DSA签名在java与.net平台的互联互通问题(2)

 

//DSA JAVA平台签名转成.net可以认识的签名

public static byte[] changeDSAJava2net(byte[] Content) {

byte[] RByte = new byte[40];

// byte[] SByte = new byte[20];

// byte[] Content = DERStr.getBytes();

 

int IntRLength = Content[3];

int j = 0;

// 第一段是 20个字符

if (IntRLength == 20) {

for (int i = 0; i < 20; i++) {

RByte[i] = Content[4 + i];

}

j = 24;

} else if (IntRLength > 20) {

// 第五位数字是0

for (int i = 0; i < 20; i++) {

RByte[i] = Content[5 + i];

}

j = 25;

} else {

// IntRLength 19 NotEnough 1

int NotEnough = 20 - IntRLength;

for (int i = 0; i < NotEnough; i++) {

// 不足数据用0补齐

RByte[i] = 0;

}

for (int i = 0; i < IntRLength; i++) {

RByte[NotEnough + i] = Content[4 + i];

}

j = 24 - NotEnough;

}

 

int IntSLength = Content[j + 1];

if (IntSLength == 20) {

for (int i = 0; i < 20; i++) {

RByte[i + 20] = Content[j + 2 + i];

}

} else if (IntSLength > 20) {

for (int i = 0; i < 20; i++) {

RByte[i + 20] = Content[j + 3 + i];

}

} else {

int NotEnough = 20 - IntSLength;

for (int i = 0; i < NotEnough; i++) {

RByte[i + 20] = 0;

}

for (int i = 0; i < IntSLength; i++) {

RByte[NotEnough + i + 20] = Content[j + 2 + i];

}

}

return RByte;

}

 

网上关于DSA的签名的实现代码很多 在此不再赘述 有疑问可以去问问百度或google

再次感谢徐某人！