Charm安装、使用

项目链接：https://github.com/JHUISI/charm

Charm是Joseph A. Akinyele等在2013提出的一个用于进行快速加密的平台(Python库)，
再Charm平台里有着各种工具包能够进行加密，解密等，
具体包括IBE，ABE，AES，DES，RSA等对称以及非堆成加密。

Charm安装前准备


sudo apt install m4 flex bison libssl1.0-dev

目前仅Ubuntu18成功20未成功！！！！

下载PBC库、GMP库：

https://crypto.stanford.edu/pbc/files/pbc-0.5.14.tar.gz

https://ftp.gnu.org/gnu/gmp/gmp-6.2.1.tar.xz

安装GMP库，GMP库是PBC库的基础，如果先安装PBC库会报错xz -d gmp-6.2.1.tar.xz tar -xvf gmp-6.2.1.tar cd gmp-6.2.1./configure##配置成功出现Version:           GNU MP 6.2.1Host type:         kabylake-pc-linux-gnuABI:               64Install prefix:    /usr/localCompiler:          gccStatic libraries:  yesShared libraries:  yes##makemake checksudo make install 安装PBC库tar -zxvf pbc-0.5.14.tar.gzcd pbc-0.5.14./configure##配置成功出现
-----------------------------------------
Sat May 29 23:26:34 CST 2021
host info:        x86_64-unknown-linux-gnu
optimized build:  no
compiler (CC):    gcc
LDFLAGS:
CPPFLAGS:
CFLAGS:            -Wall -W -Wfloat-equal -Wpointer-arith -Wcast-align -Wstrict-prototypes -Wredundant-decls -Wendif-labels -Wshadow -pipe -ffast-math -U__STRICT_ANSI__ -std=gnu99 -fomit-frame-pointer -O3
LEX:              flex
AM_LFLAGS:
LFLAGS:
YACC:             bison -y
AM_YFLAGS:
YFLAGS:
-----------------------------------------
##makemake checksudo make install

执行以下命令安装python的charm包

pip3 install charm-crypto==0.43 -i https://pypi.tuna.tsinghua.edu.cn/simple

安装完后即可在python解释器中尝试

python3import charm
from charm.toolbox.pairinggroup import GT

更新动态链接库的缓存命令sudo ldconfig动态库cd /etc/ld.so.conf.d
ls

例子：

from charm.toolbox.pairinggroup import PairingGroup,ZR,G1,G2,GT,pair
from charm.toolbox.secretutil import SecretUtil
from charm.toolbox.ABEnc import ABEnc, Input, Output# type annotations
pk_t = { 'g':G1, 'g2':G2, 'h':G1, 'f':G1, 'e_gg_alpha':GT }
mk_t = {'beta':ZR, 'g2_alpha':G2 }
sk_t = { 'D':G2, 'Dj':G2, 'Djp':G1, 'S':str }
ct_t = { 'C_tilde':GT, 'C':G1, 'Cy':G1, 'Cyp':G2 }debug = False
class CPabe_BSW07(ABEnc):""">>> from charm.toolbox.pairinggroup import PairingGroup,ZR,G1,G2,GT,pair>>> group = PairingGroup('SS512')>>> cpabe = CPabe_BSW07(group)>>> msg = group.random(GT)>>> attributes = ['ONE', 'TWO', 'THREE']>>> access_policy = '((four or three) and (three or one))'>>> (master_public_key, master_key) = cpabe.setup()>>> secret_key = cpabe.keygen(master_public_key, master_key, attributes)>>> cipher_text = cpabe.encrypt(master_public_key, msg, access_policy)>>> decrypted_msg = cpabe.decrypt(master_public_key, secret_key, cipher_text)>>> msg == decrypted_msgTrue""" def __init__(self, groupObj):ABEnc.__init__(self)global util, grouputil = SecretUtil(groupObj, verbose=False)group = groupObj@Output(pk_t, mk_t)    def setup(self):g, gp = group.random(G1), group.random(G2)alpha, beta = group.random(ZR), group.random(ZR)# initialize pre-processing for generatorsg.initPP(); gp.initPP()h = g ** beta; f = g ** ~betae_gg_alpha = pair(g, gp ** alpha)pk = { 'g':g, 'g2':gp, 'h':h, 'f':f, 'e_gg_alpha':e_gg_alpha }mk = {'beta':beta, 'g2_alpha':gp ** alpha }return (pk, mk)@Input(pk_t, mk_t, [str])@Output(sk_t)def keygen(self, pk, mk, S):r = group.random() g_r = (pk['g2'] ** r)    D = (mk['g2_alpha'] * g_r) ** (1 / mk['beta'])        D_j, D_j_pr = {}, {}for j in S:r_j = group.random()D_j[j] = g_r * (group.hash(j, G2) ** r_j)D_j_pr[j] = pk['g'] ** r_jreturn { 'D':D, 'Dj':D_j, 'Djp':D_j_pr, 'S':S }@Input(pk_t, GT, str)@Output(ct_t)def encrypt(self, pk, M, policy_str): policy = util.createPolicy(policy_str)a_list = util.getAttributeList(policy)s = group.random(ZR)shares = util.calculateSharesDict(s, policy)      C = pk['h'] ** sC_y, C_y_pr = {}, {}for i in shares.keys():j = util.strip_index(i)C_y[i] = pk['g'] ** shares[i]C_y_pr[i] = group.hash(j, G2) ** shares[i] return { 'C_tilde':(pk['e_gg_alpha'] ** s) * M,'C':C, 'Cy':C_y, 'Cyp':C_y_pr, 'policy':policy_str, 'attributes':a_list }@Input(pk_t, sk_t, ct_t)@Output(GT)def decrypt(self, pk, sk, ct):policy = util.createPolicy(ct['policy'])pruned_list = util.prune(policy, sk['S'])if pruned_list == False:return Falsez = util.getCoefficients(policy)A = 1 for i in pruned_list:j = i.getAttributeAndIndex(); k = i.getAttribute()A *= ( pair(ct['Cy'][j], sk['Dj'][k]) / pair(sk['Djp'][k], ct['Cyp'][j]) ) ** z[j]return ct['C_tilde'] / (pair(ct['C'], sk['D']) / A)def main():   groupObj = PairingGroup('SS512')cpabe = CPabe_BSW07(groupObj)attrs = ['ONE', 'TWO', 'THREE']access_policy = '((four or three) and (three or one))'if debug:print("Attributes =>", attrs); print("Policy =>", access_policy)(pk, mk) = cpabe.setup()sk = cpabe.keygen(pk, mk, attrs)print("sk :=>", sk)rand_msg = groupObj.random(GT)if debug: print("msg =>", rand_msg)ct = cpabe.encrypt(pk, rand_msg, access_policy)if debug: print("\n\nCiphertext...\n")groupObj.debug(ct)rec_msg = cpabe.decrypt(pk, sk, ct)if debug: print("\n\nDecrypt...\n")if debug: print("Rec msg =>", rec_msg)assert rand_msg == rec_msg, "FAILED Decryption: message is incorrect"if debug: print("Successful Decryption!!!")if __name__ == "__main__":debug = Truemain()

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