File: //usr/lib64/python3.6/site-packages/M2Crypto/__pycache__/DSA.cpython-36.opt-1.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
N)�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�S )zV
Return the key length.
:return: the DSA key length in bits
)r Z
dsa_keylenr )r r r r �__len__A s z DSA.__len__c C s* |dkr"t td|f �}|| j�S t�dS ) z�
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")
�p�q�g�pub�privz
dsa_get_%sN)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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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� dS )z&
Generate a key pair.
N)r Z dsa_gen_keyr )r r r r �gen_keyx s z DSA.gen_keyc
C s. t j|d��}tj| j|j� �}W dQ R X |S )z�
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- r. 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- r2 r3 Zciphr r r r1 � 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- r. 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
)r Zdsa_write_pub_key_bior r+ )r r- r r r r5 � s zDSA.save_pub_key_bioc C s t j| j|�S )a
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".
)r Zdsa_signr )r �digestr r r �sign� s zDSA.signc C s t j| j|||�S )a�
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
)r Z
dsa_verifyr )r r7 �r�sr r r �verify� s
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DSA.verifyc C s t j| j|�S )N)r Z
dsa_sign_asn1r )r r7 r r r � sign_asn1� s z
DSA.sign_asn1c C s t j| j||�S )N)r Zdsa_verify_asn1r )r r7 Zblobr r r � verify_asn1� s zDSA.verify_asn1c C s 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
)r Z
dsa_check_keyr )r r r r � check_key� s z
DSA.check_keyN)r )r r r
�__doc__r Zdsa_freer r r r r! r$ r& r' r/ r0 r �passphrase_callbackr4 r1 r6 r5 r8 r; r< r= r> r r r r r s,
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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?
)r Zdsa_check_pub_keyr )r r r r r> s zDSA_pub.check_keyN) r r r
r? r8 r< r> r r6 r4 r5 r1 r r r r rA s rA 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 )�bitsr3 r r r r �
gen_params" s
rE c C s" t j� }t j|| ||� t|d�S )z�
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.
rC )r �dsa_newr% r )r r r r r r r r& 3 s r& c
C s$ t j| ��}t||�}W dQ R X |S )a�
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)�filer3 r- r. r r r � load_paramsC s
rI 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.
rC )r Zdsa_read_paramsr+ r )r- r3 r r r r rG V s
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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)rH r3 r- r. r r r �load_keyg s
rK 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.
rC )r Z dsa_read_keyr+ r )r- r3 r r r r rJ z s
rJ 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.
rC )r rF r% Z dsa_set_pubrA )r r r r r r r r �pub_key_from_params� s rL 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)rH r3 r- r. r r r � load_pub_key� s rN 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.
rC )r Zdsa_read_pub_keyr+ rA )r- r3 Zdsapubr r r rM � s rM N) Z
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