44 lines
705 B
Go
44 lines
705 B
Go
package auth
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import (
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"crypto/hmac"
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"crypto/sha1"
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"encoding/hex"
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"fmt"
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)
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type (
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hmacSigner struct {
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secret []byte
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}
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)
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const (
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hmacSumStringLength = 40
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)
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var (
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DefaultSigner Signer
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)
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func HmacSigner(secret string) *hmacSigner {
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return &hmacSigner{
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secret: []byte(secret),
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}
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}
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func (s hmacSigner) Sign(userID uint64, pp ...interface{}) string {
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h := hmac.New(sha1.New, s.secret)
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fmt.Fprintf(h, "%d ", userID)
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for _, part := range pp {
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fmt.Fprintf(h, "%v ", part)
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}
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return hex.EncodeToString(h.Sum(nil))
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}
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func (s hmacSigner) Verify(signature string, userID uint64, pp ...interface{}) bool {
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return len(signature) == hmacSumStringLength && signature == s.Sign(userID, pp...)
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}
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