Initial support for pluggable public key ASN1 support. Process most public

key ASN1 handling through a single EVP_PKEY_ASN1_METHOD structure and move
the spaghetti algorithm specific code to a single ASN1 module for each
algorithm.

1 files changed, 360 insertions, 0 deletions

diff --git a/crypto/ec/ec_ameth.c b/crypto/ec/ec_ameth.c
new file mode 100644
index 0000000000..11aa432d33
--- /dev/null
+++ b/crypto/ec/ec_ameth.c
@@ -0,0 +1,360 @@
+/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
+ * project 2006.
+ */
+/* ====================================================================
+ * Copyright (c) 2005 The OpenSSL Project.  All rights reserved.
+ *
+ * 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 above 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 acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED 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 OpenSSL PROJECT OR
+ * ITS 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.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+#include <stdio.h>
+#include "cryptlib.h"
+#include <openssl/x509.h>
+#include <openssl/ec.h>
+
+static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key)
+	{
+	const EC_GROUP  *group;
+	int nid;
+	if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL) 
+	{
+		ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS);
+		return 0;
+	}
+	if (EC_GROUP_get_asn1_flag(group)
+                     && (nid = EC_GROUP_get_curve_name(group)))
+		/* we have a 'named curve' => just set the OID */
+		{
+		*ppval = OBJ_nid2obj(nid);
+		*pptype = V_ASN1_OBJECT;
+		}
+	else	/* explicit parameters */
+		{
+		ASN1_STRING *pstr = NULL;
+		pstr = ASN1_STRING_new();
+		if (!pstr)
+			return 0;
+		pstr->length = i2d_ECParameters(ec_key, &pstr->data);
+		if (pstr->length < 0)
+			{
+			ASN1_STRING_free(pstr);
+			ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB);
+			return 0;
+			}
+		*ppval = pstr;
+		*pptype = V_ASN1_SEQUENCE;
+		}
+	return 1;
+	}
+
+static int eckey_pub_encode(X509_PUBKEY *pk, EVP_PKEY *pkey)
+	{
+	EC_KEY *ec_key = pkey->pkey.ec;
+	void *pval = NULL;
+	int ptype;
+	unsigned char *penc = NULL, *p;
+	int penclen;
+
+	if (!eckey_param2type(&ptype, &pval, ec_key))
+		{
+		ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB);
+		return 0;
+		}
+	penclen = i2o_ECPublicKey(ec_key, NULL);
+	if (penclen <= 0)
+		goto err;
+	penc = OPENSSL_malloc(penclen);
+	if (!penc)
+		goto err;
+	p = penc;
+	penclen = i2o_ECPublicKey(ec_key, &p);
+	if (penclen <= 0)
+		goto err;
+	if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
+				ptype, pval, penc, penclen))
+		return 1;
+	err:
+	if (ptype == V_ASN1_OBJECT)
+		ASN1_OBJECT_free(pval);
+	else
+		ASN1_STRING_free(pval);
+	if (penc)
+		OPENSSL_free(penc);
+	return 0;
+	}
+
+static EC_KEY *eckey_type2param(int ptype, void *pval)
+	{
+	EC_KEY *eckey = NULL;
+	if (ptype == V_ASN1_SEQUENCE)
+		{
+		ASN1_STRING *pstr = pval;
+		const unsigned char *pm = NULL;
+		int pmlen;
+		pm = pstr->data;
+		pmlen = pstr->length;
+		if (!(eckey = d2i_ECParameters(NULL, &pm, pmlen)))
+			{
+			ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
+			goto ecerr;
+			}
+		}
+	else if (ptype == V_ASN1_OBJECT)
+		{
+		ASN1_OBJECT *poid = pval;
+		EC_GROUP *group;
+
+		/* type == V_ASN1_OBJECT => the parameters are given
+		 * by an asn1 OID
+		 */
+		if ((eckey = EC_KEY_new()) == NULL)
+			{
+			ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
+			goto ecerr;
+			}
+		group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
+		if (group == NULL)
+			goto ecerr;
+		EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
+		if (EC_KEY_set_group(eckey, group) == 0)
+			goto ecerr;
+		EC_GROUP_free(group);
+		}
+	else
+		{
+		ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
+		goto ecerr;
+		}
+
+	return eckey;
+
+	ecerr:
+	if (eckey)
+		EC_KEY_free(eckey);
+	return NULL;
+	}
+
+static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
+	{
+	const unsigned char *p = NULL;
