100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
/*
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Crypto using elliptic curves defined over the finite binary field GF(2^m) where m is prime.
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The curves used are the anomalous binary curves (ABC-curves) or also called Koblitz curves.
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This class of curves was chosen because it yields efficient implementation of operations.
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Curves available - their different NIST/SECG names and eqivalent symmetric security level:
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NIST SEC Group strength
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------------------------------------
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K-163 sect163k1 80 bit
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B-163 sect163r2 80 bit
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K-233 sect233k1 112 bit
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B-233 sect233r1 112 bit
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K-283 sect283k1 128 bit
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B-283 sect283r1 128 bit
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K-409 sect409k1 192 bit
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B-409 sect409r1 192 bit
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K-571 sect571k1 256 bit
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B-571 sect571r1 256 bit
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Curve parameters from:
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http://www.secg.org/sec2-v2.pdf
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http://csrc.nist.gov/publications/fips/fips186-3/fips_186-3.pdf
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Reference:
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https://www.ietf.org/rfc/rfc4492.txt
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*/
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#ifndef _ECDH_H__
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#define _ECDH_H__
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/* for size-annotated integer types: uint8_t, uint32_t etc. */
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#include <stdint.h>
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#define NIST_B163 1
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#define NIST_K163 2
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#define NIST_B233 3
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#define NIST_K233 4
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#define NIST_B283 5
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#define NIST_K283 6
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#define NIST_B409 7
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#define NIST_K409 8
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#define NIST_B571 9
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#define NIST_K571 10
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/* What is the default curve to use? */
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#ifndef ECC_CURVE
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#define ECC_CURVE NIST_B163
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#endif
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#if defined(ECC_CURVE) && (ECC_CURVE != 0)
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#if (ECC_CURVE == NIST_K163) || (ECC_CURVE == NIST_B163)
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#define CURVE_DEGREE 163
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#define ECC_PRV_KEY_SIZE 21
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#elif (ECC_CURVE == NIST_K233) || (ECC_CURVE == NIST_B233)
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#define CURVE_DEGREE 233
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#define ECC_PRV_KEY_SIZE 30
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#elif (ECC_CURVE == NIST_K283) || (ECC_CURVE == NIST_B283)
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#define CURVE_DEGREE 283
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#define ECC_PRV_KEY_SIZE 36
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#elif (ECC_CURVE == NIST_K409) || (ECC_CURVE == NIST_B409)
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#define CURVE_DEGREE 409
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#define ECC_PRV_KEY_SIZE 52
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#elif (ECC_CURVE == NIST_K571) || (ECC_CURVE == NIST_B571)
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#define CURVE_DEGREE 571
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#define ECC_PRV_KEY_SIZE 72
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#endif
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#else
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#error Must define a curve to use
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#endif
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#define ECC_PUB_KEY_SIZE (2 * ECC_PRV_KEY_SIZE)
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/******************************************************************************/
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int ecdh_generate_keys(uint8_t* public, uint8_t* private);
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int ecdh_shared_secret(const uint8_t* private, const uint8_t* other_pub, uint8_t* output);
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/******************************************************************************/
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#endif /* #ifndef _ECDH_H__ */
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