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Update ecp.h
Changes based on review comments. 2 comments still open pending decisions
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Rose Zadik
GitHub
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@ -1,11 +1,11 @@
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/**
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* \file ecp.h
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*
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* \brief This file contains ECP definitions and functions.
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* \brief This file provides an API for Elliptic Curves over GF(P) (ECP).
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*
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* The use of Elliptic Curves over GF(P) (ECP) in cryptography and
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* TLS is defined in <em>Standards for Efficient Cryptography Group
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* (SECG): SEC1 Elliptic Curve Cryptography</em> and
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* The use of ECP in cryptography and TLS is defined in
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* <em>Standards for Efficient Cryptography Group (SECG): SEC1
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* Elliptic Curve Cryptography</em> and
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* <em>RFC-4492: Elliptic Curve Cryptography (ECC) Cipher Suites
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* for Transport Layer Security (TLS)</em>.
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*
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@ -43,7 +43,7 @@
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*/
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#define MBEDTLS_ERR_ECP_BAD_INPUT_DATA -0x4F80 /**< Bad input parameters to function. */
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#define MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL -0x4F00 /**< The buffer is too small to write to. */
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#define MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE -0x4E80 /**< The requested curve not available. */
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#define MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE -0x4E80 /**< The requested curve is not available. */
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#define MBEDTLS_ERR_ECP_VERIFY_FAILED -0x4E00 /**< The signature is not valid. */
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#define MBEDTLS_ERR_ECP_ALLOC_FAILED -0x4D80 /**< Memory allocation failed. */
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#define MBEDTLS_ERR_ECP_RANDOM_FAILED -0x4D00 /**< Generation of random value, such as ephemeral key, failed. */
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@ -65,7 +65,7 @@ extern "C" {
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#endif
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/**
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* Definition of domain parameter identifiers: curve, subgroup and generator.
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* Domain parameters: curve, subgroup, and generator.
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*
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* \note Only curves over prime fields are supported.
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*
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@ -76,16 +76,16 @@ extern "C" {
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typedef enum
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{
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MBEDTLS_ECP_DP_NONE = 0, /*!< Curve not defined. */
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MBEDTLS_ECP_DP_SECP192R1, /*!< Domain parameters for 192-bit NIST curve. */
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MBEDTLS_ECP_DP_SECP224R1, /*!< Domain parameters for 224-bit NIST curve. */
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MBEDTLS_ECP_DP_SECP256R1, /*!< Domain parameters for 256-bit NIST curve. */
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MBEDTLS_ECP_DP_SECP384R1, /*!< Domain parameters for 384-bit NIST curve. */
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MBEDTLS_ECP_DP_SECP521R1, /*!< Domain parameters for 521-bit NIST curve. */
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MBEDTLS_ECP_DP_SECP192R1, /*!< Domain parameters for the 192-bit curve defined by FIPS 186-4 and SEC1. */
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MBEDTLS_ECP_DP_SECP224R1, /*!< Domain parameters for the 224-bit curve defined by FIPS 186-4 and SEC1. */
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MBEDTLS_ECP_DP_SECP256R1, /*!< Domain parameters for the 256-bit curve defined by FIPS 186-4 and SEC1. */
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MBEDTLS_ECP_DP_SECP384R1, /*!< Domain parameters for the 384-bit curve defined by FIPS 186-4 and SEC1. */
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MBEDTLS_ECP_DP_SECP521R1, /*!< Domain parameters for the 521-bit curve defined by FIPS 186-4 and SEC1. */
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MBEDTLS_ECP_DP_BP256R1, /*!< Domain parameters for 256-bit Brainpool curve. */
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MBEDTLS_ECP_DP_BP384R1, /*!< Domain parameters for 384-bit Brainpool curve. */
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MBEDTLS_ECP_DP_BP512R1, /*!< Domain parameters for 512-bit Brainpool curve. */
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MBEDTLS_ECP_DP_CURVE25519, /*!< Domain parameters for a Curve25519 curve. */
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MBEDTLS_ECP_DP_CURVE448, /*!< Domain parameters for a Curve448 curve. */
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MBEDTLS_ECP_DP_CURVE25519, /*!< Domain parameters for Curve25519. */
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MBEDTLS_ECP_DP_CURVE448, /*!< Domain parameters for Curve448. */
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MBEDTLS_ECP_DP_SECP192K1, /*!< Domain parameters for 192-bit "Koblitz" curve. */
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MBEDTLS_ECP_DP_SECP224K1, /*!< Domain parameters for 224-bit "Koblitz" curve. */
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MBEDTLS_ECP_DP_SECP256K1, /*!< Domain parameters for 256-bit "Koblitz" curve. */
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@ -105,7 +105,7 @@ typedef struct
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{
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mbedtls_ecp_group_id grp_id; /*!< An internal identifier. */
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uint16_t tls_id; /*!< The TLS NamedCurve identifier. */
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uint16_t bit_size; /*!< The size of the curve in bits. */
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uint16_t bit_size; /*!< The curve size in bits. */
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const char *name; /*!< A human-friendly name. */
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} mbedtls_ecp_curve_info;
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@ -132,15 +132,16 @@ mbedtls_ecp_point;
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* \brief The ECP group structure.
