Add ML-DSA support.

.github/workflows/test-renode-nrf52.yml

@@ -80,6 +80,10 @@ jobs:
       - name: Renode Tests ext_XMSS-SHA2_10_256
         run: ./tools/renode/docker-test.sh "SIGN=ext_XMSS XMSS_PARAMS='XMSS-SHA2_10_256' WOLFBOOT_SMALL_STACK=0 IMAGE_SIGNATURE_SIZE=2500 IMAGE_HEADER_SIZE=5000"
 
+# ML-DSA TEST
+      - name: Renode Tests ML-DSA-44
+        run: ./tools/renode/docker-test.sh "SIGN=ML_DSA ML_DSA_LEVEL=2 WOLFBOOT_SMALL_STACK=0 IMAGE_SIGNATURE_SIZE=2420 IMAGE_HEADER_SIZE=4840"
+
 
       - name: Upload Output Dir
         uses: actions/upload-artifact@v3

config/examples/sim-ml-dsa.config

@@ -0,0 +1,63 @@
+# ML-DSA signature example, based on sim.config example.
+#
+# The acceptable parameter values are those in FIPS 204:
+#
+#   ML_DSA_LEVEL = {2, 3, 5}
+#
+# This corresponds to these security levels (from FIPS 204, Table 1.):
+#
+#               Claimed Security Strength
+#   ML-DSA-44      Category 2
+#   ML-DSA-65      Category 3
+#   ML-DSA-87      Category 5
+#
+# The signature, pub key, and priv key lengths are all a function
+# of this parameter. Refer to this table (from FIPS 204, Table 2.)
+# to configure your IMAGE_SIGNATURE_SIZE:
+#
+#   Table 2. Sizes (in bytes) of keys and signatures of ML-DSA
+#
+#               Private Key   Public Key   Signature Size
+#   ML-DSA-44      2560          1312         2420
+#   ML-DSA-65      4032          1952         3309
+#   ML-DSA-87      4896          2592         4627
+#
+
+ARCH=sim
+TARGET=sim
+SIGN?=ML_DSA
+HASH?=SHA256
+WOLFBOOT_SMALL_STACK=0
+SPI_FLASH=0
+DEBUG=0
+DELTA_UPDATES=0
+
+#
+# ML-DSA config examples:
+#
+# Category 2:
+ML_DSA_LEVEL=2
+IMAGE_SIGNATURE_SIZE=2420
+IMAGE_HEADER_SIZE?=4840
+#
+# Category 3:
+# ML_DSA_LEVEL=3
+# IMAGE_SIGNATURE_SIZE=3309
+# IMAGE_HEADER_SIZE?=6618
+#
+# Category 5:
+# ML_DSA_LEVEL=5
+# IMAGE_SIGNATURE_SIZE=4627
+# IMAGE_HEADER_SIZE?=9254
+#
+
+# sizes should be multiple of system page size
+WOLFBOOT_PARTITION_SIZE=0x40000
+WOLFBOOT_SECTOR_SIZE=0x1000
+WOLFBOOT_PARTITION_BOOT_ADDRESS=0x20000
+# if on external flash, it should be multiple of system page size
+WOLFBOOT_PARTITION_UPDATE_ADDRESS=0x60000
+WOLFBOOT_PARTITION_SWAP_ADDRESS=0xA0000
+
+# required for keytools
+WOLFBOOT_FIXED_PARTITIONS=1

