d2i_ECPKParameters_fp(3)

d2i_ECPKParameters(3)        OpenSSL        d2i_ECPKParameters(3)

NAME

     d2i_ECPKParameters, i2d_ECPKParameters,
     d2i_ECPKParameters_bio, i2d_ECPKParameters_bio,
     d2i_ECPKParameters_fp, i2d_ECPKParameters_fp,
     ECPKParameters_print, ECPKParameters_print_fp - Functions
     for decoding and encoding ASN1 representations of elliptic
     curve entities

SYNOPSIS

      #include <openssl/ec.h>

      EC_GROUP *d2i_ECPKParameters(EC_GROUP **px, const unsigned char **in, long len);
      int i2d_ECPKParameters(const EC_GROUP *x, unsigned char **out);
      #define d2i_ECPKParameters_bio(bp,x) ASN1_d2i_bio_of(EC_GROUP,NULL,d2i_ECPKParameters,bp,x)
      #define i2d_ECPKParameters_bio(bp,x) ASN1_i2d_bio_of_const(EC_GROUP,i2d_ECPKParameters,bp,x)
      #define d2i_ECPKParameters_fp(fp,x) (EC_GROUP *)ASN1_d2i_fp(NULL, \
                     (char *(*)())d2i_ECPKParameters,(fp),(unsigned char **)(x))
      #define i2d_ECPKParameters_fp(fp,x) ASN1_i2d_fp(i2d_ECPKParameters,(fp), \
                     (unsigned char *)(x))
      int     ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off);
      int     ECPKParameters_print_fp(FILE *fp, const EC_GROUP *x, int off);

DESCRIPTION

     The ECPKParameters encode and decode routines encode and
     parse the public parameters for an EC_GROUP structure, which
     represents a curve.

     d2i_ECPKParameters() attempts to decode len bytes at *in. If
     successful a pointer to the EC_GROUP structure is returned.
     If an error occurred then NULL is returned. If px is not
     NULL then the returned structure is written to *px. If *px
     is not NULL then it is assumed that *px contains a valid
     EC_GROUP structure and an attempt is made to reuse it. If
     the call is successful *in is incremented to the byte
     following the parsed data.

     i2d_ECPKParameters() encodes the structure pointed to by x
     into DER format.  If out is not NULL is writes the DER
     encoded data to the buffer at *out, and increments it to
     point after the data just written.  If the return value is
     negative an error occurred, otherwise it returns the length
     of the encoded data.

     If *out is NULL memory will be allocated for a buffer and
     the encoded data written to it. In this case *out is not
     incremented and it points to the start of the data just
     written.

     d2i_ECPKParameters_bio() is similar to d2i_ECPKParameters()
     except it attempts to parse data from BIO bp.

1.0.2t               Last change: 2019-09-10                    1

d2i_ECPKParameters(3)        OpenSSL        d2i_ECPKParameters(3)

     d2i_ECPKParameters_fp() is similar to d2i_ECPKParameters()
     except it attempts to parse data from FILE pointer fp.

     i2d_ECPKParameters_bio() is similar to i2d_ECPKParameters()
     except it writes the encoding of the structure x to BIO bp
     and it returns 1 for success and 0 for failure.

     i2d_ECPKParameters_fp() is similar to i2d_ECPKParameters()
     except it writes the encoding of the structure x to BIO bp
     and it returns 1 for success and 0 for failure.

     These functions are very similar to the X509 functions
     described in d2i_X509(3), where further notes and examples
     are available.

     The ECPKParameters_print and ECPKParameters_print_fp
     functions print a human-readable output of the public
     parameters of the EC_GROUP to bp or fp. The output lines are
     indented by off spaces.

RETURN VALUES

     d2i_ECPKParameters(), d2i_ECPKParameters_bio() and
     d2i_ECPKParameters_fp() return a valid EC_GROUP structure or
     NULL if an error occurs.

     i2d_ECPKParameters() returns the number of bytes
     successfully encoded or a negative value if an error occurs.

     i2d_ECPKParameters_bio(), i2d_ECPKParameters_fp(),
     ECPKParameters_print and ECPKParameters_print_fp return 1
     for success and 0 if an error occurs.

SEE ALSO

     crypto(3), ec(3), EC_GROUP_new(3), EC_GROUP_copy(3),
     EC_POINT_new(3), EC_POINT_add(3), EC_KEY_new(3),
     EC_GFp_simple_method(3), d2i_X509(3)

1.0.2t               Last change: 2019-09-10                    2