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- /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * 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 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 acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS 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 AUTHOR OR 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.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.] */
-
- #include <openssl/cipher.h>
-
- #include <assert.h>
- #include <string.h>
-
- #include <openssl/err.h>
- #include <openssl/mem.h>
- #include <openssl/obj.h>
-
- #include "internal.h"
-
-
- const EVP_CIPHER *EVP_get_cipherbynid(int nid) {
- switch (nid) {
- case NID_des_ede3_cbc:
- return EVP_des_ede3_cbc();
- case NID_des_ede_cbc:
- return EVP_des_cbc();
- case NID_aes_128_cbc:
- return EVP_aes_128_cbc();
- case NID_aes_256_cbc:
- return EVP_aes_256_cbc();
- default:
- return NULL;
- }
- }
-
- void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) {
- memset(ctx, 0, sizeof(EVP_CIPHER_CTX));
- }
-
- EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) {
- EVP_CIPHER_CTX *ctx = OPENSSL_malloc(sizeof(EVP_CIPHER_CTX));
- if (ctx) {
- EVP_CIPHER_CTX_init(ctx);
- }
- return ctx;
- }
-
- int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) {
- if (c->cipher != NULL) {
- if (c->cipher->cleanup) {
- c->cipher->cleanup(c);
- }
- OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
- }
- OPENSSL_free(c->cipher_data);
-
- memset(c, 0, sizeof(EVP_CIPHER_CTX));
- return 1;
- }
-
- void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) {
- if (ctx) {
- EVP_CIPHER_CTX_cleanup(ctx);
- OPENSSL_free(ctx);
- }
- }
-
- int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) {
- if (in == NULL || in->cipher == NULL) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_INPUT_NOT_INITIALIZED);
- return 0;
- }
-
- EVP_CIPHER_CTX_cleanup(out);
- memcpy(out, in, sizeof(EVP_CIPHER_CTX));
-
- if (in->cipher_data && in->cipher->ctx_size) {
- out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
- if (!out->cipher_data) {
- OPENSSL_PUT_ERROR(CIPHER, ERR_R_MALLOC_FAILURE);
- return 0;
- }
- memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
- }
-
- if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) {
- return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out);
- }
-
- return 1;
- }
-
- int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
- ENGINE *engine, const uint8_t *key, const uint8_t *iv,
- int enc) {
- if (enc == -1) {
- enc = ctx->encrypt;
- } else {
- if (enc) {
- enc = 1;
- }
- ctx->encrypt = enc;
- }
-
- if (cipher) {
- /* Ensure a context left from last time is cleared (the previous check
- * attempted to avoid this if the same ENGINE and EVP_CIPHER could be
- * used). */
- if (ctx->cipher) {
- EVP_CIPHER_CTX_cleanup(ctx);
- /* Restore encrypt and flags */
- ctx->encrypt = enc;
- }
-
- ctx->cipher = cipher;
- if (ctx->cipher->ctx_size) {
- ctx->cipher_data = OPENSSL_malloc(ctx->cipher->ctx_size);
- if (!ctx->cipher_data) {
- ctx->cipher = NULL;
- OPENSSL_PUT_ERROR(CIPHER, ERR_R_MALLOC_FAILURE);
- return 0;
- }
- } else {
- ctx->cipher_data = NULL;
- }
-
- ctx->key_len = cipher->key_len;
- ctx->flags = 0;
-
- if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
- if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
- ctx->cipher = NULL;
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_INITIALIZATION_ERROR);
- return 0;
- }
- }
