diff --git a/boot/zephyr/CMakeLists.txt b/boot/zephyr/CMakeLists.txt
index 9a69279..15c2ece 100644
--- a/boot/zephyr/CMakeLists.txt
+++ b/boot/zephyr/CMakeLists.txt
@@ -89,6 +89,7 @@
 target_sources(app PRIVATE "${BOOT_DIR}/bootutil/src/loader.c")
 target_sources(app PRIVATE "${BOOT_DIR}/bootutil/src/bootutil_misc.c")
 target_sources(app PRIVATE "${BOOT_DIR}/bootutil/src/image_validate.c")
+target_sources(app PRIVATE "${BOOT_DIR}/bootutil/src/encrypted.c")
 target_sources(app PRIVATE "${BOOT_DIR}/bootutil/src/image_rsa.c")
 target_sources(app PRIVATE "${BOOT_DIR}/bootutil/src/image_ec256.c")
 target_sources(app PRIVATE "${BOOT_DIR}/bootutil/src/caps.c")
diff --git a/boot/zephyr/Kconfig b/boot/zephyr/Kconfig
index 31c78a1..3502481 100644
--- a/boot/zephyr/Kconfig
+++ b/boot/zephyr/Kconfig
@@ -66,6 +66,14 @@
 	  swapping them.  This prevents the fallback recovery, but
 	  uses a much simpler code path.
 
+config BOOT_ENCRYPT_RSA
+	bool "Support for encrypted upgrade images"
+	default n
+	help
+	  If y, images in slot 1 can be encrypted and are decrypted
+	  on the fly when upgrading to slot 0, as well as encrypted
+	  back when swapping from slot 0 to slot 1.
+
 config BOOT_MAX_IMG_SECTORS
 	int "Maximum number of sectors per image slot"
 	default 128
diff --git a/boot/zephyr/include/config-rsa.h b/boot/zephyr/include/config-rsa.h
index c6fa05a..d27acf9 100644
--- a/boot/zephyr/include/config-rsa.h
+++ b/boot/zephyr/include/config-rsa.h
@@ -58,6 +58,7 @@
 #define MBEDTLS_MD_C
 #define MBEDTLS_OID_C
 #define MBEDTLS_SHA256_C
+#define MBEDTLS_AES_C
 
 /* Save RAM by adjusting to our exact needs */
 #define MBEDTLS_ECP_MAX_BITS             2048
diff --git a/boot/zephyr/include/mcuboot_config/mcuboot_config.h b/boot/zephyr/include/mcuboot_config/mcuboot_config.h
index 97a0f85..c85da47 100644
--- a/boot/zephyr/include/mcuboot_config/mcuboot_config.h
+++ b/boot/zephyr/include/mcuboot_config/mcuboot_config.h
@@ -43,6 +43,11 @@
 #define MCUBOOT_HAVE_LOGGING 1
 #endif
 
+#ifdef CONFIG_BOOT_ENCRYPT_RSA
+#define MCUBOOT_ENC_IMAGES
+#define MCUBOOT_ENCRYPT_RSA
+#endif
+
 /*
  * Enabling this option uses newer flash map APIs. This saves RAM and
  * avoids deprecated API usage.
