/src/openssl/crypto/evp/bio_b64.c

Source (jump to first uncovered line)
/*
 * Copyright 1995-2023 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
 */

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

static int b64_write(BIO *h, const char *buf, int num);
static int b64_read(BIO *h, char *buf, int size);
static int b64_puts(BIO *h, const char *str);
static long b64_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int b64_new(BIO *h);
static int b64_free(BIO *data);
static long b64_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
#define B64_BLOCK_SIZE  1024
#define B64_BLOCK_SIZE2 768
#define B64_NONE        0
#define B64_ENCODE      1
#define B64_DECODE      2

typedef struct b64_struct {
    /*
     * BIO *bio; moved to the BIO structure
     */
    int buf_len;
    int buf_off;
    int tmp_len;                /* used to find the start when decoding */
    int tmp_nl;                 /* If true, scan until '\n' */
    int encode;
    int start;                  /* have we started decoding yet? */
    int cont;                   /* <= 0 when finished */
    EVP_ENCODE_CTX *base64;
    unsigned char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE) + 10];
    unsigned char tmp[B64_BLOCK_SIZE];
} BIO_B64_CTX;

static const BIO_METHOD methods_b64 = {
    BIO_TYPE_BASE64,
    "base64 encoding",
    bwrite_conv,
    b64_write,
    bread_conv,
    b64_read,
    b64_puts,
    NULL,                       /* b64_gets, */
    b64_ctrl,
    b64_new,
    b64_free,
    b64_callback_ctrl,
};

const BIO_METHOD *BIO_f_base64(void)
{
    return &methods_b64;
}

static int b64_new(BIO *bi)
{
    BIO_B64_CTX *ctx;

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

    ctx->cont = 1;
    ctx->start = 1;
    ctx->base64 = EVP_ENCODE_CTX_new();
    if (ctx->base64 == NULL) {
        OPENSSL_free(ctx);
        return 0;
    }

    BIO_set_data(bi, ctx);
    BIO_set_init(bi, 1);

    return 1;
}

static int b64_free(BIO *a)
{
    BIO_B64_CTX *ctx;

    if (a == NULL)
        return 0;

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

    EVP_ENCODE_CTX_free(ctx->base64);
    OPENSSL_free(ctx);
    BIO_set_data(a, NULL);
    BIO_set_init(a, 0);

    return 1;
}

static int b64_read(BIO *b, char *out, int outl)
{
    int ret = 0, i, ii, j, k, x, n, num, ret_code = 0;
    BIO_B64_CTX *ctx;
    unsigned char *p, *q;
    BIO *next;

    if (out == NULL)
        return 0;
    ctx = (BIO_B64_CTX *)BIO_get_data(b);

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

    BIO_clear_retry_flags(b);

    if (ctx->encode != B64_DECODE) {
        ctx->encode = B64_DECODE;
        ctx->buf_len = 0;
        ctx->buf_off = 0;
        ctx->tmp_len = 0;
        EVP_DecodeInit(ctx->base64);
    }

    /* First check if there are bytes decoded/encoded */
    if (ctx->buf_len > 0) {
        OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
        i = ctx->buf_len - ctx->buf_off;
        if (i > outl)
            i = outl;
        OPENSSL_assert(ctx->buf_off + i < (int)sizeof(ctx->buf));
        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.
     */

    ret_code = 0;
    while (outl > 0) {
        if (ctx->cont <= 0)
            break;

        i = BIO_read(next, &(ctx->tmp[ctx->tmp_len]),
                     B64_BLOCK_SIZE - ctx->tmp_len);

        if (i <= 0) {
            ret_code = i;

            /* Should we continue next time we are called? */
            if (!BIO_should_retry(next)) {
                ctx->cont = i;
                /* If buffer empty break */
                if (ctx->tmp_len == 0)
                    break;
                /* Fall through and process what we have */
                else
                    i = 0;
            }
            /* else we retry and add more data to buffer */
            else
                break;
        }
        i += ctx->tmp_len;
        ctx->tmp_len = i;

        /*
         * We need to scan, a line at a time until we have a valid line if we
         * are starting.
         */
        if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) != 0) {
            ctx->tmp_len = 0;
        } else if (ctx->start) {
            q = p = ctx->tmp;
            num = 0;
            for (j = 0; j < i; j++) {
                if (*(q++) != '\n')
                    continue;

