/src/openssl111/crypto/evp/bio_b64.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 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;
    char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE) + 10];
    char tmp[B64_BLOCK_SIZE];
} BIO_B64_CTX;

static const BIO_METHOD methods_b64 = {
    BIO_TYPE_BASE64,
    "base64 encoding",
    /* TODO: Convert to new style write function */
    bwrite_conv,
    b64_write,
    /* TODO: Convert to new style read function */
    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) {
        EVPerr(EVP_F_B64_NEW, ERR_R_MALLOC_FAILURE);
        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)) {
            /* ctx->start=1; */
            ctx->tmp_len = 0;
        } else if (ctx->start) {
            q = p = (unsigned char *)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,
                                     (unsigned char *)ctx->buf,
                                     &num, p, q - p);
                if ((k <= 0) && (num == 0) && (ctx->start))
                    EVP_DecodeInit(ctx->base64);
                else {
                    if (p != (unsigned char *)
                        &(ctx->tmp[0])) {
                        i -= (p - (unsigned char *)
                              &(ctx->tmp[0]));
                        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 == (unsigned char *)&(ctx->tmp[0])) {
                    /* 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) {
            int z, jj;

            jj = i & ~3;        /* process per 4 */
            z = EVP_DecodeBlock((unsigned char *)ctx->buf,
                                (unsigned char *)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,
                                 (unsigned char *)ctx->buf, &ctx->buf_len,
                                 (unsigned char *)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) {
            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((unsigned char *)ctx->buf,
                                    (unsigned char *)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((unsigned char *)ctx->buf,
                                    (const 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,
                                 (unsigned char *)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((unsigned char *)ctx->buf,
                                               (unsigned char *)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,
                            (unsigned char *)ctx->buf, &(ctx->buf_len));
            /* push out the bytes */
            goto again;
        }
        /* Finally flush the underlying BIO */
        ret = BIO_ctrl(next, cmd, num, ptr);
        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)
{
    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;
}

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

Coverage Report

Created: 2023-09-25 06:45

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 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		#define B64_BLOCK_SIZE 1024
25		#define B64_BLOCK_SIZE2 768
26	6.40k	#define B64_NONE 0
27		#define B64_ENCODE 1
28		#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		char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE) + 10];
43		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		/* TODO: Convert to new style write function */
50		bwrite_conv,
51		b64_write,
52		/* TODO: Convert to new style read function */
53		bread_conv,
54		b64_read,
55		b64_puts,
56		NULL, /* b64_gets, */
57		b64_ctrl,
58		b64_new,
59		b64_free,
60		b64_callback_ctrl,
61		};
62
63
64		const BIO_METHOD *BIO_f_base64(void)
65	2.98k	{
66	2.98k	return &methods_b64;
67	2.98k	}
68
69		static int b64_new(BIO *bi)
70	2.98k	{
71	2.98k	BIO_B64_CTX *ctx;
72
73	2.98k	if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) {
74	0	EVPerr(EVP_F_B64_NEW, ERR_R_MALLOC_FAILURE);
75	0	return 0;
76	0	}
77
78	2.98k	ctx->cont = 1;
79	2.98k	ctx->start = 1;
80	2.98k	ctx->base64 = EVP_ENCODE_CTX_new();
81	2.98k	if (ctx->base64 == NULL) {
82	0	OPENSSL_free(ctx);
83	0	return 0;
84	0	}
85
86	2.98k	BIO_set_data(bi, ctx);
87	2.98k	BIO_set_init(bi, 1);
88
89	2.98k	return 1;
90	2.98k	}
91
92		static int b64_free(BIO *a)
93	2.98k	{
94	2.98k	BIO_B64_CTX *ctx;
95	2.98k	if (a == NULL)
96	0	return 0;
97
98	2.98k	ctx = BIO_get_data(a);
99	2.98k	if (ctx == NULL)
100	0	return 0;
101
102	2.98k	EVP_ENCODE_CTX_free(ctx->base64);
103	2.98k	OPENSSL_free(ctx);
104	2.98k	BIO_set_data(a, NULL);
105	2.98k	BIO_set_init(a, 0);
106
107	2.98k	return 1;
108	2.98k	}
109
110		static int b64_read(BIO b, char out, int outl)
111		{
112		int ret = 0, i, ii, j, k, x, n, num, ret_code = 0;
113		BIO_B64_CTX *ctx;
114		unsigned char p, q;
115		BIO *next;
116
117		if (out == NULL)
118		return 0;
119		ctx = (BIO_B64_CTX *)BIO_get_data(b);
120
121		next = BIO_next(b);
122		if ((ctx == NULL) \|\| (next == NULL))
123		return 0;
124
125		BIO_clear_retry_flags(b);
126
127		if (ctx->encode != B64_DECODE) {
128		ctx->encode = B64_DECODE;
129		ctx->buf_len = 0;
130		ctx->buf_off = 0;
131		ctx->tmp_len = 0;
132		EVP_DecodeInit(ctx->base64);
133		}
134
135		/* First check if there are bytes decoded/encoded */
136		if (ctx->buf_len > 0) {
137		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
138		i = ctx->buf_len - ctx->buf_off;
139		if (i > outl)
140		i = outl;
141		OPENSSL_assert(ctx->buf_off + i < (int)sizeof(ctx->buf));
142		memcpy(out, &(ctx->buf[ctx->buf_off]), i);
143		ret = i;
144		out += i;
145		outl -= i;
146		ctx->buf_off += i;
147		if (ctx->buf_len == ctx->buf_off) {
148		ctx->buf_len = 0;
149		ctx->buf_off = 0;
150		}
151		}
152
153		/*
154		* At this point, we have room of outl bytes and an empty buffer, so we
155		* should read in some more.
