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ported ASN.1 changes to pkcs7

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This commit is contained in:
Andreas Steffen
2008-04-26 10:20:51 +00:00
parent f27e13e80f
commit df231f5488
2 changed files with 189 additions and 178 deletions
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src/libstrongswan/crypto/pkcs7.c
+183 -172
View File
@@ -14,7 +14,7 @@
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* $Id: pkcs7.c 3488 2008-02-21 15:10:02Z martin $
* $Id$
*/
#include <stdlib.h>
@@ -23,13 +23,15 @@
#include <library.h>
#include "debug.h"
#include <asn1/asn1.h>
#include <asn1/oid.h>
#include <crypto/x509.h>
#include <asn1/asn1.h>
#include <asn1/asn1_parser.h>
#include <credentials/certificates/x509.h>
#include <credentials/keys/public_key.h>
#include <crypto/pkcs9.h>
#include <crypto/hashers/hasher.h>
#include <crypto/crypters/crypter.h>
#include <crypto/rsa/rsa_public_key.h>
#include <utils/linked_list.h>
#include "pkcs7.h"
@@ -81,100 +83,6 @@ struct private_pkcs7_t {
linked_list_t *certs;
};
/**
* ASN.1 definition of the PKCS#7 ContentInfo type
*/
static const asn1Object_t contentInfoObjects[] = {
{ 0, "contentInfo", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */
{ 1, "contentType", ASN1_OID, ASN1_BODY }, /* 1 */
{ 1, "content", ASN1_CONTEXT_C_0, ASN1_OPT |
ASN1_BODY }, /* 2 */
{ 1, "end opt", ASN1_EOC, ASN1_END } /* 3 */
};
#define PKCS7_INFO_TYPE 1
#define PKCS7_INFO_CONTENT 2
#define PKCS7_INFO_ROOF 4
/**
* ASN.1 definition of the PKCS#7 signedData type
*/
static const asn1Object_t signedDataObjects[] = {
{ 0, "signedData", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */
{ 1, "version", ASN1_INTEGER, ASN1_BODY }, /* 1 */
{ 1, "digestAlgorithms", ASN1_SET, ASN1_LOOP }, /* 2 */
{ 2, "algorithm", ASN1_EOC, ASN1_RAW }, /* 3 */
{ 1, "end loop", ASN1_EOC, ASN1_END }, /* 4 */
{ 1, "contentInfo", ASN1_EOC, ASN1_RAW }, /* 5 */
{ 1, "certificates", ASN1_CONTEXT_C_0, ASN1_OPT |
ASN1_LOOP }, /* 6 */
{ 2, "certificate", ASN1_SEQUENCE, ASN1_OBJ }, /* 7 */
{ 1, "end opt or loop", ASN1_EOC, ASN1_END }, /* 8 */
{ 1, "crls", ASN1_CONTEXT_C_1, ASN1_OPT |
ASN1_LOOP }, /* 9 */
{ 2, "crl", ASN1_SEQUENCE, ASN1_OBJ }, /* 10 */
{ 1, "end opt or loop", ASN1_EOC, ASN1_END }, /* 11 */
{ 1, "signerInfos", ASN1_SET, ASN1_LOOP }, /* 12 */
{ 2, "signerInfo", ASN1_SEQUENCE, ASN1_NONE }, /* 13 */
