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Wrap a private key into a PKCS#8 blob (clear or encrypted).
Args:
private_key (byte string):
The private key encoded in binary form. The actual encoding is
algorithm specific. In most cases, it is DER.
key_oid (string):
The object identifier (OID) of the private key to wrap.
It is a dotted string, like ``1.2.840.113549.1.1.1`` (for RSA keys).
passphrase (bytes string or string):
The secret passphrase from which the wrapping key is derived.
Set it only if encryption is required.
protection (string):
The identifier of the algorithm to use for securely wrapping the key.
The default value is ``PBKDF2WithHMAC-SHA1AndDES-EDE3-CBC``.
prot_params (dictionary):
Parameters for the protection algorithm.
+------------------+-----------------------------------------------+
| Key | Description |
+==================+===============================================+
| iteration_count | The KDF algorithm is repeated several times to|
| | slow down brute force attacks on passwords |
| | (called *N* or CPU/memory cost in scrypt). |
| | The default value for PBKDF2 is 1000. |
| | The default value for scrypt is 16384. |
+------------------+-----------------------------------------------+
| salt_size | Salt is used to thwart dictionary and rainbow |
| | attacks on passwords. The default value is 8 |
| | bytes. |
+------------------+-----------------------------------------------+
| block_size | *(scrypt only)* Memory-cost (r). The default |
| | value is 8. |
+------------------+-----------------------------------------------+
| parallelization | *(scrypt only)* CPU-cost (p). The default |
| | value is 1. |
+------------------+-----------------------------------------------+
key_params (DER object):
The algorithm parameters associated to the private key.
It is required for algorithms like DSA, but not for others like RSA.
randfunc (callable):
Random number generation function; it should accept a single integer
N and return a string of random data, N bytes long.
If not specified, a new RNG will be instantiated
from :mod:`Cryptodome.Random`.
Return:
The PKCS#8-wrapped private key (possibly encrypted), as a byte string.
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� � j }t |� � dk rd}n: t � � � |d � � d}n# |d }Y nxY wt � � � |d � � j } || |fS )aH Unwrap a private key from a PKCS#8 blob (clear or encrypted).
Args:
p8_private_key (byte string):
The private key wrapped into a PKCS#8 blob, DER encoded.
passphrase (byte string or string):
The passphrase to use to decrypt the blob (if it is encrypted).
Return:
A tuple containing
#. the algorithm identifier of the wrapped key (OID, dotted string)
#. the private key (byte string, DER encoded)
#. the associated parameters (byte string, DER encoded) or ``None``
Raises:
ValueError : if decoding fails
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