/*
* Generate a fingerprint string for the key. Compatible with the
* OpenSSH fingerprint code.
*/
char *rsa_ssh1_fingerprint(RSAKey *key)
{
unsigned char digest[16];
strbuf *out;
int i;
/*
* The hash preimage for SSH-1 key fingerprinting consists of the
* modulus and exponent _without_ any preceding length field -
* just the minimum number of bytes to represent each integer,
* stored big-endian, concatenated with no marker at the division
* between them.
*/
ssh_hash *hash = ssh_hash_new(&ssh_md5);
for (size_t i = (mp_get_nbits(key->modulus) + 7) / 8; i-- > 0 ;)
put_byte(hash, mp_get_byte(key->modulus, i));
for (size_t i = (mp_get_nbits(key->exponent) + 7) / 8; i-- > 0 ;)
put_byte(hash, mp_get_byte(key->exponent, i));
ssh_hash_final(hash, digest);
out = strbuf_new();
strbuf_catf(out, "%d ", mp_get_nbits(key->modulus));
for (i = 0; i < 16; i++)
strbuf_catf(out, "%s%02x", i ? ":" : "", digest[i]);
if (key->comment)
strbuf_catf(out, " %s", key->comment);
return strbuf_to_str(out);
}
char *rsastr_fmt(RSAKey *key)
{
strbuf *sb = strbuf_new();
append_hex_to_strbuf(sb, key->exponent);
append_hex_to_strbuf(sb, key->modulus);
return strbuf_to_str(sb);
}
static char *ecc_cache_str_shared(
const char *curve_name, mp_int *x, mp_int *y)
{
strbuf *sb = strbuf_new();
if (curve_name)
strbuf_catf(sb, "%s,", curve_name);
char *hx = mp_get_hex(x);
char *hy = mp_get_hex(y);
strbuf_catf(sb, "0x%s,0x%s", hx, hy);
sfree(hx);
sfree(hy);
return strbuf_to_str(sb);
}
