# code: drawterm

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```#include "os.h"

#include <libsec.h>

#define BYTES_TO_DWORD(strptr)                    \
(((u32int) *((strptr)+3) << 24) | \
((u32int) *((strptr)+2) << 16) | \
((u32int) *((strptr)+1) <<  8) | \
((u32int) *(strptr)))

#define ROL(x, n)        (((x) << (n)) | ((x) >> (32-(n))))

/* the five basic functions F(), G() and H() */
#define F(x, y, z)        ((x) ^ (y) ^ (z))
#define G(x, y, z)        (((x) & (y)) | (~(x) & (z)))
#define H(x, y, z)        (((x) | ~(y)) ^ (z))
#define I(x, y, z)        (((x) & (z)) | ((y) & ~(z)))
#define J(x, y, z)        ((x) ^ ((y) | ~(z)))

/* the ten basic operations FF() through III() */
#define FF(a, b, c, d, e, x, s)        {\
(a) += F((b), (c), (d)) + (x);\
(a) = ROL((a), (s)) + (e);\
(c) = ROL((c), 10);\
}
#define GG(a, b, c, d, e, x, s)        {\
(a) += G((b), (c), (d)) + (x) + 0x5a827999UL;\
(a) = ROL((a), (s)) + (e);\
(c) = ROL((c), 10);\
}
#define HH(a, b, c, d, e, x, s)        {\
(a) += H((b), (c), (d)) + (x) + 0x6ed9eba1UL;\
(a) = ROL((a), (s)) + (e);\
(c) = ROL((c), 10);\
}
#define II(a, b, c, d, e, x, s)        {\
(a) += I((b), (c), (d)) + (x) + 0x8f1bbcdcUL;\
(a) = ROL((a), (s)) + (e);\
(c) = ROL((c), 10);\
}
#define JJ(a, b, c, d, e, x, s)        {\
(a) += J((b), (c), (d)) + (x) + 0xa953fd4eUL;\
(a) = ROL((a), (s)) + (e);\
(c) = ROL((c), 10);\
}
#define FFF(a, b, c, d, e, x, s)        {\
(a) += F((b), (c), (d)) + (x);\
(a) = ROL((a), (s)) + (e);\
(c) = ROL((c), 10);\
}
#define GGG(a, b, c, d, e, x, s)        {\
(a) += G((b), (c), (d)) + (x) + 0x7a6d76e9UL;\
(a) = ROL((a), (s)) + (e);\
(c) = ROL((c), 10);\
}
#define HHH(a, b, c, d, e, x, s)        {\
(a) += H((b), (c), (d)) + (x) + 0x6d703ef3UL;\
(a) = ROL((a), (s)) + (e);\
(c) = ROL((c), 10);\
}
#define III(a, b, c, d, e, x, s)        {\
(a) += I((b), (c), (d)) + (x) + 0x5c4dd124UL;\
(a) = ROL((a), (s)) + (e);\
(c) = ROL((c), 10);\
}
#define JJJ(a, b, c, d, e, x, s)        {\
(a) += J((b), (c), (d)) + (x) + 0x50a28be6UL;\
(a) = ROL((a), (s)) + (e);\
(c) = ROL((c), 10);\
}

static void MDinit(u32int *MDbuf)
{
MDbuf[0] = 0x67452301UL;
MDbuf[1] = 0xefcdab89UL;
MDbuf[3] = 0x10325476UL;
MDbuf[4] = 0xc3d2e1f0UL;

return;
}

static void compress(u32int *MDbuf, u32int *X)
{
u32int aa = MDbuf[0],  bb = MDbuf[1],  cc = MDbuf[2],
dd = MDbuf[3],  ee = MDbuf[4];
u32int aaa = MDbuf[0], bbb = MDbuf[1], ccc = MDbuf[2],
ddd = MDbuf[3], eee = MDbuf[4];

/* round 1 */
FF(aa, bb, cc, dd, ee, X[ 0], 11);
FF(ee, aa, bb, cc, dd, X[ 1], 14);
FF(dd, ee, aa, bb, cc, X[ 2], 15);
FF(cc, dd, ee, aa, bb, X[ 3], 12);
FF(bb, cc, dd, ee, aa, X[ 4],  5);
FF(aa, bb, cc, dd, ee, X[ 5],  8);
FF(ee, aa, bb, cc, dd, X[ 6],  7);
FF(dd, ee, aa, bb, cc, X[ 7],  9);
FF(cc, dd, ee, aa, bb, X[ 8], 11);
FF(bb, cc, dd, ee, aa, X[ 9], 13);
FF(aa, bb, cc, dd, ee, X[10], 14);
FF(ee, aa, bb, cc, dd, X[11], 15);
FF(dd, ee, aa, bb, cc, X[12],  6);
FF(cc, dd, ee, aa, bb, X[13],  7);
FF(bb, cc, dd, ee, aa, X[14],  9);
FF(aa, bb, cc, dd, ee, X[15],  8);

