/*
* Return a malloc'ed chunk of memory containing the public blob of
* an RSA key, as given in the agent protocol (modulus bits,
* exponent, modulus).
*/
int rsakey_pubblob(const Filename *filename, void **blob, int *bloblen,
char **commentptr, const char **errorstr)
{
FILE *fp;
char buf[64];
struct RSAKey key;
int ret;
const char *error = NULL;
/* Default return if we fail. */
*blob = NULL;
*bloblen = 0;
ret = 0;
fp = f_open(filename, "rb", FALSE);
if (!fp) {
error = "can't open file";
goto end;
}
/*
* Read the first line of the file and see if it's a v1 private
* key file.
*/
if (fgets(buf, sizeof(buf), fp) && !strcmp(buf, rsa_signature)) {
memset(&key, 0, sizeof(key));
if (loadrsakey_main(fp, &key, TRUE, commentptr, NULL, &error)) {
*blob = rsa_public_blob(&key, bloblen);
freersakey(&key);
ret = 1;
}
fp = NULL; /* loadrsakey_main unconditionally closes fp */
} else {
error = "not an SSH-1 RSA file";
}
end:
if (fp)
fclose(fp);
if ((ret != 1) && errorstr)
*errorstr = error;
return ret;
}
/*
* Return a malloc'ed chunk of memory containing the public blob of
* an RSA key, as given in the agent protocol (modulus bits,
* exponent, modulus).
*/
int rsakey_pubblob(const Filename *filename, void **blob, int *bloblen,
char **commentptr, const char **errorstr)
{
FILE *fp;
char buf[64];
struct RSAKey key;
int ret;
const char *error = NULL;
/* Default return if we fail. */
*blob = NULL;
*bloblen = 0;
ret = 0;
fp = f_open(filename, "rb", FALSE);
if (!fp) {
error = "can't open file";
goto end;
}
/*
* Read the first line of the file and see if it's a v1 private
* key file.
*/
if (fgets(buf, sizeof(buf), fp) && !strcmp(buf, rsa_signature)) {
memset(&key, 0, sizeof(key));
if (loadrsakey_main(fp, &key, TRUE, commentptr, NULL, &error)) {
*blob = rsa_public_blob(&key, bloblen);
freersakey(&key);
ret = 1;
}
fp = NULL; /* loadrsakey_main unconditionally closes fp */
} else {
/*
* Try interpreting the file as an SSH-1 public key.
*/
char *line, *p, *bitsp, *expp, *modp, *commentp;
rewind(fp);
line = chomp(fgetline(fp));
p = line;
bitsp = p;
p += strspn(p, "0123456789");
if (*p != ' ')
goto not_public_either;
*p++ = '\0';
expp = p;
p += strspn(p, "0123456789");
if (*p != ' ')
goto not_public_either;
*p++ = '\0';
modp = p;
p += strspn(p, "0123456789");
if (*p) {
if (*p != ' ')
goto not_public_either;
*p++ = '\0';
commentp = p;
} else {
commentp = NULL;
}
memset(&key, 0, sizeof(key));
key.exponent = bignum_from_decimal(expp);
key.modulus = bignum_from_decimal(modp);
if (atoi(bitsp) != bignum_bitcount(key.modulus)) {
freebn(key.exponent);
freebn(key.modulus);
sfree(line);
error = "key bit count does not match in SSH-1 public key file";
goto end;
}
if (commentptr)
*commentptr = commentp ? dupstr(commentp) : NULL;
*blob = rsa_public_blob(&key, bloblen);
freersakey(&key);
return 1;
not_public_either:
sfree(line);
error = "not an SSH-1 RSA file";
}
end:
if (fp)
fclose(fp);
if ((ret != 1) && errorstr)
*errorstr = error;
return ret;
}