CODEWITHSUNDEEP
cunixencryptionopensslcryptography
Vandan
Vandan

Reputation: 1

AES_cfb128_encrypt and decrypt using openssl command

I am encrypting a data file using below openssl function

KEY="123456KEY";
IVEC="123456IVEC"

AES_set_encrypt_key(KEY, 128, &key);
AES_cfb128_encrypt(indata, outdata, bytes_read, &key, IVEC, &num, AES_ENCRYPT);

As a result I have encrypted file file.tgz.enc, I can decrypt this file using same AES_cfb128_encrypt(AES_DECRYPT) function, but I want to decrypt this file using command line openssl command. I am trying like

======
COMMAND
======
/usr/bin/openssl enc -aes-128-cbc -d -in file.tgz.enc -out
new-file.tgz -K 123456KEY -iv 123456IVEC
======
OUTPUT
======
non-hex digit
invalid hex iv value

I am getting error on command line, like non-hex digit, invalid hex iv value and I am unable to decrypt the file. any idea ? Can some one guide me ?

Upvotes: 0

Views: 1574

Answers (1)

Pras
Pras

Reputation: 4044

-K and -iv expects hex character and the input you specified has non hex characters K and Y in 123456KEY and I and V in 123456IVEC

You need pass proper 16 byte key to AES_cfb128_encrypt and initialization vector to AES_cfb128_encrypt But KEY has only 9 bytes, if size of KEY(variable) is 9 too, it is likely to result into undefined behavior as AES_set_encrypt_key will go on reading 128 bites(16 bytes) from KEY

Whichever key and IV you use in your code, you need to take its hex representation and use it in openssl command tool

Upvotes: 1

Related Questions