crypto/x509/x_pubkey.c

/* 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/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
#include <openssl/thread.h>
#include <openssl/x509.h>

#include "../evp/internal.h"
#include "../internal.h"


/* Minor tweak to operation: free up EVP_PKEY */
static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
			void *exarg)
	{
	if (operation == ASN1_OP_FREE_POST)
		{
		X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
		EVP_PKEY_free(pubkey->pkey);
		}
	return 1;
	}

ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
	ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
	ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
} ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)

IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)

int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
	{
	X509_PUBKEY *pk=NULL;

	if (x == NULL) return(0);

	if ((pk=X509_PUBKEY_new()) == NULL) goto error;

	if (pkey->ameth)
		{
		if (pkey->ameth->pub_encode)
			{
			if (!pkey->ameth->pub_encode(pk, pkey))
				{
				OPENSSL_PUT_ERROR(X509, X509_PUBKEY_set, X509_R_PUBLIC_KEY_ENCODE_ERROR);
				goto error;
				}
			}
		else
			{
			OPENSSL_PUT_ERROR(X509, X509_PUBKEY_set, X509_R_METHOD_NOT_SUPPORTED);
			goto error;
			}
		}
	else
		{
		OPENSSL_PUT_ERROR(X509, X509_PUBKEY_set, X509_R_UNSUPPORTED_ALGORITHM);
		goto error;
		}

	if (*x != NULL)
		X509_PUBKEY_free(*x);

	*x=pk;

	return 1;
error:
	if (pk != NULL) X509_PUBKEY_free(pk);
	return 0;
	}

/* g_pubkey_lock is used to protect the initialisation of the |pkey| member of
 * |X509_PUBKEY| objects. Really |X509_PUBKEY| should have a |CRYPTO_once_t|
 * inside it for this, but |CRYPTO_once_t| is private and |X509_PUBKEY| is
 * not. */
static struct CRYPTO_STATIC_MUTEX g_pubkey_lock = CRYPTO_STATIC_MUTEX_INIT;

EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
	{
	EVP_PKEY *ret=NULL;

	if (key == NULL) goto error;

	CRYPTO_STATIC_MUTEX_lock_read(&g_pubkey_lock);
	if (key->pkey != NULL)
		{
		CRYPTO_STATIC_MUTEX_unlock(&g_pubkey_lock);
		return EVP_PKEY_up_ref(key->pkey);
		}
	CRYPTO_STATIC_MUTEX_unlock(&g_pubkey_lock);

	if (key->public_key == NULL) goto error;

	if ((ret = EVP_PKEY_new()) == NULL)
		{
		OPENSSL_PUT_ERROR(X509, X509_PUBKEY_get, ERR_R_MALLOC_FAILURE);
		goto error;
		}

	if (!EVP_PKEY_set_type(ret, OBJ_obj2nid(key->algor->algorithm)))
		{
		OPENSSL_PUT_ERROR(X509, X509_PUBKEY_get, X509_R_UNSUPPORTED_ALGORITHM);
		goto error;
		}

	if (ret->ameth->pub_decode)
		{
		if (!ret->ameth->pub_decode(ret, key))
			{
			OPENSSL_PUT_ERROR(X509, X509_PUBKEY_get, X509_R_PUBLIC_KEY_DECODE_ERROR);
			goto error;
			}
		}
	else
		{
		OPENSSL_PUT_ERROR(X509, X509_PUBKEY_get, X509_R_METHOD_NOT_SUPPORTED);
		goto error;
		}

	/* Check to see if another thread set key->pkey first */
	CRYPTO_STATIC_MUTEX_lock_write(&g_pubkey_lock);
	if (key->pkey)
		{
		CRYPTO_STATIC_MUTEX_unlock(&g_pubkey_lock);
		EVP_PKEY_free(ret);
		ret = key->pkey;
		}
	else
		{
		key->pkey = ret;
		CRYPTO_STATIC_MUTEX_unlock(&g_pubkey_lock);
		}

	return EVP_PKEY_up_ref(ret);

	error:
	if (ret != NULL)
		EVP_PKEY_free(ret);
	return(NULL);
	}

/* Now two pseudo ASN1 routines that take an EVP_PKEY structure
 * and encode or decode as X509_PUBKEY
 */

EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp,
	     long length)
	{
	X509_PUBKEY *xpk;
	EVP_PKEY *pktmp;
	xpk = d2i_X509_PUBKEY(NULL, pp, length);
	if(!xpk) return NULL;
	pktmp = X509_PUBKEY_get(xpk);
	X509_PUBKEY_free(xpk);
	if(!pktmp) return NULL;
	if(a)
		{
		EVP_PKEY_free(*a);
		*a = pktmp;
		}
	return pktmp;
	}

int i2d_PUBKEY(const EVP_PKEY *a, unsigned char **pp)
	{
	X509_PUBKEY *xpk=NULL;
	int ret;
	if(!a) return 0;
	if(!X509_PUBKEY_set(&xpk, (EVP_PKEY*) a)) return 0;
	ret = i2d_X509_PUBKEY(xpk, pp);
	X509_PUBKEY_free(xpk);
	return ret;
	}

