MATLAB实现SHA

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MATLAB实现SHA

2023-09-10 23:15| 来源: 网络整理| 查看: 265

SHA (Secure Hash Algorithm，译作安全散列算法) 是美国国家安全局 (NSA) 设计，美国国家标准与技术研究院 (NIST) 发布的一系列密码散列函数。

特点是一次一密,无法破解

下面直接上MATLAB代码

首先是生成Hash函数的m文件

inp -> 你的密钥

meth -> 加密方案,可选MD2, MD5, SHA-1, SHA-256, SHA-384, SHA-512

function h = hash(inp,meth) % HASH - Convert an input variable into a message digest using any of % several common hash algorithms % % USAGE: h = hash(inp,'meth') % % inp = input variable, of any of the following classes: % char, uint8, logical, double, single, int8, uint8, % int16, uint16, int32, uint32, int64, uint64 % h = hash digest output, in hexadecimal notation % meth = hash algorithm, which is one of the following: % MD2, MD5, SHA-1, SHA-256, SHA-384, or SHA-512 % % NOTES: (1) If the input is a string or uint8 variable, it is hashed % as usual for a byte stream. Other classes are converted into % their byte-stream values. In other words, the hash of the % following will be identical: % 'abc' % uint8('abc') % char([97 98 99]) % The hash of the follwing will be different from the above, % because class "double" uses eight byte elements: % double('abc') % [97 98 99] % You can avoid this issue by making sure that your inputs % are strings or uint8 arrays. % (2) The name of the hash algorithm may be specified in lowercase % and/or without the hyphen, if desired. For example, % h=hash('my text to hash','sha256'); % (3) Carefully tested, but no warranty. Use at your own risk. % (4) Michael Kleder, Nov 2005 % % EXAMPLE: % % algs={'MD2','MD5','SHA-1','SHA-256','SHA-384','SHA-512'}; % for n=1:6 % h=hash('my sample text',algs{n}); % disp([algs{n} ' (' num2str(length(h)*4) ' bits):']) % disp(h) % end inp=inp(:); % convert strings and logicals into uint8 format if ischar(inp) || islogical(inp) inp=uint8(inp); else % convert everything else into uint8 format without loss of data inp=typecast(inp,'uint8'); end % verify hash method, with some syntactical forgiveness: meth=upper(meth); switch meth case 'SHA1' meth='SHA-1'; case 'SHA256' meth='SHA-256'; case 'SHA384' meth='SHA-384'; case 'SHA512' meth='SHA-512'; otherwise end algs={'MD2','MD5','SHA-1','SHA-256','SHA-384','SHA-512'}; if isempty(strcmp(algs,meth)) error(['Hash algorithm must be ' ... 'MD2, MD5, SHA-1, SHA-256, SHA-384, or SHA-512']); end % create hash x=java.security.MessageDigest.getInstance(meth); x.update(inp); h=typecast(x.digest,'uint8'); h=dec2hex(h)'; if(size(h,1))==1 % remote possibility: all hash bytes 128, so pad: h=[repmat('0',[1 size(h,2)]);h]; end h=lower(h(:)'); clear x return

下面是利用得到的哈希密文来生成0/1二进制码流,主要思想是,利用得到的密文的每一位,来当做密钥,用hash函数再加密.最后判断密文是字母还是数字.字母记为1,数字记为0,这样就得到了一串二进制码流.

function random_sequence = get_hash_sequence(K,meth) clc; hash_str = hash(K,meth); hash_str_len = length(hash_str); random_sequence = zeros([1,hash_str_len^2]); random_sequence_index = 1; count_1 = 1; for i=1:hash_str_len hash_temp_str = hash(hash_str(i:i),meth); hash_temp_str = isletter(hash_temp_str); for j=1:hash_str_len random_sequence(random_sequence_index) = hash_temp_str(j); if hash_temp_str(j) == 1 count_1 = count_1 + 1; end random_sequence_index = random_sequence_index + 1; end end % 查看我们生成的二进制码流有多少个1 disp(count_1); % 查看我们生成的二进制码流组成图片是什么样的. img_hash = zeros([hash_str_len,hash_str_len]); for i =1:hash_str_len for j =1:hash_str_len img_hash(i,j) = random_sequence((i-1)*hash_str_len + j); end end figure; imshow(img_hash); end

参考: https://www.ilovematlab.cn/thread-147875-1-1.html

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MATLAB实现SHA

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