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cee719c2d8
Found a few more cases. Reviewed-by: Paul Dale <paul.dale@oracle.com> (Merged from https://github.com/openssl/openssl/pull/8366)
328 lines
9.0 KiB
C
328 lines
9.0 KiB
C
/*
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* Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <openssl/hmac.h>
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#include <openssl/evp.h>
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#include <openssl/kdf.h>
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#include "internal/cryptlib.h"
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#include "internal/numbers.h"
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#include "internal/evp_int.h"
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#include "kdf_local.h"
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#define HKDF_MAXBUF 1024
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static void kdf_hkdf_reset(EVP_KDF_IMPL *impl);
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static int HKDF(const EVP_MD *evp_md,
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const unsigned char *salt, size_t salt_len,
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const unsigned char *key, size_t key_len,
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const unsigned char *info, size_t info_len,
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unsigned char *okm, size_t okm_len);
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static int HKDF_Extract(const EVP_MD *evp_md,
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const unsigned char *salt, size_t salt_len,
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const unsigned char *key, size_t key_len,
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unsigned char *prk, size_t prk_len);
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static int HKDF_Expand(const EVP_MD *evp_md,
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const unsigned char *prk, size_t prk_len,
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const unsigned char *info, size_t info_len,
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unsigned char *okm, size_t okm_len);
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struct evp_kdf_impl_st {
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int mode;
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const EVP_MD *md;
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unsigned char *salt;
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size_t salt_len;
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unsigned char *key;
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size_t key_len;
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unsigned char info[HKDF_MAXBUF];
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size_t info_len;
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};
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static EVP_KDF_IMPL *kdf_hkdf_new(void)
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{
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EVP_KDF_IMPL *impl;
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if ((impl = OPENSSL_zalloc(sizeof(*impl))) == NULL)
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KDFerr(KDF_F_KDF_HKDF_NEW, ERR_R_MALLOC_FAILURE);
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return impl;
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}
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static void kdf_hkdf_free(EVP_KDF_IMPL *impl)
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{
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kdf_hkdf_reset(impl);
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OPENSSL_free(impl);
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}
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static void kdf_hkdf_reset(EVP_KDF_IMPL *impl)
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{
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OPENSSL_free(impl->salt);
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OPENSSL_clear_free(impl->key, impl->key_len);
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OPENSSL_cleanse(impl->info, impl->info_len);
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memset(impl, 0, sizeof(*impl));
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}
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static int kdf_hkdf_ctrl(EVP_KDF_IMPL *impl, int cmd, va_list args)
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{
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const unsigned char *p;
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size_t len;
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const EVP_MD *md;
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switch (cmd) {
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case EVP_KDF_CTRL_SET_MD:
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md = va_arg(args, const EVP_MD *);
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if (md == NULL)
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return 0;
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impl->md = md;
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return 1;
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case EVP_KDF_CTRL_SET_HKDF_MODE:
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impl->mode = va_arg(args, int);
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return 1;
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case EVP_KDF_CTRL_SET_SALT:
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p = va_arg(args, const unsigned char *);
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len = va_arg(args, size_t);
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if (len == 0 || p == NULL)
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return 1;
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OPENSSL_free(impl->salt);
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impl->salt = OPENSSL_memdup(p, len);
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if (impl->salt == NULL)
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return 0;
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impl->salt_len = len;
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return 1;
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case EVP_KDF_CTRL_SET_KEY:
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p = va_arg(args, const unsigned char *);
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len = va_arg(args, size_t);
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OPENSSL_clear_free(impl->key, impl->key_len);
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impl->key = OPENSSL_memdup(p, len);
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if (impl->key == NULL)
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return 0;
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impl->key_len = len;
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return 1;
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case EVP_KDF_CTRL_RESET_HKDF_INFO:
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OPENSSL_cleanse(impl->info, impl->info_len);
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impl->info_len = 0;
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return 1;
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case EVP_KDF_CTRL_ADD_HKDF_INFO:
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p = va_arg(args, const unsigned char *);
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len = va_arg(args, size_t);
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if (len == 0 || p == NULL)
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return 1;
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if (len > (HKDF_MAXBUF - impl->info_len))
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return 0;
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memcpy(impl->info + impl->info_len, p, len);
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impl->info_len += len;
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return 1;
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default:
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return -2;
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}
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}
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static int kdf_hkdf_ctrl_str(EVP_KDF_IMPL *impl, const char *type,
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const char *value)
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{
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if (strcmp(type, "mode") == 0) {
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int mode;
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if (strcmp(value, "EXTRACT_AND_EXPAND") == 0)
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mode = EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND;
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else if (strcmp(value, "EXTRACT_ONLY") == 0)
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mode = EVP_KDF_HKDF_MODE_EXTRACT_ONLY;
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else if (strcmp(value, "EXPAND_ONLY") == 0)
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mode = EVP_KDF_HKDF_MODE_EXPAND_ONLY;
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else
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return 0;
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return call_ctrl(kdf_hkdf_ctrl, impl, EVP_KDF_CTRL_SET_HKDF_MODE, mode);
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}
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if (strcmp(type, "digest") == 0)
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return kdf_md2ctrl(impl, kdf_hkdf_ctrl, EVP_KDF_CTRL_SET_MD, value);
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if (strcmp(type, "salt") == 0)
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return kdf_str2ctrl(impl, kdf_hkdf_ctrl, EVP_KDF_CTRL_SET_SALT, value);
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if (strcmp(type, "hexsalt") == 0)
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return kdf_hex2ctrl(impl, kdf_hkdf_ctrl, EVP_KDF_CTRL_SET_SALT, value);
