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429 lines
11 KiB
C
429 lines
11 KiB
C
/*
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* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <errno.h>
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#include "internal/cryptlib.h"
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#include <openssl/buffer.h>
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#include <openssl/evp.h>
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#include "internal/bio.h"
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static int enc_write(BIO *h, const char *buf, int num);
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static int enc_read(BIO *h, char *buf, int size);
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static long enc_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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static int enc_new(BIO *h);
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static int enc_free(BIO *data);
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static long enc_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fps);
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#define ENC_BLOCK_SIZE (1024*4)
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#define ENC_MIN_CHUNK (256)
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#define BUF_OFFSET (ENC_MIN_CHUNK + EVP_MAX_BLOCK_LENGTH)
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typedef struct enc_struct {
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int buf_len;
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int buf_off;
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int cont; /* <= 0 when finished */
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int finished;
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int ok; /* bad decrypt */
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EVP_CIPHER_CTX *cipher;
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unsigned char *read_start, *read_end;
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/*
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* buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate can return
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* up to a block more data than is presented to it
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*/
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unsigned char buf[BUF_OFFSET + ENC_BLOCK_SIZE];
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} BIO_ENC_CTX;
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static const BIO_METHOD methods_enc = {
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BIO_TYPE_CIPHER,
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"cipher",
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/* TODO: Convert to new style write function */
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bwrite_conv,
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enc_write,
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/* TODO: Convert to new style read function */
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bread_conv,
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enc_read,
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NULL, /* enc_puts, */
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NULL, /* enc_gets, */
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enc_ctrl,
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enc_new,
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enc_free,
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enc_callback_ctrl,
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};
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const BIO_METHOD *BIO_f_cipher(void)
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{
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return &methods_enc;
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}
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static int enc_new(BIO *bi)
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{
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BIO_ENC_CTX *ctx;
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if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) {
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EVPerr(EVP_F_ENC_NEW, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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ctx->cipher = EVP_CIPHER_CTX_new();
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if (ctx->cipher == NULL) {
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OPENSSL_free(ctx);
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return 0;
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}
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ctx->cont = 1;
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ctx->ok = 1;
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ctx->read_end = ctx->read_start = &(ctx->buf[BUF_OFFSET]);
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BIO_set_data(bi, ctx);
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BIO_set_init(bi, 1);
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return 1;
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}
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static int enc_free(BIO *a)
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{
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BIO_ENC_CTX *b;
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if (a == NULL)
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return 0;
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b = BIO_get_data(a);
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if (b == NULL)
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return 0;
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EVP_CIPHER_CTX_free(b->cipher);
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OPENSSL_clear_free(b, sizeof(BIO_ENC_CTX));
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BIO_set_data(a, NULL);
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BIO_set_init(a, 0);
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return 1;
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}
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static int enc_read(BIO *b, char *out, int outl)
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{
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int ret = 0, i, blocksize;
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BIO_ENC_CTX *ctx;
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BIO *next;
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if (out == NULL)
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return 0;
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ctx = BIO_get_data(b);
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next = BIO_next(b);
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if ((ctx == NULL) || (next == NULL))
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return 0;
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/* First check if there are bytes decoded/encoded */
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if (ctx->buf_len > 0) {
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i = ctx->buf_len - ctx->buf_off;
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if (i > outl)
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i = outl;
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memcpy(out, &(ctx->buf[ctx->buf_off]), i);
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ret = i;
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out += i;
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outl -= i;
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ctx->buf_off += i;
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if (ctx->buf_len == ctx->buf_off) {
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ctx->buf_len = 0;
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ctx->buf_off = 0;
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}
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}
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blocksize = EVP_CIPHER_CTX_block_size(ctx->cipher);
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if (blocksize == 1)
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blocksize = 0;
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/*
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* At this point, we have room of outl bytes and an empty buffer, so we
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* should read in some more.
