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1.\" $OpenBSD: d2i_ECPKParameters.3,v 1.13 2024/10/24 21:42:10 tb Exp $
2.\" OpenSSL 05ea606a May 20 20:52:46 2016 -0400
3.\"
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7.\" Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
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21.\" The original file was written by Matt Caswell <matt@openssl.org>.
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68.Dd $Mdocdate: October 24 2024 $
69.Dt D2I_ECPKPARAMETERS 3
70.Os
71.Sh NAME
72.Nm d2i_ECPKParameters ,
73.Nm i2d_ECPKParameters ,
74.Nm d2i_ECPKParameters_bio ,
75.Nm i2d_ECPKParameters_bio ,
76.Nm d2i_ECPKParameters_fp ,
77.Nm i2d_ECPKParameters_fp ,
78.Nm d2i_ECParameters ,
79.Nm i2d_ECParameters ,
80.Nm ECParameters_dup ,
81.Nm d2i_ECPrivateKey ,
82.Nm i2d_ECPrivateKey ,
83.Nm d2i_ECPrivateKey_bio ,
84.Nm i2d_ECPrivateKey_bio ,
85.Nm d2i_ECPrivateKey_fp ,
86.Nm i2d_ECPrivateKey_fp ,
87.Nm o2i_ECPublicKey ,
88.Nm i2o_ECPublicKey ,
89.Nm ECPKParameters_print ,
90.Nm ECPKParameters_print_fp ,
91.Nm ECParameters_print ,
92.Nm ECParameters_print_fp ,
93.Nm d2i_EC_PUBKEY ,
94.Nm i2d_EC_PUBKEY ,
95.Nm d2i_EC_PUBKEY_bio ,
96.Nm i2d_EC_PUBKEY_bio ,
97.Nm d2i_EC_PUBKEY_fp ,
98.Nm i2d_EC_PUBKEY_fp
99.Nd decode and encode ASN.1 representations of elliptic curve entities
100.Sh SYNOPSIS
101.In openssl/ec.h
102.Ft EC_GROUP *
103.Fo d2i_ECPKParameters
104.Fa "EC_GROUP **val_out"
105.Fa "const unsigned char **der_in"
106.Fa "long length"
107.Fc
108.Ft int
109.Fo i2d_ECPKParameters
110.Fa "const EC_GROUP *val_in"
111.Fa "unsigned char **der_out"
112.Fc
113.Ft EC_GROUP *
114.Fo d2i_ECPKParameters_bio
115.Fa "BIO *in_bio"
116.Fa "EC_GROUP **val_out"
117.Fc
118.Ft int
119.Fo i2d_ECPKParameters_bio
120.Fa "BIO *out_bio"
121.Fa "EC_GROUP *val_in"
122.Fc
123.Ft EC_GROUP *
124.Fo d2i_ECPKParameters_fp
125.Fa "FILE *in_fp"
126.Fa "EC_GROUP **val_out"
127.Fc
128.Ft int
129.Fo i2d_ECPKParameters_fp
130.Fa "FILE *out_fp"
131.Fa "EC_GROUP *val_in"
132.Fc
133.Ft EC_KEY *
134.Fo d2i_ECParameters
135.Fa "EC_KEY **val_out"
136.Fa "const unsigned char **der_in"
137.Fa "long length"
138.Fc
139.Ft int
140.Fo i2d_ECParameters
141.Fa "EC_KEY *val_in"
142.Fa "unsigned char **der_out"
143.Fc
144.Ft EC_KEY *
145.Fo ECParameters_dup
146.Fa "EC_KEY *val_in"
147.Fc
148.Ft EC_KEY *
149.Fo d2i_ECPrivateKey
150.Fa "EC_KEY **val_out"
151.Fa "const unsigned char **der_in"
152.Fa "long length"
153.Fc
154.Ft int
155.Fo i2d_ECPrivateKey
156.Fa "EC_KEY *val_in"
157.Fa "unsigned char **der_out"
158.Fc
159.Ft EC_KEY *
160.Fo d2i_ECPrivateKey_bio
161.Fa "BIO *in_bio"
162.Fa "EC_KEY **val_out"
163.Fc
164.Ft int
165.Fo i2d_ECPrivateKey_bio
166.Fa "BIO *out_bio"
167.Fa "EC_KEY *val_in"
168.Fc
169.Ft EC_KEY *
170.Fo d2i_ECPrivateKey_fp
171.Fa "FILE *in_fp"
172.Fa "EC_KEY **val_out"
173.Fc
174.Ft int
175.Fo i2d_ECPrivateKey_fp
176.Fa "FILE *out_fp"
177.Fa "EC_KEY *val_in"
178.Fc
179.Ft EC_KEY *
180.Fo o2i_ECPublicKey
181.Fa "EC_KEY **val_out"
182.Fa "const unsigned char **der_in"
183.Fa "long length"
184.Fc
185.Ft int
186.Fo i2o_ECPublicKey
187.Fa "const EC_KEY *val_in"
188.Fa "unsigned char **der_out"
189.Fc
190.Ft int
191.Fo ECPKParameters_print
192.Fa "BIO *out_bio"
193.Fa "const EC_GROUP *val_in"
194.Fa "int indent"
195.Fc
196.Ft int
197.Fo ECPKParameters_print_fp
198.Fa "FILE *out_fp"
