# and OpenSSL version before 1.1.0 you also need -A (uppercase).
Openssl tool decrypt key iv how to#
# If your input is more than 76 chars per line (as your Q showed) IT IS THE KEY And now how to correctly encrypt data with php opensslencrypt and how to correctly decrypt it from openssl command line tool. Use opensslencrypt() function first to generate cipher data before using this to decrypt. Id like to know key+IV equivalent of that MYPASSWORD. While its man page seems daunting at first, its use is rather simple. Openssl should derive key+IV from passphrase.
By mixing in an IV, you mitigate any patterns from forming which could be identified and used to break your encryption key. If you need a quick way to encrypt and decrypt a file, you can use the openssl tool of the OpenSSL library. # add -nopad and handle the last few bytes manually as needed. Without a random seed, a pattern can developed in your cipher data if only your encryption key is used. # For a block mode like CBC if standard PKCS5/7 padding wasn't used Remember to use -K with the hex key and -iv with the hex IV. # you can use -a as a synonym for -base64 Then it seems it doesnt realize that you are specifying the raw keys.
Openssl tool decrypt key iv password#
There are four steps involved when decrypting: 1) Decoding the input (from Base64), 2) extracting the Salt, 3) creating the key (key-stretching) using the password and the Salt. Unlike the command line, each step must be explicitly performed with the API. OpenSSL adds a specific header (that's the 'magic number' it is complaining about) and some randomness (a 'salt' - salts make a lot of sense when keys are passwords, but that's not the. To decrypt the output of an AES encryption (aes-256-cbc) we will use the OpenSSL C++ API. # note that's -K uppercase not -k lowercase When doing symmetric encryption, openssl enc, the command-line tool, uses its own non-standard, OpenSSL-specific format which does not match what SOAP uses. Since you have the key, NOT a password, and the IV, convert them both to hex (not base64) and use: openssl enc -base64 -d -rc2 -K $key_in_hex -iv $iv_in_hex The OpenSSL PBKDF (like other better ones) uses a random 'salt' which must be stored in an OpenSSL-specific format at the beginning of the ciphertext, and the lack of that salt is causing your error message bad magic number. Openssl enc by default does password-based encryption and decryption, which means the actual key and IV (except for ECB, which has no IV) used for the cipher are derived by a hashing process called Password-Based Key Derivation Function (PBKDF) - and a nonstandard one to boot any argument you give as -iv is ignored - which is good because the argument you gave is invalid anyway, see below. OpenSSL commandline (and for the most part the EVP API as well) defaults to CBC mode and 'PKCS5' (technically PKCS7) padding, which may or may not be correct.
openssl enc -nosalt -aes-128-cbc -in test -out test. That key and iv can be substituted in the Java program above. Knowing the algorithm RC2 isn't enough you also need to match the mode of operation and for some modes padding scheme. If openssl is executed in the following way, it will use a password, and print the key and iv used.
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