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*/
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while (outl > 0) {
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if (ctx->cont <= 0)
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break;
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if (ctx->read_start == ctx->read_end) { /* time to read more data */
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ctx->read_end = ctx->read_start = &(ctx->buf[BUF_OFFSET]);
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i = BIO_read(next, ctx->read_start, ENC_BLOCK_SIZE);
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if (i > 0)
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ctx->read_end += i;
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} else {
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i = ctx->read_end - ctx->read_start;
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}
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if (i <= 0) {
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/* Should be continue next time we are called? */
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if (!BIO_should_retry(next)) {
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ctx->cont = i;
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i = EVP_CipherFinal_ex(ctx->cipher,
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ctx->buf, &(ctx->buf_len));
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ctx->ok = i;
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ctx->buf_off = 0;
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} else {
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ret = (ret == 0) ? i : ret;
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break;
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}
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} else {
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if (outl > ENC_MIN_CHUNK) {
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/*
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* Depending on flags block cipher decrypt can write
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* one extra block and then back off, i.e. output buffer
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* has to accommodate extra block...
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*/
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int j = outl - blocksize, buf_len;
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if (!EVP_CipherUpdate(ctx->cipher,
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(unsigned char *)out, &buf_len,
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ctx->read_start, i > j ? j : i)) {
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BIO_clear_retry_flags(b);
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return 0;
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}
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ret += buf_len;
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out += buf_len;
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outl -= buf_len;
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if ((i -= j) <= 0) {
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ctx->read_start = ctx->read_end;
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continue;
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}
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ctx->read_start += j;
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}
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if (i > ENC_MIN_CHUNK)
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i = ENC_MIN_CHUNK;
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if (!EVP_CipherUpdate(ctx->cipher,
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ctx->buf, &ctx->buf_len,
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ctx->read_start, i)) {
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BIO_clear_retry_flags(b);
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ctx->ok = 0;
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return 0;
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}
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ctx->read_start += i;
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ctx->cont = 1;
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/*
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* Note: it is possible for EVP_CipherUpdate to decrypt zero
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* bytes because this is or looks like the final block: if this
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* happens we should retry and either read more data or decrypt
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* the final block
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*/
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if (ctx->buf_len == 0)
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continue;
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}
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if (ctx->buf_len <= outl)
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i = ctx->buf_len;
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else
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i = outl;
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if (i <= 0)
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break;
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memcpy(out, ctx->buf, i);
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ret += i;
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ctx->buf_off = i;
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outl -= i;
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out += i;
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}
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BIO_clear_retry_flags(b);
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BIO_copy_next_retry(b);
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return ((ret == 0) ? ctx->cont : ret);
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}
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static int enc_write(BIO *b, const char *in, int inl)
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{
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int ret = 0, n, i;
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BIO_ENC_CTX *ctx;
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BIO *next;
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ctx = BIO_get_data(b);
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next = BIO_next(b);
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if ((ctx == NULL) || (next == NULL))
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return 0;
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ret = inl;
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BIO_clear_retry_flags(b);
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n = ctx->buf_len - ctx->buf_off;
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while (n > 0) {
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i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
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if (i <= 0) {
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BIO_copy_next_retry(b);
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return i;
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}
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ctx->buf_off += i;
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n -= i;
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}
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/* at this point all pending data has been written */
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if ((in == NULL) || (inl <= 0))
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return 0;
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ctx->buf_off = 0;
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while (inl > 0) {
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n = (inl > ENC_BLOCK_SIZE) ? ENC_BLOCK_SIZE : inl;
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if (!EVP_CipherUpdate(ctx->cipher,
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ctx->buf, &ctx->buf_len,
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(const unsigned char *)in, n)) {
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BIO_clear_retry_flags(b);
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ctx->ok = 0;
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return 0;
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}
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inl -= n;
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in += n;
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ctx->buf_off = 0;
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n = ctx->buf_len;
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while (n > 0) {
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i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
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if (i <= 0) {
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BIO_copy_next_retry(b);
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return (ret == inl) ? i : ret - inl;
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}
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n -= i;
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ctx->buf_off += i;
