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#include "os.h"
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#include <mp.h>
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#include "dat.h"
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// convert an mpint into a big endian byte array (most significant byte first; left adjusted)
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//   return number of bytes converted
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//   if p == nil, allocate and result array
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int
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mptobe(mpint *b, uchar *p, uint n, uchar **pp)
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{
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	int m;
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	m = (mpsignif(b)+7)/8;
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	if(m == 0)
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		m++;
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	if(p == nil){
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		n = m;
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		p = malloc(n);
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		if(p == nil)
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			sysfatal("mptobe: %r");
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		setmalloctag(p, getcallerpc(&b));
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	} else {
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		if(n < m)
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			return -1;
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		if(n > m)
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			memset(p+m, 0, n-m);
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	}
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	if(pp != nil)
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		*pp = p;
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	mptober(b, p, m);
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	return m;
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}