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# std.digest.md

Computes MD5 hashes of arbitrary data. MD5 hashes are 16 byte quantities that are like a checksum or CRC, but are more robust.

Category | Functions
--- | ---
Template API | MD5
OOP API | MD5Digest
Helpers | md5Of

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

CTFE Digests do not work in CTFE

Authors:
Piotr Szturmaj, Kai Nacke, Johannes Pfau
The routines and algorithms are derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm.

References Wikipedia on MD5

Source std/digest/md.d

Examples:

    //Template API
    import std.digest.md;

    //Feeding data
    ubyte[1024] data;
    MD5 md5;
    md5.start();
    md5.put(data[]);
    md5.start(); //Start again
    md5.put(data[]);
    auto hash = md5.finish();

Examples:

    //OOP API
    import std.digest.md;

    auto md5 = new MD5Digest();
    ubyte[] hash = md5.digest("abc");
    writeln(toHexString(hash)); // "900150983CD24FB0D6963F7D28E17F72"

    //Feeding data
    ubyte[1024] data;
    md5.put(data[]);
    md5.reset(); //Start again
    md5.put(data[]);
    hash = md5.finish();

struct `MD5`;
  Template API MD5 implementation. See std.digest for differences between template and OOP API.
  Examples:

      //Simple example, hashing a string using md5Of helper function
      ubyte[16] hash = md5Of("abc");
      //Let's get a hash string
      writeln(toHexString(hash)); // "900150983CD24FB0D6963F7D28E17F72"

  Examples:

      //Using the basic API
      MD5 hash;
      hash.start();
      ubyte[1024] data;
      //Initialize data here...
      hash.put(data);
      ubyte[16] result = hash.finish();

  Examples:

      //Let's use the template features:
      void doSomething(T)(ref T hash)
      if (isDigest!T)
      {
          hash.put(cast(ubyte) 0);
      }
      MD5 md5;
      md5.start();
      doSomething(md5);
      writeln(toHexString(md5.finish())); // "93B885ADFE0DA089CDF634904FD59F71"

  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

        MD5 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 MD5 digest.

    Note For this MD5 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

        MD5 digest;
        //digest.start(); //Not necessary
        digest.put(0);

  pure nothrow @nogc @trusted ubyte[16] `finish`();
    Returns the finished MD5 hash. This also calls start to reset the internal state.
    Examples:

        //Simple example
        MD5 hash;
        hash.start();
        hash.put(cast(ubyte) 0);
        ubyte[16] result = hash.finish();

auto `md5Of`(T...)(T `data`);
  This is a convenience alias for std.digest.digest using the MD5 implementation.
  Examples:

      ubyte[16] hash = md5Of("abc");
      writeln(hash); // digest!MD5("abc")

alias `MD5Digest` = std.digest.WrapperDigest!(MD5).WrapperDigest;
  OOP API MD5 implementation. See std.digest for differences between template and OOP API.
  This is an alias for std.digest.WrapperDigest!MD5, see there for more information.
  Examples:

      //Simple example, hashing a string using Digest.digest helper function
      auto md5 = new MD5Digest();
      ubyte[] hash = md5.digest("abc");
      //Let's get a hash string
      writeln(toHexString(hash)); // "900150983CD24FB0D6963F7D28E17F72"

  Examples:

      //Let's use the OOP features:
      void test(Digest dig)
      {
       dig.put(cast(ubyte) 0);
      }
      auto md5 = new MD5Digest();
      test(md5);

      //Let's use a custom buffer:
      ubyte[16] buf;
      ubyte[] result = md5.finish(buf[]);
      writeln(toHexString(result)); // "93B885ADFE0DA089CDF634904FD59F71"

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