-/* crypto/evp/bio_enc.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. 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.]
+ * 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 <stdio.h>
#include <errno.h>
-#include "cryptlib.h"
-#include "buffer.h"
-#include "evp.h"
-
-#ifndef NOPROTO
-static int enc_write(BIO *h,char *buf,int num);
-static int enc_read(BIO *h,char *buf,int size);
-/*static int enc_puts(BIO *h,char *str); */
-/*static int enc_gets(BIO *h,char *str,int size); */
-static long enc_ctrl(BIO *h,int cmd,long arg1,char *arg2);
+#include "internal/cryptlib.h"
+#include <openssl/buffer.h>
+#include <openssl/evp.h>
+#include "internal/bio.h"
+
+static int enc_write(BIO *h, const char *buf, int num);
+static int enc_read(BIO *h, char *buf, int size);
+static long enc_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int enc_new(BIO *h);
static int enc_free(BIO *data);
-#else
-static int enc_write();
-static int enc_read();
-/*static int enc_puts(); */
-/*static int enc_gets(); */
-static long enc_ctrl();
-static int enc_new();
-static int enc_free();
-#endif
-
-#define ENC_BLOCK_SIZE (1024*4)
-
-typedef struct enc_struct
- {
- int buf_len;
- int buf_off;
- int cont; /* <= 0 when finished */
- int finished;
- int ok; /* bad decrypt */
- EVP_CIPHER_CTX cipher;
- char buf[ENC_BLOCK_SIZE+10];
- } BIO_ENC_CTX;
-
-static BIO_METHOD methods_enc=
- {
- BIO_TYPE_CIPHER,"cipher",
- enc_write,
- enc_read,
- NULL, /* enc_puts, */
- NULL, /* enc_gets, */
- enc_ctrl,
- enc_new,
- enc_free,
- };
-
-BIO_METHOD *BIO_f_cipher()
- {
- return(&methods_enc);
- }
-
-static int enc_new(bi)
-BIO *bi;
- {
- BIO_ENC_CTX *ctx;
-
- ctx=(BIO_ENC_CTX *)Malloc(sizeof(BIO_ENC_CTX));
- EVP_CIPHER_CTX_init(&ctx->cipher);
- if (ctx == NULL) return(0);
-
- ctx->buf_len=0;
- ctx->buf_off=0;
- ctx->cont=1;
- ctx->finished=0;
- ctx->ok=1;
-
- bi->init=0;
- bi->ptr=(char *)ctx;
- bi->flags=0;
- return(1);
- }
-
-static int enc_free(a)
-BIO *a;
- {
- BIO_ENC_CTX *b;
-
- if (a == NULL) return(0);
- b=(BIO_ENC_CTX *)a->ptr;
- EVP_CIPHER_CTX_cleanup(&(b->cipher));
- memset(a->ptr,0,sizeof(BIO_ENC_CTX));
- Free(a->ptr);
- a->ptr=NULL;
- a->init=0;
- a->flags=0;
- return(1);
- }
-
-static int enc_read(b,out,outl)
-BIO *b;
-char *out;
-int outl;
- {
- int ret=0,i;
- BIO_ENC_CTX *ctx;
-
- if (out == NULL) return(0);
- ctx=(BIO_ENC_CTX *)b->ptr;
-
- if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
-
- /* First check if there are bytes decoded/encoded */
- if (ctx->buf_len > 0)
- {
- i=ctx->buf_len-ctx->buf_off;
- if (i > outl) i=outl;
- memcpy(out,&(ctx->buf[ctx->buf_off]),i);
- ret=i;
- out+=i;
- outl-=i;
- ctx->buf_off+=i;
- if (ctx->buf_len == ctx->buf_off)
- {
