/src/openssl/crypto/evp/bio_enc.c

Source
/*
 * Copyright 1995-2025 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#define OPENSSL_SUPPRESS_DEPRECATED /* for BIO_get_callback */

#include <stdio.h>
#include <errno.h>
#include "internal/cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/evp.h>
#include "internal/bio.h"

static int enc_write(BIO *h, const char *buf, int num);
static int enc_read(BIO *h, char *buf, 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 ENC_MIN_CHUNK   (256)
#define BUF_OFFSET      (ENC_MIN_CHUNK + EVP_MAX_BLOCK_LENGTH)

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;
    unsigned char *read_start, *read_end;
    /*
     * buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate can return
     * up to a block more data than is presented to it
     */
    unsigned char buf[BUF_OFFSET + ENC_BLOCK_SIZE];
} BIO_ENC_CTX;

static const BIO_METHOD methods_enc = {
    BIO_TYPE_CIPHER,
    "cipher",
    bwrite_conv,
    enc_write,
    bread_conv,
    enc_read,
    NULL,                       /* enc_puts, */
    NULL,                       /* enc_gets, */
    enc_ctrl,
    enc_new,
    enc_free,
    enc_callback_ctrl,
};

const BIO_METHOD *BIO_f_cipher(void)
{
    return &methods_enc;
}

static int enc_new(BIO *bi)
{
    BIO_ENC_CTX *ctx;

    if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL)
        return 0;

    ctx->cipher = EVP_CIPHER_CTX_new();
    if (ctx->cipher == NULL) {
        OPENSSL_free(ctx);
        return 0;
    }
    ctx->cont = 1;
    ctx->ok = 1;
    ctx->read_end = ctx->read_start = &(ctx->buf[BUF_OFFSET]);
    BIO_set_data(bi, ctx);
    BIO_set_init(bi, 1);

    return 1;
}

static int enc_free(BIO *a)
{
    BIO_ENC_CTX *b;

    if (a == NULL)
        return 0;

    b = BIO_get_data(a);
    if (b == NULL)
        return 0;

    EVP_CIPHER_CTX_free(b->cipher);
    OPENSSL_clear_free(b, sizeof(BIO_ENC_CTX));
    BIO_set_data(a, NULL);
    BIO_set_init(a, 0);

    return 1;
}

static int enc_read(BIO *b, char *out, int outl)
{
    int ret = 0, i, blocksize;
    BIO_ENC_CTX *ctx;
    BIO *next;

    if (out == NULL)
        return 0;
    ctx = BIO_get_data(b);

    next = BIO_next(b);
    if ((ctx == NULL) || (next == 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;
        }
    }

    blocksize = EVP_CIPHER_CTX_get_block_size(ctx->cipher);

    if (blocksize == 0)
        return 0;

    if (blocksize == 1)
        blocksize = 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;

        if (ctx->read_start == ctx->read_end) { /* time to read more data */
            ctx->read_end = ctx->read_start = &(ctx->buf[BUF_OFFSET]);
            i = BIO_read(next, ctx->read_start, ENC_BLOCK_SIZE);
            if (i > 0)
                ctx->read_end += i;
        } else {
            i = (int)(ctx->read_end - ctx->read_start);
        }

        if (i <= 0) {
            /* Should be continue next time we are called? */
            if (!BIO_should_retry(next)) {
                ctx->cont = i;
                ctx->finished = 1;
                i = EVP_CipherFinal_ex(ctx->cipher,
                                       ctx->buf, &(ctx->buf_len));
                ctx->ok = i;
                ctx->buf_off = 0;
            } else {
                ret = (ret == 0) ? i : ret;
                break;
            }
        } else {
            if (outl > ENC_MIN_CHUNK) {
                /*
                 * Depending on flags block cipher decrypt can write
                 * one extra block and then back off, i.e. output buffer
                 * has to accommodate extra block...
                 */
                int j = outl - blocksize, buf_len;

                if (!EVP_CipherUpdate(ctx->cipher,
                                      (unsigned char *)out, &buf_len,
                                      ctx->read_start, i > j ? j : i)) {
                    BIO_clear_retry_flags(b);
                    return 0;
                }
                ret += buf_len;
                out += buf_len;
                outl -= buf_len;

                if ((i -= j) <= 0) {
                    ctx->read_start = ctx->read_end;
                    continue;
                }
                ctx->read_start += j;
            }
            if (i > ENC_MIN_CHUNK)
                i = ENC_MIN_CHUNK;
            if (!EVP_CipherUpdate(ctx->cipher,
                                  ctx->buf, &ctx->buf_len,
                                  ctx->read_start, i)) {
                BIO_clear_retry_flags(b);
                ctx->ok = 0;
                return 0;
            }
            ctx->read_start += 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;
    BIO *next;

    ctx = BIO_get_data(b);
    next = BIO_next(b);
    if ((ctx == NULL) || (next == NULL))
        return 0;

    ret = inl;

