Decryption wrong when seeking into a file.

[Lorenzo]

I have a quick question to ask. I'm using the EVP_EncryptInit and EVP_DecryptInit functions to stream data to a file. Basically, I encrypt data , one byte at a time, which is in the put area of my filebuf object and send it out. I When I get data from the file, I decrypt each byte I receive one byte at a time. The problem is when i use 'seekg(x)' to seek to a point in the file , when I try to decrypt the buffer I get back, the results are wrong. However, when I start from the beginning, every thing is fine. When I seek, it does seek to the right byte in the file. Does any one know why this may be the case?   I'm using EVP_rc4();