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BN_bin2bn.3
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.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(*W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. 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No user-serviceable parts. . \" fudge factors for nroff and troff .if n \{\ . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] \fP .\} .if t \{\ . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff .if n \{\ . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} .if t \{\ . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' .ds 8 \h'\*(#H'\(*b\h'-\*(#H' .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] .ds ae a\h'-(\w'a'u*4/10)'e .ds Ae A\h'-(\w'A'u*4/10)'E . \" corrections for vroff .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' . \" for low resolution devices (crt and lpr) .if \n(.H>23 .if \n(.V>19 \ \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} .rm #[ #] #H #V #F C .\" ======================================================================== .\" .IX Title "BN_BN2BIN 3" .TH BN_BN2BIN 3 "2023-09-11" "1.1.1w" "OpenSSL" .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BN_bn2binpad, BN_bn2bin, BN_bin2bn, BN_bn2lebinpad, BN_lebin2bn, BN_bn2hex, BN_bn2dec, BN_hex2bn, BN_dec2bn, BN_print, BN_print_fp, BN_bn2mpi, BN_mpi2bn \- format conversions .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bn.h> \& \& int BN_bn2bin(const BIGNUM *a, unsigned char *to); \& int BN_bn2binpad(const BIGNUM *a, unsigned char *to, int tolen); \& BIGNUM *BN_bin2bn(const unsigned char *s, int len, BIGNUM *ret); \& \& int BN_bn2lebinpad(const BIGNUM *a, unsigned char *to, int tolen); \& BIGNUM *BN_lebin2bn(const unsigned char *s, int len, BIGNUM *ret); \& \& char *BN_bn2hex(const BIGNUM *a); \& char *BN_bn2dec(const BIGNUM *a); \& int BN_hex2bn(BIGNUM **a, const char *str); \& int BN_dec2bn(BIGNUM **a, const char *str); \& \& int BN_print(BIO *fp, const BIGNUM *a); \& int BN_print_fp(FILE *fp, const BIGNUM *a); \& \& int BN_bn2mpi(const BIGNUM *a, unsigned char *to); \& BIGNUM *BN_mpi2bn(unsigned char *s, int len, BIGNUM *ret); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBN_bn2bin()\fR converts the absolute value of \fBa\fR into big-endian form and stores it at \fBto\fR. \fBto\fR must point to BN_num_bytes(\fBa\fR) bytes of memory. .PP \&\fBBN_bn2binpad()\fR also converts the absolute value of \fBa\fR into big-endian form and stores it at \fBto\fR. \fBtolen\fR indicates the length of the output buffer \&\fBto\fR. The result is padded with zeros if necessary. If \fBtolen\fR is less than BN_num_bytes(\fBa\fR) an error is returned. .PP \&\fBBN_bin2bn()\fR converts the positive integer in big-endian form of length \&\fBlen\fR at \fBs\fR into a \fB\s-1BIGNUM\s0\fR and places it in \fBret\fR. If \fBret\fR is \&\s-1NULL,\s0 a new \fB\s-1BIGNUM\s0\fR is created. .PP \&\fBBN_bn2lebinpad()\fR and \fBBN_lebin2bn()\fR are identical to \fBBN_bn2binpad()\fR and \&\fBBN_bin2bn()\fR except the buffer is in little-endian format. .PP \&\fBBN_bn2hex()\fR and \fBBN_bn2dec()\fR return printable strings containing the hexadecimal and decimal encoding of \fBa\fR respectively. For negative numbers, the string is prefaced with a leading '\-'. The string must be freed later using \fBOPENSSL_free()\fR. .PP \&\fBBN_hex2bn()\fR takes as many characters as possible from the string \fBstr\fR, including the leading character '\-' which means negative, to form a valid hexadecimal number representation and converts them to a \fB\s-1BIGNUM\s0\fR and stores it in **\fBa\fR. If *\fBa\fR is \s-1NULL,\s0 a new \fB\s-1BIGNUM\s0\fR is created. If \&\fBa\fR is \s-1NULL,\s0 it only computes the length of valid representation. A \*(L"negative zero\*(R" is converted to zero. \&\fBBN_dec2bn()\fR is the same using the decimal system. .PP \&\fBBN_print()\fR and \fBBN_print_fp()\fR write the hexadecimal encoding of \fBa\fR, with a leading '\-' for negative numbers, to the \fB\s-1BIO\s0\fR or \fB\s-1FILE\s0\fR \&\fBfp\fR. .PP \&\fBBN_bn2mpi()\fR and \fBBN_mpi2bn()\fR convert \fB\s-1BIGNUM\s0\fRs from and to a format that consists of the number's length in bytes represented as a 4\-byte big-endian number, and the number itself in big-endian format, where the most significant bit signals a negative number (the representation of numbers with the \s-1MSB\s0 set is prefixed with null byte). .PP \&\fBBN_bn2mpi()\fR stores the representation of \fBa\fR at \fBto\fR, where \fBto\fR must be large enough to hold the result. The size can be determined by calling BN_bn2mpi(\fBa\fR, \s-1NULL\s0). .PP \&\fBBN_mpi2bn()\fR converts the \fBlen\fR bytes long representation at \fBs\fR to a \fB\s-1BIGNUM\s0\fR and stores it at \fBret\fR, or in a newly allocated \fB\s-1BIGNUM\s0\fR if \fBret\fR is \s-1NULL.\s0 .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBN_bn2bin()\fR returns the length of the big-endian number placed at \fBto\fR. \&\fBBN_bin2bn()\fR returns the \fB\s-1BIGNUM\s0\fR, \s-1NULL\s0 on error. .PP \&\fBBN_bn2binpad()\fR returns the number of bytes written or \-1 if the supplied buffer is too small. .PP \&\fBBN_bn2hex()\fR and \fBBN_bn2dec()\fR return a null-terminated string, or \s-1NULL\s0 on error. \fBBN_hex2bn()\fR and \fBBN_dec2bn()\fR return the number of characters used in parsing, or 0 on error, in which case no new \fB\s-1BIGNUM\s0\fR will be created. .PP \&\fBBN_print_fp()\fR and \fBBN_print()\fR return 1 on success, 0 on write errors. .PP \&\fBBN_bn2mpi()\fR returns the length of the representation. \fBBN_mpi2bn()\fR returns the \fB\s-1BIGNUM\s0\fR, and \s-1NULL\s0 on error. .PP The error codes can be obtained by \fBERR_get_error\fR\|(3). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBERR_get_error\fR\|(3), \fBBN_zero\fR\|(3), \&\fBASN1_INTEGER_to_BN\fR\|(3), \&\fBBN_num_bytes\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.