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ASN.1 type classes for public and private keys. Exports the following items:
- DSAPrivateKey()
- ECPrivateKey()
- EncryptedPrivateKeyInfo()
- PrivateKeyInfo()
- PublicKeyInfo()
- RSAPrivateKey()
- RSAPublicKey()
Other type classes are defined that help compose the types listed above.
� )�unicode_literals�division�absolute_import�print_functionN� )�SECP192R1_BASE_POINT�SECP224R1_BASE_POINT�SECP256R1_BASE_POINT�SECP384R1_BASE_POINT�SECP521R1_BASE_POINT�
PrimeCurve�
PrimePoint)�unwrap)� type_name�str_cls�byte_cls)�_ForceNullParameters�DigestAlgorithm�EncryptionAlgorithm)�Any� Asn1Value� BitString�Choice�Integer�IntegerOctetString�Null�ObjectIdentifier�OctetBitString� OctetString�ParsableOctetString�ParsableOctetBitString�Sequence�
SequenceOf�SetOf)�int_from_bytes� int_to_bytesc @ s& e Zd ZdZdefdefdefgZdS )�OtherPrimeInfoz=
Source: https://tools.ietf.org/html/rfc3447#page-46
�primeZexponent� coefficientN)�__name__�
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Source: https://tools.ietf.org/html/rfc3447#page-46
N)r) r* r+ r, r& � _child_specr. r. r. r/ r0 B s r0 c @ s e Zd ZdZddd�ZdS )�RSAPrivateKeyVersionzX
Original Name: Version
Source: https://tools.ietf.org/html/rfc3447#page-45
z two-primeZmulti)r r N)r) r* r+ r, �_mapr. r. r. r/ r2 J s r2 c
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RSAPrivateKeyz=
Source: https://tools.ietf.org/html/rfc3447#page-45
�version�modulus�public_exponentZprivate_exponentZprime1Zprime2Z exponent1Z exponent2r( Zother_prime_infos�optionalTN)r) r* r+ r, r2 r r0 r- r. r. r. r/ r4 V s r4 c @ s e Zd ZdZdefdefgZdS )� RSAPublicKeyz=
Source: https://tools.ietf.org/html/rfc3447#page-44
r6 r7 N)r) r* r+ r, r r- r. r. r. r/ r9 i s r9 c @ s8 e Zd ZdZdefdefdefdefdefdefgZdS ) �
DSAPrivateKeya&
The ASN.1 structure that OpenSSL uses to store a DSA private key that is
not part of a PKCS#8 structure. Reversed engineered from english-language
description on linked OpenSSL documentation page.
Original Name: None
Source: https://www.openssl.org/docs/apps/dsa.html
r5 �p�q�g�
public_key� private_keyN)r) r* r+ r, r r- r. r. r. r/ r: t s r: c @ s$ e Zd ZdZedd� �Zdd� ZdS )�_ECPointa
In both PublicKeyInfo and PrivateKeyInfo, the EC public key is a byte
string that is encoded as a bit string. This class adds convenience
methods for converting to and from the byte string to a pair of integers
that are the X and Y coordinates.
