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Merge pull request #36 from tablelandnetwork/dtb/signer-lib
feat: signing pkg for programmatic access
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| package signing | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "crypto/ecdsa" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
|
|
||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/crypto" | ||
| "golang.org/x/crypto/sha3" | ||
| ) | ||
|
|
||
| // Signer allows you to sign a big stream of bytes by calling Sum multiple times, then Sign. | ||
| type Signer struct { | ||
| state crypto.KeccakState | ||
| privateKey *ecdsa.PrivateKey | ||
| } | ||
|
|
||
| // HexToECDSA parses a hex-encoded secp256k1 private key string to an ECDSA | ||
| // private key. | ||
| func HexToECDSA(hexKey string) (*ecdsa.PrivateKey, error) { | ||
| return crypto.HexToECDSA(hexKey) | ||
| } | ||
|
|
||
| // FileToECDSA parses a file path to a hex-encoded secp256k1 private key to an | ||
| // ECDSA private key. | ||
| func FileToECDSA(hexPath string) (*ecdsa.PrivateKey, error) { | ||
| return crypto.LoadECDSA(hexPath) | ||
| } | ||
|
|
||
| // NewSigner creates a new signer. | ||
| func NewSigner(pk *ecdsa.PrivateKey) *Signer { | ||
| return &Signer{ | ||
| state: sha3.NewLegacyKeccak256().(crypto.KeccakState), | ||
| privateKey: pk, | ||
| } | ||
| } | ||
|
|
||
| // Sum updates the hash state with a new chunk. | ||
| func (s *Signer) Sum(chunk []byte) { | ||
| s.state.Write(chunk) | ||
| } | ||
|
|
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| // Sign signs the internal state. | ||
| func (s *Signer) Sign() ([]byte, error) { | ||
| var h common.Hash | ||
| _, _ = s.state.Read(h[:]) | ||
| signature, err := crypto.Sign(h.Bytes(), s.privateKey) | ||
| if err != nil { | ||
| return []byte{}, fmt.Errorf("sign: %s", err) | ||
| } | ||
|
|
||
| return signature, nil | ||
| } | ||
|
|
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| // SignFile signs an entire file, returning the signature as a byte slice. | ||
| func (s *Signer) SignFile(filename string) ([]byte, error) { | ||
| f, err := os.Open(filename) | ||
| if err != nil { | ||
| return []byte{}, fmt.Errorf("error reading [file=%v]: %v", filename, err.Error()) | ||
| } | ||
| defer func() { | ||
| _ = f.Close() | ||
| }() | ||
|
|
||
| // Check if the file is empty and return an error if it is | ||
| info, err := f.Stat() | ||
| if err != nil { | ||
| return []byte{}, fmt.Errorf("failed to get file info: %s", err.Error()) | ||
| } | ||
| if info.Size() == 0 { | ||
| return []byte{}, fmt.Errorf("error with file: content is empty") | ||
| } | ||
|
|
||
| nBytes, nChunks := int64(0), int64(0) | ||
| r := bufio.NewReader(f) | ||
| buf := make([]byte, 0, 4*1024) // 4KB buffer | ||
| for { | ||
| n, err := r.Read(buf[:cap(buf)]) | ||
| buf = buf[:n] | ||
| if n == 0 { | ||
| if err == nil { | ||
| continue | ||
| } | ||
| if err == io.EOF { | ||
| break | ||
| } | ||
| return []byte{}, fmt.Errorf("unexpected error reading file: %s", err.Error()) | ||
| } | ||
| nChunks++ | ||
| nBytes += int64(len(buf)) | ||
|
|
||
| s.Sum(buf) | ||
|
|
||
| if err != nil && err != io.EOF { | ||
| return []byte{}, fmt.Errorf("error in buffer: %s", err.Error()) | ||
| } | ||
| } | ||
|
|
||
| signature, err := s.Sign() | ||
| if err != nil { | ||
| return []byte{}, fmt.Errorf("failed to sign [file=%v]: %s", filename, err.Error()) | ||
| } | ||
|
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| return signature, nil | ||
| } | ||
|
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| // SignBytes signs the provided bytes, returning the signature as a byte slice. | ||
| func (s *Signer) SignBytes(data []byte) ([]byte, error) { | ||
| if len(data) == 0 { | ||
| return []byte{}, fmt.Errorf("error with data: content is empty") | ||
| } | ||
|
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| s.Sum(data) | ||
|
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| signature, err := s.Sign() | ||
| if err != nil { | ||
| return []byte{}, fmt.Errorf("failed to sign data: %s", err.Error()) | ||
| } | ||
|
|
||
| return signature, nil | ||
| } |
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