/src/openssl31/crypto/evp/bio_b64.c

Source (jump to first uncovered line)
/*
 * Copyright 1995-2021 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;
    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",
    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) {
        ERR_raise(ERR_LIB_EVP, 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)
{
    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: 2025-06-13 06:58

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 1995-2021 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		#define B64_BLOCK_SIZE 1024
25		#define B64_BLOCK_SIZE2 768
26	6.36k	#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		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
62		const BIO_METHOD *BIO_f_base64(void)
63	6.09k	{
64	6.09k	return &methods_b64;
65	6.09k	}
66
67		static int b64_new(BIO *bi)
68	6.09k	{
69	6.09k	BIO_B64_CTX *ctx;
70
71	6.09k	if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) {
72	0	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
73	0	return 0;
74	0	}
75
76	6.09k	ctx->cont = 1;
77	6.09k	ctx->start = 1;
78	6.09k	ctx->base64 = EVP_ENCODE_CTX_new();
79	6.09k	if (ctx->base64 == NULL) {
80	0	OPENSSL_free(ctx);
81	0	return 0;
82	0	}
83
84	6.09k	BIO_set_data(bi, ctx);
85	6.09k	BIO_set_init(bi, 1);
86
87	6.09k	return 1;
88	6.09k	}
89
90		static int b64_free(BIO *a)
91	6.09k	{
92	6.09k	BIO_B64_CTX *ctx;
93	6.09k	if (a == NULL)
94	0	return 0;
95
96	6.09k	ctx = BIO_get_data(a);
97	6.09k	if (ctx == NULL)
98	0	return 0;
99
100	6.09k	EVP_ENCODE_CTX_free(ctx->base64);
101	6.09k	OPENSSL_free(ctx);
102	6.09k	BIO_set_data(a, NULL);
103	6.09k	BIO_set_init(a, 0);
104
105	6.09k	return 1;
106	6.09k	}
107
108		static int b64_read(BIO b, char out, int outl)
109		{
110		int ret = 0, i, ii, j, k, x, n, num, ret_code = 0;
111		BIO_B64_CTX *ctx;
112		unsigned char p, q;
113		BIO *next;
114
115		if (out == NULL)
116		return 0;
117		ctx = (BIO_B64_CTX *)BIO_get_data(b);
118
119		next = BIO_next(b);
120		if ((ctx == NULL) \|\| (next == NULL))
121		return 0;
122
123		BIO_clear_retry_flags(b);
124
125		if (ctx->encode != B64_DECODE) {
126		ctx->encode = B64_DECODE;
127		ctx->buf_len = 0;
128		ctx->buf_off = 0;
129		ctx->tmp_len = 0;
130		EVP_DecodeInit(ctx->base64);
131		}
132
133		/* First check if there are bytes decoded/encoded */
134		if (ctx->buf_len > 0) {
135		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
136		i = ctx->buf_len - ctx->buf_off;
137		if (i > outl)
138		i = outl;
139		OPENSSL_assert(ctx->buf_off + i < (int)sizeof(ctx->buf));
140		memcpy(out, &(ctx->buf[ctx->buf_off]), i);
141		ret = i;
142		out += i;
143		outl -= i;
144		ctx->buf_off += i;
145		if (ctx->buf_len == ctx->buf_off) {
146		ctx->buf_len = 0;
147		ctx->buf_off = 0;
148		}
149		}
150
151		/*
152		* At this point, we have room of outl bytes and an empty buffer, so we
153		* should read in some more.
154		*/
155
156		ret_code = 0;
157		while (outl > 0) {
158		if (ctx->cont <= 0)
159		break;
160
161		i = BIO_read(next, &(ctx->tmp[ctx->tmp_len]),
162		B64_BLOCK_SIZE - ctx->tmp_len);
163
164		if (i <= 0) {
165		ret_code = i;
166
167		/* Should we continue next time we are called? */
168		if (!BIO_should_retry(next)) {
169		ctx->cont = i;
170		/* If buffer empty break */
171		if (ctx->tmp_len == 0)
172		break;
173		/* Fall through and process what we have */
174		else
175		i = 0;
176		}
177		/* else we retry and add more data to buffer */
178		else
179		break;
180		}
181		i += ctx->tmp_len;
182		ctx->tmp_len = i;
183
184		/*
185		* We need to scan, a line at a time until we have a valid line if we
186		* are starting.
