Hello, Windows program does not know length of data. I would like to use some kind of standard method and use exact method on Windows to decrypt.
I think my problem is really that I do not know what "padding" is used by default. I have found below function. However, there is no detailed explanation about it in here: https://www.openssl.org/docs/man1.0.2/crypto/EVP_CIPHER_CTX_set_padding.html int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *x, int padding); I wanted to learn what values can "padding" parameter be. I understand I can set it to zero ( 0 ) for disabling padding. This is not what I want because my plain text length is not confirmed to be multiply of 16 bytes. I can use PKCS#7 to decrypt on Windows so I would like to encrypt using that padding. Just do not know what value to pass in above function now. Thanks & regards, Ertan Küçükoğlu Michael Wojcik <michael.woj...@microfocus.com>, 28 Ara 2018 Cum, 21:16 tarihinde şunu yazdı: > > From: openssl-users [mailto:openssl-users-boun...@openssl.org] On > Behalf Of Ertan Küçükoglu > > Sent: Thursday, December 27, 2018 16:03 > > > A- I tried to directly decrypt (no padding applied) and I get my plain > text plus > > some additional invisible characters at the end. I am told it maybe a > "padding" > > issue, my problem, during decryption. > > How does the Windows program know how long the decrypted data is? > > It sounds to me like the problem is simply that your Windows code is > decrypting the data correctly, then reading past it into garbage left at > the end of the buffer. > > If the messages are of fixed length, only use that many bytes from the > decryption output. If they're of variable length, then the sender will have > to tell the receiver how long they are. There are many ways of doing that; > you haven't told us enough about your protocol to know which would be > appropriate in your case. > > -- > Michael Wojcik > Distinguished Engineer, Micro Focus > > > -- > openssl-users mailing list > To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users >
-- openssl-users mailing list To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
