diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/cms/cms_kari.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/cms/cms_kari.c | 411 |
1 files changed, 411 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/cms/cms_kari.c b/openssl-1.1.0h/crypto/cms/cms_kari.c new file mode 100644 index 0000000..3bc46fe --- /dev/null +++ b/openssl-1.1.0h/crypto/cms/cms_kari.c @@ -0,0 +1,411 @@ +/* + * Copyright 2013-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include "internal/cryptlib.h" +#include <openssl/asn1t.h> +#include <openssl/pem.h> +#include <openssl/x509v3.h> +#include <openssl/err.h> +#include <openssl/cms.h> +#include <openssl/aes.h> +#include "cms_lcl.h" +#include "internal/asn1_int.h" + +/* Key Agreement Recipient Info (KARI) routines */ + +int CMS_RecipientInfo_kari_get0_alg(CMS_RecipientInfo *ri, + X509_ALGOR **palg, + ASN1_OCTET_STRING **pukm) +{ + if (ri->type != CMS_RECIPINFO_AGREE) { + CMSerr(CMS_F_CMS_RECIPIENTINFO_KARI_GET0_ALG, + CMS_R_NOT_KEY_AGREEMENT); + return 0; + } + if (palg) + *palg = ri->d.kari->keyEncryptionAlgorithm; + if (pukm) + *pukm = ri->d.kari->ukm; + return 1; +} + +/* Retrieve recipient encrypted keys from a kari */ + +STACK_OF(CMS_RecipientEncryptedKey) +*CMS_RecipientInfo_kari_get0_reks(CMS_RecipientInfo *ri) +{ + if (ri->type != CMS_RECIPINFO_AGREE) { + CMSerr(CMS_F_CMS_RECIPIENTINFO_KARI_GET0_REKS, + CMS_R_NOT_KEY_AGREEMENT); + return NULL; + } + return ri->d.kari->recipientEncryptedKeys; +} + +int CMS_RecipientInfo_kari_get0_orig_id(CMS_RecipientInfo *ri, + X509_ALGOR **pubalg, + ASN1_BIT_STRING **pubkey, + ASN1_OCTET_STRING **keyid, + X509_NAME **issuer, + ASN1_INTEGER **sno) +{ + CMS_OriginatorIdentifierOrKey *oik; + if (ri->type != CMS_RECIPINFO_AGREE) { + CMSerr(CMS_F_CMS_RECIPIENTINFO_KARI_GET0_ORIG_ID, + CMS_R_NOT_KEY_AGREEMENT); + return 0; + } + oik = ri->d.kari->originator; + if (issuer) + *issuer = NULL; + if (sno) + *sno = NULL; + if (keyid) + *keyid = NULL; + if (pubalg) + *pubalg = NULL; + if (pubkey) + *pubkey = NULL; + if (oik->type == CMS_OIK_ISSUER_SERIAL) { + if (issuer) + *issuer = oik->d.issuerAndSerialNumber->issuer; + if (sno) + *sno = oik->d.issuerAndSerialNumber->serialNumber; + } else if (oik->type == CMS_OIK_KEYIDENTIFIER) { + if (keyid) + *keyid = oik->d.subjectKeyIdentifier; + } else if (oik->type == CMS_OIK_PUBKEY) { + if (pubalg) + *pubalg = oik->d.originatorKey->algorithm; + if (pubkey) + *pubkey = oik->d.originatorKey->publicKey; + } else + return 0; + return 1; +} + +int CMS_RecipientInfo_kari_orig_id_cmp(CMS_RecipientInfo *ri, X509 *cert) +{ + CMS_OriginatorIdentifierOrKey *oik; + if (ri->type != CMS_RECIPINFO_AGREE) { + CMSerr(CMS_F_CMS_RECIPIENTINFO_KARI_ORIG_ID_CMP, + CMS_R_NOT_KEY_AGREEMENT); + return -2; + } + oik = ri->d.kari->originator; + if (oik->type == CMS_OIK_ISSUER_SERIAL) + return cms_ias_cert_cmp(oik->d.issuerAndSerialNumber, cert); + else if (oik->type == CMS_OIK_KEYIDENTIFIER) + return cms_keyid_cert_cmp(oik->d.subjectKeyIdentifier, cert); + return -1; +} + +int CMS_RecipientEncryptedKey_get0_id(CMS_RecipientEncryptedKey *rek, + ASN1_OCTET_STRING **keyid, + ASN1_GENERALIZEDTIME **tm, + CMS_OtherKeyAttribute **other, + X509_NAME **issuer, ASN1_INTEGER **sno) +{ + CMS_KeyAgreeRecipientIdentifier *rid = rek->rid; + if (rid->type == CMS_REK_ISSUER_SERIAL) { + if (issuer) + *issuer = rid->d.issuerAndSerialNumber->issuer; + if (sno) + *sno = rid->d.issuerAndSerialNumber->serialNumber; + if (keyid) + *keyid = NULL; + if (tm) + *tm = NULL; + if (other) + *other = NULL; + } else if (rid->type == CMS_REK_KEYIDENTIFIER) { + if (keyid) + *keyid = rid->d.rKeyId->subjectKeyIdentifier; + if (tm) + *tm = rid->d.rKeyId->date; + if (other) + *other = rid->d.rKeyId->other; + if (issuer) + *issuer = NULL; + if (sno) + *sno = NULL; + } else + return 0; + return 1; +} + +int CMS_RecipientEncryptedKey_cert_cmp(CMS_RecipientEncryptedKey *rek, + X509 *cert) +{ + CMS_KeyAgreeRecipientIdentifier *rid = rek->rid; + if (rid->type == CMS_REK_ISSUER_SERIAL) + return cms_ias_cert_cmp(rid->d.issuerAndSerialNumber, cert); + else if (rid->type == CMS_REK_KEYIDENTIFIER) + return cms_keyid_cert_cmp(rid->d.rKeyId->subjectKeyIdentifier, cert); + else + return -1; +} + +int CMS_RecipientInfo_kari_set0_pkey(CMS_RecipientInfo *ri, EVP_PKEY *pk) +{ + EVP_PKEY_CTX *pctx; + CMS_KeyAgreeRecipientInfo *kari = ri->d.kari; + + EVP_PKEY_CTX_free(kari->pctx); + kari->pctx = NULL; + if (!pk) + return 1; + pctx = EVP_PKEY_CTX_new(pk, NULL); + if (!pctx || !EVP_PKEY_derive_init(pctx)) + goto err; + kari->pctx = pctx; + return 1; + err: + EVP_PKEY_CTX_free(pctx); + return 0; +} + +EVP_CIPHER_CTX *CMS_RecipientInfo_kari_get0_ctx(CMS_RecipientInfo *ri) +{ + if (ri->type == CMS_RECIPINFO_AGREE) + return ri->d.kari->ctx; + return NULL; +} + +/* + * Derive KEK and decrypt/encrypt with it to produce either the original CEK + * or the encrypted CEK. + */ + +static int cms_kek_cipher(unsigned char **pout, size_t *poutlen, + const unsigned char *in, size_t inlen, + CMS_KeyAgreeRecipientInfo *kari, int enc) +{ + /* Key encryption key */ + unsigned char kek[EVP_MAX_KEY_LENGTH]; + size_t keklen; + int rv = 0; + unsigned char *out = NULL; + int outlen; + keklen = EVP_CIPHER_CTX_key_length(kari->ctx); + if (keklen > EVP_MAX_KEY_LENGTH) + return 0; + /* Derive KEK */ + if (EVP_PKEY_derive(kari->pctx, kek, &keklen) <= 0) + goto err; + /* Set KEK in context */ + if (!EVP_CipherInit_ex(kari->ctx, NULL, NULL, kek, NULL, enc)) + goto err; + /* obtain output length of