103 lines
2.3 KiB
Go
103 lines
2.3 KiB
Go
package frostfscrypto
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import (
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"errors"
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"fmt"
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"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
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)
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// Signature represents a confirmation of data integrity received by the
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// digital signature mechanism.
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//
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// Signature is mutually compatible with git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs.Signature
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// message. See ReadFromV2 / WriteToV2 methods.
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//
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// Note that direct typecast is not safe and may result in loss of compatibility:
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//
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// _ = Signature(refs.Signature{}) // not recommended
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type Signature refs.Signature
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// ReadFromV2 reads Signature from the refs.Signature message. Checks if the
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// message conforms to FrostFS API V2 protocol.
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//
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// See also WriteToV2.
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func (x *Signature) ReadFromV2(m refs.Signature) error {
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if len(m.GetKey()) == 0 {
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return errors.New("missing public key")
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} else if len(m.GetSign()) == 0 {
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return errors.New("missing signature")
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}
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switch m.GetScheme() {
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default:
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return fmt.Errorf("unsupported scheme %v", m.GetSign())
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case
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refs.ECDSA_SHA512,
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refs.ECDSA_RFC6979_SHA256,
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refs.ECDSA_RFC6979_SHA256_WALLET_CONNECT:
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}
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*x = Signature(m)
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return nil
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}
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// WriteToV2 writes Signature to the refs.Signature message.
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// The message must not be nil.
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//
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// See also ReadFromV2.
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func (x Signature) WriteToV2(m *refs.Signature) {
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*m = (refs.Signature)(x)
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}
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// Calculate signs data using Signer and encodes public key for subsequent
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// verification.
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//
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// Signer MUST NOT be nil.
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//
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// See also Verify.
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func (x *Signature) Calculate(signer Signer, data []byte) error {
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signature, err := signer.Sign(data)
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if err != nil {
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return fmt.Errorf("signer %T failure: %w", signer, err)
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}
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pub := signer.Public()
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key := make([]byte, pub.MaxEncodedSize())
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key = key[:pub.Encode(key)]
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m := (*refs.Signature)(x)
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m.SetScheme(refs.SignatureScheme(signer.Scheme()))
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m.SetSign(signature)
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m.SetKey(key)
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return nil
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}
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// Verify verifies data signature using encoded public key. True means valid
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// signature.
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//
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// Verify fails if signature scheme is not supported (see RegisterScheme).
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//
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// See also Calculate.
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func (x Signature) Verify(data []byte) bool {
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m := (*refs.Signature)(&x)
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f, ok := publicKeys[Scheme(m.GetScheme())]
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if !ok {
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return false
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}
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key := f()
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err := key.Decode(m.GetKey())
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if err != nil {
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return false
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}
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return key.Verify(data, m.GetSign())
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}
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