diff options
Diffstat (limited to 'crypto/cms/cms_enc.c')
| -rw-r--r-- | crypto/cms/cms_enc.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/crypto/cms/cms_enc.c b/crypto/cms/cms_enc.c new file mode 100644 index 0000000000..bab26235bd --- /dev/null +++ b/crypto/cms/cms_enc.c @@ -0,0 +1,262 @@ +/* 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; + + 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; + } + + + if (enc && !ec->key) + { + /* Generate random key */ + if (!ec->keylen) + ec->keylen = EVP_CIPHER_CTX_key_length(ctx); + ec->key = OPENSSL_malloc(ec->keylen); + if (!ec->key) + { + CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, + ERR_R_MALLOC_FAILURE); + goto err; + } + if (EVP_CIPHER_CTX_rand_key(ctx, ec->key) <= 0) + goto err; + keep_key = 1; + } + else if (ec->keylen != (unsigned int)EVP_CIPHER_CTX_key_length(ctx)) + { + /* If necessary set key length */ + if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) + { + CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, + CMS_R_INVALID_KEY_LENGTH); + goto err; + } + } + + 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 (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); + } |