diff --git a/Cargo.lock b/Cargo.lock
index 3ea81ef77..b49fde6c3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -51,7 +51,7 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4cf01b9b56e767bb57b94ebf91a58b338002963785cdd7013e21c0d4679471e4"
 dependencies = [
- "generic-array",
+ "generic-array 0.12.3",
 ]
 
 [[package]]
@@ -60,8 +60,8 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "54eb1d8fe354e5fc611daf4f2ea97dd45a765f4f1e4512306ec183ae2e8f20c9"
 dependencies = [
- "aes-soft",
- "aesni",
+ "aes-soft 0.3.3",
+ "aesni 0.6.0",
  "block-cipher-trait",
 ]
 
@@ -71,10 +71,22 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d2e5b0458ea3beae0d1d8c0f3946564f8e10f90646cf78c06b4351052058d1ee"
 dependencies = [
- "aes-soft",
- "aesni",
- "ctr",
- "stream-cipher",
+ "aes-soft 0.3.3",
+ "aesni 0.6.0",
+ "ctr 0.3.2",
+ "stream-cipher 0.3.2",
+]
+
+[[package]]
+name = "aes-ctr"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "92e60aeefd2a0243bd53a42e92444e039f67c3d7f0382c9813577696e7c10bf3"
+dependencies = [
+ "aes-soft 0.4.0",
+ "aesni 0.7.0",
+ "ctr 0.4.0",
+ "stream-cipher 0.4.1",
 ]
 
 [[package]]
@@ -102,6 +114,17 @@ dependencies = [
  "opaque-debug",
 ]
 
+[[package]]
+name = "aes-soft"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4925647ee64e5056cf231608957ce7c81e12d6d6e316b9ce1404778cc1d35fa7"
+dependencies = [
+ "block-cipher",
+ "byteorder",
+ "opaque-debug",
+]
+
 [[package]]
 name = "aesni"
 version = "0.6.0"
@@ -110,7 +133,18 @@ checksum = "2f70a6b5f971e473091ab7cfb5ffac6cde81666c4556751d8d5620ead8abf100"
 dependencies = [
  "block-cipher-trait",
  "opaque-debug",
- "stream-cipher",
+ "stream-cipher 0.3.2",
+]
+
+[[package]]
+name = "aesni"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d050d39b0b7688b3a3254394c3e30a9d66c41dcf9b05b0e2dbdc623f6505d264"
+dependencies = [
+ "block-cipher",
+ "opaque-debug",
+ "stream-cipher 0.4.1",
 ]
 
 [[package]]
@@ -397,8 +431,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "94cb07b0da6a73955f8fb85d24c466778e70cda767a568229b104f0264089330"
 dependencies = [
  "byte-tools",
- "crypto-mac",
- "digest",
+ "crypto-mac 0.7.0",
+ "digest 0.8.1",
  "opaque-debug",
 ]
 
@@ -433,7 +467,28 @@ dependencies = [
  "block-padding",
  "byte-tools",
  "byteorder",
- "generic-array",
+ "generic-array 0.12.3",
+]
+
+[[package]]
+name = "block-buffer"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dbcf92448676f82bb7a334c58bbce8b0d43580fb5362a9d608b18879d12a3d31"
+dependencies = [
+ "block-padding",
+ "byte-tools",
+ "byteorder",
+ "generic-array 0.14.2",
+]
+
+[[package]]
+name = "block-cipher"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa136449e765dc7faa244561ccae839c394048667929af599b5d931ebe7b7f10"
+dependencies = [
+ "generic-array 0.14.2",
 ]
 
 [[package]]
@@ -442,7 +497,7 @@ version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1c924d49bd09e7c06003acda26cd9742e796e34282ec6c1189404dee0c1f4774"
 dependencies = [
- "generic-array",
+ "generic-array 0.12.3",
 ]
 
 [[package]]
@@ -609,7 +664,7 @@ version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f6a7ae4c498f8447d86baef0fa0831909333f558866fabcb21600625ac5a31c7"
 dependencies = [
- "stream-cipher",
+ "stream-cipher 0.3.2",
  "zeroize",
 ]
 
@@ -622,7 +677,7 @@ dependencies = [
  "aead",
  "chacha20",
  "poly1305",
- "stream-cipher",
+ "stream-cipher 0.3.2",
  "zeroize",
 ]
 
@@ -936,10 +991,20 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4434400df11d95d556bac068ddfedd482915eb18fe8bea89bc80b6e4b1c179e5"
 dependencies = [
- "generic-array",
+ "generic-array 0.12.3",
  "subtle 1.0.0",
 ]
 
+[[package]]
+name = "crypto-mac"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b584a330336237c1eecd3e94266efb216c56ed91225d634cb2991c5f3fd1aeab"
+dependencies = [
+ "generic-array 0.14.2",
+ "subtle 2.2.3",
+]
+
 [[package]]
 name = "csv"
 version = "1.1.3"
@@ -969,7 +1034,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "022cd691704491df67d25d006fe8eca083098253c4d43516c2206479c58c6736"
 dependencies = [
  "block-cipher-trait",
- "stream-cipher",
+ "stream-cipher 0.3.2",
+]
+
+[[package]]
+name = "ctr"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3592740fd55aaf61dd72df96756bd0d11e6037b89dcf30ae2e1895b267692be"
+dependencies = [
+ "stream-cipher 0.4.1",
 ]
 