docs/PQ.md

@@ -1,8 +1,90 @@
 # Post-Quantum Signatures
 
-wolfBoot is adding support for post-quantum signatures. At present, support
-for LMS/HSS (https://www.rfc-editor.org/rfc/rfc8554.html), and XMSS/XMSS^MT
-(https://www.rfc-editor.org/rfc/rfc8391.html) has been added.
+wolfBoot is continuously adding support for post-quantum (PQ) signature
+algorithms as they mature. At present, support has been added for three NIST
+approved PQ signature algorithms:
+
+- ML-DSA: https://csrc.nist.gov/pubs/fips/204/final
+- LMS/HSS: https://csrc.nist.gov/projects/stateful-hash-based-signatures
+- XMSS/XMSS^MT: https://csrc.nist.gov/projects/stateful-hash-based-signatures
+
+ML-DSA is a PQ lattice-based algorithm, derived from
+CRYSTALS-DILITHIUM (a round three NIST finalist).
+
+LMS/HSS and XMSS/XMSS^MT are both PQ stateful hash-based signature (HBS)
+schemes, recommended in NIST SP 800-208.
+
+In terms of relative tradeoffs:
+- All three methods have fast verifying operations.
+- All three methods have variable length signature sizes.
+- ML-DSA key generation is much faster than LMS/HSS and XMSS/XMSS^MT.
+- ML-DSA public keys are larger than LMS/HSS and XMSS/XMSS^MT, and
+  variable sized.
+- LMS/HSS and XMSS/XMSS^MT have stateful private keys, which requires
+  more care with key generation and signing operations.
+
+See these config files for simulated target examples:
+
+- `config/examples/sim-ml-dsa.config`
+- `config/examples/sim-lms.config`
+- `config/examples/sim-xmss.config`
+
+## Lattice Based Signature Methods
+
+### ML-DSA
+
+ML-DSA (Module-Lattice Digital Signature Algorithm) was standardized in
+FIPS 204 (https://csrc.nist.gov/pubs/fips/204/final), based on its
+round 3 predecessor CRYSTALS-DILITHIUM.
+
+ML-DSA has three standardized parameter sets:
+
+- `ML-DSA-44`
+- `ML-DSA-65`
+- `ML-DSA-87`
+
+The numerical suffix (44, 65, 87) denotes the dimension of the matrix used
+in the underlying lattice construction.
+
+The private key, public key, signature size, and overall security strength
+all depend on the parameter set:
+
+```
+#
+#               Private Key   Public Key   Signature Size   Security Strength
+#   ML-DSA-44      2560          1312         2420            Category 2
+#   ML-DSA-65      4032          1952         3309            Category 3
+#   ML-DSA-87      4896          2592         4627            Category 5
+#
+```
+
+### ML-DSA Config
+
+A new ML-DSA sim example has been added here:
+
+```
+config/examples/sim-ml-dsa.config
+```
+
+The security category level is configured with `ML_DSA_LEVEL=<num>`, where
+num = 2, 3, 5. Here is an example from the `sim-ml-dsa.config` for category
+2:
+
+```
+# ML-DSA config examples:
+#
+# Category 2:
+ML_DSA_LEVEL=2
+IMAGE_SIGNATURE_SIZE=2420
+IMAGE_HEADER_SIZE?=4840
+```
+
+Note: The wolfcrypt implementation of ML-DSA (dilithium) builds to the
+FIPS 204 final standard by default. If you wish to conform to the older
+FIPS 204 draft standard, then build with `WOLFSSL_DILITHIUM_FIPS204_DRAFT`
+instead.
+
+## Stateful Hash-Based Signature Methods
 
 LMS/HSS and XMSS/XMSS^MT are both post-quantum stateful hash-based signature
 (HBS) schemes. They are known for having small public keys, relatively fast
@@ -19,7 +101,7 @@ See these links for more info on stateful HBS support and wolfSSL/wolfCrypt:
 - https://www.wolfssl.com/documentation/manuals/wolfssl/appendix07.html#post-quantum-stateful-hash-based-signatures
 - https://github.com/wolfSSL/wolfssl-examples/tree/master/pq/stateful_hash_sig
 
-## Supported PQ Signature Methods
+### Supported PQ HBS Options
 
 These four PQ signature options are supported:
 - LMS: uses wolfcrypt implementation from `wc_lms.c`, and `wc_lms_impl.c`.

include/loader.h

@@ -61,15 +61,18 @@ extern "C" {
     extern const unsigned char rsa4096_pub_key[];
     extern unsigned int rsa4096_pub_key_len;
 #   define IMAGE_SIGNATURE_SIZE (512)
+/* In PQC methods the signature size is a function of
+ * the parameters. Therefore IMAGE_SIGNATURE_SIZE is
+ * set in options.mk from the .config file. */
 #elif defined(WOLFBOOT_SIGN_LMS)
-    /* Because signature size in LMS is function of
-     * LMS variables, IMAGE_SIGNATURE_SIZE is set in
-     * options.mk from the .config file. */
     extern const unsigned char lms_pub_key[];
     extern unsigned int lms_pub_key_len;
 #elif defined(WOLFBOOT_SIGN_XMSS)
     extern const unsigned char xmss_pub_key[];
     extern unsigned int xmss_pub_key_len;
+#elif defined(WOLFBOOT_SIGN_ML_DSA)
+    extern const unsigned char ml_dsa_pub_key[];
+    extern unsigned int ml_dsa_pub_key_len;
 #elif !defined(WOLFBOOT_NO_SIGN)
 #   error "No public key available for given signing algorithm."
 #endif /* Algorithm selection */

include/user_settings.h

@@ -227,6 +227,29 @@ extern int tolower(int c);
 #   define NO_RSA
 #endif /* RSA */
 
+/* ML-DSA (dilithium) */
+#if defined(WOLFBOOT_SIGN_ML_DSA)
+#   define HAVE_DILITHIUM
+#   define WOLFSSL_WC_DILITHIUM
+#   define WOLFSSL_EXPERIMENTAL_SETTINGS
+    /* Wolfcrypt builds ML-DSA (dilithium) to the FIPS 204 final
+     * standard by default. Uncomment this if you want the draft
+     * version instead. */
+    #if 0
+    #define WOLFSSL_DILITHIUM_FIPS204_DRAFT
+    #endif
+#   define WOLFSSL_DILITHIUM_VERIFY_ONLY
+#   define WOLFSSL_DILITHIUM_NO_LARGE_CODE
+#   define WOLFSSL_DILITHIUM_SMALL
+#   define WOLFSSL_DILITHIUM_VERIFY_SMALL_MEM
+#   define WOLFSSL_DILITHIUM_VERIFY_NO_MALLOC
+#   define WOLFSSL_DILITHIUM_NO_ASN1
+    /* dilithium needs these sha functions. */
+#   define WOLFSSL_SHA3
+#   define WOLFSSL_SHAKE256
+#   define WOLFSSL_SHAKE128
+#endif /* WOLFBOOT_SIGN_ML_DSA */
+
 #ifdef WOLFBOOT_HASH_SHA3_384
 #   define WOLFSSL_SHA3
 #   if defined(NO_RSA) && !defined(WOLFBOOT_TPM) && \

