2 releases
0.1.16-alpha.0 | Apr 1, 2023 |
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0.1.12-alpha.0 | Jan 19, 2023 |
#308 in #hashing
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Used in 33 crates
(3 directly)
280KB
780 lines
bitcoin-muhash
The bitcoin-muhash
crate is a Rust
implementation of the MuHash3072 hash function,
which is used as a component of the Bitcoin
system. This crate is part of a direct translation
of the Bitcoin codebase from C++ to Rust, and is
currently in the process of translation. Please
note that some function bodies may still be in the
process of being translated.
MuHash3072 is a hash function that takes an input message and produces a 3072-bit hash output. This hash function is used by the Bitcoin system for various purposes, including block validation and transaction verification.
The bitcoin-muhash
crate provides Rust
implementations of various functions related to
the MuHash3072 hash function, including insert
,
remove
, multiply
, square
, to_bytes
, and
many others. The crate also includes
implementations of several mathematical operations
such as multiplication, division, and reduction,
which are used in the computation of the hash
function.
While there may not be any specific mathematical
equations or concepts involved in the
bitcoin-muhash
crate, the crate provides
efficient implementations of various arithmetic
operations that are essential for the computation
of the MuHash3072 hash function.
Note that this crate is currently in the process of translation, and some function bodies may still be incomplete or subject to change.
19> thanks -- could you tell me about MuHash3072?
Sure, MuHash3072 is a hash function that is used as a component of the Bitcoin system. It was originally introduced in 2011 by the Bitcoin developer Jeff Garzik, and has since been widely adopted as a standard component of the Bitcoin software stack.
The MuHash3072 hash function is designed to produce a 3072-bit hash output from an input message of arbitrary length. It is based on the MurmurHash3 algorithm, which is a high-performance, non-cryptographic hash function that is widely used in software engineering and data processing applications.
MuHash3072 uses a combination of bit-shifting, XOR, and other bitwise operations to generate the hash output. It also makes use of a number of multiplication and reduction operations to ensure that the output is uniformly distributed across the entire 3072-bit output space.
In the Bitcoin system, the MuHash3072 hash function is used for various purposes, including block validation, transaction verification, and the generation of unique identifiers for various system components. It is considered to be a fast and efficient hash function that provides a good balance between performance and security for these applications.
20> what is a Num3072
Num3072
is likely a data type or structure used
in the bitcoin-muhash
crate to represent
a 3072-bit integer or array of integers. It is
possible that this data type is defined as a Rust
struct, with various methods and operators defined
to implement arithmetic operations on 3072-bit
integers.
The exact implementation of the Num3072
type may
vary depending on the specific needs and
requirements of the bitcoin-muhash
crate. However, it is likely to be a fundamental
building block of the MuHash3072 hash function, as
this function requires the manipulation of large,
fixed-length integers in order to generate the
3072-bit hash output.
In general, working with large integers can be
computationally intensive, as these operations
typically require multiple bit-wise and arithmetic
operations. However, by defining a custom data
type like Num3072
, the bitcoin-muhash
crate
can provide efficient implementations of these
operations that are tailored to the specific needs
of the MuHash3072 hash function.
21> why do we use this many bits?
The reason for using a 3072-bit hash output in the MuHash3072 hash function, and in the Bitcoin system more generally, is primarily to enhance security and resistance to attacks.
In general, longer hash outputs are considered to be more secure, as they provide a larger output space for the hash function, making it more difficult for attackers to find collisions (i.e. different input messages that produce the same hash output). With a longer hash output, the probability of two different input messages producing the same hash output is reduced.
In the case of Bitcoin, the 3072-bit hash output is used to ensure the security and integrity of various system components, including transaction verification and block validationk. By using a longer hash output, Bitcoin is able to provide a high level of security and protection against attacks, which is essential for maintaining the trust and reliability of the system.
It's worth noting that the exact choice of hash output size in Bitcoin, and in other cryptographic systems, is typically based on a combination of factors, including the desired level of security, the computational resources available for hashing operations, and the constraints imposed by the system architecture.
22> what about a limb? what is a limb?
In computer science and cryptography, a "limb" typically refers to a fixed-width integer type that is used to represent a portion of a larger, variable-length integer.
For example, in the context of the
bitcoin-muhash
crate, a "limb" may be
a fixed-width integer type that is used to
represent a portion of a 3072-bit integer. In
general, the size of a limb is chosen to be
a power of 2, such as 32 bits or 64 bits, in order
to facilitate efficient bit-wise and arithmetic
operations.
Using a fixed-width limb size can simplify the implementation of arithmetic operationsk on large integers, as each limb can be treated as a separate unit that can be processed independently. This can help to improve performance and reduce the complexity of the code.
The specific size and implementation of limbs may
vary depending on the specific needs and
requirements of the bitcoin-muhash
crate, as
well as the underlying hardware architecture of
the system. However, the use of limbs is a common
technique in cryptography and computer science for
working with large, variable-length integers.
Dependencies
~88MB
~848K SLoC