30 lines
455 B
C
30 lines
455 B
C
#include "os.h"
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#include <mp.h>
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#include "dat.h"
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// convert a little endian byte array (least significant byte first) to an mpint
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mpint*
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letomp(uchar *s, uint n, mpint *b)
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{
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int i=0, m = 0;
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mpdigit x=0;
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if(b == nil)
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b = mpnew(0);
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mpbits(b, 8*n);
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b->top = DIGITS(8*n);
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for(; n > 0; n--){
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x |= ((mpdigit)(*s++)) << i;
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i += 8;
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if(i == Dbits){
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b->p[m++] = x;
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i = 0;
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x = 0;
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}
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}
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if(i > 0)
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b->p[m++] = x;
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b->top = m;
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return b;
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}
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