51 lines
1.2 KiB
Go
51 lines
1.2 KiB
Go
package license
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/sha256"
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"crypto/x509"
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"encoding/base64"
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"encoding/json"
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"encoding/pem"
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"math/big"
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"time"
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)
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var (
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privateKey *ecdsa.PrivateKey
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)
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func init() {
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privateKey, _ = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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}
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func SignPayload(payload []byte) (string, error) {
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hash := sha256.Sum256(payload)
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r, s, err := ecdsa.Sign(rand.Reader, privateKey, hash[:])
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if err != nil {
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return "", err
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}
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sig := append(r.Bytes(), s.Bytes()...)
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return base64.StdEncoding.EncodeToString(sig), nil
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}
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func VerifySignature(pubKey *ecdsa.PublicKey, payload []byte, signature string) bool {
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sigBytes, _ := base64.StdEncoding.DecodeString(signature)
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r := big.Int{}
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s := big.Int{}
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r.SetBytes(sigBytes[:len(sigBytes)/2])
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s.SetBytes(sigBytes[len(sigBytes)/2:])
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hash := sha256.Sum256(payload)
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return ecdsa.Verify(pubKey, hash[:], &r, &s)
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}
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func ExportPublicKeyPEM() string {
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pubKeyBytes, _ := x509.MarshalPKIXPublicKey(&privateKey.PublicKey)
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return string(pem.EncodeToMemory(&pem.Block{Type: "PUBLIC KEY", Bytes: pubKeyBytes}))
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}
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