您好我正在尝试运行数字signture，我收到一个错误： ＆＃34;未定义的功能＆＃39; mulinv＆＃39;输入参数类型为＆＃39; double＆＃39;。＆＃34; 我将数字9和23插入为常量，因为错误与变量类型有关。
我的代码是：
addpath('C:\MATLAB\R2015a\VariablePrecisionIntegers');
disp('Implementation of ELGAMAL Digital Signature');
addpath('search-ms:query=mulinv\mulinv');
addpath('');
clear all;
close all;
%%Hardcoded values (vpi stands for VariablePrecisionIntegers, and are used to store large values)
g = vpi(5) %alpha in example
k = vpi(9) %Random number 1<k<p-1 and gcd(k, p ? 1) = 1.
p = vpi(23) %Prime Number
x = vpi(3) %Secret Key 1 < x < p ? 1
m = vpi(7) %Message
y = vpi(2)
r = vpi(2)
s = vpi(2)
%%Key Generation
y = powermod(g,x,p) %y = g^x mod p
%%Signature Generation
r = powermod(g,k,p) %r = g^k mod p
multinver = mulinv(9,23) %Generates multiplicative inverse k^-1 mod p
s = mod(((multinver)*(m-x*r)),p-1) %s = (k^-1)*(m-x*r) mod p-1
%%Verification
zvg = vpi(2);
zvg = powermod (g,m,p) %zvg = g^m mod p
zvyr = vpi(2);
zvyr = mod(((y^r)*(r^s)),p) %zvyr = y^r * r^s mod p
答案 0 :(得分：1)
不要clear all，而只是clear。
如果您clear all还清除了所有添加的路径，那么让Matlab忘记addpath('search-ms:query=mulinv\mulinv');