[PATCH v3 06/25] mbedtls: add digest shim layer for MbedTLS

28 May 2024

Implement digest shim layer on top of MbedTLS crypto library.
Signed-off-by: Raymond Mao raymond.mao@linaro.org
---
Changes in v2
- Split the shim layer into separated files and use the original head
  files instead of creating new ones.
Changes in v3
- Refactored sha1_hmac and removed non-watchdog md5 function.
include/u-boot/sha1.h |   4 ++
 lib/mbedtls/Makefile  |   7 +++
 lib/mbedtls/md5.c     |  59 ++++++++++++++++++++++
 lib/mbedtls/sha1.c    | 111 ++++++++++++++++++++++++++++++++++++++++++
 lib/mbedtls/sha256.c  |  65 +++++++++++++++++++++++++
 lib/mbedtls/sha512.c  |  96 ++++++++++++++++++++++++++++++++++++
 6 files changed, 342 insertions(+)
 create mode 100644 lib/mbedtls/md5.c
 create mode 100644 lib/mbedtls/sha1.c
 create mode 100644 lib/mbedtls/sha256.c
 create mode 100644 lib/mbedtls/sha512.c

diff --git a/include/u-boot/sha1.h b/include/u-boot/sha1.h
index ee46fe947a0..6120284ad4f 100644
--- a/include/u-boot/sha1.h
+++ b/include/u-boot/sha1.h
@@ -37,6 +37,10 @@ extern "C" {
 #define SHA1_SUM_LEN	20
 #define SHA1_DER_LEN	15
+#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)
diff --git a/lib/mbedtls/Makefile b/lib/mbedtls/Makefile
index 85f0a3cfd07..b8eda9638f4 100644
--- a/lib/mbedtls/Makefile
+++ b/lib/mbedtls/Makefile
@@ -14,6 +14,13 @@ ccflags-y += \
    -I$(src)/external/mbedtls/library \
    # This line is intentionally left blank
+# shim layer for hash
+obj-$(CONFIG_MBEDTLS_LIB_CRYPTO) += hash_mbedtls.o
+hash_mbedtls-$(CONFIG_$(SPL_)MD5) += md5.o
+hash_mbedtls-$(CONFIG_$(SPL_)SHA1) += sha1.o
+hash_mbedtls-$(CONFIG_$(SPL_)SHA256) += sha256.o
+hash_mbedtls-$(CONFIG_$(SPL_)SHA512) += sha512.o
+
 obj-$(CONFIG_MBEDTLS_LIB_CRYPTO) += mbedtls_lib_crypto.o
 mbedtls_lib_crypto-y := \
    $(MBEDTLS_LIB_DIR)/aes.o \
diff --git a/lib/mbedtls/md5.c b/lib/mbedtls/md5.c
new file mode 100644
index 00000000000..aa8c159f66f
--- /dev/null
+++ b/lib/mbedtls/md5.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hash shim layer on MbedTLS Crypto library
+ *
+ * Copyright (c) 2023 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;
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	const unsigned char *end, *curr;
+	int chunk;
+#endif
+
+	MD5Init(&context);
+
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	curr = input;
+	end = input + len;
+	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);
+#endif
+
+	MD5Final(output, &context);
+}
diff --git a/lib/mbedtls/sha1.c b/lib/mbedtls/sha1.c
new file mode 100644
index 00000000000..3d863b2af7f
--- /dev/null
+++ b/lib/mbedtls/sha1.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hash shim layer on MbedTLS Crypto library
+ *
+ * Copyright (c) 2023 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(const unsigned char *input, unsigned int ilen,
+	       unsigned char *output)
+{
+	sha1_context ctx;
+
+	sha1_starts(&ctx);
+	sha1_update(&ctx, input, ilen);
+	sha1_finish(&ctx, output);
+}
+
+void sha1_csum_wd(const unsigned char *input, unsigned int ilen,
+		  unsigned char *output, unsigned int chunk_sz)
+{
+	sha1_context ctx;
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	const unsigned char *end, *curr;
+	int chunk;
+#endif
+
+	sha1_starts(&ctx);
+
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	curr = input;
+	end = input + ilen;
+	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);
+#endif
+
+	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));
+}
diff --git a/lib/mbedtls/sha256.c b/lib/mbedtls/sha256.c
new file mode 100644
index 00000000000..45f6c08c5f6
--- /dev/null
+++ b/lib/mbedtls/sha256.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hash shim layer on MbedTLS Crypto library
+ *
+ * Copyright (c) 2023 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;
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	const unsigned char *end;
+	unsigned char *curr;
+	int chunk;
+#endif
+
+	sha256_starts(&ctx);
+
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	curr = (unsigned char *)input;
+	end = input + ilen;
+	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);
+#endif
+
+	sha256_finish(&ctx, output);
+}
diff --git a/lib/mbedtls/sha512.c b/lib/mbedtls/sha512.c
new file mode 100644
index 00000000000..6f7f843b2b2
--- /dev/null
+++ b/lib/mbedtls/sha512.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hash shim layer on MbedTLS Crypto library
+ *
+ * Copyright (c) 2023 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;
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	const unsigned char *end;
+	unsigned char *curr;
+	int chunk;
+#endif
+
+	sha512_starts(&ctx);
+
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	curr = (unsigned char *)input;
+	end = input + ilen;
+	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);
+#endif
+
+	sha512_finish(&ctx, output);
+}
-- 
2.25.1


    