diff --git a/libp2p.nimble b/libp2p.nimble
index 468a1f2..ad83c06 100644
--- a/libp2p.nimble
+++ b/libp2p.nimble
@@ -19,4 +19,5 @@ task test, "Runs the test suite":
   exec "nim c -r tests/testmultihash"
   exec "nim c -r tests/testmultibase"
   exec "nim c -r tests/testcid"
+  exec "nim c -r tests/testecnist"
   exec "nim c -r tests/testdaemon"
diff --git a/libp2p/crypto/common.nim b/libp2p/crypto/common.nim
index 1452122..4b4c627 100644
--- a/libp2p/crypto/common.nim
+++ b/libp2p/crypto/common.nim
@@ -1,9 +1,16 @@
+## Nim-Libp2p
+## Copyright (c) 2018 Status Research & Development GmbH
+## Licensed under either of
+##  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
+##  * MIT license ([LICENSE-MIT](LICENSE-MIT))
+## at your option.
+## This file may not be copied, modified, or distributed except according to
+## those terms.
+
+## This module implements interface with BearSSL library sources.
 import strutils
 from os import DirSep
 
-when defined(vcc):
-  {.passC: "/Zi /FS".}
-
 const
   bearPath = currentSourcePath.rsplit(DirSep, 1)[0] & DirSep &
              "BearSSL" & DirSep
@@ -625,6 +632,16 @@ proc brEcdsaVerifyRaw*(impl: ptr BrEcImplementation, hash: pointer,
                        siglen: int): uint32 {.
      cdecl, importc: "br_ecdsa_i31_vrfy_raw", header: "bearssl_ec.h".}
 
+proc brEcdsaSignAsn1*(impl: ptr BrEcImplementation, hf: ptr BrHashClass,
+                     value: pointer, sk: ptr BrEcPrivateKey,
+                     sig: pointer): int {.
+     cdecl, importc: "br_ecdsa_i31_sign_asn1", header: "bearssl_ec.h".}
+
+proc brEcdsaVerifyAsn1*(impl: ptr BrEcImplementation, hash: pointer,
+                        hashlen: int, pk: ptr BrEcPublicKey, sig: pointer,
+                        siglen: int): uint32 {.
+     cdecl, importc: "br_ecdsa_i31_vrfy_asn1", header: "bearssl_ec.h".}
+
 proc brAsn1UintPrepare*(xdata: pointer, xlen: int): BrAsn1Uint {.
      cdecl, importc: "br_asn1_uint_prepare", header: "inner.h".}
 
diff --git a/libp2p/crypto/ecnist.nim b/libp2p/crypto/ecnist.nim
index 0f94117..8868e1c 100644
--- a/libp2p/crypto/ecnist.nim
+++ b/libp2p/crypto/ecnist.nim
@@ -6,9 +6,13 @@
 ## at your option.
 ## This file may not be copied, modified, or distributed except according to
 ## those terms.
+
+## This module implements ECDSA and ECDHE for NIST elliptic curves
+## secp256r1, secp384r1 and secp521r1.
 import common
 import nimcrypto/utils
 import minasn1
+export minasn1.Asn1Status
 
 const
   PubKey256Length* = 65
@@ -36,7 +40,6 @@ type
 
   EcSignature* = ref object
     buffer*: seq[byte]
-    curve*: cint
 
   EcCurveKind* = enum
     Secp256r1 = BR_EC_SECP256R1,
@@ -121,15 +124,6 @@ proc getOffset(seckey: EcPrivateKey): int {.inline.} =
   else:
     result = cast[int](o)
 
-template getSignatureLength*(curve: EcCurveKind): int =
-  case curve
-  of Secp256r1:
-    Sig256Length
-  of Secp384r1:
-    Sig384Length
-  of Secp521r1:
-    Sig521Length
-
 template getPublicKeyLength*(curve: EcCurveKind): int =
   case curve
   of Secp256r1:
@@ -139,15 +133,6 @@ template getPublicKeyLength*(curve: EcCurveKind): int =
   of Secp521r1:
     PubKey521Length
 
-template getPrivateKeyLength*(curve: EcCurveKind): int =
-  case curve
-  of Secp256r1:
-    SecKey256Length
-  of Secp384r1:
-    SecKey384Length
-  of Secp521r1:
-    SecKey521Length
-
 proc copy*[T: EcPKI](dst: var T, src: T): bool =
   ## Copy EC private key, public key or scalar ``src`` to ``dst``.
   ##
@@ -288,13 +273,7 @@ proc `$`*(pubkey: EcPublicKey): string =
 
 proc `$`*(sig: EcSignature): string =
   ## Return hexadecimal string representation of EC signature.
-  if sig.curve == 0 or len(sig.buffer) == 0:
-    result = "Empty signature"
-  else:
-    if sig.curve notin EcSupportedCurvesCint:
-      result = "Unknown signature"
-    else:
-      result = toHex(sig.buffer)
+  result = toHex(sig.buffer)
 
 proc toBytes*(seckey: EcPrivateKey, data: var openarray[byte]): int =
   ## Serialize EC private key ``seckey`` to ASN.1 DER binary form and store it
@@ -332,8 +311,8 @@ proc toBytes*(seckey: EcPrivateKey, data: var openarray[byte]): int =
     b.write(p)
     b.finish()
     result = len(b)
-    if len(data) >= len(b):
-      copyMem(addr data[0], addr b.buffer[0], len(b))
+    if len(data) >= result:
+      copyMem(addr data[0], addr b.buffer[0], result)
 
