Insulate the legacy Android client auth code from OpenSSL ABI changes.

net/android/legacy_openssl.h

Index: net/android/legacy_openssl.h
diff --git a/net/android/legacy_openssl.h b/net/android/legacy_openssl.h
new file mode 100644
index 0000000000000000000000000000000000000000..e87413570ee58d6cf6038c1e18da46def8c374ab
--- /dev/null
+++ b/net/android/legacy_openssl.h
@@ -0,0 +1,98 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_ANDROID_LEGACY_OPENSSL_H
+#define NET_ANDROID_LEGACY_OPENSSL_H
+
+// This file contains a replica of the Android system OpenSSL ABI shipped in
+// Android 4.1.x (API level 16). The ABI may not necessarily be compatible with
+// the copy of OpenSSL shipped in Chromium. This is used to implement
+// RSA_private_encrypt in one of the legacy client auth codepaths.
+//
+// See https://android.googlesource.com/platform/external/openssl/+/android-4.1.2_r2.1
+
+namespace net {
+namespace android {
+
+enum {
+  ANDROID_EVP_PKEY_RSA = 6,
+};
+
+enum {
+  ANDROID_RSA_PKCS1_PADDING = 1,
+  ANDROID_RSA_SSLV23_PADDING = 2,
+  ANDROID_RSA_NO_PADDING = 3,
+  ANDROID_RSA_PKCS1_OAEP_PADDING = 4,
+  ANDROID_X931_PADDING = 5,
+  ANDROID_PKCS1_PSS_PADDING = 6,
+};
+
+struct AndroidEVP_PKEY_ASN1_METHOD;
+struct AndroidRSA_METHOD;
+struct AndroidSTACK;
+
+struct AndroidCRYPTO_EX_DATA {
+  AndroidSTACK* sk;
+  int dummy;
+};
+
+struct AndroidENGINE {
+  const char* id;
+  // Remaining fields intentionally omitted.
+};
+
+struct AndroidRSA {
+  int pad;
+  long version;
+  const AndroidRSA_METHOD* meth;
+  AndroidENGINE* engine;
+  // Remaining fields intentionally omitted.
+};
+
+struct AndroidRSA_METHOD {
+  const char* name;
+  int (*rsa_pub_enc)(int flen,
+                     const unsigned char* from,
+                     unsigned char* to,
+                     AndroidRSA* rsa,
+                     int padding);
+  int (*rsa_pub_dec)(int flen,
+                     const unsigned char* from,
+                     unsigned char* to,
+                     AndroidRSA* rsa,
+                     int padding);
+  int (*rsa_priv_enc)(int flen,
+                      const unsigned char* from,
+                      unsigned char* to,
+                      AndroidRSA* rsa,
+                      int padding);
+  int (*rsa_priv_dec)(int flen,
+                      const unsigned char* from,
+                      unsigned char* to,
+                      AndroidRSA* rsa,
+                      int padding);
+  // Remaining fields intentionally omitted.
+};
+
+struct AndroidEVP_PKEY {
+  int type;
+  int save_type;
+  // Note: this value must NOT be modified using Chromium's CRYPTO_add
+  // function. That may not necessarily use the same locking implementation as
+  // system OpenSSL.
+  int references;
+  const AndroidEVP_PKEY_ASN1_METHOD* ameth;
+  AndroidENGINE* engine;
+  union {
+    char* ptr;
+    AndroidRSA* rsa;
+  } pkey;
+  int save_parameters;
+  AndroidSTACK* attributes;
+};
+
+}  // namespace android
+}  // namespace net
+
+#endif  // NET_ANDROID_LEGACY_OPENSSL_H