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

Source (jump to first uncovered line)
/*
 * Copyright 1995-2024 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;
}

/*
 * Unless `BIO_FLAGS_BASE64_NO_NL` is set, this BIO ignores leading lines that
 * aren't exclusively composed of valid Base64 characters (followed by <CRLF>
 * or <LF>).  Once a valid Base64 line is found, `ctx->start` is set to 0 and
 * lines are processed until EOF or the first line that contains invalid Base64
 * characters.  In a nod to PEM, lines that start with a '-' (hyphen) are
 * treated as a soft EOF, rather than an error.
 */
static int b64_read(BIO *b, char *out, int outl)
{
    int ret = 0, i, ii, j, k, x, n, num, ret_code;
    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 buffered bytes already decoded */
    if (ctx->buf_len > 0) {
        if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
            ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
            return -1;
        }
        i = ctx->buf_len - ctx->buf_off;
        if (i > outl)
            i = outl;
        if (!ossl_assert(ctx->buf_off + i < (int)sizeof(ctx->buf))) {
            ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
            return -1;
        }
        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;
        }
    }

    /* Restore any non-retriable error condition (ctx->cont < 0) */
    ret_code = ctx->cont < 0 ? ctx->cont : 0;

    /*
     * At this point, we have room of outl bytes and an either an empty buffer,
     * or outl == 0, so we'll attempt to read in some more.
     */
    while (outl > 0) {
        int again = ctx->cont;

        if (again <= 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)) {
                /* Incomplete final Base64 chunk in the decoder is an error */
                if (ctx->tmp_len == 0) {
                    if (EVP_DecodeFinal(ctx->base64, NULL, &num) < 0)
                        ret_code = -1;
                    EVP_DecodeInit(ctx->base64);
                }
                ctx->cont = ret_code;
            }
            if (ctx->tmp_len == 0)
                break;
            /* Fall through and process what we have */
            i = 0;
            /* But don't loop to top-up even if the buffer is not full! */
            again = 0;
        }

        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, (int)(q - p));
                EVP_DecodeInit(ctx->base64);
                if (k <= 0 && num == 0) {
                    p = q;
                    continue;
                }

                ctx->start = 0;
                if (p != ctx->tmp) {
                    i -= (int)(p - ctx->tmp);
                    for (x = 0; x < i; x++)
                        ctx->tmp[x] = p[x];
                }
                break;
            }

            /* we fell off the end without starting */
            if (ctx->start) {
                /*
                 * 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) {
                    /* Retain partial line at end of buffer */
                    n = (int)(q - p);
                    for (ii = 0; ii < n; ii++)
                        ctx->tmp[ii] = p[ii];
                    ctx->tmp_len = n;
                } else {
                    /* All we have is newline terminated non-start data */
                    ctx->tmp_len = 0;
                }
                /*
                 * Try to read more if possible, otherwise we can't make
                 * progress unless the underlying BIO is retriable and may
                 * produce more data next time we're called.
                 */
                if (again > 0)
                    continue;
                else
                    break;
            } else {
                ctx->tmp_len = 0;
            }
        } else if (i < B64_BLOCK_SIZE && again > 0) {
            /*
             * If buffer isn't full and we can retry then restart to read in
             * more data.
             */
            continue;
        }