156		*/
157
158		ret_code = 0;
159		while (outl > 0) {
160		if (ctx->cont <= 0)
161		break;
162
163		i = BIO_read(next, &(ctx->tmp[ctx->tmp_len]),
164		B64_BLOCK_SIZE - ctx->tmp_len);
165
166		if (i <= 0) {
167		ret_code = i;
168
169		/* Should we continue next time we are called? */
170		if (!BIO_should_retry(next)) {
171		ctx->cont = i;
172		/* If buffer empty break */
173		if (ctx->tmp_len == 0)
174		break;
175		/* Fall through and process what we have */
176		else
177		i = 0;
178		}
179		/* else we retry and add more data to buffer */
180		else
181		break;
182		}
183		i += ctx->tmp_len;
184		ctx->tmp_len = i;
185
186		/*
187		* We need to scan, a line at a time until we have a valid line if we
188		* are starting.
189		*/
190		if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)) {
191		/* ctx->start=1; */
192		ctx->tmp_len = 0;
193		} else if (ctx->start) {
194		q = p = (unsigned char *)ctx->tmp;
195		num = 0;
196		for (j = 0; j < i; j++) {
197		if (*(q++) != '\n')
198		continue;
199
200		/*
201		* due to a previous very long line, we need to keep on
202		* scanning for a '\n' before we even start looking for
203		* base64 encoded stuff.
204		*/
205		if (ctx->tmp_nl) {
206		p = q;
207		ctx->tmp_nl = 0;
208		continue;
209		}
210
211		k = EVP_DecodeUpdate(ctx->base64,
212		(unsigned char *)ctx->buf,
213		&num, p, q - p);
214		if ((k <= 0) && (num == 0) && (ctx->start))
215		EVP_DecodeInit(ctx->base64);
216		else {
217		if (p != (unsigned char *)
218		&(ctx->tmp[0])) {
219		i -= (p - (unsigned char *)
220		&(ctx->tmp[0]));
221		for (x = 0; x < i; x++)
222		ctx->tmp[x] = p[x];
223		}
224		EVP_DecodeInit(ctx->base64);
225		ctx->start = 0;
226		break;
227		}
228		p = q;
229		}
230
231		/* we fell off the end without starting */
232		if ((j == i) && (num == 0)) {
233		/*
234		* Is this is one long chunk?, if so, keep on reading until a
235		* new line.
236		*/
237		if (p == (unsigned char *)&(ctx->tmp[0])) {
238		/* Check buffer full */
239		if (i == B64_BLOCK_SIZE) {
240		ctx->tmp_nl = 1;
241		ctx->tmp_len = 0;
242		}
243		} else if (p != q) { /* finished on a '\n' */
244		n = q - p;
245		for (ii = 0; ii < n; ii++)
246		ctx->tmp[ii] = p[ii];
247		ctx->tmp_len = n;
248		}
249		/* else finished on a '\n' */
250		continue;
251		} else {
252		ctx->tmp_len = 0;
253		}
254		} else if ((i < B64_BLOCK_SIZE) && (ctx->cont > 0)) {
255		/*
256		* If buffer isn't full and we can retry then restart to read in
257		* more data.