187		*/
188		if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)) {
189		/* ctx->start=1; */
190		ctx->tmp_len = 0;
191		} else if (ctx->start) {
192		q = p = (unsigned char *)ctx->tmp;
193		num = 0;
194		for (j = 0; j < i; j++) {
195		if (*(q++) != '\n')
196		continue;
197
198		/*
199		* due to a previous very long line, we need to keep on
200		* scanning for a '\n' before we even start looking for
201		* base64 encoded stuff.
202		*/
203		if (ctx->tmp_nl) {
204		p = q;
205		ctx->tmp_nl = 0;
206		continue;
207		}
208
209		k = EVP_DecodeUpdate(ctx->base64,
210		(unsigned char *)ctx->buf,
211		&num, p, q - p);
212		if ((k <= 0) && (num == 0) && (ctx->start))
213		EVP_DecodeInit(ctx->base64);
214		else {
215		if (p != (unsigned char *)
216		&(ctx->tmp[0])) {
217		i -= (p - (unsigned char *)
218		&(ctx->tmp[0]));
219		for (x = 0; x < i; x++)
220		ctx->tmp[x] = p[x];
221		}
222		EVP_DecodeInit(ctx->base64);
223		ctx->start = 0;
224		break;
225		}
226		p = q;
227		}
228
229		/* we fell off the end without starting */
230		if ((j == i) && (num == 0)) {
231		/*
232		* Is this is one long chunk?, if so, keep on reading until a
233		* new line.
234		*/
235		if (p == (unsigned char *)&(ctx->tmp[0])) {
236		/* Check buffer full */
237		if (i == B64_BLOCK_SIZE) {
238		ctx->tmp_nl = 1;
239		ctx->tmp_len = 0;
240		}
241		} else if (p != q) { /* finished on a '\n' */
242		n = q - p;
243		for (ii = 0; ii < n; ii++)
244		ctx->tmp[ii] = p[ii];
245		ctx->tmp_len = n;
246		}
247		/* else finished on a '\n' */
248		continue;
249		} else {
250		ctx->tmp_len = 0;
251		}
252		} else if ((i < B64_BLOCK_SIZE) && (ctx->cont > 0)) {
253		/*
254		* If buffer isn't full and we can retry then restart to read in
255		* more data.
256		*/
257		continue;
258		}
259
260		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
261		int z, jj;
262
263		jj = i & ~3; /* process per 4 */
264		z = EVP_DecodeBlock((unsigned char *)ctx->buf,
265		(unsigned char *)ctx->tmp, jj);
266		if (jj > 2) {
267		if (ctx->tmp[jj - 1] == '=') {
268		z--;
269		if (ctx->tmp[jj - 2] == '=')
270		z--;
271		}
272		}
273		/*
274		* z is now number of output bytes and jj is the number consumed
275		*/
276		if (jj != i) {
277		memmove(ctx->tmp, &ctx->tmp[jj], i - jj);
278		ctx->tmp_len = i - jj;
279		}
280		ctx->buf_len = 0;
281		if (z > 0) {
282		ctx->buf_len = z;
283		}
284		i = z;
285		} else {
286		i = EVP_DecodeUpdate(ctx->base64,
287		(unsigned char *)ctx->buf, &ctx->buf_len,
288		(unsigned char *)ctx->tmp, i);
289		ctx->tmp_len = 0;
290		}
291		/*
292		* If eof or an error was signalled, then the condition
293		* 'ctx->cont <= 0' will prevent b64_read() from reading
294		* more data on subsequent calls. This assignment was
295		* deleted accidentally in commit 5562cfaca4f3.
