#include <openssl/err.h>
#include <openssl/cms.h>
#include <openssl/rand.h>
+#include <openssl/aes.h>
#include "cms_lcl.h"
#include "asn1_locl.h"
/* CMS EnvelopedData Utilities */
DECLARE_ASN1_ITEM(CMS_EnvelopedData)
-DECLARE_ASN1_ITEM(CMS_RecipientInfo)
DECLARE_ASN1_ITEM(CMS_KeyTransRecipientInfo)
+DECLARE_ASN1_ITEM(CMS_KEKRecipientInfo)
+DECLARE_ASN1_ITEM(CMS_OtherKeyAttribute)
DECLARE_STACK_OF(CMS_RecipientInfo)
-static CMS_EnvelopedData *cms_get0_enveloped(CMS_ContentInfo *cms)
+CMS_EnvelopedData *cms_get0_enveloped(CMS_ContentInfo *cms)
{
if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_enveloped)
{
return cms_get0_enveloped(cms);
}
+int cms_env_asn1_ctrl(CMS_RecipientInfo *ri, int cmd)
+ {
+ EVP_PKEY *pkey;
+ int i;
+ if (ri->type == CMS_RECIPINFO_TRANS)
+ pkey = ri->d.ktri->pkey;
+ else if (ri->type == CMS_RECIPINFO_AGREE)
+ {
+ EVP_PKEY_CTX *pctx = ri->d.kari->pctx;
+ if (!pctx)
+ return 0;
+ pkey = EVP_PKEY_CTX_get0_pkey(pctx);
+ if (!pkey)
+ return 0;
+ }
+ else
+ return 0;
+ if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
+ return 1;
+ i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_ENVELOPE, cmd, ri);
+ if (i == -2)
+ {
+ CMSerr(CMS_F_CMS_ENV_ASN1_CTRL,
+ CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
+ return 0;
+ }
+ if (i <= 0)
+ {
+ CMSerr(CMS_F_CMS_ENV_ASN1_CTRL, CMS_R_CTRL_FAILURE);
+ return 0;
+ }
+ return 1;
+ }
+
STACK_OF(CMS_RecipientInfo) *CMS_get0_RecipientInfos(CMS_ContentInfo *cms)
{
CMS_EnvelopedData *env;
- env = cms_enveloped_data_init(cms);
+ env = cms_get0_enveloped(cms);
if (!env)
return NULL;
return env->recipientInfos;
return ri->type;
}
-/* Add a recipient certificate. For now only handle key transport.
- * If we ever handle key agreement will need updating.
- */
+EVP_PKEY_CTX *CMS_RecipientInfo_get0_pkey_ctx(CMS_RecipientInfo *ri)
+ {
+ if (ri->type == CMS_RECIPINFO_TRANS)
+ return ri->d.ktri->pctx;
+ else if (ri->type == CMS_RECIPINFO_AGREE)
+ return ri->d.kari->pctx;
+ return NULL;
+ }
-CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms,
- X509 *recip, unsigned int flags)
+CMS_ContentInfo *CMS_EnvelopedData_create(const EVP_CIPHER *cipher)
{
- CMS_RecipientInfo *ri = NULL;
- CMS_KeyTransRecipientInfo *ktri;
+ CMS_ContentInfo *cms;
CMS_EnvelopedData *env;
- EVP_PKEY *pk = NULL;
- int i, type;
- /* Init enveloped data */
+ cms = CMS_ContentInfo_new();
+ if (!cms)
+ goto merr;
env = cms_enveloped_data_init(cms);
if (!env)
- goto err;
-
- /* Initialized recipient info */
- ri = M_ASN1_new_of(CMS_RecipientInfo);
- if (!ri)
goto merr;
+ if (!cms_EncryptedContent_init(env->encryptedContentInfo,
+ cipher, NULL, 0))
+ goto merr;
+ return cms;
+ merr:
+ if (cms)
+ CMS_ContentInfo_free(cms);
+ CMSerr(CMS_F_CMS_ENVELOPEDDATA_CREATE, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
- /* Initialize and add key transrport recipient info */
+/* Key Transport Recipient Info (KTRI) routines */
+
+/* Initialise a ktri based on passed certificate and key */
+
+static int cms_RecipientInfo_ktri_init(CMS_RecipientInfo *ri, X509 *recip,
+ EVP_PKEY *pk, unsigned int flags)
+ {
+ CMS_KeyTransRecipientInfo *ktri;
+ int idtype;
ri->d.ktri = M_ASN1_new_of(CMS_KeyTransRecipientInfo);
