DES加密ECB(模式) golang
package mainimport (
log
"ad-service/alog" "bytes"
"crypto/des"
"encoding/base64"
)
func EntryptDesECB(data, key []byte) string {
if len(key) > 8 {
key = key[:8]
}
block, err := des.NewCipher(key)
if err != nil {
log.Errorf("EntryptDesECB newCipher error[%v]", err)
return ""
}
bs := block.BlockSize()
data = PKCS5Padding(data, bs)
if len(data)%bs != 0 {
log.Error("EntryptDesECB Need a multiple of the blocksize")
return ""
}
out := make([]byte, len(data))
dst := out
for len(data) > 0 {
block.Encrypt(dst, data[:bs])
data = data
dst = dst
}
return base64.StdEncoding.EncodeToString(out)
}
func DecryptDESECB(d, key []byte) string {
data, err := base64.StdEncoding.DecodeString(d)
if err != nil {
log.Errorf("DecryptDES Decode base64 error[%v]", err)
return ""
}
if len(key) > 8 {
key = key[:8]
}
block, err := des.NewCipher(key)
if err != nil {
log.Errorf("DecryptDES NewCipher error[%v]", err)
return ""
}
bs := block.BlockSize()
if len(data)%bs != 0 {
log.Error("DecryptDES crypto/cipher: input not full blocks")
return ""
}
out := make([]byte, len(data))
dst := out
for len(data) > 0 {
block.Decrypt(dst, data[:bs])
data = data
dst = dst
}
out = PKCS5UnPadding(out)
return string(out)
}
func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
padding := blockSize - len(ciphertext)%blockSize
padtext := bytes.Repeat([]byte{byte(padding)}, padding)
return append(ciphertext, padtext...)
}
func PKCS5UnPadding(origData []byte) []byte {
length := len(origData)
unpadding := int(origData)
return origData[:(length - unpadding)]
}
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