CvStrongRng::CvStrongRng(CSRNG_TYPE type)
{
const int size = ( AES_SECURITY/sizeof(mr_small) );
String random;
char seed[size];
#ifdef WIN32
if ( m_bEnableEntropy )
{
CvEntropyServer( m_aEntropyServerUrl ).Generate( CvEntropyServer::StringToAlgorithm( m_aEntropyAlgorithm ),
CvEntropyServer::enEncoding_Raw,
size, random );
memcpy((void*)seed, (void*)random.data(), size);
}
#elif defined __linux__
FILE* fdRandom;
if ( m_bEnableEntropy )
{
CvEntropyServer( m_aEntropyServerUrl ).Generate( CvEntropyServer::StringToAlgorithm( m_aEntropyAlgorithm ),
CvEntropyServer::enEncoding_Raw,
size, random );
fdRandom = fmemopen( (void*)random.data(), size, "r" );
}
else
{
fdRandom = fopen( "/dev/urandom", "r" );
}
if ( fdRandom == NULL )
{
mr_berror( _MIPP_ MR_ERR_DEV_RANDOM );
}
for ( int i = 0; i < size; ++i )
{
int c = fgetc( fdRandom );
seed[i] = c;
if ( c == -1 )
{
mr_berror( _MIPP_ MR_ERR_DEV_RANDOM );
}
}
if ( fdRandom != NULL )
{
fclose( fdRandom );
}
#endif
time_t tod;
time( &tod );
strong_init( &m_csprng, size, seed, tod );
}
void mr_psub(_MIPD_ big x,big y,big z)
{ /* subtract two big numbers z=x-y *
* where x and y are positive and x>y */
int i,lx,ly;
mr_small borrow,pdiff;
mr_small *gx,*gy,*gz;
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
lx = (int)x->len;
ly = (int)y->len;
if (ly>lx)
{
mr_berror(_MIPP_ MR_ERR_NEG_RESULT);
return;
}
if (y!=z) copy(x,z);
else ly=lx;
z->len=lx;
gx=x->w; gy=y->w; gz=z->w;
borrow=0;
#ifndef MR_SIMPLE_BASE
if (mr_mip->base==0)
{
#endif
for (i=0;i<ly || borrow>0;i++)
{ /* subtract by columns */
if (i>lx)
{
mr_berror(_MIPP_ MR_ERR_NEG_RESULT);
return;
}
pdiff=gx[i]-gy[i]-borrow;
if (pdiff<gx[i]) borrow=0;
else if (pdiff>gx[i]) borrow=1;
gz[i]=pdiff;
}
#ifndef MR_SIMPLE_BASE
}
else for (i=0;i<ly || borrow>0;i++)
{ /* subtract by columns */
if (i>lx)
{
mr_berror(_MIPP_ MR_ERR_NEG_RESULT);
return;
}
pdiff=gy[i]+borrow;
borrow=0;
if (gx[i]>=pdiff) pdiff=gx[i]-pdiff;
else
{ /* set borrow */
pdiff=mr_mip->base+gx[i]-pdiff;
borrow=1;
}
gz[i]=pdiff;
}
#endif
mr_lzero(z);
}
mr_small prepare_monty(_MIPD_ big n)
{ /* prepare Montgomery modulus */
#ifdef MR_KCM
int nl;
#endif
#ifdef MR_PENTIUM
mr_small ndash;
mr_small base;
mr_small magic=13835058055282163712.0;
int control=0x1FFF;
#endif
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
if (mr_mip->ERNUM) return (mr_small)0;
/* Is it set-up already? */
if (size(mr_mip->modulus)!=0)
if (mr_compare(n,mr_mip->modulus)==0) return mr_mip->ndash;
MR_IN(80)
if (size(n)<=2)
{
mr_berror(_MIPP_ MR_ERR_BAD_MODULUS);
MR_OUT
return (mr_small)0;
}
BOOL ebrick_init(_MIPD_ ebrick *B,big x,big y,big a,big b,big n,int window,int nb)
{ /* Uses Montgomery arithmetic internally *
* (x,y) is the fixed base *
* a,b and n are parameters and modulus of the curve *
* window is the window size in bits and *
* nb is the maximum number of bits in the multiplier */
