--- /dev/null
+/* 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/nid.h>
+
+#include "internal.h"
+#include "../../internal.h"
+
+
+void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) {
+ OPENSSL_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 && c->cipher->cleanup) {
+ c->cipher->cleanup(c);
+ }
+ OPENSSL_free(c->cipher_data);
+
+ OPENSSL_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);
+ OPENSSL_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) {
+ out->cipher = NULL;
+ OPENSSL_PUT_ERROR(CIPHER, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ OPENSSL_memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
+ }
+
+ if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) {
+ if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
+ out->cipher = NULL;
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+void EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *ctx) {
+ EVP_CIPHER_CTX_cleanup(ctx);
+ EVP_CIPHER_CTX_init(ctx);
+}
+
+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) {
+ OPENSSL_memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
+ }
+ OPENSSL_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) {
+ OPENSSL_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 (bl - i > in_len) {
+ OPENSSL_memcpy(&ctx->buf[i], in, in_len);
+ ctx->buf_len += in_len;
+ *out_len = 0;
+ return 1;
+ } else {
+ j = bl - i;
+ OPENSSL_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) {
+ OPENSSL_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) {
+ OPENSSL_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;
+ OPENSSL_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;
+}
+
+void EVP_CIPHER_CTX_set_flags(const EVP_CIPHER_CTX *ctx, uint32_t flags) {}
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