                /*
                 * due to a previous very long line, we need to keep on
                 * scanning for a '\n' before we even start looking for
                 * base64 encoded stuff.
                 */
                if (ctx->tmp_nl) {
                    p = q;
                    ctx->tmp_nl = 0;
                    continue;
                }

                k = EVP_DecodeUpdate(ctx->base64, ctx->buf, &num, p, q - p);
                if (k <= 0 && num == 0 && ctx->start) {
                    EVP_DecodeInit(ctx->base64);
                } else {
                    if (p != ctx->tmp) {
                        i -= p - ctx->tmp;
                        for (x = 0; x < i; x++)
                            ctx->tmp[x] = p[x];
                    }
                    EVP_DecodeInit(ctx->base64);
                    ctx->start = 0;
                    break;
                }
                p = q;
            }

            /* we fell off the end without starting */
            if (j == i && num == 0) {
                /*
                 * Is this is one long chunk?, if so, keep on reading until a
                 * new line.
                 */
                if (p == ctx->tmp) {
                    /* Check buffer full */
                    if (i == B64_BLOCK_SIZE) {
                        ctx->tmp_nl = 1;
                        ctx->tmp_len = 0;
                    }
                } else if (p != q) { /* finished on a '\n' */
                    n = q - p;
                    for (ii = 0; ii < n; ii++)
                        ctx->tmp[ii] = p[ii];
                    ctx->tmp_len = n;
                }
                /* else finished on a '\n' */
                continue;
            } else {
                ctx->tmp_len = 0;
            }
        } else if (i < B64_BLOCK_SIZE && ctx->cont > 0) {
            /*
             * If buffer isn't full and we can retry then restart to read in
             * more data.
             */
            continue;
        }

        if ((BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) != 0) {
            int z, jj;

            jj = i & ~3;        /* process per 4 */
            z = EVP_DecodeBlock(ctx->buf, ctx->tmp, jj);
            if (jj > 2) {
                if (ctx->tmp[jj - 1] == '=') {
                    z--;
                    if (ctx->tmp[jj - 2] == '=')
                        z--;
                }
            }
            /*
             * z is now number of output bytes and jj is the number consumed
             */
            if (jj != i) {
                memmove(ctx->tmp, &ctx->tmp[jj], i - jj);
                ctx->tmp_len = i - jj;
            }
            ctx->buf_len = 0;
            if (z > 0) {
                ctx->buf_len = z;
            }
            i = z;
        } else {
            i = EVP_DecodeUpdate(ctx->base64, ctx->buf, &ctx->buf_len,
                                 ctx->tmp, i);
            ctx->tmp_len = 0;
        }
        /*
         * If eof or an error was signalled, then the condition
         * 'ctx->cont <= 0' will prevent b64_read() from reading
         * more data on subsequent calls. This assignment was
         * deleted accidentally in commit 5562cfaca4f3.
         */
        ctx->cont = i;

        ctx->buf_off = 0;
        if (i < 0) {
            ret_code = 0;
            ctx->buf_len = 0;
            break;
        }

        if (ctx->buf_len <= outl)
            i = ctx->buf_len;
        else
            i = outl;

        memcpy(out, ctx->buf, i);
        ret += i;
        ctx->buf_off = i;
        if (ctx->buf_off == ctx->buf_len) {
            ctx->buf_len = 0;
            ctx->buf_off = 0;
        }
        outl -= i;
        out += i;
    }
    /* BIO_clear_retry_flags(b); */
    BIO_copy_next_retry(b);
    return ret == 0 ? ret_code : ret;
}

static int b64_write(BIO *b, const char *in, int inl)
{
    int ret = 0;
    int n;
    int i;
    BIO_B64_CTX *ctx;
    BIO *next;

    ctx = (BIO_B64_CTX *)BIO_get_data(b);
    next = BIO_next(b);
    if (ctx == NULL || next == NULL)
        return 0;

    BIO_clear_retry_flags(b);

    if (ctx->encode != B64_ENCODE) {
        ctx->encode = B64_ENCODE;
        ctx->buf_len = 0;
        ctx->buf_off = 0;
        ctx->tmp_len = 0;
        EVP_EncodeInit(ctx->base64);
    }

    OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
    OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
    OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
    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;
        }
        OPENSSL_assert(i <= n);
        ctx->buf_off += i;
        OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
        OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
        n -= i;
    }
    /* at this point all pending data has been written */
    ctx->buf_off = 0;
    ctx->buf_len = 0;

    if (in == NULL || inl <= 0)
        return 0;

    while (inl > 0) {
        n = inl > B64_BLOCK_SIZE ? B64_BLOCK_SIZE : inl;

        if ((BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) != 0) {
            if (ctx->tmp_len > 0) {
                OPENSSL_assert(ctx->tmp_len <= 3);
                n = 3 - ctx->tmp_len;
                /*
                 * There's a theoretical possibility for this
                 */
                if (n > inl)
                    n = inl;
                memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
                ctx->tmp_len += n;
                ret += n;
                if (ctx->tmp_len < 3)
                    break;
                ctx->buf_len =
                    EVP_EncodeBlock(ctx->buf, ctx->tmp, ctx->tmp_len);
                OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
                OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
                /*
                 * Since we're now done using the temporary buffer, the
                 * length should be 0'd
                 */
                ctx->tmp_len = 0;
            } else {
                if (n < 3) {
                    memcpy(ctx->tmp, in, n);
                    ctx->tmp_len = n;
                    ret += n;
                    break;
                }
                n -= n % 3;
                ctx->buf_len =
                    EVP_EncodeBlock(ctx->buf, (unsigned char *)in, n);
                OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
                OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
                ret += n;
            }
        } else {
            if (!EVP_EncodeUpdate(ctx->base64, ctx->buf, &ctx->buf_len,
                                  (unsigned char *)in, n))
                return ret == 0 ? -1 : ret;
            OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
            OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
            ret += n;
        }
        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 == 0 ? i : ret;
            }
            OPENSSL_assert(i <= n);
            n -= i;
            ctx->buf_off += i;
            OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
            OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
        }
        ctx->buf_len = 0;
        ctx->buf_off = 0;
    }
    return ret;
}

static long b64_ctrl(BIO *b, int cmd, long num, void *ptr)
{
    BIO_B64_CTX *ctx;
    long ret = 1;
    int i;
    BIO *next;

    ctx = (BIO_B64_CTX *)BIO_get_data(b);
    next = BIO_next(b);
    if (ctx == NULL || next == NULL)
        return 0;

    switch (cmd) {
    case BIO_CTRL_RESET:
        ctx->cont = 1;
        ctx->start = 1;
        ctx->encode = B64_NONE;
        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:    /* More to write in buffer */
        OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
        ret = ctx->buf_len - ctx->buf_off;
        if (ret == 0 && ctx->encode != B64_NONE
            && EVP_ENCODE_CTX_num(ctx->base64) != 0)
            ret = 1;
        else if (ret <= 0)
            ret = BIO_ctrl(next, cmd, num, ptr);
        break;
    case BIO_CTRL_PENDING:     /* More to read in buffer */
        OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
        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 = b64_write(b, NULL, 0);
            if (i < 0)
                return i;
        }
        if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
            if (ctx->tmp_len != 0) {
                ctx->buf_len = EVP_EncodeBlock(ctx->buf,
                                               ctx->tmp, ctx->tmp_len);
                ctx->buf_off = 0;
                ctx->tmp_len = 0;
                goto again;
            }
        } else if (ctx->encode != B64_NONE
                   && EVP_ENCODE_CTX_num(ctx->base64) != 0) {
            ctx->buf_off = 0;
            EVP_EncodeFinal(ctx->base64, ctx->buf, &(ctx->buf_len));
            /* 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_DO_STATE_MACHINE:
        BIO_clear_retry_flags(b);
        ret = BIO_ctrl(next, cmd, num, ptr);
        BIO_copy_next_retry(b);
        break;

    case BIO_CTRL_DUP:
        break;
    case BIO_CTRL_INFO:
    case BIO_CTRL_GET:
    case BIO_CTRL_SET:
    default:
        ret = BIO_ctrl(next, cmd, num, ptr);
        break;
    }
    return ret;
}

static long b64_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);
}

static int b64_puts(BIO *b, const char *str)
{
    return b64_write(b, str, strlen(str));
}

