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rsa.go
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rsa.go
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package encoding
import (
"crypto"
"crypto/rand"
"crypto/rsa"
)
func packageData(originalData []byte, packageSize int) (r [][]byte) {
var src = make([]byte, len(originalData))
copy(src, originalData)
r = make([][]byte, 0)
if len(src) <= packageSize {
return append(r, src)
}
for len(src) > 0 {
var p = src[:packageSize]
r = append(r, p)
src = src[packageSize:]
if len(src) <= packageSize {
r = append(r, src)
break
}
}
return r
}
func RSAEncryptPKCS1(plaintext, key []byte) ([]byte, error) {
pub, err := ParsePKCS1PublicKey(key)
if err != nil {
return nil, err
}
var data = packageData(plaintext, pub.N.BitLen()/8-11)
var cipherData = make([]byte, 0, 0)
for _, d := range data {
var c, e = rsa.EncryptPKCS1v15(rand.Reader, pub, d)
if e != nil {
return nil, e
}
cipherData = append(cipherData, c...)
}
return cipherData, nil
}
func RSAEncryptPKCS1WithKey(plaintext []byte, key *rsa.PublicKey) ([]byte, error) {
var data = packageData(plaintext, key.N.BitLen()/8-11)
var cipherData = make([]byte, 0, 0)
for _, d := range data {
var c, e = rsa.EncryptPKCS1v15(rand.Reader, key, d)
if e != nil {
return nil, e
}
cipherData = append(cipherData, c...)
}
return cipherData, nil
}
func RSADecryptPKCS1(ciphertext, key []byte) ([]byte, error) {
pri, err := ParsePKCS1PrivateKey(key)
if err != nil {
return nil, err
}
var data = packageData(ciphertext, pri.PublicKey.N.BitLen()/8)
var plainData = make([]byte, 0, 0)
for _, d := range data {
var p, e = rsa.DecryptPKCS1v15(rand.Reader, pri, d)
if e != nil {
return nil, e
}
plainData = append(plainData, p...)
}
return plainData, nil
}
func RSADecryptPKCS1WithKey(ciphertext []byte, key *rsa.PrivateKey) ([]byte, error) {
var data = packageData(ciphertext, key.PublicKey.N.BitLen()/8)
var plainData = make([]byte, 0, 0)
for _, d := range data {
var p, e = rsa.DecryptPKCS1v15(rand.Reader, key, d)
if e != nil {
return nil, e
}
plainData = append(plainData, p...)
}
return plainData, nil
}
func SignPKCS1v15(src, key []byte, hash crypto.Hash) ([]byte, error) {
pri, err := ParsePKCS1PrivateKey(key)
if err != nil {
return nil, err
}
return SignPKCS1v15WithKey(src, pri, hash)
}
func SignPKCS1v15WithKey(src []byte, key *rsa.PrivateKey, hash crypto.Hash) ([]byte, error) {
var h = hash.New()
h.Write(src)
var hashed = h.Sum(nil)
return rsa.SignPKCS1v15(rand.Reader, key, hash, hashed)
}
func VerifyPKCS1v15(src, sig, key []byte, hash crypto.Hash) error {
pub, err := ParsePKCS1PublicKey(key)
if err != nil {
return err
}
return VerifyPKCS1v15WithKey(src, sig, pub, hash)
}
func VerifyPKCS1v15WithKey(src, sig []byte, key *rsa.PublicKey, hash crypto.Hash) error {
var h = hash.New()
h.Write(src)
var hashed = h.Sum(nil)
return rsa.VerifyPKCS1v15(key, hash, hashed, sig)
}