        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 = ctx->start ? 0 : i;
            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);
    }
    if (!ossl_assert(ctx->buf_off < (int)sizeof(ctx->buf))) {
        ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
        return -1;
    }
    if (!ossl_assert(ctx->buf_len <= (int)sizeof(ctx->buf))) {
        ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
        return -1;
    }
    if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
        ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
        return -1;
    }
    n = ctx->buf_len - ctx->buf_off;
    while (n > 0) {
        i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
        if (i <= 0) {
            BIO_copy_next_retry(b);
            return i;
        }
        ctx->buf_off += i;
        if (!ossl_assert(ctx->buf_off <= (int)sizeof(ctx->buf))) {
            ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
            return -1;
        }
        if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
            ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
            return -1;
        }
        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) {
                if (!ossl_assert(ctx->tmp_len <= 3)) {
                    ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
                    return ret == 0 ? -1 : ret;
                }
                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);
                if (!ossl_assert(ctx->buf_len <= (int)sizeof(ctx->buf))) {
                    ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
                    return ret == 0 ? -1 : ret;
                }
                if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
                    ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
                    return ret == 0 ? -1 : ret;
                }
                /*
                 * 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);
                if (!ossl_assert(ctx->buf_len <= (int)sizeof(ctx->buf))) {
                    ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
                    return ret == 0 ? -1 : ret;
                }
                if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
                    ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
                    return ret == 0 ? -1 : ret;
                }
                ret += n;
            }
        } else {
            if (!EVP_EncodeUpdate(ctx->base64, ctx->buf, &ctx->buf_len,
                                  (unsigned char *)in, n))
                return ret == 0 ? -1 : ret;
            if (!ossl_assert(ctx->buf_len <= (int)sizeof(ctx->buf))) {
                ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
                return ret == 0 ? -1 : ret;
            }
            if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
                ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
                return ret == 0 ? -1 : ret;
            }
            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;
            }
            n -= i;
            ctx->buf_off += i;
            if (!ossl_assert(ctx->buf_off <= (int)sizeof(ctx->buf))) {
                ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
                return ret == 0 ? -1 : ret;
            }
            if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
                ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
                return ret == 0 ? -1 : ret;
            }
        }
        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 */
        if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
            ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
            return -1;
        }
        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 */
        if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
            ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
            return -1;
        }
        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)
{
    size_t len = strlen(str);

