X-Git-Url: https://git.openssl.org/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fevp%2Fbio_enc.c;h=2e6ce33e4e5a4c25ed960968a2d78936c7c80f75;hp=ad09b94b1a186e351f011417ff355ff368d1f579;hb=64b25758edca688a30f02c260262150f7ad0bc7d;hpb=31b8d8684441e6cd5138832bb1b2ddb10acd6ba6 diff --git a/crypto/evp/bio_enc.c b/crypto/evp/bio_enc.c index ad09b94b1a..2e6ce33e4e 100644 --- a/crypto/evp/bio_enc.c +++ b/crypto/evp/bio_enc.c @@ -5,21 +5,21 @@ * 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: @@ -34,10 +34,10 @@ * 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 + * 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 @@ -49,7 +49,7 @@ * 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 @@ -58,371 +58,377 @@ #include #include -#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); -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); - } +#include "internal/cryptlib.h" +#include +#include +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 = OPENSSL_zalloc(sizeof(*ctx)); + if (ctx == NULL) + return (0); + + EVP_CIPHER_CTX_init(&ctx->cipher); + ctx->cont = 1; + 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_clear_free(a->ptr, sizeof(BIO_ENC_CTX)); + 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 { + if (!EVP_CipherUpdate(&(ctx->cipher), + (unsigned char *)ctx->buf, &ctx->buf_len, + (unsigned char *)&(ctx->buf[BUF_OFFSET]), + i)) { + BIO_clear_retry_flags(b); + return 0; + } + 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; + if (!EVP_CipherUpdate(&(ctx->cipher), + (unsigned char *)ctx->buf, &ctx->buf_len, + (unsigned char *)in, n)) { + BIO_clear_retry_flags(b); + return 0; + } + 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; + if (!EVP_CipherInit_ex(&(ctx->cipher), NULL, NULL, NULL, NULL, + ctx->cipher.encrypt)) + return 0; + 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); - } -*/ + { + if (b == NULL) return; -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); - } + 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); + } +*/ +int 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 0; + + if ((b->callback != NULL) && + (b->callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, 0L) <= + 0)) + return 0; + + b->init = 1; + ctx = (BIO_ENC_CTX *)b->ptr; + if (!EVP_CipherInit_ex(&(ctx->cipher), c, NULL, k, i, e)) + return 0; + + if (b->callback != NULL) + return b->callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, + 1L); + return 1; +}