49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
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// Package guts provides a low-level interface to the BLAKE3 cryptographic hash
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// function.
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package guts
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// Various constants.
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const (
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FlagChunkStart = 1 << iota
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FlagChunkEnd
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FlagParent
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FlagRoot
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FlagKeyedHash
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FlagDeriveKeyContext
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FlagDeriveKeyMaterial
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BlockSize = 64
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ChunkSize = 1024
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MaxSIMD = 16 // AVX-512 vectors can store 16 words
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)
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// IV is the BLAKE3 initialization vector.
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var IV = [8]uint32{
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0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
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0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19,
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}
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// A Node represents a chunk or parent in the BLAKE3 Merkle tree.
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type Node struct {
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CV [8]uint32 // chaining value from previous node
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Block [16]uint32
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Counter uint64
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BlockLen uint32
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Flags uint32
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}
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// ParentNode returns a Node that incorporates the chaining values of two child
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// nodes.
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func ParentNode(left, right [8]uint32, key *[8]uint32, flags uint32) Node {
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n := Node{
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CV: *key,
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Counter: 0, // counter is reset for parents
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BlockLen: BlockSize, // block is full
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Flags: flags | FlagParent,
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}
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copy(n.Block[:8], left[:])
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copy(n.Block[8:], right[:])
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return n
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}
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