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# std.digest.ripemd

Computes RIPEMD-160 hashes of arbitrary data. RIPEMD-160 hashes are 20 byte quantities that are like a checksum or CRC, but are more robust.

Category | Functions
--- | ---
Template API | RIPEMD160
OOP API | RIPEMD160Digest
Helpers | ripemd160Of

This module conforms to the APIs defined in std.digest.digest. To understand the differences between the template and the OOP API, see std.digest.digest.
This module publicly imports std.digest.digest and can be used as a stand-alone module.
License:
Boost License 1.0.

CTFE: Digests do not work in CTFE

Authors:
Kai Nacke
The algorithm was designed by Hans Dobbertin, Antoon Bosselaers, and Bart Preneel.
The D implementation is a direct translation of the ANSI C implementation by Antoon Bosselaers.

References:

- The hash function RIPEMD-160
- Wikipedia on RIPEMD-160

Source: std/digest/ripemd.d

Examples:

    //Template API
    import std.digest.md;

    ubyte[20] hash = ripemd160Of("abc");
    assert(toHexString(hash) == "8EB208F7E05D987A9B044A8E98C6B087F15A0BFC");

    //Feeding data
    ubyte[1024] data;
    RIPEMD160 md;
    md.start();
    md.put(data[]);
    md.start(); //Start again
    md.put(data[]);
    hash = md.finish();

Examples:

    //OOP API
    import std.digest.md;

    auto md = new RIPEMD160Digest();
    ubyte[] hash = md.digest("abc");
    assert(toHexString(hash) == "8EB208F7E05D987A9B044A8E98C6B087F15A0BFC");

    //Feeding data
    ubyte[1024] data;
    md.put(data[]);
    md.reset(); //Start again
    md.put(data[]);
    hash = md.finish();

struct `RIPEMD160`;
  Template API `RIPEMD160` implementation. See std.digest.digest for differences between template and OOP API.
  Examples:

      //Simple example, hashing a string using ripemd160Of helper function
      ubyte[20] hash = ripemd160Of("abc");
      //Let's get a hash string
      assert(toHexString(hash) == "8EB208F7E05D987A9B044A8E98C6B087F15A0BFC");

  Examples:

      //Using the basic API
      RIPEMD160 hash;
      hash.start();
      ubyte[1024] data;
      //Initialize data here...
      hash.put(data);
      ubyte[20] result = hash.finish();

  Examples:

      //Let's use the template features:
      void doSomething(T)(ref T hash) if (isDigest!T)
      {
          hash.put(cast(ubyte)0);
      }
      RIPEMD160 md;
      md.start();
      doSomething(md);
      assert(toHexString(md.finish()) == "C81B94933420221A7AC004A90242D8B1D3E5070D");

  Examples:

      //Simple example
      RIPEMD160 hash;
      hash.start();
      hash.put(cast(ubyte)0);
      ubyte[20] result = hash.finish();
      assert(toHexString(result) == "C81B94933420221A7AC004A90242D8B1D3E5070D");

  pure nothrow @nogc @trusted void `put`(scope const(ubyte)[] `data`...);
    Use this to feed the digest with `data`. Also implements the std.range.primitives.isOutputRange interface for ubyte and const(ubyte)[].

    Example:

        RIPEMD160 dig;
        dig.put(cast(ubyte)0); //single ubyte
        dig.put(cast(ubyte)0, cast(ubyte)0); //variadic
        ubyte[10] buf;
        dig.put(buf); //buffer

  pure nothrow @nogc @safe void `start`();
    Used to (re)initialize the RIPEMD160 digest.

    Note: For this RIPEMD160 Digest implementation calling `start` after default construction is not necessary. Calling `start` is only necessary to reset the Digest.

    Generic code which deals with different Digest types should always call `start` though.

    Example:

        RIPEMD160 digest;
        //digest.start(); //Not necessary
        digest.put(0);

  pure nothrow @nogc @trusted ubyte[20] `finish`();
    Returns the finished RIPEMD160 hash. This also calls start to reset the internal state.

    Example:

        //Simple example
        RIPEMD160 hash;
        hash.start();
        hash.put(cast(ubyte)0);
        ubyte[20] result = hash.finish();
        assert(toHexString(result) == "C81B94933420221A7AC004A90242D8B1D3E5070D");

auto `ripemd160Of`(T...)(T `data`);
  This is a convenience alias for std.digest.digest.digest using the RIPEMD160 implementation.
  Examples:

      ubyte[20] hash = ripemd160Of("abc");
      assert(hash == digest!RIPEMD160("abc"));

alias `RIPEMD160Digest` = std.digest.digest.WrapperDigest!(RIPEMD160).WrapperDigest;
  OOP API RIPEMD160 implementation. See std.digest.digest for differences between template and OOP API.
  This is an alias for std.digest.digest.WrapperDigest!RIPEMD160, see there for more information.
  Examples:

      //Simple example, hashing a string using Digest.digest helper function
      auto md = new RIPEMD160Digest();
      ubyte[] hash = md.digest("abc");
      //Let's get a hash string
      assert(toHexString(hash) == "8EB208F7E05D987A9B044A8E98C6B087F15A0BFC");

  Examples:

      //Let's use the OOP features:
      void test(Digest dig)
      {
        dig.put(cast(ubyte)0);
      }
      auto md = new RIPEMD160Digest();
      test(md);

      //Let's use a custom buffer:
      ubyte[20] buf;
      ubyte[] result = md.finish(buf[]);
      assert(toHexString(result) == "C81B94933420221A7AC004A90242D8B1D3E5070D");

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