246 lines
10 KiB
Plaintext
246 lines
10 KiB
Plaintext
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=pod
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=head1 NAME
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EVP_EC_gen,
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EC_KEY_get_method, EC_KEY_set_method, EC_KEY_new_ex,
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EC_KEY_new, EC_KEY_get_flags, EC_KEY_set_flags, EC_KEY_clear_flags,
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EC_KEY_new_by_curve_name_ex, EC_KEY_new_by_curve_name, EC_KEY_free,
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EC_KEY_copy, EC_KEY_dup, EC_KEY_up_ref, EC_KEY_get0_engine,
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EC_KEY_get0_group, EC_KEY_set_group, EC_KEY_get0_private_key,
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EC_KEY_set_private_key, EC_KEY_get0_public_key, EC_KEY_set_public_key,
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EC_KEY_get_conv_form,
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EC_KEY_set_conv_form, EC_KEY_set_asn1_flag,
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EC_KEY_decoded_from_explicit_params, EC_KEY_precompute_mult,
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EC_KEY_generate_key, EC_KEY_check_key, EC_KEY_set_public_key_affine_coordinates,
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EC_KEY_oct2key, EC_KEY_key2buf, EC_KEY_oct2priv, EC_KEY_priv2oct,
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EC_KEY_priv2buf - Functions for creating, destroying and manipulating
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EC_KEY objects
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=head1 SYNOPSIS
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#include <openssl/ec.h>
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EVP_PKEY *EVP_EC_gen(const char *curve);
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The following functions have been deprecated since OpenSSL 3.0, and can be
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hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
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see L<openssl_user_macros(7)>:
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EC_KEY *EC_KEY_new_ex(OSSL_LIB_CTX *ctx, const char *propq);
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EC_KEY *EC_KEY_new(void);
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int EC_KEY_get_flags(const EC_KEY *key);
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void EC_KEY_set_flags(EC_KEY *key, int flags);
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void EC_KEY_clear_flags(EC_KEY *key, int flags);
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EC_KEY *EC_KEY_new_by_curve_name_ex(OSSL_LIB_CTX *ctx, const char *propq,
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int nid);
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EC_KEY *EC_KEY_new_by_curve_name(int nid);
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void EC_KEY_free(EC_KEY *key);
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EC_KEY *EC_KEY_copy(EC_KEY *dst, const EC_KEY *src);
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EC_KEY *EC_KEY_dup(const EC_KEY *src);
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int EC_KEY_up_ref(EC_KEY *key);
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ENGINE *EC_KEY_get0_engine(const EC_KEY *eckey);
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const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key);
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int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group);
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const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key);
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int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key);
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const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key);
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int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub);
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point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key);
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void EC_KEY_set_conv_form(EC_KEY *eckey, point_conversion_form_t cform);
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void EC_KEY_set_asn1_flag(EC_KEY *eckey, int asn1_flag);
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int EC_KEY_decoded_from_explicit_params(const EC_KEY *key);
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int EC_KEY_generate_key(EC_KEY *key);
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int EC_KEY_check_key(const EC_KEY *key);
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int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x, BIGNUM *y);
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const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key);
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int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth);
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int EC_KEY_oct2key(EC_KEY *eckey, const unsigned char *buf, size_t len, BN_CTX *ctx);
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size_t EC_KEY_key2buf(const EC_KEY *eckey, point_conversion_form_t form,
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unsigned char **pbuf, BN_CTX *ctx);
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int EC_KEY_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len);
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size_t EC_KEY_priv2oct(const EC_KEY *eckey, unsigned char *buf, size_t len);
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size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf);
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int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx);
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=head1 DESCRIPTION
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EVP_EC_gen() generates a new EC key pair on the given I<curve>.
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All of the functions described below are deprecated.
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Applications should instead use EVP_EC_gen(), L<EVP_PKEY_Q_keygen(3)>, or
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L<EVP_PKEY_keygen_init(3)> and L<EVP_PKEY_keygen(3)>.
