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Diffstat (limited to 'openssl/doc/crypto/d2i_ECPrivateKey.pod')
-rw-r--r-- | openssl/doc/crypto/d2i_ECPrivateKey.pod | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/openssl/doc/crypto/d2i_ECPrivateKey.pod b/openssl/doc/crypto/d2i_ECPrivateKey.pod new file mode 100644 index 000000000..adeffe643 --- /dev/null +++ b/openssl/doc/crypto/d2i_ECPrivateKey.pod @@ -0,0 +1,67 @@ +=pod + +=head1 NAME + +i2d_ECPrivateKey, d2i_ECPrivate_key - Encode and decode functions for saving and +reading EC_KEY structures + +=head1 SYNOPSIS + + #include <openssl/ec.h> + + EC_KEY *d2i_ECPrivateKey(EC_KEY **key, const unsigned char **in, long len); + int i2d_ECPrivateKey(EC_KEY *key, unsigned char **out); + + unsigned int EC_KEY_get_enc_flags(const EC_KEY *key); + void EC_KEY_set_enc_flags(EC_KEY *eckey, unsigned int flags); + +=head1 DESCRIPTION + +The ECPrivateKey encode and decode routines encode and parse an +B<EC_KEY> structure into a binary format (ASN.1 DER) and back again. + +These functions are similar to the d2i_X509() functions, and you should refer to +that page for a detailed description (see L<d2i_X509(3)|d2i_X509(3)>). + +The format of the external representation of the public key written by +i2d_ECPrivateKey (such as whether it is stored in a compressed form or not) is +described by the point_conversion_form. See L<EC_GROUP_copy(3)|EC_GROUP_copy(3)> +for a description of point_conversion_form. + +When reading a private key encoded without an associated public key (e.g. if +EC_PKEY_NO_PUBKEY has been used - see below), then d2i_ECPrivateKey generates +the missing public key automatically. Private keys encoded without parameters +(e.g. if EC_PKEY_NO_PARAMETERS has been used - see below) cannot be loaded using +d2i_ECPrivateKey. + +The functions EC_KEY_get_enc_flags and EC_KEY_set_enc_flags get and set the +value of the encoding flags for the B<key>. There are two encoding flags +currently defined - EC_PKEY_NO_PARAMETERS and EC_PKEY_NO_PUBKEY. These flags +define the behaviour of how the B<key> is converted into ASN1 in a call to +i2d_ECPrivateKey. If EC_PKEY_NO_PARAMETERS is set then the public parameters for +the curve are not encoded along with the private key. If EC_PKEY_NO_PUBKEY is +set then the public key is not encoded along with the private key. + +=head1 RETURN VALUES + +d2i_ECPrivateKey() returns a valid B<EC_KEY> structure or B<NULL> if an error +occurs. The error code that can be obtained by +L<ERR_get_error(3)|ERR_get_error(3)>. + +i2d_ECPrivateKey() returns the number of bytes successfully encoded or a +negative value if an error occurs. The error code can be obtained by +L<ERR_get_error(3)|ERR_get_error(3)>. + +EC_KEY_get_enc_flags returns the value of the current encoding flags for the +EC_KEY. + +=head1 SEE ALSO + +L<crypto(3)|crypto(3)>, L<ec(3)|ec(3)>, L<EC_GROUP_new(3)|EC_GROUP_new(3)>, +L<EC_GROUP_copy(3)|EC_GROUP_copy(3)>, L<EC_POINT_new(3)|EC_POINT_new(3)>, +L<EC_POINT_add(3)|EC_POINT_add(3)>, +L<EC_GFp_simple_method(3)|EC_GFp_simple_method(3)>, +L<d2i_ECPKParameters(3)|d2i_ECPKParameters(3)>, +L<d2i_ECPrivateKey(3)|d2i_ECPrivateKey(3)> + +=cut |