 proc toBytes*(pubkey: EcPublicKey, data: var openarray[byte]): int =
   ## Serialize EC public key ``pubkey`` to ASN.1 DER binary form and store it
@@ -362,8 +341,18 @@ proc toBytes*(pubkey: EcPublicKey, data: var openarray[byte]): int =
     b.write(p)
     b.finish()
     result = len(b)
-    if len(data) >= len(b):
-      copyMem(addr data[0], addr b.buffer[0], len(b))
+    if len(data) >= result:
+      copyMem(addr data[0], addr b.buffer[0], result)
+
+proc toBytes*(sig: EcSignature, data: var openarray[byte]): int =
+  ## Serialize EC signature ``sig`` to ASN.1 DER binary form and store it
+  ## to ``data``.
+  ##
+  ## Procedure returns number of bytes (octets) needed to store EC signature,
+  ## or `0` if signature is not in supported curve.
+  result = len(sig.buffer)
+  if len(data) >= result:
+    copyMem(addr data[0], unsafeAddr sig.buffer[0], result)
 
 proc getBytes*(seckey: EcPrivateKey): seq[byte] =
   ## Serialize EC private key ``seckey`` to ASN.1 DER binary form and return it.
@@ -385,6 +374,13 @@ proc getBytes*(pubkey: EcPublicKey): seq[byte] =
   else:
     raise newException(EcKeyIncorrectError, "Incorrect public key")
 
+proc getBytes*(sig: EcSignature): seq[byte] =
+  ## Serialize EC signature ``sig`` to ASN.1 DER binary form and return it.
+  result = newSeq[byte]()
+  let length = sig.toBytes(result)
+  result.setLen(length)
+  discard sig.toBytes(result)
+
 proc `==`*(pubkey1, pubkey2: EcPublicKey): bool =
   ## Returns ``true`` if both keys ``pubkey1`` and ``pubkey2`` are equal.
   if pubkey1.key.curve != pubkey2.key.curve:
@@ -413,8 +409,6 @@ proc `==`*(seckey1, seckey2: EcPrivateKey): bool =
 
 proc `==`*(sig1, sig2: EcSignature): bool =
   ## Return ``true`` if both signatures ``sig1`` and ``sig2`` are equal.
-  if sig1.curve != sig2.curve:
-    return false
   result = (sig1.buffer == sig2.buffer)
 
 proc init*(key: var EcPrivateKey, data: openarray[byte]): Asn1Status =
@@ -539,35 +533,21 @@ proc init*(pubkey: var EcPublicKey, data: openarray[byte]): Asn1Status =
   else:
     result = Asn1Status.Incorrect
 
-proc init*(sig: var EcSignature, data: openarray[byte]): bool =
+proc init*(sig: var EcSignature, data: openarray[byte]): Asn1Status =
   ## Initialize EC signature ``sig`` from raw binary representation ``data``.
   ##
-  ## Length of ``data`` array must be ``Sig256Length``, ``Sig384Length``
-  ## or ``Sig521Length``.
-  ##
-  ## Procedure returns ``true`` on success, ``false`` otherwise.
-  var curve: cint
+  ## Procedure returns ``Asn1Status``.
+  result = Asn1Status.Incorrect
   if len(data) > 0:
-    if len(data) == Sig256Length:
-      curve = cast[cint](Secp256r1)
-      result = true
-    elif len(data) == Sig384Length:
-      curve = cast[cint](Secp384r1)
-      result = true
-    elif len(data) == Sig521Length:
-      curve = cast[cint](Secp521r1)
-      result = true
-  if result:
     sig = new EcSignature
-    sig.curve = curve
     sig.buffer = @data
-    result = true
+    result = Asn1Status.Success
 
-proc init*[T: EcPKI](sospk: var T, data: string): bool {.inline.} =
+proc init*[T: EcPKI](sospk: var T, data: string): Asn1Status {.inline.} =
   ## Initialize EC `private key`, `public key` or `scalar` ``sospk`` from
   ## hexadecimal string representation ``data``.
   ##
-  ## Procedure returns ``true`` on success, ``false`` otherwise.
+  ## Procedure returns ``Asn1Status``.
   result = sospk.init(fromHex(data))
 
 proc init*(t: typedesc[EcPrivateKey], data: openarray[byte]): EcPrivateKey =
@@ -589,8 +569,10 @@ proc init*(t: typedesc[EcPublicKey], data: openarray[byte]): EcPublicKey =
 proc init*(t: typedesc[EcSignature], data: openarray[byte]): EcSignature =
   ## Initialize EC signature from raw binary representation ``data`` and
   ## return constructed object.
-  if not result.init(data):
-    raise newException(EcKeyIncorrectError, "Incorrect signature")
+  let res = result.init(data)
+  if res != Asn1Status.Success:
+    raise newException(EcKeyIncorrectError,
+                       "Incorrect signature (" & $res & ")")
 
 proc init*[T: EcPKI](t: typedesc[T], data: string): T {.inline.} =
   ## Initialize EC `private key`, `public key` or `scalar` from hexadecimal
@@ -620,30 +602,30 @@ proc scalarMul*(pub: EcPublicKey, sec: EcPrivateKey): EcPublicKey =
 
 proc sign*[T: byte|char](seckey: EcPrivateKey,
                          message: openarray[T]): EcSignature =
-  ## Get ECDSA signature of data ``message`` using private key ``seckey``.
+  ## Get ECDSA signature of data ``message`` using private key ``seckey`` and.
   var hc: BrHashCompatContext
   var hash: array[32, byte]
   var impl = brEcGetDefault()
-  if len(message) > 0:
-    if seckey.key.curve in EcSupportedCurvesCint:
-      let length = getSignatureLength(cast[EcCurveKind](seckey.key.curve))
-      result = new EcSignature
-      result.curve = seckey.key.curve
-      result.buffer = newSeq[byte](length)
-      var kv = addr sha256Vtable
-      kv.init(addr hc.vtable)
+  if seckey.key.curve in EcSupportedCurvesCint:
+    result = new EcSignature
+    result.buffer = newSeq[byte](256)
+    var kv = addr sha256Vtable
+    kv.init(addr hc.vtable)
+    if len(message) > 0:
       kv.update(addr hc.vtable, unsafeAddr message[0], len(message))
-      kv.output(addr hc.vtable, addr hash[0])
-      let res = brEcdsaSignRaw(impl, kv, addr hash[0], addr seckey.key,
-                               addr result.buffer[0])
-      if res != getSignatureLength(cast[EcCurveKind](result.curve)):
-        raise newException(EcSignatureError, "Could not make signature")
-      # Clear context with initial value
-      kv.init(addr hc.vtable)
     else:
-      raise newException(EcKeyIncorrectError, "Incorrect private key")
+      kv.update(addr hc.vtable, nil, 0)
+    kv.output(addr hc.vtable, addr hash[0])
+    let res = brEcdsaSignAsn1(impl, kv, addr hash[0], addr seckey.key,
+                              addr result.buffer[0])
+    # Clear context with initial value
+    kv.init(addr hc.vtable)
+    if res != 0:
+      result.buffer.setLen(res)
+    else:
+      raise newException(EcSignatureError, "Could not make signature")
   else:
-    raise newException(EcSignatureError, "Empty message")
+    raise newException(EcKeyIncorrectError, "Incorrect private key")
 
