05caa959c4
* Make verifiers composable * fix: remove unused code and improve signature verification logic * fix: simplify abstractions and renamed some things * fix: improve tl interface. * fix: sort out signer/verifier
81 lines
1.8 KiB
Go
81 lines
1.8 KiB
Go
package signerverifier
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import (
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"context"
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"crypto"
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"crypto/ecdsa"
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"crypto/rand"
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"fmt"
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"github.com/docker/attest/internal/util"
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"github.com/secure-systems-lab/go-securesystemslib/dsse"
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)
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type ecdsaVerifier struct {
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publicKey *ecdsa.PublicKey
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keyID string
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}
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// ensure ECDSAVerifier implements dsse.Verifier.
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var _ dsse.Verifier = (*ecdsaVerifier)(nil)
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func NewECDSAVerifier(publicKey crypto.PublicKey) (dsse.Verifier, error) {
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ecdsaPublicKey, ok := (publicKey).(*ecdsa.PublicKey)
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if !ok {
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return nil, fmt.Errorf("public key is not an ECDSA public key")
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}
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return &ecdsaVerifier{
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publicKey: ecdsaPublicKey,
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}, nil
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}
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func (v *ecdsaVerifier) Verify(_ context.Context, data, signature []byte) error {
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// verify payload ecdsa signature
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ok := ecdsa.VerifyASN1(v.publicKey, util.SHA256(data), signature)
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if !ok {
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return fmt.Errorf("payload signature is not valid")
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}
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return nil
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}
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func (v *ecdsaVerifier) Public() crypto.PublicKey {
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return v.publicKey
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}
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func (v *ecdsaVerifier) KeyID() (string, error) {
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if v.keyID != "" {
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return v.keyID, nil
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}
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keyID, err := KeyID(v.publicKey)
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if err != nil {
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return "", fmt.Errorf("failed to get key ID: %w", err)
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}
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v.keyID = keyID
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return v.keyID, nil
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}
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// must implement dsse.SignerVerifier interface.
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var _ dsse.SignerVerifier = (*ecdsa256SignerVerifier)(nil)
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type ecdsa256SignerVerifier struct {
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signer crypto.Signer
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dsse.Verifier
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}
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func NewECDSASignerVerifier(signer crypto.Signer) (dsse.SignerVerifier, error) {
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verifier, err := NewECDSAVerifier(signer.Public())
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if err != nil {
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return nil, fmt.Errorf("failed to create verifier: %w", err)
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}
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sv := &ecdsa256SignerVerifier{
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signer: signer,
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Verifier: verifier,
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}
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return sv, nil
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}
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func (s *ecdsa256SignerVerifier) Sign(_ context.Context, data []byte) ([]byte, error) {
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return s.signer.Sign(rand.Reader, data, crypto.SHA256)
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}
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