x4s_buf x4_dh_shared(const uint8 * g, size_t glen,
const uint8 * p, size_t plen,
const uint8 * x, size_t xlen,
const uint8 * gx, size_t gxlen,
const uint8 * gy, size_t gylen)
{
DH * dh;
BIGNUM * bn;
x4s_buf gxy = { 0 };
/* */
x4_assert(gx && gxlen && gy && gylen);
/* */
dh = _dh_init(g,glen, p,plen, x,xlen);
x4_assert(dh);
dh->pub_key = BN_bin2bn(gx, gxlen, 0);
x4_assert(dh->pub_key);
bn = BN_bin2bn(gy, gylen, 0);
x4_assert(bn);
x4_buf_resize(&gxy, DH_size(dh));
DH_compute_key(gxy.data, bn, dh);
DH_free(dh);
return gxy;
}
bool
tr_dh_make_key (tr_dh_ctx_t raw_handle,
size_t private_key_length,
uint8_t * public_key,
size_t * public_key_length)
{
DH * handle = raw_handle;
int dh_size, my_public_key_length;
const BIGNUM * hand_pub_key;
assert (handle != NULL);
assert (public_key != NULL);
DH_set_length(handle, private_key_length * 8);
if (!check_result (DH_generate_key (handle)))
return false;
DH_get0_key (handle, &hand_pub_key, NULL);
my_public_key_length = BN_bn2bin (hand_pub_key, public_key);
dh_size = DH_size (handle);
tr_dh_align_key (public_key, my_public_key_length, dh_size);
if (public_key_length != NULL)
*public_key_length = dh_size;
return true;
}
void
tls_ctx_load_dh_params (struct tls_root_ctx *ctx, const char *dh_file,
const char *dh_file_inline
)
{
DH *dh;
BIO *bio;
ASSERT(NULL != ctx);
if (!strcmp (dh_file, INLINE_FILE_TAG) && dh_file_inline)
{
if (!(bio = BIO_new_mem_buf ((char *)dh_file_inline, -1)))
msg (M_SSLDHERR, "Cannot open memory BIO for inline DH parameters");
}
else
{
/* Get Diffie Hellman Parameters */
if (!(bio = BIO_new_file (dh_file, "r")))
msg (M_SSLDHERR, "Cannot open %s for DH parameters", dh_file);
}
dh = PEM_read_bio_DHparams (bio, NULL, NULL, NULL);
BIO_free (bio);
if (!dh)
msg (M_SSLDHERR, "Cannot load DH parameters from %s", dh_file);
if (!SSL_CTX_set_tmp_dh (ctx->ctx, dh))
msg (M_SSLDHERR, "SSL_CTX_set_tmp_dh");
msg (D_TLS_DEBUG_LOW, "Diffie-Hellman initialized with %d bit key",
8 * DH_size (dh));
DH_free (dh);
}
static isc_result_t
openssldh_computesecret(const dst_key_t *pub, const dst_key_t *priv,
isc_buffer_t *secret)
{
DH *dhpub, *dhpriv;
int ret;
isc_region_t r;
unsigned int len;
REQUIRE(pub->keydata.dh != NULL);
REQUIRE(priv->keydata.dh != NULL);
dhpub = pub->keydata.dh;
dhpriv = priv->keydata.dh;
len = DH_size(dhpriv);
isc_buffer_availableregion(secret, &r);
if (r.length < len)
return (ISC_R_NOSPACE);
ret = DH_compute_key(r.base, dhpub->pub_key, dhpriv);
if (ret == 0)
return (dst__openssl_toresult2("DH_compute_key",
DST_R_COMPUTESECRETFAILURE));
isc_buffer_add(secret, len);
return (ISC_R_SUCCESS);
}
static int init_dh(SSL_CTX *ctx, const char *cert) {
DH *dh;
BIO *bio;
assert(cert);
bio = BIO_new_file(cert, "r");
if (!bio) {
ERR_print_errors_fp(stderr);
return -1;
}
dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
BIO_free(bio);
if (!dh) {
ERR("{core} Note: no DH parameters found in %s\n", cert);
return -1;
}
LOG("{core} Using DH parameters from %s\n", cert);
SSL_CTX_set_tmp_dh(ctx, dh);
LOG("{core} DH initialized with %d bit key\n", 8*DH_size(dh));
DH_free(dh);
return 0;
}
ERL_NIF_TERM dh_compute_key_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (OthersPublicKey, MyPrivateKey, DHParams=[P,G]) */
BIGNUM *other_pub_key = NULL,
*dh_p = NULL,
*dh_g = NULL;
DH *dh_priv = DH_new();
/* Check the arguments and get
my private key (dh_priv),
the peer's public key (other_pub_key),
the parameters p & q
*/
{
BIGNUM *dummy_pub_key = NULL,
*priv_key = NULL;
ERL_NIF_TERM head, tail;
if (!get_bn_from_bin(env, argv[0], &other_pub_key)
|| !get_bn_from_bin(env, argv[1], &priv_key)
|| !enif_get_list_cell(env, argv[2], &head, &tail)
|| !get_bn_from_bin(env, head, &dh_p)
|| !enif_get_list_cell(env, tail, &head, &tail)
|| !get_bn_from_bin(env, head, &dh_g)
|| !enif_is_empty_list(env, tail)
/* Note: DH_set0_key() does not allow setting only the
* private key, although DH_compute_key() does not use the
* public key. Work around this limitation by setting
* the public key to a copy of the private key.
