mbedtls: add digest shim layer for MbedTLS

Implement digest shim layer on top of MbedTLS crypto library.
Introduce <alg>_MBEDTLS kconfig for MbedTLS crypto implementations.

Signed-off-by: Raymond Mao <raymond.mao@linaro.org>

include/u-boot/sha1.h

@@ -41,6 +41,10 @@ extern "C" {
 
 #define SHA1_DEF_CHUNK_SZ 0x10000
 
+#define K_IPAD_VAL 0x36
+#define K_OPAD_VAL 0x5C
+#define K_PAD_LEN 64
+
 extern const uint8_t sha1_der_prefix[];
 
 #if defined(CONFIG_MBEDTLS_LIB_CRYPTO)

lib/mbedtls/Kconfig

@@ -134,10 +134,100 @@ config MBEDTLS_LIB_CRYPTO_ALT
 
 config MBEDTLS_LIB_CRYPTO
 	bool "MbedTLS crypto libraries"
+	select MD5_MBEDTLS if MD5
+	select SHA1_MBEDTLS if SHA1
+	select SHA256_MBEDTLS if SHA256
+	select SHA512_MBEDTLS if SHA512
+	select SHA384_MBEDTLS if SHA384
+	select SPL_MD5_MBEDTLS if SPL_MD5
+	select SPL_SHA1_MBEDTLS if SPL_SHA1
+	select SPL_SHA256_MBEDTLS if SPL_SHA256
+	select SPL_SHA512_MBEDTLS if SPL_SHA512
+	select SPL_SHA384_MBEDTLS if SPL_SHA384
 	help
 	  Enable MbedTLS crypto libraries.
 	  Mutually incompatible with MBEDTLS_LIB_CRYPTO_ALT.
 
+if MBEDTLS_LIB_CRYPTO
+
+config SHA1_MBEDTLS
+	bool "Enable SHA1 support with MbedTLS crypto library"
+	depends on MBEDTLS_LIB_CRYPTO && SHA1
+	help
+	  This option enables support of hashing using SHA1 algorithm
+	  with MbedTLS crypto library.
+
+config SHA256_MBEDTLS
+	bool "Enable SHA256 support with MbedTLS crypto library"
+	depends on MBEDTLS_LIB_CRYPTO && SHA256
+	help
+	  This option enables support of hashing using SHA256 algorithm
+	  with MbedTLS crypto library.
+
+config SHA512_MBEDTLS
+	bool "Enable SHA512 support with MbedTLS crypto library"
+	depends on MBEDTLS_LIB_CRYPTO && SHA512
+	default y if TI_SECURE_DEVICE && FIT_SIGNATURE
+	help
+	  This option enables support of hashing using SHA512 algorithm
+	  with MbedTLS crypto library.
+
+config SHA384_MBEDTLS
+	bool "Enable SHA384 support with MbedTLS crypto library"
+	depends on MBEDTLS_LIB_CRYPTO && SHA384
+	select SHA512_MBEDTLS
+	help
+	  This option enables support of hashing using SHA384 algorithm
+	  with MbedTLS crypto library.
+
+config MD5_MBEDTLS
+	bool "Enable MD5 support with MbedTLS crypto library"
+	depends on MBEDTLS_LIB_CRYPTO && MD5
+	help
+	  This option enables support of hashing using MD5 algorithm
+	  with MbedTLS crypto library.
+
+if SPL
+
+config SPL_SHA1_MBEDTLS
+	bool "Enable SHA1 support in SPL with MbedTLS crypto library"
+	depends on MBEDTLS_LIB_CRYPTO && SPL_SHA1
+	help
+	  This option enables support of hashing using SHA1 algorithm
+	  with MbedTLS crypto library.
+
+config SPL_SHA256_MBEDTLS
+	bool "Enable SHA256 support in SPL with MbedTLS crypto library"
+	depends on MBEDTLS_LIB_CRYPTO && SPL_SHA256
+	help
+	  This option enables support of hashing using SHA256 algorithm
+	  with MbedTLS crypto library.
+
+config SPL_SHA512_MBEDTLS
+	bool "Enable SHA512 support in SPL with MbedTLS crypto library"
+	depends on MBEDTLS_LIB_CRYPTO && SPL_SHA512
+	help
+	  This option enables support of hashing using SHA512 algorithm
+	  with MbedTLS crypto library.
+
+config SPL_SHA384_MBEDTLS
+	bool "Enable SHA384 support in SPL with MbedTLS crypto library"
+	depends on MBEDTLS_LIB_CRYPTO && SPL_SHA384
+	select SPL_SHA512
+	help
+	  This option enables support of hashing using SHA384 algorithm
+	  with MbedTLS crypto library.
+
+config SPL_MD5_MBEDTLS
+	bool "Enable MD5 support in SPL with MbedTLS crypto library"
+	depends on MBEDTLS_LIB_CRYPTO && SPL_MD5
+	help
+	  This option enables support of hashing using MD5 algorithm
+	  with MbedTLS crypto library.
+
+endif # SPL
+
+endif # MBEDTLS_LIB_CRYPTO
 