 proc verify*[T: byte|char](sig: EcSignature, message: openarray[T],
                            pubkey: EcPublicKey): bool {.inline.} =
@@ -655,32 +637,17 @@ proc verify*[T: byte|char](sig: EcSignature, message: openarray[T],
   var hc: BrHashCompatContext
   var hash: array[32, byte]
   var impl = brEcGetDefault()
-  if len(message) > 0:
-    if pubkey.key.curve in EcSupportedCurvesCint and
-       pubkey.key.curve == sig.curve:
-      var kv = addr sha256Vtable
-      kv.init(addr hc.vtable)
+  if pubkey.key.curve in EcSupportedCurvesCint:
+    var kv = addr sha256Vtable
+    kv.init(addr hc.vtable)
+    if len(message) > 0:
       kv.update(addr hc.vtable, unsafeAddr message[0], len(message))
-      kv.output(addr hc.vtable, addr hash[0])
-      let res = brEcdsaVerifyRaw(impl, addr hash[0], 32, unsafeAddr pubkey.key,
-                                 addr sig.buffer[0], len(sig.buffer))
-      # Clear context with initial value
-      kv.init(addr hc.vtable)
-      result = (res == 1)
-
-when isMainModule:
-  var buffer = newSeq[byte]()
-  var kp = EcKeyPair.random(Secp256r1)
-  var length: int
-
-  var serializedSK = kp.seckey.getBytes()
-  var serializedPK = kp.pubkey.getBytes()
-  echo toHex(serializedPK)
-  echo toHex(serializedSK)
-
-  var kp2 = EcPrivateKey.init(serializedSK)
-  echo toHex(kp2.getBytes())
-
-  var pk2 = EcPublicKey.init(serializedPK)
-  echo repr pk2
-  echo toHex(pk2.getBytes())
+    else:
+      kv.update(addr hc.vtable, nil, 0)
+    kv.output(addr hc.vtable, addr hash[0])
+    let res = brEcdsaVerifyAsn1(impl, addr hash[0], len(hash),
+                                unsafeAddr pubkey.key,
+                                addr sig.buffer[0], len(sig.buffer))
+    # Clear context with initial value
+    kv.init(addr hc.vtable)
+    result = (res == 1)
diff --git a/tests/testecnist.nim b/tests/testecnist.nim
new file mode 100644
index 0000000..6735bf1
--- /dev/null
+++ b/tests/testecnist.nim
@@ -0,0 +1,499 @@
+## Nim-Libp2p
+## Copyright (c) 2018 Status Research & Development GmbH
+## Licensed under either of
+##  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
+##  * MIT license ([LICENSE-MIT](LICENSE-MIT))
+## at your option.
+## This file may not be copied, modified, or distributed except according to
+## those terms.
+import unittest
+import nimcrypto/utils
+import ../libp2p/crypto/ecnist
+
+const
+  TestsCount = 10 # number of random tests
+
+  # Test vectors obtained from BearSSL test vectors (test_crypto.c) by
+  # conversion of raw values to ASN.1 DER binary encoded form.
+  SignatureSecKeys = [
+    """30770201010420C9AFA9D845BA75166B5C215767B1D6934E50C3DB36E89B127B
+       8A622B120F6721A00A06082A8648CE3D030107A1440342000460FED4BA255A9D
+       31C961EB74C6356D68C049B8923B61FA6CE669622E60F29FB67903FE1008B8BC
+       99A41AE9E95628BC64F2F1B20C2D7E9F5177A3C294D4462299""",
+    """30770201010420C9AFA9D845BA75166B5C215767B1D6934E50C3DB36E89B127B
+       8A622B120F6721A00A06082A8648CE3D030107A1440342000460FED4BA255A9D
+       31C961EB74C6356D68C049B8923B61FA6CE669622E60F29FB67903FE1008B8BC
+       99A41AE9E95628BC64F2F1B20C2D7E9F5177A3C294D4462299""",
+    """3081A402010104306B9D3DAD2E1B8C1C05B19875B6659F4DE23C3B667BF297BA
+       9AA47740787137D896D5724E4C70A825F872C9EA60D2EDF5A00706052B810400
+       22A16403620004EC3A4E415B4E19A4568618029F427FA5DA9A8BC4AE92E02E06
+       AAE5286B300C64DEF8F0EA9055866064A254515480BC138015D9B72D7D57244E
+       A8EF9AC0C621896708A59367F9DFB9F54CA84B3F1C9DB1288B231C3AE0D4FE73
+       44FD2533264720""",
+    """3081A402010104306B9D3DAD2E1B8C1C05B19875B6659F4DE23C3B667BF297BA
+       9AA47740787137D896D5724E4C70A825F872C9EA60D2EDF5A00706052B810400
+       22A16403620004EC3A4E415B4E19A4568618029F427FA5DA9A8BC4AE92E02E06
+       AAE5286B300C64DEF8F0EA9055866064A254515480BC138015D9B72D7D57244E
+       A8EF9AC0C621896708A59367F9DFB9F54CA84B3F1C9DB1288B231C3AE0D4FE73
+       44FD2533264720""",
+    """3081DC020101044200FAD06DAA62BA3B25D2FB40133DA757205DE67F5BB0018F
+       EE8C86E1B68C7E75CAA896EB32F1F47C70855836A6D16FCC1466F6D8FBEC67DB
+       89EC0C08B0E996B83538A00706052B81040023A18189038186000401894550D0
+       785932E00EAA23B694F213F8C3121F86DC97A04E5A7167DB4E5BCD371123D46E
