HashAlgorithm.ComputeHash 메서드

정의

입력 데이터에 대해 해시 값을 계산합니다.Computes the hash value for the input data.

오버로드

ComputeHash(Byte[])

지정된 바이트 배열에 대해 해시 값을 계산합니다.Computes the hash value for the specified byte array.

ComputeHash(Stream)

지정된 Stream 개체에 대해 해시 값을 계산합니다.Computes the hash value for the specified Stream object.

ComputeHash(Byte[], Int32, Int32)

지정된 바이트 배열의 지정된 영역에 대해 해시 값을 계산합니다.Computes the hash value for the specified region of the specified byte array.

ComputeHash(Byte[])

지정된 바이트 배열에 대해 해시 값을 계산합니다.Computes the hash value for the specified byte array.

public:
 cli::array <System::Byte> ^ ComputeHash(cli::array <System::Byte> ^ buffer);
public byte[] ComputeHash (byte[] buffer);
member this.ComputeHash : byte[] -> byte[]
Public Function ComputeHash (buffer As Byte()) As Byte()

매개 변수

buffer
Byte[]

해시 코드를 컴퓨팅할 입력입니다.The input to compute the hash code for.

반환

Byte[]

계산된 해시 코드입니다.The computed hash code.

예외

buffernull인 경우buffer is null.

개체가 이미 삭제되었습니다.The object has already been disposed.

예제

다음 예제에서는 계산 된 SHA256 문자열의 해시 값 고 해시를 64 자 16 진수 형식 문자열로 반환 합니다.The following example computes the SHA256 hash value of a string and returns the hash as a 64-character, hexadecimal-formatted string. 이 코드 예제에서 만든 해시 문자열이 64 자, 16 진수 형식의 해시 문자열을 만드는 (모든 플랫폼)에서 SHA256 해시 함수 호환 됩니다.The hash string created by this code example is compatible with any SHA256 hash function (on any platform) that creates a 64-character, hexadecimal-formatted hash string.

using System;
using System.Security.Cryptography;
using System.Text;

public class Program
{
    public static void Main()
    {
        string source = "Hello World!";
        using (SHA256 sha256Hash = SHA256.Create())
        {
            string hash = GetHash(sha256Hash, source);

            Console.WriteLine($"The SHA256 hash of {source} is: {hash}.");

            Console.WriteLine("Verifying the hash...");

            if (VerifyHash(sha256Hash, source, hash))
            {
                Console.WriteLine("The hashes are the same.");
            }
            else
            {
                Console.WriteLine("The hashes are not same.");
            }
        }
    }

    private static string GetHash(HashAlgorithm hashAlgorithm, string input)
    {

        // Convert the input string to a byte array and compute the hash.
        byte[] data = hashAlgorithm.ComputeHash(Encoding.UTF8.GetBytes(input));

        // Create a new Stringbuilder to collect the bytes
        // and create a string.
        var sBuilder = new StringBuilder();

        // Loop through each byte of the hashed data 
        // and format each one as a hexadecimal string.
        for (int i = 0; i < data.Length; i++)
        {
            sBuilder.Append(data[i].ToString("x2"));
        }

        // Return the hexadecimal string.
        return sBuilder.ToString();
    }

    // Verify a hash against a string.
    private static bool VerifyHash(HashAlgorithm hashAlgorithm, string input, string hash)
    {
        // Hash the input.
        var hashOfInput = GetHash(hashAlgorithm, input);

        // Create a StringComparer an compare the hashes.
        StringComparer comparer = StringComparer.OrdinalIgnoreCase;

        return comparer.Compare(hashOfInput, hash) == 0;
    }

}
// The example displays the following output:
//    The SHA256 hash of Hello World! is: 7f83b1657ff1fc53b92dc18148a1d65dfc2d4b1fa3d677284addd200126d9069.
//    Verifying the hash...
//    The hashes are the same.
Imports System.Security.Cryptography
Imports System.Text

Public Module Program
    Public Sub Main()
        Dim source As String = "Hello World!"
        Using sha256Hash As SHA256 = SHA256.Create()

            Dim hash As String = GetHash(sha256Hash, source)

            Console.WriteLine($"The SHA256 hash of {source} is: {hash}.")