*/
|| !(dummy_pub_key = BN_dup(priv_key))
|| !DH_set0_key(dh_priv, dummy_pub_key, priv_key)
|| !DH_set0_pqg(dh_priv, dh_p, NULL, dh_g)
) {
if (dh_p) BN_free(dh_p);
if (dh_g) BN_free(dh_g);
if (other_pub_key) BN_free(other_pub_key);
if (dummy_pub_key) BN_free(dummy_pub_key);
if (priv_key) BN_free(priv_key);
return enif_make_badarg(env);
}
}
{
ErlNifBinary ret_bin;
int size;
enif_alloc_binary(DH_size(dh_priv), &ret_bin);
size = DH_compute_key(ret_bin.data, other_pub_key, dh_priv);
BN_free(other_pub_key);
DH_free(dh_priv);
if (size<=0) {
enif_release_binary(&ret_bin);
return atom_error;
}
if (size != ret_bin.size) enif_realloc_binary(&ret_bin, size);
return enif_make_binary(env, &ret_bin);
}
}
tr_dh_secret_t
tr_dh_agree (tr_dh_ctx_t handle,
const uint8_t * other_public_key,
size_t other_public_key_length)
{
struct tr_dh_secret * ret;
int dh_size, secret_key_length;
BIGNUM * other_key;
assert (handle != NULL);
assert (other_public_key != NULL);
if (!check_pointer (other_key = BN_bin2bn (other_public_key, other_public_key_length, NULL)))
return NULL;
dh_size = DH_size (handle);
ret = tr_dh_secret_new (dh_size);
secret_key_length = DH_compute_key (ret->key, other_key, handle);
if (check_result_neq (secret_key_length, -1))
{
tr_dh_secret_align (ret, secret_key_length);
}
else
{
tr_dh_secret_free (ret);
ret = NULL;
}
BN_free (other_key);
return ret;
}
// Set the prime P and the generator, generate local public key
DH_key_exchange::DH_key_exchange ()
{
m_DH = DH_new ();
m_DH->p = BN_bin2bn (m_dh_prime, sizeof(m_dh_prime), NULL);
m_DH->g = BN_bin2bn (m_dh_generator, sizeof(m_dh_generator), NULL);
assert (sizeof(m_dh_prime) == DH_size(m_DH));
DH_generate_key (m_DH); // TODO Check != 0
assert (m_DH->pub_key);
// DH can generate key sizes that are smaller than the size of
// P with exponentially decreasing probability, in which case
// the msb's of m_dh_local_key need to be zeroed
// appropriately.
int key_size = get_local_key_size();
int len_dh = sizeof(m_dh_prime); // must equal DH_size(m_DH)
if (key_size != len_dh)
{
assert(key_size > 0 && key_size < len_dh);
int pad_zero_size = len_dh - key_size;
std::fill(m_dh_local_key, m_dh_local_key + pad_zero_size, 0);
BN_bn2bin(m_DH->pub_key, (unsigned char*)m_dh_local_key + pad_zero_size);
}
else
BN_bn2bin(m_DH->pub_key, (unsigned char*)m_dh_local_key); // TODO Check return value
}
struct sec performDH(char *pubkeyRec,DH *privkey){
struct sec s;
int secret_size;
/* Send the public key to the peer.