296		*/
297		ctx->cont = i;
298
299		ctx->buf_off = 0;
300		if (i < 0) {
301		ret_code = 0;
302		ctx->buf_len = 0;
303		break;
304		}
305
306		if (ctx->buf_len <= outl)
307		i = ctx->buf_len;
308		else
309		i = outl;
310
311		memcpy(out, ctx->buf, i);
312		ret += i;
313		ctx->buf_off = i;
314		if (ctx->buf_off == ctx->buf_len) {
315		ctx->buf_len = 0;
316		ctx->buf_off = 0;
317		}
318		outl -= i;
319		out += i;
320		}
321		/* BIO_clear_retry_flags(b); */
322		BIO_copy_next_retry(b);
323		return ((ret == 0) ? ret_code : ret);
324		}
325
326		static int b64_write(BIO b, const char in, int inl)
327		{
328		int ret = 0;
329		int n;
330		int i;
331		BIO_B64_CTX *ctx;
332		BIO *next;
333
334		ctx = (BIO_B64_CTX *)BIO_get_data(b);
335		next = BIO_next(b);
336		if ((ctx == NULL) \|\| (next == NULL))
337		return 0;
338
339		BIO_clear_retry_flags(b);
340
341		if (ctx->encode != B64_ENCODE) {
342		ctx->encode = B64_ENCODE;
343		ctx->buf_len = 0;
344		ctx->buf_off = 0;
345		ctx->tmp_len = 0;
346		EVP_EncodeInit(ctx->base64);
347		}
348
349		OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
350		OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
351		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
352		n = ctx->buf_len - ctx->buf_off;
353		while (n > 0) {
354		i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
355		if (i <= 0) {
356		BIO_copy_next_retry(b);
357		return i;
358		}
359		OPENSSL_assert(i <= n);
360		ctx->buf_off += i;
361		OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
362		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
363		n -= i;
364		}
365		/* at this point all pending data has been written */
366		ctx->buf_off = 0;
367		ctx->buf_len = 0;
368
369		if ((in == NULL) \|\| (inl <= 0))
370		return 0;
371
372		while (inl > 0) {
373		n = (inl > B64_BLOCK_SIZE) ? B64_BLOCK_SIZE : inl;
374
375		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
376		if (ctx->tmp_len > 0) {
377		OPENSSL_assert(ctx->tmp_len <= 3);
378		n = 3 - ctx->tmp_len;
379		/*
380		* There's a theoretical possibility for this
381		*/
382		if (n > inl)
383		n = inl;
384		memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
385		ctx->tmp_len += n;
386		ret += n;
387		if (ctx->tmp_len < 3)
388		break;
389		ctx->buf_len =
390		EVP_EncodeBlock((unsigned char *)ctx->buf,
391		(unsigned char *)ctx->tmp, ctx->tmp_len);
392		OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
393		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
394		/*
395		* Since we're now done using the temporary buffer, the
396		* length should be 0'd
397		*/
398		ctx->tmp_len = 0;
399		} else {
400		if (n < 3) {
401		memcpy(ctx->tmp, in, n);
402		ctx->tmp_len = n;
403		ret += n;
404		break;
405		}
406		n -= n % 3;
407		ctx->buf_len =
408		EVP_EncodeBlock((unsigned char *)ctx->buf,
409		(const unsigned char *)in, n);
410		OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
411		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
412		ret += n;
413		}
414		} else {
415		if (!EVP_EncodeUpdate(ctx->base64,
416		(unsigned char *)ctx->buf, &ctx->buf_len,
417		(unsigned char *)in, n))
418		return ((ret == 0) ? -1 : ret);
419		OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
420		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
421		ret += n;
422		}
423		inl -= n;
424		in += n;
425