            Console.WriteLine("Verifying the hash...")

            If VerifyHash(sha256Hash, source, hash) Then
                Console.WriteLine("The hashes are the same.")
            Else
                Console.WriteLine("The hashes are not same.")
            End If
        End Using
    End Sub 

    Private Function GetHash(ByVal hashAlgorithm As HashAlgorithm, ByVal input As String) As String

        ' Convert the input string to a byte array and compute the hash.
        Dim data As Byte() = hashAlgorithm.ComputeHash(Encoding.UTF8.GetBytes(input))

        ' Create a new Stringbuilder to collect the bytes
        ' and create a string.
        Dim sBuilder As New StringBuilder()

        ' Loop through each byte of the hashed data 
        ' and format each one as a hexadecimal string.
        For i As Integer = 0 To data.Length - 1
            sBuilder.Append(data(i).ToString("x2"))
        Next

        ' Return the hexadecimal string.
        Return sBuilder.ToString()
    End Function

    ' Verify a hash against a string.
    Private Function VerifyHash(hashAlgorithm As HashAlgorithm, input As String, hash As String) As Boolean
        ' Hash the input.
        Dim hashOfInput As String = GetHash(hashAlgorithm, input)

        ' Create a StringComparer an compare the hashes.
        Dim comparer As StringComparer = StringComparer.OrdinalIgnoreCase

        Return comparer.Compare(hashOfInput, hash) = 0
    End Function
End Module
' The example displays the following output:
'    The SHA256 hash of Hello World! is: 7f83b1657ff1fc53b92dc18148a1d65dfc2d4b1fa3d677284addd200126d9069.
'    Verifying the hash...
'    The hashes are the same.

ComputeHash(Stream)

지정된 Stream 개체에 대해 해시 값을 계산합니다.Computes the hash value for the specified Stream object.

public:
 cli::array <System::Byte> ^ ComputeHash(System::IO::Stream ^ inputStream);
public byte[] ComputeHash (System.IO.Stream inputStream);
member this.ComputeHash : System.IO.Stream -> byte[]
Public Function ComputeHash (inputStream As Stream) As Byte()

매개 변수

inputStream
Stream

해시 코드를 컴퓨팅할 입력입니다.The input to compute the hash code for.

반환

Byte[]

계산된 해시 코드입니다.The computed hash code.

예외

개체가 이미 삭제되었습니다.The object has already been disposed.

예제

다음 예제에서는 계산 된 SHA256 디렉터리의 모든 파일에 대 한 해시입니다.The following example calculates the SHA256 hash for all files in a directory.

using System;
using System.IO;
using System.Security.Cryptography;

public class HashDirectory
{
    public static void Main(String[] args)
    {
        if (args.Length < 1)
        {
            Console.WriteLine("No directory selected.");
            return;
        }

        string directory = args[0];
        if (Directory.Exists(directory))
        {
            // Create a DirectoryInfo object representing the specified directory.
           var dir = new DirectoryInfo(directory);
            // Get the FileInfo objects for every file in the directory.
            FileInfo[] files = dir.GetFiles();
            // Initialize a SHA256 hash object.
            using (SHA256 mySHA256 = SHA256.Create())
            {
                // Compute and print the hash values for each file in directory.
                foreach (FileInfo fInfo in files)
                {
                    try { 
                        // Create a fileStream for the file.
                        FileStream fileStream = fInfo.Open(FileMode.Open);
                        // Be sure it's positioned to the beginning of the stream.
                        fileStream.Position = 0;
                        // Compute the hash of the fileStream.
                        byte[] hashValue = mySHA256.ComputeHash(fileStream);
                        // Write the name and hash value of the file to the console.
                        Console.Write($"{fInfo.Name}: ");
                        PrintByteArray(hashValue);
                        // Close the file.
                        fileStream.Close();
                    }
                    catch (IOException e) {
                        Console.WriteLine($"I/O Exception: {e.Message}");
                    }
                    catch (UnauthorizedAccessException e) {
                        Console.WriteLine($"Access Exception: {e.Message}");
                    }
                }
            }
        }
        else
        {
            Console.WriteLine("The directory specified could not be found.");
        }
    }