* How this occurs will be specific to your situation (see main text below) */
/* Receive the public key from the peer. In this example we're just hard coding a value */
BIGNUM *pubkey = NULL;
if(0 == (BN_dec2bn(&pubkey, pubkeyRec))) handleErrors();
/* Compute the shared secret */
unsigned char *secret;
if(NULL == (secret = OPENSSL_malloc(sizeof(unsigned char) * (DH_size(privkey))))) handleErrors();
if(0 > (secret_size = DH_compute_key(secret, pubkey, privkey))) handleErrors();
/* Do something with the shared secret */
/* Note secret_size may be less than DH_size(privkey) */
printf("The shared secret is:\n");
strcpy(s.value,secret);
s.length=secret_size;
/* Clean up */
OPENSSL_free(secret);
BN_free(pubkey);
DH_free(privkey);
return s;
}
void openssl_dh_crypt()
{
BIO *b;
DH *d1, *d2;
int i, len1, len2;
unsigned char skey1[COMM_LEN], skey2[COMM_LEN];
d1 = DH_new();
d2 = DH_new();
DH_generate_parameters_ex(d1, 64, DH_GENERATOR_2, NULL);
DH_check(d1, &i);
printf("\nDH key size: %d\n", DH_size(d1));
DH_generate_key(d1);
d2->p = BN_dup(d1->p);
d2->g = BN_dup(d1->g);
DH_generate_key(d2);
DH_check_pub_key(d1, d1->pub_key, &i);
len1 = DH_compute_key(skey1, d2->pub_key, d1);
len2 = DH_compute_key(skey2, d1->pub_key, d2);
if ((len1 != len2) || (memcmp(skey1, skey2, len1) != 0)) {
printf("DH_compute_key err!\n");
DH_free(d1);
DH_free(d2);
return;
}
b = BIO_new(BIO_s_file());
BIO_set_fp(b, stdout, BIO_NOCLOSE);
DHparams_print(b, d1);
BIO_free(b);
DH_free(d1);
DH_free(d2);
}
bool DHWrapper::CreateSharedKey(uint8_t *pPeerPublicKey, int32_t length) {
if (_pDH == NULL) {
FATAL("DHWrapper not initialized");
return false;
}
if (_sharedKeyLength != 0 || _pSharedKey != NULL) {
FATAL("Shared key already computed");
return false;
}
_sharedKeyLength = DH_size(_pDH);
if (_sharedKeyLength <= 0 || _sharedKeyLength > 1024) {
FATAL("Unable to get shared key size in bytes");
return false;
}
_pSharedKey = new uint8_t[_sharedKeyLength];
memset(_pSharedKey, 0, _sharedKeyLength);
_peerPublickey = BN_bin2bn(pPeerPublicKey, length, 0);
if (_peerPublickey == NULL) {
FATAL("Unable to get the peer public key");
return false;
}
if (DH_compute_key(_pSharedKey, _peerPublickey, _pDH) == -1) {
FATAL("Unable to compute the shared key");
return false;
}
return true;
}
const uint8_t*
tr_cryptoComputeSecret( tr_crypto * crypto,
const uint8_t * peerPublicKey )
{
int len;
uint8_t secret[KEY_LEN];
BIGNUM * bn = BN_bin2bn( peerPublicKey, KEY_LEN, NULL );
DH * dh;
ensureKeyExists( crypto );
dh = crypto->dh;
assert( DH_size( dh ) == KEY_LEN );
len = DH_compute_key( secret, bn, dh );
if( len == -1 )
logErrorFromSSL( );
else {
int offset;
assert( len <= KEY_LEN );
offset = KEY_LEN - len;
memset( crypto->mySecret, 0, offset );
memcpy( crypto->mySecret + offset, secret, len );
crypto->mySecretIsSet = 1;
}
BN_free( bn );
return crypto->mySecret;
}
int tr_compute_dh_key(unsigned char **pbuf,
BIGNUM *pub_key,
DH *priv_dh) {
size_t buflen;
unsigned char *buf = NULL;;
int rc = 0;
if ((!pbuf) ||
(!pub_key) ||
(!priv_dh)) {
tr_debug("tr_compute_dh_key: Invalid parameters.");
return(-1);
}
*pbuf = NULL;
buflen = DH_size(priv_dh);
buf = malloc(buflen);
if (buf == NULL) {
tr_crit("tr_compute_dh_key: out of memory");
return -1;
}
rc = DH_compute_key(buf, pub_key, priv_dh);
