如何使用PyKCS11库验证签名数据

Question

我编写了一个简单的Python脚本，它使用我的智能卡（Rutoken ECP SC）、PKCS#11库（由我的供应商实现）和PyKCS11 Python包装器进行数字签名。 我已经用这张卡生成了私钥/公钥对，并用pkcs11创建了一个签名，但我不知道如何验证这个签名数据。 但我不知道如何在pks11++库中实现这个问题。如果有人能告诉我如何解决这个问题，我将不胜感激。在

这是我的剧本：

import PyKCS11
import getopt
import sys
import platform

red = blue = magenta = normal = ""
if sys.stdout.isatty() and platform.system().lower() != 'windows':
    red = "\x1b[01;31m"
    blue = "\x1b[34m"
    magenta = "\x1b[35m"
    normal = "\x1b[0m"

format_long = magenta + "  %s:" + blue + " %s (%s)" + normal
format_binary = magenta + "  %s:" + blue + " %d bytes" + normal
format_normal = magenta + "  %s:" + blue + " %s" + normal

pkcs11 = PyKCS11.PyKCS11Lib()
lib_path = "/usr/lib/pkcs11-arm/rtpkcs11ecp/librtpkcs11ecp.so"
pkcs11.load(lib_path)
info = pkcs11.getInfo()
print "Library manufacturerID: " + info.manufacturerID

slots = pkcs11.getSlotList()
print "Available Slots:", len(slots)

# As I understand we need only first slot
if len(slots) > 0:
    slot = slots[0]
    slotInfo = pkcs11.getSlotInfo(slot)
    tokenInfo = pkcs11.getTokenInfo(slot)

    flags = PyKCS11.CKF_RW_SESSION
    session = pkcs11.openSession(slot, flags)
    print "Opened session 0x%08X" % session.session.value()
    pin = "12345678"
    session.login(pin)
    objects = session.findObjects()                
    all_attributes = PyKCS11.CKA.keys()             # all keys supported by SC

    print "Defining KEY_GENERATION mechanism"
    mech = PyKCS11.Mechanism(PyKCS11.CKM_RSA_PKCS_KEY_PAIR_GEN, None)


    print "Generating key"
    public_template = [
        (PyKCS11.CKA_CLASS, PyKCS11.CKO_PUBLIC_KEY),
        (PyKCS11.CKA_PRIVATE, PyKCS11.CK_FALSE),
        (PyKCS11.CKA_TOKEN, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_ENCRYPT, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_VERIFY, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_WRAP, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_KEY_TYPE, PyKCS11.CKK_RSA),
        (PyKCS11.CKA_VERIFY_RECOVER, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_MODULUS_BITS, 2048),
    ]

    private_template = [
        (PyKCS11.CKA_CLASS, PyKCS11.CKO_PRIVATE_KEY),
        (PyKCS11.CKA_PRIVATE, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_TOKEN, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_DECRYPT, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_SIGN, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_UNWRAP, PyKCS11.CK_TRUE)
        ]

    (pub, priv) = session.generateKeyPair(public_template, private_template, mech)

    # ==================================================
    # Signing data
    sourceText = "Hello World"
    binaryData = ' '.join(format(ord(x), 'b') for x in sourceText)

    signMechanism = PyKCS11.Mechanism(PyKCS11.CKM_RSA_PKCS, None)
    signedData = session.sign(priv, binaryData, signMechanism)
    print signedData


    #====================================================
    # now we have to verify signedData using the private key



    session.logout()
    session.closeSession()
    print "Close session 0x%08X" % session.session.value()

这是sign方法的输出：

^{pr2}$

Answer 1

此代码适用于我（注意，公共指数假定为3字节长）：

import PyKCS11
import getopt
import sys
import platform
import hashlib
from M2Crypto import RSA

pkcs11 = PyKCS11.PyKCS11Lib()
lib_path = "/opt/safenet/protecttoolkit5/ptk/lib/libcryptoki.so"
pkcs11.load(lib_path)
info = pkcs11.getInfo()
slots = pkcs11.getSlotList()
if len(slots) > 0:
    session = pkcs11.openSession(slots[0], PyKCS11.CKF_RW_SESSION)
    session.login("12345678")
    mech = PyKCS11.Mechanism(PyKCS11.CKM_RSA_PKCS_KEY_PAIR_GEN, None)
    public_template = [
        (PyKCS11.CKA_CLASS, PyKCS11.CKO_PUBLIC_KEY),
        (PyKCS11.CKA_PRIVATE, PyKCS11.CK_FALSE),
        (PyKCS11.CKA_TOKEN, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_ENCRYPT, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_VERIFY, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_WRAP, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_KEY_TYPE, PyKCS11.CKK_RSA),
        (PyKCS11.CKA_VERIFY_RECOVER, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_MODULUS_BITS, 2048),
    ]
    private_template = [
        (PyKCS11.CKA_CLASS, PyKCS11.CKO_PRIVATE_KEY),
        (PyKCS11.CKA_PRIVATE, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_TOKEN, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_DECRYPT, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_SIGN, PyKCS11.CK_TRUE),
        (PyKCS11.CKA_UNWRAP, PyKCS11.CK_TRUE)
        ]
    (pub, priv) = session.generateKeyPair(public_template, private_template, mech)
    (pubExp,pubModulus) = session.getAttributeValue(pub,[PyKCS11.CKA_PUBLIC_EXPONENT,PyKCS11.CKA_MODULUS], True)
    # ==================================================
    # Signing data
    binaryData = "Hello world"
    # Generate SHA1
    sha1 = hashlib.sha1()
    sha1.update(str(bytearray(binaryData)))
    digest=sha1.digest()
    # Indicate SHA1 is used
    binaryData2='\x30\x21\x30\x09\x06\x05\x2b\x0e\x03\x02\x1a\x05\x00\x04\x14'+digest
    signMechanism = PyKCS11.Mechanism(PyKCS11.CKM_RSA_PKCS, None)
    signedData = session.sign(priv, binaryData2, signMechanism)
    session.logout()
    session.closeSession()
    # ==================================================
    # Verify
    pubkey = RSA.new_pub_key(('\x00\x00\x00\x03' + str(bytearray(pubExp)), '\x00\x00\x01\x01\x00'+str(bytearray(pubModulus))))
    result=pubkey.verify(str(bytearray(digest)), str(bytearray(signedData)), 'sha1')
    print "VERIFY:" + str(result)

我不喜欢python，所以请把它当作概念的证明，而不是解决方案。有趣的部分：

• 由于您的PKCS#11驱动程序不支持带有散列的RSA签名，因此需要计算散列并手动构建DigestInfo ASN.1 part（结果在binaryData2变量中）

• 由于RSA.new_pub_key()为BN_mpi2bn接受一个openssl格式的元组（它在内部使用），所以需要在模数前面加上一个额外的\x00前缀，以确保它被解释为正数（'\x00\x00\x01\x01\x00'部分）

• 给定函数verify()使用openssl的RSA_verify，该函数将签名数据的摘要（而不是数据本身）作为参数，它需要遵守并给它摘要（从签名生成部分重用，如果计划使用单独的verify函数，则必须生成新的摘要）

---

注意：对于SHA256，您需要使用适当的digestInfo magic ASN.1字符串前缀（有关可用值，请参见here）+来自hashlib的适当摘要对象+正确的第三个verify调用参数。在

祝你好运！在