--- /dev/null
+/*
+
+ silcbase64.c
+
+ Author: Pekka Riikonen <priikone@silcnet.org>
+
+ Copyright (C) 2007 Pekka Riikonen
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+*/
+
+#include "silc.h"
+
+static unsigned char pem_enc[64] =
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+/* Encodes data into Base 64 encoding. Returns NULL terminated base 64 encoded
+ data string. */
+
+char *silc_base64_encode(SilcStack stack, unsigned char *data, SilcUInt32 len)
+{
+ int i, j;
+ SilcUInt32 bits, c, char_count;
+ char *pem;
+
+ char_count = 0;
+ bits = 0;
+ j = 0;
+
+ pem = silc_scalloc(stack, ((len * 8 + 5) / 6) + 5, sizeof(*pem));
+
+ for (i = 0; i < len; i++) {
+ c = data[i];
+ bits += c;
+ char_count++;
+
+ if (char_count == 3) {
+ pem[j++] = pem_enc[bits >> 18];
+ pem[j++] = pem_enc[(bits >> 12) & 0x3f];
+ pem[j++] = pem_enc[(bits >> 6) & 0x3f];
+ pem[j++] = pem_enc[bits & 0x3f];
+ bits = 0;
+ char_count = 0;
+ } else {
+ bits <<= 8;
+ }
+ }
+
+ if (char_count != 0) {
+ bits <<= 16 - (8 * char_count);
+ pem[j++] = pem_enc[bits >> 18];
+ pem[j++] = pem_enc[(bits >> 12) & 0x3f];
+
+ if (char_count == 1) {
+ pem[j++] = '=';
+ pem[j] = '=';
+ } else {
+ pem[j++] = pem_enc[(bits >> 6) & 0x3f];
+ pem[j] = '=';
+ }
+ }
+
+ return pem;
+}
+
+/* Same as above but puts newline ('\n') every 72 characters. */
+
+char *silc_base64_encode_file(SilcStack stack,
+ unsigned char *data, SilcUInt32 data_len)
+{
+ int i, j;
+ SilcUInt32 len, cols;
+ char *pem, *pem2;
+
+ pem = silc_base64_encode(stack, data, data_len);
+ len = strlen(pem);
+
+ pem2 = silc_scalloc(stack, len + (len / 72) + 1, sizeof(*pem2));
+
+ for (i = 0, j = 0, cols = 1; i < len; i++, cols++) {
+ if (cols == 72) {
+ pem2[i] = '\n';
+ cols = 0;
+ len++;
+ continue;
+ }
+
+ pem2[i] = pem[j++];
+ }
+
+ silc_sfree(stack, pem);
+ return pem2;
+}
+
+/* Decodes Base 64 into data. Returns the decoded data. */
+
+unsigned char *silc_base64_decode(SilcStack stack,
+ unsigned char *base64,
+ SilcUInt32 base64_len,
+ SilcUInt32 *ret_len)
+{
+ int i, j;
+ SilcUInt32 len, c, char_count, bits;
+ unsigned char *data;
+ static char ialpha[256], decoder[256];
+
+ for (i = 64 - 1; i >= 0; i--) {
+ ialpha[pem_enc[i]] = 1;
+ decoder[pem_enc[i]] = i;
+ }
+
+ char_count = 0;
+ bits = 0;
+ j = 0;
+
+ if (!base64_len)
+ len = strlen(base64);
+ else
+ len = base64_len;
+
+ data = silc_scalloc(stack, ((len * 6) / 8), sizeof(*data));
+
+ for (i = 0; i < len; i++) {
+ c = base64[i];
+
+ if (c == '=')
+ break;
+
+ if (c > 127 || !ialpha[c])
+ continue;
+
+ bits += decoder[c];
+ char_count++;
+
+ if (char_count == 4) {
+ data[j++] = bits >> 16;
+ data[j++] = (bits >> 8) & 0xff;
+ data[j++] = bits & 0xff;
+ bits = 0;
+ char_count = 0;
+ } else {
+ bits <<= 6;
+ }
+ }
+
+ switch(char_count) {
+ case 1:
+ silc_sfree(stack, data);
+ return NULL;
+ break;
+ case 2:
+ data[j++] = bits >> 10;
+ break;
+ case 3:
+ data[j++] = bits >> 16;
+ data[j++] = (bits >> 8) & 0xff;
+ break;
+ }
+
+ if (ret_len)
+ *ret_len = j;
+
+ return data;
+}
--- /dev/null
+/*
+
+ silcbase64.h
+
+ Author: Pekka Riikonen <priikone@silcnet.org>
+
+ Copyright (C) 2007 Pekka Riikonen
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+*/
+
+/****h* silcutil/SILC Base64 API
+ *
+ * DESCRIPTION
+ *
+ * This interface provides Base64 encoding and decoding routines.
