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-rw-r--r--lib/blocks.go32
1 files changed, 32 insertions, 0 deletions
diff --git a/lib/blocks.go b/lib/blocks.go
new file mode 100644
index 0000000..3805d86
--- /dev/null
+++ b/lib/blocks.go
@@ -0,0 +1,32 @@
+// Copyright © 2020 rsiddharth <s@ricketyspace.net>
+// SPDX-License-Identifier: ISC
+
+package lib
+
+// Breaks 'cb' into blocks of 'keysize'
+func BreakIntoBlocks(cb []byte, keysize int) [][]byte {
+ if len(cb) < 1 {
+ return make([][]byte, 0)
+ }
+
+ // Compute the number of blocks.
+ nb := len(cb) / keysize
+ if len(cb)%keysize != 0 {
+ nb += 1
+ }
+ blocks := make([][]byte, nb)
+
+ for i, j, k := 0, 0, 0; i < len(cb); i++ {
+ if len(blocks[k]) == 0 {
+ blocks[k] = make([]byte, keysize)
+ }
+ blocks[k][j] = cb[i]
+
+ j += 1
+ if j == 8 {
+ j = 0
+ k += 1
+ }
+ }
+ return blocks
+}