res_stir_shaken: Add outbound INVITE support.

Integrated STIR/SHAKEN support with outgoing INVITEs. When an INVITE is
sent, the caller ID will be checked to see if there is a certificate
that corresponds to it. If so, that information will be retrieved and an
Identity header will be added to the SIP message. The format is:

header.payload.signature;info=<public_key_url>alg=ES256;ppt=shaken

Header, payload, and signature are all BASE64 encoded. The public key
URL is retrieved from the certificate. Currently the algorithm and ppt
are ES256 and shaken, respectively. This message is signed and can be
used for verification on the receiving end.

Two new configuration options have been added to the certificate object:
attestation and origid. The attestation is required and must be A, B, or
C. origid is the origination identifier.

A new utility function has been added as well that takes a string,
allocates space, BASE64 encodes it, then returns it, eliminating the
need to calculate the size yourself.

Change-Id: I1f84d6a5839cb2ed152ef4255b380cfc2de662b4

main/utils.c

@@ -398,6 +398,24 @@ int ast_base64encode(char *dst, const unsigned char *src, int srclen, int max)
 	return ast_base64encode_full(dst, src, srclen, max, 0);
 }
 
+/*! \brief Encode to BASE64 and return encoded string */
+char *ast_base64encode_string(const char *src)
+{
+	size_t encoded_len;
+	char *encoded_string;
+
+	if (ast_strlen_zero(src)) {
+		return NULL;
+	}
+
+	encoded_len = ((strlen(src) * 4 / 3 + 3) & ~3) + 1;
+	encoded_string = ast_calloc(1, encoded_len);
+
+	ast_base64encode(encoded_string, (const unsigned char *)src, strlen(src), encoded_len);
+
+	return encoded_string;
+}
+
 static void base64_init(void)
 {
 	int x;