- } else if (!ctx->cipher) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_NO_CIPHER_SET);
- return 0;
- }
-
- /* we assume block size is a power of 2 in *cryptUpdate */
- assert(ctx->cipher->block_size == 1 || ctx->cipher->block_size == 8 ||
- ctx->cipher->block_size == 16);
-
- if (!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
- switch (EVP_CIPHER_CTX_mode(ctx)) {
- case EVP_CIPH_STREAM_CIPHER:
- case EVP_CIPH_ECB_MODE:
- break;
-
- case EVP_CIPH_CFB_MODE:
- ctx->num = 0;
- /* fall-through */
-
- case EVP_CIPH_CBC_MODE:
- assert(EVP_CIPHER_CTX_iv_length(ctx) <= sizeof(ctx->iv));
- if (iv) {
- memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
- }
- memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
- break;
-
- case EVP_CIPH_CTR_MODE:
- case EVP_CIPH_OFB_MODE:
- ctx->num = 0;
- /* Don't reuse IV for CTR mode */
- if (iv) {
- memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
- }
- break;
-
- default:
- return 0;
- }
- }
-
- if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
- if (!ctx->cipher->init(ctx, key, iv, enc)) {
- return 0;
- }
- }
-
- ctx->buf_len = 0;
- ctx->final_used = 0;
- ctx->block_mask = ctx->cipher->block_size - 1;
- return 1;
- }
-
- int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
- ENGINE *impl, const uint8_t *key, const uint8_t *iv) {
- return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
- }
-
- int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
- ENGINE *impl, const uint8_t *key, const uint8_t *iv) {
- return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
- }
-
- int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len,
- const uint8_t *in, int in_len) {
- int i, j, bl;
-
- if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
- i = ctx->cipher->cipher(ctx, out, in, in_len);
- if (i < 0) {
- return 0;
- } else {
- *out_len = i;
- }
- return 1;
- }
-
- if (in_len <= 0) {
- *out_len = 0;
- return in_len == 0;
- }
-
- if (ctx->buf_len == 0 && (in_len & ctx->block_mask) == 0) {
- if (ctx->cipher->cipher(ctx, out, in, in_len)) {
- *out_len = in_len;
- return 1;
- } else {
- *out_len = 0;
- return 0;
- }
- }
-
- i = ctx->buf_len;
- bl = ctx->cipher->block_size;
- assert(bl <= (int)sizeof(ctx->buf));
- if (i != 0) {
- if (i + in_len < bl) {
- memcpy(&ctx->buf[i], in, in_len);
- ctx->buf_len += in_len;
- *out_len = 0;
- return 1;
- } else {
- j = bl - i;
- memcpy(&ctx->buf[i], in, j);
- if (!ctx->cipher->cipher(ctx, out, ctx->buf, bl)) {
- return 0;
- }
- in_len -= j;
- in += j;
- out += bl;
- *out_len = bl;
- }
- } else {
- *out_len = 0;
- }
-
- i = in_len & ctx->block_mask;
- in_len -= i;
- if (in_len > 0) {
- if (!ctx->cipher->cipher(ctx, out, in, in_len)) {
- return 0;
- }
- *out_len += in_len;
- }
-
- if (i != 0) {
- memcpy(ctx->buf, &in[in_len], i);
- }
- ctx->buf_len = i;
- return 1;
- }
-
- int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len) {
- int n, ret;
- unsigned int i, b, bl;
-
- if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
- ret = ctx->cipher->cipher(ctx, out, NULL, 0);
- if (ret < 0) {
- return 0;
- } else {
- *out_len = ret;
- }
- return 1;
- }
-
- b = ctx->cipher->block_size;
- assert(b <= sizeof(ctx->buf));
- if (b == 1) {
- *out_len = 0;
- return 1;
- }
-
- bl = ctx->buf_len;
- if (ctx->flags & EVP_CIPH_NO_PADDING) {
- if (bl) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
- return 0;
- }
- *out_len = 0;
- return 1;
- }
-
- n = b - bl;
- for (i = bl; i < b; i++) {
- ctx->buf[i] = n;
- }
- ret = ctx->cipher->cipher(ctx, out, ctx->buf, b);
-
- if (ret) {