diff --git a/boot/zephyr/keys.c b/boot/zephyr/keys.c
index 9e660d8..d59afdb 100644
--- a/boot/zephyr/keys.c
+++ b/boot/zephyr/keys.c
@@ -59,3 +59,116 @@
 };
 const int bootutil_key_cnt = 1;
 #endif
+
+#if defined(MCUBOOT_ENCRYPT_RSA)
+unsigned char enc_priv_key[] = {
+  0x30, 0x82, 0x04, 0xa4, 0x02, 0x01, 0x00, 0x02, 0x82, 0x01, 0x01, 0x00,
+  0xb4, 0x26, 0x14, 0x49, 0x3d, 0x16, 0x13, 0x3a, 0x6d, 0x9c, 0x84, 0xa9,
+  0x8b, 0x6a, 0x10, 0x20, 0x61, 0xef, 0x48, 0x04, 0xa4, 0x4b, 0x24, 0xf3,
+  0x00, 0x32, 0xac, 0x22, 0xe0, 0x30, 0x27, 0x70, 0x18, 0xe5, 0x55, 0xc8,
+  0xb8, 0x05, 0x34, 0x03, 0xb0, 0xf8, 0xa5, 0x96, 0xd2, 0x48, 0x58, 0xef,
+  0x70, 0xb0, 0x09, 0xdb, 0xe3, 0x58, 0x62, 0xef, 0x99, 0x63, 0x01, 0xb2,
+  0x89, 0xc4, 0xb3, 0xf6, 0x9e, 0x62, 0xbf, 0x4d, 0xc2, 0x8a, 0xd0, 0xc9,
+  0x4d, 0x43, 0xa3, 0xd8, 0xe5, 0x1d, 0xec, 0x62, 0x63, 0x08, 0xe2, 0x20,
+  0xa5, 0xfc, 0x78, 0xd0, 0x3e, 0x74, 0xc8, 0xa4, 0x1b, 0x36, 0xad, 0x7b,
+  0xf5, 0x06, 0xae, 0x4d, 0x51, 0x9b, 0x40, 0xce, 0x30, 0x4f, 0x6c, 0xea,
+  0xf9, 0xe9, 0x74, 0xea, 0x06, 0xee, 0x9c, 0xe4, 0x14, 0x68, 0x20, 0xb9,
+  0x3d, 0xe7, 0x11, 0x14, 0x8b, 0x25, 0xa3, 0xff, 0x4c, 0x8a, 0xf3, 0x53,
+  0xee, 0x6b, 0x3e, 0xef, 0x34, 0xcd, 0x6a, 0x3f, 0x62, 0x68, 0xc0, 0xff,
+  0x78, 0x4c, 0xb0, 0xc3, 0xe6, 0x96, 0x61, 0xfc, 0x1f, 0x18, 0xf1, 0x7a,
+  0x82, 0xe2, 0x8f, 0x35, 0xa8, 0x2b, 0x86, 0x16, 0xa4, 0x46, 0xfb, 0xac,
+  0x7e, 0x41, 0xdb, 0x02, 0x05, 0x91, 0x6d, 0xdf, 0xc1, 0xde, 0x13, 0x95,
+  0x9c, 0xf9, 0x9e, 0x5e, 0x72, 0xba, 0xa7, 0x25, 0x93, 0xfb, 0xdc, 0xe8,
+  0xab, 0x86, 0x45, 0x88, 0x47, 0x2d, 0xed, 0xee, 0xee, 0x97, 0x9e, 0xce,
+  0x5d, 0x9b, 0x04, 0x04, 0x40, 0x7c, 0xcb, 0x7c, 0x3d, 0x2c, 0x74, 0xab,
+  0xa4, 0xcc, 0x64, 0xa3, 0x5c, 0x95, 0x3d, 0xd4, 0xa2, 0xdc, 0x92, 0xb2,
+  0xc8, 0x18, 0xcb, 0xf9, 0x00, 0x39, 0x81, 0x8f, 0x8f, 0x40, 0xc2, 0xdf,
+  0x99, 0x29, 0xac, 0x8a, 0xc2, 0x3b, 0xd8, 0xa4, 0xf2, 0xad, 0xaf, 0x74,
+  0xc0, 0x11, 0xc7, 0x99, 0x02, 0x03, 0x01, 0x00, 0x01, 0x02, 0x82, 0x01,
+  0x00, 0x42, 0x47, 0x80, 0x4f, 0x31, 0xda, 0x5d, 0x58, 0xb1, 0xdb, 0x54,