+       45DB6B5D5370A7F20FB633155D38FFA16D2BD761DCAC474B9A2F5023A4004931
+       01C962CD4D2FDDF782285E64584139C2F91B47F87FF82354D6630F746A28A0DB
+       25741B5B34A828008B22ACC23F924FAAFBD4D33F81EA66956DFEAA2BFDFCF5""",
+    """3081DC020101044200FAD06DAA62BA3B25D2FB40133DA757205DE67F5BB0018F
+       EE8C86E1B68C7E75CAA896EB32F1F47C70855836A6D16FCC1466F6D8FBEC67DB
+       89EC0C08B0E996B83538A00706052B81040023A18189038186000401894550D0
+       785932E00EAA23B694F213F8C3121F86DC97A04E5A7167DB4E5BCD371123D46E
+       45DB6B5D5370A7F20FB633155D38FFA16D2BD761DCAC474B9A2F5023A4004931
+       01C962CD4D2FDDF782285E64584139C2F91B47F87FF82354D6630F746A28A0DB
+       25741B5B34A828008B22ACC23F924FAAFBD4D33F81EA66956DFEAA2BFDFCF5"""
+  ]
+
+  SignaturePubKeys = [
+    """3059301306072A8648CE3D020106082A8648CE3D0301070342000460FED4BA25
+       5A9D31C961EB74C6356D68C049B8923B61FA6CE669622E60F29FB67903FE1008
+       B8BC99A41AE9E95628BC64F2F1B20C2D7E9F5177A3C294D4462299""",
+    """3059301306072A8648CE3D020106082A8648CE3D0301070342000460FED4BA25
+       5A9D31C961EB74C6356D68C049B8923B61FA6CE669622E60F29FB67903FE1008
+       B8BC99A41AE9E95628BC64F2F1B20C2D7E9F5177A3C294D4462299""",
+    """3076301006072A8648CE3D020106052B8104002203620004EC3A4E415B4E19A4
+       568618029F427FA5DA9A8BC4AE92E02E06AAE5286B300C64DEF8F0EA90558660
+       64A254515480BC138015D9B72D7D57244EA8EF9AC0C621896708A59367F9DFB9
+       F54CA84B3F1C9DB1288B231C3AE0D4FE7344FD2533264720""",
+    """3076301006072A8648CE3D020106052B8104002203620004EC3A4E415B4E19A4
+       568618029F427FA5DA9A8BC4AE92E02E06AAE5286B300C64DEF8F0EA90558660
+       64A254515480BC138015D9B72D7D57244EA8EF9AC0C621896708A59367F9DFB9
+       F54CA84B3F1C9DB1288B231C3AE0D4FE7344FD2533264720""",
+    """30819B301006072A8648CE3D020106052B81040023038186000401894550D078
+       5932E00EAA23B694F213F8C3121F86DC97A04E5A7167DB4E5BCD371123D46E45
+       DB6B5D5370A7F20FB633155D38FFA16D2BD761DCAC474B9A2F5023A400493101
+       C962CD4D2FDDF782285E64584139C2F91B47F87FF82354D6630F746A28A0DB25
+       741B5B34A828008B22ACC23F924FAAFBD4D33F81EA66956DFEAA2BFDFCF5""",
+    """30819B301006072A8648CE3D020106052B81040023038186000401894550D078
+       5932E00EAA23B694F213F8C3121F86DC97A04E5A7167DB4E5BCD371123D46E45
+       DB6B5D5370A7F20FB633155D38FFA16D2BD761DCAC474B9A2F5023A400493101
+       C962CD4D2FDDF782285E64584139C2F91B47F87FF82354D6630F746A28A0DB25
+       741B5B34A828008B22ACC23F924FAAFBD4D33F81EA66956DFEAA2BFDFCF5"""
+  ]
+
+  SignatureMessages = [
+    "sample", "test", "sample", "test", "sample", "test"
+  ]
+
+  SignatureVectors = [
+    """3046022100EFD48B2AACB6A8FD1140DD9CD45E81D69D2C877B56AAF991C34D0E
+       A84EAF3716022100F7CB1C942D657C41D436C7A1B6E29F65F3E900DBB9AFF406
+       4DC4AB2F843ACDA8""",
+    """3045022100F1ABB023518351CD71D881567B1EA663ED3EFCF6C5132B354F28D3
+       B0B7D383670220019F4113742A2B14BD25926B49C649155F267E60D3814B4C0C
+       C84250E46F0083""",
+    """3065023021B13D1E013C7FA1392D03C5F99AF8B30C570C6F98D4EA8E354B63A2
+       1D3DAA33BDE1E888E63355D92FA2B3C36D8FB2CD023100F3AA443FB107745BF4
+       BD77CB3891674632068A10CA67E3D45DB2266FA7D1FEEBEFDC63ECCD1AC42EC0
+       CB8668A4FA0AB0""",
+    """306402306D6DEFAC9AB64DABAFE36C6BF510352A4CC27001263638E5B16D9BB5
+       1D451559F918EEDAF2293BE5B475CC8F0188636B02302D46F3BECBCC523D5F1A
+       1256BF0C9B024D879BA9E838144C8BA6BAEB4B53B47D51AB373F9845C0514EEF
+       B14024787265""",
+    """308187024201511BB4D675114FE266FC4372B87682BAECC01D3CC62CF2303C92
+       B3526012659D16876E25C7C1E57648F23B73564D67F61C6F14D527D549728104
+       21E7D87589E1A702414A171143A83163D6DF460AAF61522695F207A58B95C064
+       4D87E52AA1A347916E4F7A72930B1BC06DBE22CE3F58264AFD23704CBB63B29B
+       931F7DE6C9D949A7ECFC""",
+    """30818702410E871C4A14F993C6C7369501900C4BC1E9C7B0B4BA44E04868B30B
+       41D8071042EB28C4C250411D0CE08CD197E4188EA4876F279F90B3D8D74A3C76
+       E6F1E4656AA8024200CD52DBAA33B063C3A6CD8058A1FB0A46A4754B034FCC64
+       4766CA14DA8CA5CA9FDE00E88C1AD60CCBA759025299079D7A427EC3CC5B619B
+       FBC828E7769BCD694E86"""
+  ]
+
+  # This test vectors was generated using Go `crypto/ecdsa.go`.
+  # Its non-deterministic ECDSA signatures.
+
+  NDPrivateKeys = [
