diff options
Diffstat (limited to 'crypto/cms/cms_enc.c')
| -rw-r--r-- | crypto/cms/cms_enc.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/crypto/cms/cms_enc.c b/crypto/cms/cms_enc.c new file mode 100644 index 0000000000..084bc12466 --- /dev/null +++ b/crypto/cms/cms_enc.c @@ -0,0 +1,196 @@ +/* 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" +#include "asn1_locl.h" + +/* CMS EncryptedData Utilities */ + +/* Set up EncryptedContentInfo based on supplied cipher bio */ + +int cms_bio_to_EncryptedContent(CMS_EncryptedContentInfo *ec, + const unsigned char *key, int keylen, + BIO *b) + { + EVP_CIPHER_CTX *ctx = NULL; + unsigned char iv[EVP_MAX_IV_LENGTH], *piv; + int ivlen; + + BIO_get_cipher_ctx(b, &ctx); + + /* If necessary set key length */ + + if (keylen != EVP_CIPHER_CTX_key_length(ctx)) + { + if (EVP_CIPHER_CTX_set_key_length(ctx, keylen) <= 0) + { + CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT, + CMS_R_INVALID_KEY_LENGTH); + return 0; + } + } + + /* 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) + return 0; + piv = iv; + } + else + piv = NULL; + + if (EVP_CipherInit_ex(ctx, NULL, NULL, key, piv, 1) <= 0) + { + CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT, + CMS_R_CIPHER_INITIALISATION_ERROR); + return 0; + } + + ec->contentEncryptionAlgorithm->algorithm = + OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx)); + + if (piv) + { + ec->contentEncryptionAlgorithm->parameter = ASN1_TYPE_new(); + if (!ec->contentEncryptionAlgorithm->parameter) + { + CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT, + ERR_R_MALLOC_FAILURE); + return 0; + } + if (EVP_CIPHER_param_to_asn1(ctx, + ec->contentEncryptionAlgorithm->parameter) <= 0) + { + CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT, + CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); + return 0; + } + } + + return 1; + } + +/* Return BIO based on EncryptedContentInfo and key */ + +BIO *cms_EncryptedContent_to_bio(CMS_EncryptedContentInfo *ec, + const unsigned char *key, int keylen) + { + BIO *b; + EVP_CIPHER_CTX *ctx; + const EVP_CIPHER *ciph; + b = BIO_new(BIO_f_cipher()); + if (!b) + { + CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO, ERR_R_MALLOC_FAILURE); + return NULL; + } + BIO_get_cipher_ctx(b, &ctx); + + ciph = EVP_get_cipherbyobj(ec->contentEncryptionAlgorithm->algorithm); + + if (!ciph) + { + CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO, CMS_R_UNKNOWN_CIPHER); + goto err; + } + + if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, 0) <= 0) + { + CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO, + CMS_R_CIPHER_INITIALISATION_ERROR); + goto err; + } + + /* If necessary set key length */ + + if (keylen != EVP_CIPHER_CTX_key_length(ctx)) + { + if (EVP_CIPHER_CTX_set_key_length(ctx, keylen) <= 0) + { + CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO, + CMS_R_INVALID_KEY_LENGTH); + goto err; + } + } + + if (EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, 0) <= 0) + { + CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO, + CMS_R_CIPHER_INITIALISATION_ERROR); + goto err; + } + + if (EVP_CIPHER_asn1_to_param(ctx, + ec->contentEncryptionAlgorithm->parameter) <= 0) + { + CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO, + CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); + goto err; + } + return b; + + err: + BIO_free(b); + return NULL; + } + |