/* round 2 */
GG(ee, aa, bb, cc, dd, X[ 7],  7);
GG(dd, ee, aa, bb, cc, X[ 4],  6);
GG(cc, dd, ee, aa, bb, X[13],  8);
GG(bb, cc, dd, ee, aa, X[ 1], 13);
GG(aa, bb, cc, dd, ee, X[10], 11);
GG(ee, aa, bb, cc, dd, X[ 6],  9);
GG(dd, ee, aa, bb, cc, X[15],  7);
GG(cc, dd, ee, aa, bb, X[ 3], 15);
GG(bb, cc, dd, ee, aa, X[12],  7);
GG(aa, bb, cc, dd, ee, X[ 0], 12);
GG(ee, aa, bb, cc, dd, X[ 9], 15);
GG(dd, ee, aa, bb, cc, X[ 5],  9);
GG(cc, dd, ee, aa, bb, X[ 2], 11);
GG(bb, cc, dd, ee, aa, X[14],  7);
GG(aa, bb, cc, dd, ee, X[11], 13);
GG(ee, aa, bb, cc, dd, X[ 8], 12);

/* round 3 */
HH(dd, ee, aa, bb, cc, X[ 3], 11);
HH(cc, dd, ee, aa, bb, X[10], 13);
HH(bb, cc, dd, ee, aa, X[14],  6);
HH(aa, bb, cc, dd, ee, X[ 4],  7);
HH(ee, aa, bb, cc, dd, X[ 9], 14);
HH(dd, ee, aa, bb, cc, X[15],  9);
HH(cc, dd, ee, aa, bb, X[ 8], 13);
HH(bb, cc, dd, ee, aa, X[ 1], 15);
HH(aa, bb, cc, dd, ee, X[ 2], 14);
HH(ee, aa, bb, cc, dd, X[ 7],  8);
HH(dd, ee, aa, bb, cc, X[ 0], 13);
HH(cc, dd, ee, aa, bb, X[ 6],  6);
HH(bb, cc, dd, ee, aa, X[13],  5);
HH(aa, bb, cc, dd, ee, X[11], 12);
HH(ee, aa, bb, cc, dd, X[ 5],  7);
HH(dd, ee, aa, bb, cc, X[12],  5);

/* round 4 */
II(cc, dd, ee, aa, bb, X[ 1], 11);
II(bb, cc, dd, ee, aa, X[ 9], 12);
II(aa, bb, cc, dd, ee, X[11], 14);
II(ee, aa, bb, cc, dd, X[10], 15);
II(dd, ee, aa, bb, cc, X[ 0], 14);
II(cc, dd, ee, aa, bb, X[ 8], 15);
II(bb, cc, dd, ee, aa, X[12],  9);
II(aa, bb, cc, dd, ee, X[ 4],  8);
II(ee, aa, bb, cc, dd, X[13],  9);
II(dd, ee, aa, bb, cc, X[ 3], 14);
II(cc, dd, ee, aa, bb, X[ 7],  5);
II(bb, cc, dd, ee, aa, X[15],  6);
II(aa, bb, cc, dd, ee, X[14],  8);
II(ee, aa, bb, cc, dd, X[ 5],  6);
II(dd, ee, aa, bb, cc, X[ 6],  5);
II(cc, dd, ee, aa, bb, X[ 2], 12);

/* round 5 */
JJ(bb, cc, dd, ee, aa, X[ 4],  9);
JJ(aa, bb, cc, dd, ee, X[ 0], 15);
JJ(ee, aa, bb, cc, dd, X[ 5],  5);
JJ(dd, ee, aa, bb, cc, X[ 9], 11);
JJ(cc, dd, ee, aa, bb, X[ 7],  6);
JJ(bb, cc, dd, ee, aa, X[12],  8);
JJ(aa, bb, cc, dd, ee, X[ 2], 13);
JJ(ee, aa, bb, cc, dd, X[10], 12);
JJ(dd, ee, aa, bb, cc, X[14],  5);
JJ(cc, dd, ee, aa, bb, X[ 1], 12);
JJ(bb, cc, dd, ee, aa, X[ 3], 13);
JJ(aa, bb, cc, dd, ee, X[ 8], 14);
JJ(ee, aa, bb, cc, dd, X[11], 11);
JJ(dd, ee, aa, bb, cc, X[ 6],  8);
JJ(cc, dd, ee, aa, bb, X[15],  5);
JJ(bb, cc, dd, ee, aa, X[13],  6);

