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SHA-512を使用して整数配列をハッシュするプログラムを実装しようとしました。私はsolution1solution2を見出し、十進数を含むbyte[]を16進数に変換しました。文字列の出力を小数点の値と比較すると、負の値の場合にはいくつかの違いがあることが分かりました。私は何が問題なのか分からない。私はお互いに値を変換しようとし、また、署名などを見てみましたが、私は何が間違っているかを見つけることができません。 参考のため、xor関数でバイトを使用したいが、文字列は必要ありませんが、私のコードではいくつかのことが間違っている可能性があります。SHA512の出力で10進値と16進数が等しくない
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Formatter;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
* @author martin
*/
public class NewMain {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
Integer[][] integerBlock = new Integer[5][5];
//put some values in the matrix integerBlock
int i,j;
for(i=0; i<integerBlock.length; i++){
for(j=0; j<integerBlock.length; j++){
integerBlock[i][j] = i+j;
}
}
//convert integerBlock to a string
String str = IntToStr(integerBlock);
System.out.println("original string is : " + str);
//hash the string using SHA512
byte[] shaByteResult = SHA512(str);
//print the generated key in hex
System.out.println("byteArray2Hex method: " + byteArray2Hex(shaByteResult));
System.out.println("byteArray2Hex2 method: " + byteArray2Hex2(shaByteResult));
//print the generated key in decimal
System.out.print("Decimal values in bytes[]:");
for(i=0; i< shaByteResult.length ;i++)
System.out.print(shaByteResult[i]);
System.out.println("Compare decimal and correspondig hex");
for(i=0; i< shaByteResult.length ;i++)
System.out.println("bytes[" +i +"] = " + " decimal is " + shaByteResult[i] + " hexadecimal " + Integer.toString((shaByteResult[i] & 0xff) + 0x100, 16).substring(1));
}
public static String IntToStr(Integer[][] integerBlock){
StringBuilder SB = new StringBuilder();
int i,j;
for(i=0; i<integerBlock.length; i++){
for(j=0; j<integerBlock.length; j++){
SB.append(integerBlock[i][j].toString());
//stringBlock = stringBlock.concat(integerBlock[i][j].toString());
}
}
return SB.toString();
}
private static String byteArray2Hex(final byte[] bytes) {
Formatter formatter = new Formatter();
for (byte b : bytes) {
formatter.format("%02x", b);
}
return formatter.toString();
}
//another solution
private static String byteArray2Hex2(final byte[] bytes) {
StringBuilder sb = new StringBuilder();
int i;
for(i=0; i< bytes.length ;i++)
sb.append(Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1));
return sb.toString();
}
public static byte[] SHA512(String str){
byte[] bytes = null;
try {
MessageDigest md = MessageDigest.getInstance("SHA-512");
md.update(str.getBytes());
bytes = md.digest();
} catch (NoSuchAlgorithmException ex) {
Logger.getLogger(NewMain.class.getName()).log(Level.SEVERE, null, ex);
}
return bytes;
}
}
アウトプットは以下のとおりです。
original string is :
byteArray2Hex method: 0fe5246a2a26080194c19e86ee1e6a40ceb298194190eacace0d3b1499186220b5cd92a1bdd25f8b4023566c211cc462974c3884a128336b76a1e990fe6f3c54
byteArray2Hex2 method: 0fe5246a2a26080194c19e86ee1e6a40ceb298194190eacace0d3b1499186220b5cd92a1bdd25f8b4023566c211cc462974c3884a128336b76a1e990fe6f3c54
Decimal values in bytes[]:15-2736106423881-108-63-98-122-183010664-50-78-1042565-112-22-54-50135920-103249832-75-51-110-95-67-4695-1176435861083328-6098-1057656-124-954051107118-95-23-112-21116084Compare decimal and correspondig hex
bytes[0] = decimal is 15 hexadecimal 0f
bytes[1] = decimal is -27 hexadecimal e5
bytes[2] = decimal is 36 hexadecimal 24
bytes[3] = decimal is 106 hexadecimal 6a
bytes[4] = decimal is 42 hexadecimal 2a
bytes[5] = decimal is 38 hexadecimal 26
bytes[6] = decimal is 8 hexadecimal 08
bytes[7] = decimal is 1 hexadecimal 01
bytes[8] = decimal is -108 hexadecimal 94
bytes[9] = decimal is -63 hexadecimal c1
bytes[10] = decimal is -98 hexadecimal 9e
bytes[11] = decimal is -122 hexadecimal 86
bytes[12] = decimal is -18 hexadecimal ee
bytes[13] = decimal is 30 hexadecimal 1e
bytes[14] = decimal is 106 hexadecimal 6a
bytes[15] = decimal is 64 hexadecimal 40
bytes[16] = decimal is -50 hexadecimal ce
bytes[17] = decimal is -78 hexadecimal b2
bytes[18] = decimal is -104 hexadecimal 98
bytes[19] = decimal is 25 hexadecimal 19
bytes[20] = decimal is 65 hexadecimal 41
bytes[21] = decimal is -112 hexadecimal 90
bytes[22] = decimal is -22 hexadecimal ea
bytes[23] = decimal is -54 hexadecimal ca
bytes[24] = decimal is -50 hexadecimal ce
bytes[25] = decimal is 13 hexadecimal 0d
bytes[26] = decimal is 59 hexadecimal 3b
bytes[27] = decimal is 20 hexadecimal 14
bytes[28] = decimal is -103 hexadecimal 99
bytes[29] = decimal is 24 hexadecimal 18
bytes[30] = decimal is 98 hexadecimal 62
bytes[31] = decimal is 32 hexadecimal 20
bytes[32] = decimal is -75 hexadecimal b5
bytes[33] = decimal is -51 hexadecimal cd
bytes[34] = decimal is -110 hexadecimal 92
bytes[35] = decimal is -95 hexadecimal a1
bytes[36] = decimal is -67 hexadecimal bd
bytes[37] = decimal is -46 hexadecimal d2
bytes[38] = decimal is 95 hexadecimal 5f
bytes[39] = decimal is -117 hexadecimal 8b
bytes[40] = decimal is 64 hexadecimal 40
bytes[41] = decimal is 35 hexadecimal 23
bytes[42] = decimal is 86 hexadecimal 56
bytes[43] = decimal is 108 hexadecimal 6c
bytes[44] = decimal is 33 hexadecimal 21
bytes[45] = decimal is 28 hexadecimal 1c
bytes[46] = decimal is -60 hexadecimal c4
bytes[47] = decimal is 98 hexadecimal 62
bytes[48] = decimal is -105 hexadecimal 97
bytes[49] = decimal is 76 hexadecimal 4c
bytes[50] = decimal is 56 hexadecimal 38
bytes[51] = decimal is -124 hexadecimal 84
bytes[52] = decimal is -95 hexadecimal a1
bytes[53] = decimal is 40 hexadecimal 28
bytes[54] = decimal is 51 hexadecimal 33
bytes[55] = decimal is 107 hexadecimal 6b
bytes[56] = decimal is 118 hexadecimal 76
bytes[57] = decimal is -95 hexadecimal a1
bytes[58] = decimal is -23 hexadecimal e9
bytes[59] = decimal is -112 hexadecimal 90
bytes[60] = decimal is -2 hexadecimal fe
bytes[61] = decimal is 111 hexadecimal 6f
bytes[62] = decimal is 60 hexadecimal 3c
bytes[63] = decimal is 84 hexadecimal 54
あなたがしている適用されますJavaバイトが署名されていることを認識しているか？ – EJP