That Curve25519 implementation is by Moxie Marlinspike, and that RipeMD160 algorithm is built into BouncyCastle.
There may still be attack vectors on them, but that's about as close to "reviewed by professional cryptographers" as you're likely to get at this point.
There may still be attack vectors on them, but that's about as close to "reviewed by professional cryptographers" as you're likely to get at this point.