Coverage Report

Created: 2023-09-25 06:41

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 1995-2023 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		#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 b64_write(BIO h, const char buf, int num);
18		static int b64_read(BIO h, char buf, int size);
19		static int b64_puts(BIO h, const char str);
20		static long b64_ctrl(BIO h, int cmd, long arg1, void arg2);
21		static int b64_new(BIO *h);
22		static int b64_free(BIO *data);
23		static long b64_callback_ctrl(BIO h, int cmd, BIO_info_cb fp);
24	0	#define B64_BLOCK_SIZE 1024
25		#define B64_BLOCK_SIZE2 768
26	0	#define B64_NONE 0
27	0	#define B64_ENCODE 1
28	0	#define B64_DECODE 2
29
30		typedef struct b64_struct {
31		/*
32		* BIO *bio; moved to the BIO structure
33		*/
34		int buf_len;
35		int buf_off;
36		int tmp_len; /* used to find the start when decoding */
37		int tmp_nl; /* If true, scan until '\n' */
38		int encode;
39		int start; /* have we started decoding yet? */
40		int cont; /* <= 0 when finished */
41		EVP_ENCODE_CTX *base64;
42		unsigned char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE) + 10];
43		unsigned char tmp[B64_BLOCK_SIZE];
44		} BIO_B64_CTX;
45
46		static const BIO_METHOD methods_b64 = {
47		BIO_TYPE_BASE64,
48		"base64 encoding",
49		bwrite_conv,
50		b64_write,
51		bread_conv,
52		b64_read,
53		b64_puts,
54		NULL, /* b64_gets, */
55		b64_ctrl,
56		b64_new,
57		b64_free,
58		b64_callback_ctrl,
59		};
60
61		const BIO_METHOD *BIO_f_base64(void)
62	0	{
63	0	return &methods_b64;
64	0	}
65
66		static int b64_new(BIO *bi)
67	0	{
68	0	BIO_B64_CTX *ctx;
69
70	0	if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL)
71	0	return 0;
72
73	0	ctx->cont = 1;
74	0	ctx->start = 1;
75	0	ctx->base64 = EVP_ENCODE_CTX_new();
76	0	if (ctx->base64 == NULL) {
77	0	OPENSSL_free(ctx);
78	0	return 0;
79	0	}
80
81	0	BIO_set_data(bi, ctx);
82	0	BIO_set_init(bi, 1);
83
84	0	return 1;
85	0	}
86
87		static int b64_free(BIO *a)
88	0	{
89	0	BIO_B64_CTX *ctx;
90
91	0	if (a == NULL)
92	0	return 0;
93
94	0	ctx = BIO_get_data(a);
95	0	if (ctx == NULL)
96	0	return 0;
97
98	0	EVP_ENCODE_CTX_free(ctx->base64);
99	0	OPENSSL_free(ctx);
100	0	BIO_set_data(a, NULL);
101	0	BIO_set_init(a, 0);
102
103	0	return 1;
104	0	}
105
106		static int b64_read(BIO b, char out, int outl)
107	0	{
108	0	int ret = 0, i, ii, j, k, x, n, num, ret_code = 0;
109	0	BIO_B64_CTX *ctx;
110	0	unsigned char p, q;
111	0	BIO *next;
112
113	0	if (out == NULL)
114	0	return 0;
115	0	ctx = (BIO_B64_CTX *)BIO_get_data(b);
116
117	0	next = BIO_next(b);
118	0	if (ctx == NULL \|\| next == NULL)
119	0	return 0;
120
121	0	BIO_clear_retry_flags(b);
122
123	0	if (ctx->encode != B64_DECODE) {
124	0	ctx->encode = B64_DECODE;
125	0	ctx->buf_len = 0;
126	0	ctx->buf_off = 0;
127	0	ctx->tmp_len = 0;
128	0	EVP_DecodeInit(ctx->base64);
129	0	}
130
131		/* First check if there are bytes decoded/encoded */
132	0	if (ctx->buf_len > 0) {
133	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
134	0	i = ctx->buf_len - ctx->buf_off;
135	0	if (i > outl)
136	0	i = outl;
137	0	OPENSSL_assert(ctx->buf_off + i < (int)sizeof(ctx->buf));
138	0	memcpy(out, &(ctx->buf[ctx->buf_off]), i);
139	0	ret = i;
140	0	out += i;
141	0	outl -= i;
142	0	ctx->buf_off += i;
143	0	if (ctx->buf_len == ctx->buf_off) {
144	0	ctx->buf_len = 0;
145	0	ctx->buf_off = 0;
