--- /dev/null
+/* crypto/evp/bio_b64.c */
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * 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.]
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include "cryptlib.h"
+#include <openssl/buffer.h>
+#include <openssl/evp.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 BIO_METHOD methods_b64=
+ {
+ BIO_TYPE_BASE64,"base64 encoding",
+ b64_write,
+ b64_read,
+ b64_puts,
+ NULL, /* b64_gets, */
+ b64_ctrl,
+ b64_new,
+ b64_free,
+ b64_callback_ctrl,
+ };
+
+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;
+ bi->num = 0;
+ 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);
+ }
+
+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);
+
+ 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(b->next_bio,&(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(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;
+ 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;
+
+#if 0
+ jj=(i>>2)<<2;
+#else
+ jj = i & ~3; /* process per 4 */
+#endif
+ 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;
+
+ 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));
+ }
+
+ 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(b->next_bio,&(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
+ {
+ EVP_EncodeUpdate(&(ctx->base64),
+ (unsigned char *)ctx->buf,&ctx->buf_len,
+ (unsigned char *)in,n);
+ 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(b->next_bio,&(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 */
+ OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
+ 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 */
+ OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
+ 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);
+ }
+
+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);
+ }
+
+static int b64_puts(BIO *b, const char *str)
+ {
+ return b64_write(b,str,strlen(str));
+ }
projects / cassiopeia.git / blobdiff