 [[package]]
@@ -989,7 +1063,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5d85653f070353a16313d0046f173f70d1aadd5b42600a14de626f0dfb3473a5"
 dependencies = [
  "byteorder",
- "digest",
+ "digest 0.8.1",
  "rand_core 0.5.1",
  "subtle 2.2.3",
  "zeroize",
@@ -1078,7 +1152,16 @@ version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f3d0c8c8752312f9713efd397ff63acb9f85585afbf179282e720e7704954dd5"
 dependencies = [
- "generic-array",
+ "generic-array 0.12.3",
+]
+
+[[package]]
+name = "digest"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
+dependencies = [
+ "generic-array 0.14.2",
 ]
 
 [[package]]
@@ -1116,7 +1199,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "66319abef3e2f4dc434bf0c9bcb5dee5907d7fece3327dfd7da82db905d02441"
 dependencies = [
  "arrayvec",
- "digest",
+ "digest 0.8.1",
  "enr",
  "fnv",
  "futures 0.3.5",
@@ -1133,7 +1216,7 @@ dependencies = [
  "parking_lot 0.10.2",
  "rand 0.7.3",
  "rlp",
- "sha2",
+ "sha2 0.8.2",
  "smallvec 1.4.0",
  "tokio 0.2.21",
  "uint",
@@ -1161,7 +1244,7 @@ dependencies = [
  "clear_on_drop",
  "curve25519-dalek",
  "rand 0.7.3",
- "sha2",
+ "sha2 0.8.2",
 ]
 
 [[package]]
@@ -1325,7 +1408,7 @@ dependencies = [
  "lazy_static",
  "ring",
  "rustc-hex",
- "sha2",
+ "sha2 0.8.2",
  "wasm-bindgen-test",
 ]
 
@@ -1352,7 +1435,7 @@ dependencies = [
  "hex 0.3.2",
  "num-bigint-dig",
  "ring",
- "rust-crypto",
+ "sha2 0.9.0",
  "zeroize",
 ]
 
@@ -1360,15 +1443,19 @@ dependencies = [
 name = "eth2_keystore"
 version = "0.1.0"
 dependencies = [
+ "aes-ctr 0.4.0",
  "bls",
  "eth2_key_derivation",
  "eth2_ssz",
  "hex 0.3.2",
+ "hmac 0.8.0",
+ "pbkdf2 0.4.0",
  "rand 0.7.3",
- "rust-crypto",
+ "scrypt",
  "serde",
  "serde_json",
  "serde_repr",
+ "sha2 0.9.0",
  "tempfile",
  "uuid",
  "zeroize",
@@ -1398,7 +1485,7 @@ dependencies = [
  "parking_lot 0.10.2",
  "serde",
  "serde_derive",
- "sha2",
+ "sha2 0.8.2",
  "slog",
  "slog-async",
  "slog-stdlog",
@@ -1811,6 +1898,16 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "generic-array"
+version = "0.14.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac746a5f3bbfdadd6106868134545e684693d54d9d44f6e9588a7d54af0bf980"
+dependencies = [
+ "typenum",
+ "version_check 0.9.2",
+]
+
 [[package]]
 name = "genesis"
 version = "0.1.2"
@@ -1980,8 +2077,8 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3fa08a006102488bd9cd5b8013aabe84955cf5ae22e304c2caf655b633aefae3"
 dependencies = [
- "digest",
- "hmac",
+ "digest 0.8.1",
+ "hmac 0.7.1",
 ]
 
 [[package]]
@@ -1990,8 +2087,18 @@ version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5dcb5e64cda4c23119ab41ba960d1e170a774c8e4b9d9e6a9bc18aabf5e59695"
 dependencies = [
- "crypto-mac",
- "digest",
+ "crypto-mac 0.7.0",
+ "digest 0.8.1",
+]
+
+[[package]]
+name = "hmac"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b87b580bd66811cc2324a27f3587de707cacf7525b96dca8122f7493e6cce0da"
+dependencies = [
+ "crypto-mac 0.8.0",
+ "digest 0.9.0",
 ]
 
 [[package]]
@@ -2000,9 +2107,9 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c6e570451493f10f6581b48cdd530413b63ea9e780f544bfd3bdcaa0d89d1a7b"
 dependencies = [
- "digest",
- "generic-array",
- "hmac",
+ "digest 0.8.1",
+ "generic-array 0.12.3",
+ "hmac 0.7.1",
 ]
 