c C sj t t�t�|d�d ��}t t�t�|d�d ��}t||�}d}|t||d�7 }|t||d�7 }| |�S )a
Creates an ECPoint object from the X and Y integer coordinates of the
point
:param x:
The X coordinate, as an integer
:param y:
The Y coordinate, as an integer
:return:
An ECPoint object
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z_ECPoint.from_coordsc C s� | j }|dd� }|dkrZ|dd� }t|�d }t|d|� �}t||d� �}||fS |tddg�krvttd���ttd ���dS )
z�
Returns the X and Y coordinates for this EC point, as native Python
integers
:return:
A 2-element tuple containing integers (X, Y)
r r rB NrA � � zQ
Invalid EC public key - first byte is incorrect
z|
Compressed representations of EC public keys are not supported due
to patent US6252960
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first_byteZ remainingZ field_lenrJ rK r. r. r/ � to_coords� s z_ECPoint.to_coordsN)r) r* r+ r, � classmethodrL rU r. r. r. r/ r@ � s r@ c @ s e Zd ZdS )�ECPointN)r) r* r+ r. r. r. r/ rW � s rW c @ s e Zd ZdS )�ECPointBitStringN)r) r* r+ r. r. r. r/ rX � s rX c @ s e Zd ZdZdddd�ZdS )�SpecifiedECDomainVersionz:
Source: http://www.secg.org/sec1-v2.pdf page 104
ZecdpVer1ZecdpVer2ZecdpVer3)r rA � N)r) r* r+ r, r3 r. r. r. r/ rY � s rY c @ s e Zd ZdZddd�ZdS )� FieldTypezR
Original Name: None
Source: http://www.secg.org/sec1-v2.pdf page 101
� prime_field�characteristic_two_field)z1.2.840.10045.1.1z1.2.840.10045.1.2N)r) r* r+ r, r3 r. r. r. r/ r[ � s r[ c @ s e Zd ZdZdddd�ZdS )�CharacteristicTwoBasiszR
Original Name: None
Source: http://www.secg.org/sec1-v2.pdf page 102
�gn_basis�tp_basis�pp_basis)z1.2.840.10045.1.2.1.1z1.2.840.10045.1.2.1.2z1.2.840.10045.1.2.1.3N)r) r* r+ r, r3 r. r. r. r/ r^ � s r^ c @ s& e Zd ZdZdefdefdefgZdS )� Pentanomialz:
Source: http://www.secg.org/sec1-v2.pdf page 102
Zk1Zk2Zk3N)r) r* r+ r, r r- r. r. r. r/ rb � s rb c @ s6 e Zd ZdZdefdefdefgZdZe ee
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Original Name: Characteristic-two
Source: http://www.secg.org/sec1-v2.pdf page 101
�m�basis�
parameters)re rf )r_ r` ra N) r) r* r+ r, r r^ r r- � _oid_pairr rb �
_oid_specsr. r. r. r/ rc s
rc c @ s. e Zd ZdZdefdefgZdZee d�Z
dS )�FieldIDz:
Source: http://www.secg.org/sec1-v2.pdf page 100
�
field_typerf )rj rf )r\ r] N) r) r* r+ r, r[ r r- rg r rc rh r. r. r. r/ ri s
ri c @ s, e Zd ZdZdefdefdeddifgZdS )�Curvez:
Source: http://www.secg.org/sec1-v2.pdf page 104
�a�b�seedr8 TN)r) r* r+ r, r r r- r. r. r. r/ rk - s rk c
@ sJ e Zd ZdZdefdefdefdefdefdedd ifd
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Source: http://www.secg.org/sec1-v2.pdf page 103
r5 �field_id�curve�base�orderZcofactorr8 T�hashN) r) r* r+ r, rY ri rk rW r r r- r. r. r. r/ ro 9 s ro c ) @ sf e Zd ZdZdddddddd d
d d d
ddddddddddddddd d d d d d!d"d#d$d%d&d'd(d)d*�(Zd+S ),�
NamedCurvez�
Various named curves
Original Name: None
Source: https://tools.ietf.org/html/rfc3279#page-23,
https://tools.ietf.org/html/rfc5480#page-5
Z
c2pnb163v1Z
c2pnb163v2Z
c2pnb163v3Z
