diff options
Diffstat (limited to 'openssl/crypto/evp/bio_enc.c')
| -rw-r--r-- | openssl/crypto/evp/bio_enc.c | 428 |
1 files changed, 428 insertions, 0 deletions
diff --git a/openssl/crypto/evp/bio_enc.c b/openssl/crypto/evp/bio_enc.c new file mode 100644 index 00000000..b6efb5fb --- /dev/null +++ b/openssl/crypto/evp/bio_enc.c @@ -0,0 +1,428 @@ +/* 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); + } + |