668 lines
20 KiB
HTML
668 lines
20 KiB
HTML
{% extends "_layout.html" %}
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{% block title %}Common structure Specification{% endblock %}
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{% block content %}
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Updated August 2010, current as of router version 0.8
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<h1>Data types Specification</h1>
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<p>
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This document describes some data types common to all I2P protocols, like
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<a href="i2np.html">I2NP</a>,
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<a href="i2cp.html">I2CP</a>,
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<a href="udp.html">SSU</a>,
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etc.
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</p>
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<h2 id="type_Integer">Integer</h2>
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<h4>Description</h4>
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<p>
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Represents a non-negative integer.
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</p>
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<h4>Contents</h4>
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<p>
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1 to 8 bytes in network byte order representing an unsigned integer
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</p>
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<h2 id="type_Date">Date</h2>
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<h4>Description</h4>
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<p>
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The number of milliseconds since midnight on January 1, 1970 in the GMT timezone.
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If the number is 0, the date is undefined or null.
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</p>
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<h4>Contents</h4>
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<p>
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8 byte <a href="#type_Integer">Integer</a>
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</p>
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<h2 id="type_String">String</h2>
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<h4>Description</h4>
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<p>
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Represents a UTF-8 encoded string.
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</p>
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<h4>Contents</h4>
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<p>
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1 or more bytes where the first byte is the number of bytes(not characters!) in the string and the remaining 0-255 bytes are the non-null terminated UTF-8 encoded character array
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</p>
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<h2 id="type_Boolean">Boolean</h2>
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<h4>Description</h4>
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<p>
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A boolean value, supporting null/unknown representation
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0=false, 1=true, 2=unknown/null
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</p>
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<h4>Contents</h4>
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<p>
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1 byte <a href="#type_Integer">Integer</a>
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</p>
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<h4>Notes</h4>
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Deprecated - unused
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<h2 id="type_PublicKey">PublicKey</h2>
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<h4>Description</h4>
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<p>
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This structure is used in ElGamal encryption, representing only the exponent, not the primes, which are constant and defined in
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<a href="how_cryptography.html#elgamal">the cryptography specification</a>.
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</p>
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<h4>Contents</h4>
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<p>
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256 bytes
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</p>
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/PublicKey.html">Javadoc</a></h4>
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<h2 id="type_PrivateKey">PrivateKey</h2>
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<h4>Description</h4>
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<p>
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This structure is used in ElGamal decryption, representing only the exponent, not the primes which are constant and defined in
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<a href="how_cryptography.html#elgamal">the cryptography specification</a>.
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</p>
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<h4>Contents</h4>
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<p>
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256 bytes
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</p>
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/PrivateKey.html">Javadoc</a></h4>
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<h2 id="type_SessionKey">SessionKey</h2>
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<h4>Description</h4>
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<p>
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This structure is used for AES256 encryption and decryption.
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</p>
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<h4>Contents</h4>
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<p>
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32 bytes
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</p>
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/SessionKey.html">Javadoc</a></h4>
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<h2 id="type_SigningPublicKey">SigningPublicKey</h2>
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<h4>Description</h4>
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<p>
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This structure is used for verifying <a href="how_cryptography.html#DSA">DSA</a> signatures.
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</p>
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<h4>Contents</h4>
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<p>
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128 bytes
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</p>
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/SigningPublicKey.html">Javadoc</a></h4>
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<h2 id="type_SigningPrivateKey">SigningPrivateKey</h2>
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<h4>Description</h4>
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<p>
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This structure is used for creating <a href="how_cryptography.html#DSA">DSA</a> signatures.
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</p>
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<h4>Contents</h4>
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<p>
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20 bytes
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</p>
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/SigningPrivateKey.html">Javadoc</a></h4>
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<h2 id="type_Signature">Signature</h2>
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<h4>Description</h4>
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<p>
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This structure represents the <a href="how_cryptography.html#DSA">DSA</a> signature of some data.
