/src/openssl30/crypto/evp/bio_b64.c

Source
/*
 * 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: 2025-12-31 06:58

Line	Count	Source
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	16.1k	#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		const BIO_METHOD *BIO_f_base64(void)
62	12.3k	{
63	12.3k	return &methods_b64;
64	12.3k	}
65
66		static int b64_new(BIO *bi)
67	12.3k	{
68	12.3k	BIO_B64_CTX *ctx;
69
70	12.3k	if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) {
71	0	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
72	0	return 0;
73	0	}
74
75	12.3k	ctx->cont = 1;
76	12.3k	ctx->start = 1;
77	12.3k	ctx->base64 = EVP_ENCODE_CTX_new();
78	12.3k	if (ctx->base64 == NULL) {
79	0	OPENSSL_free(ctx);
80	0	return 0;
81	0	}
82
83	12.3k	BIO_set_data(bi, ctx);
84	12.3k	BIO_set_init(bi, 1);
85
86	12.3k	return 1;
87	12.3k	}
88
89		static int b64_free(BIO *a)
90	12.3k	{
91	12.3k	BIO_B64_CTX *ctx;
92	12.3k	if (a == NULL)
93	0	return 0;
94
95	12.3k	ctx = BIO_get_data(a);
96	12.3k	if (ctx == NULL)
97	0	return 0;
98
99	12.3k	EVP_ENCODE_CTX_free(ctx->base64);
100	12.3k	OPENSSL_free(ctx);
101	12.3k	BIO_set_data(a, NULL);
102	12.3k	BIO_set_init(a, 0);
103
104	12.3k	return 1;
105	12.3k	}
106
107		static int b64_read(BIO b, char out, int outl)
108		{
109		int ret = 0, i, ii, j, k, x, n, num, ret_code = 0;
110		BIO_B64_CTX *ctx;
111		unsigned char p, q;
112		BIO *next;
113
114		if (out == NULL)
115		return 0;
116		ctx = (BIO_B64_CTX *)BIO_get_data(b);
117
118		next = BIO_next(b);
119		if ((ctx == NULL) \|\| (next == NULL))
120		return 0;
121
122		BIO_clear_retry_flags(b);
123
124		if (ctx->encode != B64_DECODE) {
125		ctx->encode = B64_DECODE;
126		ctx->buf_len = 0;
127		ctx->buf_off = 0;
128		ctx->tmp_len = 0;
129		EVP_DecodeInit(ctx->base64);
130		}
131
132		/* First check if there are bytes decoded/encoded */
133		if (ctx->buf_len > 0) {
134		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
135		i = ctx->buf_len - ctx->buf_off;
136		if (i > outl)
137		i = outl;
138		OPENSSL_assert(ctx->buf_off + i < (int)sizeof(ctx->buf));
139		memcpy(out, &(ctx->buf[ctx->buf_off]), i);
140		ret = i;
141		out += i;
142		outl -= i;
143		ctx->buf_off += i;
144		if (ctx->buf_len == ctx->buf_off) {
145		ctx->buf_len = 0;
146		ctx->buf_off = 0;
147		}
148		}
149
150		/*
151		* At this point, we have room of outl bytes and an empty buffer, so we
152		* should read in some more.
153		*/
154
155		ret_code = 0;
156		while (outl > 0) {
157		if (ctx->cont <= 0)
158		break;
159
160		i = BIO_read(next, &(ctx->tmp[ctx->tmp_len]),
161		B64_BLOCK_SIZE - ctx->tmp_len);
162
163		if (i <= 0) {
164		ret_code = i;
165
166		/* Should we continue next time we are called? */
167		if (!BIO_should_retry(next)) {
168		ctx->cont = i;
169		/* If buffer empty break */
170		if (ctx->tmp_len == 0)
171		break;
172		/* Fall through and process what we have */
173		else
174		i = 0;
175		}
176		/* else we retry and add more data to buffer */
177		else
178		break;
179		}
180		i += ctx->tmp_len;
181		ctx->tmp_len = i;
182
183		/*
184		* We need to scan, a line at a time until we have a valid line if we
185		* are starting.
