X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fevp%2Fbio_b64.c;h=a48cd17e28a65a1d7db52a02bd689056418917ac;hp=fa5cbc7eb1ffc68fa212a102856e092c55b6512e;hb=677963e5a428739062ab5d46d5baed5eadd0195d;hpb=27545970134d703ed96027aac9b67eced124eec3

diff --git a/crypto/evp/bio_b64.c b/crypto/evp/bio_b64.c
index fa5cbc7eb1..a48cd17e28 100644
--- a/crypto/evp/bio_b64.c
+++ b/crypto/evp/bio_b64.c
@@ -1,567 +1,543 @@
-/* crypto/evp/bio_b64.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
  *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- * 
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to.  The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- * 
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- * 
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *    "This product includes cryptographic software written by
- *     Eric Young (eay@cryptsoft.com)"
- *    The word 'cryptographic' can be left out if the rouines from the library
- *    being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from 
- *    the apps directory (application code) you must include an acknowledgement:
- *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- * 
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * 
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed.  i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
+ * 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 "cryptlib.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 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 BIO_METHOD methods_b64=
-	{
-	BIO_TYPE_BASE64,"base64 encoding",
-	b64_write,
-	b64_read,
-	NULL, /* b64_puts, */
-	NULL, /* b64_gets, */
-	b64_ctrl,
-	b64_new,
-	b64_free,
-	b64_callback_ctrl,
-	};
-
-BIO_METHOD *BIO_f_base64(void)
-	{
-	return(&methods_b64);
-	}
+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=(BIO_B64_CTX *)OPENSSL_malloc(sizeof(BIO_B64_CTX));
-	if (ctx == NULL) return(0);
-
-	ctx->buf_len=0;
-	ctx->tmp_len=0;
-	ctx->tmp_nl=0;
-	ctx->buf_off=0;
-	ctx->cont=1;
-	ctx->start=1;
-	ctx->encode=0;
-
-	bi->init=1;
-	bi->ptr=(char *)ctx;
-	bi->flags=0;
-	return(1);
-	}
+{
+    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)
-	{
-	if (a == NULL) return(0);
-	OPENSSL_free(a->ptr);
-	a->ptr=NULL;
-	a->init=0;
-	a->flags=0;
-	return(1);
-	}
-	
+{
+    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;
-
-	if (out == NULL) return(0);
-	ctx=(BIO_B64_CTX *)b->ptr;
-
-	if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
-
-	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)
-		{
-		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(b->next_bio,&(ctx->tmp[ctx->tmp_len]),
-			B64_BLOCK_SIZE-ctx->tmp_len);
-
-		if (i <= 0)
-			{
-			ret_code=i;
-
-			/* Should be continue next time we are called? */
-			if (!BIO_should_retry(b->next_bio))
-				{
-				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;
-			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)
-				{
-				/* 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;
-			}
-		/* If buffer isn't full and we can retry then
-		 * restart to read in more data.
-		 */
-		else if ((i < B64_BLOCK_SIZE) && (ctx->cont > 0))
-			continue;
-
-		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
-			{
-			int z,jj;
-
-			jj=(i>>2)<<2;
-			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)
-				{
-				memcpy((unsigned char *)ctx->tmp,
-					(unsigned char *)&(ctx->tmp[jj]),i-jj);
-				ctx->tmp_len=i-jj;
-				}
-			ctx->buf_len=0;
-			if (z > 0)
-				{
-				ctx->buf_len=z;
-				i=1;
-				}
-			else
-				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);
-	}
+{
+    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=inl,n,i;
-	BIO_B64_CTX *ctx;
-
-	ctx=(BIO_B64_CTX *)b->ptr;
-	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));
-		}
-
-	n=ctx->buf_len-ctx->buf_off;
-	while (n > 0)
-		{
-		i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
-		if (i <= 0)
-			{
-			BIO_copy_next_retry(b);
-			return(i);
-			}
-		ctx->buf_off+=i;
-		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)
-				{
-				n=3-ctx->tmp_len;
-				/* There's a teoretical possibility for this */
-				if (n > inl) 
-					n=inl;
-				memcpy(&(ctx->tmp[ctx->tmp_len]),in,n);
-				ctx->tmp_len+=n;
-				if (ctx->tmp_len < 3)
-					break;
-				ctx->buf_len=EVP_EncodeBlock(
-					(unsigned char *)ctx->buf,
-					(unsigned char *)ctx->tmp,
-					ctx->tmp_len);
-				/* 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[0]),in,n);
-					ctx->tmp_len=n;
-					break;
-					}
-				n-=n%3;
-				ctx->buf_len=EVP_EncodeBlock(
-					(unsigned char *)ctx->buf,
-					(unsigned char *)in,n);
-				}
-			}
-		else
-			{
-			EVP_EncodeUpdate(&(ctx->base64),
-				(unsigned char *)ctx->buf,&ctx->buf_len,
-				(unsigned char *)in,n);
-			}
-		inl-=n;
-		in+=n;
-
-		ctx->buf_off=0;
-		n=ctx->buf_len;
-		while (n > 0)
-			{
-			i=BIO_write(b->next_bio,&(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;
-			}
-		ctx->buf_len=0;
-		ctx->buf_off=0;
-		}
-	return(ret);
-	}
+{
+    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;
-
-	ctx=(BIO_B64_CTX *)b->ptr;
-
-	switch (cmd)
-		{
-	case BIO_CTRL_RESET:
-		ctx->cont=1;
-		ctx->start=1;
-		ctx->encode=B64_NONE;
-		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
-		break;
-	case BIO_CTRL_EOF:	/* More to read */
-		if (ctx->cont <= 0)
-			ret=1;
-		else
-			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
-		break;
-	case BIO_CTRL_WPENDING: /* More to write in buffer */
-		ret=ctx->buf_len-ctx->buf_off;
-		if ((ret == 0) && (ctx->encode != B64_NONE)
-			&& (ctx->base64.num != 0))
-			ret=1;
-		else if (ret <= 0)
-			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
-		break;
-	case BIO_CTRL_PENDING: /* More to read in buffer */
-		ret=ctx->buf_len-ctx->buf_off;
-		if (ret <= 0)
-			ret=BIO_ctrl(b->next_bio,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 && ctx->base64.num != 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(b->next_bio,cmd,num,ptr);
-		break;
-
-	case BIO_C_DO_STATE_MACHINE:
-		BIO_clear_retry_flags(b);
-		ret=BIO_ctrl(b->next_bio,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(b->next_bio,cmd,num,ptr);
-		break;
-		}
-	return(ret);
-	}
+{
+    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;
-
-	if (b->next_bio == NULL) return(0);
-	switch (cmd)
-		{
-	default:
-		ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
-		break;
-		}
-	return(ret);
-	}
-
+{
+    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));
+}