3aef36ffef
Add CRYPTO_EX_DATA add EndC_KEY_[gs]et_method, From Roumen Petrov. Had to add various exdata calls to init/copy/free the exdata. Had to remove const from some EC functions because exdata isn't const-correct. :( Also remove EC_EXTRA_DATA and use a union to hold the possible pre-computed values and an enum to tell which value is in the union. (Rich Salz) Reviewed-by: Dr. Stephen Henson <steve@openssl.org>
104 lines
5.9 KiB
Text
104 lines
5.9 KiB
Text
=pod
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=head1 NAME
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EC_KEY_new, EC_KEY_get_flags, EC_KEY_set_flags, EC_KEY_clear_flags, EC_KEY_new_by_curve_name, EC_KEY_free, EC_KEY_copy, EC_KEY_dup, EC_KEY_up_ref, EC_KEY_get0_group, EC_KEY_set_group, EC_KEY_get0_private_key, EC_KEY_set_private_key, EC_KEY_get0_public_key, EC_KEY_set_public_key, EC_KEY_get_enc_flags, EC_KEY_set_enc_flags, EC_KEY_get_conv_form, EC_KEY_set_conv_form, EC_KEY_set_asn1_flag, EC_KEY_precompute_mult, EC_KEY_generate_key, EC_KEY_check_key, EC_KEY_set_public_key_affine_coordinates - Functions for creating, destroying and manipulating B<EC_KEY> objects.
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=head1 SYNOPSIS
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#include <openssl/ec.h>
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#include <openssl/bn.h>
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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(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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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 *prv);
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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_precompute_mult(EC_KEY *key, BN_CTX *ctx);
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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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=head1 DESCRIPTION
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An EC_KEY represents a public key and (optionally) an associated private key. A new EC_KEY (with no associated curve) can be constructed by calling EC_KEY_new().
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The reference count for the newly created EC_KEY is initially set to 1. A curve can be associated with the EC_KEY by calling
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EC_KEY_set_group().
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Alternatively a new EC_KEY can be constructed by calling EC_KEY_new_by_curve_name() and supplying the nid of the associated curve. Refer to L<EC_GROUP_new(3)> for a description of curve names. This function simply wraps calls to EC_KEY_new() and
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EC_GROUP_new_by_curve_name().
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Calling EC_KEY_free() decrements the reference count for the EC_KEY object, and if it has dropped to zero then frees the memory associated
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with it.
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If B<key> is NULL nothing is done.
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EC_KEY_copy() copies the contents of the EC_KEY in B<src> into B<dest>.
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EC_KEY_dup() creates a new EC_KEY object and copies B<ec_key> into it.
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EC_KEY_up_ref() increments the reference count associated with the EC_KEY object.
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EC_KEY_generate_key() generates a new public and private key for the supplied B<eckey> object. B<eckey> must have an EC_GROUP object
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associated with it before calling this function. The private key is a random integer (0 < priv_key < order, where order is the order
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of the EC_GROUP object). The public key is an EC_POINT on the curve calculated by multiplying the generator for the curve by the
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private key.
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EC_KEY_check_key() performs various sanity checks on the EC_KEY object to confirm that it is valid.
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EC_KEY_set_public_key_affine_coordinates() sets the public key for B<key> based on its affine co-ordinates, i.e. it constructs an EC_POINT
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object based on the supplied B<x> and B<y> values and sets the public key to be this EC_POINT. It will also performs certain sanity checks
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on the key to confirm that it is valid.
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The functions EC_KEY_get0_group(), EC_KEY_set_group(), EC_KEY_get0_private_key(), EC_KEY_set_private_key(), EC_KEY_get0_public_key(), and EC_KEY_set_public_key() get and set the EC_GROUP object, the private key and the EC_POINT public key for the B<key> respectively.
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The functions EC_KEY_get_conv_form() and EC_KEY_set_conv_form() get and set the point_conversion_form for the B<key>. For a description
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of point_conversion_forms please refer to L<EC_POINT_new(3)>.
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EC_KEY_set_flags() sets the flags in the B<flags> parameter on the EC_KEY object. Any flags that are already set are left set. The currently defined standard flags are EC_FLAG_NON_FIPS_ALLOW and EC_FLAG_FIPS_CHECKED. In addition there is the flag EC_FLAG_COFACTOR_ECDH which is specific to ECDH and is defined in ecdh.h. EC_KEY_get_flags returns the current flags that are set for this EC_KEY. EC_KEY_clear_flags clears the flags indicated by the B<flags> parameter. All 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 (if set). Refer to L<EC_GROUP_copy(3)> for further information on the asn1_flag.
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EC_KEY_precompute_mult() stores multiples of the underlying EC_GROUP generator for faster point multiplication. See also L<EC_POINT_add(3)>.
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=head1 RETURN VALUES
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EC_KEY_new(), EC_KEY_new_by_curve_name() and EC_KEY_dup() return a pointer to the newly 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 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_up_ref(), EC_KEY_set_group(), EC_KEY_set_private_key(), EC_KEY_set_public_key(), EC_KEY_precompute_mult(), EC_KEY_generate_key(), EC_KEY_check_key() and EC_KEY_set_public_key_affine_coordinates() return 1 on success or 0 on 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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=head1 SEE ALSO
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L<crypto(3)>, L<ec(3)>, 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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=cut
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