199.Fa "const EC_GROUP *val_in"
200.Fa "int indent"
201.Fc
202.Ft int
203.Fo ECParameters_print
204.Fa "BIO *out_bio"
205.Fa "const EC_KEY *val_in"
206.Fc
207.Ft int
208.Fo ECParameters_print_fp
209.Fa "FILE *out_fp"
210.Fa "const EC_KEY *val_in"
211.Fc
212.In openssl/x509.h
213.Ft EC_KEY *
214.Fo d2i_EC_PUBKEY
215.Fa "EC_KEY **val_out"
216.Fa "const unsigned char **der_in"
217.Fa "long length"
218.Fc
219.Ft int
220.Fo i2d_EC_PUBKEY
221.Fa "EC_KEY *val_in"
222.Fa "unsigned char **der_out"
223.Fc
224.Ft EC_KEY *
225.Fo d2i_EC_PUBKEY_bio
226.Fa "BIO *in_bio"
227.Fa "EC_KEY **val_out"
228.Fc
229.Ft int
230.Fo i2d_EC_PUBKEY_bio
231.Fa "BIO *out_bio"
232.Fa "EC_KEY *val_in"
233.Fc
234.Ft EC_KEY *
235.Fo d2i_EC_PUBKEY_fp
236.Fa "FILE *in_fp"
237.Fa "EC_KEY **val_out"
238.Fc
239.Ft int
240.Fo i2d_EC_PUBKEY_fp
241.Fa "FILE *out_fp"
242.Fa "EC_KEY *val_in"
243.Fc
244.Sh DESCRIPTION
245These functions decode and encode elliptic curve keys and parameters.
246For details about the semantics, examples, caveats, and bugs, see
247.Xr ASN1_item_d2i 3 .
248.Pp
249.Fn d2i_ECPKParameters
250and
251.Fn i2d_ECPKParameters
252decode and encode the parameters of an elliptic curve.
253.Fn d2i_ECPKParameters_bio ,
254.Fn i2d_ECPKParameters_bio ,
255.Fn d2i_ECPKParameters_fp ,
256and
257.Fn i2d_ECPKParameters_fp
258are similar except that they decode or encode using a
259.Vt BIO
260or
261.Vt FILE
262pointer.
263These four functions are currently implemented as macros.
264.Pp
265.Fn d2i_ECParameters
266does the same parsing as
267.Fn d2i_ECPKParameters
268but saves the result in the
269.Fa group
270field of an
271.Vt EC_KEY
272structure.
273.Pp
274.Fn i2d_ECParameters
275produces the same output as
276.Fn i2d_ECPKParameters
277but uses
278.Fa val_in->group
279for input instead of
280.Fa val_in .
281.Pp
282.Fn ECParameters_dup
283allocates and initializes an empty
284.Vt EC_KEY
285object and copies the EC parameters from
286.Fa val_in
287to it by calling
288.Fn i2d_ECParameters
289and
290.Fn d2i_ECParameters .
291If a private or public key or any flags are present in
292.Fa val_in ,
293they are not copied.
294.Pp
295.Fn d2i_ECPrivateKey
296and
297.Fn i2d_ECPrivateKey
298decode and encode an EC private key using an ASN.1
299.Vt ECPrivateKey
300structure defined in RFC 5915 section 3 and used for the privateKey
301field of the ASN.1
302.Vt PrivateKeyInfo
303structure defined in RFC 5208 section 5, see
304.Xr PKCS8_PRIV_KEY_INFO_new 3 .
305.Fn d2i_ECPrivateKey_bio ,
306.Fn i2d_ECPrivateKey_bio ,
307.Fn d2i_ECPrivateKey_fp ,
308and
309.Fn i2d_ECPrivateKey_fp
310are similar except that they decode or encode using a
311.Vt BIO
312or
313.Vt FILE
314pointer.
315.Pp
316.Fn o2i_ECPublicKey
317and
318.Fn i2o_ECPublicKey
319decode and encode an EC public key.
320In contrast to
321.Xr ASN1_item_d2i 3 ,
322.Fn o2i_ECPublicKey
323requires
324.Fa val_out ,
325.Pf * Fa val_out ,
326and
327.Po Pf * Fa val_out Pc Ns -> Ns Fa group
328to be
329.Pf non- Dv NULL .
330.Pp
331.Fn ECPKParameters_print
332and
333.Fn ECPKParameters_print_fp
334print human-readable output of the public parameters of the
335.Vt EC_GROUP
336to
337.Fa out_bio
338or
339.Fa out_fp .
340The output lines are indented by
341.Fa indent
342spaces.
343.Pp
344.Fn ECParameters_print
345and
346.Fn ECParameters_print_fp
347print the parameter components of
348.Fa val_in
349to
350.Fa out_bio
351or
352.Fa out_fp .
