X-Git-Url: https://www.bearssl.org/gitweb//home/git/?p=BearSSL;a=blobdiff_plain;f=inc%2Fbearssl_ec.h;h=db22692ee75a2cda4b055fd51f5f6d8e9d98bb66;hp=283be0f39af0aac2e69cc5aaf5547453e62ac0c9;hb=966078b3373a273f8417ede42ecab32a414dc109;hpb=89ea3b1876d6a17a754c1f80c74f5076eccda866 diff --git a/inc/bearssl_ec.h b/inc/bearssl_ec.h index 283be0f..db22692 100644 --- a/inc/bearssl_ec.h +++ b/inc/bearssl_ec.h @@ -28,6 +28,12 @@ #include #include +#include "bearssl_rand.h" + +#ifdef __cplusplus +extern "C" { +#endif + /** \file bearssl_ec.h * * # Elliptic Curves @@ -436,6 +442,15 @@ extern const br_ec_impl br_ec_prime_i15; */ extern const br_ec_impl br_ec_p256_m15; +/** + * \brief EC implementation "m31" for P-256. + * + * This implementation uses specialised code for curve secp256r1 (also + * known as NIST P-256), relying on multiplications of 31-bit values + * (MUL31). + */ +extern const br_ec_impl br_ec_p256_m31; + /** * \brief EC implementation "i15" (generic code) for Curve25519. * @@ -503,6 +518,27 @@ extern const br_ec_impl br_ec_c25519_m31; */ extern const br_ec_impl br_ec_all_m15; +/** + * \brief Aggregate EC implementation "m31". + * + * This implementation is a wrapper for: + * + * - `br_ec_c25519_m31` for Curve25519 + * - `br_ec_p256_m31` for NIST P-256 + * - `br_ec_prime_i31` for other curves (NIST P-384 and NIST-P512) + */ +extern const br_ec_impl br_ec_all_m31; + +/** + * \brief Get the "default" EC implementation for the current system. + * + * This returns a pointer to the preferred implementation on the + * current system. + * + * \return the default EC implementation. + */ +const br_ec_impl *br_ec_get_default(void); + /** * \brief Convert a signature from "raw" to "asn1". * @@ -723,4 +759,125 @@ uint32_t br_ecdsa_i15_vrfy_raw(const br_ec_impl *impl, const void *hash, size_t hash_len, const br_ec_public_key *pk, const void *sig, size_t sig_len); +/** + * \brief Get "default" ECDSA implementation (signer, asn1 format). + * + * This returns the preferred implementation of ECDSA signature generation + * ("asn1" output format) on the current system. + * + * \return the default implementation. + */ +br_ecdsa_sign br_ecdsa_sign_asn1_get_default(void); + +/** + * \brief Get "default" ECDSA implementation (signer, raw format). + * + * This returns the preferred implementation of ECDSA signature generation + * ("raw" output format) on the current system. + * + * \return the default implementation. + */ +br_ecdsa_sign br_ecdsa_sign_raw_get_default(void); + +/** + * \brief Get "default" ECDSA implementation (verifier, asn1 format). + * + * This returns the preferred implementation of ECDSA signature verification + * ("asn1" output format) on the current system. + * + * \return the default implementation. + */ +br_ecdsa_vrfy br_ecdsa_vrfy_asn1_get_default(void); + +/** + * \brief Get "default" ECDSA implementation (verifier, raw format). + * + * This returns the preferred implementation of ECDSA signature verification + * ("raw" output format) on the current system. + * + * \return the default implementation. + */ +br_ecdsa_vrfy br_ecdsa_vrfy_raw_get_default(void); + +/** + * \brief Maximum size for EC private key element buffer. + * + * This is the largest number of bytes that `br_ec_keygen()` may need or + * ever return. + */ +#define BR_EC_KBUF_PRIV_MAX_SIZE 72 + +/** + * \brief Maximum size for EC public key element buffer. + * + * This is the largest number of bytes that `br_ec_compute_public()` may + * need or ever return. + */ +#define BR_EC_KBUF_PUB_MAX_SIZE 145 + +/** + * \brief Generate a new EC private key. + * + * If the specified `curve` is not supported by the elliptic curve + * implementation (`impl`), then this function returns zero. + * + * The `sk` structure fields are set to the new private key data. In + * particular, `sk.x` is made to point to the provided key buffer (`kbuf`), + * in which the actual private key data is written. That buffer is assumed + * to be large enough. The `BR_EC_KBUF_PRIV_MAX_SIZE` defines the maximum + * size for all supported curves. + * + * The number of bytes used in `kbuf` is returned. If `kbuf` is `NULL`, then + * the private key is not actually generated, and `sk` may also be `NULL`; + * the minimum length for `kbuf` is still computed and returned. + * + * If `sk` is `NULL` but `kbuf` is not `NULL`, then the private key is + * still generated and stored in `kbuf`. + * + * \param rng_ctx source PRNG context (already initialized). + * \param impl the elliptic curve implementation. + * \param sk the private key structure to fill, or `NULL`. + * \param kbuf the key element buffer, or `NULL`. + * \param curve the curve identifier. + * \return the key data length (in bytes), or zero. + */ +size_t br_ec_keygen(const br_prng_class **rng_ctx, + const br_ec_impl *impl, br_ec_private_key *sk, + void *kbuf, int curve); + +/** + * \brief Compute EC public key from EC private key. + * + * This function uses the provided elliptic curve implementation (`impl`) + * to compute the public key corresponding to the private key held in `sk`. + * The public key point is written into `kbuf`, which is then linked from + * the `*pk` structure. The size of the public key point, i.e. the number + * of bytes used in `kbuf`, is returned. + * + * If `kbuf` is `NULL`, then the public key point is NOT computed, and + * the public key structure `*pk` is unmodified (`pk` may be `NULL` in + * that case). The size of the public key point is still returned. + * + * If `pk` is `NULL` but `kbuf` is not `NULL`, then the public key + * point is computed and stored in `kbuf`, and its size is returned. + * + * If the curve used by the private key is not supported by the curve + * implementation, then this function returns zero. + * + * The private key MUST be valid. An off-range private key value is not + * necessarily detected, and leads to unpredictable results. + * + * \param impl the elliptic curve implementation. + * \param pk the public key structure to fill (or `NULL`). + * \param kbuf the public key point buffer (or `NULL`). + * \param sk the source private key. + * \return the public key point length (in bytes), or zero. + */ +size_t br_ec_compute_pub(const br_ec_impl *impl, br_ec_public_key *pk, + void *kbuf, const br_ec_private_key *sk); + +#ifdef __cplusplus +} +#endif + #endif