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if (strcmp(type, "key") == 0)
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return kdf_str2ctrl(impl, kdf_hkdf_ctrl, EVP_KDF_CTRL_SET_KEY, value);
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if (strcmp(type, "hexkey") == 0)
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return kdf_hex2ctrl(impl, kdf_hkdf_ctrl, EVP_KDF_CTRL_SET_KEY, value);
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if (strcmp(type, "info") == 0)
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return kdf_str2ctrl(impl, kdf_hkdf_ctrl, EVP_KDF_CTRL_ADD_HKDF_INFO,
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value);
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if (strcmp(type, "hexinfo") == 0)
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return kdf_hex2ctrl(impl, kdf_hkdf_ctrl, EVP_KDF_CTRL_ADD_HKDF_INFO,
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value);
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return -2;
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}
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static size_t kdf_hkdf_size(EVP_KDF_IMPL *impl)
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{
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if (impl->mode != EVP_KDF_HKDF_MODE_EXTRACT_ONLY)
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return SIZE_MAX;
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if (impl->md == NULL) {
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KDFerr(KDF_F_KDF_HKDF_SIZE, KDF_R_MISSING_MESSAGE_DIGEST);
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return 0;
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}
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return EVP_MD_size(impl->md);
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}
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static int kdf_hkdf_derive(EVP_KDF_IMPL *impl, unsigned char *key,
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size_t keylen)
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{
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if (impl->md == NULL) {
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KDFerr(KDF_F_KDF_HKDF_DERIVE, KDF_R_MISSING_MESSAGE_DIGEST);
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return 0;
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}
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if (impl->key == NULL) {
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KDFerr(KDF_F_KDF_HKDF_DERIVE, KDF_R_MISSING_KEY);
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return 0;
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}
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switch (impl->mode) {
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case EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND:
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return HKDF(impl->md, impl->salt, impl->salt_len, impl->key,
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impl->key_len, impl->info, impl->info_len, key,
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keylen);
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case EVP_KDF_HKDF_MODE_EXTRACT_ONLY:
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return HKDF_Extract(impl->md, impl->salt, impl->salt_len, impl->key,
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impl->key_len, key, keylen);
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case EVP_KDF_HKDF_MODE_EXPAND_ONLY:
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return HKDF_Expand(impl->md, impl->key, impl->key_len, impl->info,
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impl->info_len, key, keylen);
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default:
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return 0;
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}
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}
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const EVP_KDF_METHOD hkdf_kdf_meth = {
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EVP_KDF_HKDF,
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kdf_hkdf_new,
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kdf_hkdf_free,
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kdf_hkdf_reset,
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kdf_hkdf_ctrl,
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kdf_hkdf_ctrl_str,
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kdf_hkdf_size,
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kdf_hkdf_derive
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};
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static int HKDF(const EVP_MD *evp_md,
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const unsigned char *salt, size_t salt_len,
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const unsigned char *key, size_t key_len,
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const unsigned char *info, size_t info_len,
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unsigned char *okm, size_t okm_len)
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{
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unsigned char prk[EVP_MAX_MD_SIZE];
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int ret;
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size_t prk_len = EVP_MD_size(evp_md);
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if (!HKDF_Extract(evp_md, salt, salt_len, key, key_len, prk, prk_len))
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return 0;
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ret = HKDF_Expand(evp_md, prk, prk_len, info, info_len, okm, okm_len);
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OPENSSL_cleanse(prk, sizeof(prk));
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return ret;
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}
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static int HKDF_Extract(const EVP_MD *evp_md,
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const unsigned char *salt, size_t salt_len,
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const unsigned char *key, size_t key_len,
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unsigned char *prk, size_t prk_len)
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{
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if (prk_len != (size_t)EVP_MD_size(evp_md)) {
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KDFerr(KDF_F_HKDF_EXTRACT, KDF_R_WRONG_OUTPUT_BUFFER_SIZE);
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return 0;
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}
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return HMAC(evp_md, salt, salt_len, key, key_len, prk, NULL) != NULL;
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}
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static int HKDF_Expand(const EVP_MD *evp_md,
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const unsigned char *prk, size_t prk_len,
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const unsigned char *info, size_t info_len,
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unsigned char *okm, size_t okm_len)
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{
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HMAC_CTX *hmac;
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int ret = 0;
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unsigned int i;
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unsigned char prev[EVP_MAX_MD_SIZE];
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size_t done_len = 0, dig_len = EVP_MD_size(evp_md);
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size_t n = okm_len / dig_len;
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if (okm_len % dig_len)
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n++;
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if (n > 255 || okm == NULL)
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return 0;
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if ((hmac = HMAC_CTX_new()) == NULL)
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return 0;
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if (!HMAC_Init_ex(hmac, prk, prk_len, evp_md, NULL))
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goto err;
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for (i = 1; i <= n; i++) {
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size_t copy_len;
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const unsigned char ctr = i;
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if (i > 1) {
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if (!HMAC_Init_ex(hmac, NULL, 0, NULL, NULL))
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goto err;
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if (!HMAC_Update(hmac, prev, dig_len))
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goto err;
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}
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if (!HMAC_Update(hmac, info, info_len))
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goto err;
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if (!HMAC_Update(hmac, &ctr, 1))
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goto err;
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if (!HMAC_Final(hmac, prev, NULL))
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goto err;
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copy_len = (done_len + dig_len > okm_len) ?
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okm_len - done_len :
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dig_len;
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memcpy(okm + done_len, prev, copy_len);
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done_len += copy_len;
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}
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ret = 1;
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err:
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OPENSSL_cleanse(prev, sizeof(prev));
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HMAC_CTX_free(hmac);
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return ret;
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}
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