186		*/
187		if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)) {
188		/* ctx->start=1; */
189		ctx->tmp_len = 0;
190		} else if (ctx->start) {
191		q = p = (unsigned char *)ctx->tmp;
192		num = 0;
193		for (j = 0; j < i; j++) {
194		if (*(q++) != '\n')
195		continue;
196
197		/*
198		* due to a previous very long line, we need to keep on
199		* scanning for a '\n' before we even start looking for
200		* base64 encoded stuff.
201		*/
202		if (ctx->tmp_nl) {
203		p = q;
204		ctx->tmp_nl = 0;
205		continue;
206		}
207
208		k = EVP_DecodeUpdate(ctx->base64,
209		(unsigned char *)ctx->buf,
210		&num, p, q - p);
211		if ((k <= 0) && (num == 0) && (ctx->start))
212		EVP_DecodeInit(ctx->base64);
213		else {
214		if (p != (unsigned char *)&(ctx->tmp[0])) {
215		i -= (p - (unsigned char *)&(ctx->tmp[0]));
216		for (x = 0; x < i; x++)
217		ctx->tmp[x] = p[x];
218		}
219		EVP_DecodeInit(ctx->base64);
220		ctx->start = 0;
221		break;
222		}
223		p = q;
224		}
225
226		/* we fell off the end without starting */
227		if ((j == i) && (num == 0)) {
228		/*
229		* Is this is one long chunk?, if so, keep on reading until a
230		* new line.
231		*/
232		if (p == (unsigned char *)&(ctx->tmp[0])) {
233		/* Check buffer full */
234		if (i == B64_BLOCK_SIZE) {
235		ctx->tmp_nl = 1;
236		ctx->tmp_len = 0;
237		}
238		} else if (p != q) { /* finished on a '\n' */
239		n = q - p;
240		for (ii = 0; ii < n; ii++)
241		ctx->tmp[ii] = p[ii];
242		ctx->tmp_len = n;
243		}
244		/* else finished on a '\n' */
245		continue;
246		} else {
247		ctx->tmp_len = 0;
248		}
249		} else if ((i < B64_BLOCK_SIZE) && (ctx->cont > 0)) {
250		/*
251		* If buffer isn't full and we can retry then restart to read in
252		* more data.
253		*/
254		continue;
255		}
256
257		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
258		int z, jj;
259
260		jj = i & ~3; /* process per 4 */
261		z = EVP_DecodeBlock((unsigned char *)ctx->buf,
262		(unsigned char *)ctx->tmp, jj);
263		if (jj > 2) {
264		if (ctx->tmp[jj - 1] == '=') {
265		z--;
266		if (ctx->tmp[jj - 2] == '=')
267		z--;
268		}
269		}
270		/*
271		* z is now number of output bytes and jj is the number consumed
272		*/
273		if (jj != i) {
274		memmove(ctx->tmp, &ctx->tmp[jj], i - jj);
275		ctx->tmp_len = i - jj;
276		}
277		ctx->buf_len = 0;
278		if (z > 0) {
279		ctx->buf_len = z;
280		}
281		i = z;
282		} else {
283		i = EVP_DecodeUpdate(ctx->base64,
284		(unsigned char *)ctx->buf, &ctx->buf_len,
285		(unsigned char *)ctx->tmp, i);
286		ctx->tmp_len = 0;
287		}
288		/*
289		* If eof or an error was signalled, then the condition
290		* 'ctx->cont <= 0' will prevent b64_read() from reading
291		* more data on subsequent calls. This assignment was
292		* deleted accidentally in commit 5562cfaca4f3.
