static int kdf_sshkdf_derive(EVP_KDF_IMPL *impl, unsigned char *key,
size_t keylen)
{
if (impl->md == NULL) {
KDFerr(KDF_F_KDF_SSHKDF_DERIVE, KDF_R_MISSING_MESSAGE_DIGEST);
return 0;
}
if (impl->key == NULL) {
KDFerr(KDF_F_KDF_SSHKDF_DERIVE, KDF_R_MISSING_KEY);
return 0;
}
if (impl->xcghash == NULL) {
KDFerr(KDF_F_KDF_SSHKDF_DERIVE, KDF_R_MISSING_XCGHASH);
return 0;
}
if (impl->session_id == NULL) {
KDFerr(KDF_F_KDF_SSHKDF_DERIVE, KDF_R_MISSING_SESSION_ID);
return 0;
}
if (impl->type == 0) {
KDFerr(KDF_F_KDF_SSHKDF_DERIVE, KDF_R_MISSING_TYPE);
return 0;
}
return SSHKDF(impl->md, impl->key, impl->key_len,
impl->xcghash, impl->xcghash_len,
impl->session_id, impl->session_id_len,
impl->type, key, keylen);
}
static int pkey_tls1_prf_ctrl_str(EVP_PKEY_CTX *ctx,
const char *type, const char *value)
{
if (value == NULL) {
KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_VALUE_MISSING);
return 0;
}
if (strcmp(type, "md") == 0) {
TLS1_PRF_PKEY_CTX *kctx = ctx->data;
const EVP_MD *md = EVP_get_digestbyname(value);
if (md == NULL) {
KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_INVALID_DIGEST);
return 0;
}
kctx->md = md;
return 1;
}
if (strcmp(type, "secret") == 0)
return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_TLS_SECRET, value);
if (strcmp(type, "hexsecret") == 0)
return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_TLS_SECRET, value);
if (strcmp(type, "seed") == 0)
return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_TLS_SEED, value);
if (strcmp(type, "hexseed") == 0)
return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_TLS_SEED, value);
KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_UNKNOWN_PARAMETER_TYPE);
return -2;
}
static int kdf_sshkdf_ctrl_str(EVP_KDF_IMPL *impl, const char *type,
const char *value)
{
if (value == NULL) {
KDFerr(KDF_F_KDF_SSHKDF_CTRL_STR, KDF_R_VALUE_MISSING);
return 0;
}
if (strcmp(type, "md") == 0)
return kdf_md2ctrl(impl, kdf_sshkdf_ctrl, EVP_KDF_CTRL_SET_MD, value);
if (strcmp(type, "key") == 0)
return kdf_str2ctrl(impl, kdf_sshkdf_ctrl,
EVP_KDF_CTRL_SET_KEY, value);
if (strcmp(type, "hexkey") == 0)
return kdf_hex2ctrl(impl, kdf_sshkdf_ctrl,
EVP_KDF_CTRL_SET_KEY, value);
if (strcmp(type, "xcghash") == 0)
return kdf_str2ctrl(impl, kdf_sshkdf_ctrl,
EVP_KDF_CTRL_SET_SSHKDF_XCGHASH, value);
if (strcmp(type, "hexxcghash") == 0)
return kdf_hex2ctrl(impl, kdf_sshkdf_ctrl,
EVP_KDF_CTRL_SET_SSHKDF_XCGHASH, value);
if (strcmp(type, "session_id") == 0)
return kdf_str2ctrl(impl, kdf_sshkdf_ctrl,
EVP_KDF_CTRL_SET_SSHKDF_SESSION_ID, value);
if (strcmp(type, "hexsession_id") == 0)
return kdf_hex2ctrl(impl, kdf_sshkdf_ctrl,
EVP_KDF_CTRL_SET_SSHKDF_SESSION_ID, value);
if (strcmp(type, "type") == 0) {
if (strlen(value) != 1) {
KDFerr(KDF_F_KDF_SSHKDF_CTRL_STR, KDF_R_VALUE_ERROR);
return 0;
}
return call_ctrl(kdf_sshkdf_ctrl, impl, EVP_KDF_CTRL_SET_SSHKDF_TYPE,
(int)value[0]);
}
KDFerr(KDF_F_KDF_SSHKDF_CTRL_STR, KDF_R_UNKNOWN_PARAMETER_TYPE);
return -2;
}
static EVP_KDF_IMPL *kdf_sshkdf_new(void)
{
EVP_KDF_IMPL *impl;
if ((impl = OPENSSL_zalloc(sizeof(*impl))) == NULL)
KDFerr(KDF_F_KDF_SSHKDF_NEW, ERR_R_MALLOC_FAILURE);
return impl;
}
static int pkey_tls1_prf_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
size_t *keylen)
{
TLS1_PRF_PKEY_CTX *kctx = ctx->data;
if (kctx->md == NULL) {
KDFerr(KDF_F_PKEY_TLS1_PRF_DERIVE, KDF_R_MISSING_MESSAGE_DIGEST);
return 0;
}
if (kctx->sec == NULL) {
KDFerr(KDF_F_PKEY_TLS1_PRF_DERIVE, KDF_R_MISSING_SECRET);
return 0;
}
if (kctx->seedlen == 0) {
KDFerr(KDF_F_PKEY_TLS1_PRF_DERIVE, KDF_R_MISSING_SEED);
return 0;
}
return tls1_prf_alg(kctx->md, kctx->sec, kctx->seclen,
kctx->seed, kctx->seedlen,
key, *keylen);
}
/* Pass a message digest to a ctrl */
int kdf_md2ctrl(EVP_KDF_IMPL *impl,
int (*ctrl)(EVP_KDF_IMPL *impl, int cmd, va_list args),
int cmd, const char *md_name)
{
const EVP_MD *md;
if (md_name == NULL || (md = EVP_get_digestbyname(md_name)) == NULL) {
KDFerr(KDF_F_KDF_MD2CTRL, KDF_R_INVALID_DIGEST);
return 0;
}
return call_ctrl(ctrl, impl, cmd, md);
}
static int kdf_sshkdf_ctrl(EVP_KDF_IMPL *impl, int cmd, va_list args)
{
int t;
switch (cmd) {
case EVP_KDF_CTRL_SET_MD:
impl->md = va_arg(args, const EVP_MD *);
if (impl->md == NULL)
return 0;
return 1;
case EVP_KDF_CTRL_SET_KEY:
return kdf_sshkdf_parse_buffer_arg(&impl->key,
&impl->key_len, args);
case EVP_KDF_CTRL_SET_SSHKDF_XCGHASH:
return kdf_sshkdf_parse_buffer_arg(&impl->xcghash,
&impl->xcghash_len, args);
case EVP_KDF_CTRL_SET_SSHKDF_SESSION_ID:
return kdf_sshkdf_parse_buffer_arg(&impl->session_id,
&impl->session_id_len, args);
case EVP_KDF_CTRL_SET_SSHKDF_TYPE:
t = va_arg(args, int);
if (t < 65 || t > 70) {
KDFerr(KDF_F_KDF_SSHKDF_CTRL, KDF_R_VALUE_ERROR);
return 0;
}
impl->type = (char)t;
return 1;
default:
return -2;
}
}
