[thirdparty/openssl.git] / crypto / evp / bio_b64.c

/*
 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

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

static int b64_write(BIO *h, const char *buf, int num);
static int b64_read(BIO *h, char *buf, int size);
static int b64_puts(BIO *h, const char *str);
/*
 * static int b64_gets(BIO *h, char *str, int size);
 */
static long b64_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int b64_new(BIO *h);
static int b64_free(BIO *data);
static long b64_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
#define B64_BLOCK_SIZE  1024
#define B64_BLOCK_SIZE2 768
#define B64_NONE        0
#define B64_ENCODE      1
#define B64_DECODE      2

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

static const BIO_METHOD methods_b64 = {
    BIO_TYPE_BASE64, "base64 encoding",
    /* TODO: Convert to new style write function */
    bwrite_conv,
    b64_write,
    /* TODO: Convert to new style read function */
    bread_conv,
    b64_read,
    b64_puts,
    NULL,                       /* b64_gets, */
    b64_ctrl,
    b64_new,
    b64_free,
    b64_callback_ctrl,
};


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

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

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

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

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

    return 1;
}

static int b64_free(BIO *a)
{
    BIO_B64_CTX *ctx;
    if (a == NULL)
        return 0;

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

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

    return 1;
}

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

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

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

    BIO_clear_retry_flags(b);

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

    /* First check if there are bytes decoded/encoded */
    if (ctx->buf_len > 0) {
        OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
        i = ctx->buf_len - ctx->buf_off;
        if (i > outl)
            i = outl;
        OPENSSL_assert(ctx->buf_off + i < (int)sizeof(ctx->buf));
        memcpy(out, &(ctx->buf[ctx->buf_off]), i);
        ret = i;
        out += i;
        outl -= i;
        ctx->buf_off += i;
        if (ctx->buf_len == ctx->buf_off) {
            ctx->buf_len = 0;
            ctx->buf_off = 0;
        }
    }

    /*
     * At this point, we have room of outl bytes and an empty buffer, so we
     * should read in some more.
     */

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

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

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

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

        /*
         * We need to scan, a line at a time until we have a valid line if we
         * are starting.
         */
        if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)) {
            /* 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;
        }
        ctx->buf_off = 0;
        if (i < 0) {
            ret_code = 0;
            ctx->buf_len = 0;
            break;
        }

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

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

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

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

    BIO_clear_retry_flags(b);

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

    OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
    OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
    OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
    n = ctx->buf_len - ctx->buf_off;
    while (n > 0) {
        i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
        if (i <= 0) {
            BIO_copy_next_retry(b);
            return (i);
        }
        OPENSSL_assert(i <= n);
        ctx->buf_off += i;
        OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
        OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
        n -= i;
    }
    /* at this point all pending data has been written */
    ctx->buf_off = 0;
    ctx->buf_len = 0;

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

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

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

        ctx->buf_off = 0;
        n = ctx->buf_len;
        while (n > 0) {
            i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
            if (i <= 0) {
                BIO_copy_next_retry(b);
                return ((ret == 0) ? i : ret);
            }
            OPENSSL_assert(i <= n);
            n -= i;
            ctx->buf_off += i;
            OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
            OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
        }
        ctx->buf_len = 0;
        ctx->buf_off = 0;
    }
    return (ret);
}