    BIO_clear_retry_flags(b);
    n = ctx->buf_len - ctx->buf_off;
    while (n > 0) {
        i = BIO_write(next, &(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,
                              ctx->buf, &ctx->buf_len,
                              (const unsigned char *)in, n)) {
            BIO_clear_retry_flags(b);
            ctx->ok = 0;
            return 0;
        }
        inl -= n;
        in += n;

        ctx->buf_off = 0;
        n = ctx->buf_len;
        while (n > 0) {
            i = BIO_write(next, &(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;
    BIO *next;
    int pend;

    ctx = BIO_get_data(b);
    next = BIO_next(b);
    if (ctx == NULL)
        return 0;

    switch (cmd) {
    case BIO_CTRL_RESET:
        ctx->ok = 1;
        ctx->finished = 0;
        if (!EVP_CipherInit_ex(ctx->cipher, NULL, NULL, NULL, NULL,
                               EVP_CIPHER_CTX_is_encrypting(ctx->cipher)))
            return 0;
        ret = BIO_ctrl(next, cmd, num, ptr);
        break;
    case BIO_CTRL_EOF:         /* More to read */
        if (ctx->cont <= 0)
            ret = 1;
        else
            ret = BIO_ctrl(next, cmd, num, ptr);
        break;
    case BIO_CTRL_WPENDING:
        ret = ctx->buf_len - ctx->buf_off;
        if (ret <= 0)
            ret = BIO_ctrl(next, 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(next, cmd, num, ptr);
        break;
    case BIO_CTRL_FLUSH:
        /* do a final write */
 again:
        while (ctx->buf_len != ctx->buf_off) {
            pend = ctx->buf_len - ctx->buf_off;
            i = enc_write(b, NULL, 0);
            /*
             * i should never be > 0 here because we didn't ask to write any
             * new data. We stop if we get an error or we failed to make any
             * progress writing pending data.
             */
            if (i < 0 || (ctx->buf_len - ctx->buf_off) == pend)
                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(next, cmd, num, ptr);
        BIO_copy_next_retry(b);
        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(next, 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;
        BIO_set_init(b, 1);
        break;
    case BIO_CTRL_DUP:
        dbio = (BIO *)ptr;
        dctx = BIO_get_data(dbio);
        dctx->cipher = EVP_CIPHER_CTX_new();
        if (dctx->cipher == NULL)
            return 0;
        ret = EVP_CIPHER_CTX_copy(dctx->cipher, ctx->cipher);
        if (ret)
            BIO_set_init(dbio, 1);
        break;
    default:
        ret = BIO_ctrl(next, cmd, num, ptr);
        break;
    }
    return ret;
}

static long enc_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
{
    BIO *next = BIO_next(b);

    if (next == NULL)
        return 0;

    return BIO_callback_ctrl(next, cmd, fp);
}

int BIO_set_cipher(BIO *b, const EVP_CIPHER *c, const unsigned char *k,
                   const unsigned char *i, int e)
{
    BIO_ENC_CTX *ctx;
    BIO_callback_fn_ex callback_ex;
#ifndef OPENSSL_NO_DEPRECATED_3_0
    long (*callback) (struct bio_st *, int, const char *, int, long, long) = NULL;
#endif

    ctx = BIO_get_data(b);
    if (ctx == NULL)
        return 0;

    if ((callback_ex = BIO_get_callback_ex(b)) != NULL) {
        if (callback_ex(b, BIO_CB_CTRL, (const char *)c, 0, BIO_CTRL_SET,
                        e, 1, NULL) <= 0)
            return 0;
    }
#ifndef OPENSSL_NO_DEPRECATED_3_0
    else {
        callback = BIO_get_callback(b);

        if ((callback != NULL) &&
            (callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e,
                      0L) <= 0))
            return 0;
    }
#endif

