Java和Openssl为同一私钥生成不同长度的公钥

我使用java从私钥中生成公钥，如下所示

    Security.addProvider(new BouncyCastleProvider());
    KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA", "BC");
    kpg.initialize(2048);
    KeyPair kp = kpg.generateKeyPair();
    PrivateKey priv = kp.getPrivate();
    RSAPrivateCrtKey rsaCrtKey = (RSAPrivateCrtKey) priv;
    RSAPublicKeySpec keyspecPublic =  new RSAPublicKeySpec(rsaCrtKey.getModulus(), rsaCrtKey.getPublicExponent());
    KeyFactory kf = KeyFactory.getInstance("RSA");
    PublicKey  publicKey2 = kf.generatePublic(keyspecPublic);
    String publicString = Base64.getMimeEncoder().encodeToString(publicKey2.getEncoded());
                StringBuilder sb = new StringBuilder("");
    sb.append("\"-----BEGIN PUBLIC KEY-----\\n")
       .append(publicString)
       .append("\\n-----END PUBLIC KEY-----");

我使用

openssl

为相同的私钥生成公钥，如下所示：

openssl rsa -in private.key -pubout -out public.key

但上述两种方法生成不同长度的字符串作为公钥。我做错什么了吗

java代码中的公钥：

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6UkqbaGp7wOx2vrtqxmX/22ixKZcZPfZ
xXAawIst+AsWyNS+99MxnilstLIBKd6BCzJJsAa2I0ks43mnNZbkx1f1um+tQpXuTMbTh5MRprPn
jmX6aF+JXJbXATKhabTIQcCdpnrMi6scp9nWYkFdxVMfvo1gyThzfPwPgCO4eRFo1IkwZuergkl7
e0+U7WonqzFEb0joy5P78U+K8HebDW7nbS8zliq3DH2FI9yvEK3LeEN+Sa5icMWlERGv+7FCJVIH
CjBYfzaRZD9qqld/AnAEkCVt38SfSqWJECsnJYUW90WuFd8IxUVPS0TMfFMQhJFMT3eGweBOUb/b
pDm/hQIDAQAB
-----END PUBLIC KEY-----

来自openssl的公钥：

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6UkqbaGp7wOx2vrtqxmX
/22ixKZcZPfZxXAawIst+AsWyNS+99MxnilstLIBKd6BCzJJsAa2I0ks43mnNZbk
x1f1um+tQpXuTMbTh5MRprPnjmX6aF+JXJbXATKhabTIQcCdpnrMi6scp9nWYkFd
xVMfvo1gyThzfPwPgCO4eRFo1IkwZuergkl7e0+U7WonqzFEb0joy5P78U+K8Heb
DW7nbS8zliq3DH2FI9yvEK3LeEN+Sa5icMWlERGv+7FCJVIHCjBYfzaRZD9qqld/
AnAEkCVt38SfSqWJECsnJYUW90WuFd8IxUVPS0TMfFMQhJFMT3eGweBOUb/bpDm/
hQIDAQAB
-----END PUBLIC KEY-----

---

这些键是相同的，将解码为相同的字节内容

在格式化方面，Java封装在76列，OpenSSL封装在64列

如果要使换行一致，请使用重载方法，该方法允许您指定行长度并将

64

传递为

lineLength

参数

Base64.getMimeEncoder(64, new byte[] {'\r', '\n'});