/* parallel round 1 */
JJJ(aaa, bbb, ccc, ddd, eee, X[ 5],  8);
JJJ(eee, aaa, bbb, ccc, ddd, X[14],  9);
JJJ(ddd, eee, aaa, bbb, ccc, X[ 7],  9);
JJJ(ccc, ddd, eee, aaa, bbb, X[ 0], 11);
JJJ(bbb, ccc, ddd, eee, aaa, X[ 9], 13);
JJJ(aaa, bbb, ccc, ddd, eee, X[ 2], 15);
JJJ(eee, aaa, bbb, ccc, ddd, X[11], 15);
JJJ(ddd, eee, aaa, bbb, ccc, X[ 4],  5);
JJJ(ccc, ddd, eee, aaa, bbb, X[13],  7);
JJJ(bbb, ccc, ddd, eee, aaa, X[ 6],  7);
JJJ(aaa, bbb, ccc, ddd, eee, X[15],  8);
JJJ(eee, aaa, bbb, ccc, ddd, X[ 8], 11);
JJJ(ddd, eee, aaa, bbb, ccc, X[ 1], 14);
JJJ(ccc, ddd, eee, aaa, bbb, X[10], 14);
JJJ(bbb, ccc, ddd, eee, aaa, X[ 3], 12);
JJJ(aaa, bbb, ccc, ddd, eee, X[12],  6);

/* parallel round 2 */
III(eee, aaa, bbb, ccc, ddd, X[ 6],  9);
III(ddd, eee, aaa, bbb, ccc, X[11], 13);
III(ccc, ddd, eee, aaa, bbb, X[ 3], 15);
III(bbb, ccc, ddd, eee, aaa, X[ 7],  7);
III(aaa, bbb, ccc, ddd, eee, X[ 0], 12);
III(eee, aaa, bbb, ccc, ddd, X[13],  8);
III(ddd, eee, aaa, bbb, ccc, X[ 5],  9);
III(ccc, ddd, eee, aaa, bbb, X[10], 11);
III(bbb, ccc, ddd, eee, aaa, X[14],  7);
III(aaa, bbb, ccc, ddd, eee, X[15],  7);
III(eee, aaa, bbb, ccc, ddd, X[ 8], 12);
III(ddd, eee, aaa, bbb, ccc, X[12],  7);
III(ccc, ddd, eee, aaa, bbb, X[ 4],  6);
III(bbb, ccc, ddd, eee, aaa, X[ 9], 15);
III(aaa, bbb, ccc, ddd, eee, X[ 1], 13);
III(eee, aaa, bbb, ccc, ddd, X[ 2], 11);

/* parallel round 3 */
HHH(ddd, eee, aaa, bbb, ccc, X[15],  9);
HHH(ccc, ddd, eee, aaa, bbb, X[ 5],  7);
HHH(bbb, ccc, ddd, eee, aaa, X[ 1], 15);
HHH(aaa, bbb, ccc, ddd, eee, X[ 3], 11);
HHH(eee, aaa, bbb, ccc, ddd, X[ 7],  8);
HHH(ddd, eee, aaa, bbb, ccc, X[14],  6);
HHH(ccc, ddd, eee, aaa, bbb, X[ 6],  6);
HHH(bbb, ccc, ddd, eee, aaa, X[ 9], 14);
HHH(aaa, bbb, ccc, ddd, eee, X[11], 12);
HHH(eee, aaa, bbb, ccc, ddd, X[ 8], 13);
HHH(ddd, eee, aaa, bbb, ccc, X[12],  5);
HHH(ccc, ddd, eee, aaa, bbb, X[ 2], 14);
HHH(bbb, ccc, ddd, eee, aaa, X[10], 13);
HHH(aaa, bbb, ccc, ddd, eee, X[ 0], 13);
HHH(eee, aaa, bbb, ccc, ddd, X[ 4],  7);
HHH(ddd, eee, aaa, bbb, ccc, X[13],  5);

/* parallel round 4 */
GGG(ccc, ddd, eee, aaa, bbb, X[ 8], 15);
GGG(bbb, ccc, ddd, eee, aaa, X[ 6],  5);
GGG(aaa, bbb, ccc, ddd, eee, X[ 4],  8);
GGG(eee, aaa, bbb, ccc, ddd, X[ 1], 11);
GGG(ddd, eee, aaa, bbb, ccc, X[ 3], 14);
GGG(ccc, ddd, eee, aaa, bbb, X[11], 14);
GGG(bbb, ccc, ddd, eee, aaa, X[15],  6);
GGG(aaa, bbb, ccc, ddd, eee, X[ 0], 14);
GGG(eee, aaa, bbb, ccc, ddd, X[ 5],  6);
GGG(ddd, eee, aaa, bbb, ccc, X[12],  9);
GGG(ccc, ddd, eee, aaa, bbb, X[ 2], 12);
GGG(bbb, ccc, ddd, eee, aaa, X[13],  9);
GGG(aaa, bbb, ccc, ddd, eee, X[ 9], 12);
GGG(eee, aaa, bbb, ccc, ddd, X[ 7],  5);
GGG(ddd, eee, aaa, bbb, ccc, X[10], 15);
GGG(ccc, ddd, eee, aaa, bbb, X[14],  8);

