| 1 | /*
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| 2 | * Copyright 1995-2022 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include "internal/provider.h"
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| 13 | #include <openssl/rand.h>
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| 14 | #include <openssl/rsa.h>
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| 15 | #include <openssl/evp.h>
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| 16 | #include <openssl/objects.h>
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| 17 | #include <openssl/x509.h>
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| 18 |
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| 19 | int EVP_SealInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
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| 20 | unsigned char **ek, int *ekl, unsigned char *iv,
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| 21 | EVP_PKEY **pubk, int npubk)
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| 22 | {
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| 23 | unsigned char key[EVP_MAX_KEY_LENGTH];
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| 24 | const OSSL_PROVIDER *prov;
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| 25 | OSSL_LIB_CTX *libctx = NULL;
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| 26 | EVP_PKEY_CTX *pctx = NULL;
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| 27 | const EVP_CIPHER *cipher;
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| 28 | int i, len;
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| 29 | int rv = 0;
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| 30 |
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| 31 | if (type != NULL) {
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| 32 | EVP_CIPHER_CTX_reset(ctx);
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| 33 | if (!EVP_EncryptInit_ex(ctx, type, NULL, NULL, NULL))
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| 34 | return 0;
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| 35 | }
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| 36 | if ((cipher = EVP_CIPHER_CTX_get0_cipher(ctx)) != NULL
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| 37 | && (prov = EVP_CIPHER_get0_provider(cipher)) != NULL)
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| 38 | libctx = ossl_provider_libctx(prov);
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| 39 | if ((npubk <= 0) || !pubk)
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| 40 | return 1;
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| 41 |
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| 42 | if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
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| 43 | return 0;
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| 44 |
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| 45 | len = EVP_CIPHER_CTX_get_iv_length(ctx);
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| 46 | if (len < 0 || RAND_priv_bytes_ex(libctx, iv, len, 0) <= 0)
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| 47 | goto err;
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| 48 |
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| 49 | len = EVP_CIPHER_CTX_get_key_length(ctx);
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| 50 | if (len < 0)
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| 51 | goto err;
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| 52 |
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| 53 | if (!EVP_EncryptInit_ex(ctx, NULL, NULL, key, iv))
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| 54 | goto err;
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| 55 |
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| 56 | for (i = 0; i < npubk; i++) {
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| 57 | size_t keylen = len;
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| 58 |
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| 59 | pctx = EVP_PKEY_CTX_new_from_pkey(libctx, pubk[i], NULL);
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| 60 | if (pctx == NULL) {
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| 61 | ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
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| 62 | goto err;
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| 63 | }
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| 64 |
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| 65 | if (EVP_PKEY_encrypt_init(pctx) <= 0
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| 66 | || EVP_PKEY_encrypt(pctx, ek[i], &keylen, key, keylen) <= 0)
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| 67 | goto err;
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| 68 | ekl[i] = (int)keylen;
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| 69 | EVP_PKEY_CTX_free(pctx);
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| 70 | }
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| 71 | pctx = NULL;
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| 72 | rv = npubk;
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| 73 | err:
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| 74 | EVP_PKEY_CTX_free(pctx);
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| 75 | OPENSSL_cleanse(key, sizeof(key));
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| 76 | return rv;
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| 77 | }
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| 78 |
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| 79 | int EVP_SealFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
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| 80 | {
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| 81 | int i;
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| 82 | i = EVP_EncryptFinal_ex(ctx, out, outl);
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| 83 | if (i)
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| 84 | i = EVP_EncryptInit_ex(ctx, NULL, NULL, NULL, NULL);
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| 85 | return i;
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| 86 | }
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