68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
package crypto
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"encoding/base64"
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"errors"
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"io"
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)
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// AES CBC模式加密，Base64传入传出
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func AesEncryptURL(plainText, key []byte) (string, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", err
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}
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blockSize := block.BlockSize()
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plainText = PKCS7Padding(plainText, blockSize)
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cipherText := make([]byte, blockSize+len(plainText))
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iv := cipherText[:blockSize] // 使用前blockSize字节作为IV
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_, err = io.ReadFull(rand.Reader, iv)
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if err != nil {
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return "", err
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}
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mode := cipher.NewCBCEncrypter(block, iv)
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mode.CryptBlocks(cipherText[blockSize:], plainText)
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return base64.URLEncoding.EncodeToString(cipherText), nil
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}
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// AES CBC模式解密，Base64传入传出
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func AesDecryptURL(cipherTextBase64 string, key []byte) ([]byte, error) {
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cipherText, err := base64.URLEncoding.DecodeString(cipherTextBase64)
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if err != nil {
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return nil, err
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}
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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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if len(cipherText) < blockSize {
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return nil, errors.New("ciphertext too short")
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}
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iv := cipherText[:blockSize]
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cipherText = cipherText[blockSize:]
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if len(cipherText)%blockSize != 0 {
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return nil, errors.New("ciphertext is not a multiple of the block size")
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}
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mode := cipher.NewCBCDecrypter(block, iv)
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mode.CryptBlocks(cipherText, cipherText)
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plainText, err := PKCS7UnPadding(cipherText)
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if err != nil {
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return nil, err
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}
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return plainText, nil
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}
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