1 .\" Automatically generated by Pod::Man 4.07 (Pod::Simple 3.35)
4 .\" ========================================================================
5 .de Sp \" Vertical space (when we can't use .PP)
9 .de Vb \" Begin verbatim text
14 .de Ve \" End verbatim text
18 .\" Set up some character translations and predefined strings. \*(-- will
19 .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
20 .\" double quote, and \*(R" will give a right double quote. \*(C+ will
21 .\" give a nicer C++. Capital omega is used to do unbreakable dashes and
22 .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
23 .\" nothing in troff, for use with C<>.
25 .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
29 . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
30 . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
45 .\" Escape single quotes in literal strings from groff's Unicode transform.
49 .\" If the F register is >0, we'll generate index entries on stderr for
50 .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
51 .\" entries marked with X<> in POD. Of course, you'll have to process the
52 .\" output yourself in some meaningful fashion.
54 .\" Avoid warning from groff about undefined register 'F'.
60 . tm Index:\\$1\t\\n%\t"\\$2"
68 .\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
69 .\" Fear. Run. Save yourself. No user-serviceable parts.
70 . \" fudge factors for nroff and troff
79 . ds #H ((1u-(\\\\n(.fu%2u))*.13m)
85 . \" simple accents for nroff and troff
95 . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
96 . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
97 . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
98 . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
99 . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
100 . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
102 . \" troff and (daisy-wheel) nroff accents
103 .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
104 .ds 8 \h'\*(#H'\(*b\h'-\*(#H'
105 .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
106 .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
107 .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
108 .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
109 .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
110 .ds ae a\h'-(\w'a'u*4/10)'e
111 .ds Ae A\h'-(\w'A'u*4/10)'E
112 . \" corrections for vroff
113 .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
114 .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
115 . \" for low resolution devices (crt and lpr)
116 .if \n(.H>23 .if \n(.V>19 \
129 .\" ========================================================================
131 .IX Title "RSA_check_key 3"
132 .TH RSA_check_key 3 "2017-12-07" "1.0.2n" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
134 .\" way too many mistakes in technical documents.
138 RSA_check_key \- validate private RSA keys
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/rsa.h>
144 \& int RSA_check_key(RSA *rsa);
147 .IX Header "DESCRIPTION"
148 This function validates \s-1RSA\s0 keys. It checks that \fBp\fR and \fBq\fR are
149 in fact prime, and that \fBn = p*q\fR.
151 It also checks that \fBd*e = 1 mod (p\-1*q\-1)\fR,
152 and that \fBdmp1\fR, \fBdmq1\fR and \fBiqmp\fR are set correctly or are \fB\s-1NULL\s0\fR.
154 As such, this function can not be used with any arbitrary \s-1RSA\s0 key object,
155 even if it is otherwise fit for regular \s-1RSA\s0 operation. See \fB\s-1NOTES\s0\fR for more
158 .IX Header "RETURN VALUE"
159 \&\fIRSA_check_key()\fR returns 1 if \fBrsa\fR is a valid \s-1RSA\s0 key, and 0 otherwise.
160 \&\-1 is returned if an error occurs while checking the key.
162 If the key is invalid or an error occurred, the reason code can be
163 obtained using \fIERR_get_error\fR\|(3).
166 This function does not work on \s-1RSA\s0 public keys that have only the modulus
167 and public exponent elements populated. It performs integrity checks on all
168 the \s-1RSA\s0 key material, so the \s-1RSA\s0 key structure must contain all the private
171 Unlike most other \s-1RSA\s0 functions, this function does \fBnot\fR work
172 transparently with any underlying \s-1ENGINE\s0 implementation because it uses the
173 key data in the \s-1RSA\s0 structure directly. An \s-1ENGINE\s0 implementation can
174 override the way key data is stored and handled, and can even provide
175 support for \s-1HSM\s0 keys \- in which case the \s-1RSA\s0 structure may contain \fBno\fR
176 key data at all! If the \s-1ENGINE\s0 in question is only being used for
177 acceleration or analysis purposes, then in all likelihood the \s-1RSA\s0 key data
178 is complete and untouched, but this can't be assumed in the general case.
181 A method of verifying the \s-1RSA\s0 key using opaque \s-1RSA API\s0 functions might need
182 to be considered. Right now \fIRSA_check_key()\fR simply uses the \s-1RSA\s0 structure
183 elements directly, bypassing the \s-1RSA_METHOD\s0 table altogether (and
184 completely violating encapsulation and object-orientation in the process).
185 The best fix will probably be to introduce a \*(L"\fIcheck_key()\fR\*(R" handler to the
186 \&\s-1RSA_METHOD\s0 function table so that alternative implementations can also
187 provide their own verifiers.
189 .IX Header "SEE ALSO"
190 \&\fIrsa\fR\|(3), \fIERR_get_error\fR\|(3)
193 \&\fIRSA_check_key()\fR appeared in OpenSSL 0.9.4.