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>
diff --git a/lib/mbedtls/sha1.c b/lib/mbedtls/sha1.c
new file mode 100644
index 0000000..2aee503
--- /dev/null
+++ b/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));
+}