+    """3077020101042068A2F6BCCA486C323C883328D890BA1C64A0B0CC9A8527D681
+       0AE8FDBB1B695CA00A06082A8648CE3D030107A144034200048EA1E33E80527E
+       FCAFB3E8924DD0CB3CF37DC406C65F6D69D6117B3F08A51E5280E2FE8AFAB32A
+       3EB1F4701BC7171FA62DDF46764A00E4024F286EADF3691FA0""",
+    """3081A402010104301BC69416E84B85827018F7FC9EFCB6E426C1369ECA33CF45
+       10DBE38E065D5F78CB8F75185DCF2DBF5E239F18C424CF23A00706052B810400
+       22A164036200040B63293E10AE9348832D96F3EC1A4789D7F4F3F4F16E119E52
+       4227768FED3787D2FDEE6F4B9F2749EDBF4A0F1F72CACD1C7B3E9A7E2BD6E611
+       90D71133C55E479D7F73EECD73CE9BF471CDDAE9C234F394FAC6258E3B877FE2
+       5D6397D4B266CD""",
+    """3081DC020101044201251023BBE7AA0121F34F39BD409021C4C3BB323E4729BF
+       D6842103C5628EC88F081BD01A8B27F25268CB4CFE46AE2741925EBCA3FA95C1
+       2A6D32AF161AEE2DB806A00706052B81040023A18189038186000400887F1A85
+       48791B40C677D80E70F5DFE84B50F301C4067222BDF1EE75B805227287A309C2
+       0C7E33E6FE93F651D6ABCE76E644DC16B220E34E68DCB5858262B00A07015923
+       7B66B29CABBDC352420E3652F6DCF6EB4EC6E08B0957EDC9ACC35CD684B99A78
+       E638C7937608749855C98C147DD46EE776234BA781D31C4FB05BB1D3648027"""
+  ]
+
+  NDPublicKeys = [
+    """3059301306072A8648CE3D020106082A8648CE3D030107034200048EA1E33E80
+       527EFCAFB3E8924DD0CB3CF37DC406C65F6D69D6117B3F08A51E5280E2FE8AFA
+       B32A3EB1F4701BC7171FA62DDF46764A00E4024F286EADF3691FA0""",
+    """3076301006072A8648CE3D020106052B81040022036200040B63293E10AE9348
+       832D96F3EC1A4789D7F4F3F4F16E119E524227768FED3787D2FDEE6F4B9F2749
+       EDBF4A0F1F72CACD1C7B3E9A7E2BD6E61190D71133C55E479D7F73EECD73CE9B
+       F471CDDAE9C234F394FAC6258E3B877FE25D6397D4B266CD""",
+    """30819B301006072A8648CE3D020106052B81040023038186000400887F1A8548
+       791B40C677D80E70F5DFE84B50F301C4067222BDF1EE75B805227287A309C20C
+       7E33E6FE93F651D6ABCE76E644DC16B220E34E68DCB5858262B00A070159237B
+       66B29CABBDC352420E3652F6DCF6EB4EC6E08B0957EDC9ACC35CD684B99A78E6
+       38C7937608749855C98C147DD46EE776234BA781D31C4FB05BB1D3648027"""
+  ]
+
+  NDMessages = [
+    "sample", "sample", "sample", "test", "test", "test",
+    "sample", "sample", "sample", "test", "test", "test",
+    "sample", "sample", "sample", "test", "test", "test",
+  ]
+
+  NDSignatures = [
+    """304502210088C7E8176CBA8EBE0672391AB698101FC78F187AE029ACF7EA846633
+       2892B59B022078DA1A6792B7450084085881A482313C846F66162C15D9B50CBC2F
+       19427ACC9C""",
+    """30450221008C4CD62BB25709AE0F060AAACF6FE63B87FACE3DA2B77EE545AC2289
+       7E250897022060A59D99C681DD736A6C18DC4ABF3635E749886A748908CB4E8E77
+       457212FC47""",
+    """3046022100F86C58A4607DDBD3E2C780B4FCB64848F9216D22FFBCE898BA8F9D05
+       3EAF656E022100A5C2688897C0CC471602FF86D445B09EFB12EC64C75D9096A528
+       1D90948952DE""",
+    """304402206CCE912F77B6E20709CD2A7D7C5E046674DBC958C247B1E3F7AEC766CF
+       A8EF72022056BF2A26EBD7AE4DA3080C75A2B2F247A941B87C941DC91F4FCBF19C
+       8B106DEC""",
+    """3046022100D940CBF42025B33E23C67390CBF160F78A6FE76DA6721F6551F4CA67
+       E0C8D88D022100B51E501945EF340DBB5440D44242E71F67835E5B46C5F3E19FB8
+       F5C24F036DA2""",
+    """3045022100A6BE7BADFD38D2ABEF78CE48471DA0D6580E33C2BAF4B48D1155247D
+       B5645E1E02206505D23CD41C10D1E55878FD9CF4072420F2DF7212728604F72DC2
+       B1BB8DFAB0""",
+    """306402307566A2ACC93DF36170A0A2A98CA18A979E5F3052488FAA272DDEE8306A
+       CD6B48259E2BE3170346D3EFAA69B973909BA702300B066D618D3D1FB61328594B
+       79C45F1AAE4F8C99F8FAED79A9ED8C729BC1932F11E5D05A4410FABF394CCFC6AA
+       9A6AB9""",
+    """3066023100AF3FCC8CCF5B2256ABF638BC18001985F4A8D9845EC6E1BE8E708D21
+       E60256E8CD00833EFC0F2E793BDC9B433482A09A023100DBA731B3D6B14CE8EE96
+       EDC083B97A01CE46A4B2F0583FCB9A2B7F12AC62985942DF386579E2CBBAF75C90
+       C468B7D1CB""",
+    """3065023100E9022EB07F766FCC68D345CF758FBC54EFCAC086CD8625DFDE588F67
+       D06A4357DE5F9ED39298F5D9299C7AB24E6E5984023006838D2A052990DB3A5BCC
+       12CAE45863DEC9023625C12D143DD4F75FCC50625FB35108BA2090C1FCAC48353F
+       54A03021""",
+    """3066023100C77C91B69D2064DD312A149C8074DCAC7FC734EB70AF3FF52F7F7D6E
+       4253C163FF1A574ADC30C58DDD58CF06F883B880023100F780E8D1F094F6112EC7