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

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

    switch (cmd) {
    case BIO_CTRL_RESET:
        ctx->cont = 1;
        ctx->start = 1;
        ctx->encode = B64_NONE;
        ret = BIO_ctrl(next, cmd, num, ptr);
        break;
    case BIO_CTRL_EOF:         /* More to read */
        if (ctx->cont <= 0)
            ret = 1;
        else
            ret = BIO_ctrl(next, cmd, num, ptr);
        break;
    case BIO_CTRL_WPENDING:    /* More to write in buffer */
        OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
        ret = ctx->buf_len - ctx->buf_off;
        if ((ret == 0) && (ctx->encode != B64_NONE)
            && (EVP_ENCODE_CTX_num(ctx->base64) != 0))
            ret = 1;
        else if (ret <= 0)
            ret = BIO_ctrl(next, cmd, num, ptr);
        break;
    case BIO_CTRL_PENDING:     /* More to read in buffer */
        OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
        ret = ctx->buf_len - ctx->buf_off;
        if (ret <= 0)
            ret = BIO_ctrl(next, cmd, num, ptr);
        break;
    case BIO_CTRL_FLUSH:
        /* do a final write */
 again:
        while (ctx->buf_len != ctx->buf_off) {
            i = b64_write(b, NULL, 0);
            if (i < 0)
                return i;
        }
        if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
            if (ctx->tmp_len != 0) {
                ctx->buf_len = EVP_EncodeBlock((unsigned char *)ctx->buf,
                                               (unsigned char *)ctx->tmp,
                                               ctx->tmp_len);
                ctx->buf_off = 0;
                ctx->tmp_len = 0;
                goto again;
            }
        } else if (ctx->encode != B64_NONE
                   && EVP_ENCODE_CTX_num(ctx->base64) != 0) {
            ctx->buf_off = 0;
            EVP_EncodeFinal(ctx->base64,
                            (unsigned char *)ctx->buf, &(ctx->buf_len));
            /* push out the bytes */
            goto again;
        }
        /* Finally flush the underlying BIO */
        ret = BIO_ctrl(next, cmd, num, ptr);
        break;

    case BIO_C_DO_STATE_MACHINE:
        BIO_clear_retry_flags(b);
        ret = BIO_ctrl(next, cmd, num, ptr);
        BIO_copy_next_retry(b);
        break;

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

static long b64_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
{
    long ret = 1;
    BIO *next = BIO_next(b);

    if (next == NULL)
        return 0;
    switch (cmd) {
    default:
        ret = BIO_callback_ctrl(next, cmd, fp);
        break;
    }
    return (ret);
}

