--- /dev/null
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ */
+#include "tomcrypt.h"
+
+/**
+ @file base64_decode.c
+ Compliant base64 code donated by Wayne Scott (wscott@bitmover.com)
+ base64 URL Safe variant (RFC 4648 section 5) by Karel Miko
+*/
+
+
+#if defined(LTC_BASE64) || defined (LTC_BASE64_URL)
+
+#if defined(LTC_BASE64)
+static const unsigned char map_base64[256] = {
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
+255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
+ 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+ 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
+255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
+ 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
+ 49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255 };
+#endif /* LTC_BASE64 */
+
+static const unsigned char map_base64url[] = {
+#if defined(LTC_BASE64_URL)
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255, 255,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
+255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
+ 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+ 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 63,
+255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
+ 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
+ 49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+255, 255, 255, 255
+#endif /* LTC_BASE64_URL */
+};
+
+enum {
+ relaxed = 0,
+ strict = 1
+};
+
+static int _base64_decode_internal(const unsigned char *in, unsigned long inlen,
+ unsigned char *out, unsigned long *outlen,
+ const unsigned char *map, int is_strict)
+{
+ unsigned long t, x, y, z;
+ unsigned char c;
+ int g;
+
+ LTC_ARGCHK(in != NULL);
+ LTC_ARGCHK(out != NULL);
+ LTC_ARGCHK(outlen != NULL);
+
+ g = 0; /* '=' counter */
+ for (x = y = z = t = 0; x < inlen; x++) {
+ c = map[in[x]&0xFF];
+ if (c == 254) {
+ g++;
+ continue;
+ }
+ else if (is_strict && g > 0) {
+ /* we only allow '=' to be at the end */
+ return CRYPT_INVALID_PACKET;
+ }
+ if (c == 255) {
+ if (is_strict)
+ return CRYPT_INVALID_PACKET;
+ else
+ continue;
+ }
+
+ t = (t<<6)|c;
+
+ if (++y == 4) {
+ if (z + 3 > *outlen) return CRYPT_BUFFER_OVERFLOW;
+ out[z++] = (unsigned char)((t>>16)&255);
+ out[z++] = (unsigned char)((t>>8)&255);
+ out[z++] = (unsigned char)(t&255);
+ y = t = 0;
+ }
+ }
+
+ if (y != 0) {
+ if (y == 1) return CRYPT_INVALID_PACKET;
+ if ((y + g) != 4 && is_strict && map != map_base64url) return CRYPT_INVALID_PACKET;
+ t = t << (6 * (4 - y));
+ if (z + y - 1 > *outlen) return CRYPT_BUFFER_OVERFLOW;
+ if (y >= 2) out[z++] = (unsigned char) ((t >> 16) & 255);
+ if (y == 3) out[z++] = (unsigned char) ((t >> 8) & 255);
+ }
+ *outlen = z;
+ return CRYPT_OK;
+}
+
+#if defined(LTC_BASE64)
+/**
+ Relaxed base64 decode a block of memory
+ @param in The base64 data to decode
+ @param inlen The length of the base64 data
+ @param out [out] The destination of the binary decoded data
+ @param outlen [in/out] The max size and resulting size of the decoded data
+ @return CRYPT_OK if successful
+*/
+int base64_decode(const unsigned char *in, unsigned long inlen,
+ unsigned char *out, unsigned long *outlen)
+{
+ return _base64_decode_internal(in, inlen, out, outlen, map_base64, relaxed);
+}
+
+/**
+ Strict base64 decode a block of memory
+ @param in The base64 data to decode
+ @param inlen The length of the base64 data
+ @param out [out] The destination of the binary decoded data
+ @param outlen [in/out] The max size and resulting size of the decoded data
+ @return CRYPT_OK if successful
+*/
+int base64_strict_decode(const unsigned char *in, unsigned long inlen,
+ unsigned char *out, unsigned long *outlen)
+{
+ return _base64_decode_internal(in, inlen, out, outlen, map_base64, strict);
+}
+#endif /* LTC_BASE64 */
+
+#if defined(LTC_BASE64_URL)
+/**
+ Relaxed base64 (URL Safe, RFC 4648 section 5) decode a block of memory
+ @param in The base64 data to decode
+ @param inlen The length of the base64 data
+ @param out [out] The destination of the binary decoded data
+ @param outlen [in/out] The max size and resulting size of the decoded data
+ @return CRYPT_OK if successful
+*/
+int base64url_decode(const unsigned char *in, unsigned long inlen,
+ unsigned char *out, unsigned long *outlen)
+{
+ return _base64_decode_internal(in, inlen, out, outlen, map_base64url, relaxed);
+}
+
+/**
+ Strict base64 (URL Safe, RFC 4648 section 5) decode a block of memory
+ @param in The base64 data to decode
+ @param inlen The length of the base64 data
+ @param out [out] The destination of the binary decoded data
+ @param outlen [in/out] The max size and resulting size of the decoded data
+ @return CRYPT_OK if successful
+*/
+int base64url_strict_decode(const unsigned char *in, unsigned long inlen,
+ unsigned char *out, unsigned long *outlen)
+{
+ return _base64_decode_internal(in, inlen, out, outlen, map_base64url, strict);
+}
+#endif /* LTC_BASE64_URL */
+
+#endif
+
+
+/* ref: $Format:%D$ */
+/* git commit: $Format:%H$ */
+/* commit time: $Format:%ai$ */
projects / zpackage / blobdiff