github.com/cloudflare/circl@v1.5.0/internal/sha3/doc.go (about)

     1  // Copyright 2014 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // Package sha3 implements the SHA-3 fixed-output-length hash functions and
     6  // the SHAKE variable-output-length hash functions defined by FIPS-202.
     7  //
     8  // Both types of hash function use the "sponge" construction and the Keccak
     9  // permutation. For a detailed specification see http://keccak.noekeon.org/
    10  //
    11  // # Guidance
    12  //
    13  // If you aren't sure what function you need, use SHAKE256 with at least 64
    14  // bytes of output. The SHAKE instances are faster than the SHA3 instances;
    15  // the latter have to allocate memory to conform to the hash.Hash interface.
    16  //
    17  // If you need a secret-key MAC (message authentication code), prepend the
    18  // secret key to the input, hash with SHAKE256 and read at least 32 bytes of
    19  // output.
    20  //
    21  // # Security strengths
    22  //
    23  // The SHA3-x (x equals 224, 256, 384, or 512) functions have a security
    24  // strength against preimage attacks of x bits. Since they only produce "x"
    25  // bits of output, their collision-resistance is only "x/2" bits.
    26  //
    27  // The SHAKE-256 and -128 functions have a generic security strength of 256 and
    28  // 128 bits against all attacks, provided that at least 2x bits of their output
    29  // is used.  Requesting more than 64 or 32 bytes of output, respectively, does
    30  // not increase the collision-resistance of the SHAKE functions.
    31  //
    32  // # The sponge construction
    33  //
    34  // A sponge builds a pseudo-random function from a public pseudo-random
    35  // permutation, by applying the permutation to a state of "rate + capacity"
    36  // bytes, but hiding "capacity" of the bytes.
    37  //
    38  // A sponge starts out with a zero state. To hash an input using a sponge, up
    39  // to "rate" bytes of the input are XORed into the sponge's state. The sponge
    40  // is then "full" and the permutation is applied to "empty" it. This process is
    41  // repeated until all the input has been "absorbed". The input is then padded.
    42  // The digest is "squeezed" from the sponge in the same way, except that output
    43  // is copied out instead of input being XORed in.
    44  //
    45  // A sponge is parameterized by its generic security strength, which is equal
    46  // to half its capacity; capacity + rate is equal to the permutation's width.
    47  // Since the KeccakF-1600 permutation is 1600 bits (200 bytes) wide, this means
    48  // that the security strength of a sponge instance is equal to (1600 - bitrate) / 2.
    49  //
    50  // # Recommendations
    51  //
    52  // The SHAKE functions are recommended for most new uses. They can produce
    53  // output of arbitrary length. SHAKE256, with an output length of at least
    54  // 64 bytes, provides 256-bit security against all attacks.  The Keccak team
    55  // recommends it for most applications upgrading from SHA2-512. (NIST chose a
    56  // much stronger, but much slower, sponge instance for SHA3-512.)
    57  //
    58  // The SHA-3 functions are "drop-in" replacements for the SHA-2 functions.
    59  // They produce output of the same length, with the same security strengths
    60  // against all attacks. This means, in particular, that SHA3-256 only has
    61  // 128-bit collision resistance, because its output length is 32 bytes.
    62  package sha3