static int b64_puts(BIO *b, const char *str)
{
    return b64_write(b, str, strlen(str));
}
Commit	Line	Data
62867571 RS	1	/*
62867571 RS	2	* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
d02b48c6	3	*
62867571 RS	4	* Licensed under the OpenSSL license (the "License"). You may not use
	5	* this file except in compliance with the License. You can obtain a copy
	6	* in the file LICENSE in the source distribution or at
	7	* https://www.openssl.org/source/license.html
d02b48c6 RE	8	*/
	9
	10	#include <stdio.h>
	11	#include <errno.h>
b39fc560	12	#include "internal/cryptlib.h"
ec577822 BM	13	#include <openssl/buffer.h>
ec577822 BM	14	#include <openssl/evp.h>
a146ae55	15	#include "internal/bio.h"
d02b48c6	16
0e1c0612 UM	17	static int b64_write(BIO h, const char buf, int num);
0e1c0612 UM	18	static int b64_read(BIO h, char buf, int size);
cb877ccb	19	static int b64_puts(BIO h, const char str);
0f113f3e MC	20	/*
	21	* static int b64_gets(BIO h, char str, int size);
	22	*/
0e1c0612	23	static long b64_ctrl(BIO h, int cmd, long arg1, void arg2);
d02b48c6 RE	24	static int b64_new(BIO *h);
d02b48c6 RE	25	static int b64_free(BIO *data);
0f113f3e MC	26	static long b64_callback_ctrl(BIO h, int cmd, bio_info_cb fp);
	27	#define B64_BLOCK_SIZE 1024
	28	#define B64_BLOCK_SIZE2 768
	29	#define B64_NONE 0
	30	#define B64_ENCODE 1
	31	#define B64_DECODE 2
	32
	33	typedef struct b64_struct {
	34	/*
	35	* BIO *bio; moved to the BIO structure
	36	*/
	37	int buf_len;
	38	int buf_off;
	39	int tmp_len; /* used to find the start when decoding */
	40	int tmp_nl; /* If true, scan until '\n' */
	41	int encode;
	42	int start; /* have we started decoding yet? */
	43	int cont; /* <= 0 when finished */
b518d2d5	44	EVP_ENCODE_CTX *base64;
0f113f3e MC	45	char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE) + 10];
	46	char tmp[B64_BLOCK_SIZE];
	47	} BIO_B64_CTX;
	48
04f6b0fd	49	static const BIO_METHOD methods_b64 = {
0f113f3e	50	BIO_TYPE_BASE64, "base64 encoding",
3befffa3 MC	51	/* TODO: Convert to new style write function */
3befffa3 MC	52	bwrite_conv,
0f113f3e	53	b64_write,
d07aee2c MC	54	/* TODO: Convert to new style read function */
d07aee2c MC	55	bread_conv,
0f113f3e MC	56	b64_read,
	57	b64_puts,
	58	NULL, /* b64_gets, */
	59	b64_ctrl,
	60	b64_new,
	61	b64_free,
	62	b64_callback_ctrl,
	63	};
d02b48c6	64
a146ae55	65
04f6b0fd	66	const BIO_METHOD *BIO_f_base64(void)
0f113f3e	67	{
a146ae55	68	return &methods_b64;
0f113f3e	69	}
d02b48c6	70
6b691a5c	71	static int b64_new(BIO *bi)
0f113f3e MC	72	{
	73	BIO_B64_CTX *ctx;
	74
64b25758	75	ctx = OPENSSL_zalloc(sizeof(*ctx));
0f113f3e	76	if (ctx == NULL)
cb1d435c	77	return 0;
0f113f3e	78
0f113f3e MC	79	ctx->cont = 1;
0f113f3e MC	80	ctx->start = 1;
e0d32e98	81	ctx->base64 = EVP_ENCODE_CTX_new();
cb1d435c MRA	82	if (ctx->base64 == NULL) {
	83	OPENSSL_free(ctx);
	84	return 0;
	85	}
	86
a146ae55 MC	87	BIO_set_data(bi, ctx);
	88	BIO_set_init(bi, 1);
	89
	90	return 1;
0f113f3e	91	}
d02b48c6	92
6b691a5c	93	static int b64_free(BIO *a)
0f113f3e	94	{
a146ae55	95	BIO_B64_CTX *ctx;
0f113f3e	96	if (a == NULL)
a146ae55 MC	97	return 0;
	98
	99	ctx = BIO_get_data(a);
	100	if (ctx == NULL)
	101	return 0;
	102
	103	EVP_ENCODE_CTX_free(ctx->base64);
	104	OPENSSL_free(ctx);
	105	BIO_set_data(a, NULL);
	106	BIO_set_init(a, 0);
	107
	108	return 1;
0f113f3e MC	109	}
0f113f3e MC	110
6b691a5c	111	static int b64_read(BIO b, char out, int outl)
0f113f3e MC	112	{
	113	int ret = 0, i, ii, j, k, x, n, num, ret_code = 0;
	114	BIO_B64_CTX *ctx;
	115	unsigned char p, q;
a146ae55	116	BIO *next;
0f113f3e MC	117
	118	if (out == NULL)
	119	return (0);