293		*/
294		ctx->cont = i;
295
296		ctx->buf_off = 0;
297		if (i < 0) {
298		ret_code = 0;
299		ctx->buf_len = 0;
300		break;
301		}
302
303		if (ctx->buf_len <= outl)
304		i = ctx->buf_len;
305		else
306		i = outl;
307
308		memcpy(out, ctx->buf, i);
309		ret += i;
310		ctx->buf_off = i;
311		if (ctx->buf_off == ctx->buf_len) {
312		ctx->buf_len = 0;
313		ctx->buf_off = 0;
314		}
315		outl -= i;
316		out += i;
317		}
318		/* BIO_clear_retry_flags(b); */
319		BIO_copy_next_retry(b);
320		return ((ret == 0) ? ret_code : ret);
321		}
322
323		static int b64_write(BIO b, const char in, int inl)
324		{
325		int ret = 0;
326		int n;
327		int i;
328		BIO_B64_CTX *ctx;
329		BIO *next;
330
331		ctx = (BIO_B64_CTX *)BIO_get_data(b);
332		next = BIO_next(b);
333		if ((ctx == NULL) \|\| (next == NULL))
334		return 0;
335
336		BIO_clear_retry_flags(b);
337
338		if (ctx->encode != B64_ENCODE) {
339		ctx->encode = B64_ENCODE;
340		ctx->buf_len = 0;
341		ctx->buf_off = 0;
342		ctx->tmp_len = 0;
343		EVP_EncodeInit(ctx->base64);
344		}
345
346		OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
347		OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
348		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
349		n = ctx->buf_len - ctx->buf_off;
350		while (n > 0) {
351		i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
352		if (i <= 0) {
353		BIO_copy_next_retry(b);
354		return i;
355		}
356		OPENSSL_assert(i <= n);
357		ctx->buf_off += i;
358		OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
359		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
360		n -= i;
361		}
362		/* at this point all pending data has been written */
363		ctx->buf_off = 0;
364		ctx->buf_len = 0;
365
366		if ((in == NULL) \|\| (inl <= 0))
367		return 0;
368
369		while (inl > 0) {
370		n = (inl > B64_BLOCK_SIZE) ? B64_BLOCK_SIZE : inl;
371
372		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
373		if (ctx->tmp_len > 0) {
374		OPENSSL_assert(ctx->tmp_len <= 3);
375		n = 3 - ctx->tmp_len;
376		/*
377		* There's a theoretical possibility for this
378		*/
379		if (n > inl)
380		n = inl;
381		memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
382		ctx->tmp_len += n;
383		ret += n;
384		if (ctx->tmp_len < 3)
385		break;
386		ctx->buf_len = EVP_EncodeBlock((unsigned char *)ctx->buf,
387		(unsigned char *)ctx->tmp, ctx->tmp_len);
388		OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
389		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
390		/*
391		* Since we're now done using the temporary buffer, the
392		* length should be 0'd
393		*/
394		ctx->tmp_len = 0;
395		} else {
396		if (n < 3) {
397		memcpy(ctx->tmp, in, n);
398		ctx->tmp_len = n;
399		ret += n;
400		break;
401		}
402		n -= n % 3;
403		ctx->buf_len = EVP_EncodeBlock((unsigned char *)ctx->buf,
404		(const unsigned char *)in, n);
405		OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
406		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
407		ret += n;
408		}
409		} else {
410		if (!EVP_EncodeUpdate(ctx->base64,
411		(unsigned char *)ctx->buf, &ctx->buf_len,
412		(unsigned char *)in, n))
413		return ((ret == 0) ? -1 : ret);
414		OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
415		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
416		ret += n;
417		}
418		inl -= n;
419		in += n;
420
