/* crypto/evp/bio_enc.c */
-/* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
#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 <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);
-#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
-
+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 finished;
int ok; /* bad decrypt */
EVP_CIPHER_CTX cipher;
- char buf[ENC_BLOCK_SIZE+10];
+ /* 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=
enc_ctrl,
enc_new,
enc_free,
+ enc_callback_ctrl,
};
-BIO_METHOD *BIO_f_cipher()
+BIO_METHOD *BIO_f_cipher(void)
{
return(&methods_enc);
}
-static int enc_new(bi)
-BIO *bi;
+static int enc_new(BIO *bi)
{
BIO_ENC_CTX *ctx;
- ctx=(BIO_ENC_CTX *)Malloc(sizeof(BIO_ENC_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;
return(1);
}
-static int enc_free(a)
-BIO *a;
+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));
- memset(a->ptr,0,sizeof(BIO_ENC_CTX));
- Free(a->ptr);
+ 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(b,out,outl)
-BIO *b;
-char *out;
-int outl;
+static int enc_read(BIO *b, char *out, int outl)
{
int ret=0,i;
BIO_ENC_CTX *ctx;
{
if (ctx->cont <= 0) break;
- /* read in at offset 8, read the EVP_Cipher
+ /* read in at IV offset, read the EVP_Cipher
* documentation about why */
- i=BIO_read(b->next_bio,&(ctx->buf[8]),ENC_BLOCK_SIZE);
+ i=BIO_read(b->next_bio,&(ctx->buf[BUF_OFFSET]),ENC_BLOCK_SIZE);
if (i <= 0)
{
if (!BIO_should_retry(b->next_bio))
{
ctx->cont=i;
- i=EVP_CipherFinal(&(ctx->cipher),
+ i=EVP_CipherFinal_ex(&(ctx->cipher),
(unsigned char *)ctx->buf,
&(ctx->buf_len));
ctx->ok=i;
ctx->buf_off=0;
}
- else
+ else
+ {
ret=(ret == 0)?i:ret;
- break;
+ break;
+ }
}
else
{
EVP_CipherUpdate(&(ctx->cipher),
(unsigned char *)ctx->buf,&ctx->buf_len,
- (unsigned char *)&(ctx->buf[8]),i);
+ (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;
return((ret == 0)?ctx->cont:ret);
}
-static int enc_write(b,in,inl)
-BIO *b;
-char *in;
-int inl;
+static int enc_write(BIO *b, const char *in, int inl)
{
int ret=0,n,i;
BIO_ENC_CTX *ctx;
if (i <= 0)
{
BIO_copy_next_retry(b);
- return(i);
+ return (ret == inl) ? i : ret - inl;
}
n-=i;
ctx->buf_off+=i;
return(ret);
}
-static long enc_ctrl(b,cmd,num,ptr)
-BIO *b;
-int cmd;
-long num;
-char *ptr;
+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;
case BIO_CTRL_RESET:
ctx->ok=1;
ctx->finished=0;
- EVP_CipherInit(&(ctx->cipher),NULL,NULL,NULL,
+ EVP_CipherInit_ex(&(ctx->cipher),NULL,NULL,NULL,NULL,
ctx->cipher.encrypt);
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
break;
{
i=enc_write(b,NULL,0);
if (i < 0)
- {
- ret=i;
- break;
- }
+ return i;
}
if (!ctx->finished)
{
ctx->finished=1;
ctx->buf_off=0;
- ret=EVP_CipherFinal(&(ctx->cipher),
+ ret=EVP_CipherFinal_ex(&(ctx->cipher),
(unsigned char *)ctx->buf,
&(ctx->buf_len));
ctx->ok=(int)ret;
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;
return(ret);
}
-void BIO_set_cipher(b,c,k,i,e)
-BIO *b;
-EVP_CIPHER *c;
-unsigned char *k;
-unsigned char *i;
-int e;
+static long enc_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
{
- BIO_ENC_CTX *ctx;
+ 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->init=1;
ctx=(BIO_ENC_CTX *)b->ptr;
- EVP_CipherInit(&(ctx->cipher),c,k,i,e);
+ 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);
+ }
projects / openssl.git / blobdiff