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author | 2025-03-09 17:47:56 +0100 | |
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committer | 2025-03-10 01:59:49 +0100 | |
commit | 3ac1ee16f377d31a0fb80c8dae28b6239ac4229e (patch) | |
tree | f61faa581feaaeaba2542b9f2b8234a590684413 /vendor/golang.org/x/crypto/sha3/shake.go | |
parent | [chore] update URLs to forked source (diff) | |
download | gotosocial-3ac1ee16f377d31a0fb80c8dae28b6239ac4229e.tar.xz |
[chore] remove vendor
Diffstat (limited to 'vendor/golang.org/x/crypto/sha3/shake.go')
-rw-r--r-- | vendor/golang.org/x/crypto/sha3/shake.go | 193 |
1 files changed, 0 insertions, 193 deletions
diff --git a/vendor/golang.org/x/crypto/sha3/shake.go b/vendor/golang.org/x/crypto/sha3/shake.go deleted file mode 100644 index a6b3a4281..000000000 --- a/vendor/golang.org/x/crypto/sha3/shake.go +++ /dev/null @@ -1,193 +0,0 @@ -// Copyright 2014 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package sha3 - -// This file defines the ShakeHash interface, and provides -// functions for creating SHAKE and cSHAKE instances, as well as utility -// functions for hashing bytes to arbitrary-length output. -// -// -// SHAKE implementation is based on FIPS PUB 202 [1] -// cSHAKE implementations is based on NIST SP 800-185 [2] -// -// [1] https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf -// [2] https://doi.org/10.6028/NIST.SP.800-185 - -import ( - "bytes" - "encoding/binary" - "errors" - "hash" - "io" - "math/bits" -) - -// ShakeHash defines the interface to hash functions that support -// arbitrary-length output. When used as a plain [hash.Hash], it -// produces minimum-length outputs that provide full-strength generic -// security. -type ShakeHash interface { - hash.Hash - - // Read reads more output from the hash; reading affects the hash's - // state. (ShakeHash.Read is thus very different from Hash.Sum) - // It never returns an error, but subsequent calls to Write or Sum - // will panic. - io.Reader - - // Clone returns a copy of the ShakeHash in its current state. - Clone() ShakeHash -} - -// cSHAKE specific context -type cshakeState struct { - *state // SHA-3 state context and Read/Write operations - - // initBlock is the cSHAKE specific initialization set of bytes. It is initialized - // by newCShake function and stores concatenation of N followed by S, encoded - // by the method specified in 3.3 of [1]. - // It is stored here in order for Reset() to be able to put context into - // initial state. - initBlock []byte -} - -func bytepad(data []byte, rate int) []byte { - out := make([]byte, 0, 9+len(data)+rate-1) - out = append(out, leftEncode(uint64(rate))...) - out = append(out, data...) - if padlen := rate - len(out)%rate; padlen < rate { - out = append(out, make([]byte, padlen)...) - } - return out -} - -func leftEncode(x uint64) []byte { - // Let n be the smallest positive integer for which 2^(8n) > x. - n := (bits.Len64(x) + 7) / 8 - if n == 0 { - n = 1 - } - // Return n || x with n as a byte and x an n bytes in big-endian order. - b := make([]byte, 9) - binary.BigEndian.PutUint64(b[1:], x) - b = b[9-n-1:] - b[0] = byte(n) - return b -} - -func newCShake(N, S []byte, rate, outputLen int, dsbyte byte) ShakeHash { - c := cshakeState{state: &state{rate: rate, outputLen: outputLen, dsbyte: dsbyte}} - c.initBlock = make([]byte, 0, 9+len(N)+9+len(S)) // leftEncode returns max 9 bytes - c.initBlock = append(c.initBlock, leftEncode(uint64(len(N))*8)...) - c.initBlock = append(c.initBlock, N...) - c.initBlock = append(c.initBlock, leftEncode(uint64(len(S))*8)...) - c.initBlock = append(c.initBlock, S...) - c.Write(bytepad(c.initBlock, c.rate)) - return &c -} - -// Reset resets the hash to initial state. -func (c *cshakeState) Reset() { - c.state.Reset() - c.Write(bytepad(c.initBlock, c.rate)) -} - -// Clone returns copy of a cSHAKE context within its current state. -func (c *cshakeState) Clone() ShakeHash { - b := make([]byte, len(c.initBlock)) - copy(b, c.initBlock) - return &cshakeState{state: c.clone(), initBlock: b} -} - -// Clone returns copy of SHAKE context within its current state. -func (c *state) Clone() ShakeHash { - return c.clone() -} - -func (c *cshakeState) MarshalBinary() ([]byte, error) { - return c.AppendBinary(make([]byte, 0, marshaledSize+len(c.initBlock))) -} - -func (c *cshakeState) AppendBinary(b []byte) ([]byte, error) { - b, err := c.state.AppendBinary(b) - if err != nil { - return nil, err - } - b = append(b, c.initBlock...) - return b, nil -} - -func (c *cshakeState) UnmarshalBinary(b []byte) error { - if len(b) <= marshaledSize { - return errors.New("sha3: invalid hash state") - } - if err := c.state.UnmarshalBinary(b[:marshaledSize]); err != nil { - return err - } - c.initBlock = bytes.Clone(b[marshaledSize:]) - return nil -} - -// NewShake128 creates a new SHAKE128 variable-output-length ShakeHash. -// Its generic security strength is 128 bits against all attacks if at -// least 32 bytes of its output are used. -func NewShake128() ShakeHash { - return newShake128() -} - -// NewShake256 creates a new SHAKE256 variable-output-length ShakeHash. -// Its generic security strength is 256 bits against all attacks if -// at least 64 bytes of its output are used. -func NewShake256() ShakeHash { - return newShake256() -} - -func newShake128Generic() *state { - return &state{rate: rateK256, outputLen: 32, dsbyte: dsbyteShake} -} - -func newShake256Generic() *state { - return &state{rate: rateK512, outputLen: 64, dsbyte: dsbyteShake} -} - -// NewCShake128 creates a new instance of cSHAKE128 variable-output-length ShakeHash, -// a customizable variant of SHAKE128. -// N is used to define functions based on cSHAKE, it can be empty when plain cSHAKE is -// desired. S is a customization byte string used for domain separation - two cSHAKE -// computations on same input with different S yield unrelated outputs. -// When N and S are both empty, this is equivalent to NewShake128. -func NewCShake128(N, S []byte) ShakeHash { - if len(N) == 0 && len(S) == 0 { - return NewShake128() - } - return newCShake(N, S, rateK256, 32, dsbyteCShake) -} - -// NewCShake256 creates a new instance of cSHAKE256 variable-output-length ShakeHash, -// a customizable variant of SHAKE256. -// N is used to define functions based on cSHAKE, it can be empty when plain cSHAKE is -// desired. S is a customization byte string used for domain separation - two cSHAKE -// computations on same input with different S yield unrelated outputs. -// When N and S are both empty, this is equivalent to NewShake256. -func NewCShake256(N, S []byte) ShakeHash { - if len(N) == 0 && len(S) == 0 { - return NewShake256() - } - return newCShake(N, S, rateK512, 64, dsbyteCShake) -} - -// ShakeSum128 writes an arbitrary-length digest of data into hash. -func ShakeSum128(hash, data []byte) { - h := NewShake128() - h.Write(data) - h.Read(hash) -} - -// ShakeSum256 writes an arbitrary-length digest of data into hash. -func ShakeSum256(hash, data []byte) { - h := NewShake256() - h.Write(data) - h.Read(hash) -} |