    if (len > INT_MAX)
        return -1;
    return b64_write(b, str, (int)len);
}

Coverage Report

Created: 2025-08-11 07:04

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 1995-2024 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	117k	#define B64_BLOCK_SIZE 1024
25		#define B64_BLOCK_SIZE2 768
26	5.64k	#define B64_NONE 0
27	2.69k	#define B64_ENCODE 1
28	2.31M	#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	12.5k	{
63	12.5k	return &methods_b64;
64	12.5k	}
65
66		static int b64_new(BIO *bi)
67	12.5k	{
68	12.5k	BIO_B64_CTX *ctx;
69
70	12.5k	if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL)
71	0	return 0;
72
73	12.5k	ctx->cont = 1;
74	12.5k	ctx->start = 1;
75	12.5k	ctx->base64 = EVP_ENCODE_CTX_new();
76	12.5k	if (ctx->base64 == NULL) {
77	0	OPENSSL_free(ctx);
78	0	return 0;
79	0	}
80
81	12.5k	BIO_set_data(bi, ctx);
82	12.5k	BIO_set_init(bi, 1);
83
84	12.5k	return 1;
85	12.5k	}
86
87		static int b64_free(BIO *a)
88	12.5k	{
89	12.5k	BIO_B64_CTX *ctx;
90
91	12.5k	if (a == NULL)
92	0	return 0;
93
94	12.5k	ctx = BIO_get_data(a);
95	12.5k	if (ctx == NULL)
96	0	return 0;
97
98	12.5k	EVP_ENCODE_CTX_free(ctx->base64);
99	12.5k	OPENSSL_free(ctx);
100	12.5k	BIO_set_data(a, NULL);
101	12.5k	BIO_set_init(a, 0);
102
103	12.5k	return 1;
104	12.5k	}
105
106		/*
107		* Unless `BIO_FLAGS_BASE64_NO_NL` is set, this BIO ignores leading lines that
108		* aren't exclusively composed of valid Base64 characters (followed by <CRLF>
109		* or <LF>). Once a valid Base64 line is found, `ctx->start` is set to 0 and
110		* lines are processed until EOF or the first line that contains invalid Base64
111		* characters. In a nod to PEM, lines that start with a '-' (hyphen) are
112		* treated as a soft EOF, rather than an error.
113		*/
114		static int b64_read(BIO b, char out, int outl)
115	2.31M	{
116	2.31M	int ret = 0, i, ii, j, k, x, n, num, ret_code;
117	2.31M	BIO_B64_CTX *ctx;
118	2.31M	unsigned char p, q;
119	2.31M	BIO *next;
120
121	2.31M	if (out == NULL)
122	0	return 0;
123	2.31M	ctx = (BIO_B64_CTX *)BIO_get_data(b);
124
125	2.31M	next = BIO_next(b);
126	2.31M	if (ctx == NULL \|\| next == NULL)
127	0	return 0;
128
129	2.31M	BIO_clear_retry_flags(b);
130
131	2.31M	if (ctx->encode != B64_DECODE) {
132	2.75k	ctx->encode = B64_DECODE;
133	2.75k	ctx->buf_len = 0;
134	2.75k	ctx->buf_off = 0;
135	2.75k	ctx->tmp_len = 0;
136	2.75k	EVP_DecodeInit(ctx->base64);
137	2.75k	}
138
139		/* First check if there are buffered bytes already decoded */
140	2.31M	if (ctx->buf_len > 0) {
141	2.30M	if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
142	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
143	0	return -1;
144	0	}
145	2.30M	i = ctx->buf_len - ctx->buf_off;
146	2.30M	if (i > outl)
147	2.28M	i = outl;
148	2.30M	if (!ossl_assert(ctx->buf_off + i < (int)sizeof(ctx->buf))) {
149	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
150	0	return -1;
151	0	}
152	2.30M	memcpy(out, &(ctx->buf[ctx->buf_off]), i);
153	2.30M	ret = i;
154	2.30M	out += i;
155	2.30M	outl -= i;
156	2.30M	ctx->buf_off += i;
157	2.30M	if (ctx->buf_len == ctx->buf_off) {
158	22.3k	ctx->buf_len = 0;
159	22.3k	ctx->buf_off = 0;
160	22.3k	}
161	2.30M	}
162
163		/* Restore any non-retriable error condition (ctx->cont < 0) */
164	2.31M	ret_code = ctx->cont < 0 ? ctx->cont : 0;
165
166		/*
167		* At this point, we have room of outl bytes and an either an empty buffer,
168		* or outl == 0, so we'll attempt to read in some more.
169		*/
170	2.35M	while (outl > 0) {
171	43.5k	int again = ctx->cont;
172
173	43.5k	if (again <= 0)
174	934	break;
175
176	42.6k	i = BIO_read(next, &(ctx->tmp[ctx->tmp_len]),
177	42.6k	B64_BLOCK_SIZE - ctx->tmp_len);
178
179	42.6k	if (i <= 0) {
180	1.91k	ret_code = i;
181
182		/* Should we continue next time we are called? */
