Added test vectors for StdRng, verified using rand_chacha.

src/rngs/std.rs

@@ -101,7 +101,7 @@ impl CryptoRng for StdRng {}
 #[cfg(test)]
 mod test {
     use crate::rngs::StdRng;
-    use crate::{RngCore, SeedableRng};
+    use crate::{Rng, RngCore, SeedableRng};
 
     #[test]
     fn test_stdrng_construction() {
@@ -114,11 +114,172 @@ mod test {
         let target = [10719222850664546238, 14064965282130556830];
 
         let mut rng0 = StdRng::from_seed(seed);
+
         let x0 = rng0.next_u64();
 
         let mut rng1 = StdRng::from_rng(&mut rng0);
         let x1 = rng1.next_u64();
 
         assert_eq!([x0, x1], target);
     }
+
+    #[test]
+    fn test_chacha_true_values_1() {
+        // Source: Strombergson 2013, Test Vectors for the Stream Cipher ChaCha
+        // draft-strombergson-chacha-test-vectors-01
+        // https://datatracker.ietf.org/doc/html/draft-strombergson-chacha-test-vectors-01
+        // Converted to LE u128 form (four u128 to one block).
+        // TC: all zero key and IV, rounds 12, 256-bit key
+
+        let seed = [0u8; 32];
+        let mut rng = StdRng::from_seed(seed);
+
+        let mut results = [0u128; 8];
+        rng.fill(&mut results);
+        let expected = [
+            0xd583265f12ce1f8153f955076a9af49b,
+            0x5f15ae2ea589007e1474e049bbc32904,
+            0x798cfaac3428e82cc0e37ad279f86405,
+            0xbe2613412fe80b611969dea02c9f623a,
+            0x3d17e08c3371fc86fe743e204188d50b,
+            0xb489c04c21851515cccbbd19b7eb28c6,
+            0x43c88c1b97b802c611f14ca1cd8d2542,
+            0x1693e617b0a64427c0515190ca461ee9,
+        ];
+        assert_eq!(results, expected);
+
+        assert_eq!(rng.0.get_word_pos(), 32);
+    }
+
+    #[test]
+    fn test_chacha_true_values_2() {
+        // Source: Strombergson 2013, Test Vectors for the Stream Cipher ChaCha
+        // TC2: single bit set in key, all zero IV, rounds 12, 256-bit key
+
+        let mut seed = [0u8; 32];
+        seed[0] = 1;
+        let mut rng = StdRng::from_seed(seed);
+
+        let mut results = [0u128; 8];
+        rng.fill(&mut results);
+        let expected = [
+            0x9a225cdf090f0eef6b0565d596e0512,
+            0x10dd4d0bff1802930f5d5290278c2449,
+            0xfefdfe067d7a109ee254a4d9392200a6,
+            0xc029dc60c972179bf2f944a0eb0f21f0,
+            0x2a37692ab05e660e2404c6cbc566730c,
+            0xc8a72980b8c4c72a0978bb6fb279f97a,
+            0xaf15ba8e302e43907dfcbb17c23b5154,
+            0xa9177125baafe601560d10ef48eb5ac6,
+        ];
+        assert_eq!(results, expected);
+
+        assert_eq!(rng.0.get_word_pos(), 32);
+    }
+
+    #[test]
+    fn test_chacha_true_values_3() {
+        // Source: Strombergson 2013, Test Vectors for the Stream Cipher ChaCha
+        // TC3: all zero key, single bit set in IV, rounds 12, 256-bit key
+
+        let seed = [0u8; 32];
+        let mut rng = StdRng::from_seed(seed);
+        rng.0.set_stream(1);
+
+        let mut results = [0u128; 8];
+        rng.fill(&mut results);
+        let expected = [
+            0x3de08d69eff7ba6d4b8c827bf8bdb864,
+            0x6929e19be5ad36988f411457633fb3f8,
+            0xa5995d1de898cb9efccf8ef3a053c946,
+            0xf1d8f021fb3f31ee4b9450a9a8ffced,
+            0x28886a59a2b923fe42c422f2a7b49d55,
+            0x23c72a9150a17ca76e8963134fee2251,
+            0x67b7d07029cb2037e802f6a024bf0bf,
+            0x6fa2523bbd836d3a01c8137c82b91afc,