if (!ri->d.ktri)
- goto merr;
+ return 0;
ri->type = CMS_RECIPINFO_TRANS;
ktri = ri->d.ktri;
- X509_check_purpose(recip, -1, -1);
- pk = X509_get_pubkey(recip);
- if (!pk)
- {
- CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
- CMS_R_ERROR_GETTING_PUBLIC_KEY);
- goto err;
- }
- CRYPTO_add(&recip->references, 1, CRYPTO_LOCK_X509);
- CRYPTO_add(&pk->references, 1, CRYPTO_LOCK_EVP_PKEY);
- ktri->pkey = pk;
- ktri->recip = recip;
-
if (flags & CMS_USE_KEYID)
{
ktri->version = 2;
- type = CMS_RECIPINFO_KEYIDENTIFIER;
+ idtype = CMS_RECIPINFO_KEYIDENTIFIER;
}
else
{
ktri->version = 0;
- type = CMS_RECIPINFO_ISSUER_SERIAL;
+ idtype = CMS_RECIPINFO_ISSUER_SERIAL;
}
/* Not a typo: RecipientIdentifier and SignerIdentifier are the
* same structure.
*/
- if (!cms_set1_SignerIdentifier(ktri->rid, recip, type))
+ if (!cms_set1_SignerIdentifier(ktri->rid, recip, idtype))
+ return 0;
+
+ CRYPTO_add(&recip->references, 1, CRYPTO_LOCK_X509);
+ CRYPTO_add(&pk->references, 1, CRYPTO_LOCK_EVP_PKEY);
+ ktri->pkey = pk;
+ ktri->recip = recip;
+
+ if (flags & CMS_KEY_PARAM)
+ {
+ ktri->pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
+ if (!ktri->pctx)
+ return 0;
+ if (EVP_PKEY_encrypt_init(ktri->pctx) <= 0)
+ return 0;
+ }
+ else if (!cms_env_asn1_ctrl(ri, 0))
+ return 0;
+ return 1;
+ }
+
+/* Add a recipient certificate using appropriate type of RecipientInfo
+ */
+
+CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms,
+ X509 *recip, unsigned int flags)
+ {
+ CMS_RecipientInfo *ri = NULL;
+ CMS_EnvelopedData *env;
+ EVP_PKEY *pk = NULL;
+ env = cms_get0_enveloped(cms);
+ if (!env)
goto err;
- if (pk->ameth && pk->ameth->pkey_ctrl)
+ /* Initialize recipient info */
+ ri = M_ASN1_new_of(CMS_RecipientInfo);
+ if (!ri)
+ goto merr;
+
+ pk = X509_get_pubkey(recip);
+ if (!pk)
{
- i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_ENVELOPE,
- 0, ri);
- if (i == -2)
- {
- CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
- CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
+ CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
+ CMS_R_ERROR_GETTING_PUBLIC_KEY);
+ goto err;
+ }
+
+ switch (cms_pkey_get_ri_type(pk))
+ {
+
+ case CMS_RECIPINFO_TRANS:
+ if (!cms_RecipientInfo_ktri_init(ri, recip, pk, flags))
goto err;
- }
- if (i <= 0)
- {
- CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
- CMS_R_CTRL_FAILURE);
+ break;
+
+ case CMS_RECIPINFO_AGREE:
+ if (!cms_RecipientInfo_kari_init(ri, recip, pk, flags))
goto err;
- }
+ break;
+
+ default:
+ CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
+ CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
+ goto err;
+
}
if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
goto merr;
+ EVP_PKEY_free(pk);
+
return ri;
merr:
err:
if (ri)
M_ASN1_free_of(ri, CMS_RecipientInfo);
+ if (pk)
+ EVP_PKEY_free(pk);
return NULL;
}
CMS_R_NOT_KEY_TRANSPORT);
return -2;
}
-
return cms_SignerIdentifier_cert_cmp(ri->d.ktri->rid, cert);
}
-int CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,
- EVP_PKEY *pkey)
+int CMS_RecipientInfo_set0_pkey(CMS_RecipientInfo *ri, EVP_PKEY *pkey)
+ {
+ if (ri->type != CMS_RECIPINFO_TRANS)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PKEY,
