From fb7bbef174eee2ad5b5fc5f1bcd13487ba0d0f2e Mon Sep 17 00:00:00 2001
From: siddharth <s@ricketyspace.net>
Date: Tue, 12 Oct 2021 18:26:01 -0400
Subject: lib: move around MDPadding

---
 lib/sha1.go | 84 ++++++++++++++++++++++++++++++-------------------------------
 1 file changed, 42 insertions(+), 42 deletions(-)

(limited to 'lib')

diff --git a/lib/sha1.go b/lib/sha1.go
index 989c59b..891ba83 100644
--- a/lib/sha1.go
+++ b/lib/sha1.go
@@ -94,6 +94,48 @@ func sha1MessageSchedule(mb []uint32) []uint32 {
 	return w
 }
 
+// Returns Merkle–Damgård padding in bytes for length of mesage `l`
+// bytes.
+func MDPadding(l int) []byte {
+	l = l * 8 // msg size in bits
+
+	// Reckon value of `k`
+	k := 0
+	for ((l + 1 + k) % 512) != 448 {
+		k += 1
+	}
+
+	// Initialize padding bytes
+	pbs := make([]byte, 0)
+
+	// Add bit `1` as byte block.
+	pbs = append(pbs, 0x80)
+	f := 7 // unclaimed bits in last byte of `pbs`
+
+	// Add `k` bit `0`s
+	for i := 0; i < k; i++ {
+		if f == 0 {
+			pbs = append(pbs, 0x0)
+			f = 8
+		}
+		f = f - 1
+	}
+
+	// Add `l` in a 64 bit block in `pbs`
+	l64 := uint64(l)
+	b64 := make([]byte, 8) // last 64-bits
+	for i := 7; i >= 0; i-- {
+		// Get 8 last bits.
+		b64[i] = byte(l64 & 0xFF)
+
+		// Get rid of the last 8 bits.
+		l64 = l64 >> 8
+	}
+	pbs = append(pbs, b64...)
+
+	return pbs
+}
+
 func (s *Sha1) Init(hvs []uint32) {
 	// Set Initial Hash Values.
 	h := make([]uint32, 5)
@@ -194,45 +236,3 @@ func (s *Sha1) MacVerify(secret, msg, mac []byte) bool {
 	}
 	return false
 }
-
-// Returns Merkle–Damgård padding in bytes for length of mesage `l`
-// bytes.
-func MDPadding(l int) []byte {
-	l = l * 8 // msg size in bits
-
-	// Reckon value of `k`
-	k := 0
-	for ((l + 1 + k) % 512) != 448 {
-		k += 1
-	}
-
-	// Initialize padding bytes
-	pbs := make([]byte, 0)
-
-	// Add bit `1` as byte block.
-	pbs = append(pbs, 0x80)
-	f := 7 // unclaimed bits in last byte of `pbs`
-
-	// Add `k` bit `0`s
-	for i := 0; i < k; i++ {
-		if f == 0 {
-			pbs = append(pbs, 0x0)
-			f = 8
-		}
-		f = f - 1
-	}
-
-	// Add `l` in a 64 bit block in `pbs`
-	l64 := uint64(l)
-	b64 := make([]byte, 8) // last 64-bits
-	for i := 7; i >= 0; i-- {
-		// Get 8 last bits.
-		b64[i] = byte(l64 & 0xFF)
-
-		// Get rid of the last 8 bits.
-		l64 = l64 >> 8
-	}
-	pbs = append(pbs, b64...)
-
-	return pbs
-}
-- 
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