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5977867b68
Summary: Add a clib/sha1.h file with SHA-1 utility functions that hide the details of the underlying SHA-1 implementation being used. This will make it easier in the future if we want to use the faster SHA-1 implementation from OpenSSL if it is available, but fall back to the sha1collisiondetection library if it is not available. Test Plan: Confirmed the code builds and passes unit tests. Reviewers: #fbhgext, ryanmce Reviewed By: #fbhgext, ryanmce Differential Revision: https://phab.mercurial-scm.org/D282
36 lines
966 B
C
36 lines
966 B
C
// Copyright 2016-present Facebook. All Rights Reserved.
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//
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// checksum.c: implementation for recalculating the checksums for
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// intermediate nodes in a tree.
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//
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// no-check-code
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#include "clib/sha1.h"
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#include "node.h"
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#include "tree.h"
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static void update_checksum(node_t *node) {
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fbhg_sha1_ctx_t ctx;
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fbhg_sha1_init(&ctx);
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// find all the children and make sure their checksums are up-to-date.
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for (child_num_t ix = 0; ix < node->num_children; ix++) {
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node_t* child = get_child_by_index(node, ix);
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if (child->checksum_valid == false) {
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update_checksum(child);
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}
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fbhg_sha1_update(&ctx, child->name, child->name_sz);
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fbhg_sha1_update(&ctx, child->checksum, child->checksum_sz);
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fbhg_sha1_update(&ctx, &child->flags, 1);
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}
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fbhg_sha1_final(node->checksum, &ctx);
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node->checksum_sz = SHA1_BYTES;
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node->checksum_valid = true;
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}
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void update_checksums(tree_t *tree) {
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update_checksum(tree->shadow_root);
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}
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