diff options
Diffstat (limited to 'openssl/crypto/cms/cms_pwri.c')
| -rw-r--r-- | openssl/crypto/cms/cms_pwri.c | 454 |
1 files changed, 454 insertions, 0 deletions
diff --git a/openssl/crypto/cms/cms_pwri.c b/openssl/crypto/cms/cms_pwri.c new file mode 100644 index 000000000..b79612a12 --- /dev/null +++ b/openssl/crypto/cms/cms_pwri.c @@ -0,0 +1,454 @@ +/* crypto/cms/cms_pwri.c */ +/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL + * project. + */ +/* ==================================================================== + * Copyright (c) 2009 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * 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 + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * licensing@OpenSSL.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + */ + +#include "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 <openssl/aes.h> +#include "cms_lcl.h" +#include "asn1_locl.h" + +int CMS_RecipientInfo_set0_password(CMS_RecipientInfo *ri, + unsigned char *pass, ossl_ssize_t passlen) + { + CMS_PasswordRecipientInfo *pwri; + if (ri->type != CMS_RECIPINFO_PASS) + { + CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PASSWORD, CMS_R_NOT_PWRI); + return 0; + } + + pwri = ri->d.pwri; + pwri->pass = pass; + if (pass && passlen < 0) + passlen = strlen((char *)pass); + pwri->passlen = passlen; + return 1; + } + +CMS_RecipientInfo *CMS_add0_recipient_password(CMS_ContentInfo *cms, + int iter, int wrap_nid, int pbe_nid, + unsigned char *pass, + ossl_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) + goto err; + + 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) + { + if (RAND_pseudo_bytes(iv, ivlen) <= 0) + goto err; + 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; + + } + +/* This is an implementation of the key wrapping mechanism in RFC3211, + * at some point this should go into EVP. + */ + +static int kek_unwrap_key(unsigned char *out, size_t *outlen, + const unsigned char *in, size_t inlen, EVP_CIPHER_CTX *ctx) + { + size_t blocklen = EVP_CIPHER_CTX_block_size(ctx); + unsigned char *tmp; + int outl, rv = 0; + if (inlen < 2 * blocklen) + { + /* too small */ + return 0; + } + if (inlen % blocklen) + { + /* Invalid size */ + return 0; + } + tmp = OPENSSL_malloc(inlen); + /* setup IV by decrypting last two blocks */ + EVP_DecryptUpdate(ctx, tmp + inlen - 2 * blocklen, &outl, + in + inlen - 2 * blocklen, blocklen * 2); + /* Do a decrypt of last decrypted block to set IV to correct value + * output it to start of buffer so we don't corrupt decrypted block + * this works because buffer is at least two block lengths long. + */ + EVP_DecryptUpdate(ctx, tmp, &outl, + tmp + inlen - blocklen, blocklen); + /* Can now decrypt first n - 1 blocks */ + EVP_DecryptUpdate(ctx, tmp, &outl, in, inlen - blocklen); + + /* Reset IV to original value */ + EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL); + /* Decrypt again */ + EVP_DecryptUpdate(ctx, tmp, &outl, tmp, inlen); + /* Check check bytes */ + if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) & (tmp[3] ^ tmp[6])) != 0xff) + { + /* Check byte failure */ + goto err; + } + if (inlen < (size_t)(tmp[0] - 4 )) + { + /* Invalid length value */ + goto err; + } + *outlen = (size_t)tmp[0]; + memcpy(out, tmp + 4, *outlen); + rv = 1; + err: + OPENSSL_cleanse(tmp, inlen); + OPENSSL_free(tmp); + return rv; + + } + +static int kek_wrap_key(unsigned char *out, size_t *outlen, + const unsigned char *in, size_t inlen, EVP_CIPHER_CTX *ctx) + { + size_t blocklen = EVP_CIPHER_CTX_block_size(ctx); + size_t olen; + int dummy; + /* First decide length of output buffer: need header and round up to + * multiple of block length. + */ + olen = (inlen + 4 + blocklen - 1)/blocklen; + olen *= blocklen; + if (olen < 2 * blocklen) + { + /* Key too small */ + return 0; + } + if (inlen > 0xFF) + { + /* Key too large */ + return 0; + } + if (out) + { + /* Set header */ + out[0] = (unsigned char)inlen; + out[1] = in[0] ^ 0xFF; + out[2] = in[1] ^ 0xFF; + out[3] = in[2] ^ 0xFF; + memcpy(out + 4, in, inlen); + /* Add random padding to end */ + if (olen > inlen + 4) + RAND_pseudo_bytes(out + 4 + inlen, olen - 4 - inlen); + /* Encrypt twice */ + EVP_EncryptUpdate(ctx, out, &dummy, out, olen); + EVP_EncryptUpdate(ctx, out, &dummy, out, olen); + } + + *outlen = olen; + + return 1; + } + +/* Encrypt/Decrypt content key in PWRI recipient info */ + +int cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri, + int en_de) + { + CMS_EncryptedContentInfo *ec; + CMS_PasswordRecipientInfo *pwri; + const unsigned char *p = NULL; + int plen; + int r = 0; + X509_ALGOR *algtmp, *kekalg = NULL; + EVP_CIPHER_CTX kekctx; + const EVP_CIPHER *kekcipher; + unsigned char *key = NULL; + size_t keylen; + + ec = cms->d.envelopedData->encryptedContentInfo; + + pwri = ri->d.pwri; + EVP_CIPHER_CTX_init(&kekctx); + + if (!pwri->pass) + { + CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_NO_PASSWORD); + return 0; + } + algtmp = pwri->keyEncryptionAlgorithm; + + if (!algtmp || OBJ_obj2nid(algtmp->algorithm) != NID_id_alg_PWRI_KEK) + { + CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, + CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM); + return 0; + } + + if (algtmp->parameter->type == V_ASN1_SEQUENCE) + { + p = algtmp->parameter->value.sequence->data; + plen = algtmp->parameter->value.sequence->length; + kekalg = d2i_X509_ALGOR(NULL, &p, plen); + } + if (kekalg == NULL) + { + CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, + CMS_R_INVALID_KEY_ENCRYPTION_PARAMETER); + return 0; + } + + kekcipher = EVP_get_cipherbyobj(kekalg->algorithm); + + if(!kekcipher) + { + CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, + CMS_R_UNKNOWN_CIPHER); + goto err; + } + + /* Fixup cipher based on AlgorithmIdentifier to set IV etc */ + if (!EVP_CipherInit_ex(&kekctx, kekcipher, NULL, NULL, NULL, en_de)) + goto err; + EVP_CIPHER_CTX_set_padding(&kekctx, 0); + if(EVP_CIPHER_asn1_to_param(&kekctx, kekalg->parameter) < 0) + { + CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, + CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); + goto err; + } + + algtmp = pwri->keyDerivationAlgorithm; + + /* Finish password based key derivation to setup key in "ctx" */ + + if (EVP_PBE_CipherInit(algtmp->algorithm, + (char *)pwri->pass, pwri->passlen, + algtmp->parameter, &kekctx, en_de) < 0) + { + CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_EVP_LIB); + goto err; + } + + /* Finally wrap/unwrap the key */ + + if (en_de) + { + + if (!kek_wrap_key(NULL, &keylen, ec->key, ec->keylen, &kekctx)) + goto err; + + key = OPENSSL_malloc(keylen); + + if (!key) + goto err; + + if (!kek_wrap_key(key, &keylen, ec->key, ec->keylen, &kekctx)) + goto err; + pwri->encryptedKey->data = key; + pwri->encryptedKey->length = keylen; + } + else + { + key = OPENSSL_malloc(pwri->encryptedKey->length); + + if (!key) + { + CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, + ERR_R_MALLOC_FAILURE); + goto err; + } + if (!kek_unwrap_key(key, &keylen, + pwri->encryptedKey->data, + pwri->encryptedKey->length, &kekctx)) + { + CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, + CMS_R_UNWRAP_FAILURE); + goto err; + } + + ec->key = key; + ec->keylen = keylen; + + } + + r = 1; + + err: + + EVP_CIPHER_CTX_cleanup(&kekctx); + + if (!r && key) + OPENSSL_free(key); + X509_ALGOR_free(kekalg); + + return r; + + } |