 config MBEDTLS_LIB_X509
 	bool "MbedTLS certificate libraries"

lib/mbedtls/Makefile

@@ -5,17 +5,23 @@
 
 MBEDTLS_LIB_DIR = external/mbedtls/library
 
+# shim layer for hash
+obj-$(CONFIG_$(SPL_)MD5_MBEDTLS) += md5.o
+obj-$(CONFIG_$(SPL_)SHA1_MBEDTLS) += sha1.o
+obj-$(CONFIG_$(SPL_)SHA256_MBEDTLS) += sha256.o
+obj-$(CONFIG_$(SPL_)SHA512_MBEDTLS) += sha512.o
+
 # MbedTLS crypto library
 obj-$(CONFIG_MBEDTLS_LIB) += mbedtls_lib_crypto.o
 mbedtls_lib_crypto-y := \
 	$(MBEDTLS_LIB_DIR)/platform_util.o \
 	$(MBEDTLS_LIB_DIR)/constant_time.o \
 	$(MBEDTLS_LIB_DIR)/md.o
-mbedtls_lib_crypto-$(CONFIG_$(SPL_)MD5) += $(MBEDTLS_LIB_DIR)/md5.o
-mbedtls_lib_crypto-$(CONFIG_$(SPL_)SHA1) += $(MBEDTLS_LIB_DIR)/sha1.o
-mbedtls_lib_crypto-$(CONFIG_$(SPL_)SHA256) += \
+mbedtls_lib_crypto-$(CONFIG_$(SPL_)MD5_MBEDTLS) += $(MBEDTLS_LIB_DIR)/md5.o
+mbedtls_lib_crypto-$(CONFIG_$(SPL_)SHA1_MBEDTLS) += $(MBEDTLS_LIB_DIR)/sha1.o
+mbedtls_lib_crypto-$(CONFIG_$(SPL_)SHA256_MBEDTLS) += \
 	$(MBEDTLS_LIB_DIR)/sha256.o
-mbedtls_lib_crypto-$(CONFIG_$(SPL_)SHA512) += \
+mbedtls_lib_crypto-$(CONFIG_$(SPL_)SHA512_MBEDTLS) += \
 	$(MBEDTLS_LIB_DIR)/sha512.o
 
 # MbedTLS X509 library

lib/mbedtls/md5.c

@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hash shim layer on MbedTLS Crypto library
+ *
+ * Copyright (c) 2024 Linaro Limited
+ * Author: Raymond Mao <raymond.mao@linaro.org>
+ */
+#include "compiler.h"
+
+#ifndef USE_HOSTCC
+#include <watchdog.h>
+#endif /* USE_HOSTCC */
+#include <u-boot/md5.h>
+
+void MD5Init(MD5Context *ctx)
+{
+	mbedtls_md5_init(ctx);
+	mbedtls_md5_starts(ctx);
+}
+
+void MD5Update(MD5Context *ctx, unsigned char const *buf, unsigned int len)
+{
+	mbedtls_md5_update(ctx, buf, len);
+}
+
+void MD5Final(unsigned char digest[16], MD5Context *ctx)
+{
+	mbedtls_md5_finish(ctx, digest);
+	mbedtls_md5_free(ctx);
+}
+
+void md5_wd(const unsigned char *input, unsigned int len,
+	    unsigned char output[16], unsigned int chunk_sz)
+{
+	MD5Context context;
+
+	MD5Init(&context);
+
+	if (IS_ENABLED(CONFIG_HW_WATCHDOG) || IS_ENABLED(CONFIG_WATCHDOG)) {
+		const unsigned char *curr = input;
+		const unsigned char *end = input + len;
+		int chunk;
+
+		while (curr < end) {
+			chunk = end - curr;
+			if (chunk > chunk_sz)
+				chunk = chunk_sz;
+			MD5Update(&context, curr, chunk);
+			curr += chunk;
+			schedule();
+		}
+	} else {
+		MD5Update(&context, input, len);
+	}
+
+	MD5Final(output, &context);
+}

