#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 */
+DECLARE_ASN1_ITEM(CMS_EncryptedData)
-int cms_bio_to_EncryptedContent(CMS_EncryptedContentInfo *ec,
- const unsigned char *key, int keylen,
- BIO *b)
+/* Return BIO based on EncryptedContentInfo and key */
+
+BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec)
{
- EVP_CIPHER_CTX *ctx = NULL;
- unsigned char iv[EVP_MAX_IV_LENGTH], *piv;
- int ivlen;
+ 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;
- BIO_get_cipher_ctx(b, &ctx);
+ int ok = 0;
- /* If necessary set key length */
+ int enc, keep_key = 0;
- if (keylen != EVP_CIPHER_CTX_key_length(ctx))
+ enc = ec->cipher ? 1 : 0;
+
+ b = BIO_new(BIO_f_cipher());
+ if (!b)
{
- if (EVP_CIPHER_CTX_set_key_length(ctx, keylen) <= 0)
- {
- CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
- CMS_R_INVALID_KEY_LENGTH);
- return 0;
- }
+ CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+ ERR_R_MALLOC_FAILURE);
+ return NULL;
}
- /* Generate a random IV if we need one */
+ BIO_get_cipher_ctx(b, &ctx);
- ivlen = EVP_CIPHER_CTX_iv_length(ctx);
- if (ivlen > 0)
+ if (enc)
{
- if (RAND_pseudo_bytes(iv, ivlen) <= 0)
- return 0;
- piv = iv;
+ ciph = ec->cipher;
+ /* If not keeping key set cipher to NULL so subsequent calls
+ * decrypt.
+ */
+ if (ec->key)
+ ec->cipher = NULL;
}
else
- piv = NULL;
+ {
+ 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, NULL, NULL, key, piv, 1) <= 0)
+ if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0)
{
- CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
+ CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
CMS_R_CIPHER_INITIALISATION_ERROR);
- return 0;
+ goto err;
}
- ec->contentEncryptionAlgorithm->algorithm =
- OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
-
- if (piv)
+ if (enc)
{
- 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)
+ 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)
{
- CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
- CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
- return 0;
+ if (RAND_pseudo_bytes(iv, ivlen) <= 0)
+ goto err;
+ piv = iv;
}
}
-
- 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)
+ else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0)
{
- CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO, ERR_R_MALLOC_FAILURE);
- return NULL;
+ CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+ CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
+ goto err;
}
- BIO_get_cipher_ctx(b, &ctx);
-
- ciph = EVP_get_cipherbyobj(ec->contentEncryptionAlgorithm->algorithm);
-
- if (!ciph)
+ tkeylen = EVP_CIPHER_CTX_key_length(ctx);
+ /* Generate random session key */
+ if (!enc || !ec->key)
{
- CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO, CMS_R_UNKNOWN_CIPHER);
- goto err;
+ 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 (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, 0) <= 0)
+ if (!ec->key)
{
- CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
- CMS_R_CIPHER_INITIALISATION_ERROR);
- goto err;
+ ec->key = tkey;
+ ec->keylen = tkeylen;
+ tkey = NULL;
+ if (enc)
+ keep_key = 1;
+ else
+ ERR_clear_error();
+
}
- /* If necessary set key length */
-
- if (keylen != EVP_CIPHER_CTX_key_length(ctx))
+ if (ec->keylen != tkeylen)
{
- if (EVP_CIPHER_CTX_set_key_length(ctx, keylen) <= 0)
+ /* If necessary set key length */
+ if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0)
{
- CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
- CMS_R_INVALID_KEY_LENGTH);
- goto err;
+ /* 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, key, NULL, 0) <= 0)
+ if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0)
{
- CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
+ CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
CMS_R_CIPHER_INITIALISATION_ERROR);
goto err;
}
- if (EVP_CIPHER_asn1_to_param(ctx,
- ec->contentEncryptionAlgorithm->parameter) <= 0)
+ 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_TO_BIO,
+ CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
goto err;
}
- return b;
+ }
+ 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);
+ }
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