How to use fail_with_msg method in pandera

Best Python code snippet using pandera_python

pyaescrypt.py

Source:pyaescrypt.py

...23    with open(path, "rb") as fIn:24        fdata = fIn.read(3)25        # check if file is in AES Crypt format (also min length check)26        if fdata != bytes("AES", "utf8") or os.stat(path).st_size < 136:27            fail_with_msg("Error: file is corrupted or " +28                "not an AES Crypt (or pyAesCrypt) file.")29        # check if file is in AES Crypt format, version 230        # (the only one compatible with pyAesCrypt)31        fdata = fIn.read(1)32        if len(fdata) < 1:33            fail_with_msg("Error: file is corrupted.")34        if fdata != b"\x02":35            fail_with_msg("Error: pyAesCrypt is only compatible with version 2 of the " +36                "AES Crypt file format.")37        # skip reserved byte38        fIn.read(1)39        # skip all the extensions40        while True:41            fdata = fIn.read(2)42            if len(fdata) < 2:43                fail_with_msg("Error: file is corrupted.")44            if fdata == b"\x00\x00":45                break46            fIn.read(int.from_bytes(fdata, byteorder="big"))47        # read external iv48        iv1 = fIn.read(16)49        if len(iv1) < 16:50            fail_with_msg("Error: file is corrupted.")51        # stretch password and iv52        key=pyAesCryptStretch(passw, iv1)53        # read encrypted main iv and key54        c_iv_key = fIn.read(48)55        if len(c_iv_key) < 48:56            fail_with_msg("Error: file is corrupted.")57        # read HMAC-SHA256 of the encrypted iv and key58        hmac1 = fIn.read(32)59        if len(hmac1) < 32:60            fail_with_msg("Error: file is corrupted.")61        # compute actual HMAC-SHA256 of the encrypted iv and key62        hmac1Act = HMAC.new(key, digestmod=SHA256)63        hmac1Act.update(c_iv_key)64        # HMAC check65        if hmac1 != hmac1Act.digest():66            fail_with_msg("Error: wrong password (or file is corrupted).")67        # instantiate AES cipher68        cipher1 = AES.new(key, AES.MODE_CBC, iv1)69        # decrypt main iv and key70        iv_key = cipher1.decrypt(c_iv_key)71        # get internal iv and key72        iv0 = iv_key[:16]73        intKey = iv_key[16:]74        # instantiate another AES cipher75        cipher0 = AES.new(intKey, AES.MODE_CBC, iv0)76        # instantiate actual HMAC-SHA256 of the ciphertext77        hmac0Act = HMAC.new(intKey, digestmod=SHA256)78        # decrypt ciphertext in large pieces first, then smaller pieces79        sizeInputFile = os.stat(path).st_size80        for currentBufferSize in [64*64*AES.block_size, 64*AES.block_size, AES.block_size]:81            assert 0 == currentBufferSize % AES.block_size82            while fIn.tell() < sizeInputFile - 32 - 1 - currentBufferSize:83                # read data84                cText = fIn.read(currentBufferSize)85                # update HMAC86                hmac0Act.update(cText)87                # decrypt data88                if fncallback:89                    fncallback(cipher0.decrypt(cText))90                else:91                    outbytes += bytearray(cipher0.decrypt(cText))92        # last block reached, remove padding if needed93        # read last block94        if fIn.tell() != os.stat(path).st_size - 32 - 1:  # this is for empty files95            cText = fIn.read(AES.block_size)96            if len(cText) < AES.block_size:97                fail_with_msg("Error: file is corrupted.")98        else:99            cText = bytes()100        # update HMAC101        hmac0Act.update(cText)102        # read plaintext file size mod 16 lsb positions103        fs16 = fIn.read(1)104        if len(fs16) < 1:105            fail_with_msg("Error: file is corrupted.")106        # decrypt last block107        pText = cipher0.decrypt(cText)108        # remove padding109        toremove=((16-fs16[0])%16)110        if toremove != 0:111            pText=pText[:-toremove]112        if fncallback:113            fncallback(pText)114        else:115            outbytes += bytearray(pText)116        # read HMAC-SHA256 of the encrypted file117        hmac0 = fIn.read(32)118        if len(hmac0) < 32:119            fail_with_msg("Error: file is corrupted.")120        # HMAC check121        if hmac0 != hmac0Act.digest():122            fail_with_msg("Error: bad HMAC (file is corrupted).")123    return outbytes124def pyAesCryptStretch(passw, iv1):125    # hash the external iv and the password 8192 times126    from Crypto.Hash import SHA256127    digest=iv1+(16*b"\x00")128    for _ in range(8192):129        passHash=SHA256.new()130        passHash.update(digest)131        passHash.update(bytes(passw,"utf_16_le"))132        digest=passHash.digest()133    return digest134def fail_with_msg(s):135    print(s)...

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