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openssl/crypto/engine/tb_asnmth.c

Index: openssl/crypto/engine/tb_asnmth.c
===================================================================
--- openssl/crypto/engine/tb_asnmth.c	(revision 0)
+++ openssl/crypto/engine/tb_asnmth.c	(revision 0)
@@ -0,0 +1,246 @@
+/* ====================================================================
+ * Copyright (c) 2006 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 "eng_int.h"
+#include "asn1_locl.h"
+#include <openssl/evp.h>
+
+/* If this symbol is defined then ENGINE_get_pkey_asn1_meth_engine(), the
+ * function that is used by EVP to hook in pkey_asn1_meth code and cache
+ * defaults (etc), will display brief debugging summaries to stderr with the
+ * 'nid'. */
+/* #define ENGINE_PKEY_ASN1_METH_DEBUG */
+
+static ENGINE_TABLE *pkey_asn1_meth_table = NULL;
+
+void ENGINE_unregister_pkey_asn1_meths(ENGINE *e)
+	{
+	engine_table_unregister(&pkey_asn1_meth_table, e);
+	}
+
+static void engine_unregister_all_pkey_asn1_meths(void)
+	{
+	engine_table_cleanup(&pkey_asn1_meth_table);
+	}
+
+int ENGINE_register_pkey_asn1_meths(ENGINE *e)
+	{
+	if(e->pkey_asn1_meths)
+		{
+		const int *nids;
+		int num_nids = e->pkey_asn1_meths(e, NULL, &nids, 0);
+		if(num_nids > 0)
+			return engine_table_register(&pkey_asn1_meth_table,
+				engine_unregister_all_pkey_asn1_meths, e, nids,
+					num_nids, 0);
+		}
+	return 1;
+	}
+
+void ENGINE_register_all_pkey_asn1_meths(void)
+	{
+	ENGINE *e;
+
+	for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))
+		ENGINE_register_pkey_asn1_meths(e);
+	}
+
+int ENGINE_set_default_pkey_asn1_meths(ENGINE *e)
+	{
+	if(e->pkey_asn1_meths)
+		{
+		const int *nids;
+		int num_nids = e->pkey_asn1_meths(e, NULL, &nids, 0);
+		if(num_nids > 0)
+			return engine_table_register(&pkey_asn1_meth_table,
+				engine_unregister_all_pkey_asn1_meths, e, nids,
+					num_nids, 1);
+		}
+	return 1;
+	}
+
+/* Exposed API function to get a functional reference from the implementation
+ * table (ie. try to get a functional reference from the tabled structural
+ * references) for a given pkey_asn1_meth 'nid' */
+ENGINE *ENGINE_get_pkey_asn1_meth_engine(int nid)
+	{
+	return engine_table_select(&pkey_asn1_meth_table, nid);
+	}
+
+/* Obtains a pkey_asn1_meth implementation from an ENGINE functional reference */
+const EVP_PKEY_ASN1_METHOD *ENGINE_get_pkey_asn1_meth(ENGINE *e, int nid)
+	{
+	EVP_PKEY_ASN1_METHOD *ret;
+	ENGINE_PKEY_ASN1_METHS_PTR fn = ENGINE_get_pkey_asn1_meths(e);
+	if(!fn || !fn(e, &ret, NULL, nid))
+		{
+		ENGINEerr(ENGINE_F_ENGINE_GET_PKEY_ASN1_METH,
+				ENGINE_R_UNIMPLEMENTED_PUBLIC_KEY_METHOD);
+		return NULL;
+		}
+	return ret;
+	}
+
+/* Gets the pkey_asn1_meth callback from an ENGINE structure */
+ENGINE_PKEY_ASN1_METHS_PTR ENGINE_get_pkey_asn1_meths(const ENGINE *e)
+	{
+	return e->pkey_asn1_meths;
+	}
+
+/* Sets the pkey_asn1_meth callback in an ENGINE structure */
+int ENGINE_set_pkey_asn1_meths(ENGINE *e, ENGINE_PKEY_ASN1_METHS_PTR f)
+	{
+	e->pkey_asn1_meths = f;
+	return 1;
+	}
+
+/* Internal function to free up EVP_PKEY_ASN1_METHOD structures before an
+ * ENGINE is destroyed
+ */
+
+void engine_pkey_asn1_meths_free(ENGINE *e)
+	{
+	int i;
+	EVP_PKEY_ASN1_METHOD *pkm;
+	if (e->pkey_asn1_meths)
+		{
+		const int *pknids;
+		int npknids;
+		npknids = e->pkey_asn1_meths(e, NULL, &pknids, 0);
+		for (i = 0; i < npknids; i++)
+			{
+			if (e->pkey_asn1_meths(e, &pkm, NULL, pknids[i]))
+				{
+				EVP_PKEY_asn1_free(pkm);
+				}
+			}
+		}
+	}
+
+/* Find a method based on a string. This does a linear search through
+ * all implemented algorithms. This is OK in practice because only
+ * a small number of algorithms are likely to be implemented in an engine
+ * and it is not used for speed critical operations.
+ */
+
+const EVP_PKEY_ASN1_METHOD *ENGINE_get_pkey_asn1_meth_str(ENGINE *e,
+					const char *str, int len)
+	{
+	int i, nidcount;
+	const int *nids;
+	EVP_PKEY_ASN1_METHOD *ameth;
+	if (!e->pkey_asn1_meths)
+		return NULL;
+	if (len == -1)
+		len = strlen(str);
+	nidcount = e->pkey_asn1_meths(e, NULL, &nids, 0);
+	for (i = 0; i < nidcount; i++)
+		{
+		e->pkey_asn1_meths(e, &ameth, NULL, nids[i]);
+		if (((int)strlen(ameth->pem_str) == len) && 
+					!strncasecmp(ameth->pem_str, str, len))
+			return ameth;
+		}
+	return NULL;
+	}
+
+typedef struct 
+	{
+	ENGINE *e;
+	const EVP_PKEY_ASN1_METHOD *ameth;
+	const char *str;
+	int len;
+	} ENGINE_FIND_STR;
+
+static void look_str_cb(int nid, STACK_OF(ENGINE) *sk, ENGINE *def, void *arg)
+	{
+	ENGINE_FIND_STR *lk = arg;
+	int i;
+	if (lk->ameth)
+		return;
+	for (i = 0; i < sk_ENGINE_num(sk); i++)
+		{
+		ENGINE *e = sk_ENGINE_value(sk, i);
+		EVP_PKEY_ASN1_METHOD *ameth;
+		e->pkey_asn1_meths(e, &ameth, NULL, nid);
+		if (((int)strlen(ameth->pem_str) == lk->len) && 
+				!strncasecmp(ameth->pem_str, lk->str, lk->len))
+			{
+			lk->e = e;
+			lk->ameth = ameth;
+			return;
+			}
+		}
+	}
+
+const EVP_PKEY_ASN1_METHOD *ENGINE_pkey_asn1_find_str(ENGINE **pe,
+					const char *str, int len)
+	{
+	ENGINE_FIND_STR fstr;
+	fstr.e = NULL;
+	fstr.ameth = NULL;
+	fstr.str = str;
+	fstr.len = len;
+	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
+	engine_table_doall(pkey_asn1_meth_table, look_str_cb, &fstr);
+	/* If found obtain a structural reference to engine */
+	if (fstr.e)
+		{
+		fstr.e->struct_ref++;
+		engine_ref_debug(fstr.e, 0, 1)
+		}
+	*pe = fstr.e;
+	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+	return fstr.ameth;
+	}