+ CMS_R_NOT_KEY_TRANSPORT);
+ return 0;
+ }
+ ri->d.ktri->pkey = pkey;
+ return 1;
+ }
+
+/* Encrypt content key in key transport recipient info */
+
+static int cms_RecipientInfo_ktri_encrypt(CMS_ContentInfo *cms,
+ CMS_RecipientInfo *ri)
{
CMS_KeyTransRecipientInfo *ktri;
- EVP_PKEY_CTX *pctx = NULL;
+ CMS_EncryptedContentInfo *ec;
+ EVP_PKEY_CTX *pctx;
unsigned char *ek = NULL;
size_t eklen;
if (ri->type != CMS_RECIPINFO_TRANS)
{
- CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT,
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT,
CMS_R_NOT_KEY_TRANSPORT);
return 0;
}
ktri = ri->d.ktri;
+ ec = cms->d.envelopedData->encryptedContentInfo;
- pctx = EVP_PKEY_CTX_new(pkey, NULL);
- if (!pctx)
+ pctx = ktri->pctx;
+
+ if (pctx)
+ {
+ if (!cms_env_asn1_ctrl(ri, 0))
+ goto err;
+ }
+ else
+ {
+ pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
+ if (!pctx)
+ return 0;
+
+ if (EVP_PKEY_encrypt_init(pctx) <= 0)
+ goto err;
+ }
+
+ if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
+ EVP_PKEY_CTRL_CMS_ENCRYPT, 0, ri) <= 0)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, CMS_R_CTRL_ERROR);
+ goto err;
+ }
+
+ if (EVP_PKEY_encrypt(pctx, NULL, &eklen, ec->key, ec->keylen) <= 0)
+ goto err;
+
+ ek = OPENSSL_malloc(eklen);
+
+ if (ek == NULL)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT,
+ ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ if (EVP_PKEY_encrypt(pctx, ek, &eklen, ec->key, ec->keylen) <= 0)
+ goto err;
+
+ ASN1_STRING_set0(ktri->encryptedKey, ek, eklen);
+ ek = NULL;
+
+ ret = 1;
+
+ err:
+ if (pctx)
+ {
+ EVP_PKEY_CTX_free(pctx);
+ ktri->pctx = NULL;
+ }
+ if (ek)
+ OPENSSL_free(ek);
+ return ret;
+
+ }
+
+/* Decrypt content key from KTRI */
+
+static int cms_RecipientInfo_ktri_decrypt(CMS_ContentInfo *cms,
+ CMS_RecipientInfo *ri)
+ {
+ CMS_KeyTransRecipientInfo *ktri = ri->d.ktri;
+ EVP_PKEY *pkey = ktri->pkey;
+ unsigned char *ek = NULL;
+ size_t eklen;
+ int ret = 0;
+ CMS_EncryptedContentInfo *ec;
+ ec = cms->d.envelopedData->encryptedContentInfo;
+
+ if (ktri->pkey == NULL)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT,
+ CMS_R_NO_PRIVATE_KEY);
return 0;
+ }
- if (EVP_PKEY_decrypt_init(pctx) <= 0)
+ ktri->pctx = EVP_PKEY_CTX_new(pkey, NULL);
+ if (!ktri->pctx)
+ return 0;
+
+ if (EVP_PKEY_decrypt_init(ktri->pctx) <= 0)
+ goto err;
+
+ if (!cms_env_asn1_ctrl(ri, 1))
goto err;
- if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
+ if (EVP_PKEY_CTX_ctrl(ktri->pctx, -1, EVP_PKEY_OP_DECRYPT,
EVP_PKEY_CTRL_CMS_DECRYPT, 0, ri) <= 0)
{
- CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT, CMS_R_CTRL_ERROR);
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CTRL_ERROR);
goto err;
}
- if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
+ if (EVP_PKEY_decrypt(ktri->pctx, NULL, &eklen,
ktri->encryptedKey->data,
ktri->encryptedKey->length) <= 0)
goto err;
if (ek == NULL)
{
- CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT, ERR_R_MALLOC_FAILURE);
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT,
+ ERR_R_MALLOC_FAILURE);
goto err;
}
- if (EVP_PKEY_decrypt(pctx, ek, &eklen,
+ if (EVP_PKEY_decrypt(ktri->pctx, ek, &eklen,
