295 lines
8.1 KiB
Groff
295 lines
8.1 KiB
Groff
.rn '' }`
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'''
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'''
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.de Sh
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.br
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.de Sp
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'''
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'''
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''' Set up \*(-- to give an unbreakable dash;
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''' string Tr holds user defined translation string.
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''' Bell System Logo is used as a dummy character.
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'''
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.tr \(*W-|\(bv\*(Tr
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.ie n \{\
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.ds -- \(*W-
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.ds PI pi
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.if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
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''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
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''' \*(L" and \*(R", except that they are used on ".xx" lines,
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''' such as .IP and .SH, which do another additional levels of
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''' double-quote interpretation
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.\" If the F register is turned on, we'll generate
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.\" index entries out stderr for the following things:
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.\" TH Title
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.\" SH Header
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.\" Sh Subsection
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.\" Ip Item
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.\" X<> Xref (embedded
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.\" Of course, you have to process the output yourself
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.\" in some meaninful fashion.
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.if \nF \{
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.nr % 0
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.rr F
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.\}
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.TH BN_bn2bin 3 "0.9.5a" "22/Jul/2000" "OpenSSL"
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.UC
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.if n .hy 0
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.if n .na
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.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
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.ft CW
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'if n "\c
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'if t \\&\\$1\c
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'if n \\&\\$1\c
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\\&\\$2 \\$3 \\$4 \\$5 \\$6 \\$7
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..
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.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
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. \" AM - accent mark definitions
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\{\
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.\}
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.rm #[ #] #H #V #F C
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.SH "NAME"
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BN_bn2bin, BN_bin2bn, BN_bn2hex, BN_bn2dec, BN_hex2bn, BN_dec2bn,
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BN_print, BN_print_fp, BN_bn2mpi, BN_mpi2bn \- format conversions
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.PP
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.Vb 1
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\& #include <openssl/bn.h>
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.Ve
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.Vb 2
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\& int BN_bn2bin(const BIGNUM *a, unsigned char *to);
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\& BIGNUM *BN_bin2bn(const unsigned char *s, int len, BIGNUM *ret);
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.Ve
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.Vb 4
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\& char *BN_bn2hex(const BIGNUM *a);
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\& char *BN_bn2dec(const BIGNUM *a);
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\& int BN_hex2bn(BIGNUM **a, const char *str);
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\& int BN_dec2bn(BIGNUM **a, const char *str);
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.Ve
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.Vb 2
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\& int BN_print(BIO *fp, const BIGNUM *a);
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\& int BN_print_fp(FILE *fp, const BIGNUM *a);
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.Ve
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.Vb 2
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\& int BN_bn2mpi(const BIGNUM *a, unsigned char *to);
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\& BIGNUM *BN_mpi2bn(unsigned char *s, int len, BIGNUM *ret);
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.Ve
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.SH "DESCRIPTION"
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\fIBN_bn2bin()\fR converts the absolute value of \fBa\fR into big-endian form
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and stores it at \fBto\fR. \fBto\fR must point to \fIBN_num_bytes\fR\|(\fBa\fR) bytes of
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memory.
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.PP
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\fIBN_bin2bn()\fR converts the positive integer in big-endian form of length
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\fBlen\fR at \fBs\fR into a \fBBIGNUM\fR and places it in \fBret\fR. If \fBret\fR is
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NULL, a new \fBBIGNUM\fR is created.
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.PP
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\fIBN_bn2hex()\fR and \fIBN_bn2dec()\fR return printable strings containing the
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hexadecimal and decimal encoding of \fBa\fR respectively. For negative
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numbers, the string is prefaced with a leading \*(L'\-\*(R'. The string must be
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\fIFree()\fRd later.
