Imported Upstream version 4.8.0.309

Former-commit-id: 5f9c6ae75f295e057a7d2971f3a6df4656fa8850

external/boringssl/crypto/obj/obj_xref.c

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+/* 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/obj.h>
+
+#include <stdlib.h>
+
+#include "obj_xref.h"
+
+
+static int nid_triple_cmp_by_sign_id(const void *in_a, const void *in_b) {
+  const nid_triple *a = in_a;
+  const nid_triple *b = in_b;
+
+  return a->sign_id - b->sign_id;
+}
+
+int OBJ_find_sigid_algs(int sign_nid, int *out_digest_nid, int *out_pkey_nid) {
+  nid_triple key;
+  const nid_triple *triple;
+
+  key.sign_id = sign_nid;
+
+  triple = bsearch(&key, sigoid_srt, sizeof(sigoid_srt) / sizeof(nid_triple),
+                   sizeof(nid_triple), nid_triple_cmp_by_sign_id);
+
+  if (triple == NULL) {
+    return 0;
+  }
+  if (out_digest_nid) {
+    *out_digest_nid = triple->hash_id;
+  }
+  if (out_pkey_nid) {
+    *out_pkey_nid = triple->pkey_id;
+  }
+
+  return 1;
+}
+
+static int nid_triple_cmp_by_digest_and_hash(const void *in_a,
+                                             const void *in_b) {
+  const nid_triple *a = *((nid_triple**) in_a);
+  const nid_triple *b = *((nid_triple**) in_b);
+
+  int ret = a->hash_id - b->hash_id;
+  if (ret) {
+    return ret;
+  }
+  return a->pkey_id - b->pkey_id;
+}
+
+int OBJ_find_sigid_by_algs(int *out_sign_nid, int digest_nid, int pkey_nid) {
+  nid_triple key, *pkey;
+  const nid_triple **triple;
+
+  key.hash_id = digest_nid;
+  key.pkey_id = pkey_nid;
+  pkey = &key;
+
+  triple = bsearch(&pkey, sigoid_srt_xref,
+                   sizeof(sigoid_srt_xref) / sizeof(nid_triple *),
+                   sizeof(nid_triple *), nid_triple_cmp_by_digest_and_hash);
+
+  if (triple == NULL) {
+    return 0;
+  }
+  if (out_sign_nid) {
+    *out_sign_nid = (*triple)->sign_id;
+  }
+  return 1;
+}