Revert "Move webrtc/{base => rtc_base}" (https://codereview.webrtc.org/2877023002)

Will reland in two different commits to preserve git blame history.

BUG=webrtc:7634
NOTRY=True
TBR=kwiberg@webrtc.org

Change-Id: I550da8525aeb9c5b8f96338fcf1c9714f3dcdab1
Reviewed-on: https://chromium-review.googlesource.com/554610
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#18820}
diff --git a/webrtc/base/opensslidentity.h b/webrtc/base/opensslidentity.h
index 59fa571..84716d1 100644
--- a/webrtc/base/opensslidentity.h
+++ b/webrtc/base/opensslidentity.h
@@ -11,9 +11,137 @@
 #ifndef WEBRTC_BASE_OPENSSLIDENTITY_H_
 #define WEBRTC_BASE_OPENSSLIDENTITY_H_
 
+#include <openssl/evp.h>
+#include <openssl/x509.h>
 
-// This header is deprecated and is just left here temporarily during
-// refactoring. See https://bugs.webrtc.org/7634 for more details.
-#include "webrtc/rtc_base/opensslidentity.h"
+#include <memory>
+#include <string>
+
+#include "webrtc/base/checks.h"
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/base/sslidentity.h"
+
+typedef struct ssl_ctx_st SSL_CTX;
+
+namespace rtc {
+
+// OpenSSLKeyPair encapsulates an OpenSSL EVP_PKEY* keypair object,
+// which is reference counted inside the OpenSSL library.
+class OpenSSLKeyPair {
+ public:
+  explicit OpenSSLKeyPair(EVP_PKEY* pkey) : pkey_(pkey) {
+    RTC_DCHECK(pkey_ != nullptr);
+  }
+
+  static OpenSSLKeyPair* Generate(const KeyParams& key_params);
+  // Constructs a key pair from the private key PEM string. This must not result
+  // in missing public key parameters. Returns null on error.
+  static OpenSSLKeyPair* FromPrivateKeyPEMString(
+      const std::string& pem_string);
+
+  virtual ~OpenSSLKeyPair();
+
+  virtual OpenSSLKeyPair* GetReference();
+
+  EVP_PKEY* pkey() const { return pkey_; }
+  std::string PrivateKeyToPEMString() const;
+  std::string PublicKeyToPEMString() const;
+  bool operator==(const OpenSSLKeyPair& other) const;
+  bool operator!=(const OpenSSLKeyPair& other) const;
+
+ private:
+  void AddReference();
+
+  EVP_PKEY* pkey_;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(OpenSSLKeyPair);
+};
+
+// OpenSSLCertificate encapsulates an OpenSSL X509* certificate object,
+// which is also reference counted inside the OpenSSL library.
+class OpenSSLCertificate : public SSLCertificate {
+ public:
+  // Caller retains ownership of the X509 object.
+  explicit OpenSSLCertificate(X509* x509) : x509_(x509) {
+    AddReference();
+  }
+
+  static OpenSSLCertificate* Generate(OpenSSLKeyPair* key_pair,
+                                      const SSLIdentityParams& params);
+  static OpenSSLCertificate* FromPEMString(const std::string& pem_string);
+
+  ~OpenSSLCertificate() override;
+
+  OpenSSLCertificate* GetReference() const override;
+
+  X509* x509() const { return x509_; }
+
+  std::string ToPEMString() const override;
+  void ToDER(Buffer* der_buffer) const override;
+  bool operator==(const OpenSSLCertificate& other) const;
+  bool operator!=(const OpenSSLCertificate& other) const;
+
+  // Compute the digest of the certificate given algorithm
+  bool ComputeDigest(const std::string& algorithm,
+                     unsigned char* digest,
+                     size_t size,
+                     size_t* length) const override;
+
+  // Compute the digest of a certificate as an X509 *
+  static bool ComputeDigest(const X509* x509,
+                            const std::string& algorithm,
+                            unsigned char* digest,
+                            size_t size,
+                            size_t* length);
+
+  bool GetSignatureDigestAlgorithm(std::string* algorithm) const override;
+  std::unique_ptr<SSLCertChain> GetChain() const override;
+
+  int64_t CertificateExpirationTime() const override;
+
+ private:
+  void AddReference() const;
+
+  X509* x509_;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(OpenSSLCertificate);
+};
+
+// Holds a keypair and certificate together, and a method to generate
+// them consistently.
+class OpenSSLIdentity : public SSLIdentity {
+ public:
+  static OpenSSLIdentity* GenerateWithExpiration(const std::string& common_name,
+                                                 const KeyParams& key_params,
+                                                 time_t certificate_lifetime);
+  static OpenSSLIdentity* GenerateForTest(const SSLIdentityParams& params);
+  static SSLIdentity* FromPEMStrings(const std::string& private_key,
+                                     const std::string& certificate);
+  ~OpenSSLIdentity() override;
+
+  const OpenSSLCertificate& certificate() const override;
+  OpenSSLIdentity* GetReference() const override;
+
+  // Configure an SSL context object to use our key and certificate.
+  bool ConfigureIdentity(SSL_CTX* ctx);
+
+  std::string PrivateKeyToPEMString() const override;
+  std::string PublicKeyToPEMString() const override;
+  bool operator==(const OpenSSLIdentity& other) const;
+  bool operator!=(const OpenSSLIdentity& other) const;
+
+ private:
+  OpenSSLIdentity(OpenSSLKeyPair* key_pair, OpenSSLCertificate* certificate);
+
+  static OpenSSLIdentity* GenerateInternal(const SSLIdentityParams& params);
+
+  std::unique_ptr<OpenSSLKeyPair> key_pair_;
+  std::unique_ptr<OpenSSLCertificate> certificate_;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(OpenSSLIdentity);
+};
+
+
+}  // namespace rtc
 
 #endif  // WEBRTC_BASE_OPENSSLIDENTITY_H_