2 ''' $RCSfile$$Revision$$Date$
20 .ie \\n(.$>=3 .ne \\$3
36 ''' Set up \*(-- to give an unbreakable dash;
37 ''' string Tr holds user defined translation string.
38 ''' Bell System Logo is used as a dummy character.
44 .if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
45 .if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
48 ''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
49 ''' \*(L" and \*(R", except that they are used on ".xx" lines,
50 ''' such as .IP and .SH, which do another additional levels of
51 ''' double-quote interpretation
80 .\" If the F register is turned on, we'll generate
81 .\" index entries out stderr for the following things:
86 .\" X<> Xref (embedded
87 .\" Of course, you have to process the output yourself
88 .\" in some meaninful fashion.
91 .tm Index:\\$1\t\\n%\t"\\$2"
96 .TH BN_bn2bin 3 "0.9.7d" "2/Sep/2004" "OpenSSL"
100 .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
101 .de CQ \" put $1 in typewriter font
107 \\&\\$2 \\$3 \\$4 \\$5 \\$6 \\$7
110 .\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
111 . \" AM - accent mark definitions
113 . \" fudge factors for nroff and troff
122 . ds #H ((1u-(\\\\n(.fu%2u))*.13m)
128 . \" simple accents for nroff and troff
141 . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
142 . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
143 . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
144 . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
145 . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
146 . ds ? \s-2c\h'-\w'c'u*7/10'\u\h'\*(#H'\zi\d\s+2\h'\w'c'u*8/10'
147 . ds ! \s-2\(or\s+2\h'-\w'\(or'u'\v'-.8m'.\v'.8m'
148 . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
149 . ds q o\h'-\w'o'u*8/10'\s-4\v'.4m'\z\(*i\v'-.4m'\s+4\h'\w'o'u*8/10'
151 . \" troff and (daisy-wheel) nroff accents
152 .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
153 .ds 8 \h'\*(#H'\(*b\h'-\*(#H'
154 .ds v \\k:\h'-(\\n(.wu*9/10-\*(#H)'\v'-\*(#V'\*(#[\s-4v\s0\v'\*(#V'\h'|\\n:u'\*(#]
155 .ds _ \\k:\h'-(\\n(.wu*9/10-\*(#H+(\*(#F*2/3))'\v'-.4m'\z\(hy\v'.4m'\h'|\\n:u'
156 .ds . \\k:\h'-(\\n(.wu*8/10)'\v'\*(#V*4/10'\z.\v'-\*(#V*4/10'\h'|\\n:u'
157 .ds 3 \*(#[\v'.2m'\s-2\&3\s0\v'-.2m'\*(#]
158 .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
159 .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
160 .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
161 .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
162 .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
163 .ds ae a\h'-(\w'a'u*4/10)'e
164 .ds Ae A\h'-(\w'A'u*4/10)'E
165 .ds oe o\h'-(\w'o'u*4/10)'e
166 .ds Oe O\h'-(\w'O'u*4/10)'E
167 . \" corrections for vroff
168 .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
169 .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
170 . \" for low resolution devices (crt and lpr)
171 .if \n(.H>23 .if \n(.V>19 \
175 . ds v \h'-1'\o'\(aa\(ga'
191 BN_bn2bin, BN_bin2bn, BN_bn2hex, BN_bn2dec, BN_hex2bn, BN_dec2bn,
192 BN_print, BN_print_fp, BN_bn2mpi, BN_mpi2bn \- format conversions
196 \& #include <openssl/bn.h>
199 \& int BN_bn2bin(const BIGNUM *a, unsigned char *to);
200 \& BIGNUM *BN_bin2bn(const unsigned char *s, int len, BIGNUM *ret);
203 \& char *BN_bn2hex(const BIGNUM *a);
204 \& char *BN_bn2dec(const BIGNUM *a);
205 \& int BN_hex2bn(BIGNUM **a, const char *str);
206 \& int BN_dec2bn(BIGNUM **a, const char *str);
209 \& int BN_print(BIO *fp, const BIGNUM *a);
210 \& int BN_print_fp(FILE *fp, const BIGNUM *a);
213 \& int BN_bn2mpi(const BIGNUM *a, unsigned char *to);
214 \& BIGNUM *BN_mpi2bn(unsigned char *s, int len, BIGNUM *ret);
217 \fIBN_bn2bin()\fR converts the absolute value of \fBa\fR into big-endian form
218 and stores it at \fBto\fR. \fBto\fR must point to \fIBN_num_bytes\fR\|(\fBa\fR) bytes of
221 \fIBN_bin2bn()\fR converts the positive integer in big-endian form of length
222 \fBlen\fR at \fBs\fR into a \fBBIGNUM\fR and places it in \fBret\fR. If \fBret\fR is