    // Display the byte array in a readable format.
    public static void PrintByteArray(byte[] array)
    {
        for (int i = 0; i < array.Length; i++)
        {
            Console.Write($"{array[i]:X2}");
            if ((i % 4) == 3) Console.Write(" ");
        }
        Console.WriteLine();
    }
}
Imports System.IO
Imports System.Security.Cryptography

Public Module HashDirectory

    Public Sub Main(ByVal args() As String)
        If args.Length < 1 Then
            Console.WriteLine("No directory selected")
            Return
        End If

        Dim targetDirectory As String = args(0)
        If Directory.Exists(targetDirectory) Then
            ' Create a DirectoryInfo object representing the specified directory.
            Dim dir As New DirectoryInfo(targetDirectory)
            ' Get the FileInfo objects for every file in the directory.
            Dim files As FileInfo() = dir.GetFiles()
            ' Initialize a SHA256 hash object.
            Using mySHA256 As SHA256 = SHA256.Create()
                ' Compute and print the hash values for each file in directory.
                For Each fInfo  As FileInfo In files
                    Try
                        ' Create a fileStream for the file.
                        Dim fileStream = fInfo.Open(FileMode.Open)
                        ' Be sure it's positioned to the beginning of the stream.
                        fileStream.Position = 0
                        ' Compute the hash of the fileStream.
                        Dim hashValue() As Byte = mySHA256.ComputeHash(fileStream)
                        ' Write the name of the file to the Console.
                        Console.Write(fInfo.Name + ": ")
                        ' Write the hash value to the Console.
                        PrintByteArray(hashValue)
                        ' Close the file.
                        fileStream.Close()
                    Catch e As IOException
                        Console.WriteLine($"I/O Exception: {e.Message}")
                    Catch e As UnauthorizedAccessException 
                        Console.WriteLine($"Access Exception: {e.Message}")
                    End Try    
                Next 
            End Using
        Else
           Console.WriteLine("The directory specified could not be found.")
        End If
    End Sub

    ' Print the byte array in a readable format.
    Public Sub PrintByteArray(array() As Byte)
        For i As Integer = 0 To array.Length - 1
            Console.Write($"{array(i):X2}")
            If i Mod 4 = 3 Then
                Console.Write(" ")
            End If
        Next 
        Console.WriteLine()

    End Sub 
End Module

ComputeHash(Byte[], Int32, Int32)

지정된 바이트 배열의 지정된 영역에 대해 해시 값을 계산합니다.Computes the hash value for the specified region of the specified byte array.

public:
 cli::array <System::Byte> ^ ComputeHash(cli::array <System::Byte> ^ buffer, int offset, int count);
public byte[] ComputeHash (byte[] buffer, int offset, int count);
member this.ComputeHash : byte[] * int * int -> byte[]
Public Function ComputeHash (buffer As Byte(), offset As Integer, count As Integer) As Byte()

매개 변수

buffer
Byte[]

해시 코드를 컴퓨팅할 입력입니다.The input to compute the hash code for.

offset
Int32

데이터 사용을 시작할 바이트 배열의 오프셋입니다.The offset into the byte array from which to begin using data.

count
Int32

데이터로 사용할 배열의 바이트 수입니다.The number of bytes in the array to use as data.

반환

Byte[]

계산된 해시 코드입니다.The computed hash code.

예외

count 값이 잘못된 경우count is an invalid value.

또는-or- buffer 길이가 잘못된 경우buffer length is invalid.

buffernull입니다.buffer is null.

offset이 범위에서 벗어난 경우.offset is out of range. 이 매개 변수에는 0 또는 양의 정수가 필요합니다.This parameter requires a non-negative number.

개체가 이미 삭제되었습니다.The object has already been disposed.

적용 대상