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*
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* We consider two types of curve equations:
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* <ol><li>Short Weierstrass: <code>y^2 = x^3 + A x + B mod P</code>
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* <ul><li>Short Weierstrass: <code>y^2 = x^3 + A x + B mod P</code>
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* (SEC1 + RFC-4492)</li>
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* <li>Montgomery: <code>y^2 = x^3 + A x^2 + x mod P</code> (Curve25519,
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* Curve448)</li></ol>
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* Curve448)</li></ul>
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* In both cases, the generator (\p G) for a prime-order subgroup is fixed.
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*
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* For Short Weierstrass, this subgroup is the whole curve, and its
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* cardinality is denoted by \p N. Our code requires that \p N is an
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* odd prime.
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* odd prime as mbedtls_ecp_mul() requires an odd number, and
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* mbedtls_ecdsa_sign() requires that it is prime for blinding purposes.
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*
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* For Montgomery curves, we do not store \p A, but <code>(A + 2) / 4</code>,
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* which is the quantity used in the formulas. Additionally, \p nbits is
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@ -160,15 +161,15 @@ typedef struct
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{
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mbedtls_ecp_group_id id; /*!< An internal group identifier. */
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mbedtls_mpi P; /*!< The prime modulus of the base field. */
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mbedtls_mpi A; /*!< For (1) \p A in the equation or for
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(2) <code>(A + 2) / 4</code>. */
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mbedtls_mpi B; /*!< For (1) \p B in the equation or
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for (2) Unused. */
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mbedtls_mpi A; /*!< For Short Weierstrass: \p A in the equation. For
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Montgomery curves: <code>(A + 2) / 4</code>. */
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mbedtls_mpi B; /*!< For Short Weierstrass: \p B in the equation.
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For Montgomery curves: unused. */
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mbedtls_ecp_point G; /*!< The generator of the subgroup used. */
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mbedtls_mpi N; /*!< The order of \p G. */
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size_t pbits; /*!< The number of bits in \p P.*/
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size_t nbits; /*!< For (1) The number of bits in \p P, or
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for (2) the private keys. */
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size_t nbits; /*!< For Short Weierstrass: The number of bits in \p P.
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For Montgomery curves: the private keys. */
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unsigned int h; /*!< \internal 1 if the constants are static. */
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int (*modp)(mbedtls_mpi *); /*!< The function for fast pseudo-reduction
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mod \p P (see above).*/
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@ -176,7 +177,7 @@ typedef struct
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int (*t_post)(mbedtls_ecp_point *, void *); /*!< Unused. */
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void *t_data; /*!< Unused. */
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mbedtls_ecp_point *T; /*!< Pre-computed points for ecp_mul_comb(). */
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size_t T_size; /*!< The number for pre-computed points. */
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size_t T_size; /*!< The number of pre-computed points. */
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}
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mbedtls_ecp_group;
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@ -498,7 +499,7 @@ int mbedtls_ecp_tls_read_point( const mbedtls_ecp_group *grp, mbedtls_ecp_point
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* \brief This function exports a point as a TLS ECPoint record.