- ctx->buf_len=0;
- ctx->buf_off=0;
- }
- }
-
- /* At this point, we have room of outl bytes and an empty
- * buffer, so we should read in some more. */
-
- while (outl > 0)
- {
- if (ctx->cont <= 0) break;
-
- /* read in at offset 8, read the EVP_Cipher
- * documentation about why */
- i=BIO_read(b->next_bio,&(ctx->buf[8]),ENC_BLOCK_SIZE);
-
- if (i <= 0)
- {
- /* Should be continue next time we are called? */
- if (!BIO_should_retry(b->next_bio))
- {
- ctx->cont=i;
- i=EVP_CipherFinal(&(ctx->cipher),
- (unsigned char *)ctx->buf,
- &(ctx->buf_len));
- ctx->ok=i;
- ctx->buf_off=0;
- }
- else
- ret=(ret == 0)?i:ret;
- break;
- }
- else
- {
- EVP_CipherUpdate(&(ctx->cipher),
- (unsigned char *)ctx->buf,&ctx->buf_len,
- (unsigned char *)&(ctx->buf[8]),i);
- ctx->cont=1;
- }
-
- if (ctx->buf_len <= outl)
- i=ctx->buf_len;
- else
- i=outl;
-
- if (i <= 0) break;
- memcpy(out,ctx->buf,i);
- ret+=i;
- ctx->buf_off=i;
- outl-=i;
- out+=i;
- }
-
- BIO_clear_retry_flags(b);
- BIO_copy_next_retry(b);
- return((ret == 0)?ctx->cont:ret);
- }
-
-static int enc_write(b,in,inl)
-BIO *b;
-char *in;
-int inl;
- {
- int ret=0,n,i;
- BIO_ENC_CTX *ctx;
-
- ctx=(BIO_ENC_CTX *)b->ptr;
- ret=inl;
-
- BIO_clear_retry_flags(b);
- n=ctx->buf_len-ctx->buf_off;
- while (n > 0)
- {
- i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
- if (i <= 0)
- {
- BIO_copy_next_retry(b);
- return(i);
- }
- ctx->buf_off+=i;
- n-=i;
- }
- /* at this point all pending data has been written */
-
- if ((in == NULL) || (inl <= 0)) return(0);
-
- ctx->buf_off=0;
- while (inl > 0)
- {
- n=(inl > ENC_BLOCK_SIZE)?ENC_BLOCK_SIZE:inl;
- EVP_CipherUpdate(&(ctx->cipher),
- (unsigned char *)ctx->buf,&ctx->buf_len,
- (unsigned char *)in,n);
- inl-=n;
- in+=n;
-
- ctx->buf_off=0;
- n=ctx->buf_len;
- while (n > 0)
- {
- i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
- if (i <= 0)
- {
- BIO_copy_next_retry(b);
- return(i);
- }
- n-=i;
- ctx->buf_off+=i;
- }
- ctx->buf_len=0;
- ctx->buf_off=0;
- }
- BIO_copy_next_retry(b);
- return(ret);
- }
-
-static long enc_ctrl(b,cmd,num,ptr)
-BIO *b;
-int cmd;
-long num;
-char *ptr;
- {
- BIO *dbio;
- BIO_ENC_CTX *ctx,*dctx;
- long ret=1;
- int i;
- EVP_CIPHER_CTX **c_ctx;
-
- ctx=(BIO_ENC_CTX *)b->ptr;
-
- switch (cmd)
- {
- case BIO_CTRL_RESET:
- ctx->ok=1;
- ctx->finished=0;
- EVP_CipherInit(&(ctx->cipher),NULL,NULL,NULL,
- ctx->cipher.encrypt);
- ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
- break;
- case BIO_CTRL_EOF: /* More to read */
- if (ctx->cont <= 0)
- ret=1;
- else
- ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
- break;
- case BIO_CTRL_WPENDING:
- ret=ctx->buf_len-ctx->buf_off;
- if (ret <= 0)
- ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
