diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/main.go b/vendor/gobook.examples/ch4-05-grpc-hack/tls/main.go
index 445f5cd..62bbe90 100644
--- a/vendor/gobook.examples/ch4-05-grpc-hack/tls/main.go
+++ b/vendor/gobook.examples/ch4-05-grpc-hack/tls/main.go
@@ -18,13 +18,13 @@ var (
 	port = ":5000"
 
 	tlsDir        = "./tls-config"
-	tlsServerName = "server"
+	tlsServerName = "server.io"
 
-	ca         = tlsDir + "/ca.cer"
-	server_crt = tlsDir + "/server.cer"
-	server_key = tlsDir + "/server_pri.key"
-	client_crt = tlsDir + "/client.cer"
-	client_key = tlsDir + "/client_pri.key"
+	ca         = tlsDir + "/ca.crt"
+	server_crt = tlsDir + "/server.crt"
+	server_key = tlsDir + "/server.key"
+	client_crt = tlsDir + "/client.crt"
+	client_key = tlsDir + "/client.key"
 )
 
 type myGrpcServer struct{}
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/Makefile b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/Makefile
new file mode 100644
index 0000000..be9858f
--- /dev/null
+++ b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/Makefile
@@ -0,0 +1,35 @@
+
+default:
+	# ca
+	openssl genrsa -out ca.key 2048
+	openssl req -new -x509 -days 3650 \
+		-subj "/C=GB/L=China/O=gobook/CN=github.com" \
+		-key ca.key -out ca.crt
+
+	# server
+	openssl genrsa \
+		-out server.key 2048
+	openssl req -new \
+		-subj "/C=GB/L=China/O=server/CN=server.io" \
+		-key server.key \
+		-out server.csr
+	openssl x509 -req -sha256 \
+		-CA ca.crt -CAkey ca.key -CAcreateserial -days 3650 \
+		-in server.csr \
+		-out server.crt
+
+	# client
+	openssl genrsa \
+		-out client.key 2048
+	openssl req -new \
+		-subj "/C=GB/L=China/O=client/CN=client.io" \
+		-key client.key \
+		-out client.csr
+	openssl x509 -req -sha256 \
+		-CA ca.crt -CAkey ca.key -CAcreateserial -days 3650 \
+		-in client.csr \
+		-out client.crt
+
+clean:
+	-rm *.key *.crt *.csr *.srl
+
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.cer b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.cer
deleted file mode 100644
index db527cb..0000000
--- a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.cer
+++ /dev/null
@@ -1,14 +0,0 @@
------BEGIN CERTIFICATE-----
-MIICHzCCAYgCCQDAkKPvNa5BPzANBgkqhkiG9w0BAQUFADBUMQswCQYDVQQGEwJD
-TjEOMAwGA1UECAwFaHViZWkxDjAMBgNVBAcMBXd1aGFuMQswCQYDVQQKDAJxYzEL
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-DAV3dWhhbjELMAkGA1UECgwCcWMxCzAJBgNVBAsMAnFjMQswCQYDVQQDDAJxYzCB
-nzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEA0VwCvu9pALIap5SCgJTLqK61KGq5
-hkRTGGyHJsJsqJarT1Bitz+MDzKTLvoos2T6kxeuLruqvhKoBwfN9WwQmUPeM4so
-oC2VRj8dlg7XYxt9GNevrwT+pcvBA+KLvE8sWiO9OqY38ZiqG0/FilTZgRI10hFb
-4OlMjhlY3t80BAMCAwEAATANBgkqhkiG9w0BAQUFAAOBgQAM/3ZvEflWFb/zsWac
-VRjr3q5qwbT4iwrzihAF49BU5+Je9U6nSDugKznumpD77THLGsvtKbHuJcqvzsaF
-JI46P4OPg0SJFiTUZArE3L7BfuvdKVzkXy2ecH4ArTvAPuMJ9AGTE7MiwGOObwt2
-Z0LIDvk84JQPT95LGJfI2WJf8w==
------END CERTIFICATE-----
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.crt b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.crt
new file mode 100644
index 0000000..d5b99d9
--- /dev/null
+++ b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.crt
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDAjCCAeoCCQCF2wMTBQwdFzANBgkqhkiG9w0BAQsFADBDMQswCQYDVQQGEwJH
+QjEOMAwGA1UEBwwFQ2hpbmExDzANBgNVBAoMBmdvYm9vazETMBEGA1UEAwwKZ2l0
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+Xd3DS3Nd
+-----END CERTIFICATE-----
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.csr b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.csr
deleted file mode 100644
index c12590d..0000000
--- a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.csr
+++ /dev/null
