61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
#ifndef __THREE_BEARS_PAPABEAREPHEM_H__
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#define __THREE_BEARS_PAPABEAREPHEM_H__
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#include <stddef.h> /* for size_t */
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#include <stdint.h>
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#define PAPABEAREPHEM_KEYGEN_SEED_BYTES 40
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#define PAPABEAREPHEM_PRIVATE_KEY_BYTES PAPABEAREPHEM_KEYGEN_SEED_BYTES
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#define PAPABEAREPHEM_SHARED_SECRET_BYTES 32
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#define PAPABEAREPHEM_ENC_SEED_AND_IV_BYTES 32
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#define PAPABEAREPHEM_PUBLIC_KEY_BYTES 1584
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#define PAPABEAREPHEM_CAPSULE_BYTES 1697
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/**
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* Expand a secret seed to a public/private keypair.
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*
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* @param[out] pk The public key.
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* @param[in] sk The private key, which must be uniformly random.
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*/
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void PQCLEAN_PAPABEAREPHEM_CLEAN_get_pubkey (
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uint8_t pk[PAPABEAREPHEM_PUBLIC_KEY_BYTES],
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const uint8_t sk[PAPABEAREPHEM_PRIVATE_KEY_BYTES]
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);
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/**
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* Create a shared secret using a random seed and another party's public key.
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*
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* Input and output parameters may not alias.
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*
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* @param[out] shared_secret The shared secret key.
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* @param[out] capsule A ciphertext to send to the other party.
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* @param[in] pk The other party's public key.
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* @param[in] seed A random seed.
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*/
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void PQCLEAN_PAPABEAREPHEM_CLEAN_encapsulate (
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uint8_t shared_secret[PAPABEAREPHEM_SHARED_SECRET_BYTES],
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uint8_t capsule[PAPABEAREPHEM_CAPSULE_BYTES],
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const uint8_t pk[PAPABEAREPHEM_PUBLIC_KEY_BYTES],
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const uint8_t seed[PAPABEAREPHEM_ENC_SEED_AND_IV_BYTES]
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);
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/**
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* Extract the shared secret from a capsule using the private key.
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* Has a negligible but nonzero probability of failure.
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*
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* Input and output parameters may not alias.
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*
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* @param[out] shared_secret The shared secret.
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* @param[in] capsule The capsule produced by encapsulate_cca2.
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* @param[in] sk The private key.
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* @return -1 on failure, 0 on success.
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* @warning The value of shared_secret must not be used on failure
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*/
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void PQCLEAN_PAPABEAREPHEM_CLEAN_decapsulate (
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uint8_t shared_secret[PAPABEAREPHEM_SHARED_SECRET_BYTES],
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const uint8_t capsule[PAPABEAREPHEM_CAPSULE_BYTES],
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const uint8_t sk[PAPABEAREPHEM_PRIVATE_KEY_BYTES]
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);
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#endif
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