+  0x33, 0xcc, 0xc7, 0x49, 0x07, 0xa1, 0x00, 0x98, 0x4e, 0x9c, 0xe3, 0xc8,
+  0xc4, 0x5e, 0xde, 0x45, 0xd6, 0xcf, 0x04, 0xe8, 0x7d, 0xa5, 0xab, 0x3a,
+  0xd4, 0x8e, 0x5f, 0xdb, 0xb3, 0x3f, 0xf9, 0x3b, 0x73, 0x32, 0x0a, 0xcc,
+  0x2d, 0xcc, 0x17, 0xf8, 0x88, 0x9e, 0x2c, 0x76, 0xba, 0x10, 0x85, 0x0c,
+  0xaa, 0xd3, 0x65, 0x3b, 0x91, 0x10, 0xd4, 0xe3, 0xed, 0x88, 0x15, 0xea,
+  0x9b, 0x25, 0x82, 0x2d, 0x56, 0x2f, 0x75, 0xc2, 0xf2, 0xaf, 0xdd, 0x24,
+  0xd5, 0x3e, 0x3c, 0x95, 0x76, 0x88, 0x84, 0x0f, 0x0d, 0xd1, 0xb5, 0x5c,
+  0x3e, 0xae, 0xf7, 0xb6, 0x49, 0x5c, 0x2c, 0xf2, 0xba, 0xe9, 0xab, 0x4f,
+  0x37, 0x64, 0x9b, 0x30, 0x18, 0xaa, 0x54, 0x40, 0x04, 0xea, 0x3d, 0x25,
+  0x4d, 0x02, 0x29, 0x71, 0x6f, 0x4d, 0x82, 0x9b, 0xc3, 0x44, 0x2a, 0x9d,
+  0x0c, 0x98, 0xd3, 0xc8, 0x15, 0x0d, 0x04, 0x93, 0x60, 0x30, 0xc7, 0x5e,
+  0x79, 0xea, 0x53, 0x9d, 0xc0, 0x0e, 0x81, 0xac, 0x90, 0xbc, 0x9e, 0x1e,
+  0xd2, 0x28, 0x0f, 0x10, 0xf5, 0x1f, 0xdf, 0x38, 0x7f, 0x8a, 0x90, 0x8d,
+  0x49, 0x07, 0x7d, 0x78, 0xcb, 0xa7, 0xef, 0x92, 0x6d, 0x3b, 0x13, 0x95,
+  0x9b, 0xba, 0x83, 0xc6, 0xb3, 0x71, 0x25, 0x27, 0x07, 0x99, 0x54, 0x82,
+  0x3d, 0xec, 0xc5, 0xf8, 0xb4, 0xa0, 0x38, 0x7a, 0x59, 0x6a, 0x0b, 0xca,
+  0x69, 0x6c, 0x17, 0xa4, 0x18, 0xe0, 0xb4, 0xaa, 0x89, 0x99, 0x8f, 0xcb,
+  0x71, 0x34, 0x09, 0x1b, 0x6e, 0xe6, 0x87, 0x00, 0xb5, 0xba, 0x70, 0x8a,
+  0x29, 0x3d, 0x9a, 0x06, 0x18, 0x2d, 0x66, 0x5e, 0x61, 0x37, 0xeb, 0xdd,
+  0x5e, 0xc8, 0x28, 0x92, 0x05, 0x30, 0xfd, 0xb8, 0x65, 0xb1, 0x7f, 0xbf,
+  0x2d, 0x55, 0x12, 0x91, 0xc1, 0x02, 0x81, 0x81, 0x00, 0xda, 0x65, 0xda,
+  0x38, 0x7c, 0x18, 0xfb, 0x00, 0x11, 0x60, 0xeb, 0x37, 0x65, 0xb8, 0x83,
+  0x62, 0x88, 0xc4, 0x3a, 0x4e, 0x64, 0x6a, 0xf3, 0x3e, 0x4e, 0xc0, 0x34,
+  0x19, 0x8a, 0xcb, 0x4a, 0xca, 0x2f, 0x5d, 0x50, 0x7a, 0xac, 0xf7, 0x9e,
+  0x87, 0x5a, 0xfc, 0x4d, 0x49, 0xd7, 0xf9, 0x21, 0xf5, 0x0b, 0x6f, 0x57,
+  0x41, 0x3d, 0x8f, 0xb8, 0xec, 0x7f, 0xcc, 0x92, 0x09, 0xbe, 0xd3, 0xa4,
+  0xc3, 0x14, 0x85, 0x21, 0x5d, 0x05, 0xa3, 0xaa, 0x20, 0xf6, 0x62, 0x44,
+  0x50, 0x03, 0x5e, 0x53, 0x4a, 0xcd, 0x6a, 0xb6, 0x65, 0x8e, 0x4e, 0x4b,