146	0	}
147	0	}
148
149		/*
150		* At this point, we have room of outl bytes and an empty buffer, so we
151		* should read in some more.
152		*/
153
154	0	ret_code = 0;
155	0	while (outl > 0) {
156	0	if (ctx->cont <= 0)
157	0	break;
158
159	0	i = BIO_read(next, &(ctx->tmp[ctx->tmp_len]),
160	0	B64_BLOCK_SIZE - ctx->tmp_len);
161
162	0	if (i <= 0) {
163	0	ret_code = i;
164
165		/* Should we continue next time we are called? */
166	0	if (!BIO_should_retry(next)) {
167	0	ctx->cont = i;
168		/* If buffer empty break */
169	0	if (ctx->tmp_len == 0)
170	0	break;
171		/* Fall through and process what we have */
172	0	else
173	0	i = 0;
174	0	}
175		/* else we retry and add more data to buffer */
176	0	else
177	0	break;
178	0	}
179	0	i += ctx->tmp_len;
180	0	ctx->tmp_len = i;
181
182		/*
183		* We need to scan, a line at a time until we have a valid line if we
184		* are starting.
185		*/
186	0	if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) != 0) {
187	0	ctx->tmp_len = 0;
188	0	} else if (ctx->start) {
189	0	q = p = ctx->tmp;
190	0	num = 0;
191	0	for (j = 0; j < i; j++) {
192	0	if (*(q++) != '\n')
193	0	continue;
194
195		/*
196		* due to a previous very long line, we need to keep on
197		* scanning for a '\n' before we even start looking for
198		* base64 encoded stuff.
199		*/
200	0	if (ctx->tmp_nl) {
201	0	p = q;
202	0	ctx->tmp_nl = 0;
203	0	continue;
204	0	}
205
206	0	k = EVP_DecodeUpdate(ctx->base64, ctx->buf, &num, p, q - p);
207	0	if (k <= 0 && num == 0 && ctx->start) {
208	0	EVP_DecodeInit(ctx->base64);
209	0	} else {
210	0	if (p != ctx->tmp) {
211	0	i -= p - ctx->tmp;
212	0	for (x = 0; x < i; x++)
213	0	ctx->tmp[x] = p[x];
214	0	}
215	0	EVP_DecodeInit(ctx->base64);
216	0	ctx->start = 0;
217	0	break;
218	0	}
219	0	p = q;
220	0	}
221
222		/* we fell off the end without starting */
223	0	if (j == i && num == 0) {
224		/*
225		* Is this is one long chunk?, if so, keep on reading until a
226		* new line.
227		*/
228	0	if (p == ctx->tmp) {
229		/* Check buffer full */
230	0	if (i == B64_BLOCK_SIZE) {
231	0	ctx->tmp_nl = 1;
232	0	ctx->tmp_len = 0;
233	0	}
234	0	} else if (p != q) { /* finished on a '\n' */
235	0	n = q - p;
236	0	for (ii = 0; ii < n; ii++)
237	0	ctx->tmp[ii] = p[ii];
238	0	ctx->tmp_len = n;
239	0	}
240		/* else finished on a '\n' */
241	0	continue;
242	0	} else {
243	0	ctx->tmp_len = 0;
244	0	}
245	0	} else if (i < B64_BLOCK_SIZE && ctx->cont > 0) {
246		/*
247		* If buffer isn't full and we can retry then restart to read in
248		* more data.
249		*/
250	0	continue;
251	0	}
252
253	0	if ((BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) != 0) {
254	0	int z, jj;
255
256	0	jj = i & ~3; /* process per 4 */
257	0	z = EVP_DecodeBlock(ctx->buf, ctx->tmp, jj);
258	0	if (jj > 2) {
259	0	if (ctx->tmp[jj - 1] == '=') {
260	0	z--;
261	0	if (ctx->tmp[jj - 2] == '=')
262	0	z--;
263	0	}
264	0	}
265		/*
266		* z is now number of output bytes and jj is the number consumed
267		*/
268	0	if (jj != i) {
269	0	memmove(ctx->tmp, &ctx->tmp[jj], i - jj);
270	0	ctx->tmp_len = i - jj;
271	0	}
272	0	ctx->buf_len = 0;
273	0	if (z > 0) {
274	0	ctx->buf_len = z;
275	0	}
276	0	i = z;
277	0	} else {
278	0	i = EVP_DecodeUpdate(ctx->base64, ctx->buf, &ctx->buf_len,
279	0	ctx->tmp, i);
280	0	ctx->tmp_len = 0;
281	0	}
282		/*
283		* If eof or an error was signalled, then the condition