int i,j,k,t,bp,len,bptr,is;
epoint **table;
epoint *w;
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
if (nb<2 || window<1 || window>nb || mr_mip->ERNUM) return FALSE;
t=MR_ROUNDUP(nb,window);
if (t<2) return FALSE;
MR_IN(115)
#ifndef MR_ALWAYS_BINARY
if (mr_mip->base != mr_mip->base2)
{
mr_berror(_MIPP_ MR_ERR_NOT_SUPPORTED);
MR_OUT
return FALSE;
}
void fexp(_MIPD_ flash x,flash y)
{ /* calculates y=exp(x) */
int i,n,nsq,m,sqrn,op[5];
BOOL minus,rem;
#ifndef MR_GENERIC_MT
miracl *mr_mip=get_mip();
#endif
if (mr_mip->ERNUM) return;
if (size(x)==0)
{
convert(_MIPP_ 1,y);
return;
}
copy(x,y);
MR_IN(54)
minus=FALSE;
if (size(y)<0)
{
minus=TRUE;
negate(y,y);
}
ftrunc(_MIPP_ y,y,mr_mip->w9);
n=size(y);
if (n==MR_TOOBIG)
{
mr_berror(_MIPP_ MR_ERR_FLASH_OVERFLOW);
MR_OUT
return;
}
BOOL froot(_MIPD_ flash x,int n,flash w)
{ /* extract nth root of x - w=x^(1/n) using Newtons method */
BOOL minus,rn,rm,hack;
int nm,dn,s,op[5];
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
copy(x,w);
if (mr_mip->ERNUM || n==1) return TRUE;
if (n==(-1))
{
frecip(_MIPP_ w,w);
return TRUE;
}
MR_IN(52)
minus=FALSE;
if (n<0)
{
minus=TRUE;
n=(-n);
}
s=exsign(w);
if (n%2==0 && s==MINUS)
{
mr_berror(_MIPP_ MR_ERR_NEG_ROOT);
MR_OUT
return FALSE;
}
BOOL brick_init(_MIPD_ brick *b,big g,big n,int window,int nb)
{ /* Uses Montgomery arithmetic internally *
* g is the fixed base for exponentiation *
* n is the fixed modulus *
* nb is the maximum number of bits in the exponent */
int i,j,k,t,bp,len,bptr;
big *table;
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
if (nb<2 || window<1 || window>nb || mr_mip->ERNUM) return FALSE;
t=MR_ROUNDUP(nb,window);
if (t<2) return FALSE;
MR_IN(109)
#ifndef MR_ALWAYS_BINARY
if (mr_mip->base != mr_mip->base2)
{
mr_berror(_MIPP_ MR_ERR_NOT_SUPPORTED);
MR_OUT
return FALSE;
}
BOOL double_inverse(_MIPD_ big n,big x,big y,big w,big z)
{
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
MR_IN(146)
mad(_MIPP_ x,w,w,n,n,mr_mip->w6);
if (size(mr_mip->w6)==0)
{
mr_berror(_MIPP_ MR_ERR_DIV_BY_ZERO);
MR_OUT
return FALSE;
}
void strong_bigdig(_MIPD_ csprng *rng,int n,int b,big x)
{ /* generate random number n digits long *
* to "printable" base b */
#ifndef MR_GENERIC_MT
miracl *mr_mip=get_mip();
#endif
if (mr_mip->ERNUM) return;
MR_IN(19)
if (b<2 || b>256)
{
mr_berror(_MIPP_ MR_ERR_BASE_TOO_BIG);
MR_OUT
return;
}
flash mirvar(_MIPD_ int iv)
{ /* initialize big/flash number */
flash x;
int align;
char *ptr;
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
if (mr_mip->ERNUM) return NULL;
MR_IN(23);
if (!(mr_mip->active))
{
mr_berror(_MIPP_ MR_ERR_NO_MIRSYS);
MR_OUT
return NULL;
}
BOOL multi_inverse(_MIPD_ int m,big *x,big n,big *w)
{ /* find w[i]=1/x[i] mod n, for i=0 to m-1 *
* x and w MUST be distinct */
int i;
#ifndef MR_GENERIC_MT
miracl *mr_mip=get_mip();
#endif
if (m==0) return TRUE;
if (m<0) return FALSE;
