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// rsa_help
package utils
import (
"crypto"
"crypto/md5"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"log"
)
func RsaEncryptWithPublickKey(originalData, publickey []byte) (result []byte, err error) {
decoded, err := base64.StdEncoding.DecodeString(string(publickey))
if err != nil {
log.Println(err)
return nil, err
}
var pubInterface interface{}
if pubInterface, err = x509.ParsePKIXPublicKey(decoded); err == nil {
pub := pubInterface.(*rsa.PublicKey)
max := (pub.N.BitLen()+7)/8 - 11
for len(originalData) > 0 {
var temp []byte
if len(originalData) > max {
temp = originalData[:max]
originalData = originalData[max:]
} else {
temp = originalData[:]
originalData = originalData[:0]
}
if out, err := rsa.EncryptPKCS1v15(rand.Reader, pub, temp); err == nil {
result = append(result, out...)
} else {
return nil, err
}
}
return result, nil
}
return
}
func RsaDecryptWithPrivateKey(ciphertext, privateKey []byte) (result []byte, err error) {
decoded, err := base64.StdEncoding.DecodeString(string(privateKey))
if err != nil {
log.Println(err)
return nil, err
}
var priInterface interface{}
if priInterface, err = x509.ParsePKCS8PrivateKey(decoded); err == nil {
priv := priInterface.(*rsa.PrivateKey)
max := (priv.N.BitLen() + 7) / 8
for len(ciphertext) > 0 {
var temp []byte
if len(ciphertext) > max {
temp = ciphertext[:max]
ciphertext = ciphertext[max:]
} else {
temp = ciphertext[:]
ciphertext = ciphertext[:0]
}
if out, err := priv.Decrypt(rand.Reader, temp, new(rsa.PKCS1v15DecryptOptions)); err == nil {
result = append(result, out...)
} else {
return nil, err
}
}
}
return
}
func RsaSignWithPrivateKey(origData, private []byte) ([]byte, error) {
decoded, err := base64.StdEncoding.DecodeString(string(private))
if err != nil {
log.Println(err)
return nil, err
}
privinterface, err := x509.ParsePKCS8PrivateKey(decoded)
if err != nil {
log.Println(err)
return nil, err
}
resbyte := md5.Sum(origData)
priv := privinterface.(*rsa.PrivateKey)
return rsa.SignPKCS1v15(nil, priv, crypto.MD5, resbyte[:])
}
func RsaSignWithPrivateKeyUseBase64(origData, private []byte) ([]byte, error) {
decoded, err := base64.StdEncoding.DecodeString(string(private))
if err != nil {
log.Println(err)
return nil, err
}
privinterface, err := x509.ParsePKCS8PrivateKey(decoded)
if err != nil {
log.Println(err)
return nil, err
}
resbyte := md5.Sum(origData)
priv := privinterface.(*rsa.PrivateKey)
res, err := rsa.SignPKCS1v15(nil, priv, crypto.MD5, resbyte[:])
coder := base64.NewEncoding(base64Table)
return []byte(coder.EncodeToString(res)), err
}
/*func RsaEncryptWithPrivateKey(originalData, privatekey []byte) ([]byte, error) {
decoded, err := base64.StdEncoding.DecodeString(string(publicKey))
if err != nil {
log.Println(err)
return nil, err
}
privInterface, err := x509.ParsePKCS1PrivateKey(decoded)
if err != nil {
log.Println(err)
return nil, err
}
priv := privInterface.(*rsa.PrivateKey)
return rsa.EncryptPKCS1v15(rand.Reader, pub, origData)
}*/
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