284		* 'ctx->cont <= 0' will prevent b64_read() from reading
285		* more data on subsequent calls. This assignment was
286		* deleted accidentally in commit 5562cfaca4f3.
287		*/
288	0	ctx->cont = i;
289
290	0	ctx->buf_off = 0;
291	0	if (i < 0) {
292	0	ret_code = 0;
293	0	ctx->buf_len = 0;
294	0	break;
295	0	}
296
297	0	if (ctx->buf_len <= outl)
298	0	i = ctx->buf_len;
299	0	else
300	0	i = outl;
301
302	0	memcpy(out, ctx->buf, i);
303	0	ret += i;
304	0	ctx->buf_off = i;
305	0	if (ctx->buf_off == ctx->buf_len) {
306	0	ctx->buf_len = 0;
307	0	ctx->buf_off = 0;
308	0	}
309	0	outl -= i;
310	0	out += i;
311	0	}
312		/* BIO_clear_retry_flags(b); */
313	0	BIO_copy_next_retry(b);
314	0	return ret == 0 ? ret_code : ret;
315	0	}
316
317		static int b64_write(BIO b, const char in, int inl)
318	0	{
319	0	int ret = 0;
320	0	int n;
321	0	int i;
322	0	BIO_B64_CTX *ctx;
323	0	BIO *next;
324
325	0	ctx = (BIO_B64_CTX *)BIO_get_data(b);
326	0	next = BIO_next(b);
327	0	if (ctx == NULL \|\| next == NULL)
328	0	return 0;
329
330	0	BIO_clear_retry_flags(b);
331
332	0	if (ctx->encode != B64_ENCODE) {
333	0	ctx->encode = B64_ENCODE;
334	0	ctx->buf_len = 0;
335	0	ctx->buf_off = 0;
336	0	ctx->tmp_len = 0;
337	0	EVP_EncodeInit(ctx->base64);
338	0	}
339
340	0	OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
341	0	OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
342	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
343	0	n = ctx->buf_len - ctx->buf_off;
344	0	while (n > 0) {
345	0	i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
346	0	if (i <= 0) {
347	0	BIO_copy_next_retry(b);
348	0	return i;
349	0	}
350	0	OPENSSL_assert(i <= n);
351	0	ctx->buf_off += i;
352	0	OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
353	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
354	0	n -= i;
355	0	}
356		/* at this point all pending data has been written */
357	0	ctx->buf_off = 0;
358	0	ctx->buf_len = 0;
359
360	0	if (in == NULL \|\| inl <= 0)
361	0	return 0;
362
363	0	while (inl > 0) {
364	0	n = inl > B64_BLOCK_SIZE ? B64_BLOCK_SIZE : inl;
365
366	0	if ((BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) != 0) {
367	0	if (ctx->tmp_len > 0) {
368	0	OPENSSL_assert(ctx->tmp_len <= 3);
369	0	n = 3 - ctx->tmp_len;
370		/*
371		* There's a theoretical possibility for this
372		*/
373	0	if (n > inl)
374	0	n = inl;
375	0	memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
376	0	ctx->tmp_len += n;
377	0	ret += n;
378	0	if (ctx->tmp_len < 3)
379	0	break;
380	0	ctx->buf_len =
381	0	EVP_EncodeBlock(ctx->buf, ctx->tmp, ctx->tmp_len);
382	0	OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
383	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
384		/*
385		* Since we're now done using the temporary buffer, the
386		* length should be 0'd
387		*/
388	0	ctx->tmp_len = 0;
389	0	} else {
390	0	if (n < 3) {
391	0	memcpy(ctx->tmp, in, n);
392	0	ctx->tmp_len = n;
393	0	ret += n;
394	0	break;
395	0	}
396	0	n -= n % 3;
397	0	ctx->buf_len =
398	0	EVP_EncodeBlock(ctx->buf, (unsigned char *)in, n);
399	0	OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
400	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
401	0	ret += n;
402	0	}
403	0	} else {
404	0	if (!EVP_EncodeUpdate(ctx->base64, ctx->buf, &ctx->buf_len,
405	0	(unsigned char *)in, n))
406	0	return ret == 0 ? -1 : ret;