ciphered key */ + if (!EVP_CipherUpdate(kari->ctx, NULL, &outlen, in, inlen)) + goto err; + out = OPENSSL_malloc(outlen); + if (out == NULL) + goto err; + if (!EVP_CipherUpdate(kari->ctx, out, &outlen, in, inlen)) + goto err; + *pout = out; + *poutlen = (size_t)outlen; + rv = 1; + + err: + OPENSSL_cleanse(kek, keklen); + if (!rv) + OPENSSL_free(out); + EVP_CIPHER_CTX_reset(kari->ctx); + /* FIXME: WHY IS kari->pctx freed here? /RL */ + EVP_PKEY_CTX_free(kari->pctx); + kari->pctx = NULL; + return rv; +} + +int CMS_RecipientInfo_kari_decrypt(CMS_ContentInfo *cms, + CMS_RecipientInfo *ri, + CMS_RecipientEncryptedKey *rek) +{ + int rv = 0; + unsigned char *enckey = NULL, *cek = NULL; + size_t enckeylen; + size_t ceklen; + CMS_EncryptedContentInfo *ec; + enckeylen = rek->encryptedKey->length; + enckey = rek->encryptedKey->data; + /* Setup all parameters to derive KEK */ + if (!cms_env_asn1_ctrl(ri, 1)) + goto err; + /* Attempt to decrypt CEK */ + if (!cms_kek_cipher(&cek, &ceklen, enckey, enckeylen, ri->d.kari, 0)) + goto err; + ec = cms->d.envelopedData->encryptedContentInfo; + OPENSSL_clear_free(ec->key, ec->keylen); + ec->key = cek; + ec->keylen = ceklen; + cek = NULL; + rv = 1; + err: + OPENSSL_free(cek); + return rv; +} + +/* Create ephemeral key and initialise context based on it */ +static int cms_kari_create_ephemeral_key(CMS_KeyAgreeRecipientInfo *kari, + EVP_PKEY *pk) +{ + EVP_PKEY_CTX *pctx = NULL; + EVP_PKEY *ekey = NULL; + int rv = 0; + pctx = EVP_PKEY_CTX_new(pk, NULL); + if (!pctx) + goto err; + if (EVP_PKEY_keygen_init(pctx) <= 0) + goto err; + if (EVP_PKEY_keygen(pctx, &ekey) <= 0) + goto err; + EVP_PKEY_CTX_free(pctx); + pctx = EVP_PKEY_CTX_new(ekey, NULL); + if (!pctx) + goto err; + if (EVP_PKEY_derive_init(pctx) <= 0) + goto err; + kari->pctx = pctx; + rv = 1; + err: + if (!rv) + EVP_PKEY_CTX_free(pctx); + EVP_PKEY_free(ekey); + return rv; +} + +/* Initialise a ktri based on passed certificate and key */ + +int cms_RecipientInfo_kari_init(CMS_RecipientInfo *ri, X509 *recip, + EVP_PKEY *pk, unsigned int flags) +{ + CMS_KeyAgreeRecipientInfo *kari; + CMS_RecipientEncryptedKey *rek = NULL; + + ri->d.kari = M_ASN1_new_of(CMS_KeyAgreeRecipientInfo); + if (!ri->d.kari) + return 0; + ri->type = CMS_RECIPINFO_AGREE; + + kari = ri->d.kari; + kari->version = 3; + + rek = M_ASN1_new_of(CMS_RecipientEncryptedKey); + if (!sk_CMS_RecipientEncryptedKey_push(kari->recipientEncryptedKeys, rek)) { + M_ASN1_free_of(rek, CMS_RecipientEncryptedKey); + return 0; + } + + if (flags & CMS_USE_KEYID) { + rek->rid->type = CMS_REK_KEYIDENTIFIER; + rek->rid->d.rKeyId = M_ASN1_new_of(CMS_RecipientKeyIdentifier); + if (rek->rid->d.rKeyId == NULL) + return 0; + if (!cms_set1_keyid(&rek->rid->d.rKeyId->subjectKeyIdentifier, recip)) + return 