include/wolfboot/wolfboot.h

@@ -86,6 +86,7 @@ extern "C" {
 #define AUTH_KEY_RSA3072 0x08
 #define AUTH_KEY_LMS     0x09
 #define AUTH_KEY_XMSS    0x10
+#define AUTH_KEY_ML_DSA  0x11
 
 
 
@@ -107,6 +108,7 @@ extern "C" {
 #define HDR_IMG_TYPE_AUTH_RSA3072 (AUTH_KEY_RSA3072 << 8)
 #define HDR_IMG_TYPE_AUTH_LMS     (AUTH_KEY_LMS     << 8)
 #define HDR_IMG_TYPE_AUTH_XMSS    (AUTH_KEY_XMSS    << 8)
+#define HDR_IMG_TYPE_AUTH_ML_DSA  (AUTH_KEY_ML_DSA  << 8)
 
 #define HDR_IMG_TYPE_DIFF         0x00D0
 
@@ -125,6 +127,22 @@ extern "C" {
  #define KEYSTORE_PUBKEY_SIZE_RSA4096 576
  #define KEYSTORE_PUBKEY_SIZE_LMS     60
  #define KEYSTORE_PUBKEY_SIZE_XMSS    68
+ /* ML-DSA pub key size is a function of parameters.
+  * This needs to be configurable. Default to security
+  * category 2. */
+ #ifdef ML_DSA_LEVEL
+     #if ML_DSA_LEVEL == 2
+         #define KEYSTORE_PUBKEY_SIZE_ML_DSA  1312
+     #elif ML_DSA_LEVEL == 3
+         #define KEYSTORE_PUBKEY_SIZE_ML_DSA  1952
+     #elif ML_DSA_LEVEL == 5
+         #define KEYSTORE_PUBKEY_SIZE_ML_DSA  2592
+     #else
+         #error "Invalid ML_DSA_LEVEL!"
+     #endif
+ #else
+     #define KEYSTORE_PUBKEY_SIZE_ML_DSA  1312
+ #endif /* ML_DSA_LEVEL */
 
 /* Mask for key permissions */
  #define KEY_VERIFY_ALL         (0xFFFFFFFFU)
@@ -235,6 +253,11 @@ extern "C" {
  #   ifndef WOLFBOOT_UNIVERSAL_KEYSTORE
  #     define KEYSTORE_PUBKEY_SIZE KEYSTORE_PUBKEY_SIZE_XMSS
  #   endif
+ #elif defined(WOLFBOOT_SIGN_ML_DSA)
+ #   define HDR_IMG_TYPE_AUTH HDR_IMG_TYPE_AUTH_ML_DSA
+ #   ifndef WOLFBOOT_UNIVERSAL_KEYSTORE
+ #     define KEYSTORE_PUBKEY_SIZE KEYSTORE_PUBKEY_SIZE_ML_DSA
+ #   endif
  #else
  #   error "No valid authentication mechanism selected. " \
            "Please select a valid SIGN= option."

options.mk

@@ -487,6 +487,26 @@ ifneq (,$(filter $(SIGN), ext_LMS ext_XMSS))
   CFLAGS  +=-DWOLFSSL_EXPERIMENTAL_SETTINGS
 endif
 
+ifeq ($(SIGN),ML_DSA)
+  # Use wolfcrypt ML-DSA dilithium implementation.
+  KEYGEN_OPTIONS+=--ml_dsa
+  SIGN_OPTIONS+=--ml_dsa
+  WOLFCRYPT_OBJS+= \
+    ./lib/wolfssl/wolfcrypt/src/dilithium.o \
+    ./lib/wolfssl/wolfcrypt/src/memory.o \
+    ./lib/wolfssl/wolfcrypt/src/sha3.o \
+    ./lib/wolfssl/wolfcrypt/src/wc_port.o \
+    ./lib/wolfssl/wolfcrypt/src/hash.o
+  CFLAGS+=-D"WOLFBOOT_SIGN_ML_DSA" \
+          -D"IMAGE_SIGNATURE_SIZE"=$(IMAGE_SIGNATURE_SIZE) \
+          -D"ML_DSA_LEVEL"=$(ML_DSA_LEVEL)
+  ifeq ($(WOLFBOOT_SMALL_STACK),1)
+    $(error WOLFBOOT_SMALL_STACK with ML-DSA not supported yet)
+  else
+    STACK_USAGE=19544
+  endif
+endif
+
 ifeq ($(RAM_CODE),1)
   CFLAGS+= -D"RAM_CODE"
 endif