Fixed various CMS_MODULE.install, by not marked module installed if an error occurred!

Improved Auth related module implementation by having a way to change settings like token, max age.
  - use CMS_SETUP.site_id and related "auth.$module.token" ... configuration values.
  - removed related CMS_..._CONSTANTS classes.

For auth session module, use auth_session as table name, and use VARCHAR(64).
Extracted sql from blog module, and store it under site/scripts/install.sql .
Renamed a few $modulename.sql as install.sql

modules/session_auth/cms_token_generator.e

@@ -0,0 +1,152 @@
+note
+	description: "Provides security routine helpers"
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	CMS_TOKEN_GENERATOR
+
+inherit
+
+	REFACTORING_HELPER
+
+feature -- Access
+
+	token: STRING
+			-- Cryptographic random base 64 string.
+		do
+			Result := salt_with_size (16)
+				--	Remove trailing equal sign
+			Result.keep_head (Result.count - 2)
+		end
+
+	salt: STRING
+			-- Cryptographic random number of 16 bytes.
+		do
+			Result := salt_with_size (16)
+		end
+
+	password: STRING
+			-- Cryptographic random password of 10 bytes.
+		do
+			Result := salt_with_size (10)
+				--	Remove trailing equal signs
+			Result.keep_head (Result.count - 2)
+		end
+
+	password_hash (a_password, a_salt: STRING): STRING
+			-- Password hash based on password `a_password' and salt value `a_salt'.
+		do
+			Result := sha1_string (a_password + a_salt)
+		end
+
+feature {NONE} -- Implementation
+
+	salt_with_size (a_val: INTEGER): STRING
+			-- Return a salt with size `a_val'.
+		local
+			l_salt: SALT_XOR_SHIFT_64_GENERATOR
+			l_array: ARRAY [INTEGER_8]
+			i: INTEGER
+		do
+			create l_salt.make (a_val)
+			create l_array.make_empty
+			i := 1
+			across
+				l_salt.new_sequence as c
+			loop
+				l_array.force (c.item.as_integer_8, i)
+				i := i + 1
+			end
+			Result := base_64 (l_array)
+		end
+
+	sha1_string (a_str: STRING): STRING
+			-- SHA1 diggest of `a_str'.
+		do
+			sha1.update_from_string (a_str)
+			Result := sha1.digest_as_string
+			sha1.reset
+		end
+
+	sha1: SHA1
+			-- Create a SHA1 object.
+		do
+			create Result.make
+		end
+
+feature -- Encoding
+
+	base_64 (bytes: SPECIAL [INTEGER_8]): STRING_8
+			-- Encodes a byte array into a STRING doing base64 encoding.
+		local
+			l_output: SPECIAL [INTEGER_8]
+			l_remaining: INTEGER
+			i, ptr: INTEGER
+			char: CHARACTER
+		do
+			to_implement ("Check existing code to do that!!!.")
+			create l_output.make_filled (0, ((bytes.count + 2) // 3) * 4)
+			l_remaining := bytes.count
+			from
+				i := 0
+				ptr := 0
+			until
+				l_remaining <= 3
+			loop
+				l_output [ptr] := encode_value (bytes [i] |>> 2)
+				ptr := ptr + 1
+				l_output [ptr] := encode_value (((bytes [i] & 0x3) |<< 4) | ((bytes [i + 1] |>> 4) & 0xF))
+				ptr := ptr + 1
+				l_output [ptr] := encode_value (((bytes [i + 1] & 0xF) |<< 2) | ((bytes [i + 2] |>> 6) & 0x3))
+				ptr := ptr + 1
+				l_output [ptr] := encode_value (bytes [i + 2] & 0x3F)
+				ptr := ptr + 1
+				l_remaining := l_remaining - 3
+				i := i + 3
+			end
+				-- encode when exactly 1 element (left) to encode
+			char := '='
+			if l_remaining = 1 then
+				l_output [ptr] := encode_value (bytes [i] |>> 2)
+				ptr := ptr + 1
+				l_output [ptr] := encode_value (((bytes [i]) & 0x3) |<< 4)
+				ptr := ptr + 1
+				l_output [ptr] := char.code.as_integer_8
+				ptr := ptr + 1
+				l_output [ptr] := char.code.as_integer_8
+				ptr := ptr + 1
+			end
+
+				-- encode when exactly 2 elements (left) to encode
+			if l_remaining = 2 then
+				l_output [ptr] := encode_value (bytes [i] |>> 2)
+				ptr := ptr + 1
+				l_output [ptr] := encode_value (((bytes [i] & 0x3) |<< 4) | ((bytes [i + 1] |>> 4) & 0xF));
+				ptr := ptr + 1
+				l_output [ptr] := encode_value ((bytes [i + 1] & 0xF) |<< 2);
+				ptr := ptr + 1
+				l_output [ptr] := char.code.as_integer_8
+				ptr := ptr + 1
+			end
+			create Result.make_empty
+			across
+				l_output as elem
+			loop
+				Result.append_character (elem.item.to_character_8)
+			end
+		end
+
+	base64_map: SPECIAL [CHARACTER_8]
+			-- Table for Base64 encoding.
+		once
+			Result := ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/").area
+		end
+
+	encode_value (i: INTEGER_8): INTEGER_8
+			-- Encode `i'.
+		do
+			Result := base64_map [i & 0x3F].code.as_integer_8
+		end
+
+end