39 lines
918 B
Go
39 lines
918 B
Go
package util
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import (
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"codeup.aliyun.com/lsxd/backend_deveoper/gmutil/sm2/model"
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"crypto/elliptic"
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"crypto/x509/pkix"
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"encoding/asn1"
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"fmt"
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"reflect"
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)
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var (
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oidNamedCurveP256SM2 = asn1.ObjectIdentifier{1, 2, 156, 10197, 1, 301} // I get the SM2 ID through parsing the pem file generated by gmssl
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)
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// PKIXPublicKey reflects a PKIX public key structure. See SubjectPublicKeyInfo
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// in RFC 3280.
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type PKIXPublicKey struct {
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Algo pkix.AlgorithmIdentifier
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BitString asn1.BitString
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}
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func ParsePublicKey(bytes []byte) (*model.PublicKey, error) {
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var pk PKIXPublicKey
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if _, err := asn1.Unmarshal(bytes, &pk); err != nil {
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return nil, err
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}
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if !reflect.DeepEqual(pk.Algo.Algorithm, oidSM2) {
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return nil, fmt.Errorf("not sm2 elliptic curve")
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}
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curve := NewP256Sm2()
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x, y := elliptic.Unmarshal(curve, pk.BitString.Bytes)
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return &model.PublicKey{
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Curve: curve,
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X: x,
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Y: y,
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}, nil
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}
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