lib/mbedtls/sha1.c

@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hash shim layer on MbedTLS Crypto library
+ *
+ * Copyright (c) 2024 Linaro Limited
+ * Author: Raymond Mao <raymond.mao@linaro.org>
+ */
+#ifndef USE_HOSTCC
+#include <cyclic.h>
+#endif /* USE_HOSTCC */
+#include <string.h>
+#include <u-boot/sha1.h>
+
+const u8 sha1_der_prefix[SHA1_DER_LEN] = {
+	0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e,
+	0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14
+};
+
+void sha1_starts(sha1_context *ctx)
+{
+	mbedtls_sha1_init(ctx);
+	mbedtls_sha1_starts(ctx);
+}
+
+void sha1_update(sha1_context *ctx, const unsigned char *input,
+		 unsigned int length)
+{
+	mbedtls_sha1_update(ctx, input, length);
+}
+
+void sha1_finish(sha1_context *ctx, unsigned char output[SHA1_SUM_LEN])
+{
+	mbedtls_sha1_finish(ctx, output);
+	mbedtls_sha1_free(ctx);
+}
+
+void sha1_csum_wd(const unsigned char *input, unsigned int ilen,
+		  unsigned char *output, unsigned int chunk_sz)
+{
+	sha1_context ctx;
+
+	sha1_starts(&ctx);
+
+	if (IS_ENABLED(CONFIG_HW_WATCHDOG) || IS_ENABLED(CONFIG_WATCHDOG)) {
+		const unsigned char *curr = input;
+		const unsigned char *end = input + ilen;
+		int chunk;
+
+		while (curr < end) {
+			chunk = end - curr;
+			if (chunk > chunk_sz)
+				chunk = chunk_sz;
+			sha1_update(&ctx, curr, chunk);
+			curr += chunk;
+			schedule();
+		}
+	} else {
+		sha1_update(&ctx, input, ilen);
+	}
+
+	sha1_finish(&ctx, output);
+}
+
+void sha1_hmac(const unsigned char *key, int keylen,
+	       const unsigned char *input, unsigned int ilen,
+	       unsigned char *output)
+{
+	int i;
+	sha1_context ctx;
+	unsigned char k_ipad[K_PAD_LEN];
+	unsigned char k_opad[K_PAD_LEN];
+	unsigned char tmpbuf[20];
+
+	if (keylen > K_PAD_LEN)
+		return;
+
+	memset(k_ipad, K_IPAD_VAL, sizeof(k_ipad));
+	memset(k_opad, K_OPAD_VAL, sizeof(k_opad));
+
+	for (i = 0; i < keylen; i++) {
+		k_ipad[i] ^= key[i];
+		k_opad[i] ^= key[i];
+	}
+
+	sha1_starts(&ctx);
+	sha1_update(&ctx, k_ipad, sizeof(k_ipad));
+	sha1_update(&ctx, input, ilen);
+	sha1_finish(&ctx, tmpbuf);
+
+	sha1_starts(&ctx);
+	sha1_update(&ctx, k_opad, sizeof(k_opad));
+	sha1_update(&ctx, tmpbuf, sizeof(tmpbuf));
+	sha1_finish(&ctx, output);
+
+	memset(k_ipad, 0, sizeof(k_ipad));
+	memset(k_opad, 0, sizeof(k_opad));
+	memset(tmpbuf, 0, sizeof(tmpbuf));
+	memset(&ctx, 0, sizeof(sha1_context));
+}

