51 lines
1.9 KiB
C
51 lines
1.9 KiB
C
#ifndef P2PRNG_H
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#define P2PRNG_H
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#include <stdint.h>
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// # generate random number and mac
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// IS should include all peers participating, ideally with a unique id
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//
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// usage example:
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// uint8_t self_rng[P2PRNG_LEN];
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// uint8_t self_key[P2PRNG_MAC_KEY_LEN];
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// p2prng_gen_and_auth(self_rng, self_key, self_mac, is, is_len);
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// // wait for all other macs to arrive <here>
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// for (int i = 0; i < peer_count; i++) {
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// if (p2prng_auth_verify(peer_mac_key[i], peer_mac[i], peer_msgs[i], peer_msg_len[i]) != 0) {
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// // validation error, optionally rerequest
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// exit(1);
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// }
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// }
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// // proceed with rng combining
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// # combine the random numbers and IS
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// call with IS last
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//
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// usage example:
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// uint8_t final_hash[P2PRNG_COMBINE_LEN];
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// p2prng_combine_init(final_hash, peer_msgs[0], peer_msg_len[0]);
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// for (int i = 1; i < peer_count; i++) {
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// p2prng_combine_update(final_hash, final_hash, peer_msgs[i], peer_msg_len[i]);
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// }
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// p2prng_combine_update(final_hash, final_hash, is, is_len);
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#define P2PRNG_LEN 32u
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#define P2PRNG_MAC_KEY_LEN 32u
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#define P2PRNG_MAC_LEN 32u
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#define P2PRNG_COMBINE_LEN 32u
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// TODO: merge key into msg
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int p2prng_auth_create(uint8_t out_key[P2PRNG_MAC_KEY_LEN], uint8_t out_mac[P2PRNG_MAC_LEN], const uint8_t* msg, uint32_t msg_len);
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int p2prng_auth_verify(const uint8_t key[P2PRNG_MAC_KEY_LEN], const uint8_t mac[P2PRNG_MAC_LEN], const uint8_t* msg, uint32_t msg_len);
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int p2prng_combine_init(uint8_t out_hash[P2PRNG_COMBINE_LEN], const uint8_t* msg, uint32_t msg_len);
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int p2prng_combine_update(uint8_t out_hash[P2PRNG_COMBINE_LEN], const uint8_t prev_hash[P2PRNG_COMBINE_LEN], const uint8_t* msg, uint32_t msg_len);
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// helper that:
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// - generates the random number (msg)
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// - calls p2prng_auth_create()
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int p2prng_gen_and_auth(uint8_t out_rng[P2PRNG_LEN], uint8_t out_key[P2PRNG_MAC_KEY_LEN], uint8_t out_mac[P2PRNG_MAC_LEN], const uint8_t* is, uint32_t is_len);
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#endif // P2PRNG_H
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