 [[package]]
@@ -2469,7 +2576,7 @@ dependencies = [
  "rand 0.7.3",
  "ring",
  "rw-stream-sink",
- "sha2",
+ "sha2 0.8.2",
  "smallvec 1.4.0",
  "thiserror",
  "unsigned-varint 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2502,7 +2609,7 @@ dependencies = [
  "rand 0.7.3",
  "ring",
  "rw-stream-sink",
- "sha2",
+ "sha2 0.8.2",
  "smallvec 1.4.0",
  "thiserror",
  "unsigned-varint 0.4.0",
@@ -2547,7 +2654,7 @@ dependencies = [
  "prost",
  "prost-build",
  "rand 0.7.3",
- "sha2",
+ "sha2 0.8.2",
  "smallvec 1.4.0",
  "unsigned-varint 0.4.0",
  "wasm-timer",
@@ -2596,7 +2703,7 @@ dependencies = [
  "prost",
  "prost-build",
  "rand 0.7.3",
- "sha2",
+ "sha2 0.8.2",
  "snow",
  "static_assertions",
  "x25519-dalek",
@@ -2608,10 +2715,10 @@ name = "libp2p-secio"
 version = "0.19.2"
 source = "git+https://github.com/sigp/rust-libp2p?rev=a6232506278b9e686248f8d04b79400861b143c2#a6232506278b9e686248f8d04b79400861b143c2"
 dependencies = [
- "aes-ctr",
- "ctr",
+ "aes-ctr 0.3.0",
+ "ctr 0.3.2",
  "futures 0.3.5",
- "hmac",
+ "hmac 0.7.1",
  "js-sys",
  "lazy_static",
  "libp2p-core 0.19.2",
@@ -2624,7 +2731,7 @@ dependencies = [
  "rand 0.7.3",
  "ring",
  "rw-stream-sink",
- "sha2",
+ "sha2 0.8.2",
  "static_assertions",
  "twofish",
  "wasm-bindgen",
@@ -2700,10 +2807,10 @@ checksum = "1fc1e2c808481a63dc6da2074752fdd4336a3c8fcc68b83db6f1fd5224ae7962"
 dependencies = [
  "arrayref",
  "crunchy",
- "digest",
+ "digest 0.8.1",
  "hmac-drbg",
  "rand 0.7.3",
- "sha2",
+ "sha2 0.8.2",
  "subtle 2.2.3",
  "typenum",
 ]
@@ -3018,9 +3125,9 @@ checksum = "f75db05d738947aa5389863aadafbcf2e509d7ba099dc2ddcdf4fc66bf7a9e03"
 dependencies = [
  "blake2b_simd",
  "blake2s_simd",
- "digest",
+ "digest 0.8.1",
  "sha-1",
- "sha2",
+ "sha2 0.8.2",
  "sha3",
  "unsigned-varint 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -3423,7 +3530,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "006c038a43a45995a9670da19e67600114740e8511d4333bf97a56e66a7542d9"
 dependencies = [
  "byteorder",
- "crypto-mac",
+ "crypto-mac 0.7.0",
+]
+
+[[package]]
+name = "pbkdf2"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "216eaa586a190f0a738f2f918511eecfa90f13295abec0e457cdebcceda80cbd"
+dependencies = [
+ "crypto-mac 0.8.0",
 ]
 
 [[package]]
@@ -3753,16 +3869,6 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "def50a86306165861203e7f84ecffbbdfdea79f0e51039b33de1e952358c47ac"
 
-[[package]]
-name = "rand"
-version = "0.3.23"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "64ac302d8f83c0c1974bf758f6b041c6c8ada916fbb44a609158ca8b064cc76c"
-dependencies = [
- "libc",
- "rand 0.4.6",
-]
-
 [[package]]
 name = "rand"
 version = "0.4.6"
@@ -4112,19 +4218,6 @@ dependencies = [
  "crossbeam-utils",
 ]
 
-[[package]]
-name = "rust-crypto"
-version = "0.2.36"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f76d05d3993fd5f4af9434e8e436db163a12a9d40e1a58a726f27a01dfd12a2a"
-dependencies = [
- "gcc",
- "libc",
- "rand 0.3.23",
- "rustc-serialize",
- "time 0.1.43",
-]
-
 [[package]]
 name = "rustc-demangle"
 version = "0.1.16"
@@ -4143,12 +4236,6 @@ version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3e75f6a532d0fd9f7f13144f392b6ad56a32696bfcd9c78f797f16bbb6f072d6"
 
-[[package]]
-name = "rustc-serialize"
-version = "0.3.24"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcf128d1287d2ea9d80910b5f1120d0b8eede3fbf1abe91c40d39ea7d51e6fda"
-
 [[package]]
 name = "rustc_version"
 version = "0.2.3"
@@ -4244,6 +4331,17 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
+[[package]]
+name = "scrypt"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83ecb7ed8e2266bd539feb932c52b9e7ce01d14384166ac50fecb173f762f1aa"
+dependencies = [
+ "hmac 0.8.0",
+ "pbkdf2 0.4.0",
+ "sha2 0.9.0",
+]
+
 [[package]]
 name = "sct"
 version = "0.6.0"
@@ -4396,8 +4494,8 @@ version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f7d94d0bede923b3cea61f3f1ff57ff8cdfd77b400fb8f9998949e0cf04163df"
 dependencies = [
- "block-buffer",
- "digest",
+ "block-buffer 0.7.3",
+ "digest 0.8.1",
  "fake-simd",
  "opaque-debug",
 ]
@@ -4414,8 +4512,20 @@ version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a256f46ea78a0c0d9ff00077504903ac881a1dafdc20da66545699e7776b3e69"
 dependencies = [
- "block-buffer",
- "digest",
+ "block-buffer 0.7.3",
+ "digest 0.8.1",
+ "fake-simd",
+ "opaque-debug",
+]
+
+[[package]]
+name = "sha2"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72377440080fd008550fe9b441e854e43318db116f90181eef92e9ae9aedab48"
+dependencies = [
+ "block-buffer 0.8.0",
+ "digest 0.9.0",
  "fake-simd",
  "opaque-debug",
 ]
@@ -4426,9 +4536,9 @@ version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd26bc0e7a2e3a7c959bc494caf58b72ee0c71d67704e9520f736ca7e4853ecf"
 dependencies = [
- "block-buffer",
+ "block-buffer 0.7.3",
  "byte-tools",
- "digest",
+ "digest 0.8.1",
  "keccak",
  "opaque-debug",
 ]
@@ -4658,7 +4768,7 @@ dependencies = [
  "rand_core 0.5.1",
  "ring",
  "rustc_version",
- "sha2",
+ "sha2 0.8.2",
  "subtle 2.2.3",
  "x25519-dalek",
 ]
@@ -4828,7 +4938,17 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8131256a5896cabcf5eb04f4d6dacbe1aefda854b0d9896e09cb58829ec5638c"
 dependencies = [
- "generic-array",
+ "generic-array 0.12.3",
+]
+
+[[package]]
+name = "stream-cipher"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09f8ed9974042b8c3672ff3030a69fcc03b74c47c3d1ecb7755e8a3626011e88"
+dependencies = [
+ "block-cipher",
+ "generic-array 0.14.2",
 ]
 
