added ChecksumAddress according to https://github.com/ethereum/EIPs/issues/55

cmd/geth/main.go

@@ -35,6 +35,7 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/logger"
@@ -654,7 +655,7 @@ func accountCreate(ctx *cli.Context) {
 	if err != nil {
 		utils.Fatalf("Could not create the account: %v", err)
 	}
-	fmt.Printf("Address: %x\n", acct)
+	fmt.Printf("Address: %s\n", crypto.ChecksumAddress(acct.Address))
 }
 
 func accountUpdate(ctx *cli.Context) {

crypto/crypto.go

@@ -41,6 +41,9 @@ import (
 	"github.com/pborman/uuid"
 	"golang.org/x/crypto/pbkdf2"
 	"golang.org/x/crypto/ripemd160"
+
+	"strconv"
+	"strings"
 )
 
 var secp256k1n *big.Int
@@ -346,3 +349,29 @@ func zeroBytes(bytes []byte) {
 		bytes[i] = 0
 	}
 }
+
+
+// for input read: https://github.com/ethereum/EIPs/issues/55
+// modelled after the JavaScript function toChecksumAddress()
+// Convert address into checksummed address
+func ChecksumAddress(a common.Address) string {
+	address := strings.Replace(strings.ToLower(hex.EncodeToString(a.Bytes())), "0x", "", 1)
+	addressHash := hex.EncodeToString(Sha3([]byte(common.Bytes2Hex(a.Bytes()))))
+	checksumAddress := "0x"
+	for i := 0; i < len(address); i++ {
+		// If ith character is 8 to f then make it uppercase
+		l, _ := strconv.ParseInt(string(addressHash[i]), 16, 16)
+		if l > 7 {
+			checksumAddress += strings.ToUpper(string(address[i]))
+		} else {
+			checksumAddress += string(address[i])
+		}
+	}
+	return checksumAddress
+}
+
+// Convert address in Hex format, with or without prefixed 0x into checksummed address
+func ChecksumAddressHex(s string) string {
+	return ChecksumAddress(common.HexToAddress(strings.Replace(strings.ToLower(s), "0x", "", 1)))
+}
+