MR_IN(25)
if (x==w)
{
mr_berror(_MIPP_ MR_ERR_BAD_PARAMETERS);
MR_OUT
return FALSE;
}
BOOL crt_init(_MIPD_ big_chinese *c,int r,big *moduli)
{ /* calculate CRT constants */
int i,j,k;
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
if (r<2 || mr_mip->ERNUM) return FALSE;
for (i=0;i<r;i++) if (size(moduli[i])<2) return FALSE;
MR_IN(73)
c->M=(big *)mr_alloc(_MIPP_ r,sizeof(big));
if (c->M==NULL)
{
mr_berror(_MIPP_ MR_ERR_OUT_OF_MEMORY);
MR_OUT
return FALSE;
}
void expint(_MIPD_ int b,int n,big x)
{ /* sets x=b^n */
unsigned int bit,un;
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
if (mr_mip->ERNUM) return;
convert(_MIPP_ 1,x);
if (n==0) return;
MR_IN(50)
if (n<0)
{
mr_berror(_MIPP_ MR_ERR_NEG_POWER);
MR_OUT
return;
}
void *mr_alloc(_MIPD_ int num,int size)
{
char *p;
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
if (mr_mip==NULL)
{
p=(char *)calloc(num,size);
return (void *)p;
}
if (mr_mip->ERNUM) return NULL;
p=(char *)calloc(num,size);
if (p==NULL) mr_berror(_MIPP_ MR_ERR_OUT_OF_MEMORY);
return (void *)p;
}
double fdsize(_MIPD_ flash w)
{ /* express flash number as double. */
int i,s,en,ed;
double n,d,b,BIGGEST;
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
if (mr_mip->ERNUM || size(w)==0) return (0.0);
MR_IN(11)
BIGGEST=pow(2.0,(double)(1<<(MR_EBITS-4)));
mr_mip->EXACT=FALSE;
n=0.0;
d=0.0;
if (mr_mip->base==0) b=pow(2.0,(double)MIRACL);
else b=(double)mr_mip->base;
numer(_MIPP_ w,mr_mip->w1);
s=exsign(mr_mip->w1);
insign(PLUS,mr_mip->w1);
en=(int)mr_mip->w1->len;
for (i=0;i<en;i++)
n=(double)mr_mip->w1->w[i]+(n/b);
denom(_MIPP_ w,mr_mip->w1);
ed=(int)mr_mip->w1->len;
for (i=0;i<ed;i++)
d=(double)mr_mip->w1->w[i]+(d/b);
n/=d;
while (en!=ed)
{
if (en>ed)
{
ed++;
if (BIGGEST/b<n)
{
mr_berror(_MIPP_ MR_ERR_DOUBLE_FAIL);
MR_OUT
return (0.0);
}
n*=b;
}
void mround(_MIPD_ big num,big den,flash z)
{ /* reduces and rounds the fraction num/den into z */
int s;
#ifndef MR_GENERIC_MT
miracl *mr_mip=get_mip();
#endif
if (mr_mip->ERNUM) return;
if (size(num)==0)
{
zero(z);
return;
}
MR_IN(34)
if (size(den)==0)
{
mr_berror(_MIPP_ MR_ERR_FLASH_OVERFLOW);
MR_OUT
return;
}
void expb2(_MIPD_ int n,big x)
{ /* sets x=2^n */
int r,p;
#ifndef MR_ALWAYS_BINARY
int i;
#endif
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
if (mr_mip->ERNUM) return;
convert(_MIPP_ 1,x);
if (n==0) return;
MR_IN(149)
if (n<0)
{
mr_berror(_MIPP_ MR_ERR_NEG_POWER);
MR_OUT
return;
}
int instr(_MIPD_ flash x,char *string)
{ /* input a big number *
* returns length in digits */
int i,ipt,n,s,e;
int ch;
#ifdef MR_FLASH
BOOL frac;
#endif
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
if (mr_mip->ERNUM) return 0;
MR_IN(76)
if (mr_mip->apbase==0 || mr_mip->apbase>256)
{
mr_berror(_MIPP_ MR_ERR_BASE_TOO_BIG);
MR_OUT
return 0;
}
void gprime(_MIPD_ int maxp)
{ /* generate all primes less than maxp into global PRIMES */