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</p>
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<h4>Contents</h4>
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<p>
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40 bytes
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</p>
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/Signature.html">Javadoc</a></h4>
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<h2 id="type_Hash">Hash</h2>
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<h4>Description</h4>
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<p>
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Represents the SHA256 of some data.
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</p>
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<h4>Contents</h4>
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<p>
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32 bytes
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</p>
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/Hash.html">Javadoc</a></h4>
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<h2 id="type_SessionTag">Session Tag</h2>
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<h4>Description</h4>
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<p>
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A random number
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</p>
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<h4>Contents</h4>
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<p>
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32 bytes
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</p>
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/SessionTag.html">Javadoc</a></h4>
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<h2 id="type_TunnelId">TunnelId</h2>
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<h4>Description</h4>
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<p>
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Defines an identifier that is unique to each router in a tunnel.
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</p>
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<h4>Contents</h4>
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<p>
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4 byte <a href="#type_Integer">Integer</a>
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</p>
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/TunnelID.html">Javadoc</a></h4>
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<h2 id="type_Certificate">Certificate</h2>
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<h4>Description</h4>
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<p>
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A certificate is a container for various receipts or proof of works used throughout the I2P network.
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</p>
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<h4>Contents</h4>
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<p>
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1 byte <a href="#type_Integer">Integer</a> specifying certificate type, followed by a 2 <a href="#type_Integer">Integer</a> specifying the size of the certificate payload, then that many bytes.
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</p>
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<pre>
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{% filter escape %}
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+----+----+----+----+----+--//
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|type| length | payload
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+----+----+----+----+----+--//
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type :: Integer
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length -> 1 byte
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case 0 -> NULL
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case 1 -> HASHCASH
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case 2 -> HIDDEN
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case 3 -> SIGNED
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case 4 -> MULTIPLE
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length :: Integer
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length -> 2 bytes
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payload :: data
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length -> $length bytes
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{% endfilter %}
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</pre>
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<h4>Notes</h4>
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<ul>
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<li>
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For <a href="#struct_RouterIdentity">Router Identities</a>, the Certificate is always NULL, no others are currently implemented.
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</li><li>
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For <a href="i2np_spec.html#struct_GarlicClove">Garlic Cloves</a>, the Certificate is always NULL, no others are currently implemented.
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</li><li>
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For <a href="i2np_spec.html#msg_Garlic">Garlic Messages</a>, the Certificate is always NULL, no others are currently implemented.
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</li><li>
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For <a href="#struct_Destination">Destinations</a>, the Certificate may be non-NULL,
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however non-NULL certs are not widely used, and any checking is left to the application-level.
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</li></ul>
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/Certificate.html">Javadoc</a></h4>
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<h2 id="type_Mapping">Mapping</h2>
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<h4>Description</h4>
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<p>
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A set of key/value mappings or properties
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</p>
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<h4>Contents</h4>
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<p>
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A 2-byte size Integer followed by a series of String=String; pairs
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</p>
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<pre>
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{% filter escape %}
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+----+----+----+----+----+----+----+----+
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| size |key string (len + data) | = |
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+----+----+----+----+----+----+----+----+
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| val string (len + data) | ; | ...
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+----+----+----+----+----+----+----+
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size :: Integer
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length -> 2 bytes
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Total number of bytes that follow
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key string :: String
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A string (one byte length followed by UTF-8 encoded characters)
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= :: A single byte containing '='
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val string :: String
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A string (one byte length followed by UTF-8 encoded characters)
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; :: A single byte containing ';'
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{% endfilter %}
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</pre>
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<h4>Notes</h4>
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<ul>
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<li>
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The encoding isn't optimal - we either need the '=' and ';' characters, or the string lengths, but not both
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<li>
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Some documentation says that the strings may not include '=' or ';' but this encoding supports them
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<li>
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Strings are defined to be UTF-8 but in the current implementation, I2CP uses UTF-8 but I2NP does not.
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For example,
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UTF-8 strings in a RouterInfo options mapping in a I2NP Database Store Message will be corrupted.
