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$NetBSD: PKCS7_sign_add_signer.3,v 1.1.1.2 2023/04/18 14:19:14 christos Exp $

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Title "PKCS7_sign_add_signer 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
.nh PKCS7_sign_add_signer - add a signer PKCS7 signed data structure libcrypto, -lcrypto Header "SYNOPSIS" .Vb 1 #include <openssl/pkcs7.h> \& PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert, EVP_PKEY *pkey, const EVP_MD *md, int flags); .Ve Header "DESCRIPTION" \fBPKCS7_sign_add_signer() adds a signer with certificate signcert and private key pkey using message digest md to a \s-1PKCS7\s0 signed data structure \fBp7.

The \s-1PKCS7\s0 structure should be obtained from an initial call to PKCS7_sign() with the flag \s-1PKCS7_PARTIAL\s0 set or in the case or re-signing a valid \s-1PKCS7\s0 signed data structure.

If the md parameter is \s-1NULL\s0 then the default digest for the public key algorithm will be used.

Unless the \s-1PKCS7_REUSE_DIGEST\s0 flag is set the returned \s-1PKCS7\s0 structure is not complete and must be finalized either by streaming (if applicable) or a call to PKCS7_final().

Header "NOTES" The main purpose of this function is to provide finer control over a PKCS#7 signed data structure where the simpler PKCS7_sign() function defaults are not appropriate. For example if multiple signers or non default digest algorithms are needed.

Any of the following flags (ored together) can be passed in the flags parameter.

If \s-1PKCS7_REUSE_DIGEST\s0 is set then an attempt is made to copy the content digest value from the \s-1PKCS7\s0 structure: to add a signer to an existing structure. An error occurs if a matching digest value cannot be found to copy. The returned \s-1PKCS7\s0 structure will be valid and finalized when this flag is set.

If \s-1PKCS7_PARTIAL\s0 is set in addition to \s-1PKCS7_REUSE_DIGEST\s0 then the \fB\s-1PKCS7_SIGNER_INO\s0 structure will not be finalized so additional attributes can be added. In this case an explicit call to PKCS7_SIGNER_INFO_sign() is needed to finalize it.

If \s-1PKCS7_NOCERTS\s0 is set the signer's certificate will not be included in the \s-1PKCS7\s0 structure, the signer's certificate must still be supplied in the \fBsigncert parameter though. This can reduce the size of the signature if the signers certificate can be obtained by other means: for example a previously signed message.

The signedData structure includes several PKCS#7 authenticatedAttributes including the signing time, the PKCS#7 content type and the supported list of ciphers in an SMIMECapabilities attribute. If \s-1PKCS7_NOATTR\s0 is set then no authenticatedAttributes will be used. If \s-1PKCS7_NOSMIMECAP\s0 is set then just the SMIMECapabilities are omitted.

If present the SMIMECapabilities attribute indicates support for the following algorithms: triple \s-1DES, 128\s0 bit \s-1RC2, 64\s0 bit \s-1RC2, DES\s0 and 40 bit \s-1RC2.\s0 If any of these algorithms is disabled then it will not be included.

\fBPKCS7_sign_add_signers() returns an internal pointer to the \s-1PKCS7_SIGNER_INFO\s0 structure just added, this can be used to set additional attributes before it is finalized.

Header "RETURN VALUES" \fBPKCS7_sign_add_signers() returns an internal pointer to the \s-1PKCS7_SIGNER_INFO\s0 structure just added or \s-1NULL\s0 if an error occurs. Header "SEE ALSO" \fBERR_get_error\|(3), PKCS7_sign\|(3), \fBPKCS7_final\|(3), Header "HISTORY" The PPKCS7_sign_add_signer() function was added in OpenSSL 1.0.0. Header "COPYRIGHT" Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.

Indexes created Wed Apr 22 00:22:44 UTC 2026