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這期內(nèi)容當(dāng)中小編將會(huì)給大家?guī)?lái)有關(guān)c# 如何實(shí)現(xiàn)加密解密AES字節(jié)數(shù)組,文章內(nèi)容豐富且以專業(yè)的角度為大家分析和敘述,閱讀完這篇文章希望大家可以有所收獲。
AES類時(shí)微軟MSDN中最常用的加密類
1、輸入一個(gè)字節(jié)數(shù)組,經(jīng)AES加密后,直接輸出加密后的字節(jié)數(shù)組。
2、輸入一個(gè)加密后的字節(jié)數(shù)組,經(jīng)AES解密后,直接輸出原字節(jié)數(shù)組。
對(duì)于我這個(gè)十八流業(yè)余愛(ài)好者來(lái)說(shuō),AES我是以用為主的,所以具體的AES是怎么運(yùn)算的,我其實(shí)并不關(guān)心,我更關(guān)心的是AES的處理流程。結(jié)果恰恰這一方面,網(wǎng)上的信息差強(qiáng)人意,看了網(wǎng)上不少的帖子,但感覺(jué)都沒(méi)有說(shuō)完整說(shuō)透,而且很多帖子有錯(cuò)誤。
因此,我自己繪制了一張此種方式下的流程圖:
按照此流程圖進(jìn)行了核心代碼的編寫(xiě),驗(yàn)證方法AesCoreSingleTest既是依照此流程的產(chǎn)物,實(shí)例化類AesCoreSingle后調(diào)用此方法即可驗(yàn)證。
至于類中的異步方法EnOrDecryptFileAsync,則是專門(mén)用于文件加解密的處理,此異步方法參考自《C# 6.0學(xué)習(xí)筆記》(周家安 著)最后的示例,這本書(shū)寫(xiě)得真棒。
using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Security.Cryptography; using System.Text; using System.Threading; using System.Threading.Tasks; using System.Windows; namespace AesSingleFile { class AesCoreSingle { /// <summary> /// 使用用戶口令,生成符合AES標(biāo)準(zhǔn)的key和iv。 /// </summary> /// <param name="password">用戶輸入的口令</param> /// <returns>返回包含密鑰和向量的元組</returns> private (byte[] Key, byte[] IV) GenerateKeyAndIV(string password) { byte[] key = new byte[32]; byte[] iv = new byte[16]; byte[] hash = default; if (string.IsNullOrWhiteSpace(password)) throw new ArgumentException("必須輸入口令!"); using (SHA384 sha = SHA384.Create()) { byte[] buffer = Encoding.UTF8.GetBytes(password); hash = sha.ComputeHash(buffer); } //用SHA384的原因:生成的384位哈希值正好被分成兩段使用。(32+16)*8=384。 Array.Copy(hash, 0, key, 0, 32);//生成256位密鑰(32*8=256) Array.Copy(hash, 32, iv, 0, 16);//生成128位向量(16*8=128) return (Key: key, IV: iv); } public byte[] EncryptByte(byte[] buffer, string password) { byte[] encrypted; using (Aes aes = Aes.Create()) { //設(shè)定密鑰和向量 (aes.Key, aes.IV) = GenerateKeyAndIV(password); //設(shè)定運(yùn)算模式和填充模式 aes.Mode = CipherMode.CBC;//默認(rèn) aes.Padding = PaddingMode.PKCS7;//默認(rèn) //創(chuàng)建加密器對(duì)象(加解密方法不同處僅僅這一句話) var encryptor = aes.CreateEncryptor(aes.Key, aes.IV); using (MemoryStream msEncrypt = new MemoryStream()) { using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))//選擇Write模式 { csEncrypt.Write(buffer, 0, buffer.Length);//對(duì)原數(shù)組加密并寫(xiě)入流中 csEncrypt.FlushFinalBlock();//使用Write模式需要此句,但Read模式必須要有。 encrypted = msEncrypt.ToArray();//從流中寫(xiě)入數(shù)組(加密之后,數(shù)組變長(zhǎng),詳見(jiàn)方法AesCoreSingleTest內(nèi)容) } } } return encrypted; } public byte[] DecryptByte(byte[] buffer, string password) { byte[] decrypted; using (Aes aes = Aes.Create()) { //設(shè)定密鑰和向量 (aes.Key, aes.IV) = GenerateKeyAndIV(password); //設(shè)定運(yùn)算模式和填充模式 aes.Mode = CipherMode.CBC;//默認(rèn) aes.Padding = PaddingMode.PKCS7;//默認(rèn) //創(chuàng)建解密器對(duì)象(加解密方法不同處僅僅這一句話) var decryptor = aes.CreateDecryptor(aes.Key, aes.IV); using (MemoryStream msDecrypt = new MemoryStream(buffer)) { using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))//選擇Read模式 { byte[] buffer_T = new byte[buffer.Length];/*--s1:創(chuàng)建臨時(shí)數(shù)組,用于包含可用字節(jié)+無(wú)用字節(jié)--*/ int i = csDecrypt.Read(buffer_T, 0, buffer.Length);/*--s2:對(duì)加密數(shù)組進(jìn)行解密,并通過(guò)i確定實(shí)際多少字節(jié)可用--*/ //csDecrypt.FlushFinalBlock();//使用Read模式不能有此句,但write模式必須要有。 