sugarBecomer
79 lines
1.6 KiB
Go
79 lines
1.6 KiB
Go
package cryptoutil
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import (
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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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const (
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scAESKey = "m1xp9slgfa|su@m2"
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scAESIV = "pa!st17m@04h5u#0"
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)
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// EncryptSC AES-CBC加密，使用固定的key和iv
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func EncryptSC(plaintext string) string {
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key := []byte(scAESKey)
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iv := []byte(scAESIV)
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block, err := aes.NewCipher(key)
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if err != nil {
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return ""
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}
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// PKCS7填充
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blockSize := block.BlockSize()
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padding := blockSize - len(plaintext)%blockSize
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padText := make([]byte, padding)
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for i := range padText {
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padText[i] = byte(padding)
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}
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plaintextBytes := append([]byte(plaintext), padText...)
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// CBC加密
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ciphertext := make([]byte, len(plaintextBytes))
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mode := cipher.NewCBCEncrypter(block, iv)
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mode.CryptBlocks(ciphertext, plaintextBytes)
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// Base64编码
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return base64.StdEncoding.EncodeToString(ciphertext)
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}
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// DecryptSC AES-CBC解密，使用固定的key和iv
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func DecryptSC(ciphertext string) string {
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key := []byte(scAESKey)
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iv := []byte(scAESIV)
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// Base64解码
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ciphertextBytes, err := base64.StdEncoding.DecodeString(ciphertext)
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if err != nil {
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return ""
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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 ""
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}
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// CBC解密
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blockSize := block.BlockSize()
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if len(ciphertextBytes)%blockSize != 0 {
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return ""
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}
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plaintext := make([]byte, len(ciphertextBytes))
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mode := cipher.NewCBCDecrypter(block, iv)
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mode.CryptBlocks(plaintext, ciphertextBytes)
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// 去除PKCS7填充
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if len(plaintext) == 0 {
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return ""
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}
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padding := int(plaintext[len(plaintext)-1])
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if padding <= 0 || padding > blockSize || padding > len(plaintext) {
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return ""
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}
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return string(plaintext[:len(plaintext)-padding])
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}
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