421		ctx->buf_off = 0;
422		n = ctx->buf_len;
423		while (n > 0) {
424		i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
425		if (i <= 0) {
426		BIO_copy_next_retry(b);
427		return ((ret == 0) ? i : ret);
428		}
429		OPENSSL_assert(i <= n);
430		n -= i;
431		ctx->buf_off += i;
432		OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
433		OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
434		}
435		ctx->buf_len = 0;
436		ctx->buf_off = 0;
437		}
438		return ret;
439		}
440
441		static long b64_ctrl(BIO b, int cmd, long num, void ptr)
442	22.9k	{
443	22.9k	BIO_B64_CTX *ctx;
444	22.9k	long ret = 1;
445	22.9k	int i;
446	22.9k	BIO *next;
447
448	22.9k	ctx = (BIO_B64_CTX *)BIO_get_data(b);
449	22.9k	next = BIO_next(b);
450	22.9k	if ((ctx == NULL) \|\| (next == NULL))
451	0	return 0;
452
453	22.9k	switch (cmd) {
454	0	case BIO_CTRL_RESET:
455	0	ctx->cont = 1;
456	0	ctx->start = 1;
457	0	ctx->encode = B64_NONE;
458	0	ret = BIO_ctrl(next, cmd, num, ptr);
459	0	break;
460	0	case BIO_CTRL_EOF: /* More to read */
461	0	if (ctx->cont <= 0)
462	0	ret = 1;
463	0	else
464	0	ret = BIO_ctrl(next, cmd, num, ptr);
465	0	break;
466	0	case BIO_CTRL_WPENDING: /* More to write in buffer */
467	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
468	0	ret = ctx->buf_len - ctx->buf_off;
469	0	if ((ret == 0) && (ctx->encode != B64_NONE)
470	0	&& (EVP_ENCODE_CTX_num(ctx->base64) != 0))
471	0	ret = 1;
472	0	else if (ret <= 0)
473	0	ret = BIO_ctrl(next, cmd, num, ptr);
474	0	break;
475	0	case BIO_CTRL_PENDING: /* More to read in buffer */
476	0	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
477	0	ret = ctx->buf_len - ctx->buf_off;
478	0	if (ret <= 0)
479	0	ret = BIO_ctrl(next, cmd, num, ptr);
480	0	break;
481	7.64k	case BIO_CTRL_FLUSH:
482		/* do a final write */
483	8.09k	again:
484	11.7k	while (ctx->buf_len != ctx->buf_off) {
485	3.63k	i = b64_write(b, NULL, 0);
486	3.63k	if (i < 0)
487	0	return i;
488	3.63k	}
489	8.09k	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
490	0	if (ctx->tmp_len != 0) {
491	0	ctx->buf_len = EVP_EncodeBlock((unsigned char *)ctx->buf,
492	0	(unsigned char *)ctx->tmp,
493	0	ctx->tmp_len);
494	0	ctx->buf_off = 0;
495	0	ctx->tmp_len = 0;
496	0	goto again;
497	0	}
498	8.09k	} else if (ctx->encode != B64_NONE
499	8.09k	&& EVP_ENCODE_CTX_num(ctx->base64) != 0) {
500	442	ctx->buf_off = 0;
501	442	EVP_EncodeFinal(ctx->base64,
502	442	(unsigned char *)ctx->buf, &(ctx->buf_len));
503		/* push out the bytes */
504	442	goto again;
505	442	}
506		/* Finally flush the underlying BIO */
507	7.64k	ret = BIO_ctrl(next, cmd, num, ptr);
508	7.64k	break;
509
510	0	case BIO_C_DO_STATE_MACHINE:
511	0	BIO_clear_retry_flags(b);
512	0	ret = BIO_ctrl(next, cmd, num, ptr);
513	0	BIO_copy_next_retry(b);
514	0	break;
515
516	0	case BIO_CTRL_DUP:
517	0	break;
518	0	case BIO_CTRL_INFO:
519	0	case BIO_CTRL_GET:
520	0	case BIO_CTRL_SET:
521	15.2k	default:
522	15.2k	ret = BIO_ctrl(next, cmd, num, ptr);
523	15.2k	break;
524	22.9k	}
525	22.9k	return ret;
526	22.9k	}
527
528		static long b64_callback_ctrl(BIO b, int cmd, BIO_info_cb fp)
529	0	{
530	0	BIO *next = BIO_next(b);
531
532	0	if (next == NULL)
533	0	return 0;
534
535	0	return BIO_callback_ctrl(next, cmd, fp);
536	0	}
537
538		static int b64_puts(BIO b, const char str)
539	0	{
540	0	return b64_write(b, str, strlen(str));
541	0	}