avb2.0: add Android Verified Boot 2.0 library

Add libavb lib (3rd party library from AOSP), that implements support of
AVB 2.0. This library is used for integrity checking of Android partitions
on eMMC.

libavb was added as it is and minimal changes were introduced to reduce
maintenance cost, because it will be deviated from AOSP upstream in the future.

Changes:
- license headers changed to conform SPDX-style
- avb_crc32.c dropped
- updates in avb_sysdeps_posix.c/avb_sysdeps.h

For additional details check [1] AVB 2.0 README.

[1] https://android.googlesource.com/platform/external/avb/+/master/README.md

Signed-off-by: Igor Opaniuk <igor.opaniuk@linaro.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/lib/libavb/avb_sha.h b/lib/libavb/avb_sha.h
new file mode 100644
index 0000000000..f1d5f5af94
--- /dev/null
+++ b/lib/libavb/avb_sha.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * SPDX-License-Identifier:	MIT
+ */
+
+#ifdef AVB_INSIDE_LIBAVB_H
+#error "You can't include avb_sha.h in the public header libavb.h."
+#endif
+
+#ifndef AVB_COMPILATION
+#error "Never include this file, it may only be used from internal avb code."
+#endif
+
+#ifndef AVB_SHA_H_
+#define AVB_SHA_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "avb_crypto.h"
+#include "avb_sysdeps.h"
+
+/* Block size in bytes of a SHA-256 digest. */
+#define AVB_SHA256_BLOCK_SIZE 64
+
+
+/* Block size in bytes of a SHA-512 digest. */
+#define AVB_SHA512_BLOCK_SIZE 128
+
+/* Data structure used for SHA-256. */
+typedef struct {
+  uint32_t h[8];
+  uint32_t tot_len;
+  uint32_t len;
+  uint8_t block[2 * AVB_SHA256_BLOCK_SIZE];
+  uint8_t buf[AVB_SHA256_DIGEST_SIZE]; /* Used for storing the final digest. */
+} AvbSHA256Ctx;
+
+/* Data structure used for SHA-512. */
+typedef struct {
+  uint64_t h[8];
+  uint32_t tot_len;
+  uint32_t len;
+  uint8_t block[2 * AVB_SHA512_BLOCK_SIZE];
+  uint8_t buf[AVB_SHA512_DIGEST_SIZE]; /* Used for storing the final digest. */
+} AvbSHA512Ctx;
+
+/* Initializes the SHA-256 context. */
+void avb_sha256_init(AvbSHA256Ctx* ctx);
+
+/* Updates the SHA-256 context with |len| bytes from |data|. */
+void avb_sha256_update(AvbSHA256Ctx* ctx, const uint8_t* data, uint32_t len);
+
+/* Returns the SHA-256 digest. */
+uint8_t* avb_sha256_final(AvbSHA256Ctx* ctx) AVB_ATTR_WARN_UNUSED_RESULT;
+
+/* Initializes the SHA-512 context. */
+void avb_sha512_init(AvbSHA512Ctx* ctx);
+
+/* Updates the SHA-512 context with |len| bytes from |data|. */
+void avb_sha512_update(AvbSHA512Ctx* ctx, const uint8_t* data, uint32_t len);
+
+/* Returns the SHA-512 digest. */
+uint8_t* avb_sha512_final(AvbSHA512Ctx* ctx) AVB_ATTR_WARN_UNUSED_RESULT;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* AVB_SHA_H_ */