- break;
- case BIO_CTRL_PENDING: /* More to read in buffer */
- ret=ctx->buf_len-ctx->buf_off;
- if (ret <= 0)
- ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
- break;
- case BIO_CTRL_FLUSH:
- /* do a final write */
-again:
- while (ctx->buf_len != ctx->buf_off)
- {
- i=enc_write(b,NULL,0);
- if (i < 0)
- {
- ret=i;
- break;
- }
- }
-
- if (!ctx->finished)
- {
- ctx->finished=1;
- ctx->buf_off=0;
- ret=EVP_CipherFinal(&(ctx->cipher),
- (unsigned char *)ctx->buf,
- &(ctx->buf_len));
- ctx->ok=(int)ret;
- if (ret <= 0) break;
-
- /* push out the bytes */
- goto again;
- }
-
- /* Finally flush the underlying BIO */
- ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
- break;
- case BIO_C_GET_CIPHER_STATUS:
- ret=(long)ctx->ok;
- break;
- case BIO_C_DO_STATE_MACHINE:
- BIO_clear_retry_flags(b);
- ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
- BIO_copy_next_retry(b);
- break;
- case BIO_C_GET_CIPHER_CTX:
- c_ctx=(EVP_CIPHER_CTX **)ptr;
- (*c_ctx)= &(ctx->cipher);
- b->init=1;
- break;
- case BIO_CTRL_DUP:
- dbio=(BIO *)ptr;
- dctx=(BIO_ENC_CTX *)dbio->ptr;
- memcpy(&(dctx->cipher),&(ctx->cipher),sizeof(ctx->cipher));
- dbio->init=1;
- break;
- default:
- ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
- break;
- }
- return(ret);
- }
-
-/*
-void BIO_set_cipher_ctx(b,c)
-BIO *b;
-EVP_CIPHER_ctx *c;
- {
- if (b == NULL) return;
-
- if ((b->callback != NULL) &&
- (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
- return;
-
- b->init=1;
- ctx=(BIO_ENC_CTX *)b->ptr;
- memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
-
- if (b->callback != NULL)
- b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
- }
-*/
-
-void BIO_set_cipher(b,c,k,i,e)
-BIO *b;
-EVP_CIPHER *c;
-unsigned char *k;
-unsigned char *i;
-int e;
- {
- BIO_ENC_CTX *ctx;
-
- if (b == NULL) return;
-
- if ((b->callback != NULL) &&
- (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
- return;
-
- b->init=1;
- ctx=(BIO_ENC_CTX *)b->ptr;
- EVP_CipherInit(&(ctx->cipher),c,k,i,e);
-
- if (b->callback != NULL)
- b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
- }
-
+static long enc_callback_ctrl(BIO *h, int cmd, bio_info_cb *fps);
+#define ENC_BLOCK_SIZE (1024*4)
+#define ENC_MIN_CHUNK (256)
+#define BUF_OFFSET (ENC_MIN_CHUNK + EVP_MAX_BLOCK_LENGTH)
+
+typedef struct enc_struct {
+ int buf_len;
+ int buf_off;
+ int cont; /* <= 0 when finished */
+ int finished;
+ int ok; /* bad decrypt */
+ EVP_CIPHER_CTX *cipher;
+ unsigned char *read_start, *read_end;
+ /*
+ * buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate can return
+ * up to a block more data than is presented to it
+ */
+ unsigned char buf[BUF_OFFSET + ENC_BLOCK_SIZE];
