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QUESTION
I'm trying to decrypt a string using SubtleCrypto that was pre-generated.
Instead of getting decrypted text I'm getting the error: Failed to execute 'decrypt' on 'SubtleCrypto': parameter 2 is not of type 'CryptoKey'.
...ANSWER
Answered 2021-May-19 at 20:30The parameters have the wrong types: IV and data must be passed as BufferSource
, the key as CryptoKey
, see SubtleCrypto.decrypt()
. A CryptoKey
is returned by SubtleCrypto.importKey()
, which is used to import the key.
WebCrypto API (as low level API) does not provide support for data conversion, e.g. Base64 encoded data or strings to BufferSource
, so other helper methods must be used for this.
The following code decrypts the ciphertext:
QUESTION
I am computing HASH value of each row in a table (for diffing purpose), after implementing the algorithm I am testing the results. Results are consistent and algorithm somewhat seems to work, but testing it step by step I found a strange result.
The script:
...ANSWER
Answered 2021-May-19 at 10:21SELECT HASHBYTES('SHA1',''), --- you are testing this
HASHBYTES('SHA1',N'') -- ..but for xml returns Nvarchar
QUESTION
I used this link to test decrypting AES CBC.
Here my parameters:
This work. Then I implement with C#. My code:
...ANSWER
Answered 2021-Apr-02 at 05:14You need to initialize the IV to all zeroes because otherwise it starts with a random value:
QUESTION
I'm trying to get SHA256 output for hexadecimal values but only able to give string input. The Python 3 code I use is given below
...ANSWER
Answered 2021-Feb-12 at 10:26Convert the hexadecimal string to bytes using bytes.fromhex()
:
QUESTION
I think it's probably openssl, but I just cannot get the correct parameters.
For example, I can get the correct output by this online tool
https://www.devglan.com/online-tools/aes-encryption-decryption,
The output is correct as I expect, but by commands:
...ANSWER
Answered 2020-Dec-17 at 14:19openssl requires Hex encoding of manual keys and IVs, not ASCII encoding. (ASCII or UTF-8 encoding these, as the online tools seems to be doing, dramatically reduces your keyspace and makes AES insecure.)
"E" is 0x45 and "F" is 0x46, so the equivalent openssl command is:
QUESTION
This code encrypted with sha256
...ANSWER
Answered 2020-Dec-05 at 02:16You must decode hex string first.
After getting corresponding raw value, you can convert it to Base64 string.
QUESTION
I have a problem when performing a decryption in TRIPLEDES that a provider sends me in HEX: EF69FF79BBD7E8E4EF69FF79BBD7E8E4 with the following key "0123456789ABCDEFFEDCBA9876543210", applying the following method:
...ANSWER
Answered 2020-Dec-03 at 18:38The website uses neither a padding nor an IV. Therefore in the code the padding must be disabled and the ECB mode must be applied.
Furthermore the website expects a hex encoded key and ciphertext and returns the decrypted data also hex encoded, which therefore must not be UTF-8 decoded in the code:
QUESTION
ANSWER
Answered 2020-Nov-08 at 09:44The devlan site explains
CBC mode is highly recommended and it requires IV to make each message unique. If no IV is entered then default will be used here for CBC mode and that defaults to a zero based byte[16].
So your prepended IV is considered as a ciphertext block. Now, you have two blocks there. In the CBC mode, the decryption is performed as ( blocks are counted form 1);
QUESTION
I have the next code in PHP:
...ANSWER
Answered 2020-Oct-26 at 08:34In the PHP code AES-128 is specified. Therefore PHP implicitly truncates the 32 bytes key to the first 16 bytes. In the CryptoJS code only this 16 bytes key may be used.
Furthermore, key and IV are converted most easily with the CryptoJS encoders into a WordArray
.
A possible CryptoJS implementation is:
QUESTION
I am trying to implement a python program to encrypt a plain text using AES/ECB/PKCS5 padding. The output I am getting is slightly different from expected.
Python3 program:
...ANSWER
Answered 2020-Oct-05 at 07:39PKCS 5 (or 7) padding is not adding 0 bytes, but adding a c
byteswith value
c(where
1 <= c <= 16) if you're
c` bytes short of a block length multiple.
So if you already have a multiple of 16, add a full 16 bytes of value 16, and if your last block is 'stop' (4 bytes), we add 12 bytes with value 0xc
(12 in hex) to fill up the block. Etc.
This way the receiver (after decryption of the final block) can check the last byte c
and check if the value is 1 <= c <= 16
(if not, reject the decryption) and then check that the last c
bytes indeed are all that same value, and then remove them from the decryption. This way the receiver does not have to guess how many bytes of the last block were only padding or really part of the plain text. It's unambiguous doing it the PKCS way.
I'll leave the coding up to you.
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