ktri->encryptedKey->data,
ktri->encryptedKey->length) <= 0)
{
- CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT, CMS_R_CMS_LIB);
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CMS_LIB);
goto err;
}
ret = 1;
- cms->d.envelopedData->encryptedContentInfo->key = ek;
- cms->d.envelopedData->encryptedContentInfo->keylen = eklen;
+ if (ec->key)
+ {
+ OPENSSL_cleanse(ec->key, ec->keylen);
+ OPENSSL_free(ec->key);
+ }
+
+ ec->key = ek;
+ ec->keylen = eklen;
err:
- if (pctx)
- EVP_PKEY_CTX_free(pctx);
+ if (ktri->pctx)
+ {
+ EVP_PKEY_CTX_free(ktri->pctx);
+ ktri->pctx = NULL;
+ }
if (!ret && ek)
OPENSSL_free(ek);
return ret;
}
+/* Key Encrypted Key (KEK) RecipientInfo routines */
+
+int CMS_RecipientInfo_kekri_id_cmp(CMS_RecipientInfo *ri,
+ const unsigned char *id, size_t idlen)
+ {
+ ASN1_OCTET_STRING tmp_os;
+ CMS_KEKRecipientInfo *kekri;
+ if (ri->type != CMS_RECIPINFO_KEK)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ID_CMP, CMS_R_NOT_KEK);
+ return -2;
+ }
+ kekri = ri->d.kekri;
+ tmp_os.type = V_ASN1_OCTET_STRING;
+ tmp_os.flags = 0;
+ tmp_os.data = (unsigned char *)id;
+ tmp_os.length = (int)idlen;
+ return ASN1_OCTET_STRING_cmp(&tmp_os, kekri->kekid->keyIdentifier);
+ }
+
+/* For now hard code AES key wrap info */
+
+static size_t aes_wrap_keylen(int nid)
+ {
+ switch (nid)
+ {
+ case NID_id_aes128_wrap:
+ return 16;
+
+ case NID_id_aes192_wrap:
+ return 24;
+
+ case NID_id_aes256_wrap:
+ return 32;
+
+ default:
+ return 0;
+ }
+ }
+
+CMS_RecipientInfo *CMS_add0_recipient_key(CMS_ContentInfo *cms, int nid,
+ unsigned char *key, size_t keylen,
+ unsigned char *id, size_t idlen,
+ ASN1_GENERALIZEDTIME *date,
+ ASN1_OBJECT *otherTypeId,
+ ASN1_TYPE *otherType)
+ {
+ CMS_RecipientInfo *ri = NULL;
+ CMS_EnvelopedData *env;
+ CMS_KEKRecipientInfo *kekri;
+ env = cms_get0_enveloped(cms);
+ if (!env)
+ goto err;
+
+ if (nid == NID_undef)
+ {
+ switch (keylen)
+ {
+ case 16:
+ nid = NID_id_aes128_wrap;
+ break;
+
+ case 24:
+ nid = NID_id_aes192_wrap;
+ break;
+
+ case 32:
+ nid = NID_id_aes256_wrap;
+ break;
+
+ default:
+ CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
+ CMS_R_INVALID_KEY_LENGTH);
+ goto err;
+ }
+
+ }
+ else
+ {
+
+ size_t exp_keylen = aes_wrap_keylen(nid);
+
+ if (!exp_keylen)
+ {
+ CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
+ CMS_R_UNSUPPORTED_KEK_ALGORITHM);
+ goto err;
+ }
+
+ if (keylen != exp_keylen)
+ {
+ CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
+ CMS_R_INVALID_KEY_LENGTH);
+ goto err;
+ }
+
+ }
+
+ /* Initialize recipient info */
+ ri = M_ASN1_new_of(CMS_RecipientInfo);
+ if (!ri)
+ goto merr;
+
+ ri->d.kekri = M_ASN1_new_of(CMS_KEKRecipientInfo);
+ if (!ri->d.kekri)
+ goto merr;
+ ri->type = CMS_RECIPINFO_KEK;
+
+ kekri = ri->d.kekri;
+
+ if (otherTypeId)
+ {
+ kekri->kekid->other = M_ASN1_new_of(CMS_OtherKeyAttribute);
+ if (kekri->kekid->other == NULL)
+ goto merr;
+ }
+
+ if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
+ goto merr;
+
+
+ /* After this point no calls can fail */
+
+ kekri->version = 4;
+
+ kekri->key = key;
+ kekri->keylen = keylen;
+
+ ASN1_STRING_set0(kekri->kekid->keyIdentifier, id, idlen);
+
+ kekri->kekid->date = date;
