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RSA key authentication in ssh1 works; SSH2 is nearly there

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[originally from svn r572]
This commit is contained in:
Simon Tatham
2000-09-07 16:33:49 +00:00
parent 0f1e449189
commit d9af8f4b90
12 changed files with 1109 additions and 373 deletions
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57
sshrsa.c
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@ -39,49 +39,35 @@ static void bndebug(char *name, Bignum b) {
#include "ssh.h"
int makekey(unsigned char *data, struct RSAKey *result,
unsigned char **keystr) {
unsigned char **keystr, int order) {
unsigned char *p = data;
Bignum bn[2];
int i, j;
int w, b;
int i;
result->bits = 0;
for (i=0; i<4; i++)
result->bits = (result->bits << 8) + *p++;
for (j=0; j<2; j++) {
/*
* order=0 means exponent then modulus (the keys sent by the
* server). order=1 means modulus then exponent (the keys
* stored in a keyfile).
*/
w = 0;
for (i=0; i<2; i++)
w = (w << 8) + *p++;
result->bytes = b = (w+7)/8; /* bits -> bytes */
w = (w+15)/16; /* bits -> words */
bn[j] = newbn(w);
if (keystr) *keystr = p; /* point at key string, second time */
for (i=1; i<=w; i++)
bn[j][i] = 0;
for (i=b; i-- ;) {
unsigned char byte = *p++;
if (i & 1)
bn[j][1+i/2] |= byte<<8;
else
bn[j][1+i/2] |= byte;
}
debug(bn[j]);
}
result->exponent = bn[0];
result->modulus = bn[1];
if (order == 0)
p += ssh1_read_bignum(p, &result->exponent);
result->bytes = (((p[0] << 8) + p[1]) + 7) / 8;
if (keystr) *keystr = p+2;
p += ssh1_read_bignum(p, &result->modulus);
if (order == 1)
p += ssh1_read_bignum(p, &result->exponent);
return p - data;
}
int makeprivate(unsigned char *data, struct RSAKey *result) {
return ssh1_read_bignum(data, &result->private_exponent);
}
void rsaencrypt(unsigned char *data, int length, struct RSAKey *key) {
Bignum b1, b2;
int w, i;
@ -136,6 +122,13 @@ void rsaencrypt(unsigned char *data, int length, struct RSAKey *key) {
freebn(b2);
}
Bignum rsadecrypt(Bignum input, struct RSAKey *key) {
Bignum ret;
ret = newbn(key->modulus[0]);
modpow(input, key->private_exponent, key->modulus, ret);
return ret;
}
int rsastr_len(struct RSAKey *key) {
Bignum md, ex;