从 BigInteger 转换为八位字节？

发布于 2024-10-11 20:37:22 字数 398 浏览 3 评论 0原文

我正在尝试手动创建 Web 服务调用的签名标签。我从密钥库访问了证书并访问了证书的公钥。我现在在将 RSAKeyValue 转换为 ds:CryptoBinary 类型时遇到问题。代码返回泥数和指数的 Biginteger 值，我正在寻找一种方法或算法将它们转换为八位字节，然后转换为 Bas64。这是我的代码

RSAPublicKey rsaKey  = (RSAPublicKey)certificate.getPublicKey();
customSignature.Modulus = rsaKey.getModulus(); 
customSignature.Exponent = rsaKey.getPublicExponent();

Java 中是否有任何解决方案可用于将整数转换为八位字节表示形式？

原文

I am trying to manually create the signature tag for a web service call. I accessed the certificate from the keystore and accessed the public key for the certificate. I now have the problem in converting the RSAKeyValue to ds:CryptoBinary type. Code returns the Biginteger value for mudulus and exponent and I am looking for a method or algorithm to convert them to octets and then converting to Bas64. Here is my code

RSAPublicKey rsaKey  = (RSAPublicKey)certificate.getPublicKey();
customSignature.Modulus = rsaKey.getModulus(); 
customSignature.Exponent = rsaKey.getPublicExponent();

Is there any solution available in Java for converting the integers to octet representation?

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怀里藏娇 2024-10-18 20:37:22

使用 apache commons 编解码器框架尝试以下代码：

BigInteger modulus = rsaKey.getModulus();
org.apache.commons.codec.binary.Base64.encodeBase64String(modulus.toByteArray());

Try following code using apache commons codec framework:

BigInteger modulus = rsaKey.getModulus();
org.apache.commons.codec.binary.Base64.encodeBase64String(modulus.toByteArray());

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吹梦到西洲 2024-10-18 20:37:22

不幸的是，modulus.toByteArray() 并没有直接映射到 XML 数字签名的 ds:CryptoBinary 类型，还需要剥离前导零八位字节。在进行 Base64 编码之前，您需要执行以下操作

byte[] modulusBytes = modulus.toByteArray();
int numLeadingZeroBytes = 0;
while( modulusBytes[numLeadingZeroBytes] == 0 )
    ++numLeadingZeroBytes;
if ( numLeadingZeroBytes > 0 ) {
    byte[] origModulusBytes = modulusBytes;
    modulusBytes = new byte[origModulusBytes.length - numLeadingZeroBytes];
    System.arraycopy(origModulusBytes,numLeadingZeroBytes,modulusBytes,0,modulusBytes.length);
}

Unfortunatly, modulus.toByteArray() does not map directly to the XML Digital Signature's ds:CryptoBinary type, which also requires stripping leading zero octets. You need to do something like the following, before you do the base64 encoding

byte[] modulusBytes = modulus.toByteArray();
int numLeadingZeroBytes = 0;
while( modulusBytes[numLeadingZeroBytes] == 0 )
    ++numLeadingZeroBytes;
if ( numLeadingZeroBytes > 0 ) {
    byte[] origModulusBytes = modulusBytes;
    modulusBytes = new byte[origModulusBytes.length - numLeadingZeroBytes];
    System.arraycopy(origModulusBytes,numLeadingZeroBytes,modulusBytes,0,modulusBytes.length);
}

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