    BIO_set_init(b, 1);

    if (!EVP_CipherInit_ex(ctx->cipher, c, NULL, k, i, e))
        return 0;

    if (callback_ex != NULL)
        return callback_ex(b, BIO_CB_CTRL | BIO_CB_RETURN, (const char *)c, 0,
                           BIO_CTRL_SET, e, 1, NULL);
#ifndef OPENSSL_NO_DEPRECATED_3_0
    else if (callback != NULL)
        return callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, 1L);
#endif
    return 1;
}

Coverage Report

Created: 2025-10-28 06:56

Line	Count	Source
1		/*
2		* Copyright 1995-2025 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the Apache License 2.0 (the "License"). You may not use
5		* this file except in compliance with the License. You can obtain a copy
6		* in the file LICENSE in the source distribution or at
7		* https://www.openssl.org/source/license.html
8		*/
9
10		#define OPENSSL_SUPPRESS_DEPRECATED /* for BIO_get_callback */
11
12		#include <stdio.h>
13		#include <errno.h>
14		#include "internal/cryptlib.h"
15		#include <openssl/buffer.h>
16		#include <openssl/evp.h>
17		#include "internal/bio.h"
18
19		static int enc_write(BIO h, const char buf, int num);
20		static int enc_read(BIO h, char buf, int size);
21		static long enc_ctrl(BIO h, int cmd, long arg1, void arg2);
22		static int enc_new(BIO *h);
23		static int enc_free(BIO *data);
24		static long enc_callback_ctrl(BIO h, int cmd, BIO_info_cb fps);
25	0	#define ENC_BLOCK_SIZE (1024*4)
26	0	#define ENC_MIN_CHUNK (256)
27	0	#define BUF_OFFSET (ENC_MIN_CHUNK + EVP_MAX_BLOCK_LENGTH)
28
29		typedef struct enc_struct {
30		int buf_len;
31		int buf_off;
32		int cont; /* <= 0 when finished */
33		int finished;
34		int ok; /* bad decrypt */
35		EVP_CIPHER_CTX *cipher;
36		unsigned char read_start, read_end;
37		/*
38		* buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate can return
39		* up to a block more data than is presented to it
40		*/
41		unsigned char buf[BUF_OFFSET + ENC_BLOCK_SIZE];
42		} BIO_ENC_CTX;
43
44		static const BIO_METHOD methods_enc = {
45		BIO_TYPE_CIPHER,
46		"cipher",
47		bwrite_conv,
48		enc_write,
49		bread_conv,
50		enc_read,
51		NULL, /* enc_puts, */
52		NULL, /* enc_gets, */
53		enc_ctrl,
54		enc_new,
55		enc_free,
56		enc_callback_ctrl,
57		};
58
59		const BIO_METHOD *BIO_f_cipher(void)
60	0	{
61	0	return &methods_enc;
62	0	}
63
64		static int enc_new(BIO *bi)
65	0	{
66	0	BIO_ENC_CTX *ctx;
67
68	0	if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL)
69	0	return 0;
70
71	0	ctx->cipher = EVP_CIPHER_CTX_new();
72	0	if (ctx->cipher == NULL) {
73	0	OPENSSL_free(ctx);
74	0	return 0;
75	0	}
76	0	ctx->cont = 1;
77	0	ctx->ok = 1;
78	0	ctx->read_end = ctx->read_start = &(ctx->buf[BUF_OFFSET]);
79	0	BIO_set_data(bi, ctx);
80	0	BIO_set_init(bi, 1);
81
82	0	return 1;
83	0	}
84
85		static int enc_free(BIO *a)
86	0	{
87	0	BIO_ENC_CTX *b;
88
89	0	if (a == NULL)
90	0	return 0;
91
92	0	b = BIO_get_data(a);
93	0	if (b == NULL)
94	0	return 0;
95
96	0	EVP_CIPHER_CTX_free(b->cipher);
97	0	OPENSSL_clear_free(b, sizeof(BIO_ENC_CTX));