a146ae55	120	ctx = (BIO_B64_CTX *)BIO_get_data(b);
0f113f3e	121
a146ae55 MC	122	next = BIO_next(b);
	123	if ((ctx == NULL) \|\| (next == NULL))
	124	return 0;
0f113f3e MC	125
	126	BIO_clear_retry_flags(b);
	127
	128	if (ctx->encode != B64_DECODE) {
	129	ctx->encode = B64_DECODE;
	130	ctx->buf_len = 0;
	131	ctx->buf_off = 0;
	132	ctx->tmp_len = 0;
b518d2d5	133	EVP_DecodeInit(ctx->base64);
0f113f3e MC	134	}
	135
	136	/* First check if there are bytes decoded/encoded */
	137	if (ctx->buf_len > 0) {
	138	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
	139	i = ctx->buf_len - ctx->buf_off;
	140	if (i > outl)
	141	i = outl;
	142	OPENSSL_assert(ctx->buf_off + i < (int)sizeof(ctx->buf));
	143	memcpy(out, &(ctx->buf[ctx->buf_off]), i);
	144	ret = i;
	145	out += i;
	146	outl -= i;
	147	ctx->buf_off += i;
	148	if (ctx->buf_len == ctx->buf_off) {
	149	ctx->buf_len = 0;
	150	ctx->buf_off = 0;
	151	}
	152	}
	153
	154	/*
	155	* At this point, we have room of outl bytes and an empty buffer, so we
	156	* should read in some more.
	157	*/
	158
	159	ret_code = 0;
	160	while (outl > 0) {
	161	if (ctx->cont <= 0)
	162	break;
	163
a146ae55	164	i = BIO_read(next, &(ctx->tmp[ctx->tmp_len]),
0f113f3e MC	165	B64_BLOCK_SIZE - ctx->tmp_len);
	166
	167	if (i <= 0) {
	168	ret_code = i;
	169
	170	/* Should we continue next time we are called? */
a146ae55	171	if (!BIO_should_retry(next)) {
0f113f3e MC	172	ctx->cont = i;
	173	/* If buffer empty break */
	174	if (ctx->tmp_len == 0)
	175	break;
	176	/* Fall through and process what we have */
	177	else
	178	i = 0;
	179	}
	180	/* else we retry and add more data to buffer */
	181	else
	182	break;
	183	}
	184	i += ctx->tmp_len;
	185	ctx->tmp_len = i;
	186
	187	/*
	188	* We need to scan, a line at a time until we have a valid line if we
	189	* are starting.
	190	*/
	191	if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)) {
	192	/* ctx->start=1; */
	193	ctx->tmp_len = 0;
	194	} else if (ctx->start) {
	195	q = p = (unsigned char *)ctx->tmp;
	196	num = 0;
	197	for (j = 0; j < i; j++) {
	198	if (*(q++) != '\n')
	199	continue;
	200
	201	/*
	202	* due to a previous very long line, we need to keep on
	203	* scanning for a '\n' before we even start looking for
	204	* base64 encoded stuff.
	205	*/
	206	if (ctx->tmp_nl) {
	207	p = q;
	208	ctx->tmp_nl = 0;
	209	continue;
	210	}
	211
b518d2d5	212	k = EVP_DecodeUpdate(ctx->base64,
0f113f3e MC	213	(unsigned char *)ctx->buf,
	214	&num, p, q - p);
	215	if ((k <= 0) && (num == 0) && (ctx->start))
b518d2d5	216	EVP_DecodeInit(ctx->base64);
0f113f3e MC	217	else {
	218	if (p != (unsigned char *)
	219	&(ctx->tmp[0])) {
	220	i -= (p - (unsigned char *)
	221	&(ctx->tmp[0]));
	222	for (x = 0; x < i; x++)
	223	ctx->tmp[x] = p[x];
	224	}
b518d2d5	225	EVP_DecodeInit(ctx->base64);
0f113f3e MC	226	ctx->start = 0;
	227	break;
	228	}
	229	p = q;
	230	}
	231
	232	/* we fell off the end without starting */
	233	if ((j == i) && (num == 0)) {
	234	/*
	235	* Is this is one long chunk?, if so, keep on reading until a
	236	* new line.
	237	*/
	238	if (p == (unsigned char *)&(ctx->tmp[0])) {
	239	/* Check buffer full */
	240	if (i == B64_BLOCK_SIZE) {
	241	ctx->tmp_nl = 1;
	242	ctx->tmp_len = 0;
	243	}
	244	} else if (p != q) { /* finished on a '\n' */
	245	n = q - p;
	246	for (ii = 0; ii < n; ii++)
	247	ctx->tmp[ii] = p[ii];
	248	ctx->tmp_len = n;
	249	}
	250	/* else finished on a '\n' */
	251	continue;
	252	} else {
	253	ctx->tmp_len = 0;
	254	}
	255	} else if ((i < B64_BLOCK_SIZE) && (ctx->cont > 0)) {
	256	/*
	257	* If buffer isn't full and we can retry then restart to read in
	258	* more data.
	259	*/
