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Diffstat (limited to 'secure/lib/libcrypto/man/PKCS7_verify.3')
-rw-r--r-- | secure/lib/libcrypto/man/PKCS7_verify.3 | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/PKCS7_verify.3 b/secure/lib/libcrypto/man/PKCS7_verify.3 new file mode 100644 index 0000000..9727ab8 --- /dev/null +++ b/secure/lib/libcrypto/man/PKCS7_verify.3 @@ -0,0 +1,235 @@ +.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.14 +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sh \" Subsection heading +.br +.if t .Sp +.ne 5 +.PP +\fB\\$1\fR +.PP +.. +.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. | 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<>. +.tr \(*W-|\(bv\*(Tr +.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" '' +'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 \nF \{\ +. de IX +. tm Index:\\$1\t\\n%\t"\\$2" +.. +. nr % 0 +. rr F +.\} +.\" +.\" 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. +. \" 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 "PKCS7_verify 3" +.TH PKCS7_verify 3 "2005-02-24" "0.9.7d" "OpenSSL" +.SH "NAME" +PKCS7_verify \- verify a PKCS#7 signedData structure +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +int PKCS7_verify(\s-1PKCS7\s0 *p7, \s-1STACK_OF\s0(X509) *certs, X509_STORE *store, \s-1BIO\s0 *indata, \s-1BIO\s0 *out, int flags); +.PP +int PKCS7_get0_signers(\s-1PKCS7\s0 *p7, \s-1STACK_OF\s0(X509) *certs, int flags); +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +\&\fIPKCS7_verify()\fR verifies a PKCS#7 signedData structure. \fBp7\fR is the \s-1PKCS7\s0 +structure to verify. \fBcerts\fR is a set of certificates in which to search for +the signer's certificate. \fBstore\fR is a trusted certficate store (used for +chain verification). \fBindata\fR is the signed data if the content is not +present in \fBp7\fR (that is it is detached). The content is written to \fBout\fR +if it is not \s-1NULL\s0. +.PP +\&\fBflags\fR is an optional set of flags, which can be used to modify the verify +operation. +.PP +\&\fIPKCS7_get0_signers()\fR retrieves the signer's certificates from \fBp7\fR, it does +\&\fBnot\fR check their validity or whether any signatures are valid. The \fBcerts\fR +and \fBflags\fR parameters have the same meanings as in \fIPKCS7_verify()\fR. +.SH "VERIFY PROCESS" +.IX Header "VERIFY PROCESS" +Normally the verify process proceeds as follows. +.PP +Initially some sanity checks are performed on \fBp7\fR. The type of \fBp7\fR must +be signedData. There must be at least one signature on the data and if +the content is detached \fBindata\fR cannot be \fB\s-1NULL\s0\fR. +.PP +An attempt is made to locate all the signer's certificates, first looking in +the \fBcerts\fR parameter (if it is not \fB\s-1NULL\s0\fR) and then looking in any certificates +contained in the \fBp7\fR structure itself. If any signer's certificates cannot be +located the operation fails. +.PP +Each signer's certificate is chain verified using the \fBsmimesign\fR purpose and +the supplied trusted certificate store. Any internal certificates in the message +are used as untrusted CAs. If any chain verify fails an error code is returned. +.PP +Finally the signed content is read (and written to \fBout\fR is it is not \s-1NULL\s0) and +the signature's checked. +.PP +If all signature's verify correctly then the function is successful. +.PP +Any of the following flags (ored together) can be passed in the \fBflags\fR parameter +to change the default verify behaviour. Only the flag \fB\s-1PKCS7_NOINTERN\s0\fR is +meaningful to \fIPKCS7_get0_signers()\fR. +.PP +If \fB\s-1PKCS7_NOINTERN\s0\fR is set the certificates in the message itself are not +searched when locating the signer's certificate. This means that all the signers +certificates must be in the \fBcerts\fR parameter. +.PP +If the \fB\s-1PKCS7_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR are deleted +from the content. If the content is not of type \fBtext/plain\fR then an error is +returned. +.PP +If \fB\s-1PKCS7_NOVERIFY\s0\fR is set the signer's certificates are not chain verified. +.PP +If \fB\s-1PKCS7_NOCHAIN\s0\fR is set then the certificates contained in the message are +not used as untrusted CAs. This means that the whole verify chain (apart from +the signer's certificate) must be contained in the trusted store. +.PP +If \fB\s-1PKCS7_NOSIGS\s0\fR is set then the signatures on the data are not checked. +.SH "NOTES" +.IX Header "NOTES" +One application of \fB\s-1PKCS7_NOINTERN\s0\fR is to only accept messages signed by +a small number of certificates. The acceptable certificates would be passed +in the \fBcerts\fR parameter. In this case if the signer is not one of the +certificates supplied in \fBcerts\fR then the verify will fail because the +signer cannot be found. +.PP +Care should be taken when modifying the default verify behaviour, for example +setting \fBPKCS7_NOVERIFY|PKCS7_NOSIGS\fR will totally disable all verification +and any signed message will be considered valid. This combination is however +useful if one merely wishes to write the content to \fBout\fR and its validity +is not considered important. +.PP +Chain verification should arguably be performed using the signing time rather +than the current time. However since the signing time is supplied by the +signer it cannot be trusted without additional evidence (such as a trusted +timestamp). +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fIPKCS7_verify()\fR returns 1 for a successful verification and zero or a negative +value if an error occurs. +.PP +\&\fIPKCS7_get0_signers()\fR returns all signers or \fB\s-1NULL\s0\fR if an error occurred. +.PP +The error can be obtained from \fIERR_get_error\fR\|(3) +.SH "BUGS" +.IX Header "BUGS" +The trusted certificate store is not searched for the signers certificate, +this is primarily due to the inadequacies of the current \fBX509_STORE\fR +functionality. +.PP +The lack of single pass processing and need to hold all data in memory as +mentioned in \fIPKCS7_sign()\fR also applies to \fIPKCS7_verify()\fR. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fIERR_get_error\fR\|(3), \fIPKCS7_sign\fR\|(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\fIPKCS7_verify()\fR was added to OpenSSL 0.9.5 |