SHAKE Stirs-up Crypto

Prof Bill Buchanan OBE
Jun 13 · 4 min read

A Hash Function: SHA-3

SHA-3-224	e642824c3f8cf24a d09234ee7d3c766f c9a3a5168d0c94ad 73b46fdf
SHA-3-256 3a985da74fe225b2 045c172d6bd390bd 855f086e3e9d525b 46bfe24511431532
SHA-3-384 ec01498288516fc9 26459f58e2c6ad8d f9b473cb0fc08c25 96da7cf0e49be4b2 98d88cea927ac7f5 39f1edf228376d25
SHA-3-512 b751850b1a57168a 5693cd924b6b096e 08f621827444f70d 884f5d0240d2712e 10e116e9192af3c9 1a7ec57647e39340 57340b4cf408d5a5 6592f8274eec53f0
SHA-3-224	6b4e03423667dbb7 3b6e15454f0eb1ab d4597f9a1b078e3f 5b5a6bc7
SHA-3-256 a7ffc6f8bf1ed766 51c14756a061d662 f580ff4de43b49fa 82d80a4b80f8434a
SHA-3-384 0c63a75b845e4f7d 01107d852e4c2485 c51a50aaaa94fc61 995e71bbee983a2a c3713831264adb47 fb6bd1e058d5f004
SHA-3-512 a69f73cca23a9ac5 c8b567dc185a756e 97c982164fe25859 e0d1dcc1475c80a6 15b2123af1f5f94c 11e3e9402c3ac558 f500199d95b6d3e3 01758586281dcd26

SHAKE

Input word: hello123
Length (bytes): 8
-----SHAKE-----Shake 128 bit: 1b85861510bc4d8e
Shake 256 bit: ade612ba265f92de
Input word: hello123
Length (bytes): 1
— — -SHAKE — — -Shake 128 bit: 1b
Shake 256 bit: ad
-----SHAKE-----Shake 128 bit:  1b85861510bc4d8e467d6f8a92270533cbaa7ba5e06c2d2a502854bac468b8b9
Shake 256 bit: ade612ba265f92de4a37db5e252906218b453f68b57479ef2ec41db0db6b1855
import sys
import hashlib
import sha3
data=""
size=16
if (len(sys.argv)>1):
data=sys.argv[1]
if (len(sys.argv)>2):
size=int(sys.argv[2])
print 'Input word:',data
print 'Length (bytes):',size
print '\n-----SHAKE-----\n'
s = sha3.shake_128()
s.update(data)
print 'Shake 128 bit: ',s.hexdigest(size)
s = sha3.shake_256()
s.update(data)
print 'Shake 256 bit: ',s.hexdigest(size)
cSHAKE(custom_string=“MySalt”, input=“key || myMessage”)
package mainimport(
"fmt"
"golang.org/x/crypto/sha3"
"os"
"strconv"
)
func main(){ str1:="abc"
length:=8
argCount := len(os.Args[1:]) if (argCount>0) {str1 = string(os.Args[1])}
if (argCount>1) {length,_ = strconv.Atoi(os.Args[2])}
buf := []byte(str1) h := make([]byte, length) sha3.ShakeSum128(h, buf)
fmt.Printf("Shake 128: %x\n", h)
sha3.ShakeSum256(h, buf)
fmt.Printf("Shake 256: %x\n", h)
}

Conclusions

ASecuritySite: When Bob Met Alice

This publication brings together interesting articles related to cyber security.

Prof Bill Buchanan OBE

Written by

Prof at Napier. Serial innovator. Crypto Punk. Believer in fairness, justice & freedom. EU Citizen. Auld Reekie native. Old World Breaker. New World Creator.

ASecuritySite: When Bob Met Alice

This publication brings together interesting articles related to cyber security.