作为标题,如何在Java中从SSH RSA公钥计算指纹?我从sample.pub获得了一个rsaPublicKey对象,并使用Apache Commons Codec DigestUtils.sha256Hex(rsaPublicKey.getEncoded());
库计算了指纹,但在使用ssh-keygen命令ssh-keygen -E sha256 -lf sample.pub
sample.pub时,我得到了不同的指纹,如下所示ssh-rsa AAAAB3NzaC1yc2EAAAABJQAAAQEAsuVPKUpLYSCNVIHD+e6u81IUznkDoiOvn/t56DRcutRc4OrNsZZ+Lmq49T4JCxUSmaT8PeLGS/IC946CNQzFwMh++sVoc19UUkZtRaDgiYn+HkYk8VW4IFI1dKfXomKSbX/lB+ohzLzXLVP2/UJgfBmdaE10k+6b+/Yd8YGXIeS8/Z9zToHPo0ORNSGIolgq3xMXUtfAOK/0KC6IFc/FuvuOSAG1UWup91bcm5GSXv4BWWjgFtOxCLIknYjsDah4qfrP8Olp5eUDhn/65xRcZsmRXoYe1ylhlSjJoPDFWXVs9npwqQmi3JaZtgg7xJxMu1ZcdpYxoj280zM9/6w1Lw==
发布于 2019-12-27 21:58:54
使用此命令从您的公钥计算指纹:
/**
* Calculate fingerprint
*
* @param publicKey public key
* @return fingerprint
*/
public static String calculateFingerprint(String publicKey) {
String derFormat = publicKey.split(" ")[1].trim();
MessageDigest messageDigest = null;
try {
messageDigest = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
log.error(e.getMessage(), e);
throw new RuntimeException("Could not get fingerprint", e);
}
byte[] digest = messageDigest.digest(Base64.getDecoder().decode(derFormat));
final StringBuilder toRet = new StringBuilder();
for (int i = 0; i < digest.length; i++) {
if (i != 0) toRet.append(":");
int b = digest[i] & 0xff;
String hex = Integer.toHexString(b);
if (hex.length() == 1) toRet.append("0");
toRet.append(hex);
}
return toRet.toString();
}
这将为您提供与以下内容相同的结果:
ssh-keygen -E md5 -l -f id_rsa.pub
https://stackoverflow.com/questions/51059782
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