static LUA_FUNCTION(openssl_cipher_ctx_info)
{
EVP_CIPHER_CTX *ctx = CHECK_OBJECT(1, EVP_CIPHER_CTX, "openssl.evp_cipher_ctx");
lua_newtable(L);
AUXILIAR_SET(L, -1, "block_size", EVP_CIPHER_CTX_block_size(ctx), integer);
AUXILIAR_SET(L, -1, "key_length", EVP_CIPHER_CTX_key_length(ctx), integer);
AUXILIAR_SET(L, -1, "iv_length", EVP_CIPHER_CTX_iv_length(ctx), integer);
AUXILIAR_SET(L, -1, "flags", EVP_CIPHER_CTX_flags(ctx), integer);
AUXILIAR_SET(L, -1, "nid", EVP_CIPHER_CTX_nid(ctx), integer);
AUXILIAR_SET(L, -1, "type", EVP_CIPHER_CTX_mode(ctx), integer);
AUXILIAR_SET(L, -1, "mode", EVP_CIPHER_CTX_type(ctx), integer);
AUXILIAR_SETOBJECT(L, EVP_CIPHER_CTX_cipher(ctx), "openssl.evp_cipher", -1, "cipher");
return 1;
}
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) {
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) {
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 (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 (!keep_key) {
OPENSSL_clear_free(ec->key, ec->keylen);
ec->key = NULL;
}
OPENSSL_clear_free(tkey, tkeylen);
if (ok)
return b;
BIO_free(b);
return NULL;
}
static int dh_cms_encrypt(CMS_RecipientInfo *ri)
{
EVP_PKEY_CTX *pctx;
EVP_PKEY *pkey;
EVP_CIPHER_CTX *ctx;
int keylen;
X509_ALGOR *talg, *wrap_alg = NULL;
ASN1_OBJECT *aoid;
ASN1_BIT_STRING *pubkey;
ASN1_STRING *wrap_str;
ASN1_OCTET_STRING *ukm;
unsigned char *penc = NULL, *dukm = NULL;
int penclen;
size_t dukmlen = 0;
int rv = 0;
int kdf_type, wrap_nid;
const EVP_MD *kdf_md;
pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
if (!pctx)
return 0;
/* Get ephemeral key */
pkey = EVP_PKEY_CTX_get0_pkey(pctx);
if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
NULL, NULL, NULL))
goto err;
X509_ALGOR_get0(&aoid, NULL, NULL, talg);
/* Is everything uninitialised? */
if (aoid == OBJ_nid2obj(NID_undef)) {
ASN1_INTEGER *pubk;
pubk = BN_to_ASN1_INTEGER(pkey->pkey.dh->pub_key, NULL);
if (!pubk)
goto err;
/* Set the key */
penclen = i2d_ASN1_INTEGER(pubk, &penc);
ASN1_INTEGER_free(pubk);
if (penclen <= 0)
goto err;
ASN1_STRING_set0(pubkey, penc, penclen);
pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
penc = NULL;
X509_ALGOR_set0(talg, OBJ_nid2obj(NID_dhpublicnumber),
V_ASN1_UNDEF, NULL);
}
/* See if custom paraneters set */
kdf_type = EVP_PKEY_CTX_get_dh_kdf_type(pctx);
if (kdf_type <= 0)
goto err;
if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx, &kdf_md))
goto err;
if (kdf_type == EVP_PKEY_DH_KDF_NONE) {
kdf_type = EVP_PKEY_DH_KDF_X9_42;
if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, kdf_type) <= 0)
goto err;
} else if (kdf_type != EVP_PKEY_DH_KDF_X9_42)
/* Unknown KDF */
goto err;
if (kdf_md == NULL) {
/* Only SHA1 supported */
kdf_md = EVP_sha1();
if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, kdf_md) <= 0)
goto err;
} else if (EVP_MD_type(kdf_md) != NID_sha1)
/* Unsupported digest */
goto err;
if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
goto err;
/* Get wrap NID */
ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
wrap_nid = EVP_CIPHER_CTX_type(ctx);
if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx, OBJ_nid2obj(wrap_nid)) <= 0)
goto err;
keylen = EVP_CIPHER_CTX_key_length(ctx);
/* Package wrap algorithm in an AlgorithmIdentifier */
wrap_alg = X509_ALGOR_new();
if (!wrap_alg)
goto err;
wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
wrap_alg->parameter = ASN1_TYPE_new();
if (!wrap_alg->parameter)
goto err;
if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
goto err;
if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
ASN1_TYPE_free(wrap_alg->parameter);
wrap_alg->parameter = NULL;
}
if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0)
goto err;
if (ukm) {
dukmlen = ASN1_STRING_length(ukm);
dukm = BUF_memdup(ASN1_STRING_data(ukm), dukmlen);
if (!dukm)
goto err;
}
if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
goto err;
dukm = NULL;
/*
* Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
* of another AlgorithmIdentifier.