223 NULL, a new \fBBIGNUM\fR is created.
225 \fIBN_bn2hex()\fR and \fIBN_bn2dec()\fR return printable strings containing the
226 hexadecimal and decimal encoding of \fBa\fR respectively. For negative
227 numbers, the string is prefaced with a leading \*(L'\-\*(R'. The string must be
228 freed later using \fIOPENSSL_free()\fR.
230 \fIBN_hex2bn()\fR converts the string \fBstr\fR containing a hexadecimal number
231 to a \fBBIGNUM\fR and stores it in **\fBbn\fR. If *\fBbn\fR is NULL, a new
232 \fBBIGNUM\fR is created. If \fBbn\fR is NULL, it only computes the number's
233 length in hexadecimal digits. If the string starts with \*(L'\-\*(R', the
234 number is negative. \fIBN_dec2bn()\fR is the same using the decimal system.
236 \fIBN_print()\fR and \fIBN_print_fp()\fR write the hexadecimal encoding of \fBa\fR,
237 with a leading \*(L'\-\*(R' for negative numbers, to the \fBBIO\fR or \fBFILE\fR
240 \fIBN_bn2mpi()\fR and \fIBN_mpi2bn()\fR convert \fBBIGNUM\fRs from and to a format
241 that consists of the number's length in bytes represented as a 4-byte
242 big-endian number, and the number itself in big-endian format, where
243 the most significant bit signals a negative number (the representation
244 of numbers with the MSB set is prefixed with null byte).
246 \fIBN_bn2mpi()\fR stores the representation of \fBa\fR at \fBto\fR, where \fBto\fR
247 must be large enough to hold the result. The size can be determined by
248 calling \fIBN_bn2mpi\fR\|(\fBa\fR, NULL).
250 \fIBN_mpi2bn()\fR converts the \fBlen\fR bytes long representation at \fBs\fR to
251 a \fBBIGNUM\fR and stores it at \fBret\fR, or in a newly allocated \fBBIGNUM\fR
252 if \fBret\fR is NULL.
254 \fIBN_bn2bin()\fR returns the length of the big-endian number placed at \fBto\fR.
255 \fIBN_bin2bn()\fR returns the \fBBIGNUM\fR, NULL on error.
257 \fIBN_bn2hex()\fR and \fIBN_bn2dec()\fR return a null-terminated string, or NULL
258 on error. \fIBN_hex2bn()\fR and \fIBN_dec2bn()\fR return the number's length in
259 hexadecimal or decimal digits, and 0 on error.
261 \fIBN_print_fp()\fR and \fIBN_print()\fR return 1 on success, 0 on write errors.
263 \fIBN_bn2mpi()\fR returns the length of the representation. \fIBN_mpi2bn()\fR
264 returns the \fBBIGNUM\fR, and NULL on error.
266 The error codes can be obtained by ERR_get_error(3).
268 bn(3), ERR_get_error(3), BN_zero(3),
269 ASN1_INTEGER_to_BN(3),
272 \fIBN_bn2bin()\fR, \fIBN_bin2bn()\fR, \fIBN_print_fp()\fR and \fIBN_print()\fR are available
273 in all versions of SSLeay and OpenSSL.
275 \fIBN_bn2hex()\fR, \fIBN_bn2dec()\fR, \fIBN_hex2bn()\fR, \fIBN_dec2bn()\fR, \fIBN_bn2mpi()\fR and
276 \fIBN_mpi2bn()\fR were added in SSLeay 0.9.0.
279 .IX Title "BN_bn2bin 3"
280 .IX Name "BN_bn2bin, BN_bin2bn, BN_bn2hex, BN_bn2dec, BN_hex2bn, BN_dec2bn,
281 BN_print, BN_print_fp, BN_bn2mpi, BN_mpi2bn - format conversions"
285 .IX Header "SYNOPSIS"
287 .IX Header "DESCRIPTION"
289 .IX Header "RETURN VALUES"
291 .IX Header "SEE ALSO"