{ 3, "version", ASN1_INTEGER, ASN1_BODY }, /* 14 */
{ 3, "issuerAndSerialNumber", ASN1_SEQUENCE, ASN1_BODY }, /* 15 */
{ 4, "issuer", ASN1_SEQUENCE, ASN1_OBJ }, /* 16 */
{ 4, "serial", ASN1_INTEGER, ASN1_BODY }, /* 17 */
{ 3, "digestAlgorithm", ASN1_EOC, ASN1_RAW }, /* 18 */
{ 3, "authenticatedAttributes", ASN1_CONTEXT_C_0, ASN1_OPT |
ASN1_OBJ }, /* 19 */
{ 3, "end opt", ASN1_EOC, ASN1_END }, /* 20 */
{ 3, "digestEncryptionAlgorithm", ASN1_EOC, ASN1_RAW }, /* 21 */
{ 3, "encryptedDigest", ASN1_OCTET_STRING, ASN1_BODY }, /* 22 */
{ 3, "unauthenticatedAttributes", ASN1_CONTEXT_C_1, ASN1_OPT }, /* 23 */
{ 3, "end opt", ASN1_EOC, ASN1_END }, /* 24 */
{ 1, "end loop", ASN1_EOC, ASN1_END } /* 25 */
};
#define PKCS7_DIGEST_ALG 3
#define PKCS7_SIGNED_CONTENT_INFO 5
#define PKCS7_SIGNED_CERT 7
#define PKCS7_SIGNER_INFO 13
#define PKCS7_SIGNED_ISSUER 16
#define PKCS7_SIGNED_SERIAL_NUMBER 17
#define PKCS7_DIGEST_ALGORITHM 18
#define PKCS7_AUTH_ATTRIBUTES 19
#define PKCS7_DIGEST_ENC_ALGORITHM 21
#define PKCS7_ENCRYPTED_DIGEST 22
#define PKCS7_SIGNED_ROOF 26
/**
* ASN.1 definition of the PKCS#7 envelopedData type
*/
static const asn1Object_t envelopedDataObjects[] = {
{ 0, "envelopedData", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */
{ 1, "version", ASN1_INTEGER, ASN1_BODY }, /* 1 */
{ 1, "recipientInfos", ASN1_SET, ASN1_LOOP }, /* 2 */
{ 2, "recipientInfo", ASN1_SEQUENCE, ASN1_BODY }, /* 3 */
{ 3, "version", ASN1_INTEGER, ASN1_BODY }, /* 4 */
{ 3, "issuerAndSerialNumber", ASN1_SEQUENCE, ASN1_BODY }, /* 5 */
{ 4, "issuer", ASN1_SEQUENCE, ASN1_OBJ }, /* 6 */
{ 4, "serial", ASN1_INTEGER, ASN1_BODY }, /* 7 */
{ 3, "encryptionAlgorithm", ASN1_EOC, ASN1_RAW }, /* 8 */
{ 3, "encryptedKey", ASN1_OCTET_STRING, ASN1_BODY }, /* 9 */
{ 1, "end loop", ASN1_EOC, ASN1_END }, /* 10 */
{ 1, "encryptedContentInfo", ASN1_SEQUENCE, ASN1_OBJ }, /* 11 */
{ 2, "contentType", ASN1_OID, ASN1_BODY }, /* 12 */
{ 2, "contentEncryptionAlgorithm", ASN1_EOC, ASN1_RAW }, /* 13 */
{ 2, "encryptedContent", ASN1_CONTEXT_S_0, ASN1_BODY } /* 14 */
};
#define PKCS7_ENVELOPED_VERSION 1
#define PKCS7_RECIPIENT_INFO_VERSION 4
#define PKCS7_ISSUER 6
#define PKCS7_SERIAL_NUMBER 7
#define PKCS7_ENCRYPTION_ALG 8
#define PKCS7_ENCRYPTED_KEY 9
#define PKCS7_CONTENT_TYPE 12
#define PKCS7_CONTENT_ENC_ALGORITHM 13
#define PKCS7_ENCRYPTED_CONTENT 14
#define PKCS7_ENVELOPED_ROOF 15
/**