if (0 <= rc) {
*pbuf = buf;
}else {
free(buf);
}
return rc;
}
std::string avjackif::async_client_hello(boost::asio::yield_context yield_context)
{
proto::client_hello client_hello;
client_hello.set_client("avim");
client_hello.set_version(0001);
unsigned char to[512];
auto dh = DH_new();
DH_generate_parameters_ex(dh,64,DH_GENERATOR_5,NULL);
DH_generate_key(dh);
// 把 g,p, pubkey 传过去
client_hello.set_random_g((const void*)to, BN_bn2bin(dh->g, to));
client_hello.set_random_p((const void*)to, BN_bn2bin(dh->p, to));
client_hello.set_random_pub_key((const void*)to, BN_bn2bin(dh->pub_key, to));
auto tobesend = av_router::encode(client_hello);
boost::asio::async_write(*m_sock, boost::asio::buffer(tobesend), yield_context);
// 解码
std::unique_ptr<proto::server_hello> server_hello(
(proto::server_hello*)async_read_protobuf_message(*m_sock, yield_context));
m_remote_addr.reset(new proto::av_address(
av_address_from_string(server_hello->server_av_address())));
auto server_pubkey = BN_bin2bn((const unsigned char *) server_hello->random_pub_key().data(),
server_hello->random_pub_key().length(), NULL);
m_shared_key.resize(DH_size(dh));
// 密钥就算出来啦！
DH_compute_key(&m_shared_key[0], server_pubkey, dh);
BN_free(server_pubkey);
std::printf("key = 0x");
for (int i=0; i<DH_size(dh); ++i)
{
std::printf("%x%x", (m_shared_key[i] >> 4) & 0xf, m_shared_key[i] & 0xf);
}
std::printf("\n");
DH_free(dh);
return server_hello->random_pub_key();
}
static krb5_error_code
generate_dh_keyblock(krb5_context context, pk_client_params *client_params,
krb5_enctype enctype, krb5_keyblock *reply_key)
{
unsigned char *dh_gen_key = NULL;
krb5_keyblock key;
krb5_error_code ret;
size_t dh_gen_keylen, size;
memset(&key, 0, sizeof(key));
if (!DH_generate_key(client_params->dh)) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret, "Can't generate Diffie-Hellman keys");
goto out;
}
if (client_params->dh_public_key == NULL) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret, "dh_public_key");
goto out;
}
dh_gen_keylen = DH_size(client_params->dh);
size = BN_num_bytes(client_params->dh->p);
if (size < dh_gen_keylen)
size = dh_gen_keylen;
dh_gen_key = malloc(size);
if (dh_gen_key == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, "malloc: out of memory");
goto out;
}
memset(dh_gen_key, 0, size - dh_gen_keylen);
dh_gen_keylen = DH_compute_key(dh_gen_key + (size - dh_gen_keylen),
client_params->dh_public_key,
client_params->dh);
if (dh_gen_keylen == -1) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret, "Can't compute Diffie-Hellman key");
goto out;
}
ret = _krb5_pk_octetstring2key(context,
enctype,
dh_gen_key, dh_gen_keylen,
NULL, NULL,
reply_key);
out:
if (dh_gen_key)
free(dh_gen_key);
if (key.keyvalue.data)
krb5_free_keyblock_contents(context, &key);
return ret;
}
/*
* Generate an empheral DH key. Because this can take a long
* time to compute, we can use precomputed parameters of the
* common key sizes.
*
* Since few sites will bother to precompute these parameter
* files, we also provide a fallback to the parameters provided
* by the OpenSSL project.
*
* These values can be static (once loaded or computed) since
* the OpenSSL library can efficiently generate random keys from
* the information provided.