c2pnb176w1Z
c2tnb191v1Z
c2tnb191v2Z
c2tnb191v3Z
c2onb191v4Z
c2onb191v5Z
c2pnb208w1Z
c2tnb239v1Z
c2tnb239v2Z
c2tnb239v3Z
c2onb239v4Z
c2onb239v5Z
c2pnb272w1Z
c2pnb304w1Z
c2tnb359v1Z
c2pnb368w1Z
c2tnb431r1Z
prime192v2Z
prime192v3Z
prime239v1Z
prime239v2Z
prime239v3Z sect163k1Z sect163r2� secp192r1� secp224r1Z sect233k1� secp256r1Z sect233r1Z sect283k1Z sect283r1� secp384r1Z sect409k1Z sect409r1� secp521r1Z sect571k1Z sect571r1)(z1.2.840.10045.3.0.1z1.2.840.10045.3.0.2z1.2.840.10045.3.0.3z1.2.840.10045.3.0.4z1.2.840.10045.3.0.5z1.2.840.10045.3.0.6z1.2.840.10045.3.0.7z1.2.840.10045.3.0.8z1.2.840.10045.3.0.9z1.2.840.10045.3.0.10z1.2.840.10045.3.0.11z1.2.840.10045.3.0.12z1.2.840.10045.3.0.13z1.2.840.10045.3.0.14z1.2.840.10045.3.0.15z1.2.840.10045.3.0.16z1.2.840.10045.3.0.17z1.2.840.10045.3.0.18z1.2.840.10045.3.0.19z1.2.840.10045.3.0.20z1.2.840.10045.3.1.2z1.2.840.10045.3.1.3z1.2.840.10045.3.1.4z1.2.840.10045.3.1.5z1.2.840.10045.3.1.6z 1.3.132.0.1z 1.3.132.0.15z1.2.840.10045.3.1.1z 1.3.132.0.33z 1.3.132.0.26z1.2.840.10045.3.1.7z 1.3.132.0.27z 1.3.132.0.16z 1.3.132.0.17z 1.3.132.0.34z 1.3.132.0.36z 1.3.132.0.37z 1.3.132.0.35z 1.3.132.0.38z 1.3.132.0.39N)r) r* r+ r, r3 r. r. r. r/ ru I sR ru c @ s& e Zd ZdZdefdefdefgZdS )�ECDomainParametersz:
Source: http://www.secg.org/sec1-v2.pdf page 102
� specified�named� implicit_caN)r) r* r+ r, ro ru r Z
_alternativesr. r. r. r/ r{ � s r{ c @ s e Zd ZdZddiZdS )�ECPrivateKeyVersionzR
Original Name: None
Source: http://www.secg.org/sec1-v2.pdf page 108
r Z
ecPrivkeyVer1N)r) r* r+ r, r3 r. r. r. r/ r � s r c @ s@ e Zd ZdZdefdefdedddd�fd edd
dd�fgZd S ) � ECPrivateKeyz:
Source: http://www.secg.org/sec1-v2.pdf page 108
r5 r? rf Zexplicitr T)�tag_type�tagr8 r> r N) r) r* r+ r, r r r{ rX r- r. r. r. r/ r� � s
r� c @ s& e Zd ZdZdefdefdefgZdS )� DSAParamsz�
Parameters for a DSA public or private key
Original Name: Dss-Parms
Source: https://tools.ietf.org/html/rfc3279#page-9
r; r< r= N)r) r* r+ r, r r- r. r. r. r/ r� � s r� c @ s& e Zd ZdZdefdedeifgZdS )� Attributezq
Source: https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-X.501-198811-S!!PDF-E&type=items page 8
�type�values�specN)r) r* r+ r, r r# r r- r. r. r. r/ r� � s r� c @ s e Zd ZdZeZdS )�
Attributesz<
Source: https://tools.ietf.org/html/rfc5208#page-3
N)r) r* r+ r, r� r1 r. r. r. r/ r� � s r� c @ s e Zd ZdZdddd�ZdS )�PrivateKeyAlgorithmIdz�
These OIDs for various public keys are reused when storing private keys
inside of a PKCS#8 structure
Original Name: None
Source: https://tools.ietf.org/html/rfc3279
�rsa�dsa�ec)z1.2.840.113549.1.1.1z1.2.840.10040.4.1z1.2.840.10045.2.1N)r) r* r+ r, r3 r. r. r. r/ r� � s r� c @ s4 e Zd ZdZdefdeddifgZdZee d�Z
dS ) �PrivateKeyAlgorithmzm
Original Name: PrivateKeyAlgorithmIdentifier
Source: https://tools.ietf.org/html/rfc5208#page-3
� algorithmrf r8 T)r� rf )r� r� N) r) r* r+ r, r� r r- rg r� r{ rh r. r. r. r/ r� � s r� c @ s� e Zd ZdZdefdefdefdedddd �fgZd
d � Z de iZ