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.PP
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\fIBN_hex2bn()\fR converts the string \fBstr\fR containing a hexadecimal number
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to a \fBBIGNUM\fR and stores it in **\fBbn\fR. If *\fBbn\fR is NULL, a new
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\fBBIGNUM\fR is created. If \fBbn\fR is NULL, it only computes the number's
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length in hexadecimal digits. If the string starts with \*(L'\-\*(R', the
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number is negative. \fIBN_dec2bn()\fR is the same using the decimal system.
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.PP
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\fIBN_print()\fR and \fIBN_print_fp()\fR write the hexadecimal encoding of \fBa\fR,
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with a leading \*(L'\-\*(R' for negative numbers, to the \fBBIO\fR or \fBFILE\fR
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\fBfp\fR.
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.PP
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\fIBN_bn2mpi()\fR and \fIBN_mpi2bn()\fR convert \fBBIGNUM\fRs from and to a format
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that consists of the number's length in bytes represented as a 3-byte
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big-endian number, and the number itself in big-endian format, where
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the most significant bit signals a negative number (the representation
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of numbers with the MSB set is prefixed with null byte).
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.PP
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\fIBN_bn2mpi()\fR stores the representation of \fBa\fR at \fBto\fR, where \fBto\fR
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must be large enough to hold the result. The size can be determined by
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calling \fIBN_bn2mpi\fR\|(\fBa\fR, NULL).
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.PP
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\fIBN_mpi2bn()\fR converts the \fBlen\fR bytes long representation at \fBs\fR to
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a \fBBIGNUM\fR and stores it at \fBret\fR, or in a newly allocated \fBBIGNUM\fR
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if \fBret\fR is NULL.
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.SH "RETURN VALUES"
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\fIBN_bn2bin()\fR returns the length of the big-endian number placed at \fBto\fR.
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\fIBN_bin2bn()\fR returns the \fBBIGNUM\fR, NULL on error.
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.PP
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\fIBN_bn2hex()\fR and \fIBN_bn2dec()\fR return a null-terminated string, or NULL
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on error. \fIBN_hex2bn()\fR and \fIBN_dec2bn()\fR return the number's length in
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hexadecimal or decimal digits, and 0 on error.
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.PP
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\fIBN_print_fp()\fR and \fIBN_print()\fR return 1 on success, 0 on write errors.
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.PP
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\fIBN_bn2mpi()\fR returns the length of the representation. \fIBN_mpi2bn()\fR
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returns the \fBBIGNUM\fR, and NULL on error.
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.PP
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The error codes can be obtained by the \fIERR_get_error(3)|ERR_get_error(3)\fR manpage.
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.SH "SEE ALSO"
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the \fIbn(3)|bn(3)\fR manpage, the \fIerr(3)|err(3)\fR manpage, the \fIBN_zero(3)|BN_zero(3)\fR manpage,
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the \fIASN1_INTEGER_to_BN(3)|ASN1_INTEGER_to_BN(3)\fR manpage,
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the \fIBN_num_bytes(3)|BN_num_bytes(3)\fR manpage
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.SH "HISTORY"
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\fIBN_bn2bin()\fR, \fIBN_bin2bn()\fR, \fIBN_print_fp()\fR and \fIBN_print()\fR are available
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in all versions of SSLeay and OpenSSL.
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.PP
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\fIBN_bn2hex()\fR, \fIBN_bn2dec()\fR, \fIBN_hex2bn()\fR, \fIBN_dec2bn()\fR, \fIBN_bn2mpi()\fR and
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\fIBN_mpi2bn()\fR were added in SSLeay 0.9.0.
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.rn }` ''
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.IX Title "BN_bn2bin 3"
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.IX Name "BN_bn2bin, BN_bin2bn, BN_bn2hex, BN_bn2dec, BN_hex2bn, BN_dec2bn,
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BN_print, BN_print_fp, BN_bn2mpi, BN_mpi2bn - format conversions"
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.IX Header "NAME"
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.IX Header "SYNOPSIS"
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.IX Header "DESCRIPTION"
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.IX Header "RETURN VALUES"
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.IX Header "SEE ALSO"
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.IX Header "HISTORY"
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