added libtommath-0.04
This commit is contained in:
Tom St Denis
Steffen Jaeckel
parent
f89172c3af
commit
e051ed159b
9
bn.h
9
bn.h
@ -83,6 +83,9 @@ int mp_init(mp_int *a);
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/* free a bignum */
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void mp_clear(mp_int *a);
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/* exchange two ints */
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void mp_exch(mp_int *a, mp_int *b);
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/* shrink ram required for a bignum */
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int mp_shrink(mp_int *a);
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@ -214,7 +217,11 @@ int mp_lcm(mp_int *a, mp_int *b, mp_int *c);
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/* used to setup the Barrett reduction for a given modulus b */
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int mp_reduce_setup(mp_int *a, mp_int *b);
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/* Barrett Reduction, computes a (mod b) with a precomputed value c */
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/* Barrett Reduction, computes a (mod b) with a precomputed value c
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*
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* Assumes that 0 < a <= b^2, note if 0 > a > -(b^2) then you can merely
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* compute the reduction as -1 * mp_reduce(mp_abs(a)) [pseudo code].
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*/
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int mp_reduce(mp_int *a, mp_int *b, mp_int *c);
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/* d = a^b (mod c) */
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163
bn.tex
163
bn.tex
@ -1,7 +1,7 @@
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\documentclass{article}
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\begin{document}
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\title{LibTomMath v0.03 \\ A Free Multiple Precision Integer Library}
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\title{LibTomMath v0.04 \\ A Free Multiple Precision Integer Library}
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\author{Tom St Denis \\ tomstdenis@iahu.ca}
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\maketitle
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\newpage
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@ -323,46 +323,161 @@ The integers are stored in big endian format as most libraries (and MPI) expect.
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\textbf{mp\_toradix} functions read and write (respectively) null terminated ASCII strings in a given radix. Valid values
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for the radix are between 2 and 64 (inclusively).
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\section{Function Analysis}
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Throughout the function analysis the variable $N$ will denote the average size of an input to a function as measured
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by the number of digits it has. The variable $W$ will denote the number of bits per word and $c$ will denote a small
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constant amount of work. The big-oh notation will be abused slightly to consider numbers that do not grow to infinity.
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That is we shall consider $O(N/2) \ne O(N)$ which is an abuse of the notation.
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\subsection{Digit Manipulation Functions}
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The class of digit manipulation functions such as \textbf{mp\_rshd}, \textbf{mp\_lshd} and \textbf{mp\_mul\_2} are all
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very simple functions to analyze.
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\subsubsection{mp\_rshd(mp\_int *a, int b)}
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If the shift count ``b'' is less than or equal to zero the function returns without doing any work. If the
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the shift count is larger than the number of digits in ``a'' then ``a'' is simply zeroed without shifting digits.
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This function requires no additional memory and $O(N)$ time.
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\subsubsection{mp\_lshd(mp\_int *a, int b)}
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If the shift count ``b'' is less than or equal to zero the function returns success without doing any work.
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This function requires $O(b)$ additional digits of memory and $O(N)$ time.
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\subsubsection{mp\_div\_2d(mp\_int *a, int b, mp\_int *c, mp\_int *d)}
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If the shift count ``b'' is less than or equal to zero the function places ``a'' in ``c'' and returns success.
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This function requires $O(2 \cdot N)$ additional digits of memory and $O(2 \cdot N)$ time.
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\subsubsection{mp\_mul\_2d(mp\_int *a, int b, mp\_int *c)}
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If the shift count ``b'' is less than or equal to zero the function places ``a'' in ``c'' and returns success.
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This function requires $O(N)$ additional digits of memory and $O(2 \cdot N)$ time.
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\subsubsection{mp\_mod\_2d(mp\_int *a, int b, mp\_int *c)}
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If the shift count ``b'' is less than or equal to zero the function places ``a'' in ``c'' and returns success.
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This function requires $O(N)$ additional digits of memory and $O(2 \cdot N)$ time.
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\subsection{Basic Arithmetic}
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\subsubsection{mp\_cmp(mp\_int *a, mp\_int *b)}
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Performs a \textbf{signed} comparison between ``a'' and ``b'' returning
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\textbf{MP\_GT} is ``a'' is larger than ``b''.
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This function requires no additional memory and $O(N)$ time.