*/
static DH *
tmp_dh_cb(SSL *s, int is_export, int keylength)
{
DH *r = NULL;
static DH *dh = NULL;
static DH *dh512 = NULL;
static DH *dh1024 = NULL;
static DH *dh2048 = NULL;
static DH *dh4096 = NULL;
switch (keylength)
{
case 512:
if (dh512 == NULL)
dh512 = load_dh_file(keylength);
if (dh512 == NULL)
dh512 = load_dh_buffer(file_dh512, sizeof file_dh512);
r = dh512;
break;
case 1024:
if (dh1024 == NULL)
dh1024 = load_dh_file(keylength);
if (dh1024 == NULL)
dh1024 = load_dh_buffer(file_dh1024, sizeof file_dh1024);
r = dh1024;
break;
case 2048:
if (dh2048 == NULL)
dh2048 = load_dh_file(keylength);
if (dh2048 == NULL)
dh2048 = load_dh_buffer(file_dh2048, sizeof file_dh2048);
r = dh2048;
break;
case 4096:
if (dh4096 == NULL)
dh4096 = load_dh_file(keylength);
if (dh4096 == NULL)
dh4096 = load_dh_buffer(file_dh4096, sizeof file_dh4096);
r = dh4096;
break;
default:
if (dh == NULL)
dh = load_dh_file(keylength);
r = dh;
}
/* this may take a long time, but it may be necessary... */
if (r == NULL || 8 * DH_size(r) < keylength)
r = DH_generate_parameters(keylength, DH_GENERATOR_2, NULL, NULL);
return r;
}
ssize_t
tls_get_connection_info(struct tls *ctx, char *buf, size_t buflen)
{
SSL *conn = ctx->ssl_conn;
const char *ocsp_pfx = "", *ocsp_info = "";
const char *proto = "-", *cipher = "-";
char dh[64];
int used_dh_bits = ctx->used_dh_bits, used_ecdh_nid = ctx->used_ecdh_nid;
if (conn != NULL) {
proto = SSL_get_version(conn);
cipher = SSL_get_cipher(conn);
#ifdef SSL_get_server_tmp_key
if (ctx->flags & TLS_CLIENT) {
EVP_PKEY *pk = NULL;
int ok = SSL_get_server_tmp_key(conn, &pk);
int pk_type = EVP_PKEY_id(pk);
if (ok && pk) {
if (pk_type == EVP_PKEY_DH) {
DH *dh = EVP_PKEY_get0(pk);
used_dh_bits = DH_size(dh) * 8;
} else if (pk_type == EVP_PKEY_EC) {
EC_KEY *ecdh = EVP_PKEY_get0(pk);
const EC_GROUP *eg = EC_KEY_get0_group(ecdh);
used_ecdh_nid = EC_GROUP_get_curve_name(eg);
}
EVP_PKEY_free(pk);
}
}
#endif
}
if (used_dh_bits) {
snprintf(dh, sizeof dh, "/DH=%d", used_dh_bits);
} else if (used_ecdh_nid) {
snprintf(dh, sizeof dh, "/ECDH=%s", OBJ_nid2sn(used_ecdh_nid));
} else {
dh[0] = 0;
}
if (ctx->ocsp_result) {
ocsp_info = ctx->ocsp_result;
ocsp_pfx = "/OCSP=";
}
return snprintf(buf, buflen, "%s/%s%s%s%s", proto, cipher, dh, ocsp_pfx, ocsp_info);
}
NOEXPORT int init_dh(SERVICE_OPTIONS *section) {
DH *dh=NULL;
s_log(LOG_DEBUG, "DH initialization");
#ifdef HAVE_OSSL_ENGINE_H
if(!section->engine) /* cert is a file and not an identifier */
#endif
dh=read_dh(section->cert);
if(!dh)
dh=get_dh2048();
if(!dh) {
s_log(LOG_NOTICE, "DH initialization failed");
return 1; /* FAILED */
}
SSL_CTX_set_tmp_dh(section->ctx, dh);
s_log(LOG_DEBUG, "DH initialized with %d-bit key", 8*DH_size(dh));
DH_free(dh);
return 0; /* OK */
}
int s2n_dh_compute_shared_secret_as_client(struct s2n_dh_params *server_dh_params, struct s2n_stuffer *Yc_out, struct s2n_blob *shared_key)
{
struct s2n_dh_params client_params;
uint8_t *client_pub_key;
uint16_t client_pub_key_size;
int shared_key_size;
GUARD(s2n_dh_params_check(server_dh_params));
GUARD(s2n_dh_params_copy(server_dh_params, &client_params));
GUARD(s2n_dh_generate_ephemeral_key(&client_params));
GUARD(s2n_alloc(shared_key, DH_size(server_dh_params->dh)));
const BIGNUM *client_pub_key_bn = s2n_get_Ys_dh_param(&client_params);
client_pub_key_size = BN_num_bytes(client_pub_key_bn);
GUARD(s2n_stuffer_write_uint16(Yc_out, client_pub_key_size));