@@ -1,11 +0,0 @@
------BEGIN CERTIFICATE REQUEST-----
-MIIBkzCB/QIBADBUMQswCQYDVQQGEwJDTjEOMAwGA1UECAwFaHViZWkxDjAMBgNV
-BAcMBXd1aGFuMQswCQYDVQQKDAJxYzELMAkGA1UECwwCcWMxCzAJBgNVBAMMAnFj
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-f2ravOx6alDVGeW4VQbno5cknkmRXqC8Z4aHJZZmjACqVoTTJfgl3zwQ0dBrOi7i
-Lkx1WKVy1reT2H+9W3E/HS35ECNfjDQZHazqwKwSiYl3MO0WAtBE1TIG2L2M1Vh0
-87gGx1v34zPhq3KG00yvf+ufE6f3Xyk=
------END CERTIFICATE REQUEST-----
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.key b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.key
index 678adda..ae26e92 100644
--- a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.key
+++ b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.key
@@ -1,18 +1,27 @@
 -----BEGIN RSA PRIVATE KEY-----
-Proc-Type: 4,ENCRYPTED
-DEK-Info: AES-256-CBC,61C7BEE93FF2FF7CB0347D22A335BC32
-
-0MUxoD0n/Fywg9cVKASdOiLf6Sx/zQihjpTOsItmCOwSmfRvcuoMJxwrGF0od3HC
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+BlpIV1cJIogvp8LeVa3uw3eNjs7hwdr+9PiOag9/3nkY3H5GQlDtNg==
 -----END RSA PRIVATE KEY-----
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.srl b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.srl
new file mode 100644
index 0000000..37b4934
--- /dev/null
+++ b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/ca.srl
@@ -0,0 +1 @@
+AC85DE90D9B5C67D
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client.cer b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client.cer
deleted file mode 100644
index 3c7b510..0000000
--- a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client.cer
+++ /dev/null
@@ -1,14 +0,0 @@
------BEGIN CERTIFICATE-----
-MIICKzCCAZQCCQCLijGZ94Ye3jANBgkqhkiG9w0BAQUFADBUMQswCQYDVQQGEwJD
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------END CERTIFICATE-----
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client.crt b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client.crt
new file mode 100644
index 0000000..799d8a8
--- /dev/null
+++ b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client.crt
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDATCCAekCCQCshd6Q2bXGfTANBgkqhkiG9w0BAQsFADBDMQswCQYDVQQGEwJH
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+6LsFM1g=
+-----END CERTIFICATE-----
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client.csr b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client.csr
index 001eaff..117e10e 100644
--- a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client.csr
+++ b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client.csr
@@ -1,11 +1,16 @@
 -----BEGIN CERTIFICATE REQUEST-----
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+e/1ylsnQ2ll6lJ3VKOaGD+oJcAV53pcNZfnK
 -----END CERTIFICATE REQUEST-----
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client.key b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client.key
index 3528225..0866053 100644
--- a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client.key
+++ b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client.key
@@ -1,18 +1,27 @@
 -----BEGIN RSA PRIVATE KEY-----
-Proc-Type: 4,ENCRYPTED
-DEK-Info: AES-256-CBC,75444A607F4C68746F58AD016EFC7A02
-
-EklVHcebRSvB6Y3val2+bl2O9SFqrbalS78DB9+cXvJ7pqDo7JKYLHxmX9Zh+kWU
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+045V5WIhkNv6Mmkh9rDSFcMmCiNQJ/DBMb6Ay24PdPwes8w/u9g=
 -----END RSA PRIVATE KEY-----
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client_pri.key b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client_pri.key
deleted file mode 100644
index 8e9204f..0000000
--- a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/client_pri.key
+++ /dev/null
@@ -1,15 +0,0 @@
