diff --git a/adb/Android.mk b/adb/Android.mk
index 0114ca3..b4e10fc 100644
--- a/adb/Android.mk
+++ b/adb/Android.mk
@@ -45,7 +45,6 @@
 # get enough of adb in here that we no longer need minadb. https://b/17626262
 LIBADB_SRC_FILES := \
     adb.cpp \
-    adb_auth.cpp \
     adb_io.cpp \
     adb_listeners.cpp \
     adb_trace.cpp \
@@ -103,7 +102,7 @@
 LOCAL_CFLAGS := $(LIBADB_CFLAGS) -DADB_HOST=0
 LOCAL_SRC_FILES := \
     $(LIBADB_SRC_FILES) \
-    adb_auth_client.cpp \
+    adbd_auth.cpp \
     jdwp_service.cpp \
     usb_linux_client.cpp \
 
diff --git a/adb/adb.cpp b/adb/adb.cpp
index 9ae3f1c..89a20f0 100644
--- a/adb/adb.cpp
+++ b/adb/adb.cpp
@@ -351,19 +351,31 @@
         break;
 
     case A_AUTH:
-        if (p->msg.arg0 == ADB_AUTH_TOKEN) {
-            t->connection_state = kCsUnauthorized;
-            send_auth_response(p->data, p->msg.data_length, t);
-        } else if (p->msg.arg0 == ADB_AUTH_SIGNATURE) {
-            if (adb_auth_verify(t->token, sizeof(t->token), p->data, p->msg.data_length)) {
-                adb_auth_verified(t);
-                t->failed_auth_attempts = 0;
-            } else {
-                if (t->failed_auth_attempts++ > 256) adb_sleep_ms(1000);
-                send_auth_request(t);
-            }
-        } else if (p->msg.arg0 == ADB_AUTH_RSAPUBLICKEY) {
-            adb_auth_confirm_key(p->data, p->msg.data_length, t);
+        switch (p->msg.arg0) {
+#if ADB_HOST
+            case ADB_AUTH_TOKEN:
+                t->connection_state = kCsUnauthorized;
+                send_auth_response(p->data, p->msg.data_length, t);
+                break;
+#else
+            case ADB_AUTH_SIGNATURE:
+                if (adbd_auth_verify(t->token, sizeof(t->token), p->data, p->msg.data_length)) {
+                    adbd_auth_verified(t);
+                    t->failed_auth_attempts = 0;
+                } else {
+                    if (t->failed_auth_attempts++ > 256) adb_sleep_ms(1000);
+                    send_auth_request(t);
+                }
+                break;
+
+            case ADB_AUTH_RSAPUBLICKEY:
+                adbd_auth_confirm_key(p->data, p->msg.data_length, t);
+                break;
+#endif
+            default:
+                t->connection_state = kCsOffline;
+                handle_offline(t);
+                break;
         }
         break;
 
diff --git a/adb/adb_auth.cpp b/adb/adb_auth.cpp
deleted file mode 100644
index 0b07158..0000000
--- a/adb/adb_auth.cpp
+++ /dev/null
@@ -1,101 +0,0 @@
-/*
- * Copyright (C) 2015 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#define TRACE_TAG ADB
-
-#include "adb.h"
-#include "adb_auth.h"
-#include "transport.h"
-
-#include <errno.h>
-#include <stdio.h>
-#include <string.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-bool auth_required = true;
-
-void send_auth_request(atransport *t)
-{
-    LOG(INFO) << "Calling send_auth_request...";
-
-    if (!adb_auth_generate_token(t->token, sizeof(t->token))) {
-        PLOG(ERROR) << "Error generating token";
-        return;
-    }
-
-    apacket* p = get_apacket();
-    memcpy(p->data, t->token, sizeof(t->token));
-    p->msg.command = A_AUTH;
-    p->msg.arg0 = ADB_AUTH_TOKEN;
-    p->msg.data_length = sizeof(t->token);
-    send_packet(p, t);
-}
-
-static void send_auth_publickey(atransport* t) {
-    LOG(INFO) << "Calling send_auth_publickey";
-
-    std::string key = adb_auth_get_userkey();
-    if (key.empty()) {
-        D("Failed to get user public key");
-        return;
-    }
-
-    if (key.size() >= MAX_PAYLOAD_V1) {
-        D("User public key too large (%zu B)", key.size());
-        return;
-    }
-
-    apacket* p = get_apacket();
-    memcpy(p->data, key.c_str(), key.size() + 1);
-
-    p->msg.command = A_AUTH;
-    p->msg.arg0 = ADB_AUTH_RSAPUBLICKEY;
-
-    // adbd expects a null-terminated string.
-    p->msg.data_length = key.size() + 1;
-    send_packet(p, t);
-}
-
-void send_auth_response(uint8_t* token, size_t token_size, atransport* t) {
-    std::shared_ptr<RSA> key = t->NextKey();
-    if (key == nullptr) {
-        // No more private keys to try, send the public key.
-        send_auth_publickey(t);
-        return;
-    }
-
-    LOG(INFO) << "Calling send_auth_response";
-    apacket* p = get_apacket();
-
-    int ret = adb_auth_sign(key.get(), token, token_size, p->data);
-    if (!ret) {
-        D("Error signing the token");
-        put_apacket(p);
-        return;
-    }
-
-    p->msg.command = A_AUTH;
-    p->msg.arg0 = ADB_AUTH_SIGNATURE;
-    p->msg.data_length = ret;
-    send_packet(p, t);
-}
-
-void adb_auth_verified(atransport *t)
-{
-    handle_online(t);
-    send_connect(t);
-}
diff --git a/adb/adb_auth.h b/adb/adb_auth.h
index 59b80d8..4db83a4 100644
--- a/adb/adb_auth.h
+++ b/adb/adb_auth.h
@@ -24,14 +24,6 @@
 