	260	continue;
	261	}
	262
	263	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
	264	int z, jj;
58964a49	265
0f113f3e	266	jj = i & ~3; /* process per 4 */
0f113f3e MC	267	z = EVP_DecodeBlock((unsigned char *)ctx->buf,
	268	(unsigned char *)ctx->tmp, jj);
	269	if (jj > 2) {
	270	if (ctx->tmp[jj - 1] == '=') {
	271	z--;
	272	if (ctx->tmp[jj - 2] == '=')
	273	z--;
	274	}
	275	}
	276	/*
	277	* z is now number of output bytes and jj is the number consumed
	278	*/
	279	if (jj != i) {
	280	memmove(ctx->tmp, &ctx->tmp[jj], i - jj);
	281	ctx->tmp_len = i - jj;
	282	}
	283	ctx->buf_len = 0;
	284	if (z > 0) {
	285	ctx->buf_len = z;
	286	}
	287	i = z;
	288	} else {
b518d2d5	289	i = EVP_DecodeUpdate(ctx->base64,
0f113f3e MC	290	(unsigned char *)ctx->buf, &ctx->buf_len,
	291	(unsigned char *)ctx->tmp, i);
	292	ctx->tmp_len = 0;
	293	}
	294	ctx->buf_off = 0;
	295	if (i < 0) {
	296	ret_code = 0;
	297	ctx->buf_len = 0;
	298	break;
	299	}
	300
	301	if (ctx->buf_len <= outl)
	302	i = ctx->buf_len;
	303	else
	304	i = outl;
	305
	306	memcpy(out, ctx->buf, i);
	307	ret += i;
	308	ctx->buf_off = i;
	309	if (ctx->buf_off == ctx->buf_len) {
	310	ctx->buf_len = 0;
	311	ctx->buf_off = 0;
	312	}
	313	outl -= i;
	314	out += i;
	315	}
	316	/* BIO_clear_retry_flags(b); */
	317	BIO_copy_next_retry(b);
	318	return ((ret == 0) ? ret_code : ret);
	319	}
d02b48c6	320
0e1c0612	321	static int b64_write(BIO b, const char in, int inl)
0f113f3e MC	322	{
	323	int ret = 0;
	324	int n;
	325	int i;
	326	BIO_B64_CTX *ctx;
a146ae55 MC	327	BIO *next;
	328
	329	ctx = (BIO_B64_CTX *)BIO_get_data(b);
	330	next = BIO_next(b);
	331	if ((ctx == NULL) \|\| (next == NULL))
	332	return 0;
0f113f3e	333
0f113f3e MC	334	BIO_clear_retry_flags(b);
	335
	336	if (ctx->encode != B64_ENCODE) {
	337	ctx->encode = B64_ENCODE;
	338	ctx->buf_len = 0;
	339	ctx->buf_off = 0;
	340	ctx->tmp_len = 0;
b518d2d5	341	EVP_EncodeInit(ctx->base64);
0f113f3e MC	342	}
	343
	344	OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
	345	OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
	346	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
	347	n = ctx->buf_len - ctx->buf_off;
	348	while (n > 0) {
a146ae55	349	i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
0f113f3e MC	350	if (i <= 0) {
	351	BIO_copy_next_retry(b);
	352	return (i);
	353	}
	354	OPENSSL_assert(i <= n);
	355	ctx->buf_off += i;
	356	OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
	357	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
	358	n -= i;
	359	}
	360	/* at this point all pending data has been written */
	361	ctx->buf_off = 0;
	362	ctx->buf_len = 0;
	363
	364	if ((in == NULL) \|\| (inl <= 0))
	365	return (0);
	366
	367	while (inl > 0) {
	368	n = (inl > B64_BLOCK_SIZE) ? B64_BLOCK_SIZE : inl;
	369
	370	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
	371	if (ctx->tmp_len > 0) {
	372	OPENSSL_assert(ctx->tmp_len <= 3);
	373	n = 3 - ctx->tmp_len;
	374	/*
	375	* There's a theoretical possibility for this
	376	*/
	377	if (n > inl)
	378	n = inl;
	379	memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
	380	ctx->tmp_len += n;
	381	ret += n;
	382	if (ctx->tmp_len < 3)
	383	break;
	384	ctx->buf_len =
	385	EVP_EncodeBlock((unsigned char *)ctx->buf,
	386	(unsigned char *)ctx->tmp, ctx->tmp_len);
	387	OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
	388	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
	389	/*
	390	* Since we're now done using the temporary buffer, the
	391	* length should be 0'd
	392	*/
	393	ctx->tmp_len = 0;
	394	} else {
	395	if (n < 3) {
	396	memcpy(ctx->tmp, in, n);
	397	ctx->tmp_len = n;
