From 602fcf7050d84d4840aa1a37034a08e927a8949a Mon Sep 17 00:00:00 2001 From: Dimitri Sokolyuk Date: Mon, 1 May 2017 15:38:30 +0200 Subject: Add sum --- zsig/sum.go | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 zsig/sum.go (limited to 'zsig/sum.go') diff --git a/zsig/sum.go b/zsig/sum.go new file mode 100644 index 0000000..8e5b23f --- /dev/null +++ b/zsig/sum.go @@ -0,0 +1,24 @@ +package zsig + +import ( + "crypto/sha512" + "io" +) + +// Sum calculates SHA512/256 +func Sum(r io.Reader) chan []byte { + c := make(chan []byte) + go func() { + defer close(c) + buf := make([]byte, BlockSz) + for { + n, err := io.ReadFull(r, buf) + if err == io.EOF { + return + } + sum := sha512.Sum512_256(buf[:n]) + c <- sum[:] + } + }() + return c +} -- cgit v1.2.3