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

Source (jump to first uncovered line)
/*
 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (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
 */

#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",
    /* TODO: Convert to new style write function */
    bwrite_conv,
    enc_write,
    /* TODO: Convert to new style read function */
    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) {
        EVPerr(EVP_F_ENC_NEW, ERR_R_MALLOC_FAILURE);
        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_block_size(ctx->cipher);
    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 = 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;
                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;

    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_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) {
            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(next, 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(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)
{
    long ret = 1;
    BIO *next = BIO_next(b);

    if (next == NULL)
        return 0;
    switch (cmd) {
    default:
        ret = BIO_callback_ctrl(next, cmd, fp);
        break;
    }
    return ret;
}

int BIO_set_cipher(BIO *b, const EVP_CIPHER *c, const unsigned char *k,
                   const unsigned char *i, int e)
{
    BIO_ENC_CTX *ctx;
    long (*callback) (struct bio_st *, int, const char *, int, long, long);

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

    callback = BIO_get_callback(b);

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

    BIO_set_init(b, 1);

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

    if (callback != NULL)
        return callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, 1L);
    return 1;
}

Coverage Report

Created: 2018-08-29 13:53

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the OpenSSL license (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		#include <stdio.h>
11		#include <errno.h>
12		#include "internal/cryptlib.h"
13		#include <openssl/buffer.h>
14		#include <openssl/evp.h>
15		#include "internal/bio.h"
16
17		static int enc_write(BIO h, const char buf, int num);
18		static int enc_read(BIO h, char buf, int size);
19		static long enc_ctrl(BIO h, int cmd, long arg1, void arg2);
20		static int enc_new(BIO *h);
21		static int enc_free(BIO *data);
22		static long enc_callback_ctrl(BIO h, int cmd, BIO_info_cb fps);
23	0	#define ENC_BLOCK_SIZE (1024*4)
24	0	#define ENC_MIN_CHUNK (256)
25	0	#define BUF_OFFSET (ENC_MIN_CHUNK + EVP_MAX_BLOCK_LENGTH)
26
27		typedef struct enc_struct {
28		int buf_len;
29		int buf_off;
30		int cont; /* <= 0 when finished */
31		int finished;
32		int ok; /* bad decrypt */
33		EVP_CIPHER_CTX *cipher;
34		unsigned char read_start, read_end;
35		/*
36		* buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate can return
37		* up to a block more data than is presented to it
38		*/
39		unsigned char buf[BUF_OFFSET + ENC_BLOCK_SIZE];