	398	ret += n;
	399	break;
	400	}
	401	n -= n % 3;
	402	ctx->buf_len =
	403	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 {
cf3404fc MC	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);
0f113f3e MC	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) {
a146ae55	424	i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
0f113f3e MC	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	}
d02b48c6	440
0e1c0612	441	static long b64_ctrl(BIO b, int cmd, long num, void ptr)
0f113f3e MC	442	{
	443	BIO_B64_CTX *ctx;
	444	long ret = 1;
	445	int i;
a146ae55	446	BIO *next;
0f113f3e	447
a146ae55 MC	448	ctx = (BIO_B64_CTX *)BIO_get_data(b);
	449	next = BIO_next(b);
	450	if ((ctx == NULL) \|\| (next == NULL))
	451	return 0;
0f113f3e MC	452
	453	switch (cmd) {
	454	case BIO_CTRL_RESET:
	455	ctx->cont = 1;
	456	ctx->start = 1;
	457	ctx->encode = B64_NONE;
a146ae55	458	ret = BIO_ctrl(next, cmd, num, ptr);
0f113f3e MC	459	break;
	460	case BIO_CTRL_EOF: /* More to read */
	461	if (ctx->cont <= 0)
	462	ret = 1;
	463	else
a146ae55	464	ret = BIO_ctrl(next, cmd, num, ptr);
0f113f3e MC	465	break;
	466	case BIO_CTRL_WPENDING: /* More to write in buffer */
	467	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
	468	ret = ctx->buf_len - ctx->buf_off;
	469	if ((ret == 0) && (ctx->encode != B64_NONE)
b518d2d5	470	&& (EVP_ENCODE_CTX_num(ctx->base64) != 0))
0f113f3e MC	471	ret = 1;
0f113f3e MC	472	else if (ret <= 0)
a146ae55	473	ret = BIO_ctrl(next, cmd, num, ptr);
0f113f3e MC	474	break;
	475	case BIO_CTRL_PENDING: /* More to read in buffer */
	476	OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
	477	ret = ctx->buf_len - ctx->buf_off;
	478	if (ret <= 0)
a146ae55	479	ret = BIO_ctrl(next, cmd, num, ptr);
0f113f3e MC	480	break;
	481	case BIO_CTRL_FLUSH:
	482	/* do a final write */
	483	again:
	484	while (ctx->buf_len != ctx->buf_off) {
	485	i = b64_write(b, NULL, 0);
	486	if (i < 0)
	487	return i;
	488	}
	489	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
	490	if (ctx->tmp_len != 0) {
	491	ctx->buf_len = EVP_EncodeBlock((unsigned char *)ctx->buf,
	492	(unsigned char *)ctx->tmp,
	493	ctx->tmp_len);
	494	ctx->buf_off = 0;
	495	ctx->tmp_len = 0;
	496	goto again;
	497	}
b518d2d5 RL	498	} else if (ctx->encode != B64_NONE
b518d2d5 RL	499	&& EVP_ENCODE_CTX_num(ctx->base64) != 0) {
0f113f3e	500	ctx->buf_off = 0;
b518d2d5	501	EVP_EncodeFinal(ctx->base64,
0f113f3e MC	502	(unsigned char *)ctx->buf, &(ctx->buf_len));
	503	/* push out the bytes */
	504	goto again;
	505	}
	506	/* Finally flush the underlying BIO */
a146ae55	507	ret = BIO_ctrl(next, cmd, num, ptr);
0f113f3e MC	508	break;
	509
	510	case BIO_C_DO_STATE_MACHINE:
	511	BIO_clear_retry_flags(b);
a146ae55	512	ret = BIO_ctrl(next, cmd, num, ptr);
0f113f3e MC	513	BIO_copy_next_retry(b);
	514	break;
	515
	516	case BIO_CTRL_DUP:
	517	break;
	518	case BIO_CTRL_INFO:
	519	case BIO_CTRL_GET:
	520	case BIO_CTRL_SET:
	521	default:
a146ae55	522	ret = BIO_ctrl(next, cmd, num, ptr);
0f113f3e MC	523	break;
0f113f3e MC	524	}
a146ae55	525	return ret;
0f113f3e	526	}
d02b48c6	527
13083215	528	static long b64_callback_ctrl(BIO b, int cmd, bio_info_cb fp)
0f113f3e MC	529	{
0f113f3e MC	530	long ret = 1;
a146ae55	531	BIO *next = BIO_next(b);
0f113f3e	532
a146ae55 MC	533	if (next == NULL)
a146ae55 MC	534	return 0;
0f113f3e MC	535	switch (cmd) {
0f113f3e MC	536	default:
a146ae55	537	ret = BIO_callback_ctrl(next, cmd, fp);
0f113f3e MC	538	break;
	539	}
	540	return (ret);
	541	}
d3442bc7	542
cb877ccb	543	static int b64_puts(BIO b, const char str)
0f113f3e MC	544	{
	545	return b64_write(b, str, strlen(str));
	546	}