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198 lines
6.3 KiB
198 lines
6.3 KiB
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Common functions between firmware and kernel verified boot.
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*/
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#ifndef VBOOT_REFERENCE_VBOOT_2COMMON_H_
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#define VBOOT_REFERENCE_VBOOT_2COMMON_H_
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#include "2api.h"
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#include "2return_codes.h"
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#include "2sha.h"
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#include "2struct.h"
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struct vb2_public_key;
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/*
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* Return the greater of A and B. This is used in macros which calculate the
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* required buffer size, so can't be turned into a static inline function.
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*/
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#ifndef VB2_MAX
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#define VB2_MAX(A, B) ((A) > (B) ? (A) : (B))
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#endif
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/* Return the number of elements in an array */
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#ifndef ARRAY_SIZE
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#define ARRAY_SIZE(array) (sizeof(array)/sizeof(array[0]))
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#endif
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/* Debug output printf() for tests. Otherwise, it's platform-dependent. */
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#if defined(VBOOT_DEBUG)
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# if defined(FOR_TEST)
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# define VB2_DEBUG(format, args...) printf(format, ## args)
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# else
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# define VB2_DEBUG(format, args...) vb2ex_printf(__func__, format, ## args)
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# endif
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#else
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# define VB2_DEBUG(format, args...)
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#endif
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/*
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* Alignment for work buffer pointers/allocations should be useful for any
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* data type. When declaring workbuf buffers on the stack, the caller should
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* use explicit alignment to avoid run-time errors. For example:
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*
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* int foo(void)
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* {
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* struct vb2_workbuf wb;
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* uint8_t buf[NUM] __attribute__ ((aligned (VB2_WORKBUF_ALIGN)));
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* wb.buf = buf;
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* wb.size = sizeof(buf);
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*/
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/* We might get away with using __alignof__(void *), but since GCC defines a
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* macro for us we'll be safe and use that. */
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#define VB2_WORKBUF_ALIGN __BIGGEST_ALIGNMENT__
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/* Work buffer */
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struct vb2_workbuf {
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uint8_t *buf;
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uint32_t size;
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};
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/**
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* Initialize a work buffer.
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*
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* @param wb Work buffer to init
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* @param buf Pointer to work buffer data
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* @param size Size of work buffer data in bytes
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*/
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void vb2_workbuf_init(struct vb2_workbuf *wb, uint8_t *buf, uint32_t size);
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/**
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* Allocate space in a work buffer.
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*
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* Note that the returned buffer will always be aligned to VB2_WORKBUF_ALIGN.
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*
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* The work buffer acts like a stack, and detailed tracking of allocs and frees
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* is not done. The caller must track the size of each allocation and free via
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* vb2_workbuf_free() in the reverse order they were allocated.
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*
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* An acceptable alternate workflow inside a function is to pass in a const
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* work buffer, then make a local copy. Allocations done to the local copy
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* then don't change the passed-in work buffer, and will effectively be freed
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* when the local copy goes out of scope.
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*
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* @param wb Work buffer
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* @param size Requested size in bytes
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* @return A pointer to the allocated space, or NULL if error.
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*/
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void *vb2_workbuf_alloc(struct vb2_workbuf *wb, uint32_t size);
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/**
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* Reallocate space in a work buffer.
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*
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* Note that the returned buffer will always be aligned to VB2_WORKBUF_ALIGN.
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* The work buffer acts like a stack, so this must only be done to the most
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* recently allocated buffer.
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*
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* @param wb Work buffer
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* @param oldsize Old allocation size in bytes
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* @param newsize Requested size in bytes
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* @return A pointer to the allocated space, or NULL if error.
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*/
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void *vb2_workbuf_realloc(struct vb2_workbuf *wb,
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uint32_t oldsize,
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uint32_t newsize);
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/**
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* Free the preceding allocation.
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*
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* Note that the work buffer acts like a stack, and detailed tracking of
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* allocs and frees is not done. The caller must track the size of each
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* allocation and free them in reverse order.
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*
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* @param wb Work buffer
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* @param size Size of data to free
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*/
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void vb2_workbuf_free(struct vb2_workbuf *wb, uint32_t size);
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/* Check if a pointer is aligned on an align-byte boundary */
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#define vb2_aligned(ptr, align) (!(((uintptr_t)(ptr)) & ((align) - 1)))
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/**
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* Safer memcmp() for use in crypto.
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*
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* Compares the buffers to see if they are equal. Time taken to perform
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* the comparison is dependent only on the size, not the relationship of
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* the match between the buffers. Note that unlike memcmp(), this only
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* indicates inequality, not which buffer is lesser.
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*
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* @param s1 First buffer
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* @param s2 Second buffer
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* @param size Number of bytes to compare
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* @return 0 if match or size=0, non-zero if at least one byte mismatched.
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*/
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int vb2_safe_memcmp(const void *s1, const void *s2, size_t size);
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/**
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* Align a buffer and check its size.
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*
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* @param **ptr Pointer to pointer to align
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* @param *size Points to size of buffer pointed to by *ptr
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* @param align Required alignment (must be power of 2)
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* @param want_size Required size
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* @return VB2_SUCCESS, or non-zero if error.
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*/
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int vb2_align(uint8_t **ptr,
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uint32_t *size,
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uint32_t align,
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uint32_t want_size);
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/**
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* Return offset of ptr from base.
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*
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* @param base Base pointer
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* @param ptr Pointer at some offset from base
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* @return The offset of ptr from base.
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*/
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ptrdiff_t vb2_offset_of(const void *base, const void *ptr);
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/**
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* Return expected signature size for a signature/hash algorithm pair
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*
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* @param sig_alg Signature algorithm
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* @param hash_alg Hash algorithm
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* @return The signature size, or zero if error / unsupported algorithm.
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*/
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uint32_t vb2_sig_size(enum vb2_signature_algorithm sig_alg,
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enum vb2_hash_algorithm hash_alg);
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/**
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* Return a key guid for an unsigned hash algorithm.
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*
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* @param hash_alg Hash algorithm to return key for
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* @return A pointer to the key guid for that hash algorithm and
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* sig_alg=VB2_SIG_NONE, or NULL if error.
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*/
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const struct vb2_guid *vb2_hash_guid(enum vb2_hash_algorithm hash_alg);
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/* Size of work buffer sufficient for vb2_verify_digest() worst case. */
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#define VB2_VERIFY_DIGEST_WORKBUF_BYTES VB2_VERIFY_RSA_DIGEST_WORKBUF_BYTES
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/* Size of work buffer sufficient for vb2_verify_data() worst case. */
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#define VB2_VERIFY_DATA_WORKBUF_BYTES \
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(VB2_SHA512_DIGEST_SIZE + \
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VB2_MAX(VB2_VERIFY_DIGEST_WORKBUF_BYTES, \
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sizeof(struct vb2_digest_context)))
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/* Size of work buffer sufficient for vb2_verify_keyblock() worst case. */
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#define VB2_KEY_BLOCK_VERIFY_WORKBUF_BYTES VB2_VERIFY_DATA_WORKBUF_BYTES
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/* Size of work buffer sufficient for vb2_verify_fw_preamble() worst case. */
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#define VB2_VERIFY_FIRMWARE_PREAMBLE_WORKBUF_BYTES VB2_VERIFY_DATA_WORKBUF_BYTES
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#endif /* VBOOT_REFERENCE_VBOOT_2COMMON_H_ */
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