 [[package]]
@@ -5060,12 +5180,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b0165e045cc2ae1660270ca65e1676dbaab60feb0f91b10f7d0665e9b47e31f2"
 dependencies = [
  "failure",
- "hmac",
+ "hmac 0.7.1",
  "once_cell",
- "pbkdf2",
+ "pbkdf2 0.3.0",
  "rand 0.7.3",
  "rustc-hash",
- "sha2",
+ "sha2 0.8.2",
  "unicode-normalization",
 ]
 
@@ -5632,7 +5752,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "df0c900f2f9b4116803415878ff48b63da9edb268668e08cf9292d7503114a01"
 dependencies = [
- "generic-array",
+ "generic-array 0.12.3",
  "subtle 2.2.3",
 ]
 
diff --git a/crypto/eth2_key_derivation/Cargo.toml b/crypto/eth2_key_derivation/Cargo.toml
index c0607fff9..087d4320f 100644
--- a/crypto/eth2_key_derivation/Cargo.toml
+++ b/crypto/eth2_key_derivation/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-rust-crypto = "0.2.36"
+sha2 = "0.9.0"
 zeroize = { version = "1.0.0", features = ["zeroize_derive"] }
 num-bigint-dig = { version = "0.6.0", features = ["zeroize"] }
 ring = "0.16.9"
diff --git a/crypto/eth2_key_derivation/src/derived_key.rs b/crypto/eth2_key_derivation/src/derived_key.rs
index ecc31e64b..16e20cbe3 100644
--- a/crypto/eth2_key_derivation/src/derived_key.rs
+++ b/crypto/eth2_key_derivation/src/derived_key.rs
@@ -1,7 +1,7 @@
 use crate::{lamport_secret_key::LamportSecretKey, secret_bytes::SecretBytes, SecretHash};
-use crypto::{digest::Digest, sha2::Sha256};
 use num_bigint_dig::BigUint;
 use ring::hkdf::{KeyType, Prk, Salt, HKDF_SHA256};
+use sha2::{Digest, Sha256};
 use zeroize::Zeroize;
 
 /// The byte size of a SHA256 hash.
@@ -126,14 +126,16 @@ fn parent_sk_to_lamport_pk(ikm: &[u8], index: u32) -> SecretHash {
         .enumerate()
         .for_each(|(i, chunk)| {
             let mut hasher = Sha256::new();
-            hasher.input(chunk);
-            hasher.result(&mut pk_bytes[i * HASH_SIZE..(i + 1) * HASH_SIZE]);
+            hasher.update(chunk);
+            pk_bytes[i * HASH_SIZE..(i + 1) * HASH_SIZE].copy_from_slice(&hasher.finalize());
         });
 
     let mut compressed_lamport_pk = SecretHash::zero();
     let mut hasher = Sha256::new();
-    hasher.input(lamport_pk.as_bytes());
-    hasher.result(compressed_lamport_pk.as_mut_bytes());
+    hasher.update(lamport_pk.as_bytes());
+    compressed_lamport_pk
+        .as_mut_bytes()
+        .copy_from_slice(&hasher.finalize());
 
