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Merge remote-tracking branch 'public/pr/1509' into development-proposed

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* public/pr/1509:
  Update ecdh.h
  Update ecdh.h
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Manuel Pégourié-Gonnard 2018-04-18 11:56:49 +02:00
commit b3a8fe7285
1 changed files with 59 additions and 56 deletions
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115
include/mbedtls/ecdh.h
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@ -1,10 +1,11 @@
/** /**
* \file ecdh.h * \file ecdh.h
* *
* \brief The Elliptic Curve Diffie-Hellman (ECDH) protocol APIs. * \brief This file contains ECDH definitions and functions.
* *
* ECDH is an anonymous key agreement protocol allowing two parties to * The Elliptic Curve Diffie-Hellman (ECDH) protocol is an anonymous
* establish a shared secret over an insecure channel. Each party must have an * key agreement protocol allowing two parties to establish a shared
* secret over an insecure channel. Each party must have an
* elliptic-curve public–private key pair. * elliptic-curve public–private key pair.
* *
* For more information, see <em>NIST SP 800-56A Rev. 2: Recommendation for * For more information, see <em>NIST SP 800-56A Rev. 2: Recommendation for
@ -40,14 +41,12 @@ extern "C" {
#endif #endif
/** /**
* Defines the source of the imported EC key: * Defines the source of the imported EC key.
* <ul><li>Our key.</li>
* <li>The key of the peer.</li></ul>
*/ */
typedef enum typedef enum
{ {
MBEDTLS_ECDH_OURS, MBEDTLS_ECDH_OURS, /**< Our key. */
MBEDTLS_ECDH_THEIRS, MBEDTLS_ECDH_THEIRS, /**< The key of the peer. */
} mbedtls_ecdh_side; } mbedtls_ecdh_side;
/** /**
@ -75,16 +74,18 @@ mbedtls_ecdh_context;
* implemented during the ECDH key exchange. The second core * implemented during the ECDH key exchange. The second core
* computation is performed by mbedtls_ecdh_compute_shared(). * computation is performed by mbedtls_ecdh_compute_shared().
* *
* \see ecp.h
*
* \param grp The ECP group. * \param grp The ECP group.
* \param d The destination MPI (private key). * \param d The destination MPI (private key).
* \param Q The destination point (public key). * \param Q The destination point (public key).
* \param f_rng The RNG function. * \param f_rng The RNG function.
* \param p_rng The RNG parameter. * \param p_rng The RNG context.
* *
* \return \c 0 on success, or an \c MBEDTLS_ERR_ECP_XXX or * \return \c 0 on success.
* \return An \c MBEDTLS_ERR_ECP_XXX or
* \c MBEDTLS_MPI_XXX error code on failure. * \c MBEDTLS_MPI_XXX error code on failure.
* *
* \see ecp.h
*/ */
int mbedtls_ecdh_gen_public( mbedtls_ecp_group *grp, mbedtls_mpi *d, mbedtls_ecp_point *Q, int mbedtls_ecdh_gen_public( mbedtls_ecp_group *grp, mbedtls_mpi *d, mbedtls_ecp_point *Q,
int (*f_rng)(void *, unsigned char *, size_t), int (*f_rng)(void *, unsigned char *, size_t),
@ -97,21 +98,22 @@ int mbedtls_ecdh_gen_public( mbedtls_ecp_group *grp, mbedtls_mpi *d, mbedtls_ecp
* implemented during the ECDH key exchange. The first core * implemented during the ECDH key exchange. The first core
* computation is performed by mbedtls_ecdh_gen_public(). * computation is performed by mbedtls_ecdh_gen_public().
* *
* \see ecp.h
*
* \note If \p f_rng is not NULL, it is used to implement
* countermeasures against side-channel attacks.
* For more information, see mbedtls_ecp_mul().
*
* \param grp The ECP group. * \param grp The ECP group.
* \param z The destination MPI (shared secret). * \param z The destination MPI (shared secret).
* \param Q The public key from another party. * \param Q The public key from another party.
* \param d Our secret exponent (private key). * \param d Our secret exponent (private key).
* \param f_rng The RNG function. * \param f_rng The RNG function.
* \param p_rng The RNG parameter. * \param p_rng The RNG context.
* *
* \return \c 0 on success, or an \c MBEDTLS_ERR_ECP_XXX or * \return \c 0 on success.
