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If it's a small number of passwords then you could use an online tool to enter the password then cut-n-paste the result into your .CSV file. For this you could try
MD5Encryption.comAnother method would be to write a quick PHP script that reads in the .csv and encrypts the password field and then does the MySQL insert into the database for you.
Or third, you could write a quick PHP script to read the .csv file, MD5() encrypt the password field and then resave the .csv file. Then you could import it - but this seems like the long way around