     compressed_lamport_pk
 }
diff --git a/crypto/eth2_key_derivation/src/path.rs b/crypto/eth2_key_derivation/src/path.rs
deleted file mode 100644
index 699278fb3..000000000
--- a/crypto/eth2_key_derivation/src/path.rs
+++ /dev/null
@@ -1,686 +0,0 @@
-use crate::{lamport_secret_key::LamportSecretKey, plain_text::PlainText};
-use crypto::{digest::Digest, sha2::Sha256};
-use num_bigint::BigUint;
-
-/// The byte size of a SHA256 hash.
-pub const HASH_SIZE: usize = 32;
-/// The size of the lamport array.
-pub const LAMPORT_ARRAY_SIZE: u8 = 255;
-
-pub const R: &str = "52435875175126190479447740508185965837690552500527637822603658699938581184513";
-
-fn derive_master_sk(seed: &[u8]) -> [u8; HASH_SIZE] {
-    hkdf_mod_r(seed)
-}
-
-fn derive_child_sk(parent_sk: &[u8], index: u32) -> [u8; HASH_SIZE] {
-    let compressed_lamport_pk = parent_sk_to_lamport_pk(parent_sk, index);
-    hkdf_mod_r(&compressed_lamport_pk)
-}
-
-fn hkdf_mod_r(ikm: &[u8]) -> [u8; HASH_SIZE] {
-    let lamport = &hkdf_expand(hkdf_extract("BLS-SIG-KEYGEN-SALT-".as_bytes(), ikm).as_bytes());
-
-    // TODO: don't do all this extra work with extraction.
-    let lamport_bytes = lamport
-        .iter_chunks()
-        .map(|a| a.to_vec())
-        .flatten()
-        .collect::<Vec<u8>>();
-
-    // TODO: justify 48.
-    mod_r(&lamport_bytes[0..48])
-}
-
-fn mod_r(bytes: &[u8]) -> [u8; HASH_SIZE] {
-    debug_assert_eq!(bytes.len(), HASH_SIZE);
-
-    let n = BigUint::from_bytes_be(bytes);
-    let r = BigUint::parse_bytes(R.as_bytes(), 10).expect("must be able to parse R");
-    let x = (n % r).to_bytes_be();
-
-    debug_assert!(x.len() <= HASH_SIZE);
-
-    let mut output = [0; HASH_SIZE];
-    output[HASH_SIZE - bytes.len()..].copy_from_slice(&x);
-    output
-}
-
-fn parent_sk_to_lamport_pk(ikm: &[u8], index: u32) -> [u8; HASH_SIZE] {
-    let salt = index.to_be_bytes();
-    let not_ikm = flip_bits(ikm);
-
-    let lamports = [
-        ikm_to_lamport_sk(ikm, &salt),
-        ikm_to_lamport_sk(&not_ikm, &salt),
-    ];
-
-    let mut lamport_pk = vec![0; HASH_SIZE * LAMPORT_ARRAY_SIZE as usize * 2];
-
-    lamports
-        .iter()
-        .map(LamportSecretKey::iter_chunks)
-        .flatten()
-        .enumerate()
-        .for_each(|(i, chunk)| {
-            let output_slice = lamport_pk
-                .get_mut(i * HASH_SIZE..(i + 1) * HASH_SIZE)
-                .expect("lamport_pk must have adequate capacity");
-
-            let mut hasher = Sha256::new();
-            hasher.input(chunk);
-            hasher.result(output_slice);
-        });
-
-    let mut compressed_lamport_pk = [0; HASH_SIZE];
-    let mut hasher = Sha256::new();
-    hasher.input(&lamport_pk);
-    hasher.result(&mut compressed_lamport_pk);
-
-    compressed_lamport_pk
-}
-
-fn ikm_to_lamport_sk(salt: &[u8], ikm: &[u8]) -> LamportSecretKey {
-    hkdf_expand(hkdf_extract(salt, ikm).as_bytes())
-}
-
-fn hkdf_extract(ikm: &[u8], salt: &[u8]) -> PlainText {
-    let mut hasher = Sha256::new();
-    hasher.input(salt);
-    hasher.input(ikm);
-
-    let mut digest = vec![0; HASH_SIZE];
-    hasher.result(&mut digest);
-
-    digest.into()
-}
-
-fn hkdf_expand(prk: &[u8]) -> LamportSecretKey {
-    let mut okm = LamportSecretKey::zero();
-
-    for i in 0..LAMPORT_ARRAY_SIZE {
-        let mut hasher = Sha256::new();
-
-        hasher.input(prk);
-
-        if let Some(prev) = i.checked_sub(1) {
-            hasher.input(okm.get_chunk(prev))
-        }
-
-        hasher.input(&[i + 1]);
-
-        hasher.result(okm.get_mut_chunk(i));
-    }
-
-    okm
-}
-
-fn flip_bits(input: &[u8]) -> [u8; HASH_SIZE] {
-    debug_assert_eq!(input.len(), HASH_SIZE);
-
-    let mut output = [0; HASH_SIZE];
-
-    for (i, byte) in input.iter().enumerate() {
-        output[i] = !byte
-    }
-
-    output
-}
-
-#[cfg(test)]
-mod test {
-    use super::*;
-
-    struct RawTestVector {
-        seed: &'static str,
-        master_sk: &'static str,
-        child_index: u32,
-        lamport_0: Vec<&'static str>,
-        lamport_1: Vec<&'static str>,
-        compressed_lamport_sk: &'static str,
-        child_sk: &'static str,
-    }
-
-    struct TestVector {
-        seed: Vec<u8>,
-        master_sk: Vec<u8>,
-        child_index: u32,
-        lamport_0: Vec<[u8; HASH_SIZE]>,
-        lamport_1: Vec<[u8; HASH_SIZE]>,
-        compressed_lamport_pk: Vec<u8>,
-        child_sk: Vec<u8>,
-    }
-
-    impl From<RawTestVector> for TestVector {
-        fn from(raw: RawTestVector) -> TestVector {
-            todo!()
-        }
-    }
-
-    fn get_raw_vector() -> RawTestVector {
-        RawTestVector {
-        seed: "0xc55257c360c07c72029aebc1b53c05ed0362ada38ead3e3e9efa3708e53495531f09a6987599d18264c1e1c92f2cf141630c7a3c4ab7c81b2f001698e7463b04",
-        master_sk:
-            "12513733877922233913083619867448865075222526338446857121953625441395088009793",
-        child_index: 0,
-        lamport_0: vec![
-            "0x7b4a587eac94d7f56843e718a04965d4832ef826419b4001a3ad0ba77eb44a3b",
-            "0x90f45a712112122429412921ece5c30eb2a6daf739dc9034fc79424daeb5eff6",
-            "0xd061c2799de00b2be90eb1cc295f4c31e22d4b45c59a9b9b2554379bea7783cb",
-            "0x3ad17e4cda2913b5180557fbe7db04b5ba440ce8bb035ae27878d66fbfa50d2c",
-            "0xf5b954490933ad47f8bf612d4a4f329b3aa8914b1b83d59e15e271e2a087e002",
-            "0x95d68d505bf4ff3e5149bc5499cf4b2f00686c674a29a8d903f70e569557d867",
-            "0x1b59c76d9bb2170b220a87833582ede5970d4a336d91c99a812825afe963e056",
-            "0x4310ff73cfbbf7b81c39ecbf1412da33e9388c1a95d71a75e51fe12256551ceb",
