Obsolete bx seed command

Issue: libbitcoin#728

data/bx

@@ -69,7 +69,6 @@ _bx()
         script-decode
         script-encode
         script-to-address
-        seed
         send-tx
         send-tx-node
         send-tx-p2p

include/bitcoin/explorer/commands/seed.hpp

@@ -60,8 +60,8 @@ namespace commands {
 /**
  * Various localizable strings.
  */
-#define BX_SEED_BIT_LENGTH_UNSUPPORTED \
-    "The seed size is not supported."
+#define BX_SEED_OBSOLETE \
+    "This command is obsolete. Use an alternative source of entropy for your key generation needs."
 
 /**
  * Class to implement the seed command.
@@ -111,6 +111,15 @@ class BCX_API seed
         return "Generate a pseudorandom seed.";
     }
 
+    /**
+     * Declare whether the command has been obsoleted.
+     * @return  True if the command is obsolete
+     */
+    virtual bool obsolete()
+    {
+        return true;
+    }
+
     /**
      * Load program argument definitions.
      * A value of -1 indicates that the number of instances is unlimited.
@@ -150,11 +159,6 @@ class BCX_API seed
             BX_CONFIG_VARIABLE ",c",
             value<boost::filesystem::path>(),
             "The path to the configuration settings file."
-        )
-        (
-            "bit_length,b",
-            value<uint16_t>(&option_.bit_length)->default_value(192),
-            "The length of the seed in bits. Must be divisible by 8 and must not be less than 128, defaults to 192."
         );
 
         return options;
@@ -179,23 +183,6 @@ class BCX_API seed
 
     /* Properties */
 
-    /**
-     * Get the value of the bit_length option.
-     */
-    virtual uint16_t& get_bit_length_option()
-    {
-        return option_.bit_length;
-    }
-
-    /**
-     * Set the value of the bit_length option.
-     */
-    virtual void set_bit_length_option(
-        const uint16_t& value)
-    {
-        option_.bit_length = value;
-    }
-
 private:
 
     /**
@@ -219,11 +206,9 @@ class BCX_API seed
     struct option
     {
         option()
-          : bit_length()
         {
         }
 
-        uint16_t bit_length;
     } option_;
 };
 

model/generate.xml

@@ -477,9 +477,8 @@
     <argument name="SCRIPT" stdin="true" type="script" description="The script to use in the address. Multiple tokens must be quoted. If not specified the script is read from STDIN."/>
   </command>
 
-  <command symbol="seed" output="base16" category="WALLET" description="Generate a pseudorandom seed.">
-    <option name="bit_length" type="uint16_t" default="192" description="The length of the seed in bits. Must be divisible by 8 and must not be less than 128, defaults to 192." />
-    <define name="BX_SEED_BIT_LENGTH_UNSUPPORTED" value="The seed size is not supported." />
+  <command symbol="seed" output="base16" category="WALLET" obsolete="true" description="Generate a pseudorandom seed.">
+    <define name="BX_SEED_OBSOLETE" value="This command is obsolete. Use an alternative source of entropy for your key generation needs." />
   </command>
 
   <command symbol="send-tx" formerly="sendtx-obelisk" output="string" category="ONLINE" network="true" description="Broadcast a transaction to the Bitcoin network via a Libbitcoin server.">

src/commands/seed.cpp

@@ -30,21 +30,8 @@ using namespace bc::config;
 
 console_result seed::invoke(std::ostream& output, std::ostream& error)
 {
-    const auto bit_length = get_bit_length_option();
-
-    // These are soft requirements for security and rationality.
-    // We use bit vs. byte length input as the more familiar convention.
-    if (bit_length < minimum_seed_size * byte_bits ||
-        bit_length % byte_bits != 0)
-    {
-        error << BX_SEED_BIT_LENGTH_UNSUPPORTED << std::endl;
-        return console_result::failure;
-    }
-
-    const auto seed = new_seed(bit_length);
-
-    output << base16(seed) << std::endl;
-    return console_result::okay;
+    error << BX_SEED_OBSOLETE << std::endl;
+    return console_result::failure;
 }
 
 } //namespace commands

test/commands/seed.cpp

@@ -24,50 +24,13 @@ BX_USING_NAMESPACES()
 BOOST_AUTO_TEST_SUITE(offline)
 BOOST_AUTO_TEST_SUITE(seed__invoke)
 
-#define BX_SEED_BITS_TO_TERMINATED_BASE16(bits) (2 * (bits / 8) + 1)
-
-BOOST_AUTO_TEST_CASE(seed__invoke__minimum_size__okay_output)
-{
-    BX_DECLARE_COMMAND(seed);
-
-    // Here we must explicitly set the default value, since we are bypassing
-    // the boost parser and variable bindings which implement defaults.
-    command.set_bit_length_option(128);
-    BX_REQUIRE_OKAY(command.invoke(output, error));
-    BOOST_REQUIRE(output.str().size() == BX_SEED_BITS_TO_TERMINATED_BASE16(128));
-}
-
-BOOST_AUTO_TEST_CASE(seed__invoke__good_size__okay_output)
-{
-    BX_DECLARE_COMMAND(seed);
-    command.set_bit_length_option(256);
-    BX_REQUIRE_OKAY(command.invoke(output, error));
-    BOOST_REQUIRE(output.str().size() == BX_SEED_BITS_TO_TERMINATED_BASE16(256));
-}
-
-BOOST_AUTO_TEST_CASE(seed__invoke_big_size_okay_output)
-{
-    BX_DECLARE_COMMAND(seed);
-    command.set_bit_length_option(512);
-    BX_REQUIRE_OKAY(command.invoke(output, error));
-    BOOST_REQUIRE(output.str().size() == BX_SEED_BITS_TO_TERMINATED_BASE16(512));
-}
-
-BOOST_AUTO_TEST_CASE(seed__invoke__too_short__failure_error)
+BOOST_AUTO_TEST_CASE(seed__invoke__always__failure_error)
 {
     BX_DECLARE_COMMAND(seed);
-    command.set_bit_length_option(64);
     BX_REQUIRE_FAILURE(command.invoke(output, error));
-    BX_REQUIRE_ERROR(BX_SEED_BIT_LENGTH_UNSUPPORTED "\n");
+    BX_REQUIRE_ERROR(BX_SEED_OBSOLETE "\n");
 }
 
-BOOST_AUTO_TEST_CASE(seed__invoke__not_byte_aligned__failure_error)
-{
-    BX_DECLARE_COMMAND(seed);
-    command.set_bit_length_option(129);
-    BX_REQUIRE_FAILURE(command.invoke(output, error));
-    BX_REQUIRE_ERROR(BX_SEED_BIT_LENGTH_UNSUPPORTED "\n");
-}
 
 BOOST_AUTO_TEST_SUITE_END()
 BOOST_AUTO_TEST_SUITE_END()