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1.\" $OpenBSD: ECDSA_SIG_new.3,v 1.21 2024/11/15 20:14:58 tb Exp $
2.\" full merge up to: OpenSSL e9b77246 Jan 20 19:58:49 2017 +0100
3.\" selective merge up to: OpenSSL da4ea0cf Aug 5 16:13:24 2019 +0100
4.\"
5.\" This file was written by Nils Larsch <nils@openssl.org>.
6.\" Copyright (c) 2004, 2005, 2013, 2016 The OpenSSL Project.
7.\" All rights reserved.
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53.Dd $Mdocdate: November 15 2024 $
54.Dt ECDSA_SIG_NEW 3
55.Os
56.Sh NAME
57.Nm ECDSA_SIG_new ,
58.Nm ECDSA_SIG_free ,
59.Nm ECDSA_SIG_get0 ,
60.Nm ECDSA_SIG_get0_r ,
61.Nm ECDSA_SIG_get0_s ,
62.Nm ECDSA_SIG_set0 ,
63.Nm i2d_ECDSA_SIG ,
64.Nm d2i_ECDSA_SIG ,
65.Nm ECDSA_size ,
66.Nm ECDSA_sign ,
67.Nm ECDSA_verify ,
68.Nm ECDSA_do_sign ,
69.Nm ECDSA_do_verify
70.Nd Elliptic Curve Digital Signature Algorithm
71.Sh SYNOPSIS
72.In openssl/ec.h
73.Ft ECDSA_SIG*
74.Fo ECDSA_SIG_new
75.Fa void
76.Fc
77.Ft void
78.Fo ECDSA_SIG_free
79.Fa "ECDSA_SIG *sig"
80.Fc
81.Ft void
82.Fo ECDSA_SIG_get0
83.Fa "const ECDSA_SIG *sig"
84.Fa "const BIGNUM **r"
85.Fa "const BIGNUM **s"
86.Fc
87.Ft "const BIGNUM *"
88.Fo ECDSA_SIG_get0_r
89.Fa "const ECDSA_SIG *sig"
90.Fc
91.Ft "const BIGNUM *"
92.Fo ECDSA_SIG_get0_s
93.Fa "const ECDSA_SIG *sig"
94.Fc
95.Ft int
96.Fo ECDSA_SIG_set0
97.Fa "ECDSA_SIG *sig"
98.Fa "BIGNUM *r"
99.Fa "BIGNUM *s"
100.Fc
101.Ft int
102.Fo i2d_ECDSA_SIG
103.Fa "const ECDSA_SIG *sig_in"
104.Fa "unsigned char **der_out"
105.Fc
106.Ft ECDSA_SIG*
107.Fo d2i_ECDSA_SIG
108.Fa "ECDSA_SIG **sig_out"
109.Fa "const unsigned char **der_in"
110.Fa "long len"
111.Fc
112.Ft int
113.Fo ECDSA_size
114.Fa "const EC_KEY *eckey"
115.Fc
116.Ft int
117.Fo ECDSA_sign
118.Fa "int type"
119.Fa "const unsigned char *dgst"
120.Fa "int dgstlen"
121.Fa "unsigned char *sig"
122.Fa "unsigned int *siglen"
123.Fa "EC_KEY *eckey"
124.Fc
125.Ft int
126.Fo ECDSA_verify
127.Fa "int type"
128.Fa "const unsigned char *dgst"
129.Fa "int dgstlen"
130.Fa "const unsigned char *sig"
131.Fa "int siglen"
132.Fa "EC_KEY *eckey"
133.Fc
134.Ft ECDSA_SIG*
135.Fo ECDSA_do_sign
136.Fa "const unsigned char *dgst"
137.Fa "int dgst_len"
138.Fa "EC_KEY *eckey"
139.Fc
140.Ft int
141.Fo ECDSA_do_verify
142.Fa "const unsigned char *dgst"
143.Fa "int dgst_len"
144.Fa "const ECDSA_SIG *sig"
145.Fa "EC_KEY* eckey"
146.Fc
147.Sh DESCRIPTION
148These functions provide a low level interface to ECDSA.
149Most applications should use the higher level EVP interface such as
150.Xr EVP_DigestSignInit 3
151or
152.Xr EVP_DigestVerifyInit 3
153instead.
154Creation of the required
155.Vt EC_KEY
156objects is described in
157.Xr EC_KEY_new 3 .
