Function base64encode

ut.c:298–324

function that encodes to base64 * output buffer is assumed to have the right length */

/* function that encodes to base64
 * output buffer is assumed to have the right length */
void base64encode(unsigned char *out, unsigned char *in, int inlen)
{
	for (; inlen >= 3; inlen -= 3)
	{
		*out++ = base64digits[in[0] >> 2];
		*out++ = base64digits[((in[0] << 4) & 0x30) | (in[1] >> 4)];
		*out++ = base64digits[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
		*out++ = base64digits[in[2] & 0x3f];
		in += 3;
	}

	if (inlen > 0)
	{
		unsigned char fragment;

		*out++ = base64digits[in[0] >> 2];
		fragment = (in[0] << 4) & 0x30;

		if (inlen > 1)
			fragment |= in[1] >> 4;

		*out++ = base64digits[fragment];
		*out++ = (inlen < 2) ? '=' : base64digits[(in[1] << 2) & 0x3c];
		*out++ = '=';

	}
}

/* function that encodes to base64URL
 * output buffer is assumed to have the right length */