OpenSSL: Implement aes_wrap/aes_unwrap through EVP for CONFIG_FIPS=y

The OpenSSL internal AES_wrap_key() and AES_unwrap_key() functions are
unfortunately not available in FIPS mode. Trying to use them results in
"aes_misc.c(83): OpenSSL internal error, assertion failed: Low level API
call to cipher AES forbidden in FIPS mode!" and process termination.
Work around this by reverting commit
f19c907822ad0dec3480b1435b615ae22c5533a1 ('OpenSSL: Implement aes_wrap()
and aes_unwrap()') changes for CONFIG_FIPS=y case. In practice, this
ends up using the internal AES key wrap/unwrap implementation through
the OpenSSL EVP API which is available in FIPS mode. When CONFIG_FIPS=y
is not used, the OpenSSL AES_wrap_key()/AES_unwrap_key() API continues
to be used to minimize code size.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/crypto/crypto_openssl.c

@@ -297,6 +297,8 @@ void aes_decrypt_deinit(void *ctx)
 }
 
 
+#ifndef CONFIG_FIPS
+
 int aes_wrap(const u8 *kek, size_t kek_len, int n, const u8 *plain, u8 *cipher)
 {
 	AES_KEY actx;
@@ -323,6 +325,8 @@ int aes_unwrap(const u8 *kek, size_t kek_len, int n, const u8 *cipher,
 	return res <= 0 ? -1 : 0;
 }
 
+#endif /* CONFIG_FIPS */
+
 
 int aes_128_cbc_encrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
 {

wpa_supplicant/Android.mk

@@ -1136,6 +1136,15 @@ AESOBJS += src/crypto/aes-internal.c src/crypto/aes-internal-dec.c
 endif
 
 ifneq ($(CONFIG_TLS), openssl)
+NEED_INTERNAL_AES_WRAP=y
+endif
+ifdef CONFIG_FIPS
+# Have to use internal AES key wrap routines to use OpenSSL EVP since the
+# OpenSSL AES_wrap_key()/AES_unwrap_key() API is not available in FIPS mode.
+NEED_INTERNAL_AES_WRAP=y
+endif
+
+ifdef NEED_INTERNAL_AES_WRAP
 AESOBJS += src/crypto/aes-unwrap.c
 endif
 ifdef NEED_AES_EAX
@@ -1158,7 +1167,7 @@ endif
 endif
 ifdef NEED_AES_WRAP
 NEED_AES_ENC=y
-ifneq ($(CONFIG_TLS), openssl)
+ifdef NEED_INTERNAL_AES_WRAP
 AESOBJS += src/crypto/aes-wrap.c
 endif
 endif

wpa_supplicant/Makefile

@@ -1148,6 +1148,15 @@ AESOBJS += ../src/crypto/aes-internal.o ../src/crypto/aes-internal-dec.o
 endif
 
 ifneq ($(CONFIG_TLS), openssl)
+NEED_INTERNAL_AES_WRAP=y
+endif
+ifdef CONFIG_FIPS
+# Have to use internal AES key wrap routines to use OpenSSL EVP since the
+# OpenSSL AES_wrap_key()/AES_unwrap_key() API is not available in FIPS mode.
+NEED_INTERNAL_AES_WRAP=y
+endif
+
+ifdef NEED_INTERNAL_AES_WRAP
 AESOBJS += ../src/crypto/aes-unwrap.o
 endif
 ifdef NEED_AES_EAX
@@ -1173,7 +1182,7 @@ AESOBJS += ../src/crypto/aes-siv.o
 endif
 ifdef NEED_AES_WRAP
 NEED_AES_ENC=y
-ifneq ($(CONFIG_TLS), openssl)
+ifdef NEED_INTERNAL_AES_WRAP
 AESOBJS += ../src/crypto/aes-wrap.o
 endif
 endif