 #include <openssl/rsa.h>
 
-extern bool auth_required;
-
-int adb_auth_keygen(const char* filename);
-void adb_auth_verified(atransport *t);
-
-void send_auth_request(atransport *t);
-void send_auth_response(uint8_t *token, size_t token_size, atransport *t);
-
 /* AUTH packets first argument */
 /* Request */
 #define ADB_AUTH_TOKEN         1
@@ -42,25 +34,26 @@
 #if ADB_HOST
 
 void adb_auth_init();
+
+int adb_auth_keygen(const char* filename);
 int adb_auth_sign(RSA* key, const unsigned char* token, size_t token_size, unsigned char* sig);
 std::string adb_auth_get_userkey();
 std::deque<std::shared_ptr<RSA>> adb_auth_get_private_keys();
 
-static inline bool adb_auth_generate_token(void*, size_t) { abort(); }
-static inline bool adb_auth_verify(void*, size_t, void*, int) { abort(); }
-static inline void adb_auth_confirm_key(unsigned char*, size_t, atransport*) { abort(); }
+void send_auth_response(uint8_t *token, size_t token_size, atransport *t);
 
 #else // !ADB_HOST
 
-static inline int adb_auth_sign(void*, const unsigned char*, size_t, unsigned char*) { abort(); }
-static inline std::string adb_auth_get_userkey() { abort(); }
-static inline std::deque<std::shared_ptr<RSA>> adb_auth_get_private_keys() { abort(); }
+extern bool auth_required;
 
 void adbd_auth_init(void);
+void adbd_auth_verified(atransport *t);
+
 void adbd_cloexec_auth_socket();
-bool adb_auth_generate_token(void* token, size_t token_size);
-bool adb_auth_verify(uint8_t* token, size_t token_size, uint8_t* sig, int sig_len);
-void adb_auth_confirm_key(unsigned char *data, size_t len, atransport *t);
+bool adbd_auth_verify(uint8_t* token, size_t token_size, uint8_t* sig, int sig_len);
+void adbd_auth_confirm_key(unsigned char *data, size_t len, atransport *t);
+
+void send_auth_request(atransport *t);
 
 #endif // ADB_HOST
 
diff --git a/adb/adb_auth_host.cpp b/adb/adb_auth_host.cpp
index 072c7f5..b5b9b97 100644
--- a/adb/adb_auth_host.cpp
+++ b/adb/adb_auth_host.cpp
@@ -45,6 +45,7 @@
 #include "adb_auth.h"
 #include "adb_utils.h"
 #include "sysdeps.h"
+#include "transport.h"
 
 static std::mutex& g_keys_mutex = *new std::mutex;
 static std::map<std::string, std::shared_ptr<RSA>>& g_keys =
@@ -421,3 +422,52 @@
         read_keys(path.c_str());
     }
 }
+
+static void send_auth_publickey(atransport* t) {
+    LOG(INFO) << "Calling send_auth_publickey";
+
+    std::string key = adb_auth_get_userkey();
+    if (key.empty()) {
+        D("Failed to get user public key");
+        return;
+    }
+
+    if (key.size() >= MAX_PAYLOAD_V1) {
+        D("User public key too large (%zu B)", key.size());
+        return;
+    }
+
+    apacket* p = get_apacket();
+    memcpy(p->data, key.c_str(), key.size() + 1);
+
+    p->msg.command = A_AUTH;
+    p->msg.arg0 = ADB_AUTH_RSAPUBLICKEY;
+
+    // adbd expects a null-terminated string.
+    p->msg.data_length = key.size() + 1;
+    send_packet(p, t);
+}
+
+void send_auth_response(uint8_t* token, size_t token_size, atransport* t) {
+    std::shared_ptr<RSA> key = t->NextKey();
+    if (key == nullptr) {
+        // No more private keys to try, send the public key.
+        send_auth_publickey(t);
+        return;
+    }
+
+    LOG(INFO) << "Calling send_auth_response";
+    apacket* p = get_apacket();
+
+    int ret = adb_auth_sign(key.get(), token, token_size, p->data);
+    if (!ret) {
+        D("Error signing the token");
+        put_apacket(p);
+        return;
+    }
+
+    p->msg.command = A_AUTH;
+    p->msg.arg0 = ADB_AUTH_SIGNATURE;
+    p->msg.data_length = ret;
+    send_packet(p, t);
+}
diff --git a/adb/adb_auth_client.cpp b/adb/adbd_auth.cpp
similarity index 82%
rename from adb/adb_auth_client.cpp
rename to adb/adbd_auth.cpp
index 84ad6ef..fa76c8d 100644
--- a/adb/adb_auth_client.cpp
+++ b/adb/adbd_auth.cpp
@@ -44,7 +44,9 @@
 static atransport* usb_transport;
 static bool needs_retry = false;
 