+       8317CF1BDEB068D1BB472D8CB6E49A707409F0A22C867A254EE80F8949260E31AB
+       5AF9AD4060""",
+    """3065023100D9027A9485BAB5BE90F2D9FCB14A494CA8B829C7A815F40DD17235D2
+       4296927122CBC11A1417D9856E815DF81AF3950202305A617D78CEA2586A55EB85
+       63B3563385753A6F84D2AF02C61F889DF6EDD6F1D0A3DE07BD859D7CB1D8264726
+       696130D6""",
+    """306502307F476CBE232E1BFED31061713B5611852B730ACB4053C6AB2D85C4563A
+       581A773B4A76F65D8DDB76D09BC038AEB3B2AC023100C778A6DCB18451A251DD9D
+       BD55F18CC45FAC16EA458270A6C7B8E0D7BC91264C66CDDB8013C17EC98365B0FA
+       6B0049AA""",
+    """30818802420137C1D1943C9ABCA116D87B46C2D7A146AE358F1378ACA58D405735
+       20B6BEDECDC500EF9172B363B862734C528ED01484822E168FB6BFDB2342A0AB45
+       8DD3B7BB8B024200FEDC89C8BF2611ABD27FDAD58E5DAAC9DD744D744017E29002
+       573D0F6F8A6B13D6901ADC07D5C6D1746910340D8C2C0D6109F939C0172D1F229A
+       818E0C6643E774""",
+    """3081880242012173FFB97D1318F53F50818DAADB5B600ED928F39CD98F712C44BB
+       810AB4EE74D02C385DFEBEFCC2DC56DE4EB2794681EC0345B170C3BEFCDF2A1693
+       9DC6DDF58D024201724AB5BED8F88B30E84CB0A2ED4BDD12EB2222C9E4FC0897B9
+       4390FD44FFE118A7EDB948E1AB7FDB1A19C920A4160DA4596DA5D2731D10143DE5
+       103FFF93A51EF6""",
+    """30818602416BADAFFFF67959764ADC0F45AB0911DE85D0FC0608A0AD60C14456E1
+       01CBF51CBBEB9D0B2E71EBE3EC1B4D45851ED71CAFE0A83DF593C803350A6BB36E
+       0EB18A21024169E20B6463357D4363BE05DF3B4FF5BC21FFAC652C7005E0314A3D
+       A443D3B537608139CE14A94C7C3A53063910F1062E385A4464022C5E662CC53833
+       EB870435E2""",
+    """308187024158F13B64E188FF6BB766D129E087420D2070752D1E1F29BF64EE13C9
+       5FF222D7E5DF595EC21FED066A83C0027CE60C1A7BD92B4641E34CBB34ECFDE5F6
+       6762659D024201105D3482639186FC0322933998FE0E71E0BA359ED9BB8DE127E5
+       73A88311F735FFD87CF279B667A2AF681122EDA9F7FC7784E0E942A287C917C7EC
+       DFE2F8E6368C""",
+    """30818802420145D48CA13B92808CAA7959574CDACF9959ED72A9ADC6FFCA0FD417
+       0F2EFD854C8C479099F0784D717A56EC9F5777A0096CD251F96F2CCB6061D2C8CA
+       CD09EB606C0242011683C215C7DE99E3D4FF8D543C6CFDCC49577A8978D10C818C
+       002A51D7C8D7FBC1814D82EDA9521F19C8895DCE6CAE97F8926CCCE3863D5E120F
+       77B6D2C891AB7F""",
+    """308187024200F235341F4C39641FFBA7FFB1551C36E34F606F4C2970DE00096A37
+       722D83D07D0ADFB3D33492F2645B15A19FFAF6424A03487CE2E099069006037956
+       9972DC798A02412B6F169D23303B0C7764620514EF308F010EFB4E3A69912967EE
+       303B177FA12B58C4602183BCB58D5DB30917584EDFE4BE4B42EC0EE3E3FB75BDA8
+       C05CB9C3A2DA"""
+  ]
+
+suite "EC NIST-P256/384/521 test suite":
+
+  test "[secp256r1] Private key serialize/deserialize test":
+    for i in 0..<TestsCount:
+      var rkey1, rkey2: EcPrivateKey
+      var skey2 = newSeq[byte](256)
+      var key = EcPrivateKey.random(Secp256r1)
+      var skey1 = key.getBytes()
+      check:
+        key.toBytes(skey2) > 0
+      check:
+        rkey1.init(skey1) == Asn1Status.Success
+        rkey2.init(skey2) == Asn1Status.Success
+      var rkey3 = EcPrivateKey.init(skey1)
+      var rkey4 = EcPrivateKey.init(skey2)
+      check:
+        rkey1 == key
+        rkey2 == key
+        rkey3 == key
+        rkey4 == key
+
+  test "[secp256r1] Public key serialize/deserialize test":
+    for i in 0..<TestsCount:
+      var rkey1, rkey2: EcPublicKey
+      var skey2 = newSeq[byte](256)
+      var pair = EcKeyPair.random(Secp256r1)
+      var skey1 = pair.pubkey.getBytes()
+      check:
+        pair.pubkey.toBytes(skey2) > 0
+        rkey1.init(skey1) == Asn1Status.Success
+        rkey2.init(skey2) == Asn1Status.Success
+      var rkey3 = EcPublicKey.init(skey1)
+      var rkey4 = EcPublicKey.init(skey2)
+      check:
+        rkey1 == pair.pubkey
+        rkey2 == pair.pubkey
+        rkey3 == pair.pubkey
+        rkey4 == pair.pubkey
+
+  test "[secp256r1] ECDHE test":
+    for i in 0..<TestsCount:
+      var kp1 = EcKeyPair.random(Secp256r1)
+      var kp2 = EcKeyPair.random(Secp256r1)
+      var shared1 = kp2.pubkey.scalarMul(kp1.seckey)
+      var shared2 = kp1.pubkey.scalarMul(kp2.seckey)
+      check:
+        isNil(shared1) == false
+        isNil(shared2) == false
+        shared1 == shared2
+
+  test "[secp256r1] ECDSA test vectors":
+    for i in 0..<2:
