如何从字符串中获取SSH公钥的MD5指纹(签名

import base64
import hashlib

def get_ssh_public_key_md5_fingerprint(public_key_string):
    # 提取公钥数据
    start_index = public_key_string.find(' ') + 1
    end_index = public_key_string.rfind(' ')
    public_key_data = public_key_string[start_index:end_index]

    # Base64解码
    public_key_bytes = base64.b64decode(public_key_data)

    # 计算MD5指纹
    md5_hash = hashlib.md5(public_key_bytes).hexdigest()

    return md5_hash

# 示例用法
public_key_string = "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC3...xyz user@example.com"
md5_fingerprint = get_ssh_public_key_md5_fingerprint(public_key_string)
print(md5_fingerprint)