21 lines
641 B
C
21 lines
641 B
C
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int
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hydro_kdf_derive_from_key(uint8_t *subkey, size_t subkey_len, uint64_t subkey_id,
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const char ctx[hydro_kdf_CONTEXTBYTES],
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const uint8_t key[hydro_kdf_KEYBYTES])
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{
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hydro_hash_state st;
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COMPILER_ASSERT(hydro_kdf_CONTEXTBYTES >= hydro_hash_CONTEXTBYTES);
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COMPILER_ASSERT(hydro_kdf_KEYBYTES >= hydro_hash_KEYBYTES);
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if (hydro_hash_init_with_tweak(&st, ctx, subkey_id, key) != 0) {
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return -1;
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}
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return hydro_hash_final(&st, subkey, subkey_len);
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}
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void
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hydro_kdf_keygen(uint8_t key[hydro_kdf_KEYBYTES])
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{
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hydro_random_buf(key, hydro_kdf_KEYBYTES);
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}
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