1 .\" $NetBSD: RSA_check_key.3,v 1.14 2015/06/12 17:01:14 christos Exp $
3 .\" Automatically generated by Pod::Man 2.28 (Pod::Simple 3.28)
6 .\" ========================================================================
7 .de Sp \" Vertical space (when we can't use .PP)
11 .de Vb \" Begin verbatim text
16 .de Ve \" End verbatim text
20 .\" Set up some character translations and predefined strings. \*(-- will
21 .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
22 .\" double quote, and \*(R" will give a right double quote. \*(C+ will
23 .\" give a nicer C++. Capital omega is used to do unbreakable dashes and
24 .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
25 .\" nothing in troff, for use with C<>.
27 .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
31 . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
32 . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
47 .\" Escape single quotes in literal strings from groff's Unicode transform.
51 .\" If the F register is turned on, we'll generate index entries on stderr for
52 .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
53 .\" entries marked with X<> in POD. Of course, you'll have to process the
54 .\" output yourself in some meaningful fashion.
56 .\" Avoid warning from groff about undefined register 'F'.
60 .if \n(.g .if rF .nr rF 1
61 .if (\n(rF:(\n(.g==0)) \{
64 . tm Index:\\$1\t\\n%\t"\\$2"
74 .\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
75 .\" Fear. Run. Save yourself. No user-serviceable parts.
76 . \" fudge factors for nroff and troff
85 . ds #H ((1u-(\\\\n(.fu%2u))*.13m)
91 . \" simple accents for nroff and troff
101 . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
102 . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
103 . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
104 . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
105 . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
106 . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
108 . \" troff and (daisy-wheel) nroff accents
109 .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
110 .ds 8 \h'\*(#H'\(*b\h'-\*(#H'
111 .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
112 .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
113 .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
114 .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
115 .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
116 .ds ae a\h'-(\w'a'u*4/10)'e
117 .ds Ae A\h'-(\w'A'u*4/10)'E
118 . \" corrections for vroff
119 .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
120 .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
121 . \" for low resolution devices (crt and lpr)
122 .if \n(.H>23 .if \n(.V>19 \
135 .\" ========================================================================
137 .IX Title "RSA_check_key 3"
138 .TH RSA_check_key 3 "2009-07-19" "1.0.1n" "OpenSSL"
139 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
140 .\" way too many mistakes in technical documents.
144 RSA_check_key \- validate private RSA keys
148 .IX Header "SYNOPSIS"
150 \& #include <openssl/rsa.h>
152 \& int RSA_check_key(RSA *rsa);
155 .IX Header "DESCRIPTION"
156 This function validates \s-1RSA\s0 keys. It checks that \fBp\fR and \fBq\fR are
157 in fact prime, and that \fBn = p*q\fR.
159 It also checks that \fBd*e = 1 mod (p\-1*q\-1)\fR,
160 and that \fBdmp1\fR, \fBdmq1\fR and \fBiqmp\fR are set correctly or are \fB\s-1NULL\s0\fR.
162 As such, this function can not be used with any arbitrary \s-1RSA\s0 key object,
163 even if it is otherwise fit for regular \s-1RSA\s0 operation. See \fB\s-1NOTES\s0\fR for more
166 .IX Header "RETURN VALUE"
167 \&\fIRSA_check_key()\fR returns 1 if \fBrsa\fR is a valid \s-1RSA\s0 key, and 0 otherwise.
168 \&\-1 is returned if an error occurs while checking the key.
170 If the key is invalid or an error occurred, the reason code can be
171 obtained using \fIERR_get_error\fR\|(3).
174 This function does not work on \s-1RSA\s0 public keys that have only the modulus
175 and public exponent elements populated. It performs integrity checks on all
176 the \s-1RSA\s0 key material, so the \s-1RSA\s0 key structure must contain all the private
179 Unlike most other \s-1RSA\s0 functions, this function does \fBnot\fR work
180 transparently with any underlying \s-1ENGINE\s0 implementation because it uses the
181 key data in the \s-1RSA\s0 structure directly. An \s-1ENGINE\s0 implementation can
182 override the way key data is stored and handled, and can even provide
183 support for \s-1HSM\s0 keys \- in which case the \s-1RSA\s0 structure may contain \fBno\fR
184 key data at all! If the \s-1ENGINE\s0 in question is only being used for
185 acceleration or analysis purposes, then in all likelihood the \s-1RSA\s0 key data
186 is complete and untouched, but this can't be assumed in the general case.
189 A method of verifying the \s-1RSA\s0 key using opaque \s-1RSA API\s0 functions might need
190 to be considered. Right now \fIRSA_check_key()\fR simply uses the \s-1RSA\s0 structure
191 elements directly, bypassing the \s-1RSA_METHOD\s0 table altogether (and
192 completely violating encapsulation and object-orientation in the process).
193 The best fix will probably be to introduce a \*(L"\fIcheck_key()\fR\*(R" handler to the
194 \&\s-1RSA_METHOD\s0 function table so that alternative implementations can also
195 provide their own verifiers.
197 .IX Header "SEE ALSO"
198 \&\fIopenssl_rsa\fR\|(3), \fIERR_get_error\fR\|(3)
201 \&\fIRSA_check_key()\fR appeared in OpenSSL 0.9.4.