*/
penc = NULL;
penclen = i2d_X509_ALGOR(wrap_alg, &penc);
if (!penc || !penclen)
goto err;
wrap_str = ASN1_STRING_new();
if (!wrap_str)
goto err;
ASN1_STRING_set0(wrap_str, penc, penclen);
penc = NULL;
X509_ALGOR_set0(talg, OBJ_nid2obj(NID_id_smime_alg_ESDH),
V_ASN1_SEQUENCE, wrap_str);
rv = 1;
err:
if (penc)
OPENSSL_free(penc);
if (wrap_alg)
X509_ALGOR_free(wrap_alg);
return rv;
}
static int ecdh_cms_encrypt(CMS_RecipientInfo *ri)
{
EVP_PKEY_CTX *pctx;
EVP_PKEY *pkey;
EVP_CIPHER_CTX *ctx;
int keylen;
X509_ALGOR *talg, *wrap_alg = NULL;
ASN1_OBJECT *aoid;
ASN1_BIT_STRING *pubkey;
ASN1_STRING *wrap_str;
ASN1_OCTET_STRING *ukm;
unsigned char *penc = NULL;
int penclen;
int rv = 0;
int ecdh_nid, kdf_type, kdf_nid, wrap_nid;
const EVP_MD *kdf_md;
pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
if (!pctx)
return 0;
/* Get ephemeral key */
pkey = EVP_PKEY_CTX_get0_pkey(pctx);
if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
NULL, NULL, NULL))
goto err;
X509_ALGOR_get0(&aoid, NULL, NULL, talg);
/* Is everything uninitialised? */
if (aoid == OBJ_nid2obj(NID_undef)) {
EC_KEY *eckey = pkey->pkey.ec;
/* Set the key */
unsigned char *p;
penclen = i2o_ECPublicKey(eckey, NULL);
if (penclen <= 0)
goto err;
penc = OPENSSL_malloc(penclen);
if (!penc)
goto err;
p = penc;
penclen = i2o_ECPublicKey(eckey, &p);
if (penclen <= 0)
goto err;
ASN1_STRING_set0(pubkey, penc, penclen);
pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
penc = NULL;
X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
V_ASN1_UNDEF, NULL);
}
/* See if custom paraneters set */
kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx);
if (kdf_type <= 0)
goto err;
if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md))
goto err;
ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx);
if (ecdh_nid < 0)
goto err;
else if (ecdh_nid == 0)
ecdh_nid = NID_dh_std_kdf;
else if (ecdh_nid == 1)
ecdh_nid = NID_dh_cofactor_kdf;
if (kdf_type == EVP_PKEY_ECDH_KDF_NONE) {
kdf_type = EVP_PKEY_ECDH_KDF_X9_62;
if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
goto err;
} else
/* Uknown KDF */
goto err;
if (kdf_md == NULL) {
/* Fixme later for better MD */
kdf_md = EVP_sha1();
if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
goto err;
}
if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
goto err;
/* Lookup NID for KDF+cofactor+digest */
if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid))
goto err;
/* Get wrap NID */
ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
wrap_nid = EVP_CIPHER_CTX_type(ctx);
keylen = EVP_CIPHER_CTX_key_length(ctx);
/* Package wrap algorithm in an AlgorithmIdentifier */
wrap_alg = X509_ALGOR_new();
if (!wrap_alg)
goto err;
wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
wrap_alg->parameter = ASN1_TYPE_new();
if (!wrap_alg->parameter)
goto err;
if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
goto err;
if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
ASN1_TYPE_free(wrap_alg->parameter);
wrap_alg->parameter = NULL;
}
if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
goto err;
penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen);
if (!penclen)
goto err;
if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0)
goto err;
penc = NULL;
/*
* Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
* of another AlgorithmIdentifier.
