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48 lines
1.2 KiB
Go
48 lines
1.2 KiB
Go
package crypto
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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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)
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func paddingPKCS7(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 unpaddingPKCS7(origData []byte) []byte {
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length := len(origData)
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unpadding := int(origData[length-1])
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return origData[:(length - unpadding)]
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}
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//EncryptAES 加密函式
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func EncryptAES(plaintext, key, iv []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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blockSize := block.BlockSize()
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plaintext = paddingPKCS7(plaintext, blockSize)
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blockMode := cipher.NewCBCEncrypter(block, iv)
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crypted := make([]byte, len(plaintext))
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blockMode.CryptBlocks(crypted, plaintext)
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return crypted, nil
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}
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// DecryptAES 解密函式
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func DecryptAES(ciphertext, key, iv []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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blockSize := block.BlockSize()
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blockMode := cipher.NewCBCDecrypter(block, iv[:blockSize])
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origData := make([]byte, len(ciphertext))
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blockMode.CryptBlocks(origData, ciphertext)
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origData = unpaddingPKCS7(origData)
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return origData, nil
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}
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