char *sv;
int pix,i,k,prime;
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
if (mr_mip->ERNUM) return;
if (maxp<=0)
{
if (mr_mip->PRIMES!=NULL) mr_free(mr_mip->PRIMES);
mr_mip->PRIMES=NULL;
return;
}
MR_IN(70)
if (maxp>=MR_TOOBIG)
{
mr_berror(_MIPP_ MR_ERR_TOO_BIG);
MR_OUT
return;
}
static void mr_select(_MIPD_ big x,int d,big y,big z)
{ /* perform required add or subtract operation */
int sx,sy,sz,jf,xgty;
#ifdef MR_FLASH
if (mr_notint(x) || mr_notint(y))
{
mr_berror(_MIPP_ MR_ERR_INT_OP);
return;
}
#endif
sx=exsign(x);
sy=exsign(y);
sz=0;
x->len&=MR_OBITS; /* force operands to be positive */
y->len&=MR_OBITS;
xgty=mr_compare(x,y);
jf=(1+sx)+(1+d*sy)/2;
switch (jf)
{ /* branch according to signs of operands */
case 0:
if (xgty>=0)
mr_padd(_MIPP_ x,y,z);
else
mr_padd(_MIPP_ y,x,z);
sz=MINUS;
break;
case 1:
if (xgty<=0)
{
mr_psub(_MIPP_ y,x,z);
sz=PLUS;
}
else
{
mr_psub(_MIPP_ x,y,z);
sz=MINUS;
}
break;
case 2:
if (xgty>=0)
{
mr_psub(_MIPP_ x,y,z);
sz=PLUS;
}
else
{
mr_psub(_MIPP_ y,x,z);
sz=MINUS;
}
break;
case 3:
if (xgty>=0)
mr_padd(_MIPP_ x,y,z);
else
mr_padd(_MIPP_ y,x,z);
sz=PLUS;
break;
}
if (sz<0) z->len^=MR_MSBIT; /* set sign of result */
if (x!=z && sx<0) x->len^=MR_MSBIT; /* restore signs to operands */
if (y!=z && y!=x && sy<0) y->len^=MR_MSBIT;
}
void mr_padd(_MIPD_ big x,big y,big z)
{ /* add two big numbers, z=x+y where *
* x and y are positive */
int i,lx,ly,lz,la;
mr_small carry,psum;
mr_small *gx,*gy,*gz;
#ifdef MR_OS_THREADS
miracl *mr_mip=get_mip();
#endif
lx = (int)x->len;
ly = (int)y->len;
if (ly>lx)
{
lz=ly;
la=lx;
if (x!=z) copy(y,z);
else la=ly;
}
else
{
lz=lx;
la=ly;
if (y!=z) copy(x,z);
else la=lx;
}
carry=0;
z->len=lz;
gx=x->w; gy=y->w; gz=z->w;
if (lz<mr_mip->nib || !mr_mip->check) z->len++;
#ifndef MR_SIMPLE_BASE
if (mr_mip->base==0)
{
#endif
for (i=0;i<la;i++)
{ /* add by columns to length of the smaller number */
psum=gx[i]+gy[i]+carry;
if (psum>gx[i]) carry=0;
else if (psum<gx[i]) carry=1;
gz[i]=psum;
}
for (;i<lz && carry>0;i++ )
{ /* add by columns to the length of larger number (if there is a carry) */
psum=gx[i]+gy[i]+carry;
if (psum>gx[i]) carry=0;
else if (psum<gx[i]) carry=1;
gz[i]=psum;
}
if (carry)
{ /* carry left over - possible overflow */
if (mr_mip->check && i>=mr_mip->nib)
{
mr_berror(_MIPP_ MR_ERR_OVERFLOW);
return;
}
gz[i]=carry;
}
#ifndef MR_SIMPLE_BASE
}
else
{
for (i=0;i<la;i++)
{ /* add by columns */
psum=gx[i]+gy[i]+carry;
carry=0;
if (psum>=mr_mip->base)
{ /* set carry */
carry=1;
psum-=mr_mip->base;
}
gz[i]=psum;
}
for (;i<lz && carry>0;i++)
{
psum=gx[i]+gy[i]+carry;
carry=0;
if (psum>=mr_mip->base)
{ /* set carry */
carry=1;
psum-=mr_mip->base;
}
gz[i]=psum;
}
if (carry)
{ /* carry left over - possible overflow */
if (mr_mip->check && i>=mr_mip->nib)
{
mr_berror(_MIPP_ MR_ERR_OVERFLOW);
return;
}
gz[i]=carry;
}
}
#endif
if (gz[z->len-1]==0) z->len--;
}