+ *
+ ***/
+
+#ifndef SILCBASE64_H
+#define SILCBASE64_H
+
+/****f* silcutil/SilcBase64API/silc_base64_encode
+ *
+ * SYNOPSIS
+ *
+ * char *silc_base64_encode(SilcStack stack,
+ * unsigned char *data, SilcUInt32 len);
+ *
+ * DESCRIPTION
+ *
+ * Encodes data into Base 64 (PEM) encoding. Returns NULL terminated
+ * Base 64 encoded data string.
+ *
+ * If `stack' is non-NULL the returned buffer is allocated from `stack'.
+ *
+ ***/
+char *silc_base64_encode(SilcStack stack, unsigned char *data, SilcUInt32 len);
+
+/****f* silcutil/SilcBase64API/silc_base64_encode_file
+ *
+ * SYNOPSIS
+ *
+ * char *silc_base64_encode_file(SilcStack stack,
+ * unsigned char *data, SilcUInt32 data_len);
+ *
+ * DESCRIPTION
+ *
+ * Same as silc_base64_encode() but puts newline ('\n') every 72
+ * characters.
+ *
+ * If `stack' is non-NULL the returned buffer is allocated from `stack'.
+ *
+ ***/
+char *silc_base64_encode_file(SilcStack stack,
+ unsigned char *data, SilcUInt32 data_len);
+
+/****f* silcutil/SilcBase64API/silc_base_decode
+ *
+ * SYNOPSIS
+ *
+ * unsigned char *silc_base_decode(SilcStack stack,
+ * unsigned char *base64,
+ * SilcUInt32 base64_len,
+ * SilcUInt32 *ret_len);
+ *
+ * DESCRIPTION
+ *
+ * Decodes Base 64 (PEM) into data. Returns the decoded data.
+ *
+ * If `stack' is non-NULL the returned buffer is allocated from `stack'.
+ *
+ ***/
+unsigned char *silc_base64_decode(SilcStack stack,
+ unsigned char *base64,
+ SilcUInt32 base64_len,
+ SilcUInt32 *ret_len);
+
+#endif /* SILCBASE64_H */
#include "silc.h"
#include "silcstrutil.h"
-static unsigned char pem_enc[64] =
-"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
-/* Encodes data into Base 64 encoding. Returns NULL terminated base 64 encoded
- data string. */
-
-char *silc_base64_encode(unsigned char *data, SilcUInt32 len)
-{
- int i, j;
- SilcUInt32 bits, c, char_count;
- char *pem;
-
- char_count = 0;
- bits = 0;
- j = 0;
-
- pem = silc_calloc(((len * 8 + 5) / 6) + 5, sizeof(*pem));
-
- for (i = 0; i < len; i++) {
- c = data[i];
- bits += c;
- char_count++;
-
- if (char_count == 3) {
- pem[j++] = pem_enc[bits >> 18];
- pem[j++] = pem_enc[(bits >> 12) & 0x3f];
- pem[j++] = pem_enc[(bits >> 6) & 0x3f];
- pem[j++] = pem_enc[bits & 0x3f];
- bits = 0;
- char_count = 0;
- } else {
- bits <<= 8;
- }
- }
-
- if (char_count != 0) {
- bits <<= 16 - (8 * char_count);
- pem[j++] = pem_enc[bits >> 18];
- pem[j++] = pem_enc[(bits >> 12) & 0x3f];
-
- if (char_count == 1) {
- pem[j++] = '=';
- pem[j] = '=';
- } else {
- pem[j++] = pem_enc[(bits >> 6) & 0x3f];
- pem[j] = '=';
- }
- }
-
- return pem;
-}
-
-/* Same as above but puts newline ('\n') every 72 characters. */
-
-char *silc_base64_encode_file(unsigned char *data, SilcUInt32 data_len)
-{
- int i, j;
- SilcUInt32 len, cols;
- char *pem, *pem2;
-