+  0x3f, 0x25, 0xc6, 0x16, 0x31, 0xf5, 0x99, 0x13, 0x77, 0x42, 0xda, 0xdc,
+  0x70, 0x4d, 0x65, 0xb0, 0x99, 0x0f, 0xdf, 0x5a, 0xb1, 0x45, 0xf0, 0xb9,
+  0x8e, 0xa0, 0xae, 0x4f, 0x4d, 0x65, 0x09, 0x84, 0xb5, 0x38, 0x29, 0xbf,
+  0x69, 0xe0, 0x88, 0x1f, 0x27, 0x02, 0x81, 0x81, 0x00, 0xd3, 0x2a, 0x59,
+  0xec, 0x28, 0xc3, 0x0d, 0x4f, 0x92, 0x96, 0xca, 0x67, 0x94, 0xfc, 0x2e,
+  0xa6, 0x86, 0x68, 0x45, 0x53, 0x92, 0xcc, 0x86, 0x7f, 0x8a, 0xe1, 0x5d,
+  0xe8, 0x1d, 0x9e, 0xbb, 0x1e, 0x00, 0x26, 0x1d, 0x80, 0x12, 0xff, 0x9c,
+  0x11, 0x0a, 0xbd, 0xa6, 0xc3, 0x8d, 0x48, 0xda, 0xfc, 0x10, 0xf7, 0x7a,
+  0x16, 0x07, 0x15, 0xa0, 0x3a, 0xd3, 0x94, 0xfb, 0x52, 0x87, 0x39, 0xee,
+  0xe7, 0xc4, 0x26, 0x49, 0x16, 0xc6, 0xc0, 0x83, 0x25, 0xbf, 0x6a, 0x4e,
+  0x8c, 0x0b, 0x10, 0x85, 0x66, 0xab, 0x7e, 0xae, 0xac, 0x4c, 0x69, 0x3c,
+  0x44, 0xeb, 0xcd, 0xe9, 0xf6, 0x64, 0x8b, 0x4a, 0xd8, 0x6a, 0x4d, 0x6d,
+  0x47, 0xa9, 0xb8, 0x55, 0x72, 0xc1, 0xfd, 0xf4, 0x81, 0x4c, 0x66, 0xbe,
+  0x49, 0xf2, 0x75, 0x4f, 0x80, 0xf1, 0x20, 0x38, 0xb8, 0x6a, 0x1b, 0x75,
+  0x41, 0x30, 0x0f, 0x1b, 0x3f, 0x02, 0x81, 0x80, 0x09, 0x35, 0xfa, 0x7a,
+  0x1f, 0x61, 0xbe, 0x54, 0x46, 0x67, 0x5c, 0x04, 0x3e, 0x1a, 0x06, 0x10,
+  0x85, 0xcc, 0x20, 0xd9, 0x65, 0x8a, 0xcd, 0x2f, 0x77, 0x8a, 0xcb, 0xa7,
+  0xb8, 0x1e, 0xd2, 0xcc, 0xac, 0x2a, 0xb7, 0x56, 0x35, 0x2d, 0x4c, 0x56,
+  0x51, 0x14, 0x0a, 0xfe, 0x6e, 0x49, 0x67, 0x91, 0x3a, 0x26, 0x3b, 0xfb,
+  0xd8, 0x68, 0xd3, 0x57, 0xc6, 0x1c, 0x0e, 0x9c, 0xb2, 0x9b, 0xa2, 0x7b,
+  0x47, 0xc6, 0x45, 0x9d, 0xf2, 0xba, 0xf0, 0x55, 0xeb, 0x8e, 0x41, 0x6b,
+  0x4e, 0x79, 0x0f, 0xf2, 0x3b, 0xaf, 0xa0, 0x79, 0xb0, 0x02, 0xc5, 0x51,
+  0xa8, 0x7a, 0x2e, 0x3d, 0x75, 0x2a, 0x3b, 0x93, 0xf0, 0x11, 0xe2, 0xf2,
+  0x29, 0x91, 0x7c, 0x5d, 0x38, 0x3a, 0x27, 0x4d, 0x0a, 0xb2, 0x18, 0x61,
+  0x57, 0x8d, 0x82, 0x72, 0xb5, 0x2c, 0x2d, 0x98, 0xa7, 0x01, 0xbb, 0xbc,
+  0xef, 0x67, 0x4e, 0x49, 0x02, 0x81, 0x81, 0x00, 0xb2, 0x70, 0x53, 0x54,
+  0x70, 0x8d, 0x82, 0xad, 0xff, 0x1d, 0x55, 0x24, 0x7a, 0x8d, 0x2f, 0x8e,
+  0xa0, 0x7d, 0x74, 0x37, 0xcf, 0x10, 0xed, 0x86, 0xd1, 0x80, 0xe7, 0xad,
