func NewTruncatedMD4() *TruncatedMD4 {
return &TruncatedMD4{md4.New(hashSize), hashSize}
}
func main() {
m1 := ToBytes("4d7a9c8356cb927ab9d5a57857a7a5eede748a3cdcc366b3b683a0203b2a5d9fc69d71b3f9e99198d79f805ea63bb2e845dd8e3197e31fe52794bf08b9e8c3e9")
m1p := ToBytes("4d7a9c83d6cb927a29d5a57857a7a5eede748a3cdcc366b3b683a0203b2a5d9fc69d71b3f9e99198d79f805ea63bb2e845dc8e3197e31fe52794bf08b9e8c3e9")
m2 := ToBytes("4d7a9c8356cb927ab9d5a57857a7a5eede748a3cdcc366b3b683a0203b2a5d9fc69d71b3f9e99198d79f805ea63bb2e845dd8e3197e31fe5f713c240a7b8cf69")
// Swap little/big endian
for i := 0; i < len(m1); i += 4 {
for j := 0; j < 2; j++ {
i1 := i + j
i2 := i + 3 - j
c := m1[i1]
m1[i1] = m1[i2]
m1[i2] = c
c = m2[i1]
m2[i1] = m2[i2]
m2[i2] = c
c = m1p[i1]
m1p[i1] = m1p[i2]
m1p[i2] = c
}
}
m1pp := bytes.Repeat([]byte{'x'}, len(m1))
GetPair(m1, m1pp)
// Verify that my Pair method works
if string(m1pp) != string(m1p) {
log.Printf("%x", m1pp)
log.Printf("%x", m1p)
return
}
if !CheckConditions(m1) {
return
}
if !CheckConditions(m2) {
return
}
// CheckConditions(m2)
// md1 := md4.New(16)
// md2 := md4.New(16)
// // md1.Write(m1)
// // md2.Write(m2)
// // log.Printf("%x", md1.Sum(nil))
// // log.Printf("%x", md2.Sum(nil))
// m := []byte(strings.Repeat("x", 64))
// log.Printf("%x", m)
// CheckConditions(m)
// Correct(m, 1)
// Correct(m, 2)
// Correct(m, 4)
// Correct(m, 8)
// Correct(m, 16)
// Correct(m, 32)
// log.Printf("%x", m)
// CheckConditions(m)
log.Printf("Looking for a collision")
M0 := []byte(strings.Repeat("a", 64))
M := make([]byte, len(M0))
Mp := []byte(strings.Repeat("x", 64))
rand.Seed(1)
for trials := 1; ; trials++ {
for i := 0; i <= 21; i++ {
Correct(M, i)
}
if !CheckConditions(M) {
return
}
GetPair(M, Mp)
dig := md4.New(16)
dig.Write(M)
m := dig.Sum(nil)
dig = md4.New(16)
dig.Write(Mp)
mp := dig.Sum(nil)
if string(m) == string(mp) {
log.Printf("%x: %x", m, M)
log.Printf("%x: %x", mp, Mp)
log.Printf("%d tries", trials)
return
}
if trials%1000000 == 0 {
log.Printf("%d tries", trials)
}
for i, _ := range M0 {
M[i] = byte(rand.Uint32())
}
//nextMessage(M0)
//copy(M, M0)
}
}