* PKCS7 contentInfo OIDs
*/
@@ -299,7 +207,7 @@ static bool parse_data(private_pkcs7_t *this)
this->data = chunk_empty;
return TRUE;
}
if (parse_asn1_simple_object(&data, ASN1_OCTET_STRING, this->level, "data"))
if (asn1_parse_simple_object(&data, ASN1_OCTET_STRING, this->level, "data"))
{
this->data = chunk_clone(data);
return TRUE;
@@ -310,19 +218,64 @@ static bool parse_data(private_pkcs7_t *this)
}
}
/**
* ASN.1 definition of the PKCS#7 signedData type
*/
static const asn1Object_t signedDataObjects[] = {
{ 0, "signedData", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */
{ 1, "version", ASN1_INTEGER, ASN1_BODY }, /* 1 */
{ 1, "digestAlgorithms", ASN1_SET, ASN1_LOOP }, /* 2 */
{ 2, "algorithm", ASN1_EOC, ASN1_RAW }, /* 3 */
{ 1, "end loop", ASN1_EOC, ASN1_END }, /* 4 */
{ 1, "contentInfo", ASN1_EOC, ASN1_RAW }, /* 5 */
{ 1, "certificates", ASN1_CONTEXT_C_0, ASN1_OPT |
ASN1_LOOP }, /* 6 */
{ 2, "certificate", ASN1_SEQUENCE, ASN1_OBJ }, /* 7 */
{ 1, "end opt or loop", ASN1_EOC, ASN1_END }, /* 8 */
{ 1, "crls", ASN1_CONTEXT_C_1, ASN1_OPT |
ASN1_LOOP }, /* 9 */
{ 2, "crl", ASN1_SEQUENCE, ASN1_OBJ }, /* 10 */
{ 1, "end opt or loop", ASN1_EOC, ASN1_END }, /* 11 */
{ 1, "signerInfos", ASN1_SET, ASN1_LOOP }, /* 12 */
{ 2, "signerInfo", ASN1_SEQUENCE, ASN1_NONE }, /* 13 */
{ 3, "version", ASN1_INTEGER, ASN1_BODY }, /* 14 */
{ 3, "issuerAndSerialNumber", ASN1_SEQUENCE, ASN1_BODY }, /* 15 */
{ 4, "issuer", ASN1_SEQUENCE, ASN1_OBJ }, /* 16 */
{ 4, "serial", ASN1_INTEGER, ASN1_BODY }, /* 17 */
{ 3, "digestAlgorithm", ASN1_EOC, ASN1_RAW }, /* 18 */
{ 3, "authenticatedAttributes", ASN1_CONTEXT_C_0, ASN1_OPT |
ASN1_OBJ }, /* 19 */
{ 3, "end opt", ASN1_EOC, ASN1_END }, /* 20 */
{ 3, "digestEncryptionAlgorithm", ASN1_EOC, ASN1_RAW }, /* 21 */
{ 3, "encryptedDigest", ASN1_OCTET_STRING, ASN1_BODY }, /* 22 */
{ 3, "unauthenticatedAttributes", ASN1_CONTEXT_C_1, ASN1_OPT }, /* 23 */
{ 3, "end opt", ASN1_EOC, ASN1_END }, /* 24 */
{ 1, "end loop", ASN1_EOC, ASN1_END } /* 25 */
};
#define PKCS7_DIGEST_ALG 3
#define PKCS7_SIGNED_CONTENT_INFO 5
#define PKCS7_SIGNED_CERT 7
#define PKCS7_SIGNER_INFO 13
#define PKCS7_SIGNED_ISSUER 16
#define PKCS7_SIGNED_SERIAL_NUMBER 17
#define PKCS7_DIGEST_ALGORITHM 18
#define PKCS7_AUTH_ATTRIBUTES 19
#define PKCS7_DIGEST_ENC_ALGORITHM 21
#define PKCS7_ENCRYPTED_DIGEST 22
#define PKCS7_SIGNED_ROOF 26
/**
* Implements pkcs7_t.parse_signedData.