------BEGIN RSA PRIVATE KEY-----
-MIICXAIBAAKBgQDD7ebsNWyT8bhKLkhn3HU1EgRhoQVRxNpt9qSIBeJFttWRByfI
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------END RSA PRIVATE KEY-----
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server.cer b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server.cer
deleted file mode 100644
index 763d999..0000000
--- a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server.cer
+++ /dev/null
@@ -1,14 +0,0 @@
------BEGIN CERTIFICATE-----
-MIICKzCCAZQCCQCLijGZ94Ye3TANBgkqhkiG9w0BAQUFADBUMQswCQYDVQQGEwJD
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------END CERTIFICATE-----
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server.crt b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server.crt
new file mode 100644
index 0000000..e6ae452
--- /dev/null
+++ b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server.crt
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDATCCAekCCQCshd6Q2bXGfDANBgkqhkiG9w0BAQsFADBDMQswCQYDVQQGEwJH
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+gT0GhPA=
+-----END CERTIFICATE-----
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server.csr b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server.csr
index 6d518d2..d9d460c 100644
--- a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server.csr
+++ b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server.csr
@@ -1,11 +1,16 @@
 -----BEGIN CERTIFICATE REQUEST-----
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 -----END CERTIFICATE REQUEST-----
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server.key b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server.key
index 872ea84..dc8ff79 100644
--- a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server.key
+++ b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server.key
@@ -1,18 +1,27 @@
 -----BEGIN RSA PRIVATE KEY-----
-Proc-Type: 4,ENCRYPTED
-DEK-Info: AES-256-CBC,DD0D53C9377DB7A137DB6E2F79A2D1FF
-
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+gOEt1b2QcVaqS1KS4MTipYALAoGBALh40NAR+V/1XccJr9Mp6iVwNAMFnR7z5b2Y
+RbmfhvZZoQQ/9e9tABkKONhKnoUyabfBSHy+AXiVembXT3u2jaiFq/wFMi2+VpPd
+gNHt08AoYHI3ypYJ0CAz26z98VQqFcTvlHBtL1A3HtpIv0QCbpWJGdr2sHhMx8zo
+rp/FHlYRAoGAJOGcDjOSnT/mf0iYYSEBW/v8Gn5PKAg4SoqJ2JTlpjKf4kRdzTU9
+j0S1n39r2Mwu7PSScxq6BfeEyv6mG165Sh3FRP/6cL5OBeENuRCl33lszc61NEgy
+R0M2WsCGyCvZ4nf9ZRNpXhrNDOIf74EpDJ785DkvKYVbMSFNw+EPuMM=
 -----END RSA PRIVATE KEY-----
diff --git a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server_pri.key b/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server_pri.key
deleted file mode 100644
index 1adb4cf..0000000
--- a/vendor/gobook.examples/ch4-05-grpc-hack/tls/tls-config/server_pri.key
+++ /dev/null
@@ -1,15 +0,0 @@
------BEGIN RSA PRIVATE KEY-----
-MIICXAIBAAKBgQDQ7sPFNdImhPTpLC9O2liMGA2lk+MOrSdeyXuXXkKDyh0JkajJ
-x2OG4LhZblfLzDPJWvb9VPUG58tLT8kNbZGVhpE22AHhmfLo+0FJ91sX7aN1eMeS
-IwZ1Njkr2sdZgzEblW8z3FdysDe/+9rctGL1QcbFlzotY+caXQoEfQLsowIDAQAB
-AoGAOFKVPd2TaEThTNZXbndX9XQqgZ9LT1KIUXoZMiX74lEi4Mh+at6wStTbfWhM
-jKjgsQAvov07DICCAixg85i87MhkRLZNgBi6/qRj/uPwk+7Wce3QxppvLjAtpLcq
-0ucJYCEMwCncajEj0BeQztec2fkn8A5NCQP6QWfKEJV0ktECQQDq0h+yKU0v5r8/
-E6Vz2YXYhFTFrzIzDzfI/Y9/cqXzEO1qbYElAnbZw1thmexpeKnvobNtNPpBWZkm
-blPDHN1ZAkEA48bmMPxokDL6JLO3nOLnXcjxXtpZqPdrV1reLKZaa7UjXdcfXrcn
-mtduRs42jMrioN8yGOfsva6Q59i7h0RuWwJACh5Tz1GISfAffZBTKNLOua26GWqb
-NygIt1h1voAqNnccQ+HEFtwsUuXgIiyHy2OvruvA14vY3MgHmWhXo6iywQJAL/gx
-fluKAeRafeRDZQz8QOoSuzEs9MK2nn0KkUivfkN1oUuu1ZmpA5kfJlZDcr8/nzWi
-LVCasQ/UgJ9KTyCARQJBAK+2jSCLjO7idDzrtSBl0UUH4TVGzB6Z7jcryyxkeO4q
-x10JT7UYLzHO8IzXd/DKhe9QzgsMGs0g99sTY1NtSK0=
------END RSA PRIVATE KEY-----