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\subsubsection{mp\_cmp\_mag(mp\_int *a, mp\_int *b)}
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Performs a \textbf{unsigned} comparison between ``a'' and ``b'' returning
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\textbf{MP\_GT} is ``a'' is larger than ``b''. Note that this comparison is unsigned which means it will report, for
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example, $-5 > 3$. By comparison mp\_cmp will report $-5 < 3$.
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This function requires no additional memory and $O(N)$ time.
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\subsubsection{mp\_add(mp\_int *a, mp\_int *b, mp\_int *c)}
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Handles the sign of the numbers correctly which means it will subtract as required, e.g. $a + -b$ turns into $a - b$.
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This function requires no additional memory and $O(N)$ time.
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\subsubsection{mp\_sub(mp\_int *a, mp\_int *b, mp\_int *c)}
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Handles the sign of the numbers correctly which means it will add as required, e.g. $a - -b$ turns into $a + b$.
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This function requires no additional memory and $O(N)$ time.
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\subsubsection{mp\_mul(mp\_int *a, mp\_int *b, mp\_int *c)}
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Handles the sign of the numbers correctly which means it will correct the sign of the product as required,
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e.g. $a \cdot -b$ turns into $-ab$.
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For relatively small inputs, that is less than 80 digits a standard baseline or comba-baseline multiplier is used. It
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requires no additional memory and $O(N^2)$ time. The comba-baseline multiplier is only used if it can safely be used
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without losing carry digits. The comba method is faster than the baseline method but cannot always be used which is why
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both are provided. The code will automatically determine when it can be used. If the digit count is higher
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than 80 for the inputs than a Karatsuba multiplier is used which requires approximately $O(6 \cdot N)$ memory and
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$O(N^{lg(3)})$ time.
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\subsubsection{mp\_sqr(mp\_int *a, mp\_int *b)}
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For relatively small inputs, that is less than 80 digits a modified squaring or comba-squaring algorithm is used. It
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requires no additional memory and $O((N^2 + N)/2)$ time. The comba-squaring method is used only if it can be safely used
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without losing carry digits. After 80 digits a Karatsuba squaring algorithm is used whcih requires approximately
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$O(4 \cdot N)$ memory and $O(N^{lg(3)})$ time.
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\subsubsection{mp\_div(mp\_int *a, mp\_int *b, mp\_int *c, mp\_int *d)}
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The quotient is placed in ``c'' and the remainder in ``d''. Either (or both) of ``c'' and ``d'' can be set to NULL
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if the value is not desired.
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This function requires $O(4 \cdot N)$ memory and $O(N^2 + N)$ time.
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\subsection{Modular Arithmetic}
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\subsubsection{mp\_addmod, mp\_submod, mp\_mulmod, mp\_sqrmod}
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These functions take the time of their host function plus the time it takes to perform a division. For example,
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mp\_addmod takes $O(N + (N^2 + N))$ time. Note that if you are performing many modular operations in a row with
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the same modulus you should consider Barrett reductions.
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NOTE: This section will be expanded upon in future releases of the library.
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\subsubsection{mp\_invmod(mp\_int *a, mp\_int *b, mp\_int *c)}
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This function is technically only defined for moduli who are positive and inputs that are positive. That is it will find
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$c = 1/a \mbox{ (mod }b\mbox{)}$ for any $a > 0$ and $b > 0$. The function will work for negative values of $a$ since
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it merely computes $c = -1 \cdot (1/{\vert a \vert}) \mbox{ (mod }b\mbox{)}$. In general the input is only
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\textbf{guaranteed} to lead to a correct output if $-b < a < b$ and $(a, b) = 1$.
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NOTE: This function will be revised to accept a wider range of inputs in future releases.
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\section{Timing Analysis}
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\subsection{Observed Timings}
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A simple test program ``demo.c'' was developed which builds with either MPI or LibTomMath (without modification). The
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test was conducted on an AMD Athlon XP processor with 266Mhz DDR memory and the GCC 3.2 compiler\footnote{With build
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options ``-O3 -fomit-frame-pointer -funroll-loops''}. The multiplications and squarings were repeated 10,000 times
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each while the modular exponentiation (exptmod) were performed 10 times each. The RDTSC (Read Time Stamp Counter) instruction
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was used to measure the time the entire iterations took and was divided by the number of iterations to get an
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average. The following results were observed.
