Since the decryption was done in place, if an incorrect key was given, the encrypted data would be corrupted. Fixes golang/go#8439. R=bradfitz CC=golang-codereviews https://golang.org/cl/115550043
Since the decryption was done in place, if an incorrect key was given, the encrypted data would be corrupted. Fixes golang/go#8439. R=bradfitz CC=golang-codereviews https://golang.org/cl/115550043