Implement CryptoRng for EntropyRng and StdRng

Author: pitdicker

src/entropy_rng.rs

@@ -10,7 +10,7 @@
 
 //! Entropy generator, or wrapper around external generators
 
-use rand_core::{RngCore, Error, impls};
+use rand_core::{RngCore, CryptoRng, Error, impls};
 use {OsRng, JitterRng};
 
 /// An RNG provided specifically for seeding PRNGs.
@@ -140,6 +140,8 @@ impl RngCore for EntropyRng {
     }
 }
 
+impl CryptoRng for EntropyRng {}
+
 #[cfg(test)]
 mod test {
     use super::*;

src/lib.rs

@@ -865,6 +865,8 @@ impl SeedableRng for StdRng {
     }
 }
 
+impl CryptoRng for StdRng {}
+
 /// An RNG recommended when small state, cheap initialization and good
 /// performance are required. The PRNG algorithm in `SmallRng` is chosen to be
 /// efficient on the current platform, **without consideration for cryptography