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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.
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)
1.0.2k 2017-01-26 d2i_ECPKParameters(3)
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On Apache
Under GNU General Public License
2024-04-26 23:38 @3.134.118.95 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)