decrypted = new byte[i];/*--s3:創(chuàng)建只容納可用字節(jié)的數(shù)組--*/ Array.Copy(buffer_T, 0, decrypted, 0, i);/*--s4:從bufferT拷貝出可用字節(jié)到decrypted--*/ } } return decrypted; } } public byte[] EnOrDecryptByte(byte[] buffer, string password, ActionDirection direction) { if (buffer == null) throw new ArgumentNullException("buffer為空"); if (password == null || password == "") throw new ArgumentNullException("password為空"); if (direction == ActionDirection.EnCrypt) return EncryptByte(buffer, password); else return DecryptByte(buffer, password); } public enum ActionDirection//該枚舉說(shuō)明是加密還是解密 { EnCrypt,//加密 DeCrypt//解密 } public static void AesCoreSingleTest(string s_in, string password)//驗(yàn)證加密解密模塊正確性方法 { byte[] buffer = Encoding.UTF8.GetBytes(s_in); AesCoreSingle aesCore = new AesCoreSingle(); byte[] buffer_ed = aesCore.EncryptByte(buffer, password); byte[] buffer_ed2 = aesCore.DecryptByte(buffer_ed, password); string s = Encoding.UTF8.GetString(buffer_ed2); string s2 = "下列字符串\n" + s + '\n' + $"原buffer長(zhǎng)度 → {buffer.Length}, 加密后buffer_ed長(zhǎng)度 → {buffer_ed.Length}, 解密后buffer_ed2長(zhǎng)度 → {buffer_ed2.Length}"; MessageBox.Show(s2); /* 字符串在加密前后的變化(默認(rèn)CipherMode.CBC運(yùn)算模式, PaddingMode.PKCS7填充模式) * 1、如果數(shù)組長(zhǎng)度為16的倍數(shù),則加密后的數(shù)組長(zhǎng)度=原長(zhǎng)度+16 如對(duì)于下列字符串 D:\User\Documents\Administrator - DOpus Config - 2020-06-301.ocb 使用UTF8編碼轉(zhuǎn)化為字節(jié)數(shù)組后, 原buffer → 64, 加密后buffer_ed → 80, 解密后buffer_ed2 → 64 * 2、如果數(shù)組長(zhǎng)度不為16的倍數(shù),則加密后的數(shù)組長(zhǎng)度=16倍數(shù)向上取整 如對(duì)于下列字符串 D:\User\Documents\cc_20200630_113921.reg 使用UTF8編碼轉(zhuǎn)化為字節(jié)數(shù)組后 原buffer → 40, 加密后buffer_ed → 48, 解密后buffer_ed2 → 40 參考文獻(xiàn): 1-《AES補(bǔ)位填充PaddingMode.Zeros模式》http://blog.chinaunix.net/uid-29641438-id-5786927.html 2-《關(guān)于PKCS5Padding與PKCS7Padding的區(qū)別》https://www.cnblogs.com/midea0978/articles/1437257.html 3-《AES-128 ECB 加密有感》http://blog.sina.com.cn/s/blog_60cf051301015orf.html */ } /***---聲明CancellationTokenSource對(duì)象--***/ private CancellationTokenSource cts;//using System.Threading;引用 public Task EnOrDecryptFileAsync(Stream inStream, long inStream_Seek, Stream outStream, long outStream_Seek, string password, ActionDirection direction, IProgress<int> progress) { /***---實(shí)例化CancellationTokenSource對(duì)象--***/ cts?.Dispose();//cts為空,不動(dòng)作,cts不為空,執(zhí)行Dispose。 cts = new CancellationTokenSource(); Task mytask = new Task( () => { EnOrDecryptFile(inStream, inStream_Seek, outStream, outStream_Seek, password, direction, progress); }, cts.Token, TaskCreationOptions.LongRunning); mytask.Start(); return mytask; } public void EnOrDecryptFile(Stream inStream, long inStream_Seek, Stream outStream, long outStream_Seek, string password, ActionDirection direction, IProgress<int> progress) { if (inStream == null || outStream == null) throw new ArgumentException("輸入流與輸出流是必須的"); //--調(diào)整流的位置(通常是為了避開(kāi)文件頭部分) inStream.Seek(inStream_Seek, SeekOrigin.Begin); outStream.Seek(outStream_Seek, SeekOrigin.Begin); //用于記錄處理進(jìn)度 long total_Length = inStream.Length - inStream_Seek; long totalread_Length = 0; //初始化報(bào)告進(jìn)度 progress.Report(0); using (Aes aes = Aes.Create()) { //設(shè)定密鑰和向量 (aes.Key, aes.IV) = GenerateKeyAndIV(password); //創(chuàng)建加密器解密器對(duì)象(加解密方法不同處僅僅這一句話) ICryptoTransform cryptor; if (direction == ActionDirection.EnCrypt) cryptor = aes.CreateEncryptor(aes.Key, aes.IV); else cryptor = aes.CreateDecryptor(aes.Key, aes.IV); using (CryptoStream cstream = new CryptoStream(outStream, cryptor, CryptoStreamMode.Write)) { byte[] buffer = new byte[512 * 1024];//每次讀取512kb的數(shù)據(jù) int readLen = 0; while ((readLen = inStream.Read(buffer, 0, buffer.Length)) != 0) { // 向加密流寫(xiě)入數(shù)據(jù) cstream.Write(buffer, 0, readLen); totalread_Length += readLen; //匯報(bào)處理進(jìn)度 if (progress != null) { long per = 100 * totalread_Length / total_Length; progress.Report(Convert.ToInt32(per)); } } } } } } }
上述就是小編為大家分享的c# 如何實(shí)現(xiàn)加密解密AES字節(jié)數(shù)組了,如果剛好有類似的疑惑,不妨參照上述分析進(jìn)行理解。如果想知道更多相關(guān)知識(shí),歡迎關(guān)注億速云行業(yè)資訊頻道。
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