# Functions
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NewBackupFile allows reading decrypted backup frames from encrypted data in an io.Reader.
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# Constants
BlobPieceSize is a specific size used by Signal for Android, and if you don't match it, your mac will be messed up.
DigestIterations is how many times to perform a SHA512 digest on a user's password.
MACSize is the length every MAC is truncated down to.
# Variables
HKDFInfo is used to build an HKDF from which the cipher key and MAC key can be extracted - must be the same as Signal for Android.
# Structs
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