d Z d Z d Z
d Zed
d� �Zdd� Zdd� Zedd� �Zedd� �Zedd� �Zedd� �Zedd � �Zed d � �Zed d � �Zed!d"� �Zd S )#�PrivateKeyInfoz<
Source: https://tools.ietf.org/html/rfc5208#page-3
r5 �private_key_algorithmr? Z
attributesZimplicitr T)r� r� r8 c C s | d d j }tttd�| S )Nr� r� )r� r� r� )rO r4 r r� )rS r� r. r. r/ �_private_key_spec� s
z PrivateKeyInfo._private_key_specNc C s@ t |t�s&t |t�s&ttdt|����|dkrJt |t�sBt�|�}t� }n�|dkr�t |t �sft �|�}t
� }|d |d< |d |d< |d |d< |d }|d }nH|d kr�t |t �s�t �|�}n|� � }|d
}|d
= nt
td t|����t� }t|�|d < ||d
< | � }||_td
�|d< ||d< ||d< |dk�r<||_|S )a'
Wraps a private key in a PrivateKeyInfo structure
:param private_key:
A byte string or Asn1Value object of the private key
:param algorithm:
A unicode string of "rsa", "dsa" or "ec"
:return:
A PrivateKeyInfo object
zX
private_key must be a byte string or Asn1Value, not %s
r� r� r; r< r= r> r? r� rf zU
algorithm must be one of "rsa", "dsa", "ec", not %s
r� r r5 r� )�
isinstancer r � TypeErrorr r r4 �loadr r: r� r� �copyrR �reprr� r� �
_algorithmr � _public_key)rI r? r� �paramsr> Zprivate_key_algo� containerr. r. r/ �wrap sJ
zPrivateKeyInfo.wrapc
C sf | j dkr:| d d }tt|d j| d jj|d j��S | j dkrd| d j}t|d |d d
��S | j d k�rb| j\}}|d kr�ttd
���|dk�r|d d dkr�ttd���t |d d t
|d d �t
|d d ��}| d d j d � � \}}t
|||�}n6|dk�r>|dk�r*ttd|���tttttd�| }|| d jd j } t�| j| j�S dS )z�
Computes the public key corresponding to the current private key.
:return:
For RSA keys, an RSAPublicKey object. For DSA keys, an Integer
object. For EC keys, an ECPointBitString.
r� r� rf r= r? r; r� r6 r7 )r6 r7 r� r~ z�
Unable to compute public key for EC key using Implicit CA
parameters
r| rp rj r] z�
Unable to compute public key for EC key over a
characteristic two field
rq rl rm rr r} )rv rw rx ry rz z�
Unable to compute public key for EC named curve %s,
parameters not currently included
N)r� r �powrO �parsedr9 rq rR r r r$ �chosenrU r
r r r r
r rX rL rJ rK )
rS r� �keyZ
curve_typeZdetailsrq Zbase_xZbase_yZ
base_pointZ public_pointr. r. r/ �_compute_public_keyL sN
z"PrivateKeyInfo._compute_public_keyc C s� | j dkr| d jS | j dkrT| d d }td|d |d |d | j| d jd
��S | j d kr�| d j}| d d |d< | j|d < |S d
S )z�
Unwraps the private key into an RSAPrivateKey, DSAPrivateKey or
ECPrivateKey object
:return:
An RSAPrivateKey, DSAPrivateKey or ECPrivateKey object
r� r? r� r� rf r r; r< r= )r5 r; r< r= r> r? r� r> N)r� r� r: r> )rS r� �outputr. r. r/ r � s
zPrivateKeyInfo.unwrapc C sP | j dkr ttd| j �� ���| d d }|j}|jdkr@d}n|j}|j|fS )a#
Returns information about the curve used for an EC key
:raises:
ValueError - when the key is not an EC key
:return:
A two-element tuple, with the first element being a unicode string
of "implicit_ca", "specified" or "named". If the first element is
"implicit_ca", the second is None. If "specified", the second is
an OrderedDict that is the native version of SpecifiedECDomain. If
"named", the second is a unicode string of the curve name.
