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with the encoded public or the private half
under the selected format.
format: 'DER' (PKCS#1) or 'PEM' (RFC1421)
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S( s# Import an RSA key (public or private half).
externKey: the RSA key to import, encoded as bytes.
The key can be in DER (PKCS#1) or in unencrypted
PEM format (RFC1421).
Raises a ValueError/IndexError if the given key cannot be parsed.
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