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https://github.com/yuzu-emu/mbedtls.git
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Update ecdsa.h
Minor documentation improvements: *Standardized file brief description. *Separated return statements. *Reordered tags within documentation blocks so that params and returns are last in block. *p_rng descriptions changed from "parameter" to "context".
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Rose Zadik
GitHub
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817297fcd7
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@ -1,9 +1,10 @@
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/**
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* \file ecdsa.h
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*
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* \brief The Elliptic Curve Digital Signature Algorithm (ECDSA).
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* \brief This file contains ECDSA definitions and functions.
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*
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* ECDSA is defined in <em>Standards for Efficient Cryptography Group (SECG):
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* The Elliptic Curve Digital Signature Algorithm (ECDSA) is defined in
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* <em>Standards for Efficient Cryptography Group (SECG):
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* SEC1 Elliptic Curve Cryptography</em>.
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* The use of ECDSA for TLS is defined in <em>RFC-4492: Elliptic Curve
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* Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS)</em>.
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@ -69,6 +70,14 @@ extern "C" {
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*
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* \note The deterministic version is usually preferred.
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*
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* \note If the bitlength of the message hash is larger than the
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* bitlength of the group order, then the hash is truncated
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* as defined in <em>Standards for Efficient Cryptography Group
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* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
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* 4.1.3, step 5.
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*
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* \see ecp.h
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*
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* \param grp The ECP group.
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* \param r The first output integer.
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* \param s The second output integer.
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@ -76,18 +85,11 @@ extern "C" {
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* \param buf The message hash.
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* \param blen The length of \p buf.
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* \param f_rng The RNG function.
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* \param p_rng The RNG parameter.
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* \param p_rng The RNG context.
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*
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* \note If the bitlength of the message hash is larger than the
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* bitlength of the group order, then the hash is truncated
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* as defined in <em>Standards for Efficient Cryptography Group
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* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
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* 4.1.3, step 5.
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*
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* \return \c 0 on success, or an \c MBEDTLS_ERR_ECP_XXX
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* \return \c 0 on success.
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* \return An \c MBEDTLS_ERR_ECP_XXX
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* or \c MBEDTLS_MPI_XXX error code on failure.
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*
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* \see ecp.h
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*/
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int mbedtls_ecdsa_sign( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
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const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
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@ -97,10 +99,19 @@ int mbedtls_ecdsa_sign( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
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/**
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* \brief This function computes the ECDSA signature of a
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* previously-hashed message, deterministic version.
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*
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* For more information, see <em>RFC-6979: Deterministic
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* Usage of the Digital Signature Algorithm (DSA) and Elliptic
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* Curve Digital Signature Algorithm (ECDSA)</em>.
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*
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* \note If the bitlength of the message hash is larger than the
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* bitlength of the group order, then the hash is truncated as
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* defined in <em>Standards for Efficient Cryptography Group
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* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
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* 4.1.3, step 5.
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*
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* \see ecp.h
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*
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* \param grp The ECP group.
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* \param r The first output integer.
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* \param s The second output integer.
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@ -109,17 +120,9 @@ int mbedtls_ecdsa_sign( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
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* \param blen The length of \p buf.
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* \param md_alg The MD algorithm used to hash the message.
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*
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* \note If the bitlength of the message hash is larger than the
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* bitlength of the group order, then the hash is truncated as
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* defined in <em>Standards for Efficient Cryptography Group
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* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
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* 4.1.3, step 5.
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*
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* \return \c 0 on success,
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* or an \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX
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* \return \c 0 on success.
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* \return or an \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX
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* error code on failure.
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*
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* \see ecp.h
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*/
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int mbedtls_ecdsa_sign_det( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
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const mbedtls_mpi *d, const unsigned char *buf, size_t blen,
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@ -130,6 +133,14 @@ int mbedtls_ecdsa_sign_det( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi
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* \brief This function verifies the ECDSA signature of a
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* previously-hashed message.
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*
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* \note If the bitlength of the message hash is larger than the
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* bitlength of the group order, then the hash is truncated as
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* defined in <em>Standards for Efficient Cryptography Group
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* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
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* 4.1.4, step 3.
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*
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* \see ecp.h
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*
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* \param grp The ECP group.
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* \param buf The message hash.
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* \param blen The length of \p buf.
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@ -137,18 +148,10 @@ int mbedtls_ecdsa_sign_det( mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi
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* \param r The first integer of the signature.
