oscrypto/_win/asymmetric.py
def _advapi32_interpret_dsa_key_blob(bit_size, public_blob, private_blob):
    """
    Takes a CryptoAPI DSS private key blob and converts it into the ASN.1
    structures for the public and private keys

    :param bit_size:
        The integer bit size of the key

    :param public_blob:
        A byte string of the binary data after the public key header

    :param private_blob:
        A byte string of the binary data after the private key header

    :return:
        A 2-element tuple of (asn1crypto.keys.PublicKeyInfo,
        asn1crypto.keys.PrivateKeyInfo)
    """

    len1 = 20
    len2 = bit_size // 8

    q_offset = len2
    g_offset = q_offset + len1
    x_offset = g_offset + len2
    y_offset = x_offset

    p = int_from_bytes(private_blob[0:q_offset][::-1])
    q = int_from_bytes(private_blob[q_offset:g_offset][::-1])
    g = int_from_bytes(private_blob[g_offset:x_offset][::-1])
    x = int_from_bytes(private_blob[x_offset:x_offset + len1][::-1])
    y = int_from_bytes(public_blob[y_offset:y_offset + len2][::-1])

    public_key_info = keys.PublicKeyInfo({
        'algorithm': keys.PublicKeyAlgorithm({
            'algorithm': 'dsa',
            'parameters': keys.DSAParams({
                'p': p,
                'q': q,
                'g': g,
            })
        }),
        'public_key': core.Integer(y),
    })

    private_key_info = keys.PrivateKeyInfo({
        'version': 0,
        'private_key_algorithm': keys.PrivateKeyAlgorithm({
            'algorithm': 'dsa',
            'parameters': keys.DSAParams({
                'p': p,
                'q': q,
                'g': g,
            })
        }),
        'private_key': core.Integer(x),
    })

    return (public_key_info, private_key_info)
def _advapi32_interpret_dsa_key_blob(bit_size, public_blob, private_blob):
    """
    Takes a CryptoAPI DSS private key blob and converts it into the ASN.1
    structures for the public and private keys

    :param bit_size:
        The integer bit size of the key

    :param public_blob:
        A byte string of the binary data after the public key header

    :param private_blob:
        A byte string of the binary data after the private key header

    :return:
        A 2-element tuple of (asn1crypto.keys.PublicKeyInfo,
        asn1crypto.keys.PrivateKeyInfo)
    """

    len1 = 20
    len2 = bit_size // 8

    q_offset = len2
    g_offset = q_offset + len1
    x_offset = g_offset + len2
    y_offset = x_offset

    p = int_from_bytes(private_blob[0:q_offset][::-1])
    q = int_from_bytes(private_blob[q_offset:g_offset][::-1])
    g = int_from_bytes(private_blob[g_offset:x_offset][::-1])
    x = int_from_bytes(private_blob[x_offset:x_offset + len1][::-1])
    y = int_from_bytes(public_blob[y_offset:y_offset + len2][::-1])

    public_key_info = keys.PublicKeyInfo({
        'algorithm': keys.PublicKeyAlgorithm({
            'algorithm': 'dsa',
            'parameters': keys.DSAParams({
                'p': p,
                'q': q,
                'g': g,
            })
        }),
        'public_key': core.Integer(y),
    })

    private_key_info = keys.PrivateKeyInfo({
        'version': 0,
        'private_key_algorithm': keys.PrivateKeyAlgorithm({
            'algorithm': 'dsa',
            'parameters': keys.DSAParams({
                'p': p,
                'q': q,
                'g': g,
            })
        }),
        'private_key': core.Integer(x),
    })

    return (public_key_info, private_key_info)
def _advapi32_interpret_dsa_key_blob ( bit_size , public_blob , private_blob ) : len1 = 20 len2 = bit_size // 8 q_offset = len2 g_offset = q_offset + len1 x_offset = g_offset + len2 y_offset = x_offset p = int_from_bytes ( private_blob [ 0 : q_offset ] [ : : - 1 ] ) q = int_from_bytes ( private_blob [ q_offset : g_offset ] [ : : - 1 ] ) g = int_from_bytes ( private_blob [ g_offset : x_offset ] [ : : - 1 ] ) x = int_from_bytes ( private_blob [ x_offset : x_offset + len1 ] [ : : - 1 ] ) y = int_from_bytes ( public_blob [ y_offset : y_offset + len2 ] [ : : - 1 ] ) public_key_info = keys . PublicKeyInfo ( { 'algorithm' : keys . PublicKeyAlgorithm ( { 'algorithm' : 'dsa' , 'parameters' : keys . DSAParams ( { 'p' : p , 'q' : q , 'g' : g , } ) } ) , 'public_key' : core . Integer ( y ) , } ) private_key_info = keys . PrivateKeyInfo ( { 'version' : 0 , 'private_key_algorithm' : keys . PrivateKeyAlgorithm ( { 'algorithm' : 'dsa' , 'parameters' : keys . DSAParams ( { 'p' : p , 'q' : q , 'g' : g , } ) } ) , 'private_key' : core . Integer ( x ) , } ) return ( public_key_info , private_key_info )
Takes a CryptoAPI DSS private key blob and converts it into the ASN.1
    structures for the public and private keys

    :param bit_size:
        The integer bit size of the key

    :param public_blob:
        A byte string of the binary data after the public key header

    :param private_blob:
        A byte string of the binary data after the private key header

    :return:
        A 2-element tuple of (asn1crypto.keys.PublicKeyInfo,
        asn1crypto.keys.PrivateKeyInfo)
Takes a CryptoAPI DSS private key blob and converts it into the ASN . 1 structures for the public and private keys