-            "0xee696343f823e5716e16747f3bbae2fc6de233fe10eea8e45b4579018da0874f",
-            "0xae12a437aaa7ae59f7d8328944b6a2b973a43565c55d5807dc2faf223a33aa73",
-            "0x2a3ae0b47f145bab629452661ff7741f111272e33ec571030d0eb222e1ed1390",
-            "0x1a3ea396e8cbd1d97733ef4753d6840b42c0795d2d693f18e6f0e7b3fff2beb2",
-            "0x472429d0643c888bfdfe6e6ccfdeee6d345d60c6710859ac29fc289fd3656347",
-            "0xa32d4d955949b8bed0eb20f586d8fd516d6ddec84fbbc36998d692633c349822",
-            "0xe5ac8ac5ee1d40e53a7abf36e8269d5d5fce450a87feae8e59f432a44bcc7666",
-            "0xddf9e497ed78032fbd72d9b8abd5204d81c3475f29afa44cdf1ded8ea72dd1dc",
-            "0x945c62e88fb1e5f3c15ff57cd5eb1586ee93ec5ec80154c5a9c50241c5adae0a",
-            "0xc8868b50fc8423c96b7efa1ede4d3203a6b835dbeb6b2ababc58397e6b31d9dd",
-            "0x66de9bd86b50e2b6a755310520af655759c1753bff34b79a5cd63d6811fc8c65",
-            "0x5b13786c6068df7735343e5591393bea8aee92ac5826d6132bf4f5ebf1098776",
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-            "0xb534cdddcf1aa1c6b4cbba46d1db31b766d958e0a0306450bc031d1e3ed79d97",
-            "0x54aa051b754c31658377f7bff00b7deaa861e74cb12e1eb84216666e19b23d69",
-            "0x0220d57f63435948818eb376367b113c188e37451c216380f65d1ad55f73f527",
-            "0xf9dd2e391565534a4db84980433bf5a56250f45fe294fce2679bcf115522c081",
-            "0x1166591ee2ca59b9f4e525900f085141be8879c66ef18529968babeb87c44814",
-            "0xf4fa2e8de39bdbeb29b64d8b440d3a6c9a6ca5bdce543877eaee93c11bd70ab8",
-            "0x07f466d73b93db283b3f7bfaf9c39ae296adc376ab307ef12312631d0926790e",
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-            "0x5c985de270e62c44f0b49157882e8e83641b906ce47959e337fe8423e125a2eb",
-            "0x4e13b11e13202439bb5de5eea3bb75d2d7bf90f91411163ade06161a9cf424db",
-            "0x583a8fa159bb74fa175d72f4e1705e9a3b8ffe26ec5ad6e720444b99288f1213",
-            "0x903d2a746a98dfe2ee2632606d57a9b0fa6d8ccd895bb18c2245fd91f8a43676",
-            "0xa35a51330316012d81ec7249e3f2b0c9d7fcbb99dd98c62fe880d0a152587f51",
-            "0x33818a7beb91730c7b359b5e23f68a27b429967ea646d1ea99c314353f644218",
-            "0x183650af1e0b67f0e7acb59f8c72cc0e60acc13896184db2a3e4613f65b70a8b",
-            "0x857ff2974bef960e520937481c2047938a718cea0b709282ed4c2b0dbe2ef8fa",
-            "0x95a367ecb9a401e98a4f66f964fb0ece783da86536410a2082c5dbb3fc865799",
-            "0x56c606a736ac8268aedadd330d2681e7c7919af0fe855f6c1c3d5c837aa92338",
-            "0x5c97f7abf30c6d0d4c23e762c026b94a6052a444df4ed942e91975419f68a3a4",
-            "0x0b571de27d2022158a3128ae44d23a8136e7dd2dee74421aa4d6ed15ee1090a0",
-            "0xa17f6bc934a2f3c33cea594fee8c96c1290feec934316ebbbd9efab4937bf9f9",
-            "0x9ff57d70f27aad7281841e76435285fd27f10dad256b3f5cabde4ddc51b70eff",
-            "0xafa3071a847215b3ccdf51954aa7cb3dd2e6e2a39800042fc42009da705508b2",
-            "0x5e3bea33e4ac6f7c50a077d19571b1796e403549b1ce7b15e09905a0cc5a4acf",
-            "0x0dc7ba994e632ab95f3ecb7848312798810cf761d1c776181882d17fd6dda075",
-            "0xb4f7158679dad9f7370a2f64fbe617a40092849d17453b4f50a93ca8c6885844",
-            "0x094564b00f53c6f27c121fd8adfe1685b258b259e585a67b57c85efb804c57b2",
-            "0x9cd21a4249ba3fccffad550cdb8409dc12d8b74a7192874b6bafe2363886f318",
-            "0xbb22e0dad55cb315c564c038686419d40ef7f13af2143a28455bf445f6e10393",
-            "0x2a71d5e00821178c2cd39e7501e07da5cca6680eb7cdbe996f52dccafadb3735",
-            "0x9619406093b121e044a5b403bb1713ae160aeb52ad441f82dc6c63e4b323b969",
-            "0x3b8bd1d82c6d67ae707e19b889f1cb1f7bba912f12ae4284298f3a70c3644c79",
-            "0xd7a70c50d47d48785b299dbea01bf03ef18b8495de3c35cb265bc8f3295c4e15",
-            "0x8802ecce8dd6b6190af8ac79aafda3479c29f548d65e5798c0ca51a529b19108",
-            "0x4b630e1df52ec5fd650f4a4e76b3eeddda39e1e9eab996f6d3f02eefdf690990",
-            "0x0bfbff60fcf7f411d469f7f6f0a58ca305fd84eb529ee3ac73c00174793d723e",
-            "0x535f78b5f3a99a1c498e2c19dc1acb0fbbaba8972ba1d7d66936c28ab3667ebe",
-            "0x06ba92d8129db98fec1b75f9489a394022854f22f2e9b9450b187a6fc0d94a86",
-            "0xb7ae275ba10f80fb618a2cf949d5ad2e3ae24eb2eb37dcf1ec8c8b148d3ba27f",
-            "0xb275579bcf2584d9794dd3fc7f999902b13d33a9095e1980d506678e9c263de1",
-            "0x843ccd52a81e33d03ad2702b4ef68f07ca0419d4495df848bff16d4965689e48",
-            "0xde8b779ca7250f0eb867d5abdffd1d28c72a5a884d794383fc93ca40e5bf6276",
-            "0x6b789a2befccb8788941c9b006e496b7f1b03dbb8e530ba339db0247a78a2850",
-            "0xfccd4dca80bc52f9418f26b0528690255e320055327a34b50caf088235d2f660",
-            "0x18479ebfbe86c1e94cd05c70cb6cace6443bd9fdac7e01e9c9535a9e85141f2f",
-            "0x5350c8f3296441db954a261238c88a3a0c51ab418a234d566985f2809e211148",
-            "0xa5636614135361d03a381ba9f6168e2fd0bd2c1105f9b4e347c414df8759dea3",
-            "0xe7bb69e600992e6bd41c88a714f50f450153f1a05d0ddb4213a3fc4ba1f48c3f",
-            "0x17b42e81bae19591e22aa2510be06803bcb5c39946c928c977d78f346d3ca86b",
-            "0x30a10c07dc9646b7cbb3e1ab722a94d2c53e04c0c19efaaea7dccba1b00f2a20",
-        ],
-        compressed_lamport_sk:
-            "0x672ba456d0257fe01910d3a799c068550e84881c8d441f8f5f833cbd6c1a9356",
-        child_sk:
-            "7419543105316279183937430842449358701327973165530407166294956473095303972104"
-        }
-    }
-}
diff --git a/crypto/eth2_keystore/Cargo.toml b/crypto/eth2_keystore/Cargo.toml
index 43573961b..31e170956 100644
--- a/crypto/eth2_keystore/Cargo.toml
+++ b/crypto/eth2_keystore/Cargo.toml
@@ -8,7 +8,11 @@ edition = "2018"
 
