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-rw-r--r--lib/sha1.go30
1 files changed, 23 insertions, 7 deletions
diff --git a/lib/sha1.go b/lib/sha1.go
index bfe87b1..34f5f37 100644
--- a/lib/sha1.go
+++ b/lib/sha1.go
@@ -6,8 +6,12 @@ package lib
// SHA-1 implementation.
// Reference https://csrc.nist.gov/publications/detail/fips/180/4/final
+type Sha1 struct {
+ hvs []uint32
+}
+
// Initial hash value.
-var sha1IHashValue []uint32 = []uint32{
+var sha1IHashValues []uint32 = []uint32{
0x67452301,
0xefcdab89,
0x98badcfe,
@@ -149,7 +153,19 @@ func sha1MessageSchedule(mb []uint32) []uint32 {
return w
}
-func Sha1(m []byte) []byte {
+func (s *Sha1) Init(hvs []uint32) {
+ // Set Initial Hash Values.
+ h := make([]uint32, 5)
+ if len(hvs) == 5 {
+ copy(h, hvs)
+ s.hvs = h
+ } else {
+ copy(h, sha1IHashValues)
+ s.hvs = h
+ }
+}
+
+func (s *Sha1) Hash(m []byte) []byte {
// Pad message.
pm := sha1Pad(m)
@@ -158,7 +174,7 @@ func Sha1(m []byte) []byte {
// Initialize hash values.
h := make([]uint32, 5)
- copy(h, sha1IHashValue) // Initial hash values.
+ copy(h, s.hvs) // Initial hash values.
// Process each message block.
for _, mb := range mbs {
@@ -208,12 +224,12 @@ func Sha1(m []byte) []byte {
return d
}
-func Sha1Mac(secret, msg []byte) []byte {
- return Sha1(append(secret, msg...))
+func (s *Sha1) Mac(secret, msg []byte) []byte {
+ return s.Hash(append(secret, msg...))
}
-func Sha1MacVerify(secret, msg, mac []byte) bool {
- if BytesEqual(Sha1(append(secret, msg...)), mac) {
+func (s *Sha1) MacVerify(secret, msg, mac []byte) bool {
+ if BytesEqual(s.Hash(append(secret, msg...)), mac) {
return true
}
return false