+
+ if (kekri->kekid->other)
+ {
+ kekri->kekid->other->keyAttrId = otherTypeId;
+ kekri->kekid->other->keyAttr = otherType;
+ }
+
+ X509_ALGOR_set0(kekri->keyEncryptionAlgorithm,
+ OBJ_nid2obj(nid), V_ASN1_UNDEF, NULL);
+
+ return ri;
+
+ merr:
+ CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, ERR_R_MALLOC_FAILURE);
+ err:
+ if (ri)
+ M_ASN1_free_of(ri, CMS_RecipientInfo);
+ return NULL;
+
+ }
+
+int CMS_RecipientInfo_kekri_get0_id(CMS_RecipientInfo *ri,
+ X509_ALGOR **palg,
+ ASN1_OCTET_STRING **pid,
+ ASN1_GENERALIZEDTIME **pdate,
+ ASN1_OBJECT **potherid,
+ ASN1_TYPE **pothertype)
+ {
+ CMS_KEKIdentifier *rkid;
+ if (ri->type != CMS_RECIPINFO_KEK)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_GET0_ID, CMS_R_NOT_KEK);
+ return 0;
+ }
+ rkid = ri->d.kekri->kekid;
+ if (palg)
+ *palg = ri->d.kekri->keyEncryptionAlgorithm;
+ if (pid)
+ *pid = rkid->keyIdentifier;
+ if (pdate)
+ *pdate = rkid->date;
+ if (potherid)
+ {
+ if (rkid->other)
+ *potherid = rkid->other->keyAttrId;
+ else
+ *potherid = NULL;
+ }
+ if (pothertype)
+ {
+ if (rkid->other)
+ *pothertype = rkid->other->keyAttr;
+ else
+ *pothertype = NULL;
+ }
+ return 1;
+ }
+
+int CMS_RecipientInfo_set0_key(CMS_RecipientInfo *ri,
+ unsigned char *key, size_t keylen)
+ {
+ CMS_KEKRecipientInfo *kekri;
+ if (ri->type != CMS_RECIPINFO_KEK)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_KEY, CMS_R_NOT_KEK);
+ return 0;
+ }
+
+ kekri = ri->d.kekri;
+ kekri->key = key;
+ kekri->keylen = keylen;
+ return 1;
+ }
+
+
+/* Encrypt content key in KEK recipient info */
+
+static int cms_RecipientInfo_kekri_encrypt(CMS_ContentInfo *cms,
+ CMS_RecipientInfo *ri)
+ {
+ CMS_EncryptedContentInfo *ec;
+ CMS_KEKRecipientInfo *kekri;
+ AES_KEY actx;
+ unsigned char *wkey = NULL;
+ int wkeylen;
+ int r = 0;
+
+ ec = cms->d.envelopedData->encryptedContentInfo;
+
+ kekri = ri->d.kekri;
+
+ if (!kekri->key)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_NO_KEY);
+ return 0;
+ }
+
+ if (AES_set_encrypt_key(kekri->key, kekri->keylen << 3, &actx))
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT,
+ CMS_R_ERROR_SETTING_KEY);
+ goto err;
+ }
+
+ wkey = OPENSSL_malloc(ec->keylen + 8);
+
+ if (!wkey)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT,
+ ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ wkeylen = AES_wrap_key(&actx, NULL, wkey, ec->key, ec->keylen);
+
+ if (wkeylen <= 0)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_WRAP_ERROR);
+ goto err;
+ }
+
+ ASN1_STRING_set0(kekri->encryptedKey, wkey, wkeylen);
+
+ r = 1;
+
+ err:
+
+ if (!r && wkey)
+ OPENSSL_free(wkey);
+ OPENSSL_cleanse(&actx, sizeof(actx));
+
+ return r;
+
+ }
+
+/* Decrypt content key in KEK recipient info */
+
+static int cms_RecipientInfo_kekri_decrypt(CMS_ContentInfo *cms,
+ CMS_RecipientInfo *ri)
+ {
+ CMS_EncryptedContentInfo *ec;
+ CMS_KEKRecipientInfo *kekri;
+ AES_KEY actx;
+ unsigned char *ukey = NULL;
+ int ukeylen;
+ int r = 0, wrap_nid;
+
+ ec = cms->d.envelopedData->encryptedContentInfo;
+
+ kekri = ri->d.kekri;
+
+ if (!kekri->key)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_NO_KEY);
+ return 0;
+ }
+
