| /* 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 <string.h> |
| #include <assert.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_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
| const unsigned char *key, const unsigned char *iv, int enc) { |
| if (cipher) { |
| EVP_CIPHER_CTX_init(ctx); |
| } |
| return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc); |
| } |
| |
| int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) { |
| if (c->cipher != NULL && c->cipher->cleanup && !c->cipher->cleanup(c)) { |
| return 0; |
| } |
| |
| if (c->cipher_data) { |
| 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, EVP_CIPHER_CTX_copy, 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, EVP_CIPHER_CTX_copy, 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) { |
| OPENSSL_PUT_ERROR(CIPHER, EVP_CipherInit_ex, 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)) { |
| OPENSSL_PUT_ERROR(CIPHER, EVP_CipherInit_ex, CIPHER_R_INITIALIZATION_ERROR); |
| return 0; |
| } |
| } |
| } else if (!ctx->cipher) { |
| OPENSSL_PUT_ERROR(CIPHER, EVP_CipherInit_ex, 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: |
| case EVP_CIPH_OFB_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: |
| 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, EVP_EncryptFinal_ex, |
| 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, EVP_DecryptFinal_ex, |
| 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, EVP_DecryptFinal_ex, |
| 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, EVP_DecryptFinal_ex, CIPHER_R_BAD_DECRYPT); |
| return 0; |
| } |
| |
| for (i = 0; i < n; i++) { |
| if (ctx->final[--b] != n) { |
| OPENSSL_PUT_ERROR(CIPHER, EVP_DecryptFinal_ex, 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, EVP_CIPHER_CTX_ctrl, CIPHER_R_NO_CIPHER_SET); |
| return 0; |
| } |
| |
| if (!ctx->cipher->ctrl) { |
| OPENSSL_PUT_ERROR(CIPHER, EVP_CIPHER_CTX_ctrl, CIPHER_R_CTRL_NOT_IMPLEMENTED); |
| return 0; |
| } |
| |
| ret = ctx->cipher->ctrl(ctx, command, arg, ptr); |
| if (ret == -1) { |
| OPENSSL_PUT_ERROR(CIPHER, EVP_CIPHER_CTX_ctrl, |
| 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_nid(const EVP_CIPHER *cipher) { return cipher->nid; } |
| |
| const char *EVP_CIPHER_name(const EVP_CIPHER *cipher) { |
| return OBJ_nid2sn(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; |
| } |