65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
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/********************************************************************************************
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* SIDH: an efficient supersingular isogeny cryptography library
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*
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* Abstract: API header file for SIKE
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*********************************************************************************************/
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#ifndef SIKE_H_
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#define SIKE_H_
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#include <stdint.h>
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#include <openssl/base.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* SIKEp503
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*
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* SIKE is a isogeny based post-quantum key encapsulation mechanism. Description of the
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* algorithm is provided in [SIKE]. This implementation uses 503-bit field size. The code
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* is based on "Additional_Implementations" from PQC NIST submission package which can
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* be found here:
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* https://csrc.nist.gov/CSRC/media/Projects/Post-Quantum-Cryptography/documents/round-1/submissions/SIKE.zip
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*
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* [SIKE] https://sike.org/files/SIDH-spec.pdf
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*/
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// SIKEp503_PUB_BYTESZ is the number of bytes in a public key.
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#define SIKEp503_PUB_BYTESZ 378
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// SIKEp503_PRV_BYTESZ is the number of bytes in a private key.
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#define SIKEp503_PRV_BYTESZ 32
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// SIKEp503_SS_BYTESZ is the number of bytes in a shared key.
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#define SIKEp503_SS_BYTESZ 16
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// SIKEp503_MSG_BYTESZ is the number of bytes in a random bit string concatenated
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// with the public key (see 1.4 of SIKE).
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#define SIKEp503_MSG_BYTESZ 24
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// SIKEp503_SS_BYTESZ is the number of bytes in a ciphertext.
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#define SIKEp503_CT_BYTESZ (SIKEp503_PUB_BYTESZ + SIKEp503_MSG_BYTESZ)
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// SIKE_keypair outputs a public and secret key. Internally it uses BN_rand() as
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// an entropy source. In case of success function returns 1, otherwise 0.
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OPENSSL_EXPORT int SIKE_keypair(
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uint8_t out_priv[SIKEp503_PRV_BYTESZ],
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uint8_t out_pub[SIKEp503_PUB_BYTESZ]);
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// SIKE_encaps generates and encrypts a random session key, writing those values to
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// |out_shared_key| and |out_ciphertext|, respectively.
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OPENSSL_EXPORT void SIKE_encaps(
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uint8_t out_shared_key[SIKEp503_SS_BYTESZ],
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uint8_t out_ciphertext[SIKEp503_CT_BYTESZ],
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const uint8_t pub_key[SIKEp503_PUB_BYTESZ]);
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// SIKE_decaps outputs a random session key, writing it to |out_shared_key|.
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OPENSSL_EXPORT void SIKE_decaps(
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uint8_t out_shared_key[SIKEp503_SS_BYTESZ],
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const uint8_t ciphertext[SIKEp503_CT_BYTESZ],
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const uint8_t pub_key[SIKEp503_PUB_BYTESZ],
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const uint8_t priv_key[SIKEp503_PRV_BYTESZ]);
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#ifdef __cplusplus
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}
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#endif
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#endif
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