40		} BIO_ENC_CTX;
41
42		static const BIO_METHOD methods_enc = {
43		BIO_TYPE_CIPHER,
44		"cipher",
45		/* TODO: Convert to new style write function */
46		bwrite_conv,
47		enc_write,
48		/* TODO: Convert to new style read function */
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	0
68	0	if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) {
69	0	EVPerr(EVP_F_ENC_NEW, ERR_R_MALLOC_FAILURE);
70	0	return 0;
71	0	}
72	0
73	0	ctx->cipher = EVP_CIPHER_CTX_new();
74	0	if (ctx->cipher == NULL) {
75	0	OPENSSL_free(ctx);
76	0	return 0;
77	0	}
78	0	ctx->cont = 1;
79	0	ctx->ok = 1;
80	0	ctx->read_end = ctx->read_start = &(ctx->buf[BUF_OFFSET]);
81	0	BIO_set_data(bi, ctx);
82	0	BIO_set_init(bi, 1);
83	0
84	0	return 1;
85	0	}
86
87		static int enc_free(BIO *a)
88	0	{
89	0	BIO_ENC_CTX *b;
90	0
91	0	if (a == NULL)
92	0	return 0;
93	0
94	0	b = BIO_get_data(a);
95	0	if (b == NULL)
96	0	return 0;
97	0
98	0	EVP_CIPHER_CTX_free(b->cipher);
99	0	OPENSSL_clear_free(b, sizeof(BIO_ENC_CTX));
100	0	BIO_set_data(a, NULL);
101	0	BIO_set_init(a, 0);
102	0
103	0	return 1;
104	0	}
105
106		static int enc_read(BIO b, char out, int outl)
107	0	{
108	0	int ret = 0, i, blocksize;
109	0	BIO_ENC_CTX *ctx;
110	0	BIO *next;
111	0
112	0	if (out == NULL)
113	0	return 0;
114	0	ctx = BIO_get_data(b);
115	0
116	0	next = BIO_next(b);
117	0	if ((ctx == NULL) \|\| (next == NULL))
118	0	return 0;
119	0
120	0	/* First check if there are bytes decoded/encoded */
121	0	if (ctx->buf_len > 0) {
122	0	i = ctx->buf_len - ctx->buf_off;
123	0	if (i > outl)
124	0	i = outl;
125	0	memcpy(out, &(ctx->buf[ctx->buf_off]), i);
126	0	ret = i;
127	0	out += i;
128	0	outl -= i;
129	0	ctx->buf_off += i;
130	0	if (ctx->buf_len == ctx->buf_off) {
131	0	ctx->buf_len = 0;
132	0	ctx->buf_off = 0;
133	0	}
134	0	}
135	0
136	0	blocksize = EVP_CIPHER_CTX_block_size(ctx->cipher);
137	0	if (blocksize == 1)
138	0	blocksize = 0;
139	0
140	0	/*
141	0	* At this point, we have room of outl bytes and an empty buffer, so we
142	0	* should read in some more.
143	0	*/
144	0
145	0	while (outl > 0) {
146	0	if (ctx->cont <= 0)
147	0	break;
148	0
149	0	if (ctx->read_start == ctx->read_end) { /* time to read more data */
150	0	ctx->read_end = ctx->read_start = &(ctx->buf[BUF_OFFSET]);
151	0	i = BIO_read(next, ctx->read_start, ENC_BLOCK_SIZE);
152	0	if (i > 0)
153	0	ctx->read_end += i;
154	0	} else {
155	0	i = ctx->read_end - ctx->read_start;
156	0	}
157	0
158	0	if (i <= 0) {
159	0	/* Should be continue next time we are called? */
160	0	if (!BIO_should_retry(next)) {
161	0	ctx->cont = i;
162	0	i = EVP_CipherFinal_ex(ctx->cipher,
163	0	ctx->buf, &(ctx->buf_len));
164	0	ctx->ok = i;
165	0	ctx->buf_off = 0;
166	0	} else {
167	0	ret = (ret == 0) ? i : ret;
168	0	break;
169	0	}
170	0	} else {
171	0	if (outl > ENC_MIN_CHUNK) {
172	0	/*
173	0	* Depending on flags block cipher decrypt can write
174	0	* one extra block and then back off, i.e. output buffer
175	0	* has to accommodate extra block...
176	0	*/
177	0	int j = outl - blocksize, buf_len;
178	0
179	0	if (!EVP_CipherUpdate(ctx->cipher,