 [dependencies]
 rand = "0.7.2"
-rust-crypto = "0.2.36"
+aes-ctr = "0.4.0"
+hmac = "0.8.0"
+pbkdf2 = { version = "0.4.0", default-features = false }
+scrypt = { version = "0.3.0", default-features = false }
+sha2 = "0.9.0"
 uuid = { version = "0.8", features = ["serde", "v4"] }
 zeroize = { version = "1.0.0", features = ["zeroize_derive"] }
 serde = "1.0.110"
diff --git a/crypto/eth2_keystore/src/json_keystore/kdf_module.rs b/crypto/eth2_keystore/src/json_keystore/kdf_module.rs
index 1a595c45c..b8dc01fa7 100644
--- a/crypto/eth2_keystore/src/json_keystore/kdf_module.rs
+++ b/crypto/eth2_keystore/src/json_keystore/kdf_module.rs
@@ -4,9 +4,9 @@
 //! data structures. Specifically, there should not be any actual crypto logic in this file.
 
 use super::hex_bytes::HexBytes;
-use crypto::sha2::Sha256;
-use crypto::{hmac::Hmac, mac::Mac};
+use hmac::{Hmac, Mac, NewMac};
 use serde::{Deserialize, Serialize};
+use sha2::Sha256;
 use std::convert::TryFrom;
 
 /// KDF module representation.
@@ -66,7 +66,9 @@ pub enum Prf {
 impl Prf {
     pub fn mac(&self, password: &[u8]) -> impl Mac {
         match &self {
-            _hmac_sha256 => Hmac::new(Sha256::new(), password),
+            _hmac_sha256 => {
+                Hmac::<Sha256>::new_varkey(password).expect("Could not derive HMAC using SHA256.")
+            }
         }
     }
 }
diff --git a/crypto/eth2_keystore/src/keystore.rs b/crypto/eth2_keystore/src/keystore.rs
index b23751f82..da6791590 100644
--- a/crypto/eth2_keystore/src/keystore.rs
+++ b/crypto/eth2_keystore/src/keystore.rs
@@ -7,11 +7,20 @@ use crate::json_keystore::{
     Kdf, KdfModule, Scrypt, Sha256Checksum, Version,
 };
 use crate::Uuid;
+use aes_ctr::stream_cipher::generic_array::GenericArray;
+use aes_ctr::stream_cipher::{NewStreamCipher, SyncStreamCipher};
+use aes_ctr::Aes128Ctr as AesCtr;
 use bls::{Keypair, PublicKey, SecretHash, SecretKey};
-use crypto::{digest::Digest, sha2::Sha256};
 use eth2_key_derivation::PlainText;
+use hmac::Hmac;
+use pbkdf2::pbkdf2;
 use rand::prelude::*;
+use scrypt::{
+    errors::{InvalidOutputLen, InvalidParams},
+    scrypt, ScryptParams,
+};
 use serde::{Deserialize, Serialize};
+use sha2::{Digest, Sha256};
 use ssz::DecodeError;
 use std::io::{Read, Write};
 
