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90a1f2d76f
-Public PKCS7 methods that create a PKCS7 object now have variants that also add a libctx and propq. This includes PKCS7_new_with_libctx(), PKCS7_sign_with_libctx() and PKCS7_encrypt_with_libctx() -Added SMIME_read_PKCS7_ex() so that a created PKCS7 object can be passed to the read. -d2i_PKCS7_bio() has been modified so that after it loads the PKCS7 object it then resolves any subobjects that require the libctx/propq (such as objects containing X509 certificates). Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/11884)
132 lines
5.2 KiB
Plaintext
132 lines
5.2 KiB
Plaintext
=pod
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=head1 NAME
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PKCS7_sign_with_libctx, PKCS7_sign
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- create a PKCS#7 signedData structure
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=head1 SYNOPSIS
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#include <openssl/pkcs7.h>
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PKCS7 *PKCS7_sign_with_libctx(X509 *signcert, EVP_PKEY *pkey,
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STACK_OF(X509) *certs, BIO *data, int flags,
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OPENSSL_CTX *libctx, const char *propq);
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PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
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BIO *data, int flags);
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=head1 DESCRIPTION
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PKCS7_sign_with_libctx() creates and returns a PKCS#7 signedData structure.
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I<igncert> is the certificate to sign with, Ipkey> is the corresponding
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private key. I<certs> is an optional additional set of certificates to include
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in the PKCS#7 structure (for example any intermediate CAs in the chain). The
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library context I<libctx> and property query I<propq> are used when
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retrieving algorithms from providers.
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The data to be signed is read from BIO B<data>.
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B<flags> is an optional set of flags.
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Any of the following flags (ored together) can be passed in the B<flags>
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parameter.
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Many S/MIME clients expect the signed content to include valid MIME headers. If
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the B<PKCS7_TEXT> flag is set MIME headers for type B<text/plain> are prepended
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to the data.
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If B<PKCS7_NOCERTS> is set the signer's certificate will not be included in the
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PKCS7 structure, the signer's certificate must still be supplied in the
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B<signcert> parameter though. This can reduce the size of the signature if the
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signers certificate can be obtained by other means: for example a previously
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signed message.
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The data being signed is included in the PKCS7 structure, unless
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B<PKCS7_DETACHED> is set in which case it is omitted. This is used for PKCS7
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detached signatures which are used in S/MIME plaintext signed messages for
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example.
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Normally the supplied content is translated into MIME canonical format (as
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required by the S/MIME specifications) if B<PKCS7_BINARY> is set no translation
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occurs. This option should be used if the supplied data is in binary format
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otherwise the translation will corrupt it.
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The signedData structure includes several PKCS#7 authenticatedAttributes
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including the signing time, the PKCS#7 content type and the supported list of
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ciphers in an SMIMECapabilities attribute. If B<PKCS7_NOATTR> is set then no
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authenticatedAttributes will be used. If B<PKCS7_NOSMIMECAP> is set then just
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the SMIMECapabilities are omitted.
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If present the SMIMECapabilities attribute indicates support for the following
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algorithms: triple DES, 128 bit RC2, 64 bit RC2, DES and 40 bit RC2. If any of
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these algorithms is disabled then it will not be included.
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If the flags B<PKCS7_STREAM> is set then the returned B<PKCS7> structure is
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just initialized ready to perform the signing operation. The signing is however
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B<not> performed and the data to be signed is not read from the B<data>
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parameter. Signing is deferred until after the data has been written. In this
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way data can be signed in a single pass.
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If the B<PKCS7_PARTIAL> flag is set a partial B<PKCS7> structure is output to
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which additional signers and capabilities can be added before finalization.
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If the flag B<PKCS7_STREAM> is set the returned B<PKCS7> structure is B<not>
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complete and outputting its contents via a function that does not properly
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finalize the B<PKCS7> structure will give unpredictable results.
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Several functions including SMIME_write_PKCS7(), i2d_PKCS7_bio_stream(),
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PEM_write_bio_PKCS7_stream() finalize the structure. Alternatively finalization
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can be performed by obtaining the streaming ASN1 B<BIO> directly using
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BIO_new_PKCS7().
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If a signer is specified it will use the default digest for the signing
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algorithm. This is B<SHA1> for both RSA and DSA keys.
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The B<certs>, B<signcert> and B<pkey> parameters can all be
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B<NULL> if the B<PKCS7_PARTIAL> flag is set. One or more signers can be added
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using the function PKCS7_sign_add_signer(). PKCS7_final() must also be
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called to finalize the structure if streaming is not enabled. Alternative
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signing digests can also be specified using this method.
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If B<signcert> and B<pkey> are NULL then a certificates only
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PKCS#7 structure is output.
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In versions of OpenSSL before 1.0.0 the B<signcert> and B<pkey> parameters must
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B<NOT> be NULL.
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PKCS7_sign() is similar to PKCS7_sign_with_libctx() but uses default values of
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NULL for the library context I<libctx> and the property query I<propq>.
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=head1 BUGS
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Some advanced attributes such as counter signatures are not supported.
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=head1 RETURN VALUES
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PKCS7_sign_with_libctx() and PKCS7_sign() return either a valid PKCS7 structure
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or NULL if an error occurred. The error can be obtained from ERR_get_error(3).
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=head1 SEE ALSO
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L<ERR_get_error(3)>, L<PKCS7_verify(3)>
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=head1 HISTORY
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The function PKCS7_sign_with_libctx() was added in OpenSSL 3.0.
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The B<PKCS7_PARTIAL> flag, and the ability for B<certs>, B<signcert>,
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and B<pkey> parameters to be B<NULL> were added in OpenSSL 1.0.0.
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The B<PKCS7_STREAM> flag was added in OpenSSL 1.0.0.
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=head1 COPYRIGHT
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Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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