- *out_len = b;
- }
-
- return ret;
- }
-
- int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len,
- const uint8_t *in, int in_len) {
- int fix_len;
- unsigned int b;
-
- if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
- int r = ctx->cipher->cipher(ctx, out, in, in_len);
- if (r < 0) {
- *out_len = 0;
- return 0;
- } else {
- *out_len = r;
- }
- return 1;
- }
-
- if (in_len <= 0) {
- *out_len = 0;
- return in_len == 0;
- }
-
- if (ctx->flags & EVP_CIPH_NO_PADDING) {
- return EVP_EncryptUpdate(ctx, out, out_len, in, in_len);
- }
-
- b = ctx->cipher->block_size;
- assert(b <= sizeof(ctx->final));
-
- if (ctx->final_used) {
- memcpy(out, ctx->final, b);
- out += b;
- fix_len = 1;
- } else {
- fix_len = 0;
- }
-
- if (!EVP_EncryptUpdate(ctx, out, out_len, in, in_len)) {
- return 0;
- }
-
- /* if we have 'decrypted' a multiple of block size, make sure
- * we have a copy of this last block */
- if (b > 1 && !ctx->buf_len) {
- *out_len -= b;
- ctx->final_used = 1;
- memcpy(ctx->final, &out[*out_len], b);
- } else {
- ctx->final_used = 0;
- }
-
- if (fix_len) {
- *out_len += b;
- }
-
- return 1;
- }
-
- int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *out_len) {
- int i, n;
- unsigned int b;
- *out_len = 0;
-
- if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
- i = ctx->cipher->cipher(ctx, out, NULL, 0);
- if (i < 0) {
- return 0;
- } else {
- *out_len = i;
- }
- return 1;
- }
-
- b = ctx->cipher->block_size;
- if (ctx->flags & EVP_CIPH_NO_PADDING) {
- if (ctx->buf_len) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
- return 0;
- }
- *out_len = 0;
- return 1;
- }
-
- if (b > 1) {
- if (ctx->buf_len || !ctx->final_used) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_WRONG_FINAL_BLOCK_LENGTH);
- return 0;
- }
- assert(b <= sizeof(ctx->final));
-
- /* The following assumes that the ciphertext has been authenticated.
- * Otherwise it provides a padding oracle. */
- n = ctx->final[b - 1];
- if (n == 0 || n > (int)b) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT);
- return 0;
- }
-
- for (i = 0; i < n; i++) {
- if (ctx->final[--b] != n) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT);
- return 0;
- }
- }
-
- n = ctx->cipher->block_size - n;
- for (i = 0; i < n; i++) {
- out[i] = ctx->final[i];
- }
- *out_len = n;
- } else {
- *out_len = 0;
- }
-
- return 1;
- }
-
- int EVP_Cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in,
- size_t in_len) {
- return ctx->cipher->cipher(ctx, out, in, in_len);
- }
-
- int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len,
- const uint8_t *in, int in_len) {
- if (ctx->encrypt) {
- return EVP_EncryptUpdate(ctx, out, out_len, in, in_len);
- } else {
- return EVP_DecryptUpdate(ctx, out, out_len, in, in_len);
- }
- }
-
- int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len) {
- if (ctx->encrypt) {
- return EVP_EncryptFinal_ex(ctx, out, out_len);
- } else {
- return EVP_DecryptFinal_ex(ctx, out, out_len);
- }
- }
-
- const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx) {
- return ctx->cipher;
- }
-
- int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx) {
- return ctx->cipher->nid;
- }
-
- unsigned EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx) {
- return ctx->cipher->block_size;
- }
-
- unsigned EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx) {
- return ctx->key_len;
- }
-
- unsigned EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx) {
- return ctx->cipher->iv_len;
- }
-
- void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx) {