r� zK
Only EC keys have a curve, this key is %s
r� rf r~ N)r� rR r �upperr� �namerO )rS r� r� �valuer. r. r/ rq � s
zPrivateKeyInfo.curvec C sL | j dkr ttd| j �� ���t�| d d d jd�d }|dkrHd S d
S ) z�
Returns the name of the family of hash algorithms used to generate a
DSA key
:raises:
ValueError - when the key is not a DSA key
:return:
A unicode string of "sha1" or "sha2"
r� zt
Only DSA keys are generated using a hash algorithm, this key is
%s
r� rf r< rA � � �sha1�sha2)r� rR r r� rE rG rO )rS �byte_lenr. r. r/ � hash_algo� s
zPrivateKeyInfo.hash_algoc C s | j dkr| d d j| _ | j S )zO
:return:
A unicode string of "rsa", "dsa" or "ec"
Nr� r� )r� rO )rS r. r. r/ r� � s
zPrivateKeyInfo.algorithmc C s� | j dkr�| jdkr&| d jd j}n8| jdkrD| d d d j}n| jd kr^| d jd j}tt�t�|d
���| _ | j d }|d kr�| j d | 7 _ | j S )
zU
:return:
The bit size of the private key, as an integer
Nr� r? r6 r� r� rf r; r� rA r� r )� _bit_sizer� r� rO rD rE rF rG )rS r' r6 r. r. r/ �bit_size� s
zPrivateKeyInfo.bit_sizec C s t t�| jd ��S )zV
:return:
The byte size of the private key, as an integer
r� )rD rE rF r� )rS r. r. r/ � byte_size
s zPrivateKeyInfo.byte_sizec C sR | j dkrL| jdkrB| d j}|d r6|d �� | _ qL| �� | _ n
| �� | _ | j S )z�
:return:
If an RSA key, an RSAPublicKey object. If a DSA key, an Integer
object. If an EC key, an ECPointBitString object.
Nr� r? r> )r� r� r� �untagr� )rS r� r. r. r/ r> s
zPrivateKeyInfo.public_keyc C s t | j| d d d�| jd��S )z\
:return:
A PublicKeyInfo object derived from this private key.
r� rf )r� rf )r� r> )�
PublicKeyInfor� r> )rS r. r. r/ �public_key_info* s z PrivateKeyInfo.public_key_infoc C sj | j dk�rd| d d }| d j}| jdkrFd|d j|d jf }n�| jd kr|| j}d
|d j|d j|d
j|jf }n�| jdk�r>|d j}|dkr�| jj}|jdkr�d|jj }|�d�}||7 }nr|jdkr�|}nb|jdk�r>d|jd d j }|�d�}|d|jd d j 7 }|d|jd d j 7 }||7 }t|t ��rT|�d�}t
� |�� � | _ | j S )aZ
Creates a fingerprint that can be compared with a public key to see if
the two form a pair.
This fingerprint is not compatiable with fingerprints generated by any
other software.
:return:
A byte string that is a sha256 hash of selected components (based
on the key type)
Nr� rf r? r� z%d:%dr6 r7 r� z %d:%d:%d:%dr; r< r= r� r> r} z%s:zutf-8r~ r| rp � :rq rl rm )
� _fingerprintr� r� rO r> r� r� �encoder� r �hashlib�sha256�digest)rS r� r� �to_hashr> r. r. r/ � fingerprint9 sD
zPrivateKeyInfo.fingerprint) r) r* r+ r, r r� r r� r- r� �_spec_callbacksr� r� r� r� rV r� r� r �propertyrq r� r� r� r� r> r� r� r. r. r. r/ r� � s, DI " r� c @ s e Zd ZdZdefdefgZdS )�EncryptedPrivateKeyInfoz<
Source: https://tools.ietf.org/html/rfc5208#page-4
Zencryption_algorithmZencrypted_dataN)r) r* r+ r, r r r- r. r. r. r/ r� v s r� c @ s e Zd ZdZdefdefgZdS )�ValidationParmsz=
Source: https://tools.ietf.org/html/rfc3279#page-10
rn Z pgen_counterN)r) r* r+ r, r r r- r. r. r. r/ r� � s r� c @ s> e Zd ZdZdefdefdefdeddifdeddifgZd S )
�DomainParametersz=
Source: https://tools.ietf.org/html/rfc3279#page-10
r; r= r< �jr8 TZvalidation_paramsN)r) r* r+ r, r r� r- r. r. r. r/ r� � s r� c @ s e Zd ZdZddddd�ZdS )�PublicKeyAlgorithmIdzM
Original Name: None
Source: https://tools.ietf.org/html/rfc3279
r� r� r� �dh)z1.2.840.113549.1.1.1z1.2.840.10040.4.1z1.2.840.10045.2.1z1.2.840.10046.2.1N)r) r* r+ r, r3 r. r. r. r/ r� � s
r� c @ s6 e Zd ZdZdefdeddifgZdZee e
d�Z dS ) �PublicKeyAlgorithmzd
Original Name: AlgorithmIdentifier
Source: https://tools.ietf.org/html/rfc5280#page-18
r� rf r8 T)r� rf )r� r� r� N) r) r* r+ r, r� r r- rg r� r{ r� rh r. r. r. r/ r� � s r� c @ s� e Zd ZdZdefdefgZdd� ZdeiZdZ dZ
dZ dZ dZ
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Original Name: SubjectPublicKeyInfo