+} BIO_ENC_CTX;
+
+static const BIO_METHOD methods_enc = {
+ BIO_TYPE_CIPHER, "cipher",
+ /* TODO: Convert to new style write function */
+ bwrite_conv,
+ enc_write,
+ /* TODO: Convert to new style read function */
+ bread_conv,
+ enc_read,
+ NULL, /* enc_puts, */
+ NULL, /* enc_gets, */
+ enc_ctrl,
+ enc_new,
+ enc_free,
+ enc_callback_ctrl,
+};
+
+const BIO_METHOD *BIO_f_cipher(void)
+{
+ return (&methods_enc);
+}
+
+static int enc_new(BIO *bi)
+{
+ BIO_ENC_CTX *ctx;
+
+ ctx = OPENSSL_zalloc(sizeof(*ctx));
+ if (ctx == NULL)
+ return 0;
+
+ ctx->cipher = EVP_CIPHER_CTX_new();
+ if (ctx->cipher == NULL) {
+ OPENSSL_free(ctx);
+ return 0;
+ }
+ ctx->cont = 1;
+ ctx->ok = 1;
+ ctx->read_end = ctx->read_start = &(ctx->buf[BUF_OFFSET]);
+ BIO_set_data(bi, ctx);
+ BIO_set_init(bi, 1);
+
+ return 1;
+}
+
+static int enc_free(BIO *a)
+{
+ BIO_ENC_CTX *b;
+
+ if (a == NULL)
+ return 0;
+
+ b = BIO_get_data(a);
+ if (b == NULL)
+ return 0;
+
+ EVP_CIPHER_CTX_free(b->cipher);
+ OPENSSL_clear_free(b, sizeof(BIO_ENC_CTX));
+ BIO_set_data(a, NULL);
+ BIO_set_init(a, 0);
+
+ return 1;
+}
+
+static int enc_read(BIO *b, char *out, int outl)
+{
+ int ret = 0, i, blocksize;
+ BIO_ENC_CTX *ctx;
+ BIO *next;
+
+ if (out == NULL)
+ return (0);
+ ctx = BIO_get_data(b);
+
+ next = BIO_next(b);
+ if ((ctx == NULL) || (next == NULL))
+ return 0;
+
+ /* First check if there are bytes decoded/encoded */
+ if (ctx->buf_len > 0) {
+ i = ctx->buf_len - ctx->buf_off;
+ if (i > outl)
+ i = outl;
+ memcpy(out, &(ctx->buf[ctx->buf_off]), i);
+ ret = i;
+ out += i;
+ outl -= i;
+ ctx->buf_off += i;
+ if (ctx->buf_len == ctx->buf_off) {
+ ctx->buf_len = 0;
+ ctx->buf_off = 0;
+ }
+ }
+
+ blocksize = EVP_CIPHER_CTX_block_size(ctx->cipher);
+ if (blocksize == 1)
+ blocksize = 0;
+
+ /*
+ * At this point, we have room of outl bytes and an empty buffer, so we
+ * should read in some more.
+ */
+
+ while (outl > 0) {
+ if (ctx->cont <= 0)
+ break;
+
+ if (ctx->read_start == ctx->read_end) { /* time to read more data */
+ ctx->read_end = ctx->read_start = &(ctx->buf[BUF_OFFSET]);
+ i = BIO_read(next, ctx->read_start, ENC_BLOCK_SIZE);
+ if (i > 0)
+ ctx->read_end += i;
+ } else {
+ i = ctx->read_end - ctx->read_start;
+ }
+
+ if (i <= 0) {
+ /* Should be continue next time we are called? */
+ if (!BIO_should_retry(next)) {
+ ctx->cont = i;
+ i = EVP_CipherFinal_ex(ctx->cipher,
+ ctx->buf, &(ctx->buf_len));
+ ctx->ok = i;
+ ctx->buf_off = 0;
+ } else {
+ ret = (ret == 0) ? i : ret;
+ break;
+ }
+ } else {
+ if (outl > ENC_MIN_CHUNK) {
+ /*
+ * Depending on flags block cipher decrypt can write
+ * one extra block and then back off, i.e. output buffer
+ * has to accommodate extra block...
