keys.py 文件源码

def is_valid_ssh_rsa_public_key(openssh_pubkey):
    # http://stackoverflow.com/questions/2494450/ssh-rsa-public-key-validation-using-a-regular-expression # pylint: disable=line-too-long
    # A "good enough" check is to see if the key starts with the correct header.
    import struct
    try:
        from base64 import decodebytes as base64_decode
    except ImportError:
        # deprecated and redirected to decodebytes in Python 3
        from base64 import decodestring as base64_decode

    parts = openssh_pubkey.split()
    if len(parts) < 2:
        return False
    key_type = parts[0]
    key_string = parts[1]

    data = base64_decode(key_string.encode())  # pylint:disable=deprecated-method
    int_len = 4
    str_len = struct.unpack('>I', data[:int_len])[0]  # this should return 7
    return data[int_len:int_len + str_len] == key_type.encode()