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author | nectar <nectar@FreeBSD.org> | 2005-02-25 06:04:12 +0000 |
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committer | nectar <nectar@FreeBSD.org> | 2005-02-25 06:04:12 +0000 |
commit | deac0ae54c501cec8549d18e9482a730cc2d4b97 (patch) | |
tree | cc99086df80af0d12671c7151a7b49233e19f39d /secure/lib/libcrypto/man/BN_num_bytes.3 | |
parent | ced877b043d77d97f1ad196f15b25ed720c1fcdc (diff) | |
download | FreeBSD-src-deac0ae54c501cec8549d18e9482a730cc2d4b97.zip FreeBSD-src-deac0ae54c501cec8549d18e9482a730cc2d4b97.tar.gz |
Update OpenSSL 0.9.7d -> 0.9.7e.
Diffstat (limited to 'secure/lib/libcrypto/man/BN_num_bytes.3')
-rw-r--r-- | secure/lib/libcrypto/man/BN_num_bytes.3 | 66 |
1 files changed, 39 insertions, 27 deletions
diff --git a/secure/lib/libcrypto/man/BN_num_bytes.3 b/secure/lib/libcrypto/man/BN_num_bytes.3 index 674a5e0..6fe4ec8 100644 --- a/secure/lib/libcrypto/man/BN_num_bytes.3 +++ b/secure/lib/libcrypto/man/BN_num_bytes.3 @@ -1,8 +1,7 @@ -.\" Automatically generated by Pod::Man version 1.15 -.\" Wed Mar 17 09:38:31 2004 +.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.14 .\" .\" Standard preamble: -.\" ====================================================================== +.\" ======================================================================== .de Sh \" Subsection heading .br .if t .Sp @@ -15,12 +14,6 @@ .if t .sp .5v .if n .sp .. -.de Ip \" List item -.br -.ie \\n(.$>=3 .ne \\$3 -.el .ne 3 -.IP "\\$1" \\$2 -.. .de Vb \" Begin verbatim text .ft CW .nf @@ -28,15 +21,14 @@ .. .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. | will give a -.\" real vertical bar. \*(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<> +.\" real vertical bar. \*(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-|\(bv\*(Tr .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ @@ -56,10 +48,10 @@ . ds R" '' 'br\} .\" -.\" If the F register is turned on, we'll generate index entries on stderr -.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and -.\" index entries marked with X<> in POD. Of course, you'll have to process -.\" the output yourself in some meaningful fashion. +.\" If the F register is turned on, we'll generate index entries on stderr for +.\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index +.\" entries marked with X<> in POD. Of course, you'll have to process the +.\" output yourself in some meaningful fashion. .if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" @@ -68,14 +60,13 @@ . rr F .\} .\" -.\" For nroff, turn off justification. Always turn off hyphenation; it -.\" makes way too many mistakes in technical documents. +.\" For nroff, turn off justification. Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. .hy 0 .if n .na .\" .\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). .\" Fear. Run. Save yourself. No user-serviceable parts. -.bd B 3 . \" fudge factors for nroff and troff .if n \{\ . ds #H 0 @@ -135,39 +126,60 @@ . ds Ae AE .\} .rm #[ #] #H #V #F C -.\" ====================================================================== +.\" ======================================================================== .\" .IX Title "BN_num_bytes 3" -.TH BN_num_bytes 3 "0.9.7d" "2004-03-17" "OpenSSL" -.UC +.TH BN_num_bytes 3 "2005-02-24" "0.9.7d" "OpenSSL" .SH "NAME" -BN_num_bits, BN_num_bytes, BN_num_bits_word \- get \s-1BIGNUM\s0 size +BN_num_bits, BN_num_bytes, BN_num_bits_word \- get BIGNUM size .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bn.h> .Ve +.PP .Vb 1 \& int BN_num_bytes(const BIGNUM *a); .Ve +.PP .Vb 1 \& int BN_num_bits(const BIGNUM *a); .Ve +.PP .Vb 1 \& int BN_num_bits_word(BN_ULONG w); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" -These functions return the size of a \fB\s-1BIGNUM\s0\fR in bytes or bits, -and the size of an unsigned integer in bits. +\&\fIBN_num_bytes()\fR returns the size of a \fB\s-1BIGNUM\s0\fR in bytes. +.PP +\&\fIBN_num_bits_word()\fR returns the number of significant bits in a word. +If we take 0x00000432 as an example, it returns 11, not 16, not 32. +Basically, except for a zero, it returns \fIfloor(log2(w))+1\fR. +.PP +\&\fIBN_num_bits()\fR returns the number of significant bits in a \fB\s-1BIGNUM\s0\fR, +following the same principle as \fIBN_num_bits_word()\fR. .PP \&\fIBN_num_bytes()\fR is a macro. .SH "RETURN VALUES" .IX Header "RETURN VALUES" The size. +.SH "NOTES" +.IX Header "NOTES" +Some have tried using \fIBN_num_bits()\fR on individual numbers in \s-1RSA\s0 keys, +\&\s-1DH\s0 keys and \s-1DSA\s0 keys, and found that they don't always come up with +the number of bits they expected (something like 512, 1024, 2048, +\&...). This is because generating a number with some specific number +of bits doesn't always set the highest bits, thereby making the number +of \fIsignificant\fR bits a little lower. If you want to know the \*(L"key +size\*(R" of such a key, either use functions like \fIRSA_size()\fR, \fIDH_size()\fR +and \fIDSA_size()\fR, or use \fIBN_num_bytes()\fR and multiply with 8 (although +there's no real guarantee that will match the \*(L"key size\*(R", just a lot +more probability). .SH "SEE ALSO" .IX Header "SEE ALSO" -bn(3) +\&\fIbn\fR\|(3), \fIDH_size\fR\|(3), \fIDSA_size\fR\|(3), +\&\fIRSA_size\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fIBN_num_bytes()\fR, \fIBN_num_bits()\fR and \fIBN_num_bits_word()\fR are available in |