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options ``-O3 -fomit-frame-pointer -funroll-loops''}. The multiplications and squarings were repeated 100,000 times
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each while the modular exponentiation (exptmod) were performed 50 times each. The ``inversions'' refers to multiplicative
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inversions modulo an odd number of a given size. The RDTSC (Read Time Stamp Counter) instruction was used to measure the
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time the entire iterations took and was divided by the number of iterations to get an average. The following results
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were observed.
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\begin{small}
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\begin{center}
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\begin{tabular}{c|c|c|c}
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\hline \textbf{Operation} & \textbf{Size (bits)} & \textbf{Time with MPI (cycles)} & \textbf{Time with LibTomMath (cycles)} \\
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\hline
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Multiply & 128 & 1,426 & 928 \\
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Multiply & 256 & 2,551 & 1,787 \\
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Multiply & 512 & 7,913 & 3,458 \\
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Multiply & 1024 & 28,496 & 9,271 \\
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Multiply & 2048 & 109,897 & 29,917 \\
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Multiply & 4096 & 469,970 & 123,934 \\
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Inversion & 128 & 264,083 & 172,381 \\
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Inversion & 256 & 549,370 & 381,237 \\
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Inversion & 512 & 1,675,975 & 1,212,341 \\
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Inversion & 1024 & 5,237,957 & 3,114,144 \\
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Inversion & 2048 & 17,871,944 & 8,137,896 \\
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Inversion & 4096 & 66,610,468 & 22,469,360 \\
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\hline
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Multiply & 128 & 1,426 & 847 \\
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Multiply & 256 & 2,551 & 1,848 \\
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Multiply & 512 & 7,913 & 3,505 \\
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Multiply & 1024 & 28,496 & 9,097 \\
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Multiply & 2048 & 109,897 & 29,497 \\
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Multiply & 4096 & 469,970 & 112,651 \\
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\hline
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Square & 128 & 1,319 & 1,230 \\
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Square & 256 & 1,776 & 2,131 \\
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Square & 512 & 5,399 & 3,694 \\
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Square & 1024 & 18,991 & 9,172 \\
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Square & 2048 & 72,126 & 27,352 \\
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Square & 4096 & 306,269 & 110,607 \\
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Square & 128 & 1,319 & 883 \\
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Square & 256 & 1,776 & 1,895 \\
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Square & 512 & 5,399 & 3,543 \\
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Square & 1024 & 18,991 & 8,692 \\
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Square & 2048 & 72,126 & 26,792 \\
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Square & 4096 & 306,269 & 103,263 \\
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\hline
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Exptmod & 512 & 32,021,586 & 6,880,075 \\
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Exptmod & 768 & 97,595,492 & 15,202,614 \\
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Exptmod & 1024 & 223,302,532 & 28,081,865 \\
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Exptmod & 2048 & 1,682,223,369 & 146,545,454 \\
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Exptmod & 2560 & 3,268,615,571 & 310,970,112 \\
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Exptmod & 3072 & 5,597,240,141 & 480,703,712 \\
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Exptmod & 4096 & 13,347,270,891 & 985,918,868
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Exptmod & 512 & 32,021,586 & 7,096,687 \\
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Exptmod & 768 & 97,595,492 & 14,849,813 \\
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Exptmod & 1024 & 223,302,532 & 27,826,489 \\
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Exptmod & 2048 & 1,682,223,369 & 142,026,274 \\
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Exptmod & 2560 & 3,268,615,571 & 292,597,205 \\
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Exptmod & 3072 & 5,597,240,141 & 452,731,243 \\
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Exptmod & 4096 & 13,347,270,891 & 941,433,401
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\end{tabular}
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\end{center}
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\end{small}
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Note that the figures do fluctuate but their magnitudes are relatively intact. The purpose of the chart is not to
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get an exact timing but to compare the two libraries. For example, in all of the tests the exact time for a 512-bit
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squaring operation was not the same. The observed times were all approximately 3,500 cycles, more importantly they
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were always faster than the timings observed with MPI by about the same magnitude.
