Thanks for the answers, you helped me lot! Thank you. CyPher
On Fri, 21 Apr 2006 21:06:04 +0200, "Marek Marcola" <[EMAIL PROTECTED]> said: > Hello, > > > i want to encrypt and decrypt strings, now i'm using the ecb > encryption > > of openssl/aes.h > > and it looks the encrypted block length depends on the key, or the > > encrypted msg has an \0 in. > In AES encryption/decryption block size is always 16 bytes and not > depends on key size. > Key size for AES256 is 32 bytes, for AES192 24 bytes and for AES128 16 > bytes. > If you want to use AES in ecb mode You can use AES_ecb_encrypt() > (witch simply use AES_encrypt()/AES_decrypt()). > First parameter of this function (in) have to be pointer to 16 bytes of > data to decrypt/encrypt, second parameter is pointer to > encrypted/decrypted > result of 16 bytes length. > > > i have to know the length of the block to base64 encode it. > Always 16 bytes. > > > So if i encrypt my "utopia" test string > You encrypt "utopia" + 10 random bytes at end of buffer - if You use > AES_ecb_encrypt(). > For proper encryption you should use padding in this situation. > > > with unsigned char > > key[32]="bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"; > > strlen(encryptedmsg) returns 11 while if i use 32byte of "a" unsigned > > char strlen(encryptedmsg); returns 16. > You can not check length of encrypted data with strlen(). > For AES block size is 16 bytes. > > > Does really depends the blocksize on password, > No, not depends, > > > or strlen is not a good way to know the blocksize? > Is not good way for this. > > Of course all this is true if you use AES_ecb_encrypt(). > It is only my guess. > > Best regards, > -- > Marek Marcola <[EMAIL PROTECTED]> > > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List openssl-users@openssl.org > Automated List Manager [EMAIL PROTECTED] -- cy pher [EMAIL PROTECTED] -- http://www.fastmail.fm - The professional email service ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager [EMAIL PROTECTED]
