diff --git a/eth_keys.nimble b/eth_keys.nimble
index b19bb9d..d1e0670 100644
--- a/eth_keys.nimble
+++ b/eth_keys.nimble
@@ -7,7 +7,7 @@ srcDir        = "src"
 
 ### Dependencies
 
-requires "nim >= 0.18.0", "keccak_tiny >= 0.1.0", "ttmath >= 0.1.0", "nimSHA2", "secp256k1"
+requires "nim >= 0.18.0", "nimcrypto", "ttmath >= 0.1.0", "nimSHA2", "secp256k1"
 
 proc test(name: string, lang: string = "c") =
   if not dirExists "build":
diff --git a/src/backend_libsecp256k1/libsecp256k1.nim b/src/backend_libsecp256k1/libsecp256k1.nim
index 03b30ba..e981926 100644
--- a/src/backend_libsecp256k1/libsecp256k1.nim
+++ b/src/backend_libsecp256k1/libsecp256k1.nim
@@ -8,7 +8,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 import ../datatypes, ../private/conversion_bytes
-import secp256k1, keccak_tiny
+import secp256k1, nimcrypto
 
 const SECP256K1_CONTEXT_ALL = SECP256K1_CONTEXT_VERIFY or SECP256K1_CONTEXT_SIGN
 
@@ -31,7 +31,7 @@ proc asPtrCuchar(key: PrivateKey): ptr cuchar =
 proc asPtrCuchar(key: Serialized_PubKey): ptr cuchar =
   cast[ptr cuchar](unsafeAddr key)
 
-proc asPtrCuchar(msg_hash: Hash[256]): ptr cuchar =
+proc asPtrCuchar(msg_hash: MDigest[256]): ptr cuchar =
   cast[ptr cuchar](unsafeAddr msg_hash)
 
 proc asPtrRecoverableSignature(sig: Signature): ptr secp256k1_ecdsa_recoverable_signature =
@@ -120,7 +120,7 @@ proc parsePublicKey*(data: openarray[byte]): PublicKey =
   else: # TODO: Support other lengths
     raise newException(Exception, "Wrong public key length")
 
-proc ecdsa_sign*(key: PrivateKey, msg_hash: Hash[256]): Signature {.noInit.}=
+proc ecdsa_sign*(key: PrivateKey, msg_hash: MDigest[256]): Signature {.noInit.}=
   ## Sign a message with a recoverable signature
   ## Input:
   ##   - A message encoded with keccak_256
@@ -139,7 +139,7 @@ proc ecdsa_sign*(key: PrivateKey, msg_hash: Hash[256]): Signature {.noInit.}=
   if not success:
     raise newException(ValueError, "The nonce generation function failed, or the private key was invalid.")
 
-proc ecdsa_recover*(msg_hash: Hash[256], sig: Signature): PublicKey =
+proc ecdsa_recover*(msg_hash: MDigest[256], sig: Signature): PublicKey =
   ## Recover the Public Key from the message hash and the signature
 
   let success: bool = bool secp256k1_ecdsa_recover(
diff --git a/src/backend_native/ecdsa.nim b/src/backend_native/ecdsa.nim
index 2d128fd..842ff24 100644
--- a/src/backend_native/ecdsa.nim
+++ b/src/backend_native/ecdsa.nim
@@ -10,8 +10,8 @@
 import  ../datatypes, ../private/[array_utils, lowlevel_types],
         ./jacobian, ./mod_arithmetic, ./hmac, ./constants
 
-import  ttmath, keccak_tiny, strutils,
-        nimSHA2 # TODO: For SHA-256, use OpenSSL instead? (see https://rosettacode.org/wiki/SHA-256#Nim)
+import  ttmath, nimcrypto, strutils,
+        nimSHA2 # TODO: For SHA-256, use nimcrypto instead? (see https://github.com/cheatfate/nimcrypto/blob/master/tests/testhmac.nim)
 
 
 proc decode_public_key(pubKey: ByteArrayBE[64]
@@ -46,7 +46,7 @@ proc private_key_to_public_key*(key: PrivateKey): PublicKey {.noInit.}=
 
   result.raw_key = encode_raw_public_key fast_multiply(SECPK1_G, keyInt)
 
-proc ecdsa_raw_verify*(msg_hash: Hash[256], vrs: Signature, key: PublicKey): bool =
+proc ecdsa_raw_verify*(msg_hash: MDigest[256], vrs: Signature, key: PublicKey): bool =
   let
     w = invmod(vrs.s, SECPK1_N)
     z = readUint256BE cast[ByteArrayBE[32]](msg_hash)
@@ -59,7 +59,7 @@ proc ecdsa_raw_verify*(msg_hash: Hash[256], vrs: Signature, key: PublicKey): boo
           )
   result = vrs.r == xy[0] and vrs.r.isOdd and vrs.s.isOdd
 
-proc deterministic_generate_k(msg_hash: Hash[256], key: PrivateKey): UInt256 =
+proc deterministic_generate_k(msg_hash: MDigest[256], key: PrivateKey): UInt256 =
   const
     v_0 = initArray[32, byte](0x01'u8)
     k_0 = initArray[32, byte](0x00'u8)
@@ -75,7 +75,7 @@ proc deterministic_generate_k(msg_hash: Hash[256], key: PrivateKey): UInt256 =
 
   result = readUint256BE cast[ByteArrayBE[32]](kb)
 