client_pub_key = s2n_stuffer_raw_write(Yc_out, client_pub_key_size);
if (client_pub_key == NULL) {
GUARD(s2n_free(shared_key));
GUARD(s2n_dh_params_free(&client_params));
S2N_ERROR(S2N_ERR_DH_WRITING_PUBLIC_KEY);
}
if (BN_bn2bin(client_pub_key_bn, client_pub_key) != client_pub_key_size) {
GUARD(s2n_free(shared_key));
GUARD(s2n_dh_params_free(&client_params));
S2N_ERROR(S2N_ERR_DH_COPYING_PUBLIC_KEY);
}
/* server_dh_params already validated */
const BIGNUM *server_pub_key_bn = s2n_get_Ys_dh_param(server_dh_params);
shared_key_size = DH_compute_key(shared_key->data, server_pub_key_bn, client_params.dh);
if (shared_key_size < 0) {
GUARD(s2n_free(shared_key));
GUARD(s2n_dh_params_free(&client_params));
S2N_ERROR(S2N_ERR_DH_SHARED_SECRET);
}
shared_key->size = shared_key_size;
GUARD(s2n_dh_params_free(&client_params));
return 0;
}
static int
init_dh(SSL_CTX * ctx, unsigned char *dhparam)
{
int rc = TRUE;
BIO *bio = 0;
DH *dh = 0;
if (dhparam == NULL)
return TRUE;
if ((bio = BIO_new_file((char *) dhparam, "r")) == NULL) {
LOG(SPOCP_ERR)
traceLog(LOG_ERR,"DH: could not read %s: %s", dhparam,
strerror(errno));
rc = FALSE;
} else {
if ((dh =
PEM_read_bio_DHparams(bio, NULL, NULL, NULL)) == NULL) {
LOG(SPOCP_ERR)
traceLog(LOG_ERR,"DH: could not load params from %s",
dhparam);
rc = FALSE;
} else {
if (SSL_CTX_set_tmp_dh(ctx, dh) < 0) {
LOG(SPOCP_DEBUG)
traceLog(LOG_ERR,
"Couldn't set Diffie-Hellman parameters");
rc = FALSE;
} else
LOG(SPOCP_DEBUG)
traceLog(LOG_ERR,
"Diffie-Hellman initialised from %s with %d-bit key",
dhparam, 8 * DH_size(dh));
DH_free(dh);
}
BIO_free(bio);
}
return rc;
}
bool OSSLDH::deriveKey(SymmetricKey **ppSymmetricKey, PublicKey* publicKey, PrivateKey* privateKey)
{
// Check parameters
if ((ppSymmetricKey == NULL) ||
(publicKey == NULL) ||
(privateKey == NULL))
{
return false;
}
// Get keys
DH *pub = ((OSSLDHPublicKey *)publicKey)->getOSSLKey();
DH *priv = ((OSSLDHPrivateKey *)privateKey)->getOSSLKey();
if (pub == NULL || pub->pub_key == NULL || priv == NULL)
{
ERROR_MSG("Failed to get OpenSSL DH keys");
return false;
}
// Derive the secret
ByteString secret;
secret.resize(DH_size(priv));;
if (DH_compute_key(&secret[0], pub->pub_key, priv) <= 0)
{
ERROR_MSG("DH key derivation failed (0x%08X)", ERR_get_error());
return false;
}
*ppSymmetricKey = new SymmetricKey;
if (*ppSymmetricKey == NULL)
return false;
if (!(*ppSymmetricKey)->setKeyBits(secret))
{
delete *ppSymmetricKey;
*ppSymmetricKey = NULL;
return false;
}
return true;
}
int Condor_Diffie_Hellman :: compute_shared_secret(const char * pk)
{
// the input pk is assumed to be an encoded string representing
// the binary data for the remote party's public key -- y (or x)
// the local DH knows about g and x, now, it will compute
// (g^x)^y, or (g^y)^x
BIGNUM * remote_pubKey = NULL;
if (BN_hex2bn(&remote_pubKey, pk) == 0) {
dprintf(D_ALWAYS, "Unable to obtain remote public key\n");
goto error;
}
if ((dh_ != NULL) && (remote_pubKey != NULL)) {
secret_ = (unsigned char *) malloc(DH_size(dh_));
// Now compute
keySize_ = DH_compute_key(secret_, remote_pubKey, dh_);
BN_clear_free(remote_pubKey);
if (keySize_ == -1) {
dprintf(D_ALWAYS, "Unable to compute shared secret\n");
goto error;
}
}
else {
goto error;
}
return 1;
error:
if (remote_pubKey) {
BN_clear_free(remote_pubKey);
}
if (secret_) {
free(secret_);
secret_ = NULL;
}
return 0;
}