+      var sk = EcPrivateKey.init(stripSpaces(SignatureSecKeys[i]))
+      var expectpk = EcPublicKey.init(stripSpaces(SignaturePubKeys[i]))
+      var checkpk = sk.getKey()
+      check expectpk == checkpk
+      var checksig = sk.sign(SignatureMessages[i])
+      var expectsig = EcSignature.init(stripSpaces(SignatureVectors[i]))
+      check:
+        checksig == expectsig
+        checksig.verify(SignatureMessages[i], checkpk) == true
+      checksig.buffer[len(checksig.buffer) - 1] = 0x80'u8
+      check checksig.verify(SignatureMessages[i], checkpk) == false
+
+  test "[secp256r1] ECDSA non-deterministic test vectors":
+    var sk = EcPrivateKey.init(stripSpaces(NDPrivateKeys[0]))
+    var pk = EcPublicKey.init(stripSpaces(NDPublicKeys[0]))
+    var checkpk = sk.getKey()
+    check pk == checkpk
+    for i in 0..<6:
+      var message = NDMessages[i]
+      var checksig = EcSignature.init(stripSpaces(NDSignatures[i]))
+      check checksig.verify(message, pk) == true
+      checksig.buffer[len(checksig.buffer) - 1] = 0x80'u8
+      check checksig.verify(message, pk) == false
+
+  test "[secp256r1] Generate/Sign/Serialize/Deserialize/Verify test":
+    var message = "message to sign"
+    for i in 0..<TestsCount:
+      var kp = EcKeyPair.random(Secp256r1)
+      var sig = kp.seckey.sign(message)
+      var sersk = kp.seckey.getBytes()
+      var serpk = kp.pubkey.getBytes()
+      var sersig = sig.getBytes()
+      var seckey = EcPrivateKey.init(sersk)
+      var pubkey = EcPublicKey.init(serpk)
+      var csig = EcSignature.init(sersig)
+      check csig.verify(message, pubkey) == true
+      csig.buffer[len(csig.buffer) - 1] = 0x80'u8
+      check csig.verify(message, pubkey) == false
+
+  test "[secp384r1] Private key serialize/deserialize test":
+    for i in 0..<TestsCount:
+      var rkey1, rkey2: EcPrivateKey
+      var skey2 = newSeq[byte](256)
+      var key = EcPrivateKey.random(Secp384r1)
+      var skey1 = key.getBytes()
+      check:
+        key.toBytes(skey2) > 0
+      check:
+        rkey1.init(skey1) == Asn1Status.Success
+        rkey2.init(skey2) == Asn1Status.Success
+      var rkey3 = EcPrivateKey.init(skey1)
+      var rkey4 = EcPrivateKey.init(skey2)
+      check:
+        rkey1 == key
+        rkey2 == key
+        rkey3 == key
+        rkey4 == key
+
+  test "[secp384r1] Public key serialize/deserialize test":
+    for i in 0..<TestsCount:
+      var rkey1, rkey2: EcPublicKey
+      var skey2 = newSeq[byte](256)
+      var pair = EcKeyPair.random(Secp384r1)
+      var skey1 = pair.pubkey.getBytes()
+      check:
+        pair.pubkey.toBytes(skey2) > 0
+        rkey1.init(skey1) == Asn1Status.Success
+        rkey2.init(skey2) == Asn1Status.Success
+      var rkey3 = EcPublicKey.init(skey1)
+      var rkey4 = EcPublicKey.init(skey2)
+      check:
+        rkey1 == pair.pubkey
+        rkey2 == pair.pubkey
+        rkey3 == pair.pubkey
+        rkey4 == pair.pubkey
+
+  test "[secp384r1] ECDHE test":
+    for i in 0..<TestsCount:
+      var kp1 = EcKeyPair.random(Secp384r1)
+      var kp2 = EcKeyPair.random(Secp384r1)
+      var shared1 = kp2.pubkey.scalarMul(kp1.seckey)
+      var shared2 = kp1.pubkey.scalarMul(kp2.seckey)
+      check:
+        isNil(shared1) == false
+        isNil(shared2) == false
+        shared1 == shared2
+
+  test "[secp384r1] ECDSA test vectors":
+    for i in 2..<4:
+      var sk = EcPrivateKey.init(stripSpaces(SignatureSecKeys[i]))
+      var expectpk = EcPublicKey.init(stripSpaces(SignaturePubKeys[i]))
+      var checkpk = sk.getKey()
+      check expectpk == checkpk
+      var checksig = sk.sign(SignatureMessages[i])
+      var expectsig = EcSignature.init(stripSpaces(SignatureVectors[i]))
+      check:
+        checksig == expectsig
+        checksig.verify(SignatureMessages[i], checkpk) == true
+      checksig.buffer[len(checksig.buffer) - 1] = 0x80'u8
+      check checksig.verify(SignatureMessages[i], checkpk) == false
+
+  test "[secp384r1] ECDSA non-deterministic test vectors":
+    var sk = EcPrivateKey.init(stripSpaces(NDPrivateKeys[1]))
+    var pk = EcPublicKey.init(stripSpaces(NDPublicKeys[1]))
+    var checkpk = sk.getKey()
+    check pk == checkpk
+    for i in 6..<12:
+      var message = NDMessages[i]
