1d2i_ECPKParameters(3)               OpenSSL              d2i_ECPKParameters(3)
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NAME

6       d2i_ECPKParameters, i2d_ECPKParameters, d2i_ECPKParameters_bio,
7       i2d_ECPKParameters_bio, d2i_ECPKParameters_fp, i2d_ECPKParameters_fp,
8       ECPKParameters_print, ECPKParameters_print_fp - Functions for decoding
9       and encoding ASN1 representations of elliptic curve entities
10

SYNOPSIS

12        #include <openssl/ec.h>
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14        EC_GROUP *d2i_ECPKParameters(EC_GROUP **px, const unsigned char **in, long len);
15        int i2d_ECPKParameters(const EC_GROUP *x, unsigned char **out);
16        #define d2i_ECPKParameters_bio(bp,x) ASN1_d2i_bio_of(EC_GROUP,NULL,d2i_ECPKParameters,bp,x)
17        #define i2d_ECPKParameters_bio(bp,x) ASN1_i2d_bio_of_const(EC_GROUP,i2d_ECPKParameters,bp,x)
18        #define d2i_ECPKParameters_fp(fp,x) (EC_GROUP *)ASN1_d2i_fp(NULL, \
19                       (char *(*)())d2i_ECPKParameters,(fp),(unsigned char **)(x))
20        #define i2d_ECPKParameters_fp(fp,x) ASN1_i2d_fp(i2d_ECPKParameters,(fp), \
21                       (unsigned char *)(x))
22        int     ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off);
23        int     ECPKParameters_print_fp(FILE *fp, const EC_GROUP *x, int off);
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DESCRIPTION

26       The ECPKParameters encode and decode routines encode and parse the
27       public parameters for an EC_GROUP structure, which represents a curve.
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29       d2i_ECPKParameters() attempts to decode len bytes at *in. If successful
30       a pointer to the EC_GROUP structure is returned. If an error occurred
31       then NULL is returned. If px is not NULL then the returned structure is
32       written to *px. If *px is not NULL then it is assumed that *px contains
33       a valid EC_GROUP structure and an attempt is made to reuse it. If the
34       call is successful *in is incremented to the byte following the parsed
35       data.
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37       i2d_ECPKParameters() encodes the structure pointed to by x into DER
38       format.  If out is not NULL is writes the DER encoded data to the
39       buffer at *out, and increments it to point after the data just written.
40       If the return value is negative an error occurred, otherwise it returns
41       the length of the encoded data.
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43       If *out is NULL memory will be allocated for a buffer and the encoded
44       data written to it. In this case *out is not incremented and it points
45       to the start of the data just written.
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47       d2i_ECPKParameters_bio() is similar to d2i_ECPKParameters() except it
48       attempts to parse data from BIO bp.
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50       d2i_ECPKParameters_fp() is similar to d2i_ECPKParameters() except it
51       attempts to parse data from FILE pointer fp.
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53       i2d_ECPKParameters_bio() is similar to i2d_ECPKParameters() except it
54       writes the encoding of the structure x to BIO bp and it returns 1 for
55       success and 0 for failure.
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57       i2d_ECPKParameters_fp() is similar to i2d_ECPKParameters() except it
58       writes the encoding of the structure x to BIO bp and it returns 1 for
59       success and 0 for failure.
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61       These functions are very similar to the X509 functions described in
62       d2i_X509(3), where further notes and examples are available.
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64       The ECPKParameters_print and ECPKParameters_print_fp functions print a
65       human-readable output of the public parameters of the EC_GROUP to bp or
66       fp. The output lines are indented by off spaces.
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RETURN VALUES

69       d2i_ECPKParameters(), d2i_ECPKParameters_bio() and
70       d2i_ECPKParameters_fp() return a valid EC_GROUP structure or NULL if an
71       error occurs.
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73       i2d_ECPKParameters() returns the number of bytes successfully encoded
74       or a negative value if an error occurs.
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76       i2d_ECPKParameters_bio(), i2d_ECPKParameters_fp(), ECPKParameters_print
77       and ECPKParameters_print_fp return 1 for success and 0 if an error
78       occurs.
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SEE ALSO

81       crypto(3), ec(3), EC_GROUP_new(3), EC_GROUP_copy(3), EC_POINT_new(3),
82       EC_POINT_add(3), EC_KEY_new(3), EC_GFp_simple_method(3), d2i_X509(3)
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861.0.2k                            2017-01-26             d2i_ECPKParameters(3)
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