158.Pp
159The
160.Vt ECDSA_SIG
161structure consists of two
162.Vt BIGNUM Ns s
163for the
164.Fa r
165and
166.Fa s
167value of an ECDSA signature (see X9.62 or FIPS 186-2).
168.Bd -literal -offset indent
169struct {
170 BIGNUM *r;
171 BIGNUM *s;
172} ECDSA_SIG;
173.Ed
174.Pp
175.Fn ECDSA_SIG_new
176allocates a new
177.Vt ECDSA_SIG
178structure (note: this function also allocates the
179.Vt BIGNUM Ns s )
180and initializes it.
181.Pp
182.Fn ECDSA_SIG_free
183frees the
184.Vt ECDSA_SIG
185structure
186.Fa sig .
187.Pp
188.Fn ECDSA_SIG_get0
189retrieves internal pointers the
190.Fa r
191and
192.Fa s
193values contained in
194.Fa sig .
195The values
196.Fa r
197and
198.Fa s
199can also be retrieved separately by the corresponding function
200.Fn ECDSA_SIG_get0_r
201and
202.Fn ECDSA_SIG_get0_s ,
203respectively.
204.Pp
205.Fn ECDSA_SIG_set0
206sets the
207.Fa r
208and
209.Fa s
210values in
211.Fa sig .
212Calling this function transfers the memory management of the values to
213.Fa sig .
214Therefore, the values that have been passed in
215should not be freed by the caller.
216.Pp
217.Fn i2d_ECDSA_SIG
218creates the DER encoding of the ECDSA signature
219.Fa sig_in
220and writes the encoded signature to
221.Pf * Fa der_out .
222.Fn d2i_ECDSA_SIG
223decodes the DER-encoded signature stored in the buffer
224.Pf * Fa der_in
225which is
226.Fa len
227bytes long into
228.Pf * Fa sig_out .
229For details about the semantics, examples, caveats, and bugs, see
230.Xr ASN1_item_d2i 3 .
231.Pp
232.Fn ECDSA_size
233returns the maximum length of a DER-encoded ECDSA signature created with
234the private EC key
235.Fa eckey .
236.Pp
237.Fn ECDSA_sign
238computes a digital signature of the
239.Fa dgstlen
240bytes hash value
241.Fa dgst
242using the private EC key
243.Fa eckey .
244The DER-encoded signature is stored in
245.Fa sig
246and its length is returned in
247.Fa siglen .
248Note:
249.Fa sig
250must point to
251.Fn ECDSA_size
252bytes of memory.
253The parameter
254.Fa type
255is ignored.
256.Pp
257.Fn ECDSA_verify
258verifies that the signature in
259.Fa sig
260of size
261.Fa siglen
262is a valid ECDSA signature of the hash value
263.Fa dgst
264of size
265.Fa dgstlen
266using the public key
267.Fa eckey .
268The parameter
269.Fa type
270is ignored.
271.Pp
272.Fn ECDSA_do_sign
273computes a digital signature of the
274.Fa dgst_len
275bytes hash value
276.Fa dgst
277using the private key
278.Fa eckey .
279The signature is returned in a newly allocated
280.Vt ECDSA_SIG
281structure (or
282.Dv NULL
283on error).
284.Pp
285.Fn ECDSA_do_verify
286verifies that the signature
287.Fa sig
288is a valid ECDSA signature of the hash value
289.Fa dgst
290of size
291.Fa dgst_len
292using the public key
293.Fa eckey .
294.Sh RETURN VALUES
295.Fn ECDSA_SIG_new
296returns the new
297.Vt ECDSA_SIG
298object or
299.Dv NULL
300if an error occurs.
301.Pp
302.Fn i2d_ECDSA_SIG
303returns the number of bytes successfully encoded
304or a negative value if an error occurs.
305.Pp
306.Fn d2i_ECDSA_SIG
307returns a pointer to the decoded
308.Vt ECDSA_SIG
309structure or
310.Dv NULL
311if an error occurs.
312.Pp
313.Fn ECDSA_size
314returns the maximum length signature or 0 on error.
315.Pp
316.Fn ECDSA_SIG_get0_r
317and
318.Fn ECDSA_SIG_get0_s
319return a pointer owned by the
320.Vt ECDSA_SIG
321object if it has been set or
322.Dv NULL
323otherwise.
