復号化(ハッシュ値、MD 5値の検証)
2840 ワード
1、テキストハッシュ値を計算する:
2、計算ファイルのハッシュ値、MD 5:
3、復号文字列
MD 5の暗号文を取得するには、次の手順に従います.
public static string ComputeHash(string password)
{
byte[] buffer = System.Text.Encoding.UTF8.GetBytes(password);
SHA1CryptoServiceProvider sha = new SHA1CryptoServiceProvider();
byte[] hash = sha.ComputeHash(buffer);
StringBuilder passwordbullder = new StringBuilder(32);
foreach (byte hashByte in hash)
{
passwordbullder.Append(hashByte.ToString("x2"));
}
return passwordbullder.ToString();
}
2、計算ファイルのハッシュ値、MD 5:
FileStream fs = new FileStream(this.fileFullName, FileMode.Open, FileAccess.Read);
SHA1CryptoServiceProvider sha1 = new SHA1CryptoServiceProvider();
Byte[] fileHashes_SHA1 = sha1.ComputeHash(fs);
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
Byte[] fileHashes_MD5 = md5.ComputeHash(fs);
//this.fileSize = fs.Length;
//this.sendSize = 0;
fs.Close();
fs.Dispose();
3、復号文字列
/// <summary>
/// 。
/// </summary>
/// <param name="sourceString"> 。</param>
/// <param name="encryptionKey"> 。</param>
/// <returns> 。</returns>
private String DecryptString(String sourceString, String encryptionKey)
{
try
{
Byte[] rgbKey = Encoding.UTF8.GetBytes(encryptionKey.Substring(0, 8));
Byte[] rgbIV = this.iv; // { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
Byte[] inputByteArray = Convert.FromBase64String(sourceString);
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
return Encoding.UTF8.GetString(ms.ToArray());
}
catch
{
return String.Empty;
}
}
MD 5の暗号文を取得するには、次の手順に従います.
public static string GetMd5Hash(string input)
{
MD5 md5Hasher = MD5.Create();
byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(input));
StringBuilder sBuilder = new StringBuilder();
for (int i = 0; i < data.Length; i++)
{
sBuilder.Append(data[i].ToString("x2"));
}
return sBuilder.ToString();
}