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\subsection{Digit Size}
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The first major constribution to the time savings is the fact that 28 bits are stored per digit instead of the MPI
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defualt of 16. This means in many of the algorithms the savings can be considerable. Consider a baseline multiplier
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@ -1,3 +1,10 @@
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Dec 29th, 2002
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v0.04 -- Fixed a memory leak in mp_to_unsigned_bin
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-- optimized invmod code
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-- Fixed bug in mp_div
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-- use exchange instead of copy for results
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-- added a bit more to the manual
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Dec 27th, 2002
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v0.03 -- Sped up s_mp_mul_high_digs by not computing the carries of the lower digits
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-- Fixed a bug where mp_set_int wouldn't zero the value first and set the used member.
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103
demo.c
103
demo.c
@ -21,15 +21,20 @@ void reset(void) { _tt = clock(); }
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unsigned long long rdtsc(void) { return clock() - _tt; }
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#endif
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void draw(mp_int *a)
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void ndraw(mp_int *a, char *name)
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{
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char buf[4096];
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printf("a->used == %d\na->alloc == %d\na->sign == %d\n", a->used, a->alloc, a->sign);
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printf("%s: ", name);
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mp_toradix(a, buf, 10);
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printf("num == %s\n", buf);
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printf("\n");
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printf("%s\n", buf);
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}
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static void draw(mp_int *a)
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{
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ndraw(a, "");
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}
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unsigned long lfsr = 0xAAAAAAAAUL;
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int lbit(void)
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@ -43,7 +48,18 @@ int lbit(void)
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}
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}
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#ifdef U_MPI
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int mp_reduce_setup(mp_int *a, mp_int *b)
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{
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int res;
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mp_set(a, 1);
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if ((res = s_mp_lshd(a, b->used * 2)) != MP_OKAY) {
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return res;
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}
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return mp_div(a, b, a, NULL);
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}
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#endif
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int main(void)
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{
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@ -51,7 +67,6 @@ int main(void)
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unsigned long expt_n, add_n, sub_n, mul_n, div_n, sqr_n, mul2d_n, div2d_n, gcd_n, lcm_n, inv_n;
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unsigned char cmd[4096], buf[4096];
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int rr;
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mp_digit tom;
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#ifdef TIMER
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int n;
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@ -63,35 +78,63 @@ int main(void)
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mp_init(&c);
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mp_init(&d);
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mp_init(&e);
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mp_init(&f);
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mp_init(&f);
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mp_read_radix(&a, "-2", 10);
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mp_read_radix(&b, "2", 10);
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mp_expt_d(&a, 3, &a);
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draw(&a);
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mp_read_radix(&a, "V//////////////////////////////////////////////////////////////////////////////////////", 64);
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mp_reduce_setup(&b, &a);