+ */
+ int j = outl - blocksize, buf_len;
+
+ if (!EVP_CipherUpdate(ctx->cipher,
+ (unsigned char *)out, &buf_len,
+ ctx->read_start, i > j ? j : i)) {
+ BIO_clear_retry_flags(b);
+ return 0;
+ }
+ ret += buf_len;
+ out += buf_len;
+ outl -= buf_len;
+
+ if ((i -= j) <= 0) {
+ ctx->read_start = ctx->read_end;
+ continue;
+ }
+ ctx->read_start += j;
+ }
+ if (i > ENC_MIN_CHUNK)
+ i = ENC_MIN_CHUNK;
+ if (!EVP_CipherUpdate(ctx->cipher,
+ ctx->buf, &ctx->buf_len,
+ ctx->read_start, i)) {
+ BIO_clear_retry_flags(b);
+ ctx->ok = 0;
+ return 0;
+ }
+ ctx->read_start += i;
+ ctx->cont = 1;
+ /*
+ * Note: it is possible for EVP_CipherUpdate to decrypt zero
+ * bytes because this is or looks like the final block: if this
+ * happens we should retry and either read more data or decrypt
+ * the final block
+ */
+ if (ctx->buf_len == 0)
+ continue;
+ }
+
+ if (ctx->buf_len <= outl)
+ i = ctx->buf_len;
+ else
+ i = outl;
+ if (i <= 0)
+ break;
+ memcpy(out, ctx->buf, i);
+ ret += i;
+ ctx->buf_off = i;
+ outl -= i;
+ out += i;
+ }
+
+ BIO_clear_retry_flags(b);
+ BIO_copy_next_retry(b);
+ return ((ret == 0) ? ctx->cont : ret);
+}
+
+static int enc_write(BIO *b, const char *in, int inl)
+{
+ int ret = 0, n, i;
+ BIO_ENC_CTX *ctx;
+ BIO *next;
+
+ ctx = BIO_get_data(b);
+ next = BIO_next(b);
+ if ((ctx == NULL) || (next == NULL))
+ return 0;
+
+ ret = inl;
+
+ BIO_clear_retry_flags(b);
+ n = ctx->buf_len - ctx->buf_off;
+ while (n > 0) {
+ i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
+ if (i <= 0) {
+ BIO_copy_next_retry(b);
+ return (i);
+ }
+ ctx->buf_off += i;
+ n -= i;
+ }
+ /* at this point all pending data has been written */
+
+ if ((in == NULL) || (inl <= 0))
+ return (0);
+
+ ctx->buf_off = 0;
+ while (inl > 0) {
+ n = (inl > ENC_BLOCK_SIZE) ? ENC_BLOCK_SIZE : inl;
+ if (!EVP_CipherUpdate(ctx->cipher,
+ ctx->buf, &ctx->buf_len,
+ (const unsigned char *)in, n)) {
+ BIO_clear_retry_flags(b);
+ ctx->ok = 0;
+ return 0;
+ }
+ inl -= n;
+ in += n;
+
+ ctx->buf_off = 0;
+ n = ctx->buf_len;
+ while (n > 0) {
+ i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
+ if (i <= 0) {
+ BIO_copy_next_retry(b);
+ return (ret == inl) ? i : ret - inl;
+ }
+ n -= i;
+ ctx->buf_off += i;
+ }
+ ctx->buf_len = 0;
+ ctx->buf_off = 0;
+ }
+ BIO_copy_next_retry(b);
+ return (ret);
+}
+
+static long enc_ctrl(BIO *b, int cmd, long num, void *ptr)
+{
+ BIO *dbio;
+ BIO_ENC_CTX *ctx, *dctx;
+ long ret = 1;
+ int i;
+ EVP_CIPHER_CTX **c_ctx;
+ BIO *next;
+
+ ctx = BIO_get_data(b);
+ next = BIO_next(b);
+ if (ctx == NULL)
+ return 0;
+
+ switch (cmd) {
+ case BIO_CTRL_RESET:
+ ctx->ok = 1;
+ ctx->finished = 0;
