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1.\" $OpenBSD: BN_bn2bin.3,v 1.16 2023/07/09 06:45:03 tb Exp $
2.\" full merge up to: OpenSSL 24a535ea Sep 22 13:14:20 2020 +0100
3.\"
4.\" This file was written by Ulf Moeller <ulf@openssl.org>
5.\" and Dr. Stephen Henson <steve@openssl.org>.
6.\" Copyright (c) 2000, 2002, 2016 The OpenSSL Project. All rights reserved.
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52.Dd $Mdocdate: July 9 2023 $
53.Dt BN_BN2BIN 3
54.Os
55.Sh NAME
56.Nm BN_bn2bin ,
57.Nm BN_bn2binpad ,
58.Nm BN_bin2bn ,
59.Nm BN_bn2lebinpad ,
60.Nm BN_lebin2bn ,
61.Nm BN_bn2hex ,
62.Nm BN_bn2dec ,
63.Nm BN_hex2bn ,
64.Nm BN_dec2bn ,
65.Nm BN_asc2bn ,
66.Nm BN_print ,
67.Nm BN_print_fp ,
68.Nm BN_bn2mpi ,
69.Nm BN_mpi2bn
70.Nd format conversions
71.Sh SYNOPSIS
72.In openssl/bn.h
73.Ft int
74.Fo BN_bn2bin
75.Fa "const BIGNUM *a"
76.Fa "unsigned char *to"
77.Fc
78.Ft int
79.Fo BN_bn2binpad
80.Fa "const BIGNUM *a"
81.Fa "unsigned char *to"
82.Fa "int tolen"
83.Fc
84.Ft BIGNUM *
85.Fo BN_bin2bn
86.Fa "const unsigned char *s"
87.Fa "int len"
88.Fa "BIGNUM *ret"
89.Fc
90.Ft int
91.Fo BN_bn2lebinpad
92.Fa "const BIGNUM *a"
93.Fa "unsigned char *to"
94.Fa "int tolen"
95.Fc
96.Ft BIGNUM *
97.Fo BN_lebin2bn
98.Fa "const unsigned char *s"
99.Fa "int len"
100.Fa "BIGNUM *ret"
101.Fc
102.Ft char *
103.Fo BN_bn2hex
104.Fa "const BIGNUM *a"
105.Fc
106.Ft char *
107.Fo BN_bn2dec
108.Fa "const BIGNUM *a"
109.Fc
110.Ft int
111.Fo BN_hex2bn
112.Fa "BIGNUM **ap"
113.Fa "const char *str"
114.Fc
115.Ft int
116.Fo BN_dec2bn
117.Fa "BIGNUM **ap"
118.Fa "const char *str"
119.Fc
120.Ft int
121.Fo BN_asc2bn
122.Fa "BIGNUM **ap"
123.Fa "const char *str"
124.Fc
125.Ft int
126.Fo BN_print
127.Fa "BIO *fp"
128.Fa "const BIGNUM *a"
129.Fc
130.Ft int
131.Fo BN_print_fp
132.Fa "FILE *fp"
133.Fa "const BIGNUM *a"
134.Fc
135.Ft int
136.Fo BN_bn2mpi
137.Fa "const BIGNUM *a"
138.Fa "unsigned char *to"
139.Fc
140.Ft BIGNUM *
141.Fo BN_mpi2bn
142.Fa "unsigned char *s"
143.Fa "int len"
144.Fa "BIGNUM *ret"
145.Fc
146.Sh DESCRIPTION
147.Fn BN_bn2bin
148converts the absolute value of
149.Fa a
150into big-endian form and stores it at
151.Fa to .
152.Fa to
153must point to
154.Fn BN_num_bytes a
155bytes of memory.
156.Pp
157.Fn BN_bn2binpad
158also converts the absolute value of
159.Fa a
160into big-endian form and stores it at
161.Fa to .
162.Fa tolen
163indicates the length of the output buffer
164.Pf * Fa to .
165The result is padded with zeros if necessary.
166If
167.Fa tolen
168is less than
169.Fn BN_num_bytes a ,
170an error is returned.
171.Pp
172.Fn BN_bin2bn
173converts the positive integer in big-endian form of length
174.Fa len
175at
176.Fa s
177into a
178.Vt BIGNUM
179and places it in
180.Fa ret .
181If
182.Fa ret
183is
184.Dv NULL ,
185a new
186.Vt BIGNUM
187is created.
188.Pp
189.Fn BN_bn2lebinpad
190and
191.Fn BN_lebin2bn
192are identical to
193.Fn BN_bn2binpad
194and
195.Fn BN_bin2bn
196except the buffer
197.Pf * Fa to
198is in little-endian format.
199.Pp
200.Fn BN_bn2hex
201and
202.Fn BN_bn2dec
203return printable strings containing the hexadecimal and decimal encoding of
204.Fa a
205respectively.
206For negative numbers, the string is prefaced with a leading minus sign.
207The string must be freed later using
208.Xr free 3 .
