PyJWT，期待PEM格式的密钥

我从Layer复制粘贴此代码：

https://github.com/layerhq/support/blob/master/identity-services-samples/python/controller.py

我被告知另外两个人在mac机器上成功运行它 . 我正在使用Windows 7，我得到TypeError：在运行代码时期望PEM格式的密钥：

#Read RSA key
root = os.path.dirname("__file__")
with open(os.path.join(root, RSA_KEY_PATH), 'r') as rsa_priv_file:

    #Not sure about adding the utf-8 AT ALL
    priv_rsakey = RSA.importKey(rsa_priv_file.read())

#Create identity token
#Make sure you have PyJWT and PyCrypto libraries installed and imported
identityToken = jwt.encode(
    payload={
        "iss": PROVIDER_ID,                 # String - The Provider ID found in the Layer Dashboard
        "prn": user_id,                     # String - Provider's internal ID for the authenticating user
        "iat": datetime.datetime.now(),              # Integer - Time of Token Issuance in RFC 3339 seconds
        "exp": datetime.datetime.utcnow() + datetime.timedelta(seconds=30),   # Integer - Arbitrary Token Expiration in RFC 3339 seconds
        "nce": nonce                        # The nonce obtained via the Layer client SDK.
    },
    key=priv_rsakey,
    headers = {
        "typ": "JWS",               # String - Expresses a MIME Type of application/JWS
        "alg": "RS256",             # String - Expresses the type of algorithm used to sign the token, must be RS256
        "cty": "layer-eit;v=1",     # String - Express a Content Type of Layer External Identity Token, version 1
        "kid": KEY_ID               # String - Private Key associated with "layer.pem", found in the Layer Dashboard
    },
    algorithm="RS256"
)

print identityToken

我不知道我的PEM格式化密钥应该如何，但它如下（我在发布之前手动更改了密钥）：

----- BEGIN RSA私钥----- MIICWwIBAAKBgQCWjLl4Hw8PLto2wGGxrpJ0afHQDX2iJ / xqNXyybgG0GxZI344u HXxn / bRzH4Z39pw3vGKrvd21hyln5 / qaJGoCSb7QHAtdz8pfNF3t96DBcDh2aDMe 8W / 4mZqiDi2zNqxAnmuv6vSKnU3UyqFpuPCdXFiA8Gt8OqHHLks8MYYjwIDAQAB AoGAII9i9YXSHfiGHV1SQ7l7102qjNK HzoCr33N8FE2cRuCoFQpTfP2mg8W3ect焦耳/ h4JN3LgVVZBA tdtiptHi3rF1W4yNs4pO3xYLJZHoCdG5CjHoMzEf2VwixK6˚F8FCCNErG8yxCpcPDH8D0NjMFzJ0t1kwsBQ0w5iSvdY3qtLECQQDgQPVk6W79kNS9 gBoZAB71yJazQpCwJ2SLYj6aFNZDX1Jpg5GRoVOs59gl13UF 9AwJf5MCIMbqaly T1 / 4aBa1AkEAq9y0DwSjNLl26XeBhWycQJZUu5lsJVqJcx2q0GsKGx5Ntei / 48bD ldi7ZXWdA6o4OOV2GpW1hX7vssPHBXBYswJAMGXUkDLRAWiAgWVkPIEKLYFdBNMY 5uuZh3tsh1R36ZJo9tyuTf / DT026GHCnkOMHy1xnxYEQyqeTKlh3HeVZAQJAIQYC r1QTzEDLAaeOAsZQ6 / Q3Cek4545TBgSwWuYGhhl3kznLDYiW8oc30xIbfqXJsd0d qZQU0jcG9hG6f2gMEwJALHz0jXhpjo UygUjdKbW / mfKRirSYiGLCYQHiNc4aaDe omr9XLu9Hc6aI9RVGIFMnygaI9Ahu2mNkpj5UoaTTA == ----- END RSA PRIVATE KEY -----

我找不到任何有效的问题解决方案 . 有人有主意吗？谢谢