@@ -59,6 +68,8 @@ pub enum Error {
     InvalidPbkdf2Param,
     InvalidScryptParam,
     IncorrectIvSize { expected: usize, len: usize },
+    ScryptInvalidParams(InvalidParams),
+    ScryptInvaidOutputLen(InvalidOutputLen),
 }
 
 /// Constructs a `Keystore`.
@@ -280,15 +291,13 @@ pub fn encrypt(
     let derived_key = derive_key(&password, &kdf)?;
 
     // Encrypt secret.
-    let mut cipher_text = vec![0; plain_text.len()];
+    let mut cipher_text = plain_text.to_vec();
     match &cipher {
         Cipher::Aes128Ctr(params) => {
-            crypto::aes::ctr(
-                crypto::aes::KeySize::KeySize128,
-                &derived_key.as_bytes()[0..16],
-                params.iv.as_bytes(),
-            )
-            .process(plain_text, &mut cipher_text);
+            let key = GenericArray::from_slice(&derived_key.as_bytes()[0..16]);
+            let nonce = GenericArray::from_slice(params.iv.as_bytes());
+            let mut cipher = AesCtr::new(&key, &nonce);
+            cipher.apply_keystream(&mut cipher_text);
         }
     };
 
@@ -316,21 +325,19 @@ pub fn decrypt(password: &[u8], crypto: &Crypto) -> Result<PlainText, Error> {
         return Err(Error::InvalidPassword);
     }
 
-    let mut plain_text = PlainText::zero(cipher_message.len());
+    let mut plain_text = PlainText::from(cipher_message.as_bytes().to_vec());
     match &crypto.cipher.params {
         Cipher::Aes128Ctr(params) => {
-            crypto::aes::ctr(
-                crypto::aes::KeySize::KeySize128,
-                &derived_key.as_bytes()[0..16],
-                // NOTE: we do not check the size of the `iv` as there is no guidance about
-                // this on EIP-2335.
-                //
-                // Reference:
-                //
-                // - https://github.com/ethereum/EIPs/issues/2339#issuecomment-623865023
-                params.iv.as_bytes(),
-            )
-            .process(cipher_message.as_bytes(), plain_text.as_mut_bytes());
+            let key = GenericArray::from_slice(&derived_key.as_bytes()[0..16]);
+            // NOTE: we do not check the size of the `iv` as there is no guidance about
+            // this on EIP-2335.
+            //
+            // Reference:
+            //
+            // - https://github.com/ethereum/EIPs/issues/2339#issuecomment-623865023
+            let nonce = GenericArray::from_slice(params.iv.as_bytes());
+            let mut cipher = AesCtr::new(&key, &nonce);
+            cipher.apply_keystream(plain_text.as_mut_bytes());
         }
     };
     Ok(plain_text)
@@ -340,11 +347,11 @@ pub fn decrypt(password: &[u8], crypto: &Crypto) -> Result<PlainText, Error> {
 /// `cipher_message`.
 fn generate_checksum(derived_key: &DerivedKey, cipher_message: &[u8]) -> [u8; HASH_SIZE] {
     let mut hasher = Sha256::new();
-    hasher.input(&derived_key.as_bytes()[16..32]);
-    hasher.input(cipher_message);
+    hasher.update(&derived_key.as_bytes()[16..32]);
+    hasher.update(cipher_message);
 
     let mut digest = [0; HASH_SIZE];
-    hasher.result(&mut digest);
+    digest.copy_from_slice(&hasher.finalize());
     digest
 }
 
@@ -354,8 +361,6 @@ fn derive_key(password: &[u8], kdf: &Kdf) -> Result<DerivedKey, Error> {
 
     match &kdf {
         Kdf::Pbkdf2(params) => {
-            let mut mac = params.prf.mac(password);
-
             // RFC2898 declares that `c` must be a "positive integer" and the `crypto` crate panics
             // if it is `0`.
             //
@@ -371,8 +376,8 @@ fn derive_key(password: &[u8], kdf: &Kdf) -> Result<DerivedKey, Error> {
                 return Err(Error::InvalidPbkdf2Param);
             }
 
-            crypto::pbkdf2::pbkdf2(
-                &mut mac,
+            pbkdf2::<Hmac<Sha256>>(
+                password,
                 params.salt.as_bytes(),
                 params.c,
                 dk.as_mut_bytes(),
@@ -400,12 +405,14 @@ fn derive_key(password: &[u8], kdf: &Kdf) -> Result<DerivedKey, Error> {
                 return Err(Error::InvalidScryptParam);
             }
 
-            crypto::scrypt::scrypt(
+            scrypt(
                 password,
                 params.salt.as_bytes(),
-                &crypto::scrypt::ScryptParams::new(log2_int(params.n) as u8, params.r, params.p),
+                &ScryptParams::new(log2_int(params.n) as u8, params.r, params.p)
+                    .map_err(|e| Error::ScryptInvalidParams(e))?,
                 dk.as_mut_bytes(),
-            );
+            )
+            .map_err(|e| Error::ScryptInvaidOutputLen(e))?;
         }
     }