+        ];
+        assert_eq!(results, expected);
+
+        assert_eq!(rng.0.get_word_pos(), 32);
+    }
+
+    #[test]
+    fn test_chacha_true_values_8() {
+        // Source: Strombergson 2013, Test Vectors for the Stream Cipher ChaCha
+        // TC8: key: 'All your base are belong to us!', IV: IETF2013, rounds 12, 256-bit key
+
+        #[rustfmt::skip]
+        let seed = [
+            0xc4, 0x6e, 0xc1, 0xb1, 0x8c, 0xe8, 0xa8, 0x78,
+            0x72, 0x5a, 0x37, 0xe7, 0x80, 0xdf, 0xb7, 0x35,
+            0x1f, 0x68, 0xed, 0x2e, 0x19, 0x4c, 0x79, 0xfb,
+            0xc6, 0xae, 0xbe, 0xe1, 0xa6, 0x67, 0x97, 0x5d,
+        ];
+        let iv = [0x1a, 0xda, 0x31, 0xd5, 0xcf, 0x68, 0x82, 0x21];
+        let mut rng = StdRng::from_seed(seed);
+        rng.0.set_stream(u64::from_le_bytes(iv));
+
+        let mut results = [0u128; 8];
+        rng.fill(&mut results);
+        let expected = [
+            0x10c08b11dc3be7b4066dbc8427078214,
+            0xc19c7e1f25aa8669e018a96c7876793c,
+            0x207c8db0992e2d24b483ee160a9a74b2,
+            0xabfb0f9db3b1613b28876c46bc802b09,
+            0x5495b60d624f9e9b32dbebc16b114bd9,
+            0x31d66e96ad465a970c3d47689b3d8e4a,
+            0x3c11e5a1df7a04d8c7ead50a53ff2ae4,
+            0x2ba4a57be08f1cac89d1f183b8e3f391,
+        ];
+        assert_eq!(results, expected);
+
+        assert_eq!(rng.0.get_word_pos(), 32);
+    }
+
+    #[test]
+    fn test_chacha_counter() {
+        // Source: rand_chacha implementation
+        // We test six blocks: counter=u32::MAX, four blocks from 2^32 (backends
+        // which yield four blocks at a time may need to handle this specially)
+        // and the first block after this wrap-logic completes.
+        // Test: all zero key and IV, block set to u32::MAX, rounds 12, 256-bit key
+
+        let seed = [0u8; 32];
+        let mut rng = StdRng::from_seed(seed);
+        let block = u32::MAX;
+        let words_per_block = 16;
+        rng.0.set_word_pos((block as u128) * words_per_block);
+
+        let mut results = [0u128; 4 * 6];
+        rng.fill(&mut results);
+        let expected = [
+            0xf106e2fcbb524248292ac9f150afa6d7,
+            0x12032ef6c183b50a83a3309513dd017d,
+            0x2c93ff300438eaed6c958a9aa1619382,
+            0x74fc0624270ab858508377945edb52d0,
+            0xe5f4f4a8b8810524264d8911dc537bcc,
+            0x18a6a6cbdc1f823fb1231280056740af,
+            0xabdae0a44b1f45edbccc83dcd3f8638a,
+            0xad6b649f12f70de567cc39740dbb8a22,
+            0x37512785327825dc30ecfaf37a38f5a0,
+            0x5af852d2df0dc286c2dd19af39b54e39,
+            0xb04dc185c27497ac9f4a4f6769d1b5d,
+            0x816492be66439cecd2498c9865284377,
+            0x724fe95e0b6cbb8a55b707c06166147f,
+            0xe3e7cda19d92b5318024abb34aa31329,
+            0x1a3594d7283c077017cd511144bf3db3,
+            0x99ab26cf14f38b11d78e413bdce6424c,
+            0x553deaed89d3bf630de05408c0f655e8,
+            0x86c46a5676fef18f0dc0dff3ee16507c,
+            0xd33d6cf5ade97b000b29e3ce614faf51,
+            0x5b62dcc48c0fc60326afc5783c40d40c,
+            0x44eedc777ed030f43d382d4921eba244,
+            0xa2d66a5893ade34a0d17c706e8d89dba,
+            0xd229d1f3a07526e47cabd035135012fd,
+            0xefae0722059b654dea6945547e535052,
+        ];
+        assert_eq!(results, expected);
+
+        assert_eq!(rng.0.get_word_pos(), (block as u128) * words_per_block + 96);
+    }
 }