mirror of
https://github.com/irungentoo/toxcore.git
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36 lines
907 B
C
36 lines
907 B
C
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#include "crypto_block.h"
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#include "crypto_uint64.h"
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#include "uint64_unpack.h"
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#include "uint64_pack.h"
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/*
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TEA with double-size words.
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XXX: Switch to crypto_block_aes256.
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XXX: Build crypto_stream_aes256 on top of crypto_block_aes256.
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*/
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int crypto_block(
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unsigned char *out,
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const unsigned char *in,
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const unsigned char *k
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)
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{
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crypto_uint64 v0 = uint64_unpack(in + 0);
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crypto_uint64 v1 = uint64_unpack(in + 8);
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crypto_uint64 k0 = uint64_unpack(k + 0);
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crypto_uint64 k1 = uint64_unpack(k + 8);
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crypto_uint64 k2 = uint64_unpack(k + 16);
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crypto_uint64 k3 = uint64_unpack(k + 24);
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crypto_uint64 sum = 0;
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crypto_uint64 delta = 0x9e3779b97f4a7c15;
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int i;
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for (i = 0;i < 32;++i) {
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sum += delta;
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v0 += ((v1<<7) + k0) ^ (v1 + sum) ^ ((v1>>12) + k1);
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v1 += ((v0<<16) + k2) ^ (v0 + sum) ^ ((v0>>8) + k3);
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}
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uint64_pack(out + 0,v0);
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uint64_pack(out + 8,v1);
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return 0;
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}
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