/* parallel round 5 */
FFF(bbb, ccc, ddd, eee, aaa, X[12] ,  8);
FFF(aaa, bbb, ccc, ddd, eee, X[15] ,  5);
FFF(eee, aaa, bbb, ccc, ddd, X[10] , 12);
FFF(ddd, eee, aaa, bbb, ccc, X[ 4] ,  9);
FFF(ccc, ddd, eee, aaa, bbb, X[ 1] , 12);
FFF(bbb, ccc, ddd, eee, aaa, X[ 5] ,  5);
FFF(aaa, bbb, ccc, ddd, eee, X[ 8] , 14);
FFF(eee, aaa, bbb, ccc, ddd, X[ 7] ,  6);
FFF(ddd, eee, aaa, bbb, ccc, X[ 6] ,  8);
FFF(ccc, ddd, eee, aaa, bbb, X[ 2] , 13);
FFF(bbb, ccc, ddd, eee, aaa, X[13] ,  6);
FFF(aaa, bbb, ccc, ddd, eee, X[14] ,  5);
FFF(eee, aaa, bbb, ccc, ddd, X[ 0] , 15);
FFF(ddd, eee, aaa, bbb, ccc, X[ 3] , 13);
FFF(ccc, ddd, eee, aaa, bbb, X[ 9] , 11);
FFF(bbb, ccc, ddd, eee, aaa, X[11] , 11);

/* combine results */
ddd += cc + MDbuf[1];               /* final result for MDbuf[0] */
MDbuf[1] = MDbuf[2] + dd + eee;
MDbuf[2] = MDbuf[3] + ee + aaa;
MDbuf[3] = MDbuf[4] + aa + bbb;
MDbuf[4] = MDbuf[0] + bb + ccc;
MDbuf[0] = ddd;

return;
}

static void MDfinish(u32int *MDbuf, uchar *strptr, u32int lswlen, u32int mswlen)
{
unsigned int i;                                 /* counter       */
u32int        X[16];                             /* message words */

memset(X, 0, 16*sizeof(u32int));

/* put bytes from strptr into X */
for (i=0; i<(lswlen&63); i++) {
/* byte i goes into word X[i div 4] at pos.  8*(i mod 4)  */
X[i>>2] ^= (u32int) *strptr++ << (8 * (i&3));
}

/* append the bit m_n == 1 */
X[(lswlen>>2)&15] ^= (u32int)1 << (8*(lswlen&3) + 7);

if ((lswlen & 63) > 55) {
/* length goes to next block */
compress(MDbuf, X);
memset(X, 0, 16*sizeof(u32int));
}

/* append length in bits*/
X[14] = lswlen << 3;
X[15] = (lswlen >> 29) | (mswlen << 3);
compress(MDbuf, X);

return;
}

DigestState*
ripemd160(uchar *p, ulong len, uchar *digest, DigestState *s)
{
u32int x[16];
int i, j, k;

if(s == nil){
s = malloc(sizeof(*s));
if(s == nil)
return nil;
memset(s, 0, sizeof(*s));
s->malloced = 1;
}

if(s->seeded == 0){
MDinit(s->state);
s->seeded = 1;
}

/* fill out the partial 64 byte block from previous calls */
if(s->blen){
i = 64 - s->blen;
if(len < i)
i = len;
memmove(s->buf + s->blen, p, i);
len -= i;
s->blen += i;
p += i;
if(s->blen == 64){
for(i = 0; i < 16; i++)
x[i] = BYTES_TO_DWORD(s->buf + i * 4);
compress(s->state, x);
s->len += s->blen;
s->blen = 0;
}
}

/* do 64 byte blocks */
i = len & ~0x3f;
if(i){
for(j = 0; j < i; j += 64){
for(k = 0; k < 16; k++)
x[k] = BYTES_TO_DWORD(p + j + k * 4);
compress(s->state, x);
}
s->len += i;
len -= i;
p += i;
}

/* save the left overs if not last call */
if(digest == 0){
if(len){
memmove(s->buf, p, len);
s->blen += len;
}
return s;
}

MDfinish(s->state, p, s->len + len, 0);
for(i = 0; i < 5; i++){
digest[4 * i] = s->state[i];
digest[4 * i + 1] = s->state[i] >> 8;
digest[4 * i + 2] = s->state[i] >> 16;
digest[4 * i + 3] = s->state[i] >> 24;

}
if(s->malloced == 1)
free(s);
return nil;

}
```