- return ctx->app_data;
- }
-
- void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data) {
- ctx->app_data = data;
- }
-
- uint32_t EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx) {
- return ctx->cipher->flags & ~EVP_CIPH_MODE_MASK;
- }
-
- uint32_t EVP_CIPHER_CTX_mode(const EVP_CIPHER_CTX *ctx) {
- return ctx->cipher->flags & EVP_CIPH_MODE_MASK;
- }
-
- int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int command, int arg, void *ptr) {
- int ret;
- if (!ctx->cipher) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_NO_CIPHER_SET);
- return 0;
- }
-
- if (!ctx->cipher->ctrl) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_CTRL_NOT_IMPLEMENTED);
- return 0;
- }
-
- ret = ctx->cipher->ctrl(ctx, command, arg, ptr);
- if (ret == -1) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_CTRL_OPERATION_NOT_IMPLEMENTED);
- return 0;
- }
-
- return ret;
- }
-
- int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) {
- if (pad) {
- ctx->flags &= ~EVP_CIPH_NO_PADDING;
- } else {
- ctx->flags |= EVP_CIPH_NO_PADDING;
- }
- return 1;
- }
-
- int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, unsigned key_len) {
- if (c->key_len == key_len) {
- return 1;
- }
-
- if (key_len == 0 || !(c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_INVALID_KEY_LENGTH);
- return 0;
- }
-
- c->key_len = key_len;
- return 1;
- }
-
- int EVP_CIPHER_nid(const EVP_CIPHER *cipher) { return cipher->nid; }
-
- unsigned EVP_CIPHER_block_size(const EVP_CIPHER *cipher) {
- return cipher->block_size;
- }
-
- unsigned EVP_CIPHER_key_length(const EVP_CIPHER *cipher) {
- return cipher->key_len;
- }
-
- unsigned EVP_CIPHER_iv_length(const EVP_CIPHER *cipher) {
- return cipher->iv_len;
- }
-
- uint32_t EVP_CIPHER_flags(const EVP_CIPHER *cipher) {
- return cipher->flags & ~EVP_CIPH_MODE_MASK;
- }
-
- uint32_t EVP_CIPHER_mode(const EVP_CIPHER *cipher) {
- return cipher->flags & EVP_CIPH_MODE_MASK;
- }
-
- int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
- const uint8_t *key, const uint8_t *iv, int enc) {
- if (cipher) {
- EVP_CIPHER_CTX_init(ctx);
- }
- return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
- }
-
- int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
- const uint8_t *key, const uint8_t *iv) {
- return EVP_CipherInit(ctx, cipher, key, iv, 1);
- }
-
- int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
- const uint8_t *key, const uint8_t *iv) {
- return EVP_CipherInit(ctx, cipher, key, iv, 0);
- }
-
- int EVP_add_cipher_alias(const char *a, const char *b) {
- return 1;
- }
-
- const EVP_CIPHER *EVP_get_cipherbyname(const char *name) {
- if (OPENSSL_strcasecmp(name, "rc4") == 0) {
- return EVP_rc4();
- } else if (OPENSSL_strcasecmp(name, "des-cbc") == 0) {
- return EVP_des_cbc();
- } else if (OPENSSL_strcasecmp(name, "des-ede3-cbc") == 0 ||
- OPENSSL_strcasecmp(name, "3des") == 0) {
- return EVP_des_ede3_cbc();
- } else if (OPENSSL_strcasecmp(name, "aes-128-cbc") == 0) {
- return EVP_aes_128_cbc();
- } else if (OPENSSL_strcasecmp(name, "aes-256-cbc") == 0) {
- return EVP_aes_256_cbc();
- } else if (OPENSSL_strcasecmp(name, "aes-128-ctr") == 0) {
- return EVP_aes_128_ctr();
- } else if (OPENSSL_strcasecmp(name, "aes-256-ctr") == 0) {
- return EVP_aes_256_ctr();
- } else if (OPENSSL_strcasecmp(name, "aes-128-ecb") == 0) {
- return EVP_aes_128_ecb();
- } else if (OPENSSL_strcasecmp(name, "aes-256-ecb") == 0) {
- return EVP_aes_256_ecb();
- }
-
- return NULL;
- }
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