+	void *pval;
+	int ptype, pklen;
+	EC_KEY *eckey = NULL;
+	X509_ALGOR *palg;
+
+	if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
+		return 0;
+	X509_ALGOR_get0(NULL, &ptype, &pval, palg);
+
+	eckey = eckey_type2param(ptype, pval);
+
+	if (!eckey)
+		{
+		ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
+		return 0;
+		}
+
+	/* We have parameters now set public key */
+	if (!o2i_ECPublicKey(&eckey, &p, pklen))
+		{
+		ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
+		goto ecerr;
+		}
+
+	EVP_PKEY_assign_EC_KEY(pkey, eckey);
+	return 1;
+
+	ecerr:
+	if (eckey)
+		EC_KEY_free(eckey);
+	return 0;
+	}
+
+static int eckey_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
+	{
+	const unsigned char *p = NULL;
+	void *pval;
+	int ptype, pklen;
+	EC_KEY *eckey = NULL;
+	X509_ALGOR *palg;
+
+	if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
+		return 0;
+	X509_ALGOR_get0(NULL, &ptype, &pval, palg);
+
+	eckey = eckey_type2param(ptype, pval);
+
+	if (!eckey)
+		goto ecliberr;
+
+	/* We have parameters now set private key */
+	if (!d2i_ECPrivateKey(&eckey, &p, pklen))
+		{
+		ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
+		goto ecerr;
+		}
+
+	/* calculate public key (if necessary) */
+	if (EC_KEY_get0_public_key(eckey) == NULL)
+		{
+		const BIGNUM *priv_key;
+		const EC_GROUP *group;
+		EC_POINT *pub_key;
+		/* the public key was not included in the SEC1 private
+		 * key => calculate the public key */
+		group   = EC_KEY_get0_group(eckey);
+		pub_key = EC_POINT_new(group);
+		if (pub_key == NULL)
+			{
+			ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
+			goto ecliberr;
+			}
+		if (!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group)))
+			{
+			EC_POINT_free(pub_key);
+			ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
+			goto ecliberr;
+			}
+		priv_key = EC_KEY_get0_private_key(eckey);
+		if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, NULL))
+			{
+			EC_POINT_free(pub_key);
+			ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
+			goto ecliberr;
+			}
+		if (EC_KEY_set_public_key(eckey, pub_key) == 0)
+			{
+			EC_POINT_free(pub_key);
+			ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
+			goto ecliberr;
+			}
+		EC_POINT_free(pub_key);
+		}
+
+	EVP_PKEY_assign_EC_KEY(pkey, eckey);
+	return 1;
+
+	ecliberr:
+	ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
+	ecerr:
+	if (eckey)
+		EC_KEY_free(eckey);
+	return 0;
+	}
+
+static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, EVP_PKEY *pkey)
+{
+	EC_KEY		*ec_key;
+	unsigned char	*ep, *p;
+	int 		eplen, ptype;
+	void		*pval;
+	unsigned int    tmp_flags, old_flags;
+
+	ec_key = pkey->pkey.ec;
+
+	if (!eckey_param2type(&ptype, &pval, ec_key))
+		{
+		ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
+		return 0;
+		}
+
+	/* set the private key */
+
+	/* do not include the parameters in the SEC1 private key
+	 * see PKCS#11 12.11 */
+	old_flags = EC_KEY_get_enc_flags(ec_key);
+	tmp_flags = old_flags | EC_PKEY_NO_PARAMETERS;
+	EC_KEY_set_enc_flags(ec_key, tmp_flags);
+	eplen = i2d_ECPrivateKey(ec_key, NULL);
+	if (!eplen)
+	{
+		EC_KEY_set_enc_flags(ec_key, old_flags);
+		ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
+		return 0;
+	}
+	ep = (unsigned char *) OPENSSL_malloc(eplen);
+	if (!ep)
+	{
+		EC_KEY_set_enc_flags(ec_key, old_flags);
+		ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
+		return 0;
+	}
+	p = ep;
+	if (!i2d_ECPrivateKey(ec_key, &p))
+	{
+		EC_KEY_set_enc_flags(ec_key, old_flags);
+		OPENSSL_free(ep);
+		ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
+	}
+	/* restore old encoding flags */
+	EC_KEY_set_enc_flags(ec_key, old_flags);
+
+	if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
+				ptype, pval, ep, eplen))
+		return 0;
+
+	return 1;
+}
+
+EVP_PKEY_ASN1_METHOD eckey_asn1_meth = 
+	{
+	EVP_PKEY_EC,
+	0,
+	0,
+	eckey_pub_decode,
+	eckey_pub_encode,
+	0,
+	eckey_priv_decode,
+	eckey_priv_encode,
+	0,
+	0,
+	0
+	};