File: //proc/thread-self/root/lib64/python3.6/site-packages/M2Crypto/__pycache__/DSA.cpython-36.pyc
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This class is a context supporting DSA key and parameter
values, signing and verifying.
Simple example::
from M2Crypto import EVP, DSA, util
message = 'Kilroy was here!'
md = EVP.MessageDigest('sha1')
md.update(message)
digest = md.final()
dsa = DSA.gen_params(1024)
dsa.gen_key()
r, s = dsa.sign(digest)
good = dsa.verify(digest, r, s)
if good:
print(' ** success **')
else:
print(' ** verification failed **')
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Use one of the factory functions to create an instance.
:param dsa: binary representation of OpenSSL DSA type
z'dsa' type errorN)r �dsa_type_check�AssertionError�dsa�_pyfree)�selfr r r r r �__init__2 s z DSA.__init__c C s t | dd�r| j| j� d S )Nr r )�getattr� m2_dsa_freer )r r r r �__del__< s z DSA.__del__c C s t j| j�std��t j| j�S )zV
Return the key length.
:return: the DSA key length in bits
z'dsa' type error)r r r r Z
dsa_keylen)r r r r �__len__A s z DSA.__len__c C s> |d kr6t td|f �}tj| j�s,td��|| j�S t�dS )
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Return specified DSA parameters and key values.
:param name: name of variable to be returned. Must be
one of 'p', 'q', 'g', 'pub', 'priv'.
:return: value of specified variable (a "byte string")
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dsa_get_%sz'dsa' type errorN)r r r r r )r r r r r �AttributeError)r �name�methodr r r � __getattr__K s
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Nr r r z set (p, q, g) via set_params()r r z"generate (pub, priv) via gen_key())r r r )r r )r
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zDSA.__setattr__c C s t j| j|||� dS )a�
Set new parameters.
:param p: MPI binary representation ... format that consists of
the number's length in bytes represented as a 4-byte
big-endian number, and the number itself in big-endian
format, where the most significant bit signals
a negative number (the representation of numbers with
the MSB set is prefixed with null byte).
:param q: ditto
:param g: ditto
@warning: This does not change the private key, so it may be
unsafe to use this method. It is better to use
gen_params function to create a new DSA object.
N)r � dsa_set_pqgr )r r r r r r r �
set_paramsd s zDSA.set_paramsc C s$ t j| j�std��t j| j� dS )z&
Generate a key pair.
z'dsa' type errorN)r r r r Z dsa_gen_key)r r r r �gen_keyx s z DSA.gen_keyc
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Save the DSA parameters to a file.
:param filename: Save the DSA parameters to this file.
:return: 1 (true) if successful
�wbN)r �openfiler �dsa_write_params_bior �_ptr)r �filename�bio�retr r r � save_params� s zDSA.save_paramsc C s t j| j|j� �S )z�
Save DSA parameters to a BIO object.
:param bio: Save DSA parameters to this object.
:return: 1 (true) if successful
)r r, r r- )r r/ r r r �save_params_bio� s zDSA.save_params_bioZ aes_128_cbcc C s* t j|d��}| j|||�}W dQ R X |S )a
Save the DSA key pair to a file.
:param filename: Save the DSA key pair to this file.
:param cipher: name of symmetric key algorithm and mode
to encrypt the private key.
:return: 1 (true) if successful
r* N)r r+ � save_key_bio)r r. �cipher�callbackr/ r0 r r r �save_key� s z DSA.save_keyc C s^ |dkr t j| j|j� |�S tt |d�}|dkr>td| ��n|� }t j| j|j� ||�S dS )a
Save DSA key pair to a BIO object.
:param bio: Save DSA parameters to this object.
:param cipher: name of symmetric key algorithm and mode
to encrypt the private key.
:return: 1 (true) if successful
Nzno such cipher: %s)r Zdsa_write_key_bio_no_cipherr r- r r
Zdsa_write_key_bio)r r/ r4 r5 Zciphr r r r3 � s zDSA.save_key_bioc C s& t j|d��}| j|�}W dQ R X |S )z�
Save the DSA public key (with parameters) to a file.
:param filename: Save DSA public key (with parameters)
to this file.
:return: 1 (true) if successful
r* N)r r+ �save_pub_key_bio)r r. r/ r0 r r r � save_pub_key� s zDSA.save_pub_keyc C s t j| j|j� �S )z�
Save DSA public key (with parameters) to a BIO object.
:param bio: Save DSA public key (with parameters)
to this object.
:return: 1 (true) if successful
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Sign the digest.
:param digest: SHA-1 hash of message (same as output
from MessageDigest, a "byte string")
:return: DSA signature, a tuple of two values, r and s,
both "byte strings".
zkey is not initialised)� check_keyr r Zdsa_signr )r �digestr r r �sign� s
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Verify a newly calculated digest against the signature
values r and s.
