-/* crypto/cms/cms_enc.c */
-/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+/*
+ * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project.
*/
/* ====================================================================
* are met:
*
* 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * 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
* ====================================================================
*/
-#include "cryptlib.h"
+#include "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>
#include <openssl/cms.h>
#include <openssl/rand.h>
#include "cms_lcl.h"
-#include "asn1_locl.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;
- 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)
- calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
-
- if (enc)
- {
- int ivlen;
- /* 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;
- }
-
-static 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;
- }
+{
+ 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;
+ }
+
+ 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 paremeter 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) {
+ ec->key = OPENSSL_malloc(keylen);
+ if (ec->key == NULL)
+ 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);
- }
+ 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->unprotectedAttrs)
- enc->version = 2;
- return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);
- }
+{
+ CMS_EncryptedData *enc = cms->d.encryptedData;
+ if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
+ enc->version = 2;
+ return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);
+}
projects / openssl.git / blobdiff