 * decode the public key and cache the EVP_PKEY structure. If this
198 * operation fails the cached value will be NULL. Parsing continues
199 * to allow parsing of unknown key types or unsupported forms.
200 * We repeat the decode operation so the appropriate errors are left
203 x509_pubkey_decode(&ret, key);
204 /* If decode doesn't fail something bad happened */
206 X509err(X509_F_X509_PUBKEY_GET0, ERR_R_INTERNAL_ERROR);
213 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
215 EVP_PKEY *ret = X509_PUBKEY_get0(key);
217 EVP_PKEY_up_ref(ret);
222 * Now two pseudo ASN1 routines that take an EVP_PKEY structure and encode or
223 * decode as X509_PUBKEY
226 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length)
230 const unsigned char *q;
233 xpk = d2i_X509_PUBKEY(NULL, &q, length);
236 pktmp = X509_PUBKEY_get(xpk);
237 X509_PUBKEY_free(xpk);
248 int i2d_PUBKEY(const EVP_PKEY *a, unsigned char **pp)
250 X509_PUBKEY *xpk = NULL;
255 if ((xpk = X509_PUBKEY_new()) == NULL)
257 if (a->ameth != NULL && a->ameth->pub_encode != NULL
258 && !a->ameth->pub_encode(xpk, a))
260 xpk->pkey = (EVP_PKEY *)a;
261 ret = i2d_X509_PUBKEY(xpk, pp);
264 X509_PUBKEY_free(xpk);
269 * The following are equivalents but which return RSA and DSA keys
271 #ifndef OPENSSL_NO_RSA
272 RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length)
276 const unsigned char *q;
279 pkey = d2i_PUBKEY(NULL, &q, length);
282 key = EVP_PKEY_get1_RSA(pkey);
294 int i2d_RSA_PUBKEY(const RSA *a, unsigned char **pp)
300 pktmp = EVP_PKEY_new();
302 ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
305 (void)EVP_PKEY_assign_RSA(pktmp, (RSA *)a);
306 ret = i2d_PUBKEY(pktmp, pp);
307 pktmp->pkey.ptr = NULL;
308 EVP_PKEY_free(pktmp);
313 #ifndef OPENSSL_NO_DSA
314 DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length)
318 const unsigned char *q;
321 pkey = d2i_PUBKEY(NULL, &q, length);
324 key = EVP_PKEY_get1_DSA(pkey);
336 int i2d_DSA_PUBKEY(const DSA *a, unsigned char **pp)
342 pktmp = EVP_PKEY_new();
344 ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
347 (void)EVP_PKEY_assign_DSA(pktmp, (DSA *)a);
348 ret = i2d_PUBKEY(pktmp, pp);
349 pktmp->pkey.ptr = NULL;
350 EVP_PKEY_free(pktmp);
355 #ifndef OPENSSL_NO_EC
356 EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
360 const unsigned char *q;
363 pkey = d2i_PUBKEY(NULL, &q, length);
366 key = EVP_PKEY_get1_EC_KEY(pkey);
378 int i2d_EC_PUBKEY(const EC_KEY *a, unsigned char **pp)
385 if ((pktmp = EVP_PKEY_new()) == NULL) {
386 ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
389 (void)EVP_PKEY_assign_EC_KEY(pktmp, (EC_KEY *)a);
390 ret = i2d_PUBKEY(pktmp, pp);
391 pktmp->pkey.ptr = NULL;
392 EVP_PKEY_free(pktmp);
397 int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
398 int ptype, void *pval,
399 unsigned char *penc, int penclen)
401 if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
404 OPENSSL_free(pub->public_key->data);
405 pub->public_key->data = penc;
406 pub->public_key->length = penclen;
407 /* Set number of unused bits to zero */
408 pub->public_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
409 pub->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;
414 int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
415 const unsigned char **pk, int *ppklen,
416 X509_ALGOR **pa, X509_PUBKEY *pub)
419 *ppkalg = pub->algor->algorithm;
421 *pk = pub->public_key->data;
422 *ppklen = pub->public_key->length;
429 ASN1_BIT_STRING *X509_get0_pubkey_bitstr(const X509 *x)
433 return x->cert_info.key->public_key;