The D Programming Language

Scheduled for deprecation. Please use instead.

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

There are two ways to do this. The first does it all in one function call to sum(). The second is for when the data is buffered.

Known Bugs
MD5 digests have been demonstrated to not be unique.
The routines and algorithms are derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm.
Wikipedia on MD5
// This code is derived from the

// RSA Data Security, Inc. MD5 Message-Digest Algorithm.

import std.md5;
import std.stdio;

void main(string[] args)
    foreach (arg; args)

/// Digests a file and prints the result.

void mdFile(string filename)
    ubyte[16] digest;

    MD5_CTX context;
    foreach (buffer; File(filename).byChunk(64 * 1024))
    writefln("MD5 (%s) = %s", filename, digestToString(digest));

void  sum(ref ubyte[16] digest, in void[][] data...);

Computes MD5 digest of several arrays of data.

string  digestToString(in ubyte[16] digest);

Converts MD5 digest to a string.

string  getDigestString(in void[][] data...);

Gets the digest of all data items passed in.

string a = "Mary has ", b = "a little lamb";
int[] c = [ 1, 2, 3, 4, 5 ];
string d = getDigestString(a, b, c);

struct  MD5_CTX;

Holds context of MD5 computation.

Used when data to be digested is buffered.

void  start();

MD5 initialization. Begins an MD5 operation, writing a new context.

void  update(const void[] input);

MD5 block  update operation. Continues an MD5 message-digest operation, processing another message block, and updating the context.

void  finish(ref ubyte[16] digest);

MD5 finalization. Ends an MD5 message-digest operation, writing the the message to digest and zeroing the context.