*/
static bool parse_signedData(private_pkcs7_t *this, x509_t *cacert)
{
asn1_ctx_t ctx;
asn1_parser_t *parser;
chunk_t object;
u_int level;
int objectID = 0;
int objectID;
int digest_alg = OID_UNKNOWN;
int enc_alg = OID_UNKNOWN;
int signerInfos = 0;
bool success = TRUE;
chunk_t encrypted_digest = chunk_empty;
@@ -331,62 +284,63 @@ static bool parse_signedData(private_pkcs7_t *this, x509_t *cacert)
return FALSE;
}
asn1_init(&ctx, this->content, this->level, FALSE, FALSE);
parser = asn1_parser_create(signedDataObjects, PKCS7_SIGNED_ROOF,
this->content);
parser->set_top_level(parser, this->level);
while (objectID < PKCS7_SIGNED_ROOF)
while (parser->iterate(parser, &objectID, &object))
{
if (!extract_object(signedDataObjects, &objectID, &object, &level, &ctx))
{
return FALSE;
}
u_int level = parser->get_level(parser);
switch (objectID)
{
case PKCS7_DIGEST_ALG:
digest_alg = parse_algorithmIdentifier(object, level, NULL);
digest_alg = asn1_parse_algorithmIdentifier(object, level, NULL);
break;
case PKCS7_SIGNED_CONTENT_INFO:
{
chunk_t pureData;
pkcs7_t *data = pkcs7_create_from_chunk(object, level+1);
{
chunk_t pureData;
pkcs7_t *data = pkcs7_create_from_chunk(object, level+1);
if (data == NULL)
{
return FALSE;
}
if (!data->parse_data(data))
{
data->destroy(data);
return FALSE;
}
pureData = data->get_data(data);
this->data = (pureData.len)? chunk_clone(pureData) : chunk_empty;
if (data == NULL)
{
success = FALSE;
goto end;
}
if (!data->parse_data(data))
{
data->destroy(data);
success = FALSE;
goto end;
}
pureData = data->get_data(data);
this->data = (pureData.len)? chunk_clone(pureData) : chunk_empty;
data->destroy(data);
break;
}
case PKCS7_SIGNED_CERT:
{
x509_t *cert = x509_create_from_chunk(chunk_clone(object), level+1);
{
x509_t *cert = x509_create_from_chunk(chunk_clone(object), level+1);
if (cert)
{
this->certs->insert_last(this->certs, (void*)cert);
}
if (cert)
{
this->certs->insert_last(this->certs, (void*)cert);
}
break;
}
case PKCS7_SIGNER_INFO:
signerInfos++;
DBG2(" signer #%d", signerInfos);
break;
case PKCS7_SIGNED_ISSUER:
{
identification_t *issuer;
{
identification_t *issuer;
issuer = identification_create_from_encoding(ID_DER_ASN1_DN, object);
DBG2(" '%D'", issuer);
issuer->destroy(issuer);
}
issuer = identification_create_from_encoding(ID_DER_ASN1_DN, object);
DBG2(" '%D'", issuer);
issuer->destroy(issuer);
break;
}
case PKCS7_AUTH_ATTRIBUTES:
*object.ptr = ASN1_SET;
this->attributes = pkcs9_create_from_chunk(object, level+1);
@@ -401,7 +355,14 @@ static bool parse_signedData(private_pkcs7_t *this, x509_t *cacert)
case PKCS7_ENCRYPTED_DIGEST:
encrypted_digest = object;
}
objectID++;
}
end:
success &= parser->success(parser);
parser->destroy(parser);
if (!success)
{
return FALSE;
}
/* check the signature only if a cacert is available */
@@ -485,16 +446,47 @@ static bool parse_signedData(private_pkcs7_t *this, x509_t *cacert)
return TRUE;
}
/**
* ASN.1 definition of the PKCS#7 envelopedData type
*/
static const asn1Object_t envelopedDataObjects[] = {
{ 0, "envelopedData", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */
{ 1, "version", ASN1_INTEGER, ASN1_BODY }, /* 1 */
{ 1, "recipientInfos", ASN1_SET, ASN1_LOOP }, /* 2 */
{ 2, "recipientInfo", ASN1_SEQUENCE, ASN1_BODY }, /* 3 */
{ 3, "version", ASN1_INTEGER, ASN1_BODY }, /* 4 */
{ 3, "issuerAndSerialNumber", ASN1_SEQUENCE, ASN1_BODY }, /* 5 */
{ 4, "issuer", ASN1_SEQUENCE, ASN1_OBJ }, /* 6 */
{ 4, "serial", ASN1_INTEGER, ASN1_BODY }, /* 7 */