-bool adb_auth_verify(uint8_t* token, size_t token_size, uint8_t* sig, int sig_len) {
+bool auth_required = true;
+
+bool adbd_auth_verify(uint8_t* token, size_t token_size, uint8_t* sig, int sig_len) {
     static constexpr const char* key_paths[] = { "/adb_keys", "/data/misc/adb/adb_keys", nullptr };
 
     for (const auto& path : key_paths) {
@@ -85,7 +87,7 @@
     return false;
 }
 
-bool adb_auth_generate_token(void* token, size_t token_size) {
+static bool adbd_auth_generate_token(void* token, size_t token_size) {
     FILE* fp = fopen("/dev/urandom", "re");
     if (!fp) return false;
     bool okay = (fread(token, token_size, 1, fp) == 1);
@@ -105,7 +107,7 @@
     framework_fd = -1;
 }
 
-static void adb_auth_event(int fd, unsigned events, void*) {
+static void adbd_auth_event(int fd, unsigned events, void*) {
     if (events & FDE_READ) {
         char response[2];
         int ret = unix_read(fd, response, sizeof(response));
@@ -113,13 +115,13 @@
             framework_disconnected();
         } else if (ret == 2 && response[0] == 'O' && response[1] == 'K') {
             if (usb_transport) {
-                adb_auth_verified(usb_transport);
+                adbd_auth_verified(usb_transport);
             }
         }
     }
 }
 
-void adb_auth_confirm_key(unsigned char* key, size_t len, atransport* t) {
+void adbd_auth_confirm_key(unsigned char* key, size_t len, atransport* t) {
     if (!usb_transport) {
         usb_transport = t;
         t->AddDisconnect(&usb_disconnect);
@@ -150,7 +152,7 @@
     }
 }
 
-static void adb_auth_listener(int fd, unsigned events, void* data) {
+static void adbd_auth_listener(int fd, unsigned events, void* data) {
     int s = adb_socket_accept(fd, nullptr, nullptr);
     if (s < 0) {
         PLOG(ERROR) << "Failed to accept";
@@ -163,7 +165,7 @@
     }
 
     framework_fd = s;
-    fdevent_install(&framework_fde, framework_fd, adb_auth_event, nullptr);
+    fdevent_install(&framework_fde, framework_fd, adbd_auth_event, nullptr);
     fdevent_add(&framework_fde, FDE_READ);
 
     if (needs_retry) {
@@ -193,6 +195,28 @@
         return;
     }
 
-    fdevent_install(&listener_fde, fd, adb_auth_listener, NULL);
+    fdevent_install(&listener_fde, fd, adbd_auth_listener, NULL);
     fdevent_add(&listener_fde, FDE_READ);
 }
+
+void send_auth_request(atransport* t) {
+    LOG(INFO) << "Calling send_auth_request...";
+
+    if (!adbd_auth_generate_token(t->token, sizeof(t->token))) {
+        PLOG(ERROR) << "Error generating token";
+        return;
+    }
+
+    apacket* p = get_apacket();
+    memcpy(p->data, t->token, sizeof(t->token));
+    p->msg.command = A_AUTH;
+    p->msg.arg0 = ADB_AUTH_TOKEN;
+    p->msg.data_length = sizeof(t->token);
+    send_packet(p, t);
+}
+
+void adbd_auth_verified(atransport *t)
+{
+    handle_online(t);
+    send_connect(t);
+}
diff --git a/adb/transport.cpp b/adb/transport.cpp
index 87712fc..9880902 100644
--- a/adb/transport.cpp
+++ b/adb/transport.cpp
@@ -1071,6 +1071,7 @@
     }
 }
 
+#if ADB_HOST
 std::shared_ptr<RSA> atransport::NextKey() {
     if (keys_.empty()) keys_ = adb_auth_get_private_keys();
 
@@ -1078,3 +1079,4 @@
     keys_.pop_front();
     return result;
 }
+#endif
diff --git a/adb/transport.h b/adb/transport.h
index 959681f..aaa8be4 100644
--- a/adb/transport.h
+++ b/adb/transport.h
@@ -108,7 +108,9 @@
         return type == kTransportLocal && local_port_for_emulator_ == -1;
     }
 
+#if ADB_HOST
     std::shared_ptr<RSA> NextKey();
+#endif
 
     unsigned char token[TOKEN_SIZE] = {};
     size_t failed_auth_attempts = 0;
@@ -161,7 +163,9 @@
     // A list of adisconnect callbacks called when the transport is kicked.
     std::list<adisconnect*> disconnects_;
 
+#if ADB_HOST
     std::deque<std::shared_ptr<RSA>> keys_;
+#endif
 
     DISALLOW_COPY_AND_ASSIGN(atransport);
 };