258		*/
259		continue;
260		}
261
262		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
263		int z, jj;
264
265		jj = i & ~3; /* process per 4 */
266		z = EVP_DecodeBlock((unsigned char *)ctx->buf,
267		(unsigned char *)ctx->tmp, jj);
268		if (jj > 2) {
269		if (ctx->tmp[jj - 1] == '=') {
270		z--;
271		if (ctx->tmp[jj - 2] == '=')
272		z--;
273		}
274		}
275		/*
276		* z is now number of output bytes and jj is the number consumed
277		*/
278		if (jj != i) {
279		memmove(ctx->tmp, &ctx->tmp[jj], i - jj);
280		ctx->tmp_len = i - jj;
281		}
282		ctx->buf_len = 0;
283		if (z > 0) {
284		ctx->buf_len = z;
285		}
286		i = z;
287		} else {
288		i = EVP_DecodeUpdate(ctx->base64,
289		(unsigned char *)ctx->buf, &ctx->buf_len,
290		(unsigned char *)ctx->tmp, i);
291		ctx->tmp_len = 0;
292		}
293		/*
294		* If eof or an error was signalled, then the condition
295		* 'ctx->cont <= 0' will prevent b64_read() from reading
296		* more data on subsequent calls. This assignment was
297		* deleted accidentally in commit 5562cfaca4f3.
298		*/
299		ctx->cont = i;
300
301		ctx->buf_off = 0;
302		if (i < 0) {
303		ret_code = 0;
304		ctx->buf_len = 0;
305		break;
306		}
307
308		if (ctx->buf_len <= outl)
309		i = ctx->buf_len;
310		else
311		i = outl;
312
313		memcpy(out, ctx->buf, i);
314		ret += i;
315		ctx->buf_off = i;
316		if (ctx->buf_off == ctx->buf_len) {
317		ctx->buf_len = 0;
318		ctx->buf_off = 0;
319		}
320		outl -= i;
321		out += i;
322		}
323		/* BIO_clear_retry_flags(b); */
324		BIO_copy_next_retry(b);
325		return ((ret == 0) ? ret_code : ret);
326		}
327
328		static int b64_write(BIO b, const char in, int inl)
329		{
330		int ret = 0;
331		int n;
332		int i;
333		BIO_B64_CTX *ctx;
334		BIO *next;
335
336		ctx = (BIO_B64_CTX *)BIO_get_data(b);
337		next = BIO_next(b);
338		if ((ctx == NULL) \|\| (next == NULL))
339		return 0;
340
341		BIO_clear_retry_flags(b);
342
343		if (ctx->encode != B64_ENCODE) {
344		ctx->encode = B64_ENCODE;
345		ctx->buf_len = 0;
346		ctx->buf_off = 0;
347		ctx->tmp_len = 0;
348		EVP_EncodeInit(ctx->base64);
349		}
350
351		OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
352		OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
353		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
354		n = ctx->buf_len - ctx->buf_off;
355		while (n > 0) {
356		i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
357		if (i <= 0) {
358		BIO_copy_next_retry(b);
359		return i;
360		}
361		OPENSSL_assert(i <= n);
362		ctx->buf_off += i;
363		OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
364		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
365		n -= i;
366		}
367		/* at this point all pending data has been written */
368		ctx->buf_off = 0;
369		ctx->buf_len = 0;
370
371		if ((in == NULL) \|\| (inl <= 0))
372		return 0;
373
374		while (inl > 0) {
375		n = (inl > B64_BLOCK_SIZE) ? B64_BLOCK_SIZE : inl;
376
377		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
378		if (ctx->tmp_len > 0) {
379		OPENSSL_assert(ctx->tmp_len <= 3);
380		n = 3 - ctx->tmp_len;
381		/*
382		* There's a theoretical possibility for this
383		*/
384		if (n > inl)
385		n = inl;
386		memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
387		ctx->tmp_len += n;
388		ret += n;
389		if (ctx->tmp_len < 3)
390		break;
391		ctx->buf_len =
392		EVP_EncodeBlock((unsigned char *)ctx->buf,
393		(unsigned char *)ctx->tmp, ctx->tmp_len);
394		OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
395		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
396		/*
397		* Since we're now done using the temporary buffer, the
398		* length should be 0'd
399		*/
400		ctx->tmp_len = 0;
401		} else {
402		if (n < 3) {
403		memcpy(ctx->tmp, in, n);
404		ctx->tmp_len = n;
405		ret += n;
406		break;
407		}
408		n -= n % 3;
409		ctx->buf_len =
410		EVP_EncodeBlock((unsigned char *)ctx->buf,
411		(const unsigned char *)in, n);