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An EC_KEY represents a public key and, optionally, the associated private
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key.
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A new EC_KEY with no associated curve can be constructed by calling
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EC_KEY_new_ex() and specifying the associated library context in I<ctx>
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(see L<OSSL_LIB_CTX(3)>) and property query string I<propq>.
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The I<ctx> parameter may be NULL in which case the default library context is
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used.
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The reference count for the newly created EC_KEY is initially
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set to 1.
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A curve can be associated with the EC_KEY by calling
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EC_KEY_set_group().
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EC_KEY_new() is the same as EC_KEY_new_ex() except that the default library
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context is always used.
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Alternatively a new EC_KEY can be constructed by calling
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EC_KEY_new_by_curve_name_ex() and supplying the nid of the associated
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curve, the library context to be used I<ctx> (see L<OSSL_LIB_CTX(3)>) and any
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property query string I<propq>.
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The I<ctx> parameter may be NULL in which case the default library context is
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used. The I<propq> value may also be NULL.
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See L<EC_GROUP_new(3)> for a description of curve names.
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This function simply wraps calls to EC_KEY_new_ex() and
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EC_GROUP_new_by_curve_name_ex().
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EC_KEY_new_by_curve_name() is the same as EC_KEY_new_by_curve_name_ex()
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except that the default library context is always used and a NULL property query
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string.
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Calling EC_KEY_free() decrements the reference count for the EC_KEY object,
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and if it has dropped to zero then frees the memory associated with it. If
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I<key> is NULL nothing is done.
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EC_KEY_copy() copies the contents of the EC_KEY in I<src> into I<dest>.
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EC_KEY_dup() creates a new EC_KEY object and copies I<ec_key> into it.
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EC_KEY_up_ref() increments the reference count associated with the EC_KEY
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object.
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EC_KEY_get0_engine() returns a handle to the ENGINE that has been set for
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this EC_KEY object.
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EC_KEY_generate_key() generates a new public and private key for the supplied
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I<eckey> object. I<eckey> must have an EC_GROUP object associated with it
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before calling this function. The private key is a random integer (0 < priv_key
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< order, where I<order> is the order of the EC_GROUP object). The public key is
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an EC_POINT on the curve calculated by multiplying the generator for the
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curve by the private key.
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EC_KEY_check_key() performs various sanity checks on the EC_KEY object to
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confirm that it is valid.
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EC_KEY_set_public_key_affine_coordinates() sets the public key for I<key> based
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on its affine coordinates; i.e., it constructs an EC_POINT object based on
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the supplied I<x> and I<y> values and sets the public key to be this
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EC_POINT. It also performs certain sanity checks on the key to confirm
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that it is valid.
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The functions EC_KEY_get0_group(), EC_KEY_set_group(),
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EC_KEY_get0_private_key(), EC_KEY_set_private_key(), EC_KEY_get0_public_key(),
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and EC_KEY_set_public_key() get and set the EC_GROUP object, the private key,
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and the EC_POINT public key for the B<key> respectively. The function
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EC_KEY_set_private_key() accepts NULL as the priv_key argument to securely clear
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the private key component from the EC_KEY.
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The functions EC_KEY_get_conv_form() and EC_KEY_set_conv_form() get and set the
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point_conversion_form for the I<key>. For a description of
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point_conversion_forms please see L<EC_POINT_new(3)>.
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EC_KEY_set_flags() sets the flags in the I<flags> parameter on the EC_KEY
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object. Any flags that are already set are left set. The flags currently
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defined are EC_FLAG_NON_FIPS_ALLOW and EC_FLAG_FIPS_CHECKED. In
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addition there is the flag EC_FLAG_COFACTOR_ECDH which is specific to ECDH.
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EC_KEY_get_flags() returns the current flags that are set for this EC_KEY.
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EC_KEY_clear_flags() clears the flags indicated by the I<flags> parameter; all
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other flags are left in their existing state.
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EC_KEY_set_asn1_flag() sets the asn1_flag on the underlying EC_GROUP object
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(if set). Refer to L<EC_GROUP_copy(3)> for further information on the
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asn1_flag.