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* \param s The second integer of the signature.
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*
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* \note If the bitlength of the message hash is larger than the
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* bitlength of the group order, then the hash is truncated as
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* defined in <em>Standards for Efficient Cryptography Group
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* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
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* 4.1.4, step 3.
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*
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* \return \c 0 on success,
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* #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if signature is invalid,
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* or an \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if signature is invalid.
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* \return An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX
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* error code on failure for any other reason.
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*
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* \see ecp.h
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*/
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int mbedtls_ecdsa_verify( mbedtls_ecp_group *grp,
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const unsigned char *buf, size_t blen,
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@ -169,15 +172,6 @@ int mbedtls_ecdsa_verify( mbedtls_ecp_group *grp,
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* of the Digital Signature Algorithm (DSA) and Elliptic
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* Curve Digital Signature Algorithm (ECDSA)</em>.
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*
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* \param ctx The ECDSA context.
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* \param md_alg The message digest that was used to hash the message.
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* \param hash The message hash.
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* \param hlen The length of the hash.
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* \param sig The buffer that holds the signature.
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* \param slen The length of the signature written.
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* \param f_rng The RNG function.
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* \param p_rng The RNG parameter.
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*
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* \note The \p sig buffer must be at least twice as large as the
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* size of the curve used, plus 9. For example, 73 Bytes if
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* a 256-bit curve is used. A buffer length of
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@ -189,11 +183,20 @@ int mbedtls_ecdsa_verify( mbedtls_ecp_group *grp,
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* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
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* 4.1.3, step 5.
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*
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* \return \c 0 on success,
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* or an \c MBEDTLS_ERR_ECP_XXX, \c MBEDTLS_ERR_MPI_XXX or
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* \c MBEDTLS_ERR_ASN1_XXX error code on failure.
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*
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* \see ecp.h
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*
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* \param ctx The ECDSA context.
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* \param md_alg The message digest that was used to hash the message.
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* \param hash The message hash.
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* \param hlen The length of the hash.
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* \param sig The buffer that holds the signature.
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* \param slen The length of the signature written.
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* \param f_rng The RNG function.
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* \param p_rng The RNG context.
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*
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* \return \c 0 on success.
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* \return An \c MBEDTLS_ERR_ECP_XXX, \c MBEDTLS_ERR_MPI_XXX or
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* \c MBEDTLS_ERR_ASN1_XXX error code on failure.
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*/
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int mbedtls_ecdsa_write_signature( mbedtls_ecdsa_context *ctx, mbedtls_md_type_t md_alg,
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const unsigned char *hash, size_t hlen,
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@ -209,26 +212,17 @@ int mbedtls_ecdsa_write_signature( mbedtls_ecdsa_context *ctx, mbedtls_md_type_t
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#define MBEDTLS_DEPRECATED
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#endif
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/**
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* \brief This function computes an ECDSA signature and writes it to a buffer,
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* serialized as defined in <em>RFC-4492: Elliptic Curve Cryptography
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* (ECC) Cipher Suites for Transport Layer Security (TLS)</em>.
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* \brief This function computes an ECDSA signature and writes
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* it to a buffer, serialized as defined in <em>RFC-4492:
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* Elliptic Curve Cryptography (ECC) Cipher Suites for
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* Transport Layer Security (TLS)</em>.
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*
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* The deterministic version is defined in <em>RFC-6979:
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* Deterministic Usage of the Digital Signature Algorithm (DSA) and
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* Elliptic Curve Digital Signature Algorithm (ECDSA)</em>.
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* The deterministic version is defined in <em>RFC-6979:
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* Deterministic Usage of the Digital Signature Algorithm (DSA)
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* and Elliptic Curve Digital Signature Algorithm (ECDSA)</em>.
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*
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* \warning It is not thread-safe to use the same context in
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* multiple threads.
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*
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* \deprecated Superseded by mbedtls_ecdsa_write_signature() in 2.0.0
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*
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* \param ctx The ECDSA context.
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* \param hash The Message hash.
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* \param hlen The length of the hash.
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* \param sig The buffer that holds the signature.
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* \param slen The length of the signature written.
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* \param md_alg The MD algorithm used to hash the message.
