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/* 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_encode.c
Compliant base64 encoder 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 char * const codes_base64 =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
#endif /* LTC_BASE64 */
#if defined(LTC_BASE64_URL)
static const char * const codes_base64url =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
#endif /* LTC_BASE64_URL */
static int _base64_encode_internal(const unsigned char *in, unsigned long inlen,
unsigned char *out, unsigned long *outlen,
const char *codes, int pad)
{
unsigned long i, len2, leven;
unsigned char *p;
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(out != NULL);
LTC_ARGCHK(outlen != NULL);
/* valid output size ? */
len2 = 4 * ((inlen + 2) / 3);
if (*outlen < len2 + 1) {
*outlen = len2 + 1;
return CRYPT_BUFFER_OVERFLOW;
}
p = out;
leven = 3*(inlen / 3);
for (i = 0; i < leven; i += 3) {
*p++ = codes[(in[0] >> 2) & 0x3F];
*p++ = codes[(((in[0] & 3) << 4) + (in[1] >> 4)) & 0x3F];
*p++ = codes[(((in[1] & 0xf) << 2) + (in[2] >> 6)) & 0x3F];
*p++ = codes[in[2] & 0x3F];
in += 3;
}
/* Pad it if necessary... */
if (i < inlen) {
unsigned a = in[0];
unsigned b = (i+1 < inlen) ? in[1] : 0;
*p++ = codes[(a >> 2) & 0x3F];
*p++ = codes[(((a & 3) << 4) + (b >> 4)) & 0x3F];
if (pad) {
*p++ = (i+1 < inlen) ? codes[(((b & 0xf) << 2)) & 0x3F] : '=';
*p++ = '=';
}
else {
if (i+1 < inlen) *p++ = codes[(((b & 0xf) << 2)) & 0x3F];
}
}
/* append a NULL byte */
*p = '\0';
/* return ok */
*outlen = (unsigned long)(p - out);
return CRYPT_OK;
}
#if defined(LTC_BASE64)
/**
base64 Encode a buffer (NUL terminated)
@param in The input buffer to encode
@param inlen The length of the input buffer
@param out [out] The destination of the base64 encoded data
@param outlen [in/out] The max size and resulting size
@return CRYPT_OK if successful
*/
int base64_encode(const unsigned char *in, unsigned long inlen,
unsigned char *out, unsigned long *outlen)
{
return _base64_encode_internal(in, inlen, out, outlen, codes_base64, 1);
}
#endif /* LTC_BASE64 */
#if defined(LTC_BASE64_URL)
/**
base64 (URL Safe, RFC 4648 section 5) Encode a buffer (NUL terminated)
@param in The input buffer to encode
@param inlen The length of the input buffer
@param out [out] The destination of the base64 encoded data
@param outlen [in/out] The max size and resulting size
@return CRYPT_OK if successful
*/
int base64url_encode(const unsigned char *in, unsigned long inlen,
unsigned char *out, unsigned long *outlen)
{
return _base64_encode_internal(in, inlen, out, outlen, codes_base64url, 0);
}
int base64url_strict_encode(const unsigned char *in, unsigned long inlen,
unsigned char *out, unsigned long *outlen)
{
return _base64_encode_internal(in, inlen, out, outlen, codes_base64url, 1);
}
#endif /* LTC_BASE64_URL */
#endif
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */
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