Checksums for official iOS builds (SHA1)

Apple sure doesn't make it very easy if you're one of the iOS users that prefers to roll back to a prior release on your iPod Touch, iPhone or iPad. Even if you were able to save the SHSH blob for your device in combination with a certain build in Cydia or by using TinyUmbrella, you would still need to get the binary firmware bits from Apple. Just in case you happened to have gotten a build from a different source, here's where you can get SHA1's for the official releases. Simply run this command on the file (in OS X) and compare it to this list:

/usr/bin/openssl sha1 /Users/test/Downloads/iPhone2,1_4.1_8B117_Restore.ipsw