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secp: use upstream secp convenience api (#141) 

* secp: use upstream secp convenience api
This commit is contained in:
Jacek Sieka 2020-04-17 12:51:13 +02:00 committed by GitHub
parent 4d1fc9dacd
commit e8b33c64fa
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3 changed files with 77 additions and 204 deletions
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1
libp2p.nimble
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@ -8,7 +8,6 @@ license = "MIT"
skipDirs = @["tests", "examples", "Nim"]
requires "nim >= 1.2.0",
"secp256k1",
"nimcrypto >= 0.4.1",
"chronos >= 2.3.8",
"bearssl >= 0.1.4",

271
libp2p/crypto/secp.nim
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@ -6,8 +6,7 @@
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
import secp256k1, nimcrypto/sysrand, nimcrypto/utils, nimcrypto/hash,
nimcrypto/sha2
import secp256k1 as s, stew/byteutils, nimcrypto/hash, nimcrypto/sha2
export sha2
const
@ -19,177 +18,104 @@ const
## Size of public key in octets (bytes)
type
SkPublicKey* = secp256k1_pubkey
## Representation of public key.
SkPrivateKey* = object
## Representation of secret key.
data*: array[SkRawPrivateKