=pod =head1 NAME d2i_ECPKParameters, i2d_ECPKParameters, d2i_ECPKParameters_bio, i2d_ECPKParameters_bio, d2i_ECPKParameters_fp, i2d_ECPKParameters_fp(fp,x), ECPKParameters_print, ECPKParameters_print_fp - Functions for decoding and encoding ASN1 representations of elliptic curve entities =head1 SYNOPSIS #include 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); =head1 DESCRIPTION The ECPKParameters encode and decode routines encode and parse the public parameters for an B structure, which represents a curve. d2i_ECPKParameters() attempts to decode B bytes at B<*in>. If successful a pointer to the B structure is returned. If an error occurred then B is returned. If B is not B then the returned structure is written to B<*px>. If B<*px> is not B then it is assumed that B<*px> contains a valid B structure and an attempt is made to reuse it. If the call is successful B<*in> is incremented to the byte following the parsed data. i2d_ECPKParameters() encodes the structure pointed to by B into DER format. If B is not B is writes the DER encoded data to the buffer at B<*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 B<*out> is B memory will be allocated for a buffer and the encoded data written to it. In this case B<*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 B. d2i_ECPKParameters_fp() is similar to d2i_ECPKParameters() except it attempts to parse data from FILE pointer B. i2d_ECPKParameters_bio() is similar to i2d_ECPKParameters() except it writes the encoding of the structure B to BIO B 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 B to BIO B and it returns 1 for success and 0 for failure. These functions are very similar to the X509 functions described in L, 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 B or B. The output lines are indented by B spaces. =head1 RETURN VALUES d2i_ECPKParameters(), d2i_ECPKParameters_bio() and d2i_ECPKParameters_fp() return a valid B structure or B 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. =head1 SEE ALSO L, L, L, L, L, L, L, L, L =cut