Aca les dejo este crackeador por fuerza bruta. Funciona de maravilla aunque no es muy rapido por el lenguaje. Quizas les sirva como ejemplo.

Cracker.py -t md5 -h e10adc3949ba59abbe56e057f20f883e -w 1234567890 -a 9 -i 3 -v

Comandos:

-t: Tipo de Hash
-h: Hash a Crackear
-w: Teclas a usar 
-a: Maximo de Caracteres
-i: Minimo de Caracteres
-v: Modo Hacking

Código Fuente:

import sys , string , time
def main():
    "Main"
    title = "MD5 Cracker Brute Force"
    print "\n" + title.center(45) + "\n"
 
def usage():
    "Usage"
    print "[+] Ejemplo : Cracker.py -t md5 -h e10adc3949ba59abbe56e057f20f883e -w 1234567890 -a 9 -i 3 -v"
 
def usagelarge():
    "Usage Large"
    print "\n  Forma de Uso:"
    print "\n  [+]Ejemplo: Cracker.py -t md5 -h e10adc3949ba59abbe56e057f20f883e -w 1234567890 -a 9 -i 3 -v"
    print ""
    print "\t[Comandos]"
    print "\t   -t: Tipo de Hash"
    print "\t   -h: Hash a Crackear"
    print "\t   -w: Teclas a usar" 
    print "\t   -a: Maximo de Caracteres"
    print "\t   -i: Minimo de Caracteres"
    print "\t   -v: Modo Hacking\n"
 
def timer():
    "Time"
    now = time.localtime(time.time())
    return time.asctime(now)
 
if '__main__' == __name__ :
 
    if len(sys.argv) <= 5:
        main()
        usagelarge()
        sys.exit(1)
 
    hhash = words = maxw = minw = typeh = ""
    verbose = 0
 
    for arg in sys.argv[1:]:
        try:
            if arg.lower() == "-v" or arg.lower() == "-verbose":
                    verbose = 1
            if arg.lower() == "-h" or arg.lower() == "-hash":
                    hhash = sys.argv[int(sys.argv[1:].index(arg))+2]
            if arg.lower() == "-a" or arg.lower() == "-max":
                    maxw = sys.argv[int(sys.argv[1:].index(arg))+2]
            if arg.lower() == "-i" or arg.lower() == "-min":
                    minw = sys.argv[int(sys.argv[1:].index(arg))+2]
            if arg.lower() == "-w" or arg.lower() == "-words":
                    words = sys.argv[int(sys.argv[1:].index(arg))+2]
            if arg.lower() == "-t" or arg.lower() == "-type":
                    typeh = sys.argv[int(sys.argv[1:].index(arg))+2]
        except(IndexError):
            print "[+] Comandos Obligatorios -t(Tipo de Hash) -h(Hash) -w(Teclas) -a(Maximo de teclas) -a(Minimo de teclas)"
            usage()
            sys.exit(1)
 
    if minw == "" : minw = '1'
 
    main()
    for args in (typeh, hhash, words, maxw, minw):
        try:
            if args != "":
                if args == typeh :
                    if typeh.lower() != 'md5' or 'sha':
                        if typeh.lower() == "md5" :
                            typeh = '1'
                            print "[+] Tipo de Hash : MD5"
                        elif typeh.lower() == "sha" :
                            typeh = '2'
                            print "[+] Tipo de Hash : SHA1"
                    else:
                        print "[+] Tipo Invalido de Hash"
                        sys.exit(1)
                if args == hhash :
                    if typeh == '1' :
                        if len(hhash) == 32 :
                            print "[+] MD5 Hash : " + hhash
                        else:
                            print "[+] Tipo Invalido de Hash"
                            sys.exit(1)
                    if typeh == '2' :
                        if len(hhash) == 40 :
                            print "[+] SHA1 Hash : " + hhash
                        else:
                            print "[+] SHA1 Invalido"
                            sys.exit(1)
                if args == words :
                    print "[+] Teclas a usar : " + words
                if args == maxw :
                    if maxw.isdigit() != False :
                        if int(maxw) >= 15 :
                            print "[+] Maximo de Digitos : 15 : " + maxw
                            sys.exit(1)
                        else:
                            if int(maxw) > int(minw):
                                print "[+] Maximo de Digitos : " + maxw
                            else:
                                print "[+] El Maximo de Digitos debe ser mayor al Minimo de Digitos"
                                sys.exit(1)
                    else:
                        print "[+] Maximo de Teclas = Digitos"
                        sys.exit(1)
                if args == minw :
                        if minw.isdigit() != False :
                            if int(minw) < int(maxw) :
                                print "[+] Minimo de Digitos : " + minw
                            else:
                                print "[+] El minimo de Digitos debe ser menor al maximo de Digitos"
                                sys.exit(1)
                        else:
                            print "[+] Minimo de Teclas = Digitos"
                            sys.exit(1)
            else:
                print "[+] Comandos Obligatorios -t(Tipo de Hash) -h(Hash) -w(Teclas) -a(Maximo de teclas) -a(Minimo de teclas)"
                usage()
                sys.exit(1)
        except(ValueError):
            print "[+] Formato de comandos erroneo"
            sys.exit(1)
 