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</ul>
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/DataHelper.html">Javadoc</a></h4>
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<h1>Common structure specification</h1>
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<h2 id="struct_RouterIdentity">RouterIdentity</h2>
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<h4>Description</h4>
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<p>
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Defines the way to uniquely identify a particular router
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</p>
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<h4>Contents</h4>
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<p>
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<a href="#type_PublicKey">PublicKey</a> followed by <a href="#type_SigningPublicKey">SigningPublicKey</a> and then a <a href="#type_Certificate">Certificate</a>
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</p>
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<pre>
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{% filter escape %}
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+----+----+----+----+----+----+----+----+
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| public_key |
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+ +
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~ ~
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~ ~
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+----+----+----+----+----+----+----+----+
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| signing_key |
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+ +
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~ ~
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~ ~
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+----+----+----+----+----+----+----+----+
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| certificate |
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+----+----+----+--//
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public_key :: PublicKey
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length -> 256 bytes
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signing_key :: SigningPublicKey
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length -> 128 bytes
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certificate :: Certificate
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length -> >= 3 bytes
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Total length: 387+ bytes
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{% endfilter %}
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</pre>
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<h4>Notes</h4>
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The certificate for a RouterIdentity is currently unused and is always NULL.
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/RouterIdentity.html">Javadoc</a></h4>
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<h2 id="struct_Destination">Destination</h2>
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<h4>Description</h4>
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<p>
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A Destination defines a particular endpoint to which messages can be directed for secure delivery.
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</p>
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<h4>Contents</h4>
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<p>
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<a href="#type_PublicKey">PublicKey</a> followed by a <a href="#type_SigningPublicKey">SigningPublicKey</a> and then a <a href="#type_Certificate">Certificate</a>
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</p>
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<pre>
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{% filter escape %}
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+----+----+----+----+----+----+----+----+
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| public_key |
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+ +
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~ ~
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~ ~
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+----+----+----+----+----+----+----+----+
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| signing_public_key |
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+ +
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~ ~
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~ ~
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+----+----+----+----+----+----+----+----+
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| certificate
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+---//
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public_key :: PublicKey
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length -> 256 bytes
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signing_public_key :: SigningPublicKey
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length -> 128 bytes
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certificate :: Certificate
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length -> >= 3 bytes
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Total length: 387+ bytes
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{% endfilter %}
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</pre>
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/Destination.html">Javadoc</a></h4>
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<h2 id="struct_Lease">Lease</h2>
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<h4>Description</h4>
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<p>
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Defines the authorization for a particular tunnel to receive messages targeting a <a href="#struct_Destination">Destination</a>.
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</p>
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<h4>Contents</h4>
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<p>
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<a href="#struct_RouterIdentity">RouterIdentity</a> of the gateway router, then the <a href="#type_TunnelId">TunnelId</a>, and finally an end <a href="#type_Date">Date</a>
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</p>
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<pre>
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{% filter escape %}
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+----+----+----+----+----+----+----+----+
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| tunnel_gw |
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+ +
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| |
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~ ~
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~ ~
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+ +----+----+----+----+
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| | tunnel_id |
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+----+----+----+----+----+----+----+----+
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| end_date |
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+----+----+----+----+----+----+----+----+
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tunnel_gw :: RouterIdentity of the tunnel gateway
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length -> >= 387 bytes
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tunnel_id :: TunnelId
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length -> 4 bytes
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end_date :: Date
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length -> 8 bytes
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{% endfilter %}
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</pre>
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<h4>Notes</h4>
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<ul>
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<li>
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Could this be optimized to include the Hash of the Router Identity instead of the full Router Identtity?
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</li></ul>
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/Lease.html">Javadoc</a></h4>
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<h2 id="struct_LeaseSet">LeaseSet</h2>
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<h4>Description</h4>
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<p>
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Contains all of the currently authorized <a href="#struct_Lease">Lease</a>s for a particular <a href="#struct_Destination">Destination</a>, the <a href="#type_PublicKey">PublicKey</a> to which garlic messages can be encrypted,
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and then the the <a href="#type_SigningPublicKey">public key</a> that can be used to revoke this particular version of the structure. The <a href="#struct_LeaseSet">LeaseSet</a> is one of the two structures stored in the network database(
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the other being <a href="#struct_RouterInfo">RouterInfo</a>), and is keyed under the SHA256 of the contained <a href="#struct_Destination">Destination</a>.