180	0	(unsigned char *)out, &buf_len,
181	0	ctx->read_start, i > j ? j : i)) {
182	0	BIO_clear_retry_flags(b);
183	0	return 0;
184	0	}
185	0	ret += buf_len;
186	0	out += buf_len;
187	0	outl -= buf_len;
188	0
189	0	if ((i -= j) <= 0) {
190	0	ctx->read_start = ctx->read_end;
191	0	continue;
192	0	}
193	0	ctx->read_start += j;
194	0	}
195	0	if (i > ENC_MIN_CHUNK)
196	0	i = ENC_MIN_CHUNK;
197	0	if (!EVP_CipherUpdate(ctx->cipher,
198	0	ctx->buf, &ctx->buf_len,
199	0	ctx->read_start, i)) {
200	0	BIO_clear_retry_flags(b);
201	0	ctx->ok = 0;
202	0	return 0;
203	0	}
204	0	ctx->read_start += i;
205	0	ctx->cont = 1;
206	0	/*
207	0	* Note: it is possible for EVP_CipherUpdate to decrypt zero
208	0	* bytes because this is or looks like the final block: if this
209	0	* happens we should retry and either read more data or decrypt
210	0	* the final block
211	0	*/
212	0	if (ctx->buf_len == 0)
213	0	continue;
214	0	}
215	0
216	0	if (ctx->buf_len <= outl)
217	0	i = ctx->buf_len;
218	0	else
219	0	i = outl;
220	0	if (i <= 0)
221	0	break;
222	0	memcpy(out, ctx->buf, i);
223	0	ret += i;
224	0	ctx->buf_off = i;
225	0	outl -= i;
226	0	out += i;
227	0	}
228	0
229	0	BIO_clear_retry_flags(b);
230	0	BIO_copy_next_retry(b);
231	0	return ((ret == 0) ? ctx->cont : ret);
232	0	}
233
234		static int enc_write(BIO b, const char in, int inl)
235	0	{
236	0	int ret = 0, n, i;
237	0	BIO_ENC_CTX *ctx;
238	0	BIO *next;
239	0
240	0	ctx = BIO_get_data(b);
241	0	next = BIO_next(b);
242	0	if ((ctx == NULL) \|\| (next == NULL))
243	0	return 0;
244	0
245	0	ret = inl;
246	0
247	0	BIO_clear_retry_flags(b);
248	0	n = ctx->buf_len - ctx->buf_off;
249	0	while (n > 0) {
250	0	i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
251	0	if (i <= 0) {
252	0	BIO_copy_next_retry(b);
253	0	return i;
254	0	}
255	0	ctx->buf_off += i;
256	0	n -= i;
257	0	}
258	0	/* at this point all pending data has been written */
259	0
260	0	if ((in == NULL) \|\| (inl <= 0))
261	0	return 0;
262	0
263	0	ctx->buf_off = 0;
264	0	while (inl > 0) {
265	0	n = (inl > ENC_BLOCK_SIZE) ? ENC_BLOCK_SIZE : inl;
266	0	if (!EVP_CipherUpdate(ctx->cipher,
267	0	ctx->buf, &ctx->buf_len,
268	0	(const unsigned char *)in, n)) {
269	0	BIO_clear_retry_flags(b);
270	0	ctx->ok = 0;
271	0	return 0;
272	0	}
273	0	inl -= n;
274	0	in += n;
275	0
276	0	ctx->buf_off = 0;
277	0	n = ctx->buf_len;
278	0	while (n > 0) {
279	0	i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
280	0	if (i <= 0) {
281	0	BIO_copy_next_retry(b);
282	0	return (ret == inl) ? i : ret - inl;
283	0	}
284	0	n -= i;
285	0	ctx->buf_off += i;
286	0	}
287	0	ctx->buf_len = 0;
288	0	ctx->buf_off = 0;
289	0	}
290	0	BIO_copy_next_retry(b);
291	0	return ret;
292	0	}
293
294		static long enc_ctrl(BIO b, int cmd, long num, void ptr)
295	0	{
296	0	BIO *dbio;
297	0	BIO_ENC_CTX ctx, dctx;
298	0	long ret = 1;
299	0	int i;
300	0	EVP_CIPHER_CTX **c_ctx;
301	0	BIO *next;
302	0
303	0	ctx = BIO_get_data(b);
304	0	next = BIO_next(b);
305	0	if (ctx == NULL)
306	0	return 0;
307	0
308	0	switch (cmd) {
309	0	case BIO_CTRL_RESET:
310	0	ctx->ok = 1;
311	0	ctx->finished = 0;