-proc ecdsa_sign*(key: PrivateKey, msg_hash: Hash[256]): Signature {.noInit.} =
+proc ecdsa_sign*(key: PrivateKey, msg_hash: MDigest[256]): Signature {.noInit.} =
   modulo(SECPK1_N):
     let
       z = readUint256BE cast[ByteArrayBE[32]](msg_hash)
@@ -92,7 +92,7 @@ proc ecdsa_sign*(key: PrivateKey, msg_hash: Hash[256]): Signature {.noInit.} =
               else: SECPK1_N - s_raw
   result.r = ry[0]
 
-proc ecdsa_recover*(msg_hash: Hash[256], vrs: Signature): PublicKey {.noInit.} =
+proc ecdsa_recover*(msg_hash: MDigest[256], vrs: Signature): PublicKey {.noInit.} =
   modulo(SECPK1_P):
     let
       x = vrs.r
diff --git a/src/backend_native/hmac.nim b/src/backend_native/hmac.nim
index 06d92a2..03a8c38 100644
--- a/src/backend_native/hmac.nim
+++ b/src/backend_native/hmac.nim
@@ -14,7 +14,7 @@
 # TODO: this is a duplicate of https://github.com/status-im/nim-eth-keys/blob/master/src/backend_native/hmac.nim
 # It should be replaced by a common crypto library in the future like https://github.com/cheatfate/nimcrypto
 
-import nimSHA2 # TODO: For SHA-256, use OpenSSL instead? (see https://rosettacode.org/wiki/SHA-256#Nim)
+import nimSHA2 # TODO: For SHA-256, use nimcrypto instead? (see https://github.com/cheatfate/nimcrypto/blob/master/tests/testhmac.nim)
 
 proc hmac_sha256*[N: static[int]](key: array[N, byte|char],
                                   data: string|seq[byte|char]): SHA256Digest =
diff --git a/src/datatypes_interface.nim b/src/datatypes_interface.nim
index 4c9e2ca..d2392ec 100644
--- a/src/datatypes_interface.nim
+++ b/src/datatypes_interface.nim
@@ -15,7 +15,7 @@
 
 import  ./datatypes, ./private/conversion_bytes
 
-import keccak_tiny
+import nimcrypto
 
 when defined(backend_native):
   import ./backend_native/ecdsa
@@ -43,28 +43,32 @@ proc initPublicKey*(hexString: string): PublicKey {.noInit.} =
 # ################################
 # Public key/signature interface
 
-proc recover_pubkey_from_msg*(message_hash: Hash[256], sig: Signature): PublicKey {.inline.} =
+proc recover_pubkey_from_msg*(message_hash: MDigest[256], sig: Signature): PublicKey {.inline.} =
   ecdsa_recover(message_hash, sig)
 
 proc recover_pubkey_from_msg*(message: string, sig: Signature): PublicKey {.inline.} =
-  let message_hash = keccak_256(message)
+  let message_hash = keccak256.digest(message)
   ecdsa_recover(message_hash, sig)
 
-proc verify_msg*(key: PublicKey, message_hash: Hash[256], sig: Signature): bool {.inline.} =
+proc verify_msg*(key: PublicKey, message_hash: MDigest[256], sig: Signature): bool {.inline.} =
   key == ecdsa_recover(message_hash, sig)
 
 proc verify_msg*(key: PublicKey, message: string, sig: Signature): bool {.inline.} =
-  let message_hash = keccak_256(message)
+  let message_hash = keccak256.digest(message)
   key == ecdsa_recover(message_hash, sig)
 
 # # ################################
 # # Private key interface
 
-proc sign_msg*(key: PrivateKey, message: string): Signature {.inline.} =
-  let message_hash = keccak_256(message)
+proc sign_msg*(key: PrivateKey, message: openarray[byte]): Signature {.inline.} =
+  let message_hash = keccak256.digest(message)
   ecdsa_sign(key, message_hash)
 
-proc sign_msg*(key: PrivateKey, message_hash: Hash[256]): Signature {.inline.} =
+proc sign_msg*(key: PrivateKey, message: string): Signature {.inline.} =
+  let message_hash = keccak256.digest(message)
+  ecdsa_sign(key, message_hash)
+
+proc sign_msg*(key: PrivateKey, message_hash: MDigest[256]): Signature {.inline.} =
   ecdsa_sign(key, message_hash)
 
 proc `$`*(key: PrivateKey): string {.inline.} =
diff --git a/tests/config.nim b/tests/config.nim
index 9bce828..a60e58f 100644
--- a/tests/config.nim
+++ b/tests/config.nim
@@ -29,7 +29,7 @@
 #     assert crypto.ecdsa_recover(msghash, sig) == pubkey
 # """
 
-import keccak_tiny
+import nimcrypto
 
 type
   testKeySig* = object
@@ -40,7 +40,7 @@ type
 
 let
   MSG* = "message"
-  MSGHASH* = keccak256(MSG)
+  MSGHASH* = keccak256.digest(MSG)
 
 # Conversion done through https://www.mobilefish.com/services/big_number/big_number.php