问

将RSA公钥转换为PEM格式

啦啦郭嘿发布于 2023-02-09 19:39

我想转换 -

RSA Public Key
            modulus: 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
    public exponent: 10001

至

无论是使用标准Java还是BouncyCastle,任何指针都会有所帮助.

1 个回答

这很简单,您可以使用BigInteger格式显示的valus创建一个RSAPublicKeySpec.然后从中创建一个公钥,获取编码的字节数组并使用base64对其进行编码.你唯一要做的就是添加"BEGIN"和"END"块并纠正换行符.

KeyFactory f = KeyFactory.getInstance("RSA");
BigInteger modulus = new BigInteger(
        "9699c3c4406464638d2b30dbed44ddee485b5f9a3d7491434049440d34eb1759376a8bac"
                + "0e37cee5c18df69acfc60d7252634fd15c26ab2afa16ca831598381356209acea9cea9467acdbd2a9b6d8e7b38d1baa826b1fb"
                + "ce2c185ba324bd17c9fdd6558eb57a082ca8c37fccaa86d4f9ffdc4e5d4a4a7f8e5f5410f835f98c64776cfc3421f19db99f140"
                + "590d871e5e53efce6be8b9daffa3ab876005a48d249378ecc766281e931921e2ef0105fb64fa26952f91ad1627fedbb429aba75"
                + "d3788bf7c0324f9fc1b48a9f5490ee0ab42e9e4c88ea564943aa5d9f43f7421b7d28788496daf7426f2e193199d4a525b38f0f3f"
                + "68ab3c37b09fba2cc21f38e7a769", 16);
BigInteger exp = new BigInteger("10001", 16);
RSAPublicKeySpec spec = new RSAPublicKeySpec(modulus, exp);
PublicKey pub = f.generatePublic(spec);
byte[] data = pub.getEncoded();
String base64encoded = new String(Base64.encode(data));
System.out.println(base64encoded);

请注意,使用过的Base64编码是BouncyCastle(org.bouncycastle.util.encoders.Base64)中的编码.还有其他可以完成这项工作的人.AFAIR中的一些已经支持自动换行.

2023-02-09 19:42 回答

xiaohigh

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