- pem = silc_base64_encode(data, data_len);
- len = strlen(pem);
-
- pem2 = silc_calloc(len + (len / 72) + 1, sizeof(*pem2));
-
- for (i = 0, j = 0, cols = 1; i < len; i++, cols++) {
- if (cols == 72) {
- pem2[i] = '\n';
- cols = 0;
- len++;
- continue;
- }
-
- pem2[i] = pem[j++];
- }
-
- silc_free(pem);
- return pem2;
-}
-
-/* Decodes Base 64 into data. Returns the decoded data. */
-
-unsigned char *silc_base64_decode(unsigned char *base64,
- SilcUInt32 base64_len,
- SilcUInt32 *ret_len)
-{
- int i, j;
- SilcUInt32 len, c, char_count, bits;
- unsigned char *data;
- static char ialpha[256], decoder[256];
-
- for (i = 64 - 1; i >= 0; i--) {
- ialpha[pem_enc[i]] = 1;
- decoder[pem_enc[i]] = i;
- }
-
- char_count = 0;
- bits = 0;
- j = 0;
-
- if (!base64_len)
- len = strlen(base64);
- else
- len = base64_len;
-
- data = silc_calloc(((len * 6) / 8), sizeof(*data));
-
- for (i = 0; i < len; i++) {
- c = base64[i];
-
- if (c == '=')
- break;
-
- if (c > 127 || !ialpha[c])
- continue;
-
- bits += decoder[c];
- char_count++;
-
- if (char_count == 4) {
- data[j++] = bits >> 16;
- data[j++] = (bits >> 8) & 0xff;
- data[j++] = bits & 0xff;
- bits = 0;
- char_count = 0;
- } else {
- bits <<= 6;
- }
- }
-
- switch(char_count) {
- case 1:
- silc_free(data);
- return NULL;
- break;
- case 2:
- data[j++] = bits >> 10;
- break;
- case 3:
- data[j++] = bits >> 16;
- data[j++] = (bits >> 8) & 0xff;
- break;
- }
-
- if (ret_len)
- *ret_len = j;
-
- return data;
-}
-
/* Concatenates the `src' into `dest'. If `src_len' is more than the
size of the `dest' (minus NULL at the end) the `src' will be
truncated to fit. */
} SilcStringEncoding;
/***/
-/****f* silcutil/SilcStrUtilAPI/silc_base64_encode
- *
- * SYNOPSIS
- *
- * char *silc_base64_encode(unsigned char *data, SilcUInt32 len);
- *
- * DESCRIPTION
- *
- * Encodes data into Base 64 (PEM) encoding. Returns NULL terminated
- * Base 64 encoded data string.
- *
- ***/
-char *silc_base64_encode(unsigned char *data, SilcUInt32 len);
-
-/****f* silcutil/SilcStrUtilAPI/silc_base64_encode_file
- *
- * SYNOPSIS
- *
- * char *silc_base64_encode_file(unsigned char *data, SilcUInt32 data_len);
- *
- * DESCRIPTION
- *
- * Same as silc_base64_encode() but puts newline ('\n') every 72
- * characters.
- *
- ***/
-char *silc_base64_encode_file(unsigned char *data, SilcUInt32 data_len);
-
-/****f* silcutil/SilcStrUtilAPI/silc_base_decode
- *
- * SYNOPSIS
- *
- * unsigned char *silc_base_decode(unsigned char *base64,
- * SilcUInt32 base64_len,
- * SilcUInt32 *ret_len);
- *
- * DESCRIPTION
- *
- * Decodes Base 64 (PEM) into data. Returns the decoded data.
- *
- ***/
-unsigned char *silc_base64_decode(unsigned char *base64,
- SilcUInt32 base64_len,
- SilcUInt32 *ret_len);
-
/****f* silcutil/SilcStrStrUtilAPI/silc_strncat
*
* SYNOPSIS
projects / silc.git / commitdiff