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/*
20140203
20241210 - reformated using clang-format
Jan Mojzis
Public domain.
*/
#include "crypto.h"
#include "stringparser.h"
#include "str.h"
#include "byte.h"
#include "e.h"
#include "log.h"
#include "bug.h"
#include "sshcrypto.h"
struct sshcrypto_kex sshcrypto_kexs[] = {
{
"curve25519-sha256",
curve25519_enc,
crypto_scalarmult_curve25519_BYTES, /* pk */
crypto_scalarmult_curve25519_BYTES, /* c */
crypto_scalarmult_curve25519_BYTES, /* k */
crypto_hash_sha256,
crypto_hash_sha256_BYTES,
curve25519_putkemkey,
sshcrypto_TYPENEWCRYPTO,
0,
},
{
"curve25519-sha256@libssh.org",
curve25519_enc,
crypto_scalarmult_curve25519_BYTES, /* pk */
crypto_scalarmult_curve25519_BYTES, /* c */
crypto_scalarmult_curve25519_BYTES, /* k */
crypto_hash_sha256,
crypto_hash_sha256_BYTES,
curve25519_putkemkey,
sshcrypto_TYPENEWCRYPTO,
0,
},
{
"sntrup761x25519-sha512@openssh.com",
crypto_kem_sntrup761x25519_enc,
crypto_kem_sntrup761x25519_PUBLICKEYBYTES, /* pk */
crypto_kem_sntrup761x25519_CIPHERTEXTBYTES, /* c */
crypto_kem_sntrup761x25519_BYTES, /* k */
crypto_hash_sha512,
crypto_hash_sha512_BYTES,
sntrup761x25519_putkemkey,
sshcrypto_TYPEPQCRYPTO,
0,
},
{
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
},
};
struct sshcrypto_pseudokex sshcrypto_pseudokexs[] = {
{
"kex-strict-s-v00@openssh.com",
"kex-strict-c-v00@openssh.com",
sshcrypto_FLAGSTRICTKEX,
},
{
0,
0,
0,
},
};
int sshcrypto_kex_flags = 0;
const char *sshcrypto_kex_name = 0;
int (*sshcrypto_enc)(unsigned char *, unsigned char *,
const unsigned char *) = 0;
long long sshcrypto_kem_publickeybytes = 0;
long long sshcrypto_kem_ciphertextbytes = 0;
long long sshcrypto_kem_bytes = 0;
int (*sshcrypto_hash)(unsigned char *, const unsigned char *,
unsigned long long) = 0;
long long sshcrypto_hash_bytes = 0;
void (*sshcrypto_buf_putkemkey)(struct buf *, const unsigned char *) = 0;
int sshcrypto_kex_select(const unsigned char *buf, long long len,
crypto_uint8 *kex_guess) {
long long i, pos;
const unsigned char *x;
long long xlen;
if (sshcrypto_kex_name) return 1;
if (buf[len] != 0) bug_proto();
log_d2("kex: client: kex algorithms: ", (const char *) buf);
*kex_guess = 1;
pos = 0;
for (;;) {
pos = stringparser(buf, len, pos, &x, &xlen);
if (!pos) break;
for (i = 0; sshcrypto_pseudokexs[i].name; ++i) {
if (str_equaln((const char *) x, xlen,
sshcrypto_pseudokexs[i].cname)) {
log_d2("kex: pseudokex selected: ",
sshcrypto_pseudokexs[i].name);
sshcrypto_kex_flags |= sshcrypto_pseudokexs[i].flag;
}
}
}
pos = 0;
for (;;) {
pos = stringparser(buf, len, pos, &x, &xlen);
if (!pos) break;
for (i = 0; sshcrypto_kexs[i].name; ++i) {
if (!sshcrypto_kexs[i].flagenabled) continue;
if (str_equaln((const char *) x, xlen, sshcrypto_kexs[i].name)) {
sshcrypto_kex_name = sshcrypto_kexs[i].name;
sshcrypto_enc = sshcrypto_kexs[i].enc;
sshcrypto_kem_publickeybytes =
sshcrypto_kexs[i].kem_publickeybytes;
sshcrypto_kem_ciphertextbytes =
sshcrypto_kexs[i].kem_ciphertextbytes;
sshcrypto_kem_bytes = sshcrypto_kexs[i].kem_bytes;
sshcrypto_hash = sshcrypto_kexs[i].hash;
sshcrypto_hash_bytes = sshcrypto_kexs[i].hash_bytes;
sshcrypto_buf_putkemkey = sshcrypto_kexs[i].buf_putkemkey;
log_d2("kex: kex selected: ", sshcrypto_kexs[i].name);
return 1;
}
}
*kex_guess = 0;
}
log_d2("kex: kex not available ", (const char *) buf);
errno = EPROTO;
return 0;
}
void sshcrypto_kex_put(struct buf *b) {
crypto_uint32 len = 0;
long long i, j, start;
j = 0;
for (i = 0; sshcrypto_kexs[i].name; ++i) {
if (!sshcrypto_kexs[i].flagenabled) continue;
if (j++) ++len;
len += str_len(sshcrypto_kexs[i].name);
}
for (i = 0; sshcrypto_pseudokexs[i].name; ++i) {
if (j++) ++len;
len += str_len(sshcrypto_pseudokexs[i].name);
}
buf_putnum32(b, len);
start = b->len;
j = 0;
for (i = 0; sshcrypto_kexs[i].name; ++i) {
if (!sshcrypto_kexs[i].flagenabled) continue;
if (j++) buf_puts(b, ",");
buf_puts(b, sshcrypto_kexs[i].name);
}
for (i = 0; sshcrypto_pseudokexs[i].name; ++i) {
if (j++) buf_puts(b, ",");
buf_puts(b, sshcrypto_pseudokexs[i].name);
}
b->buf[b->len] = 0;
log_d2("kex: server: kex algorithms: ", (char *) b->buf + start);
}
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