Source: https://tools.ietf.org/html/rfc5280#page-17
r� r> c C s$ | d d j }tttd ftd�| S )Nr� )r� r� r� r� )rO r9 r rX )rS r� r. r. r/ �_public_key_spec� s z PublicKeyInfo._public_key_specNc C s� t |t�s&t |t�s&ttdt|����|dkr@ttdt|����t� }t |�|d< t
� |d< | � }||d< t |t�r�|� � � � }t
|�|d< |S )a
Wraps a public key in a PublicKeyInfo structure
:param public_key:
A byte string or Asn1Value object of the public key
:param algorithm:
A unicode string of "rsa"
:return:
A PublicKeyInfo object
zW
public_key must be a byte string or Asn1Value, not %s
r� z>
algorithm must "rsa", not %s
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zPublicKeyInfo.wrapc C sB | j dkr| d jS | j �� }|dkr*dnd}ttd||���dS )z�
Unwraps an RSA public key into an RSAPublicKey object. Does not support
DSA or EC public keys since they do not have an unwrapped form.
:return:
An RSAPublicKey object
r� r> ZECZanrl zj
Only RSA public keys may be unwrapped - this key is %s %s public
key
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zPublicKeyInfo.unwrapc C sP | j dkr ttd| j �� ���| d d }|j}|jdkr@d}n|j}|j|fS )a#
Returns information about the curve used for an EC key
:raises:
ValueError - when the key is not an EC key
:return:
A two-element tuple, with the first element being a unicode string
of "implicit_ca", "specified" or "named". If the first element is
"implicit_ca", the second is None. If "specified", the second is
an OrderedDict that is the native version of SpecifiedECDomain. If
"named", the second is a unicode string of the curve name.
r� zK
Only EC keys have a curve, this key is %s
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zPublicKeyInfo.curvec C s^ | j dkr ttd| j �� ���| d d }|jdkr8dS t�|d jd�d }|d krZd
S d S ) a#
Returns the name of the family of hash algorithms used to generate a
DSA key
:raises:
ValueError - when the key is not a DSA key
:return:
A unicode string of "sha1" or "sha2" or None if no parameters are
present
r� zt
Only DSA keys are generated using a hash algorithm, this key is
%s
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zPublicKeyInfo.hash_algoc C s | j dkr| d d j| _ | j S )zO
:return:
A unicode string of "rsa", "dsa" or "ec"
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zPublicKeyInfo.algorithmc C s� | j dkr�| jdkr2t| d j�d d d | _ nt| jdkrN| d jd j}n | jd krj| d
d d j}tt�t�|d���| _ | j d }|d
kr�| j d| 7 _ | j S )zT
:return:
The bit size of the public key, as an integer
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zPublicKeyInfo.bit_sizec C s t t�| jd ��S )zU
:return:
The byte size of the public key, as an integer
r� )rD rE rF r� )rS r. r. r/ r� � s zPublicKeyInfo.byte_sizec C s( | j dkr"t�t| d ���� | _ | j S )ze
:return:
The SHA1 hash of the DER-encoded bytes of this public key info
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zPublicKeyInfo.sha1c C s( | j dkr"t�t| d ���� | _ | j S )zh
:return:
The SHA-256 hash of the DER-encoded bytes of this public key info
Nr> )�_sha256r� r� r r� )rS r. r. r/ r� � s
zPublicKeyInfo.sha256c C sj | j dk�rd| d d j}| d d }|dkrR| d j}d|d j|d jf }n�|d kr�| d j}d
|d j|d j|d
j|jf }n�|dk�r>| d }|jdkr�d|jj }|�d�}||j7 }nv|jdkr�|j}nd|jdk�r>d|jd d j }|�d�}|d|jd d j 7 }|d|jd d j 7 }||j7 }t|t��rT|�d�}t� |��
� | _ | j S )a[
Creates a fingerprint that can be compared with a private key to see if
the two form a pair.
This fingerprint is not compatiable with fingerprints generated by any
other software.
:return:
A byte string that is a sha256 hash of selected components (based
on the key type)
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7
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