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printf("\n\n----\n\n");
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mp_toradix(&b, buf, 10);
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printf("b == %s\n\n\n", buf);
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mp_read_radix(&b, "4982748972349724892742", 10);
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mp_sub_d(&a, 1, &c);
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mp_exptmod(&b, &c, &a, &d);
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mp_toradix(&d, buf, 10);
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printf("b^p-1 == %s\n", buf);
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#ifdef TIMER
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mp_read_radix(&a, "340282366920938463463374607431768211455", 10);
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mp_read_radix(&b, "234892374891378913789237289378973232333", 10);
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while (a.used * DIGIT_BIT < 8192) {
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reset();
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for (rr = 0; rr < 100000; rr++) {
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for (rr = 0; rr < 1000; rr++) {
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mp_invmod(&b, &a, &c);
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}
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tt = rdtsc();
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mp_mulmod(&b, &c, &a, &d);
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if (mp_cmp_d(&d, 1) != MP_EQ) {
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printf("Failed to invert\n");
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return 0;
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}
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printf("Inverting mod %d-bit took %llu cycles\n", mp_count_bits(&a), tt / ((unsigned long long)1000));
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mp_sqr(&a, &a);
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mp_sqr(&b, &b);
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}
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mp_read_radix(&a, "340282366920938463463374607431768211455", 10);
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while (a.used * DIGIT_BIT < 8192) {
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reset();
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for (rr = 0; rr < 1000000; rr++) {
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mp_mul(&a, &a, &b);
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}
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tt = rdtsc();
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printf("Multiplying %d-bit took %llu cycles\n", mp_count_bits(&a), tt / ((unsigned long long)100000));
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printf("Multiplying %d-bit took %llu cycles\n", mp_count_bits(&a), tt / ((unsigned long long)1000000));
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mp_copy(&b, &a);
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}
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mp_read_radix(&a, "340282366920938463463374607431768211455", 10);
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while (a.used * DIGIT_BIT < 8192) {
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reset();
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for (rr = 0; rr < 100000; rr++) {
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for (rr = 0; rr < 1000000; rr++) {
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mp_sqr(&a, &b);
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}
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tt = rdtsc();
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printf("Squaring %d-bit took %llu cycles\n", mp_count_bits(&a), tt / ((unsigned long long)100000));
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printf("Squaring %d-bit took %llu cycles\n", mp_count_bits(&a), tt / ((unsigned long long)1000000));
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mp_copy(&b, &a);
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}
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@ -117,7 +160,7 @@ int main(void)
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mp_mod(&b, &c, &b);
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mp_set(&c, 3);
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reset();
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for (rr = 0; rr < 35; rr++) {
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for (rr = 0; rr < 50; rr++) {
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mp_exptmod(&c, &b, &a, &d);
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}
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tt = rdtsc();
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@ -130,7 +173,7 @@ int main(void)
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draw(&d);
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exit(0);
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}
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printf("Exponentiating %d-bit took %llu cycles\n", mp_count_bits(&a), tt / ((unsigned long long)35));
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printf("Exponentiating %d-bit took %llu cycles\n", mp_count_bits(&a), tt / ((unsigned long long)50));
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}