+ wrap_nid = OBJ_obj2nid(kekri->keyEncryptionAlgorithm->algorithm);
+ if (aes_wrap_keylen(wrap_nid) != kekri->keylen)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
+ CMS_R_INVALID_KEY_LENGTH);
+ return 0;
+ }
+
+ /* If encrypted key length is invalid don't bother */
+
+ if (kekri->encryptedKey->length < 16)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
+ CMS_R_INVALID_ENCRYPTED_KEY_LENGTH);
+ goto err;
+ }
+
+ if (AES_set_decrypt_key(kekri->key, kekri->keylen << 3, &actx))
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
+ CMS_R_ERROR_SETTING_KEY);
+ goto err;
+ }
+
+ ukey = OPENSSL_malloc(kekri->encryptedKey->length - 8);
+
+ if (!ukey)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
+ ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ ukeylen = AES_unwrap_key(&actx, NULL, ukey,
+ kekri->encryptedKey->data,
+ kekri->encryptedKey->length);
+
+ if (ukeylen <= 0)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
+ CMS_R_UNWRAP_ERROR);
+ goto err;
+ }
+
+ ec->key = ukey;
+ ec->keylen = ukeylen;
+
+ r = 1;
+
+ err:
+
+ if (!r && ukey)
+ OPENSSL_free(ukey);
+ OPENSSL_cleanse(&actx, sizeof(actx));
+
+ return r;
+
+ }
+
+int CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
+ {
+ switch(ri->type)
+ {
+ case CMS_RECIPINFO_TRANS:
+ return cms_RecipientInfo_ktri_decrypt(cms, ri);
+
+ case CMS_RECIPINFO_KEK:
+ return cms_RecipientInfo_kekri_decrypt(cms, ri);
+
+ case CMS_RECIPINFO_PASS:
+ return cms_RecipientInfo_pwri_crypt(cms, ri, 0);
+
+ default:
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT,
+ CMS_R_UNSUPPORTED_RECPIENTINFO_TYPE);
+ return 0;
+ }
+ }
+
+int CMS_RecipientInfo_encrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
+ {
+ switch (ri->type)
+ {
+ case CMS_RECIPINFO_TRANS:
+ return cms_RecipientInfo_ktri_encrypt(cms, ri);
+
+ case CMS_RECIPINFO_AGREE:
+ return cms_RecipientInfo_kari_encrypt(cms, ri);
+
+ case CMS_RECIPINFO_KEK:
+ return cms_RecipientInfo_kekri_encrypt(cms, ri);
+ break;
+
+ case CMS_RECIPINFO_PASS:
+ return cms_RecipientInfo_pwri_crypt(cms, ri, 1);
+ break;
+
+ default:
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_ENCRYPT,
+ CMS_R_UNSUPPORTED_RECIPIENT_TYPE);
+ return 0;
+ }
+ }
+
+/* Check structures and fixup version numbers (if necessary) */
+
+static void cms_env_set_originfo_version(CMS_EnvelopedData *env)
+ {
+ CMS_OriginatorInfo *org = env->originatorInfo;
+ int i;
+ if (org == NULL)
+ return;
+ for (i = 0; i < sk_CMS_CertificateChoices_num(org->certificates); i++)
+ {
+ CMS_CertificateChoices *cch;
+ cch = sk_CMS_CertificateChoices_value(org->certificates, i);
+ if (cch->type == CMS_CERTCHOICE_OTHER)
+ {
+ env->version = 4;
+ return;
+ }
+ else if (cch->type == CMS_CERTCHOICE_V2ACERT)
+ {
+ if (env->version < 3)
+ env->version = 3;
+ }
+ }
+
+ for (i = 0; i < sk_CMS_RevocationInfoChoice_num(org->crls); i++)
+ {
+ CMS_RevocationInfoChoice *rch;
+ rch = sk_CMS_RevocationInfoChoice_value(org->crls, i);
+ if (rch->type == CMS_REVCHOICE_OTHER)
+ {
+ env->version = 4;
+ return;
+ }
+ }
+ }
+
+static void cms_env_set_version(CMS_EnvelopedData *env)
+ {
+ int i;
+ CMS_RecipientInfo *ri;
+
+ /* Can't set version higher than 4 so if 4 or more already nothing
+ * to do.
