Different SHA1 Hash result between Java and C#

Question

I\'ve a big problem. I using this C# function to encode my message:

byte[] buffer = Encoding.ASCII.GetBytes(file_or_text);
SHA1CryptoServiceProvider cryptoTr         


        

Answer 1

Try the following code:

public static string Sha1encode(string toEncrypt) {
    // Produce an array of bytes which is the SHA1 hash
    byte[] sha1Signature = new byte[40];

    byte[] sha = System.Text.Encoding.Default.GetBytes(toEncrypt);
    SHA1 sha1 = SHA1Managed.Create();
    sha1Signature = sha1.ComputeHash(sha);

    // The BASE64 encoding standard's 6-bit alphabet, from RFC 1521,
    // plus the padding character at the end.

    char[] Base64Chars = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',
            'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U',
            'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
            'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
            't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4',
            '5', '6', '7', '8', '9', '+', '/', '=' };
    // Algorithm to encode the SHA1 hash using Base64
    StringBuilder sb = new StringBuilder();
    int len = sha1Signature.Length;
    int i = 0;
    int ival;
    while (len >= 3) {
        ival = ((int) sha1Signature[i++] + 256) & 0xff;
        ival <<= 8;
        ival += ((int) sha1Signature[i++] + 256) & 0xff;
        ival <<= 8;
        ival += ((int) sha1Signature[i++] + 256) & 0xff;
        len -= 3;
        sb.Append(Base64Chars[(ival >> 18) & 63]);
        sb.Append(Base64Chars[(ival >> 12) & 63]);
        sb.Append(Base64Chars[(ival >> 6) & 63]);
        sb.Append(Base64Chars[ival & 63]);
    }
    switch (len) {
    case 0: // No pads needed.
        break;
    case 1: // Two more output bytes and two pads.
        ival = ((int) sha1Signature[i++] + 256) & 0xff;
        ival <<= 16;
        sb.Append(Base64Chars[(ival >> 18) & 63]);
        sb.Append(Base64Chars[(ival >> 12) & 63]);
        sb.Append(Base64Chars[64]);
        sb.Append(Base64Chars[64]);
        break;
    case 2: // Three more output bytes and one pad.
        ival = ((int) sha1Signature[i++] + 256) & 0xff;
        ival <<= 8;
        ival += ((int) sha1Signature[i] + 256) & 0xff;
        ival <<= 8;
        sb.Append(Base64Chars[(ival >> 18) & 63]);
        sb.Append(Base64Chars[(ival >> 12) & 63]);
        sb.Append(Base64Chars[(ival >> 6) & 63]);
        sb.Append(Base64Chars[64]);
        break;
    }

    string base64Sha1Signature = sb.ToString();
    return base64Sha1Signature;
}