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}
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@ -141,7 +184,7 @@ int main(void)
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printf("%7lu/%7lu/%7lu/%7lu/%7lu/%7lu/%7lu/%7lu/%7lu/%7lu/%7lu\r", add_n, sub_n, mul_n, div_n, sqr_n, mul2d_n, div2d_n, gcd_n, lcm_n, expt_n, inv_n);
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fgets(cmd, 4095, stdin);
|
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cmd[strlen(cmd)-1] = 0;
|
||||
printf("%s ]\r",cmd);
|
||||
printf("%s ]\r",cmd); fflush(stdout);
|
||||
if (!strcmp(cmd, "mul2d")) { ++mul2d_n;
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&a, buf, 10);
|
||||
fgets(buf, 4095, stdin); sscanf(buf, "%d", &rr);
|
||||
@ -173,7 +216,8 @@ int main(void)
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&a, buf, 10);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&b, buf, 10);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&c, buf, 10);
|
||||
mp_add(&a, &b, &d);
|
||||
mp_copy(&a, &d);
|
||||
mp_add(&d, &b, &d);
|
||||
if (mp_cmp(&c, &d) != MP_EQ) {
|
||||
printf("add %lu failure!\n", add_n);
|
||||
draw(&a);draw(&b);draw(&c);draw(&d);
|
||||
@ -204,13 +248,13 @@ draw(&a);draw(&b);draw(&c);draw(&d);
|
||||
draw(&d);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
|
||||
} else if (!strcmp(cmd, "sub")) { ++sub_n;
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&a, buf, 10);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&b, buf, 10);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&c, buf, 10);
|
||||
mp_sub(&a, &b, &d);
|
||||
mp_copy(&a, &d);
|
||||
mp_sub(&d, &b, &d);
|
||||
if (mp_cmp(&c, &d) != MP_EQ) {
|
||||
printf("sub %lu failure!\n", sub_n);
|
||||
draw(&a);draw(&b);draw(&c);draw(&d);
|
||||
@ -220,7 +264,8 @@ draw(&a);draw(&b);draw(&c);draw(&d);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&a, buf, 10);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&b, buf, 10);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&c, buf, 10);
|
||||
mp_mul(&a, &b, &d);
|
||||
mp_copy(&a, &d);
|
||||
mp_mul(&d, &b, &d);
|
||||
if (mp_cmp(&c, &d) != MP_EQ) {
|
||||
printf("mul %lu failure!\n", mul_n);
|
||||
draw(&a);draw(&b);draw(&c);draw(&d);
|
||||
@ -242,7 +287,8 @@ draw(&a);draw(&b);draw(&c);draw(&d); draw(&e); draw(&f);
|
||||
} else if (!strcmp(cmd, "sqr")) { ++sqr_n;
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&a, buf, 10);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&b, buf, 10);
|
||||
mp_sqr(&a, &c);
|
||||
mp_copy(&a, &c);
|
||||
mp_sqr(&c, &c);
|
||||
if (mp_cmp(&b, &c) != MP_EQ) {
|
||||
printf("sqr %lu failure!\n", sqr_n);
|
||||
draw(&a);draw(&b);draw(&c);
|
||||
@ -252,7 +298,8 @@ draw(&a);draw(&b);draw(&c);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&a, buf, 10);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&b, buf, 10);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&c, buf, 10);
|
||||
mp_gcd(&a, &b, &d);
|
||||
mp_copy(&a, &d);
|
||||
mp_gcd(&d, &b, &d);
|
||||
d.sign = c.sign;
|
||||
if (mp_cmp(&c, &d) != MP_EQ) {
|
||||
printf("gcd %lu failure!\n", gcd_n);
|
||||
@ -263,7 +310,8 @@ draw(&a);draw(&b);draw(&c);draw(&d);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&a, buf, 10);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&b, buf, 10);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&c, buf, 10);
|
||||
mp_lcm(&a, &b, &d);
|
||||
mp_copy(&a, &d);
|
||||
mp_lcm(&d, &b, &d);
|
||||
d.sign = c.sign;
|
||||
if (mp_cmp(&c, &d) != MP_EQ) {
|
||||
printf("lcm %lu failure!\n", lcm_n);
|
||||
@ -275,7 +323,8 @@ draw(&a);draw(&b);draw(&c);draw(&d);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&b, buf, 10);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&c, buf, 10);
|
||||
fgets(buf, 4095, stdin); mp_read_radix(&d, buf, 10);
|
||||
mp_exptmod(&a, &b, &c, &e);
|
||||
mp_copy(&a, &e);
|
||||
mp_exptmod(&e, &b, &c, &e);
|
||||
if (mp_cmp(&d, &e) != MP_EQ) {
|
||||
printf("expt %lu failure!\n", expt_n);
|
||||
draw(&a);draw(&b);draw(&c);draw(&d); draw(&e);
|
||||
|
||||
4
makefile
4
makefile
@ -1,7 +1,7 @@
|
||||
CC = gcc
|
||||
CFLAGS += -Wall -W -O3 -funroll-loops
|
||||
CFLAGS += -DDEBUG -Wall -W -Os
|
||||
|
||||
VERSION=0.03
|
||||
VERSION=0.04
|
||||
|
||||
default: test
|
||||
|
||||
|
||||
@ -41,7 +41,7 @@ void rand_num(mp_int *a)
|
||||
unsigned char buf[512];
|
||||
|
||||
top:
|
||||
size = 1 + (fgetc(rng) % 96);
|
||||
size = 1 + ((fgetc(rng)*fgetc(rng)) % 32);
|
||||
buf[0] = (fgetc(rng)&1)?1:0;
|
||||
fread(buf+1, 1, size, rng);
|
||||
for (n = 0; n < size; n++) {
|
||||
@ -57,7 +57,7 @@ void rand_num2(mp_int *a)
|
||||
unsigned char buf[512];
|
||||
|
||||
top:
|
||||
size = 1 + (fgetc(rng) % 128);
|
||||
size = 1 + ((fgetc(rng)*fgetc(rng)) % 32);
|
||||
buf[0] = (fgetc(rng)&1)?1:0;
|
||||
fread(buf+1, 1, size, rng);
|
||||
for (n = 0; n < size; n++) {
|
||||
@ -196,7 +196,7 @@ int main(void)
|
||||
mp_todecimal(&c, buf);
|
||||
printf("%s\n", buf);
|
||||
} else if (n == 9) {
|
||||
/* lcm test */
|
||||
/* exptmod test */
|
||||
rand_num2(&a);
|
||||
rand_num2(&b);
|
||||
rand_num2(&c);
|
||||
@ -216,8 +216,10 @@ int main(void)
|
||||
rand_num2(&a);
|
||||
rand_num2(&b);
|
||||
b.sign = MP_ZPOS;
|
||||
a.sign = MP_ZPOS;
|
||||
mp_gcd(&a, &b, &c);
|
||||
if (mp_cmp_d(&c, 1) != 0) continue;
|
||||
if (mp_cmp_d(&b, 1) == 0) continue;
|
||||
mp_invmod(&a, &b, &c);
|
||||
printf("invmod\n");
|
||||
mp_todecimal(&a, buf);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user