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cypher.go
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cypher.go
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package cypher
import (
"crypto/ecdsa"
"crypto/rand"
"crypto/sha256"
"math/big"
)
type Cryptor struct {
Data []byte
R *big.Int
S *big.Int
}
func NewCryptor(k *PrivateKey, data []byte) (*Cryptor, error) {
c := &Cryptor{
Data: data,
}
if h, err := c.hash(); err != nil {
return nil, err
} else if r, s, err := ecdsa.Sign(rand.Reader, k.toEcdsa(), h); err != nil {
return nil, err
} else {
c.R = r
c.S = s
}
return c, nil
}
func (c *Cryptor) hash() ([]byte, error) {
h256 := sha256.New()
if _, err := h256.Write(c.Data); err != nil {
return nil, err
}
return h256.Sum(nil), nil
}
func (c *Cryptor) Verify(k *PublicKey) (bool, error) {
h, err := c.hash()
if err != nil {
return false, err
}
return ecdsa.Verify(k.toEcdsa(), h, c.R, c.S), nil
}
func (c *Cryptor) ToBytes() ([]byte, error) {
return toBytes(c)
}
func (c *Cryptor) ToB64String() (string, error) {
return toB64String(c)
}
func (c *Cryptor) ToB32String() (string, error) {
return toB32String(c)
}
func (c *Cryptor) ToHexString() (string, error) {
return toHexString(c)
}
func PayloadFromBytes(b []byte) (*Cryptor, error) {
l := &Cryptor{}
return l, fromBytes(l, b)
}
func PayloadFromB64String(str string) (*Cryptor, error) {
l := &Cryptor{}
return l, fromB64String(l, str)
}
func PayloadFromB32String(str string) (*Cryptor, error) {
l := &Cryptor{}
return l, fromB32String(l, str)
}
func PayloadFromHexString(str string) (*Cryptor, error) {
l := &Cryptor{}
return l, fromHexString(l, str)
}