412		OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
413		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
414		ret += n;
415		}
416		} else {
417		if (!EVP_EncodeUpdate(ctx->base64,
418		(unsigned char *)ctx->buf, &ctx->buf_len,
419		(unsigned char *)in, n))
420		return ((ret == 0) ? -1 : ret);
421		OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
422		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
423		ret += n;
424		}
425		inl -= n;
426		in += n;
427
428		ctx->buf_off = 0;
429		n = ctx->buf_len;
430		while (n > 0) {
431		i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
432		if (i <= 0) {
433		BIO_copy_next_retry(b);
434		return ((ret == 0) ? i : ret);
435		}
436		OPENSSL_assert(i <= n);
437		n -= i;
438		ctx->buf_off += i;
439		OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
440		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
441		}
442		ctx->buf_len = 0;
443		ctx->buf_off = 0;
444		}
445		return ret;
446		}
447
448		static long b64_ctrl(BIO b, int cmd, long num, void ptr)
449	8.94k	{
450	8.94k	BIO_B64_CTX *ctx;
451	8.94k	long ret = 1;
452	8.94k	int i;
453	8.94k	BIO *next;
454
455	8.94k	ctx = (BIO_B64_CTX *)BIO_get_data(b);
456	8.94k	next = BIO_next(b);
457	8.94k	if ((ctx == NULL) \|\| (next == NULL))
458	0	return 0;
459
460	8.94k	switch (cmd) {
461	0	case BIO_CTRL_RESET:
462	0	ctx->cont = 1;
463	0	ctx->start = 1;
464	0	ctx->encode = B64_NONE;
465	0	ret = BIO_ctrl(next, cmd, num, ptr);
466	0	break;
467	0	case BIO_CTRL_EOF: /* More to read */
468	0	if (ctx->cont <= 0)
469	0	ret = 1;
470	0	else
471	0	ret = BIO_ctrl(next, cmd, num, ptr);
472	0	break;
473	0	case BIO_CTRL_WPENDING: /* More to write in buffer */
474	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
475	0	ret = ctx->buf_len - ctx->buf_off;
476	0	if ((ret == 0) && (ctx->encode != B64_NONE)
477	0	&& (EVP_ENCODE_CTX_num(ctx->base64) != 0))
478	0	ret = 1;
479	0	else if (ret <= 0)
480	0	ret = BIO_ctrl(next, cmd, num, ptr);
481	0	break;
482	0	case BIO_CTRL_PENDING: /* More to read in buffer */
483	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
484	0	ret = ctx->buf_len - ctx->buf_off;
485	0	if (ret <= 0)
486	0	ret = BIO_ctrl(next, cmd, num, ptr);
487	0	break;
488	2.98k	case BIO_CTRL_FLUSH:
489		/* do a final write */
490	3.20k	again:
491	4.86k	while (ctx->buf_len != ctx->buf_off) {
492	1.65k	i = b64_write(b, NULL, 0);
493	1.65k	if (i < 0)
494	0	return i;
495	1.65k	}
496	3.20k	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
497	0	if (ctx->tmp_len != 0) {
498	0	ctx->buf_len = EVP_EncodeBlock((unsigned char *)ctx->buf,
499	0	(unsigned char *)ctx->tmp,
500	0	ctx->tmp_len);
501	0	ctx->buf_off = 0;
502	0	ctx->tmp_len = 0;
503	0	goto again;
504	0	}
505	3.20k	} else if (ctx->encode != B64_NONE
506	3.20k	&& EVP_ENCODE_CTX_num(ctx->base64) != 0) {
507	224	ctx->buf_off = 0;
508	224	EVP_EncodeFinal(ctx->base64,
509	224	(unsigned char *)ctx->buf, &(ctx->buf_len));
510		/* push out the bytes */
511	224	goto again;
512	224	}
513		/* Finally flush the underlying BIO */
514	2.98k	ret = BIO_ctrl(next, cmd, num, ptr);
515	2.98k	break;
516
517	0	case BIO_C_DO_STATE_MACHINE:
518	0	BIO_clear_retry_flags(b);
519	0	ret = BIO_ctrl(next, cmd, num, ptr);
520	0	BIO_copy_next_retry(b);
521	0	break;
522
523	0	case BIO_CTRL_DUP:
524	0	break;
525	0	case BIO_CTRL_INFO:
526	0	case BIO_CTRL_GET:
527	0	case BIO_CTRL_SET:
528	5.96k	default:
529	5.96k	ret = BIO_ctrl(next, cmd, num, ptr);
530	5.96k	break;
531	8.94k	}
532	8.94k	return ret;
533	8.94k	}
534
535		static long b64_callback_ctrl(BIO b, int cmd, BIO_info_cb fp)
536	0	{
537	0	long ret = 1;
538	0	BIO *next = BIO_next(b);
539
540	0	if (next == NULL)
541	0	return 0;
542	0	switch (cmd) {
543	0	default:
544	0	ret = BIO_callback_ctrl(next, cmd, fp);
545	0	break;
546	0	}
547	0	return ret;
548	0	}
549
550		static int b64_puts(BIO b, const char str)
551	0	{
552	0	return b64_write(b, str, strlen(str));
553	0	}