/* The following are equivalents but which return RSA and DSA
 * keys
 */
RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp,
	     long length)
	{
	EVP_PKEY *pkey;
	RSA *key;
	const unsigned char *q;
	q = *pp;
	pkey = d2i_PUBKEY(NULL, &q, length);
	if (!pkey) return NULL;
	key = EVP_PKEY_get1_RSA(pkey);
	EVP_PKEY_free(pkey);
	if (!key) return NULL;
	*pp = q;
	if (a)
		{
		RSA_free(*a);
		*a = key;
		}
	return key;
	}

int i2d_RSA_PUBKEY(const RSA *a, unsigned char **pp)
	{
	EVP_PKEY *pktmp;
	int ret;
	if (!a) return 0;
	pktmp = EVP_PKEY_new();
	if (!pktmp)
		{
		OPENSSL_PUT_ERROR(X509, i2d_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
		return 0;
		}
	EVP_PKEY_set1_RSA(pktmp, (RSA*) a);
	ret = i2d_PUBKEY(pktmp, pp);
	EVP_PKEY_free(pktmp);
	return ret;
	}

#ifndef OPENSSL_NO_DSA
DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp,
	     long length)
	{
	EVP_PKEY *pkey;
	DSA *key;
	const unsigned char *q;
	q = *pp;
	pkey = d2i_PUBKEY(NULL, &q, length);
	if (!pkey) return NULL;
	key = EVP_PKEY_get1_DSA(pkey);
	EVP_PKEY_free(pkey);
	if (!key) return NULL;
	*pp = q;
	if (a)
		{
		DSA_free(*a);
		*a = key;
		}
	return key;
	}

int i2d_DSA_PUBKEY(const DSA *a, unsigned char **pp)
	{
	EVP_PKEY *pktmp;
	int ret;
	if(!a) return 0;
	pktmp = EVP_PKEY_new();
	if(!pktmp)
		{
		OPENSSL_PUT_ERROR(X509, i2d_DSA_PUBKEY,  ERR_R_MALLOC_FAILURE);
		return 0;
		}
	EVP_PKEY_set1_DSA(pktmp, (DSA*) a);
	ret = i2d_PUBKEY(pktmp, pp);
	EVP_PKEY_free(pktmp);
	return ret;
	}
#endif

EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
	{
	EVP_PKEY *pkey;
	EC_KEY *key;
	const unsigned char *q;
	q = *pp;
	pkey = d2i_PUBKEY(NULL, &q, length);
	if (!pkey) return(NULL);
	key = EVP_PKEY_get1_EC_KEY(pkey);
	EVP_PKEY_free(pkey);
	if (!key)  return(NULL);
	*pp = q;
	if (a)
		{
		EC_KEY_free(*a);
		*a = key;
		}
	return(key);
	}

int i2d_EC_PUBKEY(const EC_KEY *a, unsigned char **pp)
	{
	EVP_PKEY *pktmp;
	int ret;
	if (!a)	return(0);
	if ((pktmp = EVP_PKEY_new()) == NULL)
		{
		OPENSSL_PUT_ERROR(X509, i2d_EC_PUBKEY,  ERR_R_MALLOC_FAILURE);
		return(0);
		}
	EVP_PKEY_set1_EC_KEY(pktmp, (EC_KEY*) a);
	ret = i2d_PUBKEY(pktmp, pp);
	EVP_PKEY_free(pktmp);
	return(ret);
	}

int X509_PUBKEY_set0_param(X509_PUBKEY *pub, const ASN1_OBJECT *aobj,
					int ptype, void *pval,
					unsigned char *penc, int penclen)
	{
	if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
		return 0;
	if (penc)
		{
		if (pub->public_key->data)
			OPENSSL_free(pub->public_key->data);
		pub->public_key->data = penc;
		pub->public_key->length = penclen;
  		/* Set number of unused bits to zero */
		pub->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
		pub->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
		}
	return 1;
	}

int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
		const unsigned char **pk, int *ppklen,
		X509_ALGOR **pa,
		X509_PUBKEY *pub)
	{
	if (ppkalg)
		*ppkalg = pub->algor->algorithm;
	if (pk)
		{
		*pk = pub->public_key->data;
		*ppklen = pub->public_key->length;
		}
	if (pa)
		*pa = pub->algor;
	return 1;
	}