105 lines
2.8 KiB
Go
105 lines
2.8 KiB
Go
package aes
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import (
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"bytes"
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"crypto/aes"
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"crypto/cipher"
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"encoding/base64"
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)
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// AES加密
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func Encrypt(key string, iv string, data string) string {
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if len(data) == 0 {
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return ""
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}
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key2, _ := base64.StdEncoding.DecodeString(key)
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iv2, _ := base64.StdEncoding.DecodeString(iv)
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block, _ := aes.NewCipher(key2)
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bs := block.BlockSize()
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originData := _PKCS5Padding([]byte(data), bs)
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cipher.NewCBCEncrypter(block, iv2).CryptBlocks(originData, originData)
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data = base64.StdEncoding.EncodeToString(originData)
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return data
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}
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// AES解密
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func Decrypt(key string, iv string, data string) string {
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if len(data) == 0 {
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return ""
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}
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key2, _ := base64.StdEncoding.DecodeString(key)
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iv2, _ := base64.StdEncoding.DecodeString(iv)
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block, _ := aes.NewCipher(key2)
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originData, err := base64.StdEncoding.DecodeString(data)
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if err != nil {
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return ""
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}
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cipher.NewCBCDecrypter(block, iv2).CryptBlocks(originData, originData)
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data = string(_PKCS5UnPadding(originData))
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return data
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}
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func _PKCS5Padding(cipherText []byte, blockSize int) []byte {
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padding := blockSize - len(cipherText)%blockSize
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padText := bytes.Repeat([]byte{byte(padding)}, padding)
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return append(cipherText, padText...)
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}
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func _PKCS5UnPadding(origData []byte) []byte {
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length := len(origData)
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unpadding := int(origData[length-1])
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if length-unpadding < 0 {
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return origData
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}
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return origData[:(length - unpadding)]
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}
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// =================== ECB ======================
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func AesEncryptECB(origData []byte, key []byte) (data string) {
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cipher, _ := aes.NewCipher(generateKey(key))
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length := (len(origData) + aes.BlockSize) / aes.BlockSize
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plain := make([]byte, length*aes.BlockSize)
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copy(plain, origData)
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pad := byte(len(plain) - len(origData))
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for i := len(origData); i < len(plain); i++ {
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plain[i] = pad
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}
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encrypted := make([]byte, len(plain))
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// 分组分块加密
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for bs, be := 0, cipher.BlockSize(); bs <= len(origData); bs, be = bs+cipher.BlockSize(), be+cipher.BlockSize() {
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cipher.Encrypt(encrypted[bs:be], plain[bs:be])
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}
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data = base64.StdEncoding.EncodeToString(encrypted)
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return data
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}
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func AesDecryptECB(encrypted string, key []byte) (decrypted []byte) {
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decodedCiphertext, _ := base64.StdEncoding.DecodeString(encrypted)
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cipher, _ := aes.NewCipher(generateKey(key))
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decrypted = make([]byte, len(decodedCiphertext))
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//
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for bs, be := 0, cipher.BlockSize(); bs < len(decodedCiphertext); bs, be = bs+cipher.BlockSize(), be+cipher.BlockSize() {
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cipher.Decrypt(decrypted[bs:be], decodedCiphertext[bs:be])
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}
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trim := 0
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if len(decrypted) > 0 {
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trim = len(decrypted) - int(decrypted[len(decrypted)-1])
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}
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return decrypted[:trim]
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}
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func generateKey(key []byte) (genKey []byte) {
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genKey = make([]byte, 16)
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copy(genKey, key)
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for i := 16; i < len(key); {
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for j := 0; j < 16 && i < len(key); j, i = j+1, i+1 {
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genKey[j] ^= key[i]
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}
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}
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return genKey
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}
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