3 files changed, 1776 insertions, 0 deletions
diff --git a/ethcrypto/mnemonic.go b/ethcrypto/mnemonic.go
new file mode 100644
index 000000000..6134f85f7
--- /dev/null
+++ b/ethcrypto/mnemonic.go
@@ -0,0 +1,76 @@
+package ethcrypto
+
+import (
+	"fmt"
+	"io/ioutil"
+	"path"
+	"runtime"
+	"strconv"
+	"strings"
+)
+
+func InitWords() []string {
+	_, thisfile, _, _ := runtime.Caller(1)
+	filename := path.Join(path.Dir(thisfile), "mnemonic.words.lst")
+	content, err := ioutil.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Errorf("reading mnemonic word list file 'mnemonic.words.lst' failed: ", err))
+	}
+	return strings.Split(string(content), "\n")
+}
+
+var words = InitWords()
+
+// TODO: See if we can refactor this into a shared util lib if we need it multiple times
+func IndexOf(slice []string, value string) int64 {
+	for p, v := range slice {
+		if v == value {
+			return int64(p)
+		}
+	}
+	return -1
+}
+
+func MnemonicEncode(message string) []string {
+	var out []string
+	n := int64(len(words))
+
+	for i := 0; i < len(message); i += (len(message) / 8) {
+		x := message[i : i+8]
+		bit, _ := strconv.ParseInt(x, 16, 64)
+		w1 := (bit % n)
+		w2 := ((bit / n) + w1) % n
+		w3 := ((bit / n / n) + w2) % n
+		out = append(out, words[w1], words[w2], words[w3])
+	}
+	return out
+}
+
+func MnemonicDecode(wordsar []string) string {
+	var out string
+	n := int64(len(words))
+
+	for i := 0; i < len(wordsar); i += 3 {
+		word1 := wordsar[i]
+		word2 := wordsar[i+1]
+		word3 := wordsar[i+2]
+		w1 := IndexOf(words, word1)
+		w2 := IndexOf(words, word2)
+		w3 := IndexOf(words, word3)
+
+		y := (w2 - w1) % n
+		z := (w3 - w2) % n
+
+		// Golang handles modulo with negative numbers different then most languages
+		// The modulo can be negative, we don't want that.
+		if z < 0 {
+			z += n
+		}
+		if y < 0 {
+			y += n
+		}
+		x := w1 + n*(y) + n*n*(z)
+		out += fmt.Sprintf("%08x", x)
+	}
+	return out
+}
diff --git a/ethcrypto/mnemonic.words.lst b/ethcrypto/mnemonic.words.lst
new file mode 100644
index 000000000..6bf412ce1
--- /dev/null
+++ b/ethcrypto/mnemonic.words.lst
@@ -0,0 +1,1626 @@
+like
+just
+love
+know
+never
+want
+time
+out
+there
+make
+look
+eye
+down
+only
+think
+heart
+back
+then
+into
+about
+more
+away
+still
+them
+take
+thing
+even
+through
+long
+always
+world
+too
+friend
+tell
+try
+hand
+thought
+over
+here
+other
+need
+smile
+again
+much
+cry
+been
+night
+ever
+little
+said
+end
+some
+those
+around
+mind
+people
+girl
+leave
+dream
+left
+turn
+myself
+give
+nothing
+really
+off
+before
+something
+find
+walk
+wish
+good
+once
+place
+ask
+stop
+keep
+watch
+seem
+everything
+wait
+got
+yet
+made
+remember
+start
+alone
+run
+hope
+maybe
+believe
+body
+hate
+after
+close
+talk
+stand
+own
+each
+hurt
+help
+home
+god
+soul
+new
+many
+two
+inside
+should
+true
+first
+fear
+mean
+better
+play
+another
+gone
+change
+use
+wonder
+someone
+hair
+cold
+open
+best
+any
+behind
+happen
+water
+dark
+laugh
+stay
+forever
+name
+work
+show
+sky
+break
+came
+deep
+door
+put
+black
+together
+upon
+happy
+such
+great
+white
+matter
+fill
+past
+please
+burn
+cause
+enough
+touch
+moment
+soon
+voice
+scream
+anything
+stare
+sound
+red
+everyone
+hide
+kiss
+truth
+death
+beautiful
+mine
+blood
+broken
+very
+pass
+next
+forget
+tree
+wrong
+air
+mother
+understand
+lip
+hit
+wall
+memory
+sleep
+free
+high
+realize
+school
+might
+skin
+sweet
+perfect
+blue
+kill
+breath
+dance
+against
+fly
+between
+grow
+strong
+under
+listen
+bring
+sometimes
+speak
+pull
+person
+become
+family
+begin
+ground
+real
+small
+father
+sure
+feet
+rest
+young
+finally
+land
+across
+today
+different
+guy
+line
+fire
+reason
+reach
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+build
+dust
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+kept
+pay
+phone
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+ball
+beyond
+hidden
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+taken
+fail
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+pure
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+space
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+mention
+mist
+moan
+mumble
+mutter
+observe
+ode
+pathetic
+pattern
+pie
+prefer
+puff
+rape
+rare
+revenge
+rude
+scrape
+spiral
+squeeze
+strain
+sunset
+suspend
+sympathy
+thigh
+throne
+total
+unseen
+weapon
+weary
+\ No newline at end of file
diff --git a/ethcrypto/mnemonic_test.go b/ethcrypto/mnemonic_test.go
new file mode 100644
index 000000000..8bd8859ae
--- /dev/null
+++ b/ethcrypto/mnemonic_test.go
@@ -0,0 +1,74 @@
+package ethcrypto
+
+import (
+	"testing"
+)
+
+func TestMnDecode(t *testing.T) {
+	words := []string{
+		"ink",
+		"balance",
+		"gain",
+		"fear",
+		"happen",
+		"melt",
+		"mom",
+		"surface",
+		"stir",
+		"bottle",
+		"unseen",
+		"expression",
+		"important",
+		"curl",
+		"grant",
+		"fairy",
+		"across",
+		"back",
+		"figure",
+		"breast",
+		"nobody",
+		"scratch",
+		"worry",
+		"yesterday",
+	}
+	encode := "c61d43dc5bb7a4e754d111dae8105b6f25356492df5e50ecb33b858d94f8c338"
+	result := MnemonicDecode(words)
+	if encode != result {
+		t.Error("We expected", encode, "got", result, "instead")
+	}
+}
+func TestMnEncode(t *testing.T) {
+	encode := "c61d43dc5bb7a4e754d111dae8105b6f25356492df5e50ecb33b858d94f8c338"
+	result := []string{
+		"ink",
+		"balance",
+		"gain",
+		"fear",
+		"happen",
+		"melt",
+		"mom",
+		"surface",
+		"stir",
+		"bottle",
+		"unseen",
+		"expression",
+		"important",
+		"curl",
+		"grant",
+		"fairy",
+		"across",
+		"back",
+		"figure",
+		"breast",
+		"nobody",
+		"scratch",
+		"worry",
+		"yesterday",
+	}
+	words := MnemonicEncode(encode)
+	for i, word := range words {
+		if word != result[i] {
+			t.Error("Mnenonic does not match:", words, result)
+		}
+	}
+}