{ 3, "encryptionAlgorithm", ASN1_EOC, ASN1_RAW }, /* 8 */
{ 3, "encryptedKey", ASN1_OCTET_STRING, ASN1_BODY }, /* 9 */
{ 1, "end loop", ASN1_EOC, ASN1_END }, /* 10 */
{ 1, "encryptedContentInfo", ASN1_SEQUENCE, ASN1_OBJ }, /* 11 */
{ 2, "contentType", ASN1_OID, ASN1_BODY }, /* 12 */
{ 2, "contentEncryptionAlgorithm", ASN1_EOC, ASN1_RAW }, /* 13 */
{ 2, "encryptedContent", ASN1_CONTEXT_S_0, ASN1_BODY } /* 14 */
};
#define PKCS7_ENVELOPED_VERSION 1
#define PKCS7_RECIPIENT_INFO_VERSION 4
#define PKCS7_ISSUER 6
#define PKCS7_SERIAL_NUMBER 7
#define PKCS7_ENCRYPTION_ALG 8
#define PKCS7_ENCRYPTED_KEY 9
#define PKCS7_CONTENT_TYPE 12
#define PKCS7_CONTENT_ENC_ALGORITHM 13
#define PKCS7_ENCRYPTED_CONTENT 14
#define PKCS7_ENVELOPED_ROOF 15
/**
* Parse PKCS#7 envelopedData content
*/
static bool parse_envelopedData(private_pkcs7_t *this, chunk_t serialNumber,
rsa_private_key_t *key)
{
asn1_ctx_t ctx;
asn1_parser_t *parser;
chunk_t object;
u_int level;
int objectID = 0;
int objectID;
bool success = FALSE;
chunk_t iv = chunk_empty;
chunk_t symmetric_key = chunk_empty;
@@ -507,29 +499,26 @@ static bool parse_envelopedData(private_pkcs7_t *this, chunk_t serialNumber,
return FALSE;
}
asn1_init(&ctx, this->content, this->level, FALSE, FALSE);
parser = asn1_parser_create(envelopedDataObjects, PKCS7_ENVELOPED_ROOF,
this->content);
parser->set_top_level(parser, this->level);
while (objectID < PKCS7_ENVELOPED_ROOF)
while (parser->iterate(parser, &objectID, &object))
{
if (!extract_object(envelopedDataObjects, &objectID, &object, &level, &ctx))
{
goto failed;
}
switch (objectID)
{
case PKCS7_ENVELOPED_VERSION:
if (*object.ptr != 0)
{
DBG1("envelopedData version is not 0");
goto failed;
goto end;
}
break;
case PKCS7_RECIPIENT_INFO_VERSION:
if (*object.ptr != 0)
{
DBG1("recipient info version is not 0");
goto failed;
goto end;
}
break;
case PKCS7_ISSUER:
@@ -545,7 +534,7 @@ static bool parse_envelopedData(private_pkcs7_t *this, chunk_t serialNumber,
if (!chunk_equals(serialNumber, object))
{
DBG1("serial numbers do not match");
goto failed;
goto end;
}
break;
case PKCS7_ENCRYPTION_ALG:
@@ -555,7 +544,7 @@ static bool parse_envelopedData(private_pkcs7_t *this, chunk_t serialNumber,
if (alg != OID_RSA_ENCRYPTION)
{
DBG1("only rsa encryption supported");
goto failed;
goto end;
}
}
break;
@@ -563,7 +552,7 @@ static bool parse_envelopedData(private_pkcs7_t *this, chunk_t serialNumber,
if (key->pkcs1_decrypt(key, object, &symmetric_key) != SUCCESS)
{
DBG1("symmetric key could not be decrypted with rsa");
goto failed;
goto end;
}
DBG4("symmetric key : %B", &symmetric_key);
break;
@@ -571,7 +560,7 @@ static bool parse_envelopedData(private_pkcs7_t *this, chunk_t serialNumber,
if (known_oid(object) != OID_PKCS7_DATA)
{
DBG1("encrypted content not of type pkcs7 data");
goto failed;
goto end;
}
break;
case PKCS7_CONTENT_ENC_ALGORITHM:
@@ -588,22 +577,22 @@ static bool parse_envelopedData(private_pkcs7_t *this, chunk_t serialNumber,
break;
default:
DBG1("Only DES and 3DES supported for symmetric encryption");
goto failed;
goto end;
}
if (symmetric_key.len != crypter->get_key_size(crypter))
{
DBG1("symmetric key has wrong length");
goto failed;
goto end;
}
if (!parse_asn1_simple_object(&iv, ASN1_OCTET_STRING, level+1, "IV"))
{
DBG1("IV could not be parsed");
goto failed;
goto end;
}
if (iv.len != crypter->get_block_size(crypter))
{
DBG1("IV has wrong length");
goto failed;
goto end;
}
}
break;