98	0	BIO_set_data(a, NULL);
99	0	BIO_set_init(a, 0);
100
101	0	return 1;
102	0	}
103
104		static int enc_read(BIO b, char out, int outl)
105	0	{
106	0	int ret = 0, i, blocksize;
107	0	BIO_ENC_CTX *ctx;
108	0	BIO *next;
109
110	0	if (out == NULL)
111	0	return 0;
112	0	ctx = BIO_get_data(b);
113
114	0	next = BIO_next(b);
115	0	if ((ctx == NULL) \|\| (next == NULL))
116	0	return 0;
117
118		/* First check if there are bytes decoded/encoded */
119	0	if (ctx->buf_len > 0) {
120	0	i = ctx->buf_len - ctx->buf_off;
121	0	if (i > outl)
122	0	i = outl;
123	0	memcpy(out, &(ctx->buf[ctx->buf_off]), i);
124	0	ret = i;
125	0	out += i;
126	0	outl -= i;
127	0	ctx->buf_off += i;
128	0	if (ctx->buf_len == ctx->buf_off) {
129	0	ctx->buf_len = 0;
130	0	ctx->buf_off = 0;
131	0	}
132	0	}
133
134	0	blocksize = EVP_CIPHER_CTX_get_block_size(ctx->cipher);
135
136	0	if (blocksize == 0)
137	0	return 0;
138
139	0	if (blocksize == 1)
140	0	blocksize = 0;
141
142		/*
143		* At this point, we have room of outl bytes and an empty buffer, so we
144		* should read in some more.
145		*/
146
147	0	while (outl > 0) {
148	0	if (ctx->cont <= 0)
149	0	break;
150
151	0	if (ctx->read_start == ctx->read_end) { /* time to read more data */
152	0	ctx->read_end = ctx->read_start = &(ctx->buf[BUF_OFFSET]);
153	0	i = BIO_read(next, ctx->read_start, ENC_BLOCK_SIZE);
154	0	if (i > 0)
155	0	ctx->read_end += i;
156	0	} else {
157	0	i = (int)(ctx->read_end - ctx->read_start);
158	0	}
159
160	0	if (i <= 0) {
161		/* Should be continue next time we are called? */
162	0	if (!BIO_should_retry(next)) {
163	0	ctx->cont = i;
164	0	ctx->finished = 1;
165	0	i = EVP_CipherFinal_ex(ctx->cipher,
166	0	ctx->buf, &(ctx->buf_len));
167	0	ctx->ok = i;
168	0	ctx->buf_off = 0;
169	0	} else {
170	0	ret = (ret == 0) ? i : ret;
171	0	break;
172	0	}
173	0	} else {
174	0	if (outl > ENC_MIN_CHUNK) {
175		/*
176		* Depending on flags block cipher decrypt can write
177		* one extra block and then back off, i.e. output buffer
178		* has to accommodate extra block...
179		*/
180	0	int j = outl - blocksize, buf_len;
181
182	0	if (!EVP_CipherUpdate(ctx->cipher,
183	0	(unsigned char *)out, &buf_len,
184	0	ctx->read_start, i > j ? j : i)) {
185	0	BIO_clear_retry_flags(b);
186	0	return 0;
187	0	}
188	0	ret += buf_len;
189	0	out += buf_len;
190	0	outl -= buf_len;
191
192	0	if ((i -= j) <= 0) {
193	0	ctx->read_start = ctx->read_end;
194	0	continue;
195	0	}
196	0	ctx->read_start += j;
197	0	}
198	0	if (i > ENC_MIN_CHUNK)
199	0	i = ENC_MIN_CHUNK;
200	0	if (!EVP_CipherUpdate(ctx->cipher,
201	0	ctx->buf, &ctx->buf_len,
202	0	ctx->read_start, i)) {
203	0	BIO_clear_retry_flags(b);
204	0	ctx->ok = 0;
205	0	return 0;
206	0	}
207	0	ctx->read_start += i;
208	0	ctx->cont = 1;
209		/*
210		* Note: it is possible for EVP_CipherUpdate to decrypt zero
211		* bytes because this is or looks like the final block: if this
212		* happens we should retry and either read more data or decrypt
213		* the final block
214		*/
215	0	if (ctx->buf_len == 0)
