mirror of
https://github.com/lwch/natpass.git
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44 lines
686 B
Go
44 lines
686 B
Go
package hash
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import (
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"crypto/hmac"
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"crypto/sha512"
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"encoding/binary"
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"hash"
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"math"
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"sync"
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"time"
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)
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// Hasher hasher for handshake
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type Hasher struct {
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sync.Mutex
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period uint
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h hash.Hash
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}
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// New create hasher
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func New(secret string, period uint) *Hasher {
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if period == 0 {
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period = 30
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}
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return &Hasher{
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period: period,
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h: hmac.New(sha512.New, []byte(secret)),
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}
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}
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// Hash hash func
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func (h *Hasher) Hash() []byte {
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now := time.Now()
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i := math.Floor(float64(now.Unix()) / float64(h.period))
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var buf [8]byte
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binary.BigEndian.PutUint64(buf[:], uint64(i))
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h.Lock()
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defer h.Unlock()
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h.h.Reset()
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h.h.Write(buf[:])
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ret := h.h.Sum(nil)
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return ret
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}
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