diff options
Diffstat (limited to 'lib/libcrypto/cms/cms_enc.c')
| -rw-r--r-- | lib/libcrypto/cms/cms_enc.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/lib/libcrypto/cms/cms_enc.c b/lib/libcrypto/cms/cms_enc.c new file mode 100644 index 00000000000..a1719830e8d --- /dev/null +++ b/lib/libcrypto/cms/cms_enc.c @@ -0,0 +1,213 @@ +/* + * Copyright 2008-2018 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include "internal/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 */ + +/* 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 == NULL) { + 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_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 == NULL) { + 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_clear_free(ec->key, ec->keylen); + 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 (enc) { + calg->parameter = ASN1_TYPE_new(); + if (calg->parameter == NULL) { + 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; + } + /* If parameter type not set omit parameter */ + if (calg->parameter->type == V_ASN1_UNDEF) { + ASN1_TYPE_free(calg->parameter); + calg->parameter = NULL; + } + } + ok = 1; + + err: + if (!keep_key || !ok) { + OPENSSL_clear_free(ec->key, ec->keylen); + ec->key = NULL; + } + OPENSSL_clear_free(tkey, tkeylen); + 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) { + if ((ec->key = OPENSSL_malloc(keylen)) == NULL) { + CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT, ERR_R_MALLOC_FAILURE); + 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); +} |