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Title "d2i_ECPKParameters 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
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 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 Header "DESCRIPTION" The ECPKParameters encode and decode routines encode and parse the public parameters for an \fB\s-1EC_GROUP\s0 structure, which represents a curve.

\fId2i_ECPKParameters() attempts to decode len bytes at *in. If successful a pointer to the \s-1EC_GROUP\s0 structure is returned. If an error occurred then \s-1NULL\s0 is returned. If px is not \s-1NULL\s0 then the returned structure is written to *px. If *px is not \s-1NULL\s0 then it is assumed that *px contains a valid \s-1EC_GROUP\s0 structure and an attempt is made to reuse it. If the call is successful *in is incremented to the byte following the parsed data.

\fIi2d_ECPKParameters() encodes the structure pointed to by x into \s-1DER\s0 format. If out is not \s-1NULL\s0 is writes the \s-1DER\s0 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 \s-1NULL\s0 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.

\fId2i_ECPKParameters_bio() is similar to d2i_ECPKParameters() except it attempts to parse data from \s-1BIO \s0bp.

\fId2i_ECPKParameters_fp() is similar to d2i_ECPKParameters() except it attempts to parse data from \s-1FILE\s0 pointer fp.

\fIi2d_ECPKParameters_bio() is similar to i2d_ECPKParameters() except it writes the encoding of the structure x to \s-1BIO \s0bp and it returns 1 for success and 0 for failure.

\fIi2d_ECPKParameters_fp() is similar to i2d_ECPKParameters() except it writes the encoding of the structure x to \s-1BIO \s0bp 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 \s-1EC_GROUP\s0 to bp or fp. The output lines are indented by off spaces.

Header "RETURN VALUES" \fId2i_ECPKParameters(), d2i_ECPKParameters_bio() and d2i_ECPKParameters_fp() return a valid \s-1EC_GROUP\s0 structure or \s-1NULL\s0 if an error occurs.

\fIi2d_ECPKParameters() returns the number of bytes successfully encoded or a negative value if an error occurs.

\fIi2d_ECPKParameters_bio(), i2d_ECPKParameters_fp(), ECPKParameters_print and ECPKParameters_print_fp return 1 for success and 0 if an error occurs.

Header "SEE ALSO" \fIcrypto\|(3), ec\|(3), EC_GROUP_new\|(3), EC_GROUP_copy\|(3), \fIEC_POINT_new\|(3), EC_POINT_add\|(3), EC_KEY_new\|(3), \fIEC_GFp_simple_method\|(3), d2i_X509\|(3)