113 lines
2.6 KiB
Go
113 lines
2.6 KiB
Go
package crypto
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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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"encoding/base64"
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"encoding/json"
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"fmt"
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"math/big"
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)
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type JWK struct {
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Kty string `json:"kty"`
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Crv string `json:"crv"`
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D string `json:"d"`
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X string `json:"x"`
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Y string `json:"y"`
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Ext bool `json:"ext"`
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KeyOps []string `json:"key_ops"`
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PrivateBytes []byte `json:"privateBytes,omitempty"`
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}
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// Returns a byte slice containing the JWK and an error if the generation or export failed.
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func (t *JWK) Marshal() ([]byte, error) {
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JWKJSON, err := json.Marshal(t)
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if err != nil {
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fmt.Printf("Failed to marshal JWK: %v", err)
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return nil, err
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}
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fmt.Printf("%s\n", JWKJSON)
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return JWKJSON, err
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}
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func (t *JWK) PrivKeyB64Bytes() ([]byte, error) {
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decodedPrivateKey, err2 := Base64Decode(t.D)
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return decodedPrivateKey, err2
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}
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func (t *JWK) ExtractPublicKeyDetails(pubKey []byte) *JWK {
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x := EncodeBase64(pubKey[1:33])
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y := EncodeBase64(pubKey[33:])
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return &JWK{
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Kty: "EC",
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Crv: "P-256",
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X: x,
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Y: y,
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}
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}
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func (t *JWK) DecompressPubkey() (*ecdsa.PublicKey, error) {
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xBytes, err := base64.RawURLEncoding.DecodeString(t.X)
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if err != nil {
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return nil, err
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}
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yBytes, err := base64.RawURLEncoding.DecodeString(t.Y)
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if err != nil {
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return nil, err
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}
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x := new(big.Int).SetBytes(xBytes)
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y := new(big.Int).SetBytes(yBytes)
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pubKey := &ecdsa.PublicKey{
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Curve: elliptic.P256(),
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X: x,
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Y: y,
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}
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return pubKey, nil
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}
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func (t *JWK) UncompressPubKey() ([]byte, error) {
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xBytes, err := base64.RawURLEncoding.DecodeString(t.X)
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if err != nil {
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return nil, err
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}
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yBytes, err := base64.RawURLEncoding.DecodeString(t.Y)
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if err != nil {
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return nil, err
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}
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x := new(big.Int).SetBytes(xBytes)
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y := new(big.Int).SetBytes(yBytes)
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pubKey := &ecdsa.PublicKey{
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Curve: elliptic.P256(),
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X: x,
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Y: y,
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}
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uncompressedPubKey := elliptic.Marshal(pubKey.Curve, pubKey.X, pubKey.Y)
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return uncompressedPubKey, nil
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}
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// GenerateECDSA_P256_JWK generates a new ECDSA private key with P-256 curve
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func GenerateECDSA_P256_JWK() (*JWK, error) {
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privKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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if err != nil {
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fmt.Printf("Failed to generate private key: %v", err)
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return nil, err
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}
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JWK := &JWK{
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Kty: "EC",
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Crv: "P-256",
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D: base64.RawURLEncoding.EncodeToString(privKey.D.Bytes()),
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X: base64.RawURLEncoding.EncodeToString(privKey.X.Bytes()),
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Y: base64.RawURLEncoding.EncodeToString(privKey.Y.Bytes()),
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Ext: true,
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KeyOps: []string{"sign"},
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}
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return JWK, nil
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}
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