* \return An \c MBEDTLS_ERR_ECP_XXX or
* \c MBEDTLS_MPI_XXX error code on failure. * \c MBEDTLS_MPI_XXX error code on failure.
*
* \see ecp.h
*
* \note If \p f_rng is not NULL, it is used to implement
* countermeasures against potential elaborate timing
* attacks. For more information, see mbedtls_ecp_mul().
*/ */
int mbedtls_ecdh_compute_shared( mbedtls_ecp_group *grp, mbedtls_mpi *z, int mbedtls_ecdh_compute_shared( mbedtls_ecp_group *grp, mbedtls_mpi *z,
const mbedtls_ecp_point *Q, const mbedtls_mpi *d, const mbedtls_ecp_point *Q, const mbedtls_mpi *d,
@ -139,21 +141,21 @@ void mbedtls_ecdh_free( mbedtls_ecdh_context *ctx );
* This is the first function used by a TLS server for ECDHE * This is the first function used by a TLS server for ECDHE
* ciphersuites. * ciphersuites.
* *
* \note This function assumes that the ECP group (grp) of the
* \p ctx context has already been properly set,
* for example, using mbedtls_ecp_group_load().
*
* \see ecp.h
*
* \param ctx The ECDH context. * \param ctx The ECDH context.
* \param olen The number of characters written. * \param olen The number of characters written.
* \param buf The destination buffer. * \param buf The destination buffer.
* \param blen The length of the destination buffer. * \param blen The length of the destination buffer.
* \param f_rng The RNG function. * \param f_rng The RNG function.
* \param p_rng The RNG parameter. * \param p_rng The RNG context.
* *
* \note This function assumes that the ECP group (grp) of the * \return \c 0 on success.
* \p ctx context has already been properly set, * \return An \c MBEDTLS_ERR_ECP_XXX error code on failure.
* for example, using mbedtls_ecp_group_load().
*
* \return \c 0 on success, or an \c MBEDTLS_ERR_ECP_XXX error code
* on failure.
*
* \see ecp.h
*/ */
int mbedtls_ecdh_make_params( mbedtls_ecdh_context *ctx, size_t *olen, int mbedtls_ecdh_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
unsigned char *buf, size_t blen, unsigned char *buf, size_t blen,
@ -167,14 +169,15 @@ int mbedtls_ecdh_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
* This is the first function used by a TLS client for ECDHE * This is the first function used by a TLS client for ECDHE
* ciphersuites. * ciphersuites.
* *
* \see ecp.h
*
* \param ctx The ECDH context. * \param ctx The ECDH context.
* \param buf The pointer to the start of the input buffer. * \param buf The pointer to the start of the input buffer.
* \param end The address for one Byte past the end of the buffer. * \param end The address for one Byte past the end of the buffer.
* *
* \return \c 0 on success, or an \c MBEDTLS_ERR_ECP_XXX error code * \return \c 0 on success.
* on failure. * \return An \c MBEDTLS_ERR_ECP_XXX error code on failure.
* *
* \see ecp.h
*/ */
int mbedtls_ecdh_read_params( mbedtls_ecdh_context *ctx, int mbedtls_ecdh_read_params( mbedtls_ecdh_context *ctx,
const unsigned char **buf, const unsigned char *end ); const unsigned char **buf, const unsigned char *end );
@ -186,16 +189,16 @@ int mbedtls_ecdh_read_params( mbedtls_ecdh_context *ctx,
* ServerKeyEchange for static ECDH, and imports ECDH * ServerKeyEchange for static ECDH, and imports ECDH
* parameters from the EC key information of a certificate. * parameters from the EC key information of a certificate.
* *
* \see ecp.h
*
* \param ctx The ECDH context to set up. * \param ctx The ECDH context to set up.
* \param key The EC key to use. * \param key The EC key to use.
* \param side Defines the source of the key: * \param side Defines the source of the key: 1: Our key, or
* <ul><li>1: Our key.</li> * 0: The key of the peer.
<li>0: The key of the peer.</li></ul>
* *
* \return \c 0 on success, or an \c MBEDTLS_ERR_ECP_XXX error code * \return \c 0 on success.
* on failure. * \return An \c MBEDTLS_ERR_ECP_XXX error code on failure.
