wolfCrypt as crypto backend for VeraCrypt (#1227)

* wolfCrypt as crypto backend for VeraCrypt

* Refactor to use EncryptionModeWolfCryptXTS class

src/Crypto/Aes.h

@@ -35,6 +35,11 @@
 
 #include "Common/Tcdefs.h"
 
+#ifdef WOLFCRYPT_BACKEND
+    #include <wolfssl/options.h>
+    #include <wolfssl/wolfcrypt/aes.h>
+#endif
+
 #ifndef EXIT_SUCCESS
 #define EXIT_SUCCESS    0
 #define EXIT_FAILURE    1
@@ -93,11 +98,19 @@ typedef union
 typedef struct
 {   uint_32t ks[KS_LENGTH];
     aes_inf inf;
+#ifdef WOLFCRYPT_BACKEND
+    XtsAes  wc_enc_xts;
+    Aes     wc_enc_aes;
+#endif
 } aes_encrypt_ctx;
 
 typedef struct
 {   uint_32t ks[KS_LENGTH];
     aes_inf inf;
+#ifdef WOLFCRYPT_BACKEND
+    XtsAes  wc_dec_xts;
+    Aes     wc_dec_aes;
+#endif
 } aes_decrypt_ctx;
 
 /* This routine must be called before first use if non-static       */
@@ -152,6 +165,13 @@ AES_RETURN aes_decrypt(const unsigned char *in, unsigned char *out, const aes_de
 
 #endif
 
+#ifdef WOLFCRYPT_BACKEND
+AES_RETURN xts_encrypt_key256(const unsigned char *key, aes_encrypt_ctx cx[1]);
+AES_RETURN xts_decrypt_key256(const unsigned char *key, aes_decrypt_ctx cx[1]);
+AES_RETURN xts_encrypt(const unsigned char *in, unsigned char *out, word64 length, word64 sector, const aes_encrypt_ctx cx[1]);
+AES_RETURN xts_decrypt(const unsigned char *in, unsigned char *out, word64 length, word64 sector, const aes_decrypt_ctx cx[1]);
+#endif
+
 #if defined(AES_MODES)
 
 /* Multiple calls to the following subroutines for multiple block   */

src/Crypto/Sha2.h

@@ -12,6 +12,13 @@
 #include "Common/Endian.h"
 #include "Crypto/config.h"
 
+#ifdef WOLFCRYPT_BACKEND
+    #include <wolfssl/options.h>
+    #include <wolfssl/wolfcrypt/sha256.h>
+    #include <wolfssl/wolfcrypt/sha512.h>
+    #include <wolfssl/wolfcrypt/hash.h>
+#endif
+
 #if defined(__cplusplus)
 extern "C" {
 #endif
@@ -28,6 +35,10 @@ extern "C" {
 #define SHA2_ALIGN	CRYPTOPP_ALIGN_DATA(16)
 #endif
 
+#ifdef WOLFCRYPT_BACKEND
+typedef struct wc_Sha512 sha512_ctx;
+typedef struct wc_Sha256 sha256_ctx;
+#else
 typedef struct
 {   uint_64t count[2];
     SHA2_ALIGN uint_64t hash[8];
@@ -39,6 +50,7 @@ typedef struct
     SHA2_ALIGN uint_32t hash[8];
     SHA2_ALIGN uint_32t wbuf[16];
 } sha256_ctx;
+#endif
 
 
 void sha512_begin(sha512_ctx* ctx);

src/Crypto/cpu.h

@@ -214,7 +214,7 @@ extern "C" {
 #endif
 
 #define CRYPTOPP_CPUID_AVAILABLE
-#ifndef CRYPTOPP_DISABLE_AESNI
+#if !defined(CRYPTOPP_DISABLE_AESNI) && !defined(WOLFCRYPT_BACKEND)
 #define TC_AES_HW_CPU
 #endif
 

