59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
package signature
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import (
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"crypto/ecdsa"
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"fmt"
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"github.com/nspcc-dev/neofs-api-go/v2/refs"
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crypto "github.com/nspcc-dev/neofs-crypto"
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)
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type cfg struct {
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defaultScheme refs.SignatureScheme
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restrictScheme refs.SignatureScheme
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}
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func defaultCfg() *cfg {
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return &cfg{
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defaultScheme: refs.ECDSA_SHA512,
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restrictScheme: refs.UnspecifiedScheme,
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}
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}
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func verify(cfg *cfg, data []byte, sig *refs.Signature) error {
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scheme := sig.GetScheme()
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if scheme == refs.UnspecifiedScheme {
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scheme = cfg.defaultScheme
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}
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if cfg.restrictScheme != refs.UnspecifiedScheme && scheme != cfg.restrictScheme {
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return fmt.Errorf("%w: unexpected signature scheme", crypto.ErrInvalidSignature)
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}
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pub := crypto.UnmarshalPublicKey(sig.GetKey())
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switch scheme {
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case refs.ECDSA_SHA512:
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return crypto.Verify(pub, data, sig.GetSign())
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case refs.ECDSA_RFC6979_SHA256:
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return crypto.VerifyRFC6979(pub, data, sig.GetSign())
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default:
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return crypto.ErrInvalidSignature
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}
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}
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func sign(cfg *cfg, scheme refs.SignatureScheme, key *ecdsa.PrivateKey, data []byte) ([]byte, error) {
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switch scheme {
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case refs.ECDSA_SHA512:
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return crypto.Sign(key, data)
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case refs.ECDSA_RFC6979_SHA256:
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return crypto.SignRFC6979(key, data)
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default:
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panic("unsupported scheme")
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}
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}
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func SignWithRFC6979() SignOption {
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return func(c *cfg) {
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c.defaultScheme = refs.ECDSA_RFC6979_SHA256
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c.restrictScheme = refs.ECDSA_RFC6979_SHA256
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}
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}
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