312	0	if (!EVP_CipherInit_ex(ctx->cipher, NULL, NULL, NULL, NULL,
313	0	EVP_CIPHER_CTX_encrypting(ctx->cipher)))
314	0	return 0;
315	0	ret = BIO_ctrl(next, cmd, num, ptr);
316	0	break;
317	0	case BIO_CTRL_EOF: /* More to read */
318	0	if (ctx->cont <= 0)
319	0	ret = 1;
320	0	else
321	0	ret = BIO_ctrl(next, cmd, num, ptr);
322	0	break;
323	0	case BIO_CTRL_WPENDING:
324	0	ret = ctx->buf_len - ctx->buf_off;
325	0	if (ret <= 0)
326	0	ret = BIO_ctrl(next, cmd, num, ptr);
327	0	break;
328	0	case BIO_CTRL_PENDING: /* More to read in buffer */
329	0	ret = ctx->buf_len - ctx->buf_off;
330	0	if (ret <= 0)
331	0	ret = BIO_ctrl(next, cmd, num, ptr);
332	0	break;
333	0	case BIO_CTRL_FLUSH:
334	0	/* do a final write */
335	0	again:
336	0	while (ctx->buf_len != ctx->buf_off) {
337	0	i = enc_write(b, NULL, 0);
338	0	if (i < 0)
339	0	return i;
340	0	}
341	0
342	0	if (!ctx->finished) {
343	0	ctx->finished = 1;
344	0	ctx->buf_off = 0;
345	0	ret = EVP_CipherFinal_ex(ctx->cipher,
346	0	(unsigned char *)ctx->buf,
347	0	&(ctx->buf_len));
348	0	ctx->ok = (int)ret;
349	0	if (ret <= 0)
350	0	break;
351	0
352	0	/* push out the bytes */
353	0	goto again;
354	0	}
355	0
356	0	/* Finally flush the underlying BIO */
357	0	ret = BIO_ctrl(next, cmd, num, ptr);
358	0	break;
359	0	case BIO_C_GET_CIPHER_STATUS:
360	0	ret = (long)ctx->ok;
361	0	break;
362	0	case BIO_C_DO_STATE_MACHINE:
363	0	BIO_clear_retry_flags(b);
364	0	ret = BIO_ctrl(next, cmd, num, ptr);
365	0	BIO_copy_next_retry(b);
366	0	break;
367	0	case BIO_C_GET_CIPHER_CTX:
368	0	c_ctx = (EVP_CIPHER_CTX **)ptr;
369	0	*c_ctx = ctx->cipher;
370	0	BIO_set_init(b, 1);
371	0	break;
372	0	case BIO_CTRL_DUP:
373	0	dbio = (BIO *)ptr;
374	0	dctx = BIO_get_data(dbio);
375	0	dctx->cipher = EVP_CIPHER_CTX_new();
376	0	if (dctx->cipher == NULL)
377	0	return 0;
378	0	ret = EVP_CIPHER_CTX_copy(dctx->cipher, ctx->cipher);
379	0	if (ret)
380	0	BIO_set_init(dbio, 1);
381	0	break;
382	0	default:
383	0	ret = BIO_ctrl(next, cmd, num, ptr);
384	0	break;
385	0	}
386	0	return ret;
387	0	}
388
389		static long enc_callback_ctrl(BIO b, int cmd, BIO_info_cb fp)
390	0	{
391	0	long ret = 1;
392	0	BIO *next = BIO_next(b);
393	0
394	0	if (next == NULL)
395	0	return 0;
396	0	switch (cmd) {
397	0	default:
398	0	ret = BIO_callback_ctrl(next, cmd, fp);
399	0	break;
400	0	}
401	0	return ret;
402	0	}
403
404		int BIO_set_cipher(BIO b, const EVP_CIPHER c, const unsigned char *k,
405		const unsigned char *i, int e)
406	0	{
407	0	BIO_ENC_CTX *ctx;
408	0	long (callback) (struct bio_st , int, const char *, int, long, long);
409	0
410	0	ctx = BIO_get_data(b);
411	0	if (ctx == NULL)
412	0	return 0;
413	0
414	0	callback = BIO_get_callback(b);
415	0
416	0	if ((callback != NULL) &&
417	0	(callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e,
418	0	0L) <= 0))
419	0	return 0;
420	0
421	0	BIO_set_init(b, 1);
422	0
423	0	if (!EVP_CipherInit_ex(ctx->cipher, c, NULL, k, i, e))
424	0	return 0;
425	0
426	0	if (callback != NULL)
427	0	return callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, 1L);
428	0	return 1;
429	0	}