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108 lines
2.6 KiB
C++
108 lines
2.6 KiB
C++
// Based on public domain code written in 2012 by Samuel Neves
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#ifndef _RAR_BLAKE2_
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#define _RAR_BLAKE2_
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#define BLAKE2_DIGEST_SIZE 32
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#define BLAKE2_THREADS_NUMBER 8
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enum blake2s_constant
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{
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BLAKE2S_BLOCKBYTES = 64,
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BLAKE2S_OUTBYTES = 32
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};
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// Alignment to 64 improves performance of both SSE and non-SSE versions.
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// Alignment to n*16 is required for SSE version, so we selected 64.
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// We use the custom alignment scheme instead of __declspec(align(x)),
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// because it is less compiler dependent. Also the compiler directive
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// does not help if structure is a member of class allocated through
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// 'new' operator.
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struct blake2s_state
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{
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// Use constexpr instead of enums, because otherwise clang -std=c++20
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// issues a warning about "arithmetic between different enumeration types"
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// in ubuf[BLAKE_DATA_SIZE + BLAKE_ALIGNMENT] declaration.
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static constexpr size_t BLAKE_ALIGNMENT = 64;
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// buffer and uint32 h[8], t[2], f[2];
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// 2 * BLAKE2S_BLOCKBYTES is the buf size in blake2_code_20140114.zip.
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// It might differ in later versions.
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static constexpr size_t BLAKE_DATA_SIZE = 48 + 2 * BLAKE2S_BLOCKBYTES;
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byte ubuf[BLAKE_DATA_SIZE + BLAKE_ALIGNMENT];
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byte *buf; // byte buf[2 * BLAKE2S_BLOCKBYTES].
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uint32 *h, *t, *f; // uint32 h[8], t[2], f[2].
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size_t buflen;
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byte last_node;
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blake2s_state()
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{
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set_pointers();
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}
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// Required when we declare and assign in the same command.
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blake2s_state(blake2s_state &st)
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{
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set_pointers();
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*this=st;
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}
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void set_pointers()
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{
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// Set aligned pointers. Must be done in constructor, not in Init(),
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// so assignments like 'blake2sp_state res=blake2ctx' work correctly
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// even if blake2sp_init is not called for 'res'.
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buf = (byte *) ALIGN_VALUE(ubuf, BLAKE_ALIGNMENT);
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h = (uint32 *) (buf + 2 * BLAKE2S_BLOCKBYTES);
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t = h + 8;
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f = t + 2;
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}
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void init()
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{
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memset( ubuf, 0, sizeof( ubuf ) );
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buflen = 0;
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last_node = 0;
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}
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// Since we use pointers, the default = would work incorrectly.
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blake2s_state& operator = (blake2s_state &st)
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{
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if (this != &st)
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{
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memcpy(buf, st.buf, BLAKE_DATA_SIZE);
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buflen = st.buflen;
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last_node = st.last_node;
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}
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return *this;
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}
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};
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#ifdef RAR_SMP
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class ThreadPool;
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#endif
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struct blake2sp_state
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{
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blake2s_state S[8];
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blake2s_state R;
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byte buf[8 * BLAKE2S_BLOCKBYTES];
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size_t buflen;
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#ifdef RAR_SMP
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ThreadPool *ThPool;
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uint MaxThreads;
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#endif
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};
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void blake2sp_init( blake2sp_state *S );
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void blake2sp_update( blake2sp_state *S, const byte *in, size_t inlen );
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void blake2sp_final( blake2sp_state *S, byte *digest );
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#endif
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