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[原创]第二题子鼠开天
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发表于: 2020-4-16 17:14
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题目用了AES+SHA512+MD5+大数运算，然而几乎没用，不仅这样还出现了多解的情况，详细看截图。题目更新实在是没有收到消息，这也就算了，更新完之后就加了一个限制结果还是多解？？？
import hashlib
def f(x):
return hashlib.md5(hashlib.sha512(x).digest()).digest()
def ff(x):
x+= b'\xde\xed\xbe\xef'
x = f(x)
x += b'\xB9\x79\x37\x9E'
return f(x)
print("".join(list(map(lambda x: '\\'+hex(x)[1:],ff(b'KCTF')))))
#include <stdio.h>
#include <openssl/bn.h>
#include <openssl/aes.h>
int main ()
{
/* I shortened the integer */
unsigned char p_str[] = "\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x14\xaf\x58\xad\x4d\x76\xd5\x9d\x8d\x21\x71\xff\xb4\xca\x22\x31";
unsigned char key[] = "\x69\x82\x30\x28\x57\x74\x65\xAB\x39\x91\xDF\x04\x51\x46\xF9\x1D\x55\x6D\xEE\x88\x70\x84\x5D\x8E\xE1\xCD\x3C\xF7\x7E\x4A\x0C\x39";
unsigned char d_str[] = "\x39\x0a\x68\x4c\xb7\x13\x37\x8f\xfd\x5c\xce\x8c\x40\x00\xb5\xd6\xa2\xbb\x9f\x29\xb6\x3d\x39\x5e\x6b\xe6\xe9\xdd\x94\x15\x27\xbd";
BIGNUM *p = BN_bin2bn(p_str, 32, NULL);
BIGNUM *mod = BN_bin2bn(key, 32, NULL);
BIGNUM *d = BN_bin2bn(d_str, 32, NULL);
BIGNUM *e = BN_new();
BIGNUM *r = BN_new();
BN_set_word(e, 0x10001);
BN_CTX *ctx = BN_CTX_new();
BN_mod_exp(r, p, d, mod, ctx);
char * number_str = BN_bn2hex(r);
printf("%s\n", number_str);
unsigned char mid[32];
unsigned char mid2[32];
BN_bn2bin(r, mid);
unsigned char kkey[] = "\x48\x0B\x62\xC3\xAC\xD6\xC8\xA3\x6B\x18\xD9\xE9\x06\xCD\x90\xD2";
AES_KEY aes_key;
AES_set_encrypt_key(kkey, 128, &aes_key);
AES_ecb_encrypt(mid, mid2, &aes_key, 1);
AES_ecb_encrypt(mid+16, mid2+16, &aes_key, 1);
for(int i = 0; i != 32; ++i)
printf("%x", mid2[i]);
puts("");
BN_free(p);
return 0;
}
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