+ if (!EVP_CipherInit_ex(ctx->cipher, NULL, NULL, NULL, NULL,
+ EVP_CIPHER_CTX_encrypting(ctx->cipher)))
+ return 0;
+ ret = BIO_ctrl(next, cmd, num, ptr);
+ break;
+ case BIO_CTRL_EOF: /* More to read */
+ if (ctx->cont <= 0)
+ ret = 1;
+ else
+ ret = BIO_ctrl(next, cmd, num, ptr);
+ break;
+ case BIO_CTRL_WPENDING:
+ ret = ctx->buf_len - ctx->buf_off;
+ if (ret <= 0)
+ ret = BIO_ctrl(next, cmd, num, ptr);
+ break;
+ case BIO_CTRL_PENDING: /* More to read in buffer */
+ ret = ctx->buf_len - ctx->buf_off;
+ if (ret <= 0)
+ ret = BIO_ctrl(next, cmd, num, ptr);
+ break;
+ case BIO_CTRL_FLUSH:
+ /* do a final write */
+ again:
+ while (ctx->buf_len != ctx->buf_off) {
+ i = enc_write(b, NULL, 0);
+ if (i < 0)
+ return i;
+ }
+
+ if (!ctx->finished) {
+ ctx->finished = 1;
+ ctx->buf_off = 0;
+ ret = EVP_CipherFinal_ex(ctx->cipher,
+ (unsigned char *)ctx->buf,
+ &(ctx->buf_len));
+ ctx->ok = (int)ret;
+ if (ret <= 0)
+ break;
+
+ /* push out the bytes */
+ goto again;
+ }
+
+ /* Finally flush the underlying BIO */
+ ret = BIO_ctrl(next, cmd, num, ptr);
+ break;
+ case BIO_C_GET_CIPHER_STATUS:
+ ret = (long)ctx->ok;
+ break;
+ case BIO_C_DO_STATE_MACHINE:
+ BIO_clear_retry_flags(b);
+ ret = BIO_ctrl(next, cmd, num, ptr);
+ BIO_copy_next_retry(b);
+ break;
+ case BIO_C_GET_CIPHER_CTX:
+ c_ctx = (EVP_CIPHER_CTX **)ptr;
+ *c_ctx = ctx->cipher;
+ BIO_set_init(b, 1);
+ break;
+ case BIO_CTRL_DUP:
+ dbio = (BIO *)ptr;
+ dctx = BIO_get_data(dbio);
+ dctx->cipher = EVP_CIPHER_CTX_new();
+ if (dctx->cipher == NULL)
+ return 0;
+ ret = EVP_CIPHER_CTX_copy(dctx->cipher, ctx->cipher);
+ if (ret)
+ BIO_set_init(dbio, 1);
+ break;
+ default:
+ ret = BIO_ctrl(next, cmd, num, ptr);
+ break;
+ }
+ return (ret);
+}
+
+static long enc_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
+{
+ long ret = 1;
+ BIO *next = BIO_next(b);
+
+ if (next == NULL)
+ return (0);
+ switch (cmd) {
+ default:
+ ret = BIO_callback_ctrl(next, cmd, fp);
+ break;
+ }
+ return (ret);
+}
+
+int BIO_set_cipher(BIO *b, const EVP_CIPHER *c, const unsigned char *k,
+ const unsigned char *i, int e)
+{
+ BIO_ENC_CTX *ctx;
+ long (*callback) (struct bio_st *, int, const char *, int, long, long);
+
+ ctx = BIO_get_data(b);
+ if (ctx == NULL)
+ return 0;
+
+ callback = BIO_get_callback(b);
+
+ if ((callback != NULL) &&
+ (callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e,
+ 0L) <= 0))
+ return 0;
+
+ BIO_set_init(b, 1);
+
+ if (!EVP_CipherInit_ex(ctx->cipher, c, NULL, k, i, e))
+ return 0;
+
+ if (callback != NULL)
+ return callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, 1L);
+ return 1;
+}
projects / openssl.git / blobdiff