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author | Christopher Speller <crspeller@gmail.com> | 2018-04-16 05:37:14 -0700 |
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committer | Joram Wilander <jwawilander@gmail.com> | 2018-04-16 08:37:14 -0400 |
commit | 6e2cb00008cbf09e556b00f87603797fcaa47e09 (patch) | |
tree | 3c0eb55ff4226a3f024aad373140d1fb860a6404 /vendor/golang.org/x/crypto/hkdf/hkdf.go | |
parent | bf24f51c4e1cc6286885460672f7f449e8c6f5ef (diff) | |
download | chat-6e2cb00008cbf09e556b00f87603797fcaa47e09.tar.gz chat-6e2cb00008cbf09e556b00f87603797fcaa47e09.tar.bz2 chat-6e2cb00008cbf09e556b00f87603797fcaa47e09.zip |
Depenancy upgrades and movign to dep. (#8630)
Diffstat (limited to 'vendor/golang.org/x/crypto/hkdf/hkdf.go')
-rw-r--r-- | vendor/golang.org/x/crypto/hkdf/hkdf.go | 75 |
1 files changed, 0 insertions, 75 deletions
diff --git a/vendor/golang.org/x/crypto/hkdf/hkdf.go b/vendor/golang.org/x/crypto/hkdf/hkdf.go deleted file mode 100644 index 5bc246355..000000000 --- a/vendor/golang.org/x/crypto/hkdf/hkdf.go +++ /dev/null @@ -1,75 +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 hkdf implements the HMAC-based Extract-and-Expand Key Derivation -// Function (HKDF) as defined in RFC 5869. -// -// HKDF is a cryptographic key derivation function (KDF) with the goal of -// expanding limited input keying material into one or more cryptographically -// strong secret keys. -// -// RFC 5869: https://tools.ietf.org/html/rfc5869 -package hkdf // import "golang.org/x/crypto/hkdf" - -import ( - "crypto/hmac" - "errors" - "hash" - "io" -) - -type hkdf struct { - expander hash.Hash - size int - - info []byte - counter byte - - prev []byte - cache []byte -} - -func (f *hkdf) Read(p []byte) (int, error) { - // Check whether enough data can be generated - need := len(p) - remains := len(f.cache) + int(255-f.counter+1)*f.size - if remains < need { - return 0, errors.New("hkdf: entropy limit reached") - } - // Read from the cache, if enough data is present - n := copy(p, f.cache) - p = p[n:] - - // Fill the buffer - for len(p) > 0 { - f.expander.Reset() - f.expander.Write(f.prev) - f.expander.Write(f.info) - f.expander.Write([]byte{f.counter}) - f.prev = f.expander.Sum(f.prev[:0]) - f.counter++ - - // Copy the new batch into p - f.cache = f.prev - n = copy(p, f.cache) - p = p[n:] - } - // Save leftovers for next run - f.cache = f.cache[n:] - - return need, nil -} - -// New returns a new HKDF using the given hash, the secret keying material to expand -// and optional salt and info fields. -func New(hash func() hash.Hash, secret, salt, info []byte) io.Reader { - if salt == nil { - salt = make([]byte, hash().Size()) - } - extractor := hmac.New(hash, salt) - extractor.Write(secret) - prk := extractor.Sum(nil) - - return &hkdf{hmac.New(hash, prk), extractor.Size(), info, 1, nil, nil} -} |