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a c�h " � @ sX d dl Zd dl mZmZmZ d dlmZmZmZm Z G dd� d�Z d dd�Z d d � Z dS ) � N)�ceil_div� bytes_to_long� long_to_bytes)� DerSequence�DerNull�DerOctetString� DerObjectIdc @ s0 e Zd ZdZdd� Zdd� Zdd� Zdd � Zd S ) �PKCS115_SigSchemez�A signature object for ``RSASSA-PKCS1-v1_5``. Do not instantiate directly. Use :func:`Crypto.Signature.pkcs1_15.new`. c C s || _ dS )a Initialize this PKCS#1 v1.5 signature scheme object. :Parameters: rsa_key : an RSA key object Creation of signatures is only possible if this is a *private* RSA key. Verification of signatures is always possible. N)�_key)�self�rsa_key� r ��/root/rpmbuild/BUILDROOT/imh-python39-modules-3.9.7-92.el8.x86_64/opt/imh-python/lib/python3.9/site-packages/Crypto/Signature/pkcs1_15.py�__init__) s zPKCS115_SigScheme.__init__c C s | j �� S )z<Return ``True`` if this object can be used to sign messages.)r Z has_private)r r r r �can_sign3 s zPKCS115_SigScheme.can_signc C sH t jj�| jj�}t|d�}t||�}t|�}| j� |�}t ||�}|S )a� Create the PKCS#1 v1.5 signature of a message. This function is also called ``RSASSA-PKCS1-V1_5-SIGN`` and it is specified in `section 8.2.1 of RFC8017 <https://tools.ietf.org/html/rfc8017#page-36>`_. :parameter msg_hash: This is an object from the :mod:`Crypto.Hash` package. It has been used to digest the message to sign. :type msg_hash: hash object :return: the signature encoded as a *byte string*. :raise ValueError: if the RSA key is not long enough for the given hash algorithm. :raise TypeError: if the RSA key has no private half. � ) �Crypto�Util�number�sizer �nr �_EMSA_PKCS1_V1_5_ENCODEr Z_decryptr )r �msg_hash�modBits�kZem�em_intZm_int� signaturer r r �sign7 s zPKCS115_SigScheme.signc C s� t jj�| jj�}t|d�}t|�|kr0td��t |�}| j� |�}t ||�}zPt ||d�g}z|j �d�} W n ty� d} Y n0 | s�|�t ||d�� W n ty� td��Y n0 ||vr�td��dS )ax Check if the PKCS#1 v1.5 signature over a message is valid. This function is also called ``RSASSA-PKCS1-V1_5-VERIFY`` and it is specified in `section 8.2.2 of RFC8037 <https://tools.ietf.org/html/rfc8017#page-37>`_. :parameter msg_hash: The hash that was carried out over the message. This is an object belonging to the :mod:`Crypto.Hash` module. :type parameter: hash object :parameter signature: The signature that needs to be validated. :type signature: byte string :raise ValueError: if the signature is not valid. r zInvalid signatureTz1.2.840.113549.2.FN)r r r r r r r �len� ValueErrorr Z_encryptr r �oid� startswith�AttributeError�append) r r r r r Z signature_intr Zem1Z possible_em1Zalgorithm_is_mdr r r �verifyV s( zPKCS115_SigScheme.verifyN)�__name__� __module__� __qualname__�__doc__r r r r$ r r r r r # s r Tc C s� t t| j��� g�}|r(|�t� �� � t| �� �}t |�� |�� g��� }|t|�d k rlt dt|� ��d|t|� d }d| d | S )a� Implement the ``EMSA-PKCS1-V1_5-ENCODE`` function, as defined in PKCS#1 v2.1 (RFC3447, 9.2). ``_EMSA-PKCS1-V1_5-ENCODE`` actually accepts the message ``M`` as input, and hash it internally. Here, we expect that the message has already been hashed instead. :Parameters: msg_hash : hash object The hash object that holds the digest of the message being signed. emLen : int The length the final encoding must have, in bytes. with_hash_parameters : bool If True (default), include NULL parameters for the hash algorithm in the ``digestAlgorithm`` SEQUENCE. :attention: the early standard (RFC2313) stated that ``DigestInfo`` had to be BER-encoded. This means that old signatures might have length tags in indefinite form, which is not supported in DER. Such encoding cannot be reproduced by this function. :Return: An ``emLen`` byte long string that encodes the hash. � z8Selected hash algorith has a too long digest (%d bytes).� �� s � ) r r r �encoder# r r �digestr � TypeError)r ZemLenZwith_hash_parametersZ digestAlgor. Z digestInfoZPSr r r r � s 2 � r c C s t | �S )a� Create a signature object for creating or verifying PKCS#1 v1.5 signatures. :parameter rsa_key: The RSA key to use for signing or verifying the message. This is a :class:`Crypto.PublicKey.RSA` object. Signing is only possible when ``rsa_key`` is a **private** RSA key. :type rsa_key: RSA object :return: a :class:`PKCS115_SigScheme` signature object )r )r r r r �new� s r0 )T) ZCrypto.Util.numberr r r r ZCrypto.Util.asn1r r r r r r r0 r r r r �<module> s j D
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