216	0	continue;
217	0	}
218
219	0	if (ctx->buf_len <= outl)
220	0	i = ctx->buf_len;
221	0	else
222	0	i = outl;
223	0	if (i <= 0)
224	0	break;
225	0	memcpy(out, ctx->buf, i);
226	0	ret += i;
227	0	ctx->buf_off = i;
228	0	outl -= i;
229	0	out += i;
230	0	}
231
232	0	BIO_clear_retry_flags(b);
233	0	BIO_copy_next_retry(b);
234	0	return ((ret == 0) ? ctx->cont : ret);
235	0	}
236
237		static int enc_write(BIO b, const char in, int inl)
238	0	{
239	0	int ret = 0, n, i;
240	0	BIO_ENC_CTX *ctx;
241	0	BIO *next;
242
243	0	ctx = BIO_get_data(b);
244	0	next = BIO_next(b);
245	0	if ((ctx == NULL) \|\| (next == NULL))
246	0	return 0;
247
248	0	ret = inl;
249
250	0	BIO_clear_retry_flags(b);
251	0	n = ctx->buf_len - ctx->buf_off;
252	0	while (n > 0) {
253	0	i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
254	0	if (i <= 0) {
255	0	BIO_copy_next_retry(b);
256	0	return i;
257	0	}
258	0	ctx->buf_off += i;
259	0	n -= i;
260	0	}
261		/* at this point all pending data has been written */
262
263	0	if ((in == NULL) \|\| (inl <= 0))
264	0	return 0;
265
266	0	ctx->buf_off = 0;
267	0	while (inl > 0) {
268	0	n = (inl > ENC_BLOCK_SIZE) ? ENC_BLOCK_SIZE : inl;
269	0	if (!EVP_CipherUpdate(ctx->cipher,
270	0	ctx->buf, &ctx->buf_len,
271	0	(const unsigned char *)in, n)) {
272	0	BIO_clear_retry_flags(b);
273	0	ctx->ok = 0;
274	0	return 0;
275	0	}
276	0	inl -= n;
277	0	in += n;
278
279	0	ctx->buf_off = 0;
280	0	n = ctx->buf_len;
281	0	while (n > 0) {
282	0	i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
283	0	if (i <= 0) {
284	0	BIO_copy_next_retry(b);
285	0	return (ret == inl) ? i : ret - inl;
286	0	}
287	0	n -= i;
288	0	ctx->buf_off += i;
289	0	}
290	0	ctx->buf_len = 0;
291	0	ctx->buf_off = 0;
292	0	}
293	0	BIO_copy_next_retry(b);
294	0	return ret;
295	0	}
296
297		static long enc_ctrl(BIO b, int cmd, long num, void ptr)
298	0	{
299	0	BIO *dbio;
300	0	BIO_ENC_CTX ctx, dctx;
301	0	long ret = 1;
302	0	int i;
303	0	EVP_CIPHER_CTX **c_ctx;
304	0	BIO *next;
305	0	int pend;
306
307	0	ctx = BIO_get_data(b);
308	0	next = BIO_next(b);
309	0	if (ctx == NULL)
310	0	return 0;
311
312	0	switch (cmd) {
313	0	case BIO_CTRL_RESET:
314	0	ctx->ok = 1;
315	0	ctx->finished = 0;
316	0	if (!EVP_CipherInit_ex(ctx->cipher, NULL, NULL, NULL, NULL,
317	0	EVP_CIPHER_CTX_is_encrypting(ctx->cipher)))
318	0	return 0;
319	0	ret = BIO_ctrl(next, cmd, num, ptr);
320	0	break;
321	0	case BIO_CTRL_EOF: /* More to read */
322	0	if (ctx->cont <= 0)
323	0	ret = 1;
324	0	else
325	0	ret = BIO_ctrl(next, cmd, num, ptr);
326	0	break;
327	0	case BIO_CTRL_WPENDING:
328	0	ret = ctx->buf_len - ctx->buf_off;
329	0	if (ret <= 0)
330	0	ret = BIO_ctrl(next, cmd, num, ptr);
331	0	break;
332	0	case BIO_CTRL_PENDING: /* More to read in buffer */
333	0	ret = ctx->buf_len - ctx->buf_off;
334	0	if (ret <= 0)
335	0	ret = BIO_ctrl(next, cmd, num, ptr);
336	0	break;
337	0	case BIO_CTRL_FLUSH:
338		/* do a final write */
339	0	again:
340	0	while (ctx->buf_len != ctx->buf_off) {
341	0	pend = ctx->buf_len - ctx->buf_off;