*/
penclen = i2d_X509_ALGOR(wrap_alg, &penc);
if (!penc || !penclen)
goto err;
wrap_str = ASN1_STRING_new();
if (!wrap_str)
goto err;
ASN1_STRING_set0(wrap_str, penc, penclen);
penc = NULL;
X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str);
rv = 1;
err:
OPENSSL_free(penc);
X509_ALGOR_free(wrap_alg);
return rv;
}
CMS_RecipientInfo *
CMS_add0_recipient_password(CMS_ContentInfo *cms, int iter, int wrap_nid,
int pbe_nid, unsigned char *pass, ssize_t passlen,
const EVP_CIPHER *kekciph)
{
CMS_RecipientInfo *ri = NULL;
CMS_EnvelopedData *env;
CMS_PasswordRecipientInfo *pwri;
EVP_CIPHER_CTX ctx;
X509_ALGOR *encalg = NULL;
unsigned char iv[EVP_MAX_IV_LENGTH];
int ivlen;
env = cms_get0_enveloped(cms);
if (!env)
return NULL;
if (wrap_nid <= 0)
wrap_nid = NID_id_alg_PWRI_KEK;
if (pbe_nid <= 0)
pbe_nid = NID_id_pbkdf2;
/* Get from enveloped data */
if (kekciph == NULL)
kekciph = env->encryptedContentInfo->cipher;
if (kekciph == NULL) {
CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, CMS_R_NO_CIPHER);
return NULL;
}
if (wrap_nid != NID_id_alg_PWRI_KEK) {
CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
return NULL;
}
/* Setup algorithm identifier for cipher */
encalg = X509_ALGOR_new();
EVP_CIPHER_CTX_init(&ctx);
if (EVP_EncryptInit_ex(&ctx, kekciph, NULL, NULL, NULL) <= 0) {
CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB);
goto err;
}
ivlen = EVP_CIPHER_CTX_iv_length(&ctx);
if (ivlen > 0) {
arc4random_buf(iv, ivlen);
if (EVP_EncryptInit_ex(&ctx, NULL, NULL, NULL, iv) <= 0) {
CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
ERR_R_EVP_LIB);
goto err;
}
encalg->parameter = ASN1_TYPE_new();
if (!encalg->parameter) {
CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
ERR_R_MALLOC_FAILURE);
goto err;
}
if (EVP_CIPHER_param_to_asn1(&ctx, encalg->parameter) <= 0) {
CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
goto err;
}
}
encalg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(&ctx));
EVP_CIPHER_CTX_cleanup(&ctx);
/* Initialize recipient info */
ri = M_ASN1_new_of(CMS_RecipientInfo);
if (!ri)
goto merr;
ri->d.pwri = M_ASN1_new_of(CMS_PasswordRecipientInfo);
if (!ri->d.pwri)
goto merr;
ri->type = CMS_RECIPINFO_PASS;
pwri = ri->d.pwri;
/* Since this is overwritten, free up empty structure already there */
X509_ALGOR_free(pwri->keyEncryptionAlgorithm);
pwri->keyEncryptionAlgorithm = X509_ALGOR_new();
if (!pwri->keyEncryptionAlgorithm)
goto merr;
pwri->keyEncryptionAlgorithm->algorithm = OBJ_nid2obj(wrap_nid);
pwri->keyEncryptionAlgorithm->parameter = ASN1_TYPE_new();
if (!pwri->keyEncryptionAlgorithm->parameter)
goto merr;
if (!ASN1_item_pack(encalg, ASN1_ITEM_rptr(X509_ALGOR),
&pwri->keyEncryptionAlgorithm->parameter->value.sequence))
goto merr;
pwri->keyEncryptionAlgorithm->parameter->type = V_ASN1_SEQUENCE;
X509_ALGOR_free(encalg);
encalg = NULL;
/* Setup PBE algorithm */
pwri->keyDerivationAlgorithm = PKCS5_pbkdf2_set(iter, NULL, 0, -1, -1);
if (!pwri->keyDerivationAlgorithm)
goto err;
CMS_RecipientInfo_set0_password(ri, pass, passlen);
pwri->version = 0;
if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
goto merr;
return ri;
merr:
CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE);
err:
EVP_CIPHER_CTX_cleanup(&ctx);
if (ri)
M_ASN1_free_of(ri, CMS_RecipientInfo);
if (encalg)
X509_ALGOR_free(encalg);
return NULL;
}
