--- /dev/null
+/* crypto/evp/bio_enc.c */
+/* 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 <stdio.h>
+#include <errno.h>
+#include "cryptlib.h"
+#include <openssl/buffer.h>
+#include <openssl/evp.h>
+
+static int enc_write(BIO *h, const char *buf, int num);
+static int enc_read(BIO *h, char *buf, int size);
+/*static int enc_puts(BIO *h, const char *str); */
+/*static int enc_gets(BIO *h, char *str, 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);
+static long enc_callback_ctrl(BIO *h, int cmd, bio_info_cb *fps);
+#define ENC_BLOCK_SIZE (1024*4)
+#define BUF_OFFSET (EVP_MAX_BLOCK_LENGTH*2)
+
+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;
+ /* buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate
+ * can return up to a block more data than is presented to it
+ */
+ char buf[ENC_BLOCK_SIZE+BUF_OFFSET+2];
+ } 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,
+ enc_callback_ctrl,
+ };
+
+BIO_METHOD *BIO_f_cipher(void)
+ {
+ return(&methods_enc);
+ }
+
+static int enc_new(BIO *bi)
+ {
+ BIO_ENC_CTX *ctx;
+
+ ctx=(BIO_ENC_CTX *)OPENSSL_malloc(sizeof(BIO_ENC_CTX));
+ if (ctx == NULL) return(0);
+ EVP_CIPHER_CTX_init(&ctx->cipher);
+
+ 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(BIO *a)
+ {
+ BIO_ENC_CTX *b;
+
+ if (a == NULL) return(0);
+ b=(BIO_ENC_CTX *)a->ptr;
+ EVP_CIPHER_CTX_cleanup(&(b->cipher));
+ OPENSSL_cleanse(a->ptr,sizeof(BIO_ENC_CTX));
+ OPENSSL_free(a->ptr);
+ a->ptr=NULL;
+ a->init=0;
+ a->flags=0;
+ return(1);
+ }
+
+static int enc_read(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 IV offset, read the EVP_Cipher
+ * documentation about why */
+ i=BIO_read(b->next_bio,&(ctx->buf[BUF_OFFSET]),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_ex(&(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[BUF_OFFSET]),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;
+
+ 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 (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;
+
+ ctx=(BIO_ENC_CTX *)b->ptr;
+
+ switch (cmd)
+ {
+ case BIO_CTRL_RESET:
+ ctx->ok=1;
+ ctx->finished=0;
+ EVP_CipherInit_ex(&(ctx->cipher),NULL,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)
+ 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(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;
+ EVP_CIPHER_CTX_init(&dctx->cipher);
+ ret = EVP_CIPHER_CTX_copy(&dctx->cipher,&ctx->cipher);
+ if (ret)
+ dbio->init=1;
+ break;
+ default:
+ ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
+ break;
+ }
+ return(ret);
+ }
+
+static long enc_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
+ {
+ long ret=1;
+
+ if (b->next_bio == NULL) return(0);
+ switch (cmd)
+ {
+ default:
+ ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
+ 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(BIO *b, const EVP_CIPHER *c, const unsigned char *k,
+ const unsigned char *i, int e)
+ {
+ BIO_ENC_CTX *ctx;
+
+ if (b == NULL) return;
+
+ if ((b->callback != NULL) &&
+ (b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,0L) <= 0))
+ return;
+
+ b->init=1;
+ ctx=(BIO_ENC_CTX *)b->ptr;
+ EVP_CipherInit_ex(&(ctx->cipher),c,NULL, k,i,e);
+
+ if (b->callback != NULL)
+ b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,1L);
+ }
+
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