353.Pp
354.Fn d2i_EC_PUBKEY
355and
356.Fn i2d_EC_PUBKEY
357decode and encode an EC public key using an ASN.1
358.Vt SubjectPublicKeyInfo
359structure defined in RFC 5280 section 4.1 and documented in
360.Xr X509_PUBKEY_new 3 .
361.Fn d2i_EC_PUBKEY_bio ,
362.Fn i2d_EC_PUBKEY_bio ,
363.Fn d2i_EC_PUBKEY_fp ,
364and
365.Fn i2d_EC_PUBKEY_fp
366are similar except that they decode or encode using a
367.Vt BIO
368or
369.Vt FILE
370pointer.
371.Sh RETURN VALUES
372.Fn d2i_ECPKParameters ,
373.Fn d2i_ECPKParameters_bio ,
374and
375.Fn d2i_ECPKParameters_fp
376return a valid
377.Vt EC_GROUP
378structure or
379.Dv NULL
380if an error occurs.
381.Pp
382.Fn d2i_ECParameters ,
383.Fn ECParameters_dup ,
384.Fn d2i_ECPrivateKey ,
385.Fn d2i_ECPrivateKey_bio ,
386.Fn d2i_ECPrivateKey_fp ,
387.Fn o2i_ECPublicKey ,
388.Fn d2i_EC_PUBKEY ,
389.Fn d2i_EC_PUBKEY_bio ,
390and
391.Fn d2i_EC_PUBKEY_fp
392return a valid
393.Vt EC_KEY
394structure or
395.Dv NULL
396if an error occurs.
397.Pp
398.Fn i2d_ECPKParameters ,
399.Fn i2d_ECParameters ,
400.Fn i2d_ECPrivateKey ,
401.Fn i2o_ECPublicKey ,
402and
403.Fn i2d_EC_PUBKEY
404return the number of bytes successfully encoded or a negative value if
405an error occurs.
406.Pp
407.Fn i2d_ECPKParameters_bio ,
408.Fn i2d_ECPKParameters_fp ,
409.Fn i2d_ECPrivateKey_bio ,
410.Fn i2d_ECPrivateKey_fp ,
411.Fn ECPKParameters_print ,
412.Fn ECPKParameters_print_fp ,
413.Fn ECParameters_print ,
414.Fn ECParameters_print_fp ,
415.Fn i2d_EC_PUBKEY_bio ,
416and
417.Fn i2d_EC_PUBKEY_fp
418return 1 for success or 0 if an error occurs.
419.Sh SEE ALSO
420.Xr ASN1_item_d2i 3 ,
421.Xr EC_GROUP_copy 3 ,
422.Xr EC_GROUP_new 3 ,
423.Xr EC_KEY_new 3 ,
424.Xr EVP_PKEY_set1_EC_KEY 3 ,
425.Xr PEM_write_ECPrivateKey 3 ,
426.Xr PKCS8_PRIV_KEY_INFO_new 3 ,
427.Xr X509_PUBKEY_new 3
428.Sh STANDARDS
429RFC 5915: Elliptic Curve Private Key Structure
430.Pp
431RFC 5208: Public-Key Cryptography Standards (PKCS) #8:
432Private-Key Information Syntax Specification
433.Pp
434RFC 5280: Internet X.509 Public Key Infrastructure Certificate and
435Certificate Revocation List (CRL) Profile,
436section 4.1: Basic Certificate Fields
437.Sh HISTORY
438.Fn d2i_ECPKParameters ,
439.Fn i2d_ECPKParameters ,
440.Fn d2i_ECPKParameters_bio ,
441.Fn i2d_ECPKParameters_bio ,
442.Fn d2i_ECPKParameters_fP ,
443.Fn i2d_ECPKParameters_fp ,
444.Fn d2i_ECParameters ,
445.Fn i2d_ECParameters ,
446.Fn ECParameters_dup ,
447.Fn d2i_ECPrivateKey ,
448.Fn i2d_ECPrivateKey ,
449.Fn d2i_ECPrivateKey_bio ,
450.Fn i2d_ECPrivateKey_bio ,
451.Fn d2i_ECPrivateKey_fp ,
452.Fn i2d_ECPrivateKey_fp ,
453.Fn o2i_ECPublicKey ,
454.Fn i2o_ECPublicKey ,
455.Fn ECPKParameters_print ,
456.Fn ECPKParameters_print_fp ,
457.Fn ECParameters_print ,
458.Fn ECParameters_print_fp ,
459.Fn d2i_EC_PUBKEY ,
460.Fn i2d_EC_PUBKEY ,
461.Fn d2i_EC_PUBKEY_bio ,
462.Fn i2d_EC_PUBKEY_bio ,
463.Fn d2i_EC_PUBKEY_fp ,
464and
465.Fn i2d_EC_PUBKEY_fp
466first appeared in OpenSSL 0.9.8 and have been available since
467.Ox 4.5 .
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-12-23 17:28:38 +0000