342	0	i = enc_write(b, NULL, 0);
343		/*
344		* i should never be > 0 here because we didn't ask to write any
345		* new data. We stop if we get an error or we failed to make any
346		* progress writing pending data.
347		*/
348	0	if (i < 0 \|\| (ctx->buf_len - ctx->buf_off) == pend)
349	0	return i;
350	0	}
351
352	0	if (!ctx->finished) {
353	0	ctx->finished = 1;
354	0	ctx->buf_off = 0;
355	0	ret = EVP_CipherFinal_ex(ctx->cipher,
356	0	(unsigned char *)ctx->buf,
357	0	&(ctx->buf_len));
358	0	ctx->ok = (int)ret;
359	0	if (ret <= 0)
360	0	break;
361
362		/* push out the bytes */
363	0	goto again;
364	0	}
365
366		/* Finally flush the underlying BIO */
367	0	ret = BIO_ctrl(next, cmd, num, ptr);
368	0	BIO_copy_next_retry(b);
369	0	break;
370	0	case BIO_C_GET_CIPHER_STATUS:
371	0	ret = (long)ctx->ok;
372	0	break;
373	0	case BIO_C_DO_STATE_MACHINE:
374	0	BIO_clear_retry_flags(b);
375	0	ret = BIO_ctrl(next, cmd, num, ptr);
376	0	BIO_copy_next_retry(b);
377	0	break;
378	0	case BIO_C_GET_CIPHER_CTX:
379	0	c_ctx = (EVP_CIPHER_CTX **)ptr;
380	0	*c_ctx = ctx->cipher;
381	0	BIO_set_init(b, 1);
382	0	break;
383	0	case BIO_CTRL_DUP:
384	0	dbio = (BIO *)ptr;
385	0	dctx = BIO_get_data(dbio);
386	0	dctx->cipher = EVP_CIPHER_CTX_new();
387	0	if (dctx->cipher == NULL)
388	0	return 0;
389	0	ret = EVP_CIPHER_CTX_copy(dctx->cipher, ctx->cipher);
390	0	if (ret)
391	0	BIO_set_init(dbio, 1);
392	0	break;
393	0	default:
394	0	ret = BIO_ctrl(next, cmd, num, ptr);
395	0	break;
396	0	}
397	0	return ret;
398	0	}
399
400		static long enc_callback_ctrl(BIO b, int cmd, BIO_info_cb fp)
401	0	{
402	0	BIO *next = BIO_next(b);
403
404	0	if (next == NULL)
405	0	return 0;
406
407	0	return BIO_callback_ctrl(next, cmd, fp);
408	0	}
409
410		int BIO_set_cipher(BIO b, const EVP_CIPHER c, const unsigned char *k,
411		const unsigned char *i, int e)
412	0	{
413	0	BIO_ENC_CTX *ctx;
414	0	BIO_callback_fn_ex callback_ex;
415	0	#ifndef OPENSSL_NO_DEPRECATED_3_0
416	0	long (callback) (struct bio_st , int, const char *, int, long, long) = NULL;
417	0	#endif
418
419	0	ctx = BIO_get_data(b);
420	0	if (ctx == NULL)
421	0	return 0;
422
423	0	if ((callback_ex = BIO_get_callback_ex(b)) != NULL) {
424	0	if (callback_ex(b, BIO_CB_CTRL, (const char *)c, 0, BIO_CTRL_SET,
425	0	e, 1, NULL) <= 0)
426	0	return 0;
427	0	}
428	0	#ifndef OPENSSL_NO_DEPRECATED_3_0
429	0	else {
430	0	callback = BIO_get_callback(b);
431
432	0	if ((callback != NULL) &&
433	0	(callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e,
434	0	0L) <= 0))
435	0	return 0;
436	0	}
437	0	#endif
438
439	0	BIO_set_init(b, 1);
440
441	0	if (!EVP_CipherInit_ex(ctx->cipher, c, NULL, k, i, e))
442	0	return 0;
443
444	0	if (callback_ex != NULL)
445	0	return callback_ex(b, BIO_CB_CTRL \| BIO_CB_RETURN, (const char *)c, 0,
446	0	BIO_CTRL_SET, e, 1, NULL);
447	0	#ifndef OPENSSL_NO_DEPRECATED_3_0
448	0	else if (callback != NULL)
449	0	return callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, 1L);
450	0	#endif
451	0	return 1;
452	0	}