--- /dev/null
+/* crypto/cms/cms_enc.c */
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project.
+ */
+/* ====================================================================
+ * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ */
+
+#include "cryptlib.h"
+#include <openssl/asn1t.h>
+#include <openssl/pem.h>
+#include <openssl/x509v3.h>
+#include <openssl/err.h>
+#include <openssl/cms.h>
+#include <openssl/rand.h>
+#include "cms_lcl.h"
+
+/* CMS EncryptedData Utilities */
+
+DECLARE_ASN1_ITEM(CMS_EncryptedData)
+
+/* Return BIO based on EncryptedContentInfo and key */
+
+BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec)
+ {
+ BIO *b;
+ EVP_CIPHER_CTX *ctx;
+ const EVP_CIPHER *ciph;
+ X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
+ unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
+ unsigned char *tkey = NULL;
+ size_t tkeylen = 0;
+
+ int ok = 0;
+
+ int enc, keep_key = 0;
+
+ enc = ec->cipher ? 1 : 0;
+
+ b = BIO_new(BIO_f_cipher());
+ if (!b)
+ {
+ CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+ ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+
+ BIO_get_cipher_ctx(b, &ctx);
+
+ if (enc)
+ {
+ ciph = ec->cipher;
+ /* If not keeping key set cipher to NULL so subsequent calls
+ * decrypt.
+ */
+ if (ec->key)
+ ec->cipher = NULL;
+ }
+ else
+ {
+ ciph = EVP_get_cipherbyobj(calg->algorithm);
+
+ if (!ciph)
+ {
+ CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+ CMS_R_UNKNOWN_CIPHER);
+ goto err;
+ }
+ }
+
+ if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0)
+ {
+ CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+ CMS_R_CIPHER_INITIALISATION_ERROR);
+ goto err;
+ }
+
+ if (enc)
+ {
+ int ivlen;
+ calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
+ /* Generate a random IV if we need one */
+ ivlen = EVP_CIPHER_CTX_iv_length(ctx);
+ if (ivlen > 0)
+ {
+ if (RAND_pseudo_bytes(iv, ivlen) <= 0)
+ goto err;
+ piv = iv;
+ }
+ }
+ else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0)
+ {
+ CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+ CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
+ goto err;
+ }
+ tkeylen = EVP_CIPHER_CTX_key_length(ctx);
+ /* Generate random session key */
+ if (!enc || !ec->key)
+ {
+ tkey = OPENSSL_malloc(tkeylen);
+ if (!tkey)
+ {
+ CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+ ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
+ goto err;
+ }
+
+ if (!ec->key)
+ {
+ ec->key = tkey;
+ ec->keylen = tkeylen;
+ tkey = NULL;
+ if (enc)
+ keep_key = 1;
+ else
+ ERR_clear_error();
+
+ }
+
+ if (ec->keylen != tkeylen)
+ {
+ /* If necessary set key length */
+ if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0)
+ {
+ /* Only reveal failure if debugging so we don't
+ * leak information which may be useful in MMA.
+ */
+ if (enc || ec->debug)
+ {
+ CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+ CMS_R_INVALID_KEY_LENGTH);
+ goto err;
+ }
+ else
+ {
+ /* Use random key */
+ OPENSSL_cleanse(ec->key, ec->keylen);
+ OPENSSL_free(ec->key);
+ ec->key = tkey;
+ ec->keylen = tkeylen;
+ tkey = NULL;
+ ERR_clear_error();
+ }
+ }
+ }
+
+ if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0)
+ {
+ CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+ CMS_R_CIPHER_INITIALISATION_ERROR);
+ goto err;
+ }
+
+ if (piv)
+ {
+ calg->parameter = ASN1_TYPE_new();
+ if (!calg->parameter)
+ {
+ CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+ ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0)
+ {
+ CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+ CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
+ goto err;
+ }
+ }
+ ok = 1;
+
+ err:
+ if (ec->key && !keep_key)
+ {
+ OPENSSL_cleanse(ec->key, ec->keylen);
+ OPENSSL_free(ec->key);
+ ec->key = NULL;
+ }
+ if (tkey)
+ {
+ OPENSSL_cleanse(tkey, tkeylen);
+ OPENSSL_free(tkey);
+ }
+ if (ok)
+ return b;
+ BIO_free(b);
+ return NULL;
+ }
+
+int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
+ const EVP_CIPHER *cipher,
+ const unsigned char *key, size_t keylen)
+ {
+ ec->cipher = cipher;
+ if (key)
+ {
+ ec->key = OPENSSL_malloc(keylen);
+ if (!ec->key)
+ return 0;
+ memcpy(ec->key, key, keylen);
+ }
+ ec->keylen = keylen;
+ if (cipher)
+ ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
+ return 1;
+ }
+
+int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
+ const unsigned char *key, size_t keylen)
+ {
+ CMS_EncryptedContentInfo *ec;
+ if (!key || !keylen)
+ {
+ CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY);
+ return 0;
+ }
+ if (ciph)
+ {
+ cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
+ if (!cms->d.encryptedData)
+ {
+ CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
+ ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
+ cms->d.encryptedData->version = 0;
+ }
+ else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted)
+ {
+ CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
+ CMS_R_NOT_ENCRYPTED_DATA);
+ return 0;
+ }
+ ec = cms->d.encryptedData->encryptedContentInfo;
+ return cms_EncryptedContent_init(ec, ciph, key, keylen);
+ }
+
+BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms)
+ {
+ CMS_EncryptedData *enc = cms->d.encryptedData;
+ if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
+ enc->version = 2;
+ return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);
+ }
projects / cassiopeia.git / blobdiff