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</p>
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<h4>Contents</h4>
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<p>
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<a href="#struct_Destination">Destination</a>, followed by a <a href="#type_PublicKey">PublicKey</a> for encryption, then a <a href="#type_SigningPublicKey">SigningPublicKey</a> which can be used to revoke this version of the <a href="#struct_LeaseSet">LeaseSet</a>,
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then a 1 byte <a href="#type_Integer">Integer</a> specifying how many <a href="#struct_Lease">Lease</a> structures are in the set, followed by the actual <a href="#struct_Lease">Lease</a> structures and finally a <a href="#type_Signature">Signature</a> of the previous
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bytes signed by the <a href="#struct_Destination">Destination's</a> <a href="#type_SigningPrivateKey">SigningPrivateKey</a>
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<pre>
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{% filter escape %}
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+----+----+----+----+----+----+----+----+
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| destination |
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+ +
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| |
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~ ~
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~ ~
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+----+----+----+----+----+----+----+----+
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| encryption_key |
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+ +
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| |
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~ ~
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~ ~
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+----+----+----+----+----+----+----+----+
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| signing_key |
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+ +
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| |
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~ ~
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~ ~
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+----+----+----+----+----+----+----+----+
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|num | Lease 0 |
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+----+ +
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| |
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~ ~
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~ ~
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+----+----+----+----+----+----+----+----+
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| Lease 1 |
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+ +
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| |
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~ ~
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~ ~
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~ ~
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~ ~
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+----+----+----+----+----+----+----+----+
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| Lease ($num-1) |
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+ +
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| |
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~ ~
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~ ~
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+----+----+----+----+----+----+----+----+
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| signature |
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+ +
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+ +
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+ +
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+ +
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+----+----+----+----+----+----+----+----+
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destination :: Destination
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length -> >= 387 bytes
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encryption_key :: PublicKey
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length -> 256 bytes
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signing_key :: SigningPublicKey
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length -> 128 bytes
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num :: Integer
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length -> 1 byte
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value: 0 <= num <= 6
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leases :: [Lease]
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length -> >= $num*399 bytes
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signature :: Signature
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length -> 40 bytes
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{% endfilter %}
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</pre>
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<h4>Notes</h4>
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<p>
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The signature may be verified using the signing public key of the destination.
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The signing_key is currently unused. It was intended for LeaseSet revocation, which is unimplemented.
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<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/LeaseSet.html">Javadoc</a></h4>
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<h2 id="struct_RouterAddress">RouterAddress</h2>
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<h4>Description</h4>
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<p>
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This structure defines the means to contact a router through a transport protocol.
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|
</p>
|
|
<h4>Contents</h4>
|
|
<p>
|
|
1 byte <a href="#type_Integer">Integer</a> defining the relative cost of using the address, where 0 is free and 255 is expensive, followed by the expiration <a href="#type_Date">Date</a> after which the address should not be used, or if null, the address never expires.
|
|
After that comes a <a href="#type_String">String</a> defining the transport protocol this router address uses. Finally there is a <a href="#type_Mapping">Mapping</a> containing all of the transport specific options necessary to establish the connection, such as
|
|
IP address, port number, email address, URL, etc.
|
|
</p>
|
|
<pre>
|
|
{% filter escape %}
|
|
+----+
|
|
|cost|
|
|
+----+----+----+----+----+----+----+----+
|
|
| expiration |
|
|
+----+----+----+----+--//+----+----+----+
|
|
| transport_style |
|
|
+----+----+----+----+--//+----+----+----+
|
|
| options |
|
|
+----+----+----+----+--//+----+----+----+
|
|
|
|
cost :: Integer
|
|
length -> 1 byte
|
|
|
|
case 0 -> free
|
|
case 255 -> expensive
|
|
|
|
expiration :: Date
|
|
length -> 8 bytes
|
|
|
|
case null -> never expires
|
|
|
|
transport_style :: String
|
|
length -> 1-256 bytes
|
|
|
|
options :: Mapping
|
|
{% endfilter %}
|
|
</pre>
|
|
|
|
<h4>Notes</h4>
|
|
<ul>
|
|
<li>
|
|
Cost is typically 5 or 6 for SSU, and 10 or 11 for NTCP.