crypto/crypto_test.go

@@ -26,6 +26,7 @@ import (
 	"os"
 	"testing"
 	"time"
+	"strings"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto/secp256k1"
@@ -247,3 +248,142 @@ func TestPythonIntegration(t *testing.T) {
 	fmt.Printf("msg: %x, privkey: %x sig: %x\n", msg0, k1, sig0)
 	fmt.Printf("msg: %x, privkey: %x sig: %x\n", msg1, k1, sig1)
 }
+
+
+func TestChecksumAddress(t *testing.T) {
+	// 4 groups of tests:
+	// All caps
+	// All lower
+	// Normal = mixed
+	// Taken from myetherwallet.com
+	testcases := []string{
+		"0x52908400098527886E0F7030069857D2E4169EE7",
+		"0x8617E340B3D01FA5F11F306F4090FD50E238070D",
+
+		"0xde709f2102306220921060314715629080e2fb77",
+		"0x27b1fdb04752bbc536007a920d24acb045561c26",
+
+		"0x5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed",
+		"0xfB6916095ca1df60bB79Ce92cE3Ea74c37c5d359",
+		"0xdbF03B407c01E7cD3CBea99509d93f8DDDC8C6FB",
+		"0xD1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb",
+
+		"0x5A4EAB120fB44eb6684E5e32785702FF45ea344D",
+		"0x5be4BDC48CeF65dbCbCaD5218B1A7D37F58A0741",
+		"0xa7dD84573f5ffF821baf2205745f768F8edCDD58",
+		"0x027a49d11d118c0060746F1990273FcB8c2fC196",
+		"0x689E3fE51F45760Ab73D237d28fc1d2C8EaC6D71",
+		"0x97D509F0b388daE6D000C33193F4645D1e71Dc54",
+		"0xa4Fd5bD20Cf5A7CF1c5A6015D2b3e08A3eC1b1a7",
+		"0x230AE42Daf56B494E4b9E6D8Cce99F5E14FE29c1",
+		"0xC19D1EDB7FC943f2abbF576f6058c2425B347AB9",
+		"0x4f936Bb00CaaD116adc3861146dd8f68BF66F4E6",
+		"0xE74287ECA7B7151Fd194cdf7680EB50752671c47",
+		"0x5d32a30FBc5bddF39293CE3a9D74E4505dEb621D",
+		"0x27cBC66cbE3625c2857ce3CF77A9933e589545DF",
+		"0xE2A5f301EA7e461880Fe9A6B4b7EC1aBD023129A",
+		"0xe0DFdDA1D174aB7315C753EA198885ee88B52763",
+		"0x843655C78939365298FD9515b489939bADca64Ec",
+		"0x6bB7a54E4ef381e4C64009DDa0A9ED127aab852C",
+	}
+
+	failed, passed := 0, 0
+	for i := 0; i < len(testcases); i++ {
+		ba, _ := hex.DecodeString(strings.Replace(testcases[i], "0x", "", 1))
+		ca := ChecksumAddress(common.BytesToAddress(ba))
+		if testcases[i] == ca {
+			passed++
+		} else {
+			failed++
+			t.Errorf("Failed to compute ChecksumAddress for address " + testcases[i] + ": \n\tExpected=" + testcases[i] + "\n\tReceived=" + ca)
+		}
+	}
+	fmt.Printf("Passed %d tests and failed %d tests out of %d.\n", passed, failed, passed+failed)
+}
+
+func TestChecksumAddressHex(t *testing.T) {
+	testcases := []string{
+		"0x52908400098527886E0F7030069857D2E4169EE7",
+		"0x8617E340B3D01FA5F11F306F4090FD50E238070D",
+
+		"0xde709f2102306220921060314715629080e2fb77",
+		"0x27b1fdb04752bbc536007a920d24acb045561c26",
+
+		"0x5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed",
+		"0xfB6916095ca1df60bB79Ce92cE3Ea74c37c5d359",
+		"0xdbF03B407c01E7cD3CBea99509d93f8DDDC8C6FB",
+		"0xD1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb",
+
+		"0x5A4EAB120fB44eb6684E5e32785702FF45ea344D",
+		"0x5be4BDC48CeF65dbCbCaD5218B1A7D37F58A0741",
+		"0xa7dD84573f5ffF821baf2205745f768F8edCDD58",
+		"0x027a49d11d118c0060746F1990273FcB8c2fC196",
+		"0x689E3fE51F45760Ab73D237d28fc1d2C8EaC6D71",
+		"0x97D509F0b388daE6D000C33193F4645D1e71Dc54",
+		"0xa4Fd5bD20Cf5A7CF1c5A6015D2b3e08A3eC1b1a7",
+		"0x230AE42Daf56B494E4b9E6D8Cce99F5E14FE29c1",
+		"0xC19D1EDB7FC943f2abbF576f6058c2425B347AB9",
+		"0x4f936Bb00CaaD116adc3861146dd8f68BF66F4E6",
+		"0xE74287ECA7B7151Fd194cdf7680EB50752671c47",
+		"0x5d32a30FBc5bddF39293CE3a9D74E4505dEb621D",
+		"0x27cBC66cbE3625c2857ce3CF77A9933e589545DF",
+		"0xE2A5f301EA7e461880Fe9A6B4b7EC1aBD023129A",
+		"0xe0DFdDA1D174aB7315C753EA198885ee88B52763",
+		"0x843655C78939365298FD9515b489939bADca64Ec",
+		"0x6bB7a54E4ef381e4C64009DDa0A9ED127aab852C",
+	}
+
+	failed, passed := 0, 0
+	for i := 0; i < len(testcases); i++ {
+		ca := ChecksumAddressHex(testcases[i])
+		if testcases[i] == ca {
+			passed++
+		} else {
+			failed++
+			t.Errorf("Failed to compute ChecksumAddressHex for address " + testcases[i] + ": \n\tExpected=" + testcases[i] + "\n\tReceived=" + ca)
+		}
+	}
+
+	testcases = []string{
+		"52908400098527886E0F7030069857D2E4169EE7",
+		"8617E340B3D01FA5F11F306F4090FD50E238070D",
+
+		"de709f2102306220921060314715629080e2fb77",
+		"27b1fdb04752bbc536007a920d24acb045561c26",
+
+		"5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed",
+		"fB6916095ca1df60bB79Ce92cE3Ea74c37c5d359",
+		"dbF03B407c01E7cD3CBea99509d93f8DDDC8C6FB",
+		"D1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb",
+
+		"5A4EAB120fB44eb6684E5e32785702FF45ea344D",
+		"5be4BDC48CeF65dbCbCaD5218B1A7D37F58A0741",
+		"a7dD84573f5ffF821baf2205745f768F8edCDD58",
+		"027a49d11d118c0060746F1990273FcB8c2fC196",
+		"689E3fE51F45760Ab73D237d28fc1d2C8EaC6D71",
+		"97D509F0b388daE6D000C33193F4645D1e71Dc54",
+		"a4Fd5bD20Cf5A7CF1c5A6015D2b3e08A3eC1b1a7",
+		"230AE42Daf56B494E4b9E6D8Cce99F5E14FE29c1",
+		"C19D1EDB7FC943f2abbF576f6058c2425B347AB9",
+		"4f936Bb00CaaD116adc3861146dd8f68BF66F4E6",
+		"E74287ECA7B7151Fd194cdf7680EB50752671c47",
+		"5d32a30FBc5bddF39293CE3a9D74E4505dEb621D",
+		"27cBC66cbE3625c2857ce3CF77A9933e589545DF",
+		"E2A5f301EA7e461880Fe9A6B4b7EC1aBD023129A",
+		"e0DFdDA1D174aB7315C753EA198885ee88B52763",
+		"843655C78939365298FD9515b489939bADca64Ec",
+		"6bB7a54E4ef381e4C64009DDa0A9ED127aab852C",
+	}
+
+	for i := 0; i < len(testcases); i++ {
+		ca := ChecksumAddressHex(testcases[i])
+		if "0x"+testcases[i] == ca {
+			passed++
+		} else {
+			failed++
+			t.Errorf("Failed to compute ChecksumAddressHex for address " + testcases[i] + ": \n\tExpected=" + testcases[i] + "\n\tReceived=" + ca)
+		}
+	}
+	fmt.Printf("Passed %d tests and failed %d tests out of %d.\n", passed, failed, passed+failed)
+}
+