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[bytom/vapor.git] / vendor / golang.org / x / crypto / pbkdf2 / pbkdf2.go

diff --git a/vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go b/vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go
deleted file mode 100644 (file)
index 593f653..0000000
--- a/vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go
+++ /dev/null
@@ -1,77 +0,0 @@
-// Copyright 2012 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 pbkdf2 implements the key derivation function PBKDF2 as defined in RFC
-2898 / PKCS #5 v2.0.
-
-A key derivation function is useful when encrypting data based on a password
-or any other not-fully-random data. It uses a pseudorandom function to derive
-a secure encryption key based on the password.
-
-While v2.0 of the standard defines only one pseudorandom function to use,
-HMAC-SHA1, the drafted v2.1 specification allows use of all five FIPS Approved
-Hash Functions SHA-1, SHA-224, SHA-256, SHA-384 and SHA-512 for HMAC. To
-choose, you can pass the `New` functions from the different SHA packages to
-pbkdf2.Key.
-*/
-package pbkdf2 // import "golang.org/x/crypto/pbkdf2"
-
-import (
-       "crypto/hmac"
-       "hash"
-)
-
-// Key derives a key from the password, salt and iteration count, returning a
-// []byte of length keylen that can be used as cryptographic key. The key is
-// derived based on the method described as PBKDF2 with the HMAC variant using
-// the supplied hash function.
-//
-// For example, to use a HMAC-SHA-1 based PBKDF2 key derivation function, you
-// can get a derived key for e.g. AES-256 (which needs a 32-byte key) by
-// doing:
-//
-//     dk := pbkdf2.Key([]byte("some password"), salt, 4096, 32, sha1.New)
-//
-// Remember to get a good random salt. At least 8 bytes is recommended by the
-// RFC.
-//
-// Using a higher iteration count will increase the cost of an exhaustive
-// search but will also make derivation proportionally slower.
-func Key(password, salt []byte, iter, keyLen int, h func() hash.Hash) []byte {
-       prf := hmac.New(h, password)
-       hashLen := prf.Size()
-       numBlocks := (keyLen + hashLen - 1) / hashLen
-
-       var buf [4]byte
-       dk := make([]byte, 0, numBlocks*hashLen)
-       U := make([]byte, hashLen)
-       for block := 1; block <= numBlocks; block++ {
-               // N.B.: || means concatenation, ^ means XOR
-               // for each block T_i = U_1 ^ U_2 ^ ... ^ U_iter
-               // U_1 = PRF(password, salt || uint(i))
-               prf.Reset()
-               prf.Write(salt)
-               buf[0] = byte(block >> 24)
-               buf[1] = byte(block >> 16)
-               buf[2] = byte(block >> 8)
-               buf[3] = byte(block)
-               prf.Write(buf[:4])
-               dk = prf.Sum(dk)
-               T := dk[len(dk)-hashLen:]
-               copy(U, T)
-
-               // U_n = PRF(password, U_(n-1))
-               for n := 2; n <= iter; n++ {
-                       prf.Reset()
-                       prf.Write(U)
-                       U = U[:0]
-                       U = prf.Sum(U)
-                       for x := range U {
-                               T[x] ^= U[x]
-                       }
-               }
-       }
-       return dk[:keyLen]
-}