0; + } else { + rek->rid->type = CMS_REK_ISSUER_SERIAL; + if (!cms_set1_ias(&rek->rid->d.issuerAndSerialNumber, recip)) + return 0; + } + + /* Create ephemeral key */ + if (!cms_kari_create_ephemeral_key(kari, pk)) + return 0; + + EVP_PKEY_up_ref(pk); + rek->pkey = pk; + return 1; +} + +static int cms_wrap_init(CMS_KeyAgreeRecipientInfo *kari, + const EVP_CIPHER *cipher) +{ + EVP_CIPHER_CTX *ctx = kari->ctx; + const EVP_CIPHER *kekcipher; + int keylen = EVP_CIPHER_key_length(cipher); + /* If a suitable wrap algorithm is already set nothing to do */ + kekcipher = EVP_CIPHER_CTX_cipher(ctx); + + if (kekcipher) { + if (EVP_CIPHER_CTX_mode(ctx) != EVP_CIPH_WRAP_MODE) + return 0; + return 1; + } + /* + * Pick a cipher based on content encryption cipher. If it is DES3 use + * DES3 wrap otherwise use AES wrap similar to key size. + */ +#ifndef OPENSSL_NO_DES + if (EVP_CIPHER_type(cipher) == NID_des_ede3_cbc) + kekcipher = EVP_des_ede3_wrap(); + else +#endif + if (keylen <= 16) + kekcipher = EVP_aes_128_wrap(); + else if (keylen <= 24) + kekcipher = EVP_aes_192_wrap(); + else + kekcipher = EVP_aes_256_wrap(); + return EVP_EncryptInit_ex(ctx, kekcipher, NULL, NULL, NULL); +} + +/* Encrypt content key in key agreement recipient info */ + +int cms_RecipientInfo_kari_encrypt(CMS_ContentInfo *cms, + CMS_RecipientInfo *ri) +{ + CMS_KeyAgreeRecipientInfo *kari; + CMS_EncryptedContentInfo *ec; + CMS_RecipientEncryptedKey *rek; + STACK_OF(CMS_RecipientEncryptedKey) *reks; + int i; + + if (ri->type != CMS_RECIPINFO_AGREE) { + CMSerr(CMS_F_CMS_RECIPIENTINFO_KARI_ENCRYPT, CMS_R_NOT_KEY_AGREEMENT); + return 0; + } + kari = ri->d.kari; + reks = kari->recipientEncryptedKeys; + ec = cms->d.envelopedData->encryptedContentInfo; + /* Initialise wrap algorithm parameters */ + if (!cms_wrap_init(kari, ec->cipher)) + return 0; + /* + * If no originator key set up initialise for ephemeral key the public key + * ASN1 structure will set the actual public key value. + */ + if (kari->originator->type == -1) { + CMS_OriginatorIdentifierOrKey *oik = kari->originator; + oik->type = CMS_OIK_PUBKEY; + oik->d.originatorKey = M_ASN1_new_of(CMS_OriginatorPublicKey); + if (!oik->d.originatorKey) + return 0; + } + /* Initialise KDF algorithm */ + if (!cms_env_asn1_ctrl(ri, 0)) + return 0; + /* For each rek, derive KEK, encrypt CEK */ + for (i = 0; i < sk_CMS_RecipientEncryptedKey_num(reks); i++) { + unsigned char *enckey; + size_t enckeylen; + rek = sk_CMS_RecipientEncryptedKey_value(reks, i); + if (EVP_PKEY_derive_set_peer(kari->pctx, rek->pkey) <= 0) + return 0; + if (!cms_kek_cipher(&enckey, &enckeylen, ec->key, ec->keylen, + kari, 1)) + return 0; + ASN1_STRING_set0(rek->encryptedKey, enckey, enckeylen); + } + + return 1; + +} |