+ */
+ if (env->version >= 4)
+ return;
+
+ cms_env_set_originfo_version(env);
+
+ if (env->version >= 3)
+ return;
+
+ for (i = 0; i < sk_CMS_RecipientInfo_num(env->recipientInfos); i++)
+ {
+ ri = sk_CMS_RecipientInfo_value(env->recipientInfos, i);
+ if (ri->type == CMS_RECIPINFO_PASS || ri->type == CMS_RECIPINFO_OTHER)
+ {
+ env->version = 3;
+ return;
+ }
+ else if (ri->type != CMS_RECIPINFO_TRANS || ri->d.ktri->version != 0)
+ {
+ env->version = 2;
+ }
+ }
+ if (env->version == 2)
+ return;
+ if (env->originatorInfo || env->unprotectedAttrs)
+ env->version = 2;
+ env->version = 0;
+ }
+
BIO *cms_EnvelopedData_init_bio(CMS_ContentInfo *cms)
{
CMS_EncryptedContentInfo *ec;
+ STACK_OF(CMS_RecipientInfo) *rinfos;
+ CMS_RecipientInfo *ri;
+ int i, ok = 0;
+ BIO *ret;
+
+ /* Get BIO first to set up key */
+
ec = cms->d.envelopedData->encryptedContentInfo;
- return cms_EncryptedContent_init_bio(ec);
+ ret = cms_EncryptedContent_init_bio(ec);
+
+ /* If error or no cipher end of processing */
+
+ if (!ret || !ec->cipher)
+ return ret;
+
+ /* Now encrypt content key according to each RecipientInfo type */
+
+ rinfos = cms->d.envelopedData->recipientInfos;
+
+ for (i = 0; i < sk_CMS_RecipientInfo_num(rinfos); i++)
+ {
+ ri = sk_CMS_RecipientInfo_value(rinfos, i);
+ if (CMS_RecipientInfo_encrypt(cms, ri) <= 0)
+ {
+ CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO,
+ CMS_R_ERROR_SETTING_RECIPIENTINFO);
+ goto err;
+ }
+ }
+ cms_env_set_version(cms->d.envelopedData);
+
+ ok = 1;
+
+ err:
+ ec->cipher = NULL;
+ if (ec->key)
+ {
+ OPENSSL_cleanse(ec->key, ec->keylen);
+ OPENSSL_free(ec->key);
+ ec->key = NULL;
+ ec->keylen = 0;
+ }
+ if (ok)
+ return ret;
+ BIO_free(ret);
+ return NULL;
+
+ }
+/* Get RecipientInfo type (if any) supported by a key (public or private).
+ * To retain compatibility with previous behaviour if the ctrl value isn't
+ * supported we assume key transport.
+ */
+int cms_pkey_get_ri_type(EVP_PKEY *pk)
+ {
+ if (pk->ameth && pk->ameth->pkey_ctrl)
+ {
+ int i, r;
+ i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_RI_TYPE, 0, &r);
+ if (i > 0)
+ return r;
+ }
+ return CMS_RECIPINFO_TRANS;
}
projects / openssl.git / blobdiff