问题描述
动机:我想将哈希(MD5/SHA1 等)转换为十进制整数，以便在 Code128C 中制作条形码.为简单起见，我希望所有结果(大)数字都是正数.
Motivation:I would like to convert hashes (MD5/SHA1 etc) into decimal integers for the purpose of making barcodes in Code128C.For simplicity, I prefer all the resulting (large) numbers to be positive.
我可以在 C# 中将 byte[] 转换为 BigInteger...
到目前为止我所拥有的样本:
I am able to convert byte[] to BigInteger in C#...
Sample from what I have so far:
byte[] data;
byte[] result;
BigInteger biResult;
result = shaM.ComputeHash(data);
biResult = new BigInteger(result);
但是(这里生疏的 CS)我是否正确，字节数组总是可以用两种方式解释:
But (rusty CS here) am I correct that a byte array can always be interpreted in two ways:
- (A):作为有符号数
- (B):作为无符号数
是否可以从 C# 中的 byte[] 生成 UNSIGNED BigInteger?
我应该在字节[]的前面简单地添加一个 0x00(零字节)吗?
Should I simply prepend a 0x00 (zero byte) to the front of the byte[]?
感谢 AakashM、Jon 和 Adam Robinson，附加一个零字节实现了我所需要的.
Thank you to AakashM, Jon and Adam Robinson, appending a zero byte achieved what I needed.
我应该做的主要事情是阅读 BigInteger(byte[]) 构造函数的详细文档，然后我就会看到有关如何通过附加零字节来限制为正数的部分.
The main thing I should have done was to read the detailed doc of the BigInteger(byte[]) constructor, then I would have seen the sections about how to restrict to positive numbers by appending the zero byte.
推荐答案
对BigInteger 构造函数 的说明表明您可以确保任何BigInteger 从byte[]00 字节添加到数组末尾，则/code> 是无符号的.
The remarks for the BigInteger constructor state that you can make sure any BigInteger created from a byte[] is unsigned if you append a 00 byte to the end of the array before calling the constructor.
注意:BigInteger 构造函数期望数组采用小端顺序.如果您希望结果 BigInteger 具有特定值，请记住这一点.
Note: the BigInteger constructor expects the array to be in little-endian order. Keep that in mind if you expect the resulting BigInteger to have a particular value.
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