|
|
</li><li>
|
|
Expiration is currently unused, always null (all zeroes))
|
|
</li></ul>
|
|
|
|
|
|
<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/RouterAddress.html">Javadoc</a></h4>
|
|
|
|
<h2 id="struct_RouterInfo">RouterInfo</h2>
|
|
<h4>Description</h4>
|
|
<p>
|
|
Defines all of the data that a router wants to publish for the network to see. The <a href="#struct_RouterInfo">RouterInfo</a> is one of two structures stored in the network database(the other being <a href="#struct_LeaseSet">LeaseSet</a>, and is keyed under the SHA256 of
|
|
the contained <a href="#struct_RouterIdentity">RouterIdentity</a>.
|
|
</p>
|
|
<h4>Contents</h4>
|
|
<p>
|
|
<a href="#struct_RouterIdentity">RouterIdentity</a> followed by the <a href="#type_Date">Date</a>, when the entry was published
|
|
</p>
|
|
<pre>
|
|
{% filter escape %}
|
|
+----+----+----+----+----+----+----+----+
|
|
| router_ident |
|
|
+ +
|
|
| |
|
|
~ ~
|
|
|
|
~ ~
|
|
| |
|
|
+----+----+----+----+----+----+----+----+
|
|
| published |
|
|
+----+----+----+----+----+----+----+----+
|
|
|size| RouterAddress 0 |
|
|
+----+ +
|
|
| |
|
|
~ ~
|
|
|
|
~ ~
|
|
| |
|
|
+----+----+----+----+----+----+----+----+
|
|
| RouterAddress 1 |
|
|
+ +
|
|
| |
|
|
~ ~
|
|
~ ~
|
|
|
|
~ ~
|
|
~ ~
|
|
| |
|
|
+----+----+----+----+----+----+----+----+
|
|
| RouterAddress ($size-1) |
|
|
+ +
|
|
| |
|
|
~ ~
|
|
|
|
~ ~
|
|
| |
|
|
+----+----+----+----+-//-+----+----+----+
|
|
|psiz| options |
|
|
+----+----+----+----+-//-+----+----+----+
|
|
| signature |
|
|
+ +
|
|
| |
|
|
+ +
|
|
| |
|
|
+ +
|
|
| |
|
|
+ +
|
|
| |
|
|
+----+----+----+----+----+----+----+----+
|
|
|
|
router_ident :: RouterIdentity
|
|
length -> >= 387 bytes
|
|
|
|
published :: Date
|
|
length -> 8 bytes
|
|
|
|
size :: Integer
|
|
length -> 1 byte
|
|
|
|
addresses :: [RouterAddress]
|
|
length -> >= $size*267 bytes
|
|
|
|
peer_size :: Integer
|
|
length -> 1 byte
|
|
|
|
value -> 0
|
|
|
|
options :: Mapping
|
|
|
|
signature :: Signature
|
|
length -> 40 bytes
|
|
|
|
{% endfilter %}
|
|
</pre>
|
|
|
|
<h4>Notes</h4>
|
|
The peer_size Integer may be followed by a list of that many router hashes.
|
|
This is currently unused. It was intended for a form of restricted routes, which is unimplemented.
|
|
<p>
|
|
The signature may be verified using the signing public key of the router_ident.
|
|
|
|
<h4><a href="http://docs.i2p2.de/javadoc/net/i2p/data/RouterInfo.html">Javadoc</a></h4>
|
|
|
|
|
|
<h2 id="struct_DeliveryInstructions">Delivery Instructions</h2>
|
|
Defined in the <a href="tunnel_message_spec.html#delivery">Tunnel Message Specification</a>.
|
|
|
|
{% endblock %}
|