+      var checksig = EcSignature.init(stripSpaces(NDSignatures[i]))
+      check checksig.verify(message, pk) == true
+      checksig.buffer[len(checksig.buffer) - 1] = 0x80'u8
+      check checksig.verify(message, pk) == false
+
+  test "[secp384r1] Generate/Sign/Serialize/Deserialize/Verify test":
+    var message = "message to sign"
+    for i in 0..<TestsCount:
+      var kp = EcKeyPair.random(Secp384r1)
+      var sig = kp.seckey.sign(message)
+      var sersk = kp.seckey.getBytes()
+      var serpk = kp.pubkey.getBytes()
+      var sersig = sig.getBytes()
+      var seckey = EcPrivateKey.init(sersk)
+      var pubkey = EcPublicKey.init(serpk)
+      var csig = EcSignature.init(sersig)
+      check csig.verify(message, pubkey) == true
+      csig.buffer[len(csig.buffer) - 1] = 0x80'u8
+      check csig.verify(message, pubkey) == false
+
+  test "[secp521r1] Private key serialize/deserialize test":
+    for i in 0..<TestsCount:
+      var rkey1, rkey2: EcPrivateKey
+      var skey2 = newSeq[byte](256)
+      var key = EcPrivateKey.random(Secp521r1)
+      var skey1 = key.getBytes()
+      check:
+        key.toBytes(skey2) > 0
+      check:
+        rkey1.init(skey1) == Asn1Status.Success
+        rkey2.init(skey2) == Asn1Status.Success
+      var rkey3 = EcPrivateKey.init(skey1)
+      var rkey4 = EcPrivateKey.init(skey2)
+      check:
+        rkey1 == key
+        rkey2 == key
+        rkey3 == key
+        rkey4 == key
+
+  test "[secp521r1] Public key serialize/deserialize test":
+    for i in 0..<TestsCount:
+      var rkey1, rkey2: EcPublicKey
+      var skey2 = newSeq[byte](256)
+      var pair = EcKeyPair.random(Secp521r1)
+      var skey1 = pair.pubkey.getBytes()
+      check:
+        pair.pubkey.toBytes(skey2) > 0
+        rkey1.init(skey1) == Asn1Status.Success
+        rkey2.init(skey2) == Asn1Status.Success
+      var rkey3 = EcPublicKey.init(skey1)
+      var rkey4 = EcPublicKey.init(skey2)
+      check:
+        rkey1 == pair.pubkey
+        rkey2 == pair.pubkey
+        rkey3 == pair.pubkey
+        rkey4 == pair.pubkey
+
+  test "[secp521r1] ECDHE test":
+    for i in 0..<TestsCount:
+      var kp1 = EcKeyPair.random(Secp521r1)
+      var kp2 = EcKeyPair.random(Secp521r1)
+      var shared1 = kp2.pubkey.scalarMul(kp1.seckey)
+      var shared2 = kp1.pubkey.scalarMul(kp2.seckey)
+      check:
+        isNil(shared1) == false
+        isNil(shared2) == false
+        shared1 == shared2
+
+  test "[secp521r1] ECDSA test vectors":
+    for i in 4..<6:
+      var sk = EcPrivateKey.init(stripSpaces(SignatureSecKeys[i]))
+      var expectpk = EcPublicKey.init(stripSpaces(SignaturePubKeys[i]))
+      var checkpk = sk.getKey()
+      check expectpk == checkpk
+      var checksig = sk.sign(SignatureMessages[i])
+      var expectsig = EcSignature.init(stripSpaces(SignatureVectors[i]))
+      check:
+        checksig == expectsig
+        checksig.verify(SignatureMessages[i], checkpk) == true
+      checksig.buffer[len(checksig.buffer) - 1] = 0x80'u8
+      check checksig.verify(SignatureMessages[i], checkpk) == false
+
+  test "[secp521r1] ECDSA non-deterministic test vectors":
+    var sk = EcPrivateKey.init(stripSpaces(NDPrivateKeys[2]))
+    var pk = EcPublicKey.init(stripSpaces(NDPublicKeys[2]))
+    var checkpk = sk.getKey()
+    check pk == checkpk
+    for i in 12..<18:
+      var message = NDMessages[i]
+      var checksig = EcSignature.init(stripSpaces(NDSignatures[i]))
+      check checksig.verify(message, pk) == true
+      checksig.buffer[len(checksig.buffer) - 1] = 0x80'u8
+      check checksig.verify(message, pk) == false
+
+  test "[secp521r1] Generate/Sign/Serialize/Deserialize/Verify test":
+    var message = "message to sign"
+    for i in 0..<TestsCount:
+      var kp = EcKeyPair.random(Secp521r1)
+      var sig = kp.seckey.sign(message)
+      var sersk = kp.seckey.getBytes()
+      var serpk = kp.pubkey.getBytes()
+      var sersig = sig.getBytes()
+      var seckey = EcPrivateKey.init(sersk)
+      var pubkey = EcPublicKey.init(serpk)
+      var csig = EcSignature.init(sersig)
+      check csig.verify(message, pubkey) == true
+      csig.buffer[len(csig.buffer) - 1] = 0x80'u8
+      check csig.verify(message, pubkey) == false