:param digest: SHA-1 hash of message (same as output
from MessageDigest, a "byte string")
:param r: r value of the signature, a "byte string"
:param s: s value of the signature, a "byte string"
:return: 1 (true) if verify succeeded, 0 if failed
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dsa_verifyr )r r: �r�sr r r �verify� s z
DSA.verifyc C s | j � std��tj| j|�S )Nzkey is not initialised)r9 r r Z
dsa_sign_asn1r )r r: r r r � sign_asn1� s z
DSA.sign_asn1c C s | j � std��tj| j||�S )Nzkey is not initialised)r9 r r Zdsa_verify_asn1r )r r: Zblobr r r � verify_asn1� s zDSA.verify_asn1c C s t j| j�std��t j| j�S )z}
Check to be sure the DSA object has a valid private key.
:return: 1 (true) if a valid private key
z'dsa' type error)r r r r Z
dsa_check_key)r r r r r9 � s z
DSA.check_keyN)r )r r r
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This class is a DSA context that only supports a public key
and verification. It does NOT support a private key or
signing.
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:return: does DSA_pub contain a pub key?
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rA r; r? r9 r r8 r6 r7 r3 r r r r rC s rC c C s t j| |�}t|d�S )a�
Factory function that generates DSA parameters and
instantiates a DSA object from the output.
:param bits: The length of the prime to be generated. If
'bits' < 512, it is set to 512.
:param callback: A Python callback object that will be
invoked during parameter generation; it usual
purpose is to provide visual feedback.
:return: instance of DSA.
� )r Zdsa_generate_parametersr )�bitsr5 r r r r �
gen_params" s
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Factory function that instantiates a DSA object with DSA
parameters.
:param p: value of p, a "byte string"
:param q: value of q, a "byte string"
:param g: value of g, a "byte string"
:return: instance of DSA.
rE )r �dsa_newr' r )r r r r r r r r( 3 s r( c
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Factory function that instantiates a DSA object with DSA
parameters from a file.
:param file: Names the file (a path) that contains the PEM
representation of the DSA parameters.
:param callback: A Python callback object that will be
invoked if the DSA parameters file is
passphrase-protected.
:return: instance of DSA.
N)r r+ �load_params_bio)�filer5 r/ r0 r r r � load_paramsC s
rK c C s t j| j� |�}t|d�S )a�
Factory function that instantiates a DSA object with DSA
parameters from a M2Crypto.BIO object.
:param bio: Contains the PEM representation of the DSA
parameters.
:param callback: A Python callback object that will be
invoked if the DSA parameters file is
passphrase-protected.
:return: instance of DSA.
rE )r Zdsa_read_paramsr- r )r/ r5 r r r r rI V s
rI c
C s$ t j| ��}t||�}W dQ R X |S )a�
Factory function that instantiates a DSA object from a
PEM encoded DSA key pair.
:param file: Names the file (a path) that contains the PEM
representation of the DSA key pair.
:param callback: A Python callback object that will be
invoked if the DSA key pair is
passphrase-protected.
:return: instance of DSA.
N)r r+ � load_key_bio)rJ r5 r/ r0 r r r �load_keyg s
rM c C s t j| j� |�}t|d�S )a~
Factory function that instantiates a DSA object from a
PEM encoded DSA key pair.
:param bio: Contains the PEM representation of the DSA
key pair.
:param callback: A Python callback object that will be
invoked if the DSA key pair is
passphrase-protected.
:return: instance of DSA.
rE )r Z dsa_read_keyr- r )r/ r5 r r r r rL z s
rL c C s. t j� }t j|| ||� t j||� t|d�S )a
Factory function that instantiates a DSA_pub object using
the parameters and public key specified.
:param p: value of p
:param q: value of q
:param g: value of g
:param pub: value of the public key
:return: instance of DSA_pub.
rE )r rH r' Z dsa_set_pubrC )r r r r r r r r �pub_key_from_params� s rN c
C s$ t j| ��}t||�}W dQ R X |S )a
Factory function that instantiates a DSA_pub object using
a DSA public key contained in PEM file. The PEM file
must contain the parameters in addition to the public key.
:param file: Names the file (a path) that contains the PEM
representation of the DSA public key.
:param callback: A Python callback object that will be
invoked should the DSA public key be
passphrase-protected.
:return: instance of DSA_pub.
N)r r+ �load_pub_key_bio)rJ r5 r/ r0 r r r � load_pub_key� s rP c C s t j| j� |�}t|d�S )a�
Factory function that instantiates a DSA_pub object using
a DSA public key contained in PEM format. The PEM
must contain the parameters in addition to the public key.
:param bio: Contains the PEM representation of the DSA
public key (with params).
:param callback: A Python callback object that will be
invoked should the DSA public key be
passphrase-protected.
:return: instance of DSA_pub.
rE )r Zdsa_read_pub_keyr- rC )r/ r5 Zdsapubr r r rO � s rO N) Z
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