Add AES-CTR ciphers info (#820)

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

doc/shadowsocks-libev.asciidoc

@@ -50,9 +50,10 @@ Set the password. The server and the client should use the same password.
 -m <encrypt_method>::
 Set the cipher.
 +
-*Shadowsocks-libev* accepts 18 different ciphers:
+*Shadowsocks-libev* accepts 21 different ciphers:
 +
-table, rc4, rc4-md5, aes-128-cfb, aes-192-cfb, aes-256-cfb, bf-cfb,
+table, rc4, rc4-md5, aes-128-cfb, aes-192-cfb, aes-256-cfb,
+aes-128-ctr, aes-192-ctr, aes-256-ctr, bf-cfb,
 camellia-128-cfb, camellia-192-cfb, camellia-256-cfb, cast5-cfb, des-cfb,
 idea-cfb, rc2-cfb, seed-cfb, salsa20, chacha20 and chacha20-ietf.
 +

doc/ss-local.asciidoc

@@ -43,9 +43,10 @@ Set the password. The server and the client should use the same password.
 -m <encrypt_method>::
 Set the cipher.
 +
-*Shadowsocks-libev* accepts 18 different ciphers:
+*Shadowsocks-libev* accepts 21 different ciphers:
 +
-table, rc4, rc4-md5, aes-128-cfb, aes-192-cfb, aes-256-cfb, bf-cfb,
+table, rc4, rc4-md5, aes-128-cfb, aes-192-cfb, aes-256-cfb,
+aes-128-ctr, aes-192-ctr, aes-256-ctr, bf-cfb,
 camellia-128-cfb, camellia-192-cfb, camellia-256-cfb, cast5-cfb, des-cfb,
 idea-cfb, rc2-cfb, seed-cfb, salsa20, chacha20 and chacha20-ietf.
 +

doc/ss-manager.asciidoc

@@ -41,9 +41,10 @@ Set the password. The server and the client should use the same password.
 -m <encrypt_method>::
 Set the cipher.
 +
-*Shadowsocks-libev* accepts 18 different ciphers:
+*Shadowsocks-libev* accepts 21 different ciphers:
 +
-table, rc4, rc4-md5, aes-128-cfb, aes-192-cfb, aes-256-cfb, bf-cfb,
+table, rc4, rc4-md5, aes-128-cfb, aes-192-cfb, aes-256-cfb,
+aes-128-ctr, aes-192-ctr, aes-256-ctr, bf-cfb,
 camellia-128-cfb, camellia-192-cfb, camellia-256-cfb, cast5-cfb, des-cfb,
 idea-cfb, rc2-cfb, seed-cfb, salsa20, chacha20 and chacha20-ietf.
 +

doc/ss-redir.asciidoc

@@ -45,9 +45,10 @@ password.
 -m <encrypt_method>::
 Set the cipher.
 +
-*Shadowsocks-libev* accepts 18 different ciphers:
+*Shadowsocks-libev* accepts 21 different ciphers:
 +
-table, rc4, rc4-md5, aes-128-cfb, aes-192-cfb, aes-256-cfb, bf-cfb,
+table, rc4, rc4-md5, aes-128-cfb, aes-192-cfb, aes-256-cfb,
+aes-128-ctr, aes-192-ctr, aes-256-ctr, bf-cfb,
 camellia-128-cfb, camellia-192-cfb, camellia-256-cfb, cast5-cfb, des-cfb,
 idea-cfb, rc2-cfb, seed-cfb, salsa20, chacha20 and chacha20-ietf.
 +

doc/ss-server.asciidoc

@@ -41,9 +41,10 @@ Set the password. The server and the client should use the same password.
 -m <encrypt_method>::
 Set the cipher.
 +
-*Shadowsocks-libev* accepts 18 different ciphers:
+*Shadowsocks-libev* accepts 21 different ciphers:
 +
-table, rc4, rc4-md5, aes-128-cfb, aes-192-cfb, aes-256-cfb, bf-cfb,
+table, rc4, rc4-md5, aes-128-cfb, aes-192-cfb, aes-256-cfb,
+aes-128-ctr, aes-192-ctr, aes-256-ctr, bf-cfb,
 camellia-128-cfb, camellia-192-cfb, camellia-256-cfb, cast5-cfb, des-cfb,
 idea-cfb, rc2-cfb, seed-cfb, salsa20, chacha20 and chacha20-ietf.
 +

doc/ss-tunnel.asciidoc

@@ -44,9 +44,10 @@ Set the password. The server and the client should use the same password.
 -m <encrypt_method>::
 Set the cipher.
 +
-*Shadowsocks-libev* accepts 18 different ciphers:
+*Shadowsocks-libev* accepts 21 different ciphers:
 +
-table, rc4, rc4-md5, aes-128-cfb, aes-192-cfb, aes-256-cfb, bf-cfb,
+table, rc4, rc4-md5, aes-128-cfb, aes-192-cfb, aes-256-cfb,
+aes-128-ctr, aes-192-ctr, aes-256-ctr, bf-cfb,
 camellia-128-cfb, camellia-192-cfb, camellia-256-cfb, cast5-cfb, des-cfb,
 idea-cfb, rc2-cfb, seed-cfb, salsa20, chacha20 and chacha20-ietf.
 +

src/utils.c

@@ -243,6 +243,8 @@ usage()
         "       -m <encrypt_method>        Encrypt method: table, rc4, rc4-md5,\n");
     printf(
         "                                  aes-128-cfb, aes-192-cfb, aes-256-cfb,\n");
+    printf(
+        "                                  aes-128-ctr, aes-192-ctr, aes-256-ctr,\n");
     printf(
         "                                  bf-cfb, camellia-128-cfb, camellia-192-cfb,\n");
     printf(