407	0	OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
408	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
409	0	ret += n;
410	0	}
411	0	inl -= n;
412	0	in += n;
413
414	0	ctx->buf_off = 0;
415	0	n = ctx->buf_len;
416	0	while (n > 0) {
417	0	i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
418	0	if (i <= 0) {
419	0	BIO_copy_next_retry(b);
420	0	return ret == 0 ? i : ret;
421	0	}
422	0	OPENSSL_assert(i <= n);
423	0	n -= i;
424	0	ctx->buf_off += i;
425	0	OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
426	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
427	0	}
428	0	ctx->buf_len = 0;
429	0	ctx->buf_off = 0;
430	0	}
431	0	return ret;
432	0	}
433
434		static long b64_ctrl(BIO b, int cmd, long num, void ptr)
435	0	{
436	0	BIO_B64_CTX *ctx;
437	0	long ret = 1;
438	0	int i;
439	0	BIO *next;
440
441	0	ctx = (BIO_B64_CTX *)BIO_get_data(b);
442	0	next = BIO_next(b);
443	0	if (ctx == NULL \|\| next == NULL)
444	0	return 0;
445
446	0	switch (cmd) {
447	0	case BIO_CTRL_RESET:
448	0	ctx->cont = 1;
449	0	ctx->start = 1;
450	0	ctx->encode = B64_NONE;
451	0	ret = BIO_ctrl(next, cmd, num, ptr);
452	0	break;
453	0	case BIO_CTRL_EOF: /* More to read */
454	0	if (ctx->cont <= 0)
455	0	ret = 1;
456	0	else
457	0	ret = BIO_ctrl(next, cmd, num, ptr);
458	0	break;
459	0	case BIO_CTRL_WPENDING: /* More to write in buffer */
460	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
461	0	ret = ctx->buf_len - ctx->buf_off;
462	0	if (ret == 0 && ctx->encode != B64_NONE
463	0	&& EVP_ENCODE_CTX_num(ctx->base64) != 0)
464	0	ret = 1;
465	0	else if (ret <= 0)
466	0	ret = BIO_ctrl(next, cmd, num, ptr);
467	0	break;
468	0	case BIO_CTRL_PENDING: /* More to read in buffer */
469	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
470	0	ret = ctx->buf_len - ctx->buf_off;
471	0	if (ret <= 0)
472	0	ret = BIO_ctrl(next, cmd, num, ptr);
473	0	break;
474	0	case BIO_CTRL_FLUSH:
475		/* do a final write */
476	0	again:
477	0	while (ctx->buf_len != ctx->buf_off) {
478	0	i = b64_write(b, NULL, 0);
479	0	if (i < 0)
480	0	return i;
481	0	}
482	0	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
483	0	if (ctx->tmp_len != 0) {
484	0	ctx->buf_len = EVP_EncodeBlock(ctx->buf,
485	0	ctx->tmp, ctx->tmp_len);
486	0	ctx->buf_off = 0;
487	0	ctx->tmp_len = 0;
488	0	goto again;
489	0	}
490	0	} else if (ctx->encode != B64_NONE
491	0	&& EVP_ENCODE_CTX_num(ctx->base64) != 0) {
492	0	ctx->buf_off = 0;
493	0	EVP_EncodeFinal(ctx->base64, ctx->buf, &(ctx->buf_len));
494		/* push out the bytes */
495	0	goto again;
496	0	}
497		/* Finally flush the underlying BIO */
498	0	ret = BIO_ctrl(next, cmd, num, ptr);
499	0	BIO_copy_next_retry(b);
500	0	break;
501
502	0	case BIO_C_DO_STATE_MACHINE:
503	0	BIO_clear_retry_flags(b);
504	0	ret = BIO_ctrl(next, cmd, num, ptr);
505	0	BIO_copy_next_retry(b);
506	0	break;
507
508	0	case BIO_CTRL_DUP:
509	0	break;
510	0	case BIO_CTRL_INFO:
511	0	case BIO_CTRL_GET:
512	0	case BIO_CTRL_SET:
513	0	default:
514	0	ret = BIO_ctrl(next, cmd, num, ptr);
515	0	break;
516	0	}
517	0	return ret;
518	0	}
519
520		static long b64_callback_ctrl(BIO b, int cmd, BIO_info_cb fp)
521	0	{
522	0	BIO *next = BIO_next(b);
523
524	0	if (next == NULL)
525	0	return 0;
526
527	0	return BIO_callback_ctrl(next, cmd, fp);
528	0	}
529
530		static int b64_puts(BIO b, const char str)
531	0	{
532	0	return b64_write(b, str, strlen(str));
533	0	}