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-rw-r--r--src/decrepit/bio/base64_bio.c536
1 files changed, 536 insertions, 0 deletions
diff --git a/src/decrepit/bio/base64_bio.c b/src/decrepit/bio/base64_bio.c
new file mode 100644
index 0000000..2056138
--- /dev/null
+++ b/src/decrepit/bio/base64_bio.c
@@ -0,0 +1,536 @@
+/* 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 <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <openssl/base64.h>
+#include <openssl/bio.h>
+#include <openssl/buffer.h>
+#include <openssl/evp.h>
+#include <openssl/mem.h>
+
+
+#define B64_BLOCK_SIZE 1024
+#define B64_BLOCK_SIZE2 768
+#define B64_NONE 0
+#define B64_ENCODE 1
+#define B64_DECODE 2
+#define EVP_ENCODE_LENGTH(l) (((l+2)/3*4)+(l/48+1)*2+80)
+
+typedef struct b64_struct {
+ 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 int b64_new(BIO *bio) {
+ BIO_B64_CTX *ctx;
+
+ ctx = OPENSSL_malloc(sizeof(*ctx));
+ if (ctx == NULL) {
+ return 0;
+ }
+
+ memset(ctx, 0, sizeof(*ctx));
+
+ ctx->cont = 1;
+ ctx->start = 1;
+
+ bio->init = 1;
+ bio->ptr = (char *)ctx;
+ return 1;
+}
+
+static int b64_free(BIO *bio) {
+ if (bio == NULL) {
+ return 0;
+ }
+ OPENSSL_free(bio->ptr);
+ bio->ptr = NULL;
+ bio->init = 0;
+ bio->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;
+ uint8_t *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) {
+ assert(ctx->buf_len >= ctx->buf_off);
+ i = ctx->buf_len - ctx->buf_off;
+ if (i > outl) {
+ i = outl;
+ }
+ 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;
+ } else {
+ /* Fall through and process what we have */
+ i = 0;
+ }
+ } else {
+ /* else we retry and add more data to buffer */
+ 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_test_flags(b, BIO_FLAGS_BASE64_NO_NL))) {
+ /* ctx->start = 1; */
+ ctx->tmp_len = 0;
+ } else if (ctx->start) {
+ q = p = (uint8_t *)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), (uint8_t *)ctx->buf, &num, p,
+ q - p);
+
+ if (k <= 0 && num == 0 && ctx->start) {
+ EVP_DecodeInit(&ctx->base64);
+ } else {
+ if (p != (uint8_t *)&(ctx->tmp[0])) {
+ i -= (p - (uint8_t *)&(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 == (uint8_t *)&(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_test_flags(b, BIO_FLAGS_BASE64_NO_NL)) {
+ int z, jj;
+
+ jj = i & ~3; /* process per 4 */
+ z = EVP_DecodeBlock((uint8_t *)ctx->buf, (uint8_t *)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), (uint8_t *)ctx->buf,
+ &ctx->buf_len, (uint8_t *)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_copy_next_retry(b);
+ return ret == 0 ? ret_code : ret;
+}
+
+static int b64_write(BIO *b, const char *in, int inl) {
+ int ret = 0, 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));
+ }
+
+ assert(ctx->buf_off < (int)sizeof(ctx->buf));
+ assert(ctx->buf_len <= (int)sizeof(ctx->buf));
+ 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;
+ }
+ assert(i <= n);
+ ctx->buf_off += i;
+ assert(ctx->buf_off <= (int)sizeof(ctx->buf));
+ 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_test_flags(b, BIO_FLAGS_BASE64_NO_NL)) {
+ if (ctx->tmp_len > 0) {
+ assert(ctx->tmp_len <= 3);
+ n = 3 - ctx->tmp_len;
+ /* There's a theoretical possibility of 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((uint8_t *)ctx->buf, (uint8_t *)ctx->tmp,
+ ctx->tmp_len);
+ assert(ctx->buf_len <= (int)sizeof(ctx->buf));
+ assert(ctx->buf_len >= ctx->buf_off);
+
+ /* Since we're now done using the temporary buffer, the length should
+ * be zeroed. */
+ 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((uint8_t *)ctx->buf, (const uint8_t *)in, n);
+ assert(ctx->buf_len <= (int)sizeof(ctx->buf));
+ assert(ctx->buf_len >= ctx->buf_off);
+ ret += n;
+ }
+ } else {
+ EVP_EncodeUpdate(&(ctx->base64), (uint8_t *)ctx->buf, &ctx->buf_len,
+ (uint8_t *)in, n);
+ assert(ctx->buf_len <= (int)sizeof(ctx->buf));
+ 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;
+ }
+ assert(i <= n);
+ n -= i;
+ ctx->buf_off += i;
+ assert(ctx->buf_off <= (int)sizeof(ctx->buf));
+ 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 */
+ 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 */
+ 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_test_flags(b, BIO_FLAGS_BASE64_NO_NL)) {
+ if (ctx->tmp_len != 0) {
+ ctx->buf_len = EVP_EncodeBlock((uint8_t *)ctx->buf,
+ (uint8_t *)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), (uint8_t *)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_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));
+}
+
+static const BIO_METHOD b64_method = {
+ BIO_TYPE_BASE64, "base64 encoding", b64_write, b64_read, b64_puts,
+ NULL /* gets */, b64_ctrl, b64_new, b64_free, b64_callback_ctrl,
+};
+
+const BIO_METHOD *BIO_f_base64(void) { return &b64_method; }
generated by cgit v1.1 at 2024-12-22 10:07:49 +0000