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openssl/crypto/kdf/sshkdf.c
Richard Levitte cee719c2d8 The use of the likes of UINT32_MAX requires internal/numbers.h 
Found a few more cases.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/8366)
2019-02-28 10:31:20 +01:00

290 lines
7.8 KiB
C
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/*
* Copyright 2018-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <openssl/evp.h>
#include <openssl/kdf.h>
#include "internal/cryptlib.h"
#include "internal/numbers.h"
#include "internal/evp_int.h"
#include "kdf_local.h"
/* See RFC 4253, Section 7.2 */
static void kdf_sshkdf_reset(EVP_KDF_IMPL *impl);
static int SSHKDF(const EVP_MD *evp_md,
const unsigned char *key, size_t key_len,
const unsigned char *xcghash, size_t xcghash_len,
const unsigned char *session_id, size_t session_id_len,
char type, unsigned char *okey, size_t okey_len);
struct evp_kdf_impl_st {
const EVP_MD *md;
unsigned char *key; /* K */
size_t key_len;
unsigned char *xcghash; /* H */
size_t xcghash_len;
char type; /* X */
unsigned char *session_id;
size_t session_id_len;
};
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 void kdf_sshkdf_free(EVP_KDF_IMPL *impl)
{
kdf_sshkdf_reset(impl);
OPENSSL_free(impl);
}
static void kdf_sshkdf_reset(EVP_KDF_IMPL *impl)
{
OPENSSL_clear_free(impl->key, impl->key_len);
OPENSSL_clear_free(impl->xcghash, impl->xcghash_len);
OPENSSL_clear_free(impl->session_id, impl->session_id_len);
memset(impl, 0, sizeof(*impl));
}
static int kdf_sshkdf_parse_buffer_arg(unsigned char **dst, size_t *dst_len,
va_list args)
{
const unsigned char *p;
size_t len;
p = va_arg(args, const unsigned char *);
len = va_arg(args, size_t);
OPENSSL_clear_free(*dst, *dst_len);
*dst = OPENSSL_memdup(p, len);
if (*dst == NULL)
return 0;
*dst_len = len;
return 1;
}
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;
}
}
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 size_t kdf_sshkdf_size(EVP_KDF_IMPL *impl)
{
return SIZE_MAX;
}
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);
}
const EVP_KDF_METHOD sshkdf_kdf_meth = {
EVP_KDF_SSHKDF,
kdf_sshkdf_new,
kdf_sshkdf_free,
kdf_sshkdf_reset,
kdf_sshkdf_ctrl,
kdf_sshkdf_ctrl_str,
kdf_sshkdf_size,
kdf_sshkdf_derive,
};
static int SSHKDF(const EVP_MD *evp_md,
const unsigned char *key, size_t key_len,
const unsigned char *xcghash, size_t xcghash_len,
const unsigned char *session_id, size_t session_id_len,
char type, unsigned char *okey, size_t okey_len)
{
EVP_MD_CTX *md = NULL;
unsigned char digest[EVP_MAX_MD_SIZE];
unsigned int dsize = 0;
size_t cursize = 0;
int ret = 0;
md = EVP_MD_CTX_new();
if (md == NULL)
return 0;
if (!EVP_DigestInit_ex(md, evp_md, NULL))
goto out;
if (!EVP_DigestUpdate(md, key, key_len))
goto out;
if (!EVP_DigestUpdate(md, xcghash, xcghash_len))
goto out;
if (!EVP_DigestUpdate(md, &type, 1))
goto out;
if (!EVP_DigestUpdate(md, session_id, session_id_len))
goto out;
if (!EVP_DigestFinal_ex(md, digest, &dsize))
goto out;
if (okey_len < dsize) {
memcpy(okey, digest, okey_len);
ret = 1;
goto out;
}
memcpy(okey, digest, dsize);
for (cursize = dsize; cursize < okey_len; cursize += dsize) {
if (!EVP_DigestInit_ex(md, evp_md, NULL))
goto out;
if (!EVP_DigestUpdate(md, key, key_len))
goto out;
if (!EVP_DigestUpdate(md, xcghash, xcghash_len))
goto out;
if (!EVP_DigestUpdate(md, okey, cursize))
goto out;
if (!EVP_DigestFinal_ex(md, digest, &dsize))
goto out;
if (okey_len < cursize + dsize) {
memcpy(okey + cursize, digest, okey_len - cursize);
ret = 1;
goto out;
}
memcpy(okey + cursize, digest, dsize);
}
ret = 1;
out:
EVP_MD_CTX_free(md);
OPENSSL_cleanse(digest, EVP_MAX_MD_SIZE);
return ret;
}
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