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}
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ctx->buf_len = 0;
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ctx->buf_off = 0;
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}
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BIO_copy_next_retry(b);
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return ret;
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}
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static long enc_ctrl(BIO *b, int cmd, long num, void *ptr)
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{
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BIO *dbio;
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BIO_ENC_CTX *ctx, *dctx;
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long ret = 1;
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int i;
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EVP_CIPHER_CTX **c_ctx;
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BIO *next;
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ctx = BIO_get_data(b);
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next = BIO_next(b);
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if (ctx == NULL)
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return 0;
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switch (cmd) {
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case BIO_CTRL_RESET:
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ctx->ok = 1;
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ctx->finished = 0;
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if (!EVP_CipherInit_ex(ctx->cipher, NULL, NULL, NULL, NULL,
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EVP_CIPHER_CTX_encrypting(ctx->cipher)))
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return 0;
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ret = BIO_ctrl(next, cmd, num, ptr);
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break;
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case BIO_CTRL_EOF: /* More to read */
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if (ctx->cont <= 0)
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ret = 1;
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else
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ret = BIO_ctrl(next, cmd, num, ptr);
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break;
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case BIO_CTRL_WPENDING:
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ret = ctx->buf_len - ctx->buf_off;
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if (ret <= 0)
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ret = BIO_ctrl(next, cmd, num, ptr);
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break;
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case BIO_CTRL_PENDING: /* More to read in buffer */
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ret = ctx->buf_len - ctx->buf_off;
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if (ret <= 0)
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ret = BIO_ctrl(next, cmd, num, ptr);
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break;
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case BIO_CTRL_FLUSH:
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/* do a final write */
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again:
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while (ctx->buf_len != ctx->buf_off) {
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i = enc_write(b, NULL, 0);
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if (i < 0)
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return i;
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}
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if (!ctx->finished) {
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ctx->finished = 1;
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ctx->buf_off = 0;
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ret = EVP_CipherFinal_ex(ctx->cipher,
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(unsigned char *)ctx->buf,
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&(ctx->buf_len));
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ctx->ok = (int)ret;
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if (ret <= 0)
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break;
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/* push out the bytes */
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goto again;
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}
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/* Finally flush the underlying BIO */
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ret = BIO_ctrl(next, cmd, num, ptr);
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break;
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case BIO_C_GET_CIPHER_STATUS:
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ret = (long)ctx->ok;
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break;
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case BIO_C_DO_STATE_MACHINE:
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BIO_clear_retry_flags(b);
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ret = BIO_ctrl(next, cmd, num, ptr);
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BIO_copy_next_retry(b);
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break;
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case BIO_C_GET_CIPHER_CTX:
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c_ctx = (EVP_CIPHER_CTX **)ptr;
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*c_ctx = ctx->cipher;
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BIO_set_init(b, 1);
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break;
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case BIO_CTRL_DUP:
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dbio = (BIO *)ptr;
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dctx = BIO_get_data(dbio);
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dctx->cipher = EVP_CIPHER_CTX_new();
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if (dctx->cipher == NULL)
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return 0;
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ret = EVP_CIPHER_CTX_copy(dctx->cipher, ctx->cipher);
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if (ret)
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BIO_set_init(dbio, 1);
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break;
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default:
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ret = BIO_ctrl(next, cmd, num, ptr);
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break;
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}
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return ret;
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}
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static long enc_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
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{
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long ret = 1;
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BIO *next = BIO_next(b);
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if (next == NULL)
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return 0;
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switch (cmd) {
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default:
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ret = BIO_callback_ctrl(next, cmd, fp);
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break;
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}
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return ret;
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}
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int BIO_set_cipher(BIO *b, const EVP_CIPHER *c, const unsigned char *k,
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const unsigned char *i, int e)
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{
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BIO_ENC_CTX *ctx;
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long (*callback) (struct bio_st *, int, const char *, int, long, long);
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ctx = BIO_get_data(b);
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if (ctx == NULL)
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return 0;
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callback = BIO_get_callback(b);
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if ((callback != NULL) &&
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(callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e,
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0L) <= 0))
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return 0;
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BIO_set_init(b, 1);
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if (!EVP_CipherInit_ex(ctx->cipher, c, NULL, k, i, e))
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return 0;
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if (callback != NULL)
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return callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, 1L);
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return 1;
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}
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