static void
tls_info_callback(const SSL *ssl, int where, int rc)
{
struct tls *ctx = SSL_get_app_data(ssl);
/* steal info about used DH key */
if (ssl->s3 && ssl->s3->tmp.dh && !ctx->used_dh_bits) {
ctx->used_dh_bits = DH_size(ssl->s3->tmp.dh) * 8;
} else if (ssl->s3 && ssl->s3->tmp.ecdh && !ctx->used_ecdh_nid) {
ctx->used_ecdh_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ssl->s3->tmp.ecdh));
}
/* detect renegotation on established connection */
if (where & SSL_CB_HANDSHAKE_START) {
if (ctx->state & TLS_STATE_ESTABLISHED)
ctx->state |= TLS_STATE_ABORT;
} else if (where & SSL_CB_HANDSHAKE_DONE) {
ctx->state |= TLS_STATE_ESTABLISHED;
}
}
static int init_dh(void) {
#ifdef USE_DH
FILE *fp;
DH *dh;
BIO *bio;
fp=fopen(options.cert, "r");
if(!fp) {
#ifdef USE_WIN32
/* Win32 doesn't seem to set errno in fopen() */
log(LOG_ERR, "Failed to open %s", options.cert);
#else
ioerror(options.cert);
#endif
return -1; /* FAILED */
}
bio=BIO_new_fp(fp, BIO_CLOSE|BIO_FP_TEXT);
if(!bio) {
log(LOG_ERR, "BIO_new_fp failed");
return -1; /* FAILED */
}
if((dh=PEM_read_bio_DHparams(bio, NULL, NULL
#if SSLEAY_VERSION_NUMBER >= 0x00904000L
, NULL
#endif
))) {
BIO_free(bio);
log(LOG_DEBUG, "Using Diffie-Hellman parameters from %s",
options.cert);
} else { /* Failed to load DH parameters from file */
BIO_free(bio);
log(LOG_NOTICE, "Could not load DH parameters from %s", options.cert);
return -1; /* FAILED */
}
SSL_CTX_set_tmp_dh(ctx, dh);
log(LOG_INFO, "Diffie-Hellman initialized with %d bit key",
8*DH_size(dh));
DH_free(dh);
#endif /* USE_DH */
return 0; /* OK */
}
BUF_MEM *
dh_compute_key(EVP_PKEY *key, const BUF_MEM * in, BN_CTX *bn_ctx)
{
BUF_MEM * out = NULL;
BIGNUM * bn = NULL;
DH *dh = NULL;
check(key && in, "Invalid arguments");
dh = EVP_PKEY_get1_DH(key);
if (!dh)
return NULL;
/* decode public key */
bn = BN_bin2bn((unsigned char *) in->data, in->length, bn);
if (!bn)
goto err;
out = BUF_MEM_create(DH_size(dh));
if (!out)
goto err;
out->length = DH_compute_key((unsigned char *) out->data, bn, dh);
if ((int) out->length < 0)
goto err;
BN_clear_free(bn);
DH_free(dh);
return out;
err:
if (out)
BUF_MEM_free(out);
if (bn)
BN_clear_free(bn);
if (dh)
DH_free(dh);
return NULL;
}
/*
* Load precomputed DH parameters.
*
* To prevent "downgrade" attacks, we perform a number of checks
* to verify that the DBA-generated DH parameters file contains
* what we expect it to contain.
*/
static DH *
load_dh_file(int keylength)
{
char homedir[MAXPGPATH];
char fnbuf[MAXPGPATH];
FILE *fp;
DH *dh;
int codes;
if (!pqGetHomeDirectory(homedir, sizeof(homedir)))
return NULL;
/* attempt to open file. It's not an error if it doesn't exist. */
snprintf(fnbuf, sizeof(fnbuf), DHFILEPATTERN, homedir, keylength);
if ((fp = fopen(fnbuf, "r")) == NULL)
return NULL;
/* flock(fileno(fp), LOCK_SH); */
dh = PEM_read_DHparams(fp, NULL, NULL, NULL);
/* flock(fileno(fp), LOCK_UN); */
fclose(fp);
/* is the prime the correct size? */
if (dh != NULL && 8 * DH_size(dh) < keylength)
dh = NULL;
/* make sure the DH parameters are usable */
if (dh != NULL)
{
if (DH_check(dh, &codes))
return NULL;
if (codes & DH_CHECK_P_NOT_PRIME)
return NULL;
if ((codes & DH_NOT_SUITABLE_GENERATOR) &&
(codes & DH_CHECK_P_NOT_SAFE_PRIME))
return NULL;
}
return dh;
}
/*
* call-seq:
* dh.compute_key(pub_bn) -> aString
*
* Returns a String containing a shared secret computed from the other party's public value.