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*
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* \note The \p sig buffer must be at least twice as large as the
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* size of the curve used, plus 9. For example, 73 Bytes if a
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@ -241,11 +235,20 @@ int mbedtls_ecdsa_write_signature( mbedtls_ecdsa_context *ctx, mbedtls_md_type_t
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* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
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* 4.1.3, step 5.
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*
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* \return \c 0 on success,
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* or an \c MBEDTLS_ERR_ECP_XXX, \c MBEDTLS_ERR_MPI_XXX or
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* \c MBEDTLS_ERR_ASN1_XXX error code on failure.
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*
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* \see ecp.h
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*
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* \deprecated Superseded by mbedtls_ecdsa_write_signature() in 2.0.0
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*
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* \param ctx The ECDSA context.
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* \param hash The Message hash.
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* \param hlen The length of the hash.
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* \param sig The buffer that holds the signature.
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* \param slen The length of the signature written.
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* \param md_alg The MD algorithm used to hash the message.
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*
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* \return \c 0 on success.
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* \return An \c MBEDTLS_ERR_ECP_XXX, \c MBEDTLS_ERR_MPI_XXX or
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* \c MBEDTLS_ERR_ASN1_XXX error code on failure.
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*/
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int mbedtls_ecdsa_write_signature_det( mbedtls_ecdsa_context *ctx,
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const unsigned char *hash, size_t hlen,
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@ -258,26 +261,26 @@ int mbedtls_ecdsa_write_signature_det( mbedtls_ecdsa_context *ctx,
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/**
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* \brief This function reads and verifies an ECDSA signature.
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*
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* \param ctx The ECDSA context.
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* \param hash The message hash.
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* \param hlen The size of the hash.
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* \param sig The signature to read and verify.
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* \param slen The size of \p sig.
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*
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* \note If the bitlength of the message hash is larger than the
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* bitlength of the group order, then the hash is truncated as
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* defined in <em>Standards for Efficient Cryptography Group
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* (SECG): SEC1 Elliptic Curve Cryptography</em>, section
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* 4.1.4, step 3.
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*
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* \return \c 0 on success,
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* #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if signature is invalid,
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* #MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH if the signature is
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* valid but its actual length is less than \p siglen,
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* or an \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_ERR_MPI_XXX
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* error code on failure for any other reason.
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*
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* \see ecp.h
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*
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* \param ctx The ECDSA context.
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* \param hash The message hash.
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* \param hlen The size of the hash.
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* \param sig The signature to read and verify.
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* \param slen The size of \p sig.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if signature is invalid.
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* \return #MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH if the signature is
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* valid but its actual length is less than \p siglen.
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* \return An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_ERR_MPI_XXX
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* error code on failure for any other reason.
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*/
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int mbedtls_ecdsa_read_signature( mbedtls_ecdsa_context *ctx,
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const unsigned char *hash, size_t hlen,
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@ -286,16 +289,16 @@ int mbedtls_ecdsa_read_signature( mbedtls_ecdsa_context *ctx,
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/**
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* \brief This function generates an ECDSA keypair on the given curve.
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*
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* \see ecp.h
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*
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* \param ctx The ECDSA context to store the keypair in.
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* \param gid The elliptic curve to use. One of the various
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* \c MBEDTLS_ECP_DP_XXX macros depending on configuration.
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* \param f_rng The RNG function.
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* \param p_rng The RNG parameter.
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* \param p_rng The RNG context.
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*
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* \return \c 0 on success, or an \c MBEDTLS_ERR_ECP_XXX code on
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* failure.
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*
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* \see ecp.h
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* \return \c 0 on success.
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* \return An \c MBEDTLS_ERR_ECP_XXX code on failure.
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*/
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int mbedtls_ecdsa_genkey( mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id gid,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
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@ -303,13 +306,13 @@ int mbedtls_ecdsa_genkey( mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id gid,
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/**
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* \brief This function sets an ECDSA context from an EC key pair.
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*
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* \see ecp.h
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*
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* \param ctx The ECDSA context to set.
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* \param key The EC key to use.
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*
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* \return \c 0 on success, or an \c MBEDTLS_ERR_ECP_XXX code on
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* failure.
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*
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* \see ecp.h
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* \return \c 0 on success.
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* \return An \c MBEDTLS_ERR_ECP_XXX code on failure.
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*/
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int mbedtls_ecdsa_from_keypair( mbedtls_ecdsa_context *ctx, const mbedtls_ecp_keypair *key );
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