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*
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* \param grp The ECP group used.
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* \param pt The point to export.
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* \param pt he point format to export to an \c MBEDTLS_ECP_PF_XXX constant.
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* \param format The export format.
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* \param olen The length of the data written.
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* \param buf The buffer to write to.
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@ -631,9 +632,9 @@ int mbedtls_ecp_muladd( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
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* the NIST groups which all have a cofactor of 1.
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*
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* \note This function uses bare components rather than an
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* mbedtls_ecp_keypair() structure, to ease use with other
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* structures. For example, mbedtls_ecdh_context() or
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* mbedtls_ecdsa_context().
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* ::mbedtls_ecp_keypair structure, to ease use with other
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* structures, such as ::mbedtls_ecdh_context or
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* ::mbedtls_ecdsa_context.
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*
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* \param grp The curve the point should lie on.
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* \param pt The point to check.
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@ -648,9 +649,9 @@ int mbedtls_ecp_check_pubkey( const mbedtls_ecp_group *grp, const mbedtls_ecp_po
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* key for this curve.
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*
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* \note This function uses bare components rather than an
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* mbedtls_ecp_keypair() structure to ease use with other
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* structures such as mbedtls_ecdh_context() or
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* mbedtls_ecdsa_context().
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* ::mbedtls_ecp_keypair structure to ease use with other
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* structures, such as ::mbedtls_ecdh_context() or
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* ::mbedtls_ecdsa_context.
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*
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* \param grp The group used.
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* \param d The integer to check.
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@ -665,10 +666,10 @@ int mbedtls_ecp_check_privkey( const mbedtls_ecp_group *grp, const mbedtls_mpi *
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* point.
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*
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* \note This function uses bare components rather than an
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* mbedtls_ecp_keypair() structure to ease use with other
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* structures such as mbedtls_ecdh_context() or
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* mbedtls_ecdsa_context().
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*
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* ::mbedtls_ecp_keypair structure to ease use with other
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* structures, such as ::mbedtls_ecdh_context or
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* ::mbedtls_ecdsa_context.
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*
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* \param grp The ECP group.
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* \param G The chosen base point.
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* \param d The destination MPI (secret part).
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@ -690,9 +691,9 @@ int mbedtls_ecp_gen_keypair_base( mbedtls_ecp_group *grp,
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* \brief This function generates an ECP keypair.
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*
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* \note This function uses bare components rather than an
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* mbedtls_ecp_keypair() structure to ease use with other
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* structures such as mbedtls_ecdh_context() or
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* mbedtls_ecdsa_context().
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* ::mbedtls_ecp_keypair structure to ease use with other
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* structures, such as ::mbedtls_ecdh_context or
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* ::mbedtls_ecdsa_context.
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*
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* \param grp The ECP group.
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* \param d The destination MPI (secret part).
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@ -724,17 +725,19 @@ int mbedtls_ecp_gen_key( mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
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/**
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* \brief This function checks a public-private key pair.
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* \brief This function checks that the keypair objects
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* \p pub and \p prv have the same group and the
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* same public point, and that the private key in
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* \p prv is consistent with the public key.
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*
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* \param pub The keypair structure holding the public key.
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* \param prv The keypair structure holding the private key.
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* If it contains a private key, that part is ignored.
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* \param prv The keypair structure holding the full keypair.
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*
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* \note The both are keypairs, and may optionally hold the corresponding other key, but the public key passed in thee pub is checked against the private key passed in prv.
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*
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* \return \c 0 on success - the keys are valid and match.
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* \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA, or an \c
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* MBEDTLS_ERR_ECP_XXX or an \c MBEDTLS_ERR_MPI_XXX
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* error code on failure.
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* \return \c 0 on success, meaning that the keys are valid and match.
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* \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if the keys are invalid or do not match.
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* \return An \c MBEDTLS_ERR_ECP_XXX or an \c MBEDTLS_ERR_MPI_XXX
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* error code on calculation failure.
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*/
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int mbedtls_ecp_check_pub_priv( const mbedtls_ecp_keypair *pub, const mbedtls_ecp_keypair *prv );
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