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d2i_ECPKParameters_fp.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "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 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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, \e \& (char *(*)())d2i_ECPKParameters,(fp),(unsigned char **)(x)) \& #define i2d_ECPKParameters_fp(fp,x) ASN1_i2d_fp(i2d_ECPKParameters,(fp), \e \& (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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The ECPKParameters encode and decode routines encode and parse the public parameters for an \&\fB\s-1EC_GROUP\s0\fR structure, which represents a curve. .PP \&\fBd2i_ECPKParameters()\fR attempts to decode \fBlen\fR bytes at \fB*in\fR. If successful a pointer to the \fB\s-1EC_GROUP\s0\fR structure is returned. If an error occurred then \fB\s-1NULL\s0\fR is returned. If \fBpx\fR is not \fB\s-1NULL\s0\fR then the returned structure is written to \fB*px\fR. If \fB*px\fR is not \fB\s-1NULL\s0\fR then it is assumed that \fB*px\fR contains a valid \fB\s-1EC_GROUP\s0\fR structure and an attempt is made to reuse it. If the call is successful \fB*in\fR is incremented to the byte following the parsed data. .PP \&\fBi2d_ECPKParameters()\fR encodes the structure pointed to by \fBx\fR into \s-1DER\s0 format. If \fBout\fR is not \fB\s-1NULL\s0\fR is writes the \s-1DER\s0 encoded data to the buffer at \fB*out\fR, 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. .PP If \fB*out\fR is \fB\s-1NULL\s0\fR memory will be allocated for a buffer and the encoded data written to it. In this case \fB*out\fR is not incremented and it points to the start of the data just written. .PP \&\fBd2i_ECPKParameters_bio()\fR is similar to \fBd2i_ECPKParameters()\fR except it attempts to parse data from \s-1BIO\s0 \fBbp\fR. .PP \&\fBd2i_ECPKParameters_fp()\fR is similar to \fBd2i_ECPKParameters()\fR except it attempts to parse data from \s-1FILE\s0 pointer \fBfp\fR. .PP \&\fBi2d_ECPKParameters_bio()\fR is similar to \fBi2d_ECPKParameters()\fR except it writes the encoding of the structure \fBx\fR to \s-1BIO\s0 \fBbp\fR and it returns 1 for success and 0 for failure. .PP \&\fBi2d_ECPKParameters_fp()\fR is similar to \fBi2d_ECPKParameters()\fR except it writes the encoding of the structure \fBx\fR to \s-1BIO\s0 \fBbp\fR and it returns 1 for success and 0 for failure. .PP These functions are very similar to the X509 functions described in \fBd2i_X509\fR\|(3), where further notes and examples are available. .PP The ECPKParameters_print and ECPKParameters_print_fp functions print a human-readable output of the public parameters of the \s-1EC_GROUP\s0 to \fBbp\fR or \fBfp\fR. The output lines are indented by \fBoff\fR spaces. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBd2i_ECPKParameters()\fR, \fBd2i_ECPKParameters_bio()\fR and \fBd2i_ECPKParameters_fp()\fR return a valid \fB\s-1EC_GROUP\s0\fR structure or \fB\s-1NULL\s0\fR if an error occurs. .PP \&\fBi2d_ECPKParameters()\fR returns the number of bytes successfully encoded or a negative value if an error occurs. .PP \&\fBi2d_ECPKParameters_bio()\fR, \fBi2d_ECPKParameters_fp()\fR, ECPKParameters_print and ECPKParameters_print_fp return 1 for success and 0 if an error occurs. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBcrypto\fR\|(3), \fBec\fR\|(3), \fBEC_GROUP_new\fR\|(3), \fBEC_GROUP_copy\fR\|(3), \&\fBEC_POINT_new\fR\|(3), \fBEC_POINT_add\fR\|(3), \fBEC_KEY_new\fR\|(3), \&\fBEC_GFp_simple_method\fR\|(3), \fBd2i_X509\fR\|(3)
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