426		ctx->buf_off = 0;
427		n = ctx->buf_len;
428		while (n > 0) {
429		i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
430		if (i <= 0) {
431		BIO_copy_next_retry(b);
432		return ((ret == 0) ? i : ret);
433		}
434		OPENSSL_assert(i <= n);
435		n -= i;
436		ctx->buf_off += i;
437		OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
438		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
439		}
440		ctx->buf_len = 0;
441		ctx->buf_off = 0;
442		}
443		return ret;
444		}
445
446		static long b64_ctrl(BIO b, int cmd, long num, void ptr)
447	8.97k	{
448	8.97k	BIO_B64_CTX *ctx;
449	8.97k	long ret = 1;
450	8.97k	int i;
451	8.97k	BIO *next;
452
453	8.97k	ctx = (BIO_B64_CTX *)BIO_get_data(b);
454	8.97k	next = BIO_next(b);
455	8.97k	if ((ctx == NULL) \|\| (next == NULL))
456	0	return 0;
457
458	8.97k	switch (cmd) {
459	0	case BIO_CTRL_RESET:
460	0	ctx->cont = 1;
461	0	ctx->start = 1;
462	0	ctx->encode = B64_NONE;
463	0	ret = BIO_ctrl(next, cmd, num, ptr);
464	0	break;
465	0	case BIO_CTRL_EOF: /* More to read */
466	0	if (ctx->cont <= 0)
467	0	ret = 1;
468	0	else
469	0	ret = BIO_ctrl(next, cmd, num, ptr);
470	0	break;
471	0	case BIO_CTRL_WPENDING: /* More to write in buffer */
472	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
473	0	ret = ctx->buf_len - ctx->buf_off;
474	0	if ((ret == 0) && (ctx->encode != B64_NONE)
475	0	&& (EVP_ENCODE_CTX_num(ctx->base64) != 0))
476	0	ret = 1;
477	0	else if (ret <= 0)
478	0	ret = BIO_ctrl(next, cmd, num, ptr);
479	0	break;
480	0	case BIO_CTRL_PENDING: /* More to read in buffer */
481	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
482	0	ret = ctx->buf_len - ctx->buf_off;
483	0	if (ret <= 0)
484	0	ret = BIO_ctrl(next, cmd, num, ptr);
485	0	break;
486	2.99k	case BIO_CTRL_FLUSH:
487		/* do a final write */
488	3.18k	again:
489	4.67k	while (ctx->buf_len != ctx->buf_off) {
490	1.49k	i = b64_write(b, NULL, 0);
491	1.49k	if (i < 0)
492	0	return i;
493	1.49k	}
494	3.18k	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
495	0	if (ctx->tmp_len != 0) {
496	0	ctx->buf_len = EVP_EncodeBlock((unsigned char *)ctx->buf,
497	0	(unsigned char *)ctx->tmp,
498	0	ctx->tmp_len);
499	0	ctx->buf_off = 0;
500	0	ctx->tmp_len = 0;
501	0	goto again;
502	0	}
503	3.18k	} else if (ctx->encode != B64_NONE
504	3.18k	&& EVP_ENCODE_CTX_num(ctx->base64) != 0) {
505	193	ctx->buf_off = 0;
506	193	EVP_EncodeFinal(ctx->base64,
507	193	(unsigned char *)ctx->buf, &(ctx->buf_len));
508		/* push out the bytes */
509	193	goto again;
510	193	}
511		/* Finally flush the underlying BIO */
512	2.99k	ret = BIO_ctrl(next, cmd, num, ptr);
513	2.99k	break;
514
515	0	case BIO_C_DO_STATE_MACHINE:
516	0	BIO_clear_retry_flags(b);
517	0	ret = BIO_ctrl(next, cmd, num, ptr);
518	0	BIO_copy_next_retry(b);
519	0	break;
520
521	0	case BIO_CTRL_DUP:
522	0	break;
523	0	case BIO_CTRL_INFO:
524	0	case BIO_CTRL_GET:
525	0	case BIO_CTRL_SET:
526	5.98k	default:
527	5.98k	ret = BIO_ctrl(next, cmd, num, ptr);
528	5.98k	break;
529	8.97k	}
530	8.97k	return ret;
531	8.97k	}
532
533		static long b64_callback_ctrl(BIO b, int cmd, BIO_info_cb fp)
534	0	{
535	0	BIO *next = BIO_next(b);
536
537	0	if (next == NULL)
538	0	return 0;
539
540	0	return BIO_callback_ctrl(next, cmd, fp);
541	0	}
542
543		static int b64_puts(BIO b, const char str)
544	0	{
545	0	return b64_write(b, str, strlen(str));
546	0	}