shaojunhan / rsa Goto Github PK
View Code? Open in Web Editor NEWC++ code of 1024 rsa
C++ code of 1024 rsa
个人认为由于未使用快速模幂算法。
Line 56 in 61a3eb7
if (n == BigInt::One) return false;
Line 175 in 61a3eb7
1右移32位在vs2010 debug模式下还是1. 32位整型右移32位是未定义行为,会引起bug
C99中,对右移有这样的规定:
If the value of the right operand is negative or is
greater than or equal to the width of the promoted left operand, the behavior is undefined.
a=a>>(BigInt::basebitnum);//BigInt::basebitnum = 32
在copyFromLong里,这个语句好像没什么意义,不是把a设为0吗。不知道作者您的意图,希望指点一下。另外,通过学习你的代码学到了很多,谢谢。
如题
也许可以使用更优秀的质数生成算法,而不是while嵌套
0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff * 0xffffffffffffffff 应为0xfffffffffffffffeffffffffffffffffffffffffffffffffffffffffffffffff0000000000000001。但是结果为0xFFFFFFDFFFFFFFC0FFFFFFC1FFFFFFC1FFFFFFC1FFFFFFC1FFFFFFC1FFFFFFC1FFFFFFE100000001.
可见:0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff * 0xffffffffffffffff / 0xffffffffffffffff != 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
把代码加入到动态库中后,一加载动态库就失败,get错误 3765269347,应该是出在BigInt里面,但是没定位到问题
用debug编译后程序不能正常运行,无法进入main函数
如题
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