183	1.91k	if (!BIO_should_retry(next)) {
184		/* Incomplete final Base64 chunk in the decoder is an error */
185	1.91k	if (ctx->tmp_len == 0) {
186	786	if (EVP_DecodeFinal(ctx->base64, NULL, &num) < 0)
187	151	ret_code = -1;
188	786	EVP_DecodeInit(ctx->base64);
189	786	}
190	1.91k	ctx->cont = ret_code;
191	1.91k	}
192	1.91k	if (ctx->tmp_len == 0)
193	786	break;
194		/* Fall through and process what we have */
195	1.13k	i = 0;
196		/* But don't loop to top-up even if the buffer is not full! */
197	1.13k	again = 0;
198	1.13k	}
199
200	41.8k	i += ctx->tmp_len;
201	41.8k	ctx->tmp_len = i;
202
203		/*
204		* We need to scan, a line at a time until we have a valid line if we
205		* are starting.
206		*/
207	41.8k	if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) != 0) {
208	0	ctx->tmp_len = 0;
209	41.8k	} else if (ctx->start) {
210	4.74k	q = p = ctx->tmp;
211	4.74k	num = 0;
212	2.13M	for (j = 0; j < i; j++) {
213	2.13M	if (*(q++) != '\n')
214	2.03M	continue;
215
216		/*
217		* due to a previous very long line, we need to keep on
218		* scanning for a '\n' before we even start looking for
219		* base64 encoded stuff.
220		*/
221	98.2k	if (ctx->tmp_nl) {
222	621	p = q;
223	621	ctx->tmp_nl = 0;
224	621	continue;
225	621	}
226
227	97.5k	k = EVP_DecodeUpdate(ctx->base64, ctx->buf, &num, p, (int)(q - p));
228	97.5k	EVP_DecodeInit(ctx->base64);
229	97.5k	if (k <= 0 && num == 0) {
230	94.9k	p = q;
231	94.9k	continue;
232	94.9k	}
233
234	2.62k	ctx->start = 0;
235	2.62k	if (p != ctx->tmp) {
236	112	i -= (int)(p - ctx->tmp);
237	53.1k	for (x = 0; x < i; x++)
238	52.9k	ctx->tmp[x] = p[x];
239	112	}
240	2.62k	break;
241	97.5k	}
242
243		/* we fell off the end without starting */
244	4.74k	if (ctx->start) {
245		/*
246		* Is this is one long chunk?, if so, keep on reading until a
247		* new line.
248		*/
249	2.12k	if (p == ctx->tmp) {
250		/* Check buffer full */
251	930	if (i == B64_BLOCK_SIZE) {
252	825	ctx->tmp_nl = 1;
253	825	ctx->tmp_len = 0;
254	825	}
255	1.19k	} else if (p != q) {
256		/* Retain partial line at end of buffer */
257	946	n = (int)(q - p);
258	773k	for (ii = 0; ii < n; ii++)
259	772k	ctx->tmp[ii] = p[ii];
260	946	ctx->tmp_len = n;
261	946	} else {
262		/* All we have is newline terminated non-start data */
263	247	ctx->tmp_len = 0;
264	247	}
265		/*
266		* Try to read more if possible, otherwise we can't make
267		* progress unless the underlying BIO is retriable and may
268		* produce more data next time we're called.
269		*/
270	2.12k	if (again > 0)
271	2.05k	continue;
272	64	else
273	64	break;
274	2.62k	} else {
275	2.62k	ctx->tmp_len = 0;
276	2.62k	}
277	37.0k	} else if (i < B64_BLOCK_SIZE && again > 0) {
278		/*
279		* If buffer isn't full and we can retry then restart to read in
280		* more data.
281		*/
282	1.06k	continue;
283	1.06k	}
284
285	38.6k	i = EVP_DecodeUpdate(ctx->base64, ctx->buf, &ctx->buf_len,
286	38.6k	ctx->tmp, i);
287	38.6k	ctx->tmp_len = 0;
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	38.6k	ctx->cont = i;
295
296	38.6k	ctx->buf_off = 0;
297	38.6k	if (i < 0) {
298	87	ret_code = ctx->start ? 0 : i;
299	87	ctx->buf_len = 0;
300	87	break;
301	87	}
302
303	38.5k	if (ctx->buf_len <= outl)
304	14.9k	i = ctx->buf_len;
305	23.6k	else
306	23.6k	i = outl;
307
308	38.5k	memcpy(out, ctx->buf, i);
309	38.5k	ret += i;
310	38.5k	ctx->buf_off = i;
311	38.5k	if (ctx->buf_off == ctx->buf_len) {
312	14.9k	ctx->buf_len = 0;
313	14.9k	ctx->buf_off = 0;
314	14.9k	}
315	38.5k	outl -= i;
316	38.5k	out += i;
317	38.5k	}
318		/* BIO_clear_retry_flags(b); */
319	2.31M	BIO_copy_next_retry(b);
320	2.31M	return ret == 0 ? ret_code : ret;
321	2.31M	}
322
323		static int b64_write(BIO b, const char in, int inl)
324	1.34k	{
325	1.34k	int ret = 0;
326	1.34k	int n;
327	1.34k	int i;
328	1.34k	BIO_B64_CTX *ctx;
