com.github.downgoon.jresty.commons.security.RSAKeyPrivate Maven / Gradle / Ivy
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package com.github.downgoon.jresty.commons.security;
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.spec.RSAPrivateKeySpec;
/**
* RSA 私钥 两个大整数表示法 （大整数用十六进制表示，不用十进制表示，以免太长）
*
* 注意：私钥的两个大整数 与 公钥的两个大整数的关系 [1] 有一个是相同的； [2] 另一个是私钥能推导出公钥。
*
*/
public class RSAKeyPrivate extends RSAKeyPublic {
private String privateExponentBigIntHex;
public RSAKeyPrivate(String modulusBigIntHex, String privateExponentBigIntHex) {
super(modulusBigIntHex);
this.privateExponentBigIntHex = privateExponentBigIntHex;
}
public RSAKeyPrivate(String modulusBigIntHex, String publicExponentBigIntHex, String privateExponentBigIntHex) {
super(modulusBigIntHex, publicExponentBigIntHex);
this.privateExponentBigIntHex = privateExponentBigIntHex;
}
public String getPrivateExponentBigIntHex() {
return privateExponentBigIntHex;
}
public void setPrivateExponentBigIntHex(String privateExponentBigIntHex) {
this.privateExponentBigIntHex = privateExponentBigIntHex;
}
public PrivateKey toPrivateKey() {
int radix = 16;
BigInteger n = new BigInteger(this.modulusBigIntHex, radix);
BigInteger d = new BigInteger(this.privateExponentBigIntHex, radix);
RSAPrivateKeySpec priKeySpec = new RSAPrivateKeySpec(n, d);
KeyFactory keyFactory;
try {
keyFactory = KeyFactory.getInstance("RSA");
return keyFactory.generatePrivate(priKeySpec);
} catch (Exception ex) {
throw new IllegalStateException("No RSA Provider", ex);
}
}
}