209.Pp
210.Fn BN_hex2bn
211interprets
212.Fa str
213as a hexadecimal number.
214The string may start with a minus sign
215.Pq Sq - .
216Conversion stops at the first byte that is not a hexadecimal digit.
217The number is converted to a
218.Vt BIGNUM
219and stored in
220.Pf ** Fa ap .
221If
222.Pf * Fa ap
223is
224.Dv NULL ,
225a new
226.Vt BIGNUM
227is created.
228If
229.Fa ap
230is
231.Dv NULL ,
232it only computes the number's length in hexadecimal digits,
233also counting the leading minus sign if there is one.
234A "negative zero" is converted to zero.
235.Fn BN_dec2bn
236is the same using the decimal system.
237.Fn BN_asc2bn
238infers the number base from an optional prefix.
239If
240.Fa str
241starts with
242.Qq 0x
243or
244.Qq 0X ,
245it calls
246.Fn BN_hex2bn ,
247otherwise
248.Fn BN_dec2bn .
249If the number is negative, the minus sign can be given before or
250after the prefix.
251.Pp
252.Fn BN_print
253and
254.Fn BN_print_fp
255write the hexadecimal encoding of
256.Fa a ,
257with a leading minus sign for negative numbers, to the
258.Vt BIO
259or
260.Vt FILE
261.Fa fp .
262.Pp
263.Fn BN_bn2mpi
264and
265.Fn BN_mpi2bn
266convert
267.Vt BIGNUM Ns s
268from and to a format that consists of the number's length in bytes
269represented as a 4-byte big-endian number, and the number itself in
270big-endian format, where the most significant bit signals a negative
271number (the representation of numbers with the MSB set is prefixed with
272a NUL byte).
273.Pp
274.Fn BN_bn2mpi
275stores the representation of
276.Fa a
277at
278.Fa to ,
279where
280.Pf * Fa to
281must be large enough to hold the result.
282The size can be determined by calling
283.Fn BN_bn2mpi a NULL .
284.Pp
285.Fn BN_mpi2bn
286converts the
287.Fa len
288bytes long representation at
289.Fa s
290to a
291.Vt BIGNUM
292and stores it at
293.Fa ret ,
294or in a newly allocated
295.Vt BIGNUM
296if
297.Fa ret
298is
299.Dv NULL .
300.Sh RETURN VALUES
301.Fn BN_bn2bin
302returns the length of the big-endian number placed at
303.Fa to .
304.Pp
305.Fn BN_bn2binpad
306and
307.Fn BN_bn2lebinpad
308return the number of bytes written
309or \-1 if the supplied buffer is too small.
310.Pp
311.Fn BN_bin2bn
312and
313.Fn BN_lebin2bn
314return the
315.Vt BIGNUM ,
316or
317.Dv NULL
318on error.
319.Pp
320.Fn BN_bn2hex
321and
322.Fn BN_bn2dec
323return a NUL-terminated string, or
324.Dv NULL
325on error.
326.Fn BN_hex2bn
327and
328.Fn BN_dec2bn
329return the number's length in hexadecimal or decimal digits,
330also counting the leading minus sign if there is one,
331or 0 on error, in which case no new
332.Vt BIGNUM
333is created.
334.Fn BN_asc2bn
335returns 1 on success or 0 on error, in which case no new
336.Vt BIGNUM
337is created.
338.Pp
339.Fn BN_print_fp
340and
341.Fn BN_print
342return 1 on success, 0 on write errors.
343.Pp
344.Fn BN_bn2mpi
345returns the length of the representation.
346.Fn BN_mpi2bn
347returns the
348.Vt BIGNUM ,
349or
350.Dv NULL
351on error.
352.Pp
353The error codes can be obtained by
354.Xr ERR_get_error 3 .
355.Sh SEE ALSO
356.Xr ASN1_INTEGER_to_BN 3 ,
357.Xr BN_new 3 ,
358.Xr BN_num_bytes 3 ,
359.Xr BN_zero 3
360.Sh HISTORY
361.Fn BN_bn2bin ,
362.Fn BN_bin2bn ,
363and
364.Fn BN_print
365first appeared in SSLeay 0.5.1.
366.Fn BN_print_fp
367first appeared in SSLeay 0.6.0.
368.Fn BN_bn2hex ,
369.Fn BN_bn2dec ,
370.Fn BN_hex2bn ,
371.Fn BN_dec2bn ,
372.Fn BN_bn2mpi ,
373and
374.Fn BN_mpi2bn
375first appeared in SSLeay 0.9.0.
376All these functions have been available since
377.Ox 2.4 .
378.Pp
379.Fn BN_asc2bin
380first appeared in OpenSSL 1.0.0 and has been available since
381.Ox 4.9 .
382.Pp
383.Fn BN_bn2binpad ,
384.Fn BN_bn2lebinpad ,
385and
386.Fn BN_lebin2bn
387first appeared in OpenSSL 1.1.0 and have been available since
388.Ox 7.0 .
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-12-23 21:13:22 +0000