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bloc_cryptor.go
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/
bloc_cryptor.go
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package padding
import (
"crypto/cipher"
"io"
)
// P7BlockDecrypt 解密密文,并去除PKCS#7填充
// decrypter: 块解密器
// in: 密文输入流
// out: 明文输出流
func P7BlockDecrypt(decrypter cipher.BlockMode, in io.Reader, out io.Writer) error {
bufIn := make([]byte, 1024)
bufOut := make([]byte, 1024)
p7Out := NewPKCS7PaddingWriter(out, decrypter.BlockSize())
for {
n, err := in.Read(bufIn)
if err != nil && err != io.EOF {
return err
}
if n == 0 {
break
}
decrypter.CryptBlocks(bufOut, bufIn[:n])
_, err = p7Out.Write(bufOut[:n])
if err != nil {
return err
}
}
return p7Out.Final()
}
// P7BlockEnc 以PKCS#7填充模式填充原文,并加密输出
// encrypter: 块加密器
// in: 明文输入流
// out: 密文输出流
func P7BlockEnc(encrypter cipher.BlockMode, in io.Reader, out io.Writer) error {
bufIn := make([]byte, 1024)
bufOut := make([]byte, 1024)
p7In := NewPKCS7PaddingReader(in, encrypter.BlockSize())
for {
n, err := p7In.Read(bufIn)
if err != nil && err != io.EOF {
return err
}
if n == 0 {
break
}
encrypter.CryptBlocks(bufOut, bufIn[:n])
_, err = out.Write(bufOut[:n])
if err != nil {
return err
}
}
return nil
}