77 lines
2.3 KiB
Go
77 lines
2.3 KiB
Go
package frostfsecdsa
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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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"crypto/sha512"
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frostfscrypto "github.com/TrueCloudLab/frostfs-sdk-go/crypto"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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)
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// Signer wraps ecdsa.PrivateKey and represents signer based on ECDSA with
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// SHA-512 hashing. Provides frostfscrypto.Signer interface.
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//
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// Instances MUST be initialized from ecdsa.PrivateKey using type conversion.
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type Signer ecdsa.PrivateKey
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// Scheme returns frostfscrypto.ECDSA_SHA512.
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// Implements frostfscrypto.Signer.
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func (x Signer) Scheme() frostfscrypto.Scheme {
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return frostfscrypto.ECDSA_SHA512
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}
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// Sign signs data using ECDSA algorithm with SHA-512 hashing.
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// Implements frostfscrypto.Signer.
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func (x Signer) Sign(data []byte) ([]byte, error) {
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h := sha512.Sum512(data)
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r, s, err := ecdsa.Sign(rand.Reader, (*ecdsa.PrivateKey)(&x), h[:])
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if err != nil {
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return nil, err
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}
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params := elliptic.P256().Params()
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curveOrderByteSize := params.P.BitLen() / 8
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buf := make([]byte, 1+curveOrderByteSize*2)
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buf[0] = 4
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_ = r.FillBytes(buf[1 : 1+curveOrderByteSize])
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_ = s.FillBytes(buf[1+curveOrderByteSize:])
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return buf, nil
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}
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// Public initializes PublicKey and returns it as frostfscrypto.PublicKey.
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// Implements frostfscrypto.Signer.
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func (x Signer) Public() frostfscrypto.PublicKey {
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return (*PublicKey)(&x.PublicKey)
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}
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// SignerRFC6979 wraps ecdsa.PrivateKey and represents signer based on deterministic
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// ECDSA with SHA-256 hashing (RFC 6979). Provides frostfscrypto.Signer interface.
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//
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// Instances SHOULD be initialized from ecdsa.PrivateKey using type conversion.
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type SignerRFC6979 ecdsa.PrivateKey
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// Scheme returns frostfscrypto.ECDSA_DETERMINISTIC_SHA256.
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// Implements frostfscrypto.Signer.
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func (x SignerRFC6979) Scheme() frostfscrypto.Scheme {
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return frostfscrypto.ECDSA_DETERMINISTIC_SHA256
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}
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// Sign signs data using deterministic ECDSA algorithm with SHA-256 hashing.
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// Implements frostfscrypto.Signer.
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//
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// See also RFC 6979.
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func (x SignerRFC6979) Sign(data []byte) ([]byte, error) {
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p := keys.PrivateKey{PrivateKey: (ecdsa.PrivateKey)(x)}
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return p.Sign(data), nil
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}
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// Public initializes PublicKeyRFC6979 and returns it as frostfscrypto.PublicKey.
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// Implements frostfscrypto.Signer.
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func (x SignerRFC6979) Public() frostfscrypto.PublicKey {
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return (*PublicKeyRFC6979)(&x.PublicKey)
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}
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