lib/mbedtls/sha256.c

@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hash shim layer on MbedTLS Crypto library
+ *
+ * Copyright (c) 2024 Linaro Limited
+ * Author: Raymond Mao <raymond.mao@linaro.org>
+ */
+#ifndef USE_HOSTCC
+#include <cyclic.h>
+#endif /* USE_HOSTCC */
+#include <u-boot/sha256.h>
+
+const u8 sha256_der_prefix[SHA256_DER_LEN] = {
+	0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
+	0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05,
+	0x00, 0x04, 0x20
+};
+
+void sha256_starts(sha256_context *ctx)
+{
+	mbedtls_sha256_init(ctx);
+	mbedtls_sha256_starts(ctx, 0);
+}
+
+void
+sha256_update(sha256_context *ctx, const uint8_t *input, uint32_t length)
+{
+	mbedtls_sha256_update(ctx, input, length);
+}
+
+void sha256_finish(sha256_context *ctx, uint8_t digest[SHA256_SUM_LEN])
+{
+	mbedtls_sha256_finish(ctx, digest);
+	mbedtls_sha256_free(ctx);
+}
+
+void sha256_csum_wd(const unsigned char *input, unsigned int ilen,
+		    unsigned char *output, unsigned int chunk_sz)
+{
+	sha256_context ctx;
+
+	sha256_starts(&ctx);
+
+	if (IS_ENABLED(CONFIG_HW_WATCHDOG) || IS_ENABLED(CONFIG_WATCHDOG)) {
+		const unsigned char *curr = input;
+		const unsigned char *end = input + ilen;
+		int chunk;
+
+		while (curr < end) {
+			chunk = end - curr;
+			if (chunk > chunk_sz)
+				chunk = chunk_sz;
+			sha256_update(&ctx, curr, chunk);
+			curr += chunk;
+			schedule();
+		}
+	} else {
+		sha256_update(&ctx, input, ilen);
+	}
+
+	sha256_finish(&ctx, output);
+}

lib/mbedtls/sha512.c

@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hash shim layer on MbedTLS Crypto library
+ *
+ * Copyright (c) 2024 Linaro Limited
+ * Author: Raymond Mao <raymond.mao@linaro.org>
+ */
+#ifndef USE_HOSTCC
+#include <cyclic.h>
+#endif /* USE_HOSTCC */
+#include <compiler.h>
+#include <u-boot/sha512.h>
+
+const u8 sha384_der_prefix[SHA384_DER_LEN] = {
+	0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
+	0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05,
+	0x00, 0x04, 0x30
+};
+
+const u8 sha512_der_prefix[SHA512_DER_LEN] = {
+	0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
+	0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05,
+	0x00, 0x04, 0x40
+};
+
+void sha384_starts(sha512_context *ctx)
+{
+	mbedtls_sha512_init(ctx);
+	mbedtls_sha512_starts(ctx, 1);
+}
+
+void
+sha384_update(sha512_context *ctx, const uint8_t *input, uint32_t length)
+{
+	mbedtls_sha512_update(ctx, input, length);
+}
+
+void sha384_finish(sha512_context *ctx, uint8_t digest[SHA384_SUM_LEN])
+{
+	mbedtls_sha512_finish(ctx, digest);
+	mbedtls_sha512_free(ctx);
+}
+
+void sha384_csum_wd(const unsigned char *input, unsigned int length,
+		    unsigned char *output, unsigned int chunk_sz)
+{
+	mbedtls_sha512(input, length, output, 1);
+}
+
+void sha512_starts(sha512_context *ctx)
+{
+	mbedtls_sha512_init(ctx);
+	mbedtls_sha512_starts(ctx, 0);
+}
+
+void
+sha512_update(sha512_context *ctx, const uint8_t *input, uint32_t length)
+{
+	mbedtls_sha512_update(ctx, input, length);
+}
+
+void sha512_finish(sha512_context *ctx, uint8_t digest[SHA512_SUM_LEN])
+{
+	mbedtls_sha512_finish(ctx, digest);
+	mbedtls_sha512_free(ctx);
+}
+
+void sha512_csum_wd(const unsigned char *input, unsigned int ilen,
+		    unsigned char *output, unsigned int chunk_sz)
+{
+	sha512_context ctx;
+
+	sha512_starts(&ctx);
+
+	if (IS_ENABLED(CONFIG_HW_WATCHDOG) || IS_ENABLED(CONFIG_WATCHDOG)) {
+		const unsigned char *curr = input;
+		const unsigned char *end = input + ilen;
+		int chunk;
+
+		while (curr < end) {
+			chunk = end - curr;
+			if (chunk > chunk_sz)
+				chunk = chunk_sz;
+			sha512_update(&ctx, curr, chunk);
+			curr += chunk;
+			schedule();
+		}
+	} else {
+		sha512_update(&ctx, input, ilen);
+	}
+
+	sha512_finish(&ctx, output);
+}