329	1.34k	BIO *next;
330
331	1.34k	ctx = (BIO_B64_CTX *)BIO_get_data(b);
332	1.34k	next = BIO_next(b);
333	1.34k	if (ctx == NULL \|\| next == NULL)
334	0	return 0;
335
336	1.34k	BIO_clear_retry_flags(b);
337
338	1.34k	if (ctx->encode != B64_ENCODE) {
339	1.34k	ctx->encode = B64_ENCODE;
340	1.34k	ctx->buf_len = 0;
341	1.34k	ctx->buf_off = 0;
342	1.34k	ctx->tmp_len = 0;
343	1.34k	EVP_EncodeInit(ctx->base64);
344	1.34k	}
345	1.34k	if (!ossl_assert(ctx->buf_off < (int)sizeof(ctx->buf))) {
346	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
347	0	return -1;
348	0	}
349	1.34k	if (!ossl_assert(ctx->buf_len <= (int)sizeof(ctx->buf))) {
350	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
351	0	return -1;
352	0	}
353	1.34k	if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
354	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
355	0	return -1;
356	0	}
357	1.34k	n = ctx->buf_len - ctx->buf_off;
358	1.34k	while (n > 0) {
359	0	i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
360	0	if (i <= 0) {
361	0	BIO_copy_next_retry(b);
362	0	return i;
363	0	}
364	0	ctx->buf_off += i;
365	0	if (!ossl_assert(ctx->buf_off <= (int)sizeof(ctx->buf))) {
366	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
367	0	return -1;
368	0	}
369	0	if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
370	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
371	0	return -1;
372	0	}
373	0	n -= i;
374	0	}
375		/* at this point all pending data has been written */
376	1.34k	ctx->buf_off = 0;
377	1.34k	ctx->buf_len = 0;
378
379	1.34k	if (in == NULL \|\| inl <= 0)
380	1.34k	return 0;
381
382	0	while (inl > 0) {
383	0	n = inl > B64_BLOCK_SIZE ? B64_BLOCK_SIZE : inl;
384
385	0	if ((BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) != 0) {
386	0	if (ctx->tmp_len > 0) {
387	0	if (!ossl_assert(ctx->tmp_len <= 3)) {
388	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
389	0	return ret == 0 ? -1 : ret;
390	0	}
391	0	n = 3 - ctx->tmp_len;
392		/*
393		* There's a theoretical possibility for this
394		*/
395	0	if (n > inl)
396	0	n = inl;
397	0	memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
398	0	ctx->tmp_len += n;
399	0	ret += n;
400	0	if (ctx->tmp_len < 3)
401	0	break;
402	0	ctx->buf_len =
403	0	EVP_EncodeBlock(ctx->buf, ctx->tmp, ctx->tmp_len);
404	0	if (!ossl_assert(ctx->buf_len <= (int)sizeof(ctx->buf))) {
405	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
406	0	return ret == 0 ? -1 : ret;
407	0	}
408	0	if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
409	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
410	0	return ret == 0 ? -1 : ret;
411	0	}
412		/*
413		* Since we're now done using the temporary buffer, the
414		* length should be 0'd
415		*/
416	0	ctx->tmp_len = 0;
417	0	} else {
418	0	if (n < 3) {
419	0	memcpy(ctx->tmp, in, n);
420	0	ctx->tmp_len = n;
421	0	ret += n;
422	0	break;
423	0	}
424	0	n -= n % 3;
425	0	ctx->buf_len =
426	0	EVP_EncodeBlock(ctx->buf, (unsigned char *)in, n);
427	0	if (!ossl_assert(ctx->buf_len <= (int)sizeof(ctx->buf))) {
428	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
429	0	return ret == 0 ? -1 : ret;
430	0	}
431	0	if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
432	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
433	0	return ret == 0 ? -1 : ret;
434	0	}
435	0	ret += n;
436	0	}
437	0	} else {
438	0	if (!EVP_EncodeUpdate(ctx->base64, ctx->buf, &ctx->buf_len,
439	0	(unsigned char *)in, n))
440	0	return ret == 0 ? -1 : ret;
441	0	if (!ossl_assert(ctx->buf_len <= (int)sizeof(ctx->buf))) {
442	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
443	0	return ret == 0 ? -1 : ret;
444	0	}
445	0	if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
446	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
447	0	return ret == 0 ? -1 : ret;