* *
* \see ecp.h
*/ */
int mbedtls_ecdh_get_params( mbedtls_ecdh_context *ctx, const mbedtls_ecp_keypair *key, int mbedtls_ecdh_get_params( mbedtls_ecdh_context *ctx, const mbedtls_ecp_keypair *key,
mbedtls_ecdh_side side ); mbedtls_ecdh_side side );
@ -207,17 +210,17 @@ int mbedtls_ecdh_get_params( mbedtls_ecdh_context *ctx, const mbedtls_ecp_keypai
* This is the second function used by a TLS client for ECDH(E) * This is the second function used by a TLS client for ECDH(E)
* ciphersuites. * ciphersuites.
* *
* \see ecp.h
*
* \param ctx The ECDH context. * \param ctx The ECDH context.
* \param olen The number of Bytes written. * \param olen The number of Bytes written.
* \param buf The destination buffer. * \param buf The destination buffer.
* \param blen The size of the destination buffer. * \param blen The size of the destination buffer.
* \param f_rng The RNG function. * \param f_rng The RNG function.
* \param p_rng The RNG parameter. * \param p_rng The RNG context.
* *
* \return \c 0 on success, or an \c MBEDTLS_ERR_ECP_XXX error code * \return \c 0 on success.
* on failure. * \return An \c MBEDTLS_ERR_ECP_XXX error code on failure.
*
* \see ecp.h
*/ */
int mbedtls_ecdh_make_public( mbedtls_ecdh_context *ctx, size_t *olen, int mbedtls_ecdh_make_public( mbedtls_ecdh_context *ctx, size_t *olen,
unsigned char *buf, size_t blen, unsigned char *buf, size_t blen,
@ -231,14 +234,14 @@ int mbedtls_ecdh_make_public( mbedtls_ecdh_context *ctx, size_t *olen,
* This is the second function used by a TLS server for ECDH(E) * This is the second function used by a TLS server for ECDH(E)
* ciphersuites. * ciphersuites.
* *
* \see ecp.h
*
* \param ctx The ECDH context. * \param ctx The ECDH context.
* \param buf The start of the input buffer. * \param buf The start of the input buffer.
* \param blen The length of the input buffer. * \param blen The length of the input buffer.
* *
* \return \c 0 on success, or an \c MBEDTLS_ERR_ECP_XXX error code * \return \c 0 on success.
* on failure. * \return An \c MBEDTLS_ERR_ECP_XXX error code on failure.
*
* \see ecp.h
*/ */
int mbedtls_ecdh_read_public( mbedtls_ecdh_context *ctx, int mbedtls_ecdh_read_public( mbedtls_ecdh_context *ctx,
const unsigned char *buf, size_t blen ); const unsigned char *buf, size_t blen );
@ -249,21 +252,21 @@ int mbedtls_ecdh_read_public( mbedtls_ecdh_context *ctx,
* This is the last function used by both TLS client * This is the last function used by both TLS client
* and servers. * and servers.
* *
* \note If \p f_rng is not NULL, it is used to implement
* countermeasures against side-channel attacks.
* For more information, see mbedtls_ecp_mul().
*
* \see ecp.h
*
* \param ctx The ECDH context. * \param ctx The ECDH context.
* \param olen The number of Bytes written. * \param olen The number of Bytes written.
* \param buf The destination buffer. * \param buf The destination buffer.
* \param blen The length of the destination buffer. * \param blen The length of the destination buffer.
* \param f_rng The RNG function. * \param f_rng The RNG function.
* \param p_rng The RNG parameter. * \param p_rng The RNG context.
* *
* \return \c 0 on success, or an \c MBEDTLS_ERR_ECP_XXX error code * \return \c 0 on success.
* on failure. * \return An \c MBEDTLS_ERR_ECP_XXX error code on failure.
*
* \see ecp.h
*
* \note If \p f_rng is not NULL, it is used to implement
* countermeasures against potential elaborate timing
* attacks. For more information, see mbedtls_ecp_mul().
*/ */
int mbedtls_ecdh_calc_secret( mbedtls_ecdh_context *ctx, size_t *olen, int mbedtls_ecdh_calc_secret( mbedtls_ecdh_context *ctx, size_t *olen,
unsigned char *buf, size_t blen, unsigned char *buf, size_t blen,