@@ -611,7 +600,15 @@ static bool parse_envelopedData(private_pkcs7_t *this, chunk_t serialNumber,
encrypted_content = object;
break;
}
objectID++;
}
success = TRUE;
end:
success &= parser->success(parser);
parser->destroy(parser);
if (!success)
{
goto failed;
}
/* decrypt the content */
@@ -887,7 +884,7 @@ bool build_signedData(private_pkcs7_t *this, rsa_private_key_t *private_key,
/* take the current time as signingTime */
time_t now = time(NULL);
chunk_t signingTime = timetoasn1(&now, ASN1_UTCTIME);
chunk_t signingTime = asn1_from_time(&now, ASN1_UTCTIME);
chunk_t messageDigest, attributes;
@@ -961,25 +958,35 @@ static void destroy(private_pkcs7_t *this)
free(this);
}
/**
* ASN.1 definition of the PKCS#7 ContentInfo type
*/
static const asn1Object_t contentInfoObjects[] = {
{ 0, "contentInfo", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */
{ 1, "contentType", ASN1_OID, ASN1_BODY }, /* 1 */
{ 1, "content", ASN1_CONTEXT_C_0, ASN1_OPT |
ASN1_BODY }, /* 2 */
{ 1, "end opt", ASN1_EOC, ASN1_END } /* 3 */
};
#define PKCS7_INFO_TYPE 1
#define PKCS7_INFO_CONTENT 2
#define PKCS7_INFO_ROOF 4
/**
* Parse PKCS#7 contentInfo object
*/
static bool parse_contentInfo(chunk_t blob, u_int level0, private_pkcs7_t *cInfo)
{
asn1_ctx_t ctx;
asn1_parser_t *parser;
chunk_t object;
u_int level;
int objectID = 0;
int objectID;
bool success = TRUE;
asn1_init(&ctx, blob, level0, FALSE, FALSE);
parser = asn1_parser_create(contentInfoObjects, PKCS7_INFO_TYPE, blob);
parser->set_top_level(parser, level0);
while (objectID < PKCS7_INFO_ROOF)
while (parser->iterate(parser, &objectID, &object))
{
if (!extract_object(contentInfoObjects, &objectID, &object, &level, &ctx))
{
return FALSE;
}
if (objectID == PKCS7_INFO_TYPE)
{
cInfo->type = known_oid(object);
@@ -987,16 +994,20 @@ static bool parse_contentInfo(chunk_t blob, u_int level0, private_pkcs7_t *cInfo
|| cInfo->type > OID_PKCS7_ENCRYPTED_DATA)
{
DBG1("unknown pkcs7 content type");
return FALSE;
success = FALSE;
goto end;
}
}
else if (objectID == PKCS7_INFO_CONTENT && object.len > 0)
{
cInfo->content = chunk_clone(object);
}
objectID++;
}
return TRUE;
end:
success &= parser->success(parser);
parser->destroy(parser);
return success;
}
/**
src/libstrongswan/crypto/pkcs7.h
+6 -6
View File
@@ -28,9 +28,9 @@
typedef struct pkcs7_t pkcs7_t;
#include <library.h>
#include <crypto/x509.h>
#include <credentials/certificates/x509.h>
#include <credentials/keys/private_key.h>
#include <crypto/pkcs9.h>
#include <crypto/rsa/rsa_private_key.h>
#include <crypto/crypters/crypter.h>
#include <utils/iterator.h>
@@ -78,10 +78,10 @@ struct pkcs7_t {
* Parse a PKCS#7 envelopedData content.
*
* @param serialNumber serialNumber of the request
* @param key RSA private key used to decrypt the symmetric key
* @param key private key used to decrypt the symmetric key
* @return TRUE if parsing was successful
*/
bool (*parse_envelopedData) (pkcs7_t *this, chunk_t serialNumber, rsa_private_key_t *key);
bool (*parse_envelopedData) (pkcs7_t *this, chunk_t serialNumber, private_key_t *key);
/**
* Returns the parsed data object
@@ -138,11 +138,11 @@ struct pkcs7_t {
/**
* Build an signedData object
*
* @param key signer's RSA private key
* @param key signer's private key
* @param alg digest algorithm used for signature
* @return TRUE if build was successful
*/
bool (*build_signedData) (pkcs7_t *this, rsa_private_key_t *key,
bool (*build_signedData) (pkcs7_t *this, private_key_t *key,
hash_algorithm_t alg);
/**