* See DH_compute_key() for further information.
*
* === Parameters
* * +pub_bn+ is a OpenSSL::BN, *not* the DH instance returned by
* DH#public_key as that contains the DH parameters only.
*/
static VALUE
ossl_dh_compute_key(VALUE self, VALUE pub)
{
DH *dh;
EVP_PKEY *pkey;
BIGNUM *pub_key;
VALUE str;
int len;
GetPKeyDH(self, pkey);
dh = pkey->pkey.dh;
pub_key = GetBNPtr(pub);
len = DH_size(dh);
str = rb_str_new(0, len);
if ((len = DH_compute_key((unsigned char *)RSTRING_PTR(str), pub_key, dh)) < 0) {
ossl_raise(eDHError, NULL);
}
rb_str_set_len(str, len);
return str;
}
/*
* call-seq:
* dh.compute_key(pub_bn) -> aString
*
* Returns a String containing a shared secret computed from the other party's public value.
* See DH_compute_key() for further information.
*
* === Parameters
* * +pub_bn+ is a OpenSSL::BN, *not* the DH instance returned by
* DH#public_key as that contains the DH parameters only.
*/
static VALUE
ossl_dh_compute_key(VALUE self, VALUE pub)
{
DH *dh;
const BIGNUM *pub_key, *dh_p;
VALUE str;
int len;
GetDH(self, dh);
DH_get0_pqg(dh, &dh_p, NULL, NULL);
if (!dh_p)
ossl_raise(eDHError, "incomplete DH");
pub_key = GetBNPtr(pub);
len = DH_size(dh);
str = rb_str_new(0, len);
if ((len = DH_compute_key((unsigned char *)RSTRING_PTR(str), pub_key, dh)) < 0) {
ossl_raise(eDHError, NULL);
}
rb_str_set_len(str, len);
return str;
}
static void
tls_info_callback(const SSL *ssl, int where, int rc)
{
struct tls *ctx = SSL_get_app_data(ssl);
#ifdef USE_LIBSSL_INTERNALS
if (!(ctx->state & TLS_HANDSHAKE_COMPLETE) && ssl->s3) {
/* steal info about used DH key */
if (ssl->s3->tmp.dh && !ctx->used_dh_bits) {
ctx->used_dh_bits = DH_size(ssl->s3->tmp.dh) * 8;
} else if (ssl->s3->tmp.ecdh && !ctx->used_ecdh_nid) {
ctx->used_ecdh_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ssl->s3->tmp.ecdh));
}
}
#endif
/* detect renegotation on established connection */
if (where & SSL_CB_HANDSHAKE_START) {
if (ctx->state & TLS_HANDSHAKE_COMPLETE)
ctx->state |= TLS_DO_ABORT;
}
}
int s2n_pkcs3_to_dh_params(struct s2n_dh_params *dh_params, struct s2n_blob *pkcs3)
{
uint8_t *original_ptr = pkcs3->data;
dh_params->dh = d2i_DHparams(NULL, (const unsigned char **)(void *)&pkcs3->data, pkcs3->size);
GUARD(s2n_check_p_g_dh_params(dh_params));
if (pkcs3->data - original_ptr != pkcs3->size) {
DH_free(dh_params->dh);
S2N_ERROR(S2N_ERR_INVALID_PKCS3);
}
pkcs3->data = original_ptr;
/* Require at least 2048 bits for the DH size */
if (DH_size(dh_params->dh) < S2N_MIN_DH_PRIME_SIZE_BYTES) {
DH_free(dh_params->dh);
S2N_ERROR(S2N_ERR_DH_TOO_SMALL);
}
/* Check the generator and prime */
GUARD(s2n_dh_params_check(dh_params));
return 0;
}