    f = open("CRACK.py",'w')
    f.write("#!/usr/bin/env python\n")
    if (typeh == '1') : f.write("import sys , md5 , string , time\n")
    if (typeh == '2') : f.write("import sys , sha , string , time\n")
    tab = '\t'
    f.write("def timer():\n")
    f.write(tab + "now = time.localtime(time.time())\n")
    f.write(tab + "return time.asctime(now)\n")
    f.write("def crackhash():\n")
 
    i = 0 ; inwords = ""
    f.write(tab + "hashh = '" + hhash.lower() +"'\n")
    f.write(tab + "try:\n")
 
    #print words
    for i in words:
        if i == str(words[int(len(words)-1)]) : 
            inwords += "'" + i + "'"
            break
        inwords += "'" + i + "',"
    #print inwords
 
    i = int(minw) ; iwords = "" ; a = 0
 
    while (int(i) != int(maxw) + 1) :
 
        for a in range(i):
            if int(i) != (int(a) + 1):
                iwords += "i" + str(i) + str(a) + " + "
            else:
                 iwords += "i" + str(i) + str(a)
 
            data = (int(a + 2) * tab + "for i" + str(i) + str(a) + " in (" + inwords + "):\n")
            f.write(data)
 
        f.write(int(i + 2) * tab + "word = '' ; value = ''\n")
        f.write(int(i + 2) * tab + "word = " + iwords + "\n")
 
        if typeh == '1' : f.write(int(i + 2) * tab + "hash = md5.new()\n")
 
        if typeh == '2' : f.write(int(i + 2) * tab + "hash = sha.new()\n")
 
        f.write(int(i + 2) * tab + "hash.update(str(word))\n")
        f.write(int(i + 2) * tab + "value = hash.hexdigest()\n") 
        if verbose == 1 : f.write(int(i + 2) * tab + "print " + iwords + ' + " : " + str(value)\n')
        f.write(int(i + 2) * tab + "if str(hashh) == str(value):\n")
        f.write(int(i + 3) * tab + "raise Exception\n")
        iwords = ""
        i += 1
 
    f.write(tab + "except(Exception):")
    f.write('\n'+ 2 * tab + "print '********************  Hash Crackeado ' + 20 * '*'")
    f.write('\n' + 2 * tab + "print '[+] HASH :', hashh")
    f.write('\n' + 2 * tab + "print '[+] PASS :', str(word)")
    f.write('\n' + 2 * tab + "print '[+] Hora de finalizacion :', timer()")
    f.write('\n' + 2 * tab + "sys.exit(1)")
    f.write('\n' + tab + "except(KeyboardInterrupt):")
    f.write('\n' + 2 * tab + "print '[+] Process Ended ',timer()")
    f.write('\n' + 2 * tab + "sys.exit(1)")
    f.write("\ncrackhash()")
    f.close()
 
    print '[+] Hora de inicio : ', timer()
 
    import CRACK
    CRACK.crackhash()

Nota: Corre con Python 2.x

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