324.Pp
325.Fn ECDSA_SIG_set0
326and
327.Fn ECDSA_sign
328return 1 if successful or 0 on error.
329.Pp
330.Fn ECDSA_do_sign
331returns a pointer to an allocated
332.Vt ECDSA_SIG
333structure or
334.Dv NULL
335on error.
336.Pp
337.Fn ECDSA_verify
338and
339.Fn ECDSA_do_verify
340return 1 for a valid signature, 0 for an invalid signature and -1 on
341error.
342The error codes can be obtained by
343.Xr ERR_get_error 3 .
344.Sh EXAMPLES
345Creating an ECDSA signature of given SHA-384 hash value using the named
346curve secp384r1.
347.Pp
348First step: create an
349.Vt EC_KEY
350object.
351This part is
352.Em not
353ECDSA specific.
354.Bd -literal -offset indent
355int ret;
356ECDSA_SIG *sig;
357EC_KEY *eckey;
358
359eckey = EC_KEY_new_by_curve_name(NID_secp384r1);
360if (eckey == NULL) {
361 /* error */
362}
363if (!EC_KEY_generate_key(eckey)) {
364 /* error */
365}
366.Ed
367.Pp
368Second step: compute the ECDSA signature of a SHA-384 hash value using
369.Fn ECDSA_do_sign
370.Bd -literal -offset indent
371sig = ECDSA_do_sign(digest, SHA384_DIGEST_LENGTH, eckey);
372if (sig == NULL) {
373 /* error */
374}
375.Ed
376.Pp
377or using
378.Fn ECDSA_sign
379.Bd -literal -offset indent
380unsigned char *buffer, *pp;
381int buf_len;
382
383buf_len = ECDSA_size(eckey);
384buffer = malloc(buf_len);
385pp = buffer;
386if (!ECDSA_sign(0, dgst, dgstlen, pp, &buf_len, eckey) {
387 /* error */
388}
389.Ed
390.Pp
391Third step: verify the created ECDSA signature using
392.Fn ECDSA_do_verify
393.Pp
394.Dl ret = ECDSA_do_verify(digest, SHA384_DIGEST_LENGTH, sig, eckey);
395.Pp
396or using
397.Fn ECDSA_verify
398.Pp
399.Dl ret = ECDSA_verify(0, digest, SHA384_DIGEST_LENGTH, buffer, buf_len, eckey);
400.Pp
401and finally evaluate the return value:
402.Bd -literal -offset indent
403if (ret == -1) {
404 /* error */
405} else if (ret == 0) {
406 /* incorrect signature */
407} else {
408 /* ret == 1 */
409 /* signature ok */
410}
411.Ed
412.Sh SEE ALSO
413.Xr crypto 3 ,
414.Xr d2i_ECPKParameters 3 ,
415.Xr DSA_new 3 ,
416.Xr EC_GROUP_new 3 ,
417.Xr EC_KEY_METHOD_new 3 ,
418.Xr EC_KEY_new 3 ,
419.Xr EC_KEY_set_ex_data 3 ,
420.Xr EVP_DigestSignInit 3 ,
421.Xr EVP_DigestVerifyInit 3 ,
422.Xr RSA_new 3
423.Sh STANDARDS
424ANSI X9.62, US Federal Information Processing Standard FIPS 186-5
425(Digital Signature Standard, DSS)
426.Sh HISTORY
427.Fn ECDSA_SIG_new ,
428.Fn ECDSA_SIG_free ,
429.Fn i2d_ECDSA_SIG ,
430.Fn d2i_ECDSA_SIG ,
431.Fn ECDSA_size ,
432.Fn ECDSA_sign ,
433.Fn ECDSA_verify ,
434.Fn ECDSA_do_sign ,
435and
436.Fn ECDSA_do_verify
437first appeared in OpenSSL 0.9.8 and have been available since
438.Ox 4.5 .
439.Pp
440.Fn ECDSA_SIG_get0
441and
442.Fn ECDSA_SIG_set0
443first appeared in OpenSSL 1.1.0 and have been available since
444.Ox 6.3 .
445.Fn ECDSA_SIG_get0_r
446and
447.Fn ECDSA_SIG_get0_s
448first appeared in OpenSSL 1.1.1 and have been available since
449.Ox 7.1 .
450.Sh AUTHORS
451.An Nils Larsch
452for the OpenSSL project.
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-12-23 19:34:15 +0000