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EC_KEY_decoded_from_explicit_params() returns 1 if the group of the I<key> was
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decoded from data with explicitly encoded group parameters, -1 if the I<key>
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is NULL or the group parameters are missing, and 0 otherwise.
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EC_KEY_precompute_mult() stores multiples of the underlying EC_GROUP generator
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for faster point multiplication. See also L<EC_POINT_add(3)>.
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Modern versions should instead switch to named curves which OpenSSL has
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hardcoded lookup tables for.
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EC_KEY_oct2key() and EC_KEY_key2buf() are identical to the functions
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EC_POINT_oct2point() and EC_POINT_point2buf() except they use the public key
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EC_POINT in I<eckey>.
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EC_KEY_oct2priv() and EC_KEY_priv2oct() convert between the private key
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component of I<eckey> and octet form. The octet form consists of the content
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octets of the I<privateKey> OCTET STRING in an I<ECPrivateKey> ASN.1 structure.
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The function EC_KEY_priv2oct() must be supplied with a buffer long enough to
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store the octet form. The return value provides the number of octets stored.
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Calling the function with a NULL buffer will not perform the conversion but
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will just return the required buffer length.
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The function EC_KEY_priv2buf() allocates a buffer of suitable length and writes
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an EC_KEY to it in octet format. The allocated buffer is written to I<*pbuf>
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and its length is returned. The caller must free up the allocated buffer with a
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call to OPENSSL_free(). Since the allocated buffer value is written to I<*pbuf>
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the I<pbuf> parameter B<MUST NOT> be B<NULL>.
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EC_KEY_priv2buf() converts an EC_KEY private key into an allocated buffer.
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=head1 RETURN VALUES
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EC_KEY_new_ex(), EC_KEY_new(), EC_KEY_new_by_curve_name_ex(),
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EC_KEY_new_by_curve_name() and EC_KEY_dup() return a pointer to the newly
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created EC_KEY object, or NULL on error.
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EC_KEY_get_flags() returns the flags associated with the EC_KEY object as an
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integer.
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EC_KEY_copy() returns a pointer to the destination key, or NULL on error.
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EC_KEY_get0_engine() returns a pointer to an ENGINE, or NULL if it wasn't set.
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EC_KEY_up_ref(), EC_KEY_set_group(), EC_KEY_set_public_key(),
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EC_KEY_precompute_mult(), EC_KEY_generate_key(), EC_KEY_check_key(),
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EC_KEY_set_public_key_affine_coordinates(), EC_KEY_oct2key() and
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EC_KEY_oct2priv() return 1 on success or 0 on error.
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EC_KEY_set_private_key() returns 1 on success or 0 on error except when the
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priv_key argument is NULL, in that case it returns 0, for legacy compatibility,
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and should not be treated as an error.
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EC_KEY_get0_group() returns the EC_GROUP associated with the EC_KEY.
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EC_KEY_get0_private_key() returns the private key associated with the EC_KEY.
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EC_KEY_get_conv_form() return the point_conversion_form for the EC_KEY.
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EC_KEY_key2buf(), EC_KEY_priv2oct() and EC_KEY_priv2buf() return the length
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of the buffer or 0 on error.
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=head1 SEE ALSO
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L<EVP_PKEY_Q_keygen(3)>
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L<crypto(7)>, L<EC_GROUP_new(3)>,
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L<EC_GROUP_copy(3)>, L<EC_POINT_new(3)>,
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L<EC_POINT_add(3)>,
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L<EC_GFp_simple_method(3)>,
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L<d2i_ECPKParameters(3)>,
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L<OSSL_LIB_CTX(3)>
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=head1 HISTORY
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EVP_EC_gen() was added in OpenSSL 3.0.
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All other functions described here were deprecated in OpenSSL 3.0.
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For replacement see L<EVP_PKEY-EC(7)>.
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=head1 COPYRIGHT
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Copyright 2013-2023 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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