+  0xc1, 0x79, 0xe4, 0x7c, 0xd1, 0x7b, 0x63, 0xea, 0x5a, 0x23, 0x8d, 0x6a,
+  0x09, 0x3d, 0x81, 0xb2, 0x35, 0xad, 0x9e, 0xfe, 0xea, 0x07, 0x76, 0x2f,
+  0x2f, 0x05, 0x63, 0x44, 0xd2, 0x8e, 0x4e, 0x61, 0xca, 0xcb, 0x75, 0xca,
+  0x7b, 0xc2, 0x2e, 0x79, 0x04, 0xb2, 0xa1, 0x20, 0x40, 0xc4, 0x40, 0x63,
+  0xae, 0xe5, 0xe3, 0x14, 0x83, 0x4e, 0xa5, 0xa4, 0x0b, 0x5d, 0xd2, 0x04,
+  0x1b, 0x8f, 0x01, 0x69, 0xa8, 0x44, 0xdc, 0x96, 0x4c, 0x1d, 0xe9, 0x7e,
+  0x69, 0x38, 0xcf, 0x5c, 0x0d, 0xf9, 0xdf, 0xa7, 0x73, 0x3c, 0x4f, 0x08,
+  0x85, 0xce, 0x03, 0xc4, 0xdd, 0xfd, 0x70, 0x70, 0xc5, 0x99, 0x36, 0x58,
+  0x43, 0x98, 0x40, 0x59, 0x02, 0x81, 0x81, 0x00, 0xd5, 0xaa, 0xfb, 0xec,
+  0x8d, 0xc6, 0xdd, 0xfa, 0x2b, 0x5a, 0x24, 0xd0, 0xda, 0x58, 0xbd, 0x87,
+  0x92, 0x1a, 0x29, 0x62, 0x13, 0x1d, 0x4b, 0x79, 0x1b, 0xbe, 0x79, 0x7d,
+  0xad, 0x79, 0xca, 0x17, 0x75, 0xda, 0xe8, 0x32, 0xe8, 0xa0, 0x9e, 0xa8,
+  0x77, 0x53, 0xac, 0x38, 0xd6, 0xeb, 0xe6, 0x22, 0x65, 0xc4, 0xaa, 0x4c,
+  0xc8, 0xd0, 0x33, 0x1a, 0x1e, 0xbe, 0xbd, 0x73, 0x09, 0x4a, 0xfa, 0x85,
+  0x5c, 0xf3, 0x0c, 0x9c, 0x81, 0x56, 0x30, 0xa7, 0xf7, 0x9b, 0xf4, 0x92,
+  0x9c, 0x6b, 0x93, 0x6a, 0x00, 0x33, 0xdc, 0x2f, 0x54, 0x1e, 0x78, 0xd4,
+  0x97, 0xec, 0x24, 0xa2, 0xdb, 0x3d, 0x03, 0x33, 0x09, 0xb2, 0x2c, 0x03,
+  0x05, 0x40, 0xde, 0x52, 0xf2, 0x9b, 0xfa, 0x00, 0x8d, 0x4b, 0xfe, 0x5b,
+  0x9b, 0x9c, 0x73, 0xad, 0xfb, 0x7a, 0x00, 0x42, 0x62, 0x9e, 0xa0, 0x95,
+  0x55, 0x50, 0x32, 0x87
+};
+static unsigned int enc_priv_key_len = 1192;
+
+const struct bootutil_key bootutil_enc_key = {
+    .key = enc_priv_key,
+    .len = &enc_priv_key_len,
+};
+#elif defined(MCUBOOT_ENCRYPT_KW)
+#error "Encrypted images with AES-KW is not implemented yet."
+#endif
diff --git a/boot/zephyr/prj.conf b/boot/zephyr/prj.conf
index aec69e8..11e778a 100644
--- a/boot/zephyr/prj.conf
+++ b/boot/zephyr/prj.conf
@@ -7,6 +7,8 @@
 CONFIG_MAIN_STACK_SIZE=10240
 CONFIG_MBEDTLS_CFG_FILE="mcuboot-mbedtls-cfg.h"
 
+CONFIG_BOOT_ENCRYPT_RSA=n
+
 ### Default to RSA
 CONFIG_BOOT_SIGNATURE_TYPE_RSA=y
 CONFIG_BOOT_SIGNATURE_TYPE_ECDSA_P256=n