448	0	}
449	0	ret += n;
450	0	}
451	0	inl -= n;
452	0	in += n;
453
454	0	ctx->buf_off = 0;
455	0	n = ctx->buf_len;
456	0	while (n > 0) {
457	0	i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
458	0	if (i <= 0) {
459	0	BIO_copy_next_retry(b);
460	0	return ret == 0 ? i : ret;
461	0	}
462	0	n -= i;
463	0	ctx->buf_off += i;
464	0	if (!ossl_assert(ctx->buf_off <= (int)sizeof(ctx->buf))) {
465	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
466	0	return ret == 0 ? -1 : ret;
467	0	}
468	0	if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
469	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
470	0	return ret == 0 ? -1 : ret;
471	0	}
472	0	}
473	0	ctx->buf_len = 0;
474	0	ctx->buf_off = 0;
475	0	}
476	0	return ret;
477	0	}
478
479		static long b64_ctrl(BIO b, int cmd, long num, void ptr)
480	8.25k	{
481	8.25k	BIO_B64_CTX *ctx;
482	8.25k	long ret = 1;
483	8.25k	int i;
484	8.25k	BIO *next;
485
486	8.25k	ctx = (BIO_B64_CTX *)BIO_get_data(b);
487	8.25k	next = BIO_next(b);
488	8.25k	if (ctx == NULL \|\| next == NULL)
489	0	return 0;
490
491	8.25k	switch (cmd) {
492	0	case BIO_CTRL_RESET:
493	0	ctx->cont = 1;
494	0	ctx->start = 1;
495	0	ctx->encode = B64_NONE;
496	0	ret = BIO_ctrl(next, cmd, num, ptr);
497	0	break;
498	0	case BIO_CTRL_EOF: /* More to read */
499	0	if (ctx->cont <= 0)
500	0	ret = 1;
501	0	else
502	0	ret = BIO_ctrl(next, cmd, num, ptr);
503	0	break;
504	0	case BIO_CTRL_WPENDING: /* More to write in buffer */
505	0	if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
506	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
507	0	return -1;
508	0	}
509	0	ret = ctx->buf_len - ctx->buf_off;
510	0	if (ret == 0 && ctx->encode != B64_NONE
511	0	&& EVP_ENCODE_CTX_num(ctx->base64) != 0)
512	0	ret = 1;
513	0	else if (ret <= 0)
514	0	ret = BIO_ctrl(next, cmd, num, ptr);
515	0	break;
516	0	case BIO_CTRL_PENDING: /* More to read in buffer */
517	0	if (!ossl_assert(ctx->buf_len >= ctx->buf_off)) {
518	0	ERR_raise(ERR_LIB_BIO, ERR_R_INTERNAL_ERROR);
519	0	return -1;
520	0	}
521	0	ret = ctx->buf_len - ctx->buf_off;
522	0	if (ret <= 0)
523	0	ret = BIO_ctrl(next, cmd, num, ptr);
524	0	break;
525	2.75k	case BIO_CTRL_FLUSH:
526		/* do a final write */
527	2.82k	again:
528	4.17k	while (ctx->buf_len != ctx->buf_off) {
529	1.34k	i = b64_write(b, NULL, 0);
530	1.34k	if (i < 0)
531	0	return i;
532	1.34k	}
533	2.82k	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
534	0	if (ctx->tmp_len != 0) {
535	0	ctx->buf_len = EVP_EncodeBlock(ctx->buf,
536	0	ctx->tmp, ctx->tmp_len);
537	0	ctx->buf_off = 0;
538	0	ctx->tmp_len = 0;
539	0	goto again;
540	0	}
541	2.82k	} else if (ctx->encode != B64_NONE
542	2.82k	&& EVP_ENCODE_CTX_num(ctx->base64) != 0) {
543	69	ctx->buf_off = 0;
544	69	EVP_EncodeFinal(ctx->base64, ctx->buf, &(ctx->buf_len));
545		/* push out the bytes */
546	69	goto again;
547	69	}
548		/* Finally flush the underlying BIO */
549	2.75k	ret = BIO_ctrl(next, cmd, num, ptr);
550	2.75k	BIO_copy_next_retry(b);
551	2.75k	break;
552
553	0	case BIO_C_DO_STATE_MACHINE:
554	0	BIO_clear_retry_flags(b);
555	0	ret = BIO_ctrl(next, cmd, num, ptr);
556	0	BIO_copy_next_retry(b);
557	0	break;
558
559	0	case BIO_CTRL_DUP:
560	0	break;
561	0	case BIO_CTRL_INFO:
562	0	case BIO_CTRL_GET:
563	0	case BIO_CTRL_SET:
564	5.50k	default:
565	5.50k	ret = BIO_ctrl(next, cmd, num, ptr);
566	5.50k	break;
567	8.25k	}
568	8.25k	return ret;
569	8.25k	}
570
571		static long b64_callback_ctrl(BIO b, int cmd, BIO_info_cb fp)
572	0	{
573	0	BIO *next = BIO_next(b);
574
575	0	if (next == NULL)
576	0	return 0;
577
578	0	return BIO_callback_ctrl(next, cmd, fp);
579	0	}
580
581		static int b64_puts(BIO b, const char str)
582	0	{
583	0	size_t len = strlen(str);
584
585	0	if (len > INT_MAX)
586	0	return -1;
587	0	return b64_write(b, str, (int)len);
588	0	}