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Remove the last lingering knowledge, outside sshbn.c, of the

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internal structure of the Bignum type. Bignum is now a fully opaque
type unless you're inside sshbn.c.

[originally from svn r960]
This commit is contained in:
Simon Tatham
2001-03-01 17:41:26 +00:00
parent 7717c386a1
commit f72b5aa95f
7 changed files with 160 additions and 165 deletions
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51
sshdss.c
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@ -16,23 +16,6 @@
(cp)[3] = (unsigned char)(value); }
#if 0
/*
* Condition this section in for debugging of DSS.
*/
static void diagbn(char *prefix, Bignum md) {
int i, nibbles, morenibbles;
static const char hex[] = "0123456789ABCDEF";
printf("%s0x", prefix ? prefix : "");
nibbles = (3 + ssh1_bignum_bitcount(md))/4; if (nibbles<1) nibbles=1;
morenibbles = 4*md[0] - nibbles;
for (i=0; i<morenibbles; i++) putchar('-');
for (i=nibbles; i-- ;)
putchar(hex[(bignum_byte(md, i/2) >> (4*(i%2))) & 0xF]);
if (prefix) putchar('\n');
}
#define DEBUG_DSS
#else
#define diagbn(x,y)
@ -51,7 +34,7 @@ static void getstring(char **data, int *datalen, char **p, int *length) {
}
static Bignum getmp(char **data, int *datalen) {
char *p;
int i, j, length;
int length;
Bignum b;
getstring(data, datalen, &p, &length);
@ -59,37 +42,16 @@ static Bignum getmp(char **data, int *datalen) {
return NULL;
if (p[0] & 0x80)
return NULL; /* negative mp */
b = newbn((length+1)/2);
for (i = 0; i < length; i++) {
j = length - 1 - i;
if (j & 1)
b[j/2+1] |= ((unsigned char)p[i]) << 8;
else
b[j/2+1] |= ((unsigned char)p[i]);
}
while (b[0] > 1 && b[b[0]] == 0) b[0]--;
b = bignum_from_bytes(p, length);
return b;
}
static Bignum get160(char **data, int *datalen) {
char *p;
int i, j, length;
Bignum b;
p = *data;
b = bignum_from_bytes(*data, 20);
*data += 20; *datalen -= 20;
length = 20;
while (length > 0 && !p[0])
p++, length--;
b = newbn((length+1)/2);
for (i = 0; i < length; i++) {
j = length - 1 - i;
if (j & 1)
b[j/2+1] |= ((unsigned char)p[i]) << 8;
else
b[j/2+1] |= ((unsigned char)p[i]);
}
return b;
}
@ -145,7 +107,10 @@ static char *dss_fmtkey(void *key) {
if (!dss->p)
return NULL;
len = 8 + 4 + 1; /* 4 x "0x", punctuation, \0 */
len += 4 * (dss->p[0] + dss->q[0] + dss->g[0] + dss->y[0]); /* digits */
len += 4 * (ssh1_bignum_bitcount(dss->p)+15)/16;
len += 4 * (ssh1_bignum_bitcount(dss->q)+15)/16;
len += 4 * (ssh1_bignum_bitcount(dss->g)+15)/16;
len += 4 * (ssh1_bignum_bitcount(dss->y)+15)/16;
p = smalloc(len);
if (!p) return NULL;
@ -222,7 +187,7 @@ static int dss_verifysig(void *key, char *sig, int siglen,
int i;
printf("sig:");
for (i=0;i<siglen;i++)
printf(" %02xf", (unsigned char)(sig[i]));
printf(" %02x", (unsigned char)(sig[i]));
printf("\n");
}
#endif