src/Crypto/wolfCrypt.c

@@ -0,0 +1,243 @@
+/* See src/Crypto/wolfCrypt.md */
+
+#include "Aes.h"
+#include "Sha2.h"
+#include "../Common/Crypto.h"
+#include <wolfssl/wolfcrypt/hmac.h>
+
+
+AES_RETURN aes_init()
+{
+#if defined( AES_ERR_CHK )
+    return EXIT_SUCCESS;
+#else
+    return;
+#endif
+}
+
+AES_RETURN aes_encrypt_key(const unsigned char *key, int key_len, aes_encrypt_ctx cx[1])
+{
+    int ret = 0;
+
+    ret = wc_AesInit(&cx->wc_enc_aes, NULL, INVALID_DEVID);
+
+    if (key_len == 128 || key_len == 192 || key_len == 256)
+        key_len = key_len/8;
+
+    if (ret == 0) {
+        ret = wc_AesSetKey(&cx->wc_enc_aes, key, key_len, NULL, AES_ENCRYPTION);
+    }
+
+#if defined( AES_ERR_CHK )
+    return ret ? EXIT_FAILURE : EXIT_SUCCESS;
+#else
+    return;
+#endif
+}
+
+AES_RETURN aes_decrypt_key(const unsigned char *key, int key_len, aes_decrypt_ctx cx[1])
+{
+    int ret = 0;
+
+    ret = wc_AesInit(&cx->wc_dec_aes, NULL, INVALID_DEVID);
+
+    if (key_len == 128 || key_len == 192 || key_len == 256)
+        key_len = key_len/8;
+
+    if (ret == 0) {
+        ret = wc_AesSetKey(&cx->wc_dec_aes, key, key_len, NULL, AES_DECRYPTION);
+    }
+
+#if defined( AES_ERR_CHK )
+    return ret ? EXIT_FAILURE : EXIT_SUCCESS;
+#else
+    return;
+#endif
+}
+
+AES_RETURN aes_encrypt_key128(const unsigned char *key, aes_encrypt_ctx cx[1])
+{
+    return aes_encrypt_key(key, 128, cx);
+}
+
+AES_RETURN aes_encrypt_key192(const unsigned char *key, aes_encrypt_ctx cx[1])
+{
+    return aes_encrypt_key(key, 192, cx);
+}
+
+AES_RETURN aes_encrypt_key256(const unsigned char *key, aes_encrypt_ctx cx[1])
+{
+    return aes_encrypt_key(key, 256, cx);
+}
+
+AES_RETURN aes_decrypt_key128(const unsigned char *key, aes_decrypt_ctx cx[1])
+{
+    return aes_decrypt_key(key, 128, cx);
+}
+
+AES_RETURN aes_decrypt_key192(const unsigned char *key, aes_decrypt_ctx cx[1])
+{
+    return aes_decrypt_key(key, 192, cx);
+}
+
+AES_RETURN aes_decrypt_key256(const unsigned char *key, aes_decrypt_ctx cx[1])
+{
+    return aes_decrypt_key(key, 256, cx);
+}
+
+AES_RETURN aes_encrypt(const unsigned char *in, unsigned char *out, const aes_encrypt_ctx cx[1])
+{
+    int ret = wc_AesEncryptDirect(&cx->wc_enc_aes, out, in);
+#if defined( AES_ERR_CHK )
+    return ret ? EXIT_FAILURE : EXIT_SUCCESS;
+#else
+    return;
+#endif
+
+}
+
+AES_RETURN aes_decrypt(const unsigned char *in, unsigned char *out, const aes_decrypt_ctx cx[1])
+{
+    int ret = wc_AesDecryptDirect(&cx->wc_dec_aes, out, in);
+#if defined( AES_ERR_CHK )
+    return ret ? EXIT_FAILURE : EXIT_SUCCESS;
+#else
+    return;
+#endif
+
+}
+
+AES_RETURN xts_encrypt_key(const unsigned char *key, int key_len, aes_encrypt_ctx cx[1])
+{
+    int ret = 0;
+
+    cx->wc_enc_xts.aes = cx->wc_enc_aes;
+
+    ret = wc_AesInit(&cx->wc_enc_xts.tweak, NULL, INVALID_DEVID);
+
+    if (key_len == 128 || key_len == 192 || key_len == 256)
+        key_len = key_len/8;
+
+    if (ret == 0) {
+        ret = wc_AesSetKey(&cx->wc_enc_xts.tweak, key, key_len, NULL, AES_ENCRYPTION);
+    }
+#if defined( AES_ERR_CHK )
+    return ret ? EXIT_FAILURE : EXIT_SUCCESS;
+#else
+    return;
+#endif
+}
+
+AES_RETURN xts_decrypt_key(const unsigned char *key, int key_len, aes_decrypt_ctx cx[1])
+{
+    int ret = 0;
+
+    cx->wc_dec_xts.aes = cx->wc_dec_aes;
+
+    ret = wc_AesInit(&cx->wc_dec_xts.tweak, NULL, INVALID_DEVID);
+
+    if (key_len == 128 || key_len == 192 || key_len == 256)
+        key_len = key_len/8;
+
+    if (ret == 0) {
+        ret = wc_AesSetKey(&cx->wc_dec_xts.tweak, key, key_len, NULL, AES_ENCRYPTION);
+    }
+
+#if defined( AES_ERR_CHK )
+    return ret ? EXIT_FAILURE : EXIT_SUCCESS;
+#else
+    return;
+#endif
+}
+
+AES_RETURN xts_encrypt_key256(const unsigned char *key, aes_encrypt_ctx cx[1])
+{
+    return xts_encrypt_key(key, 256, cx);
+}
+
+AES_RETURN xts_decrypt_key256(const unsigned char *key, aes_decrypt_ctx cx[1])
+{
+    return xts_decrypt_key(key, 256, cx);
+}
+
+AES_RETURN xts_encrypt(const unsigned char *in, unsigned char *out, word64 length, word64 sector, const aes_encrypt_ctx cx[1])
+{
+    int ret = wc_AesXtsEncryptConsecutiveSectors(&cx->wc_enc_xts, out, in, length, sector, ENCRYPTION_DATA_UNIT_SIZE);
+
+#if defined( AES_ERR_CHK )
+    return ret ? EXIT_FAILURE : EXIT_SUCCESS;
+#else
+    return;
+#endif
+
+}
+
+AES_RETURN xts_decrypt(const unsigned char *in, unsigned char *out, word64 length, word64 sector, const aes_decrypt_ctx cx[1])
+{
+    int ret = wc_AesXtsDecryptConsecutiveSectors(&cx->wc_dec_xts, out, in, length, sector, ENCRYPTION_DATA_UNIT_SIZE);
+
+#if defined( AES_ERR_CHK )
+    return ret ? EXIT_FAILURE : EXIT_SUCCESS;
+#else
+    return;
+#endif
+}
+
+
+void sha256_begin(sha256_ctx* ctx)
+{
+    wc_InitSha256(ctx);
+}
+
+void sha256_hash(const unsigned char * source, uint_32t sourceLen, sha256_ctx *ctx)
+{
+    wc_Sha256Update(ctx, source, sourceLen);
+}
+
+void sha256_end(unsigned char * result, sha256_ctx* ctx)
+{
+    wc_Sha256Final(ctx, result);
+}
+
+void sha256(unsigned char * result, const unsigned char* source, uint_32t sourceLen)
+{
+    wc_Sha256 sha256;
+    wc_InitSha256(&sha256);
+    wc_Sha256Update(&sha256, source, sourceLen);
+    wc_Sha256Final(&sha256, result);
+    wc_Sha256Free(&sha256);
+}
+
+void sha512_begin(sha512_ctx* ctx)
+{
+    wc_InitSha512(ctx);
+}
+
+void sha512_hash(const unsigned char * source, uint_64t sourceLen, sha512_ctx *ctx)
+{
+    wc_Sha512Update(ctx, source, sourceLen);
+}
+
+void sha512_end(unsigned char * result, sha512_ctx* ctx)
+{
+    wc_Sha512Final(ctx, result);
+}
+
+void sha512(unsigned char * result, const unsigned char* source, uint_64t sourceLen)
+{
+    wc_Sha512 sha512;
+    wc_InitSha512(&sha512);
+    wc_Sha512Update(&sha512, source, sourceLen);
+    wc_Sha512Final(&sha512, result);
+    wc_Sha512Free(&sha512);
+}
+
+void derive_key_sha512 (char *pwd, int pwd_len, char *salt, int salt_len, uint32 iterations, char *dk, int dklen) {
+    (void) iterations;
+    wc_HKDF(WC_SHA512, (byte*)pwd, (word32)pwd_len, (byte*)salt, (word32)salt_len, NULL, 0, (byte*)dk, (word32)dklen);
+}
+
+void derive_key_sha256 (char *pwd, int pwd_len, char *salt, int salt_len, uint32 iterations, char *dk, int dklen) {
+    (void) iterations;
+    wc_HKDF(WC_SHA256, (byte*)pwd, (word32)pwd_len, (byte*)salt, (word32)salt_len, NULL, 0, (byte*)dk, (word32)dklen);
+}

src/Crypto/wolfCrypt.md

@@ -0,0 +1,25 @@
+# wolfSSL as crypto provider for VeraCrypt
+
+[wolfCrypt](https://www.wolfssl.com/products/wolfcrypt/) is wolfSSL's cutting edge crypto engine and a 
+potential FIPS solution for users of VeraCrypt. Follow the steps below to setup VeraCrypt with wolfCrypt. 
+
+## Building wolfSSL
+
+Clone wolfSSL and build it as shown below.
+
+```
+git clone https://github.com/wolfssl/wolfssl && cd wolfssl
+./autogen.sh
+./configure --enable-xts CFLAGS="-DNO_OLD_WC_NAMES"
+make
+sudo make install
+```
+
+## Building VeraCrypt with wolfSSL
+
+Build VeraCrypt with the `WOLFCRYPT` command line option.
+
+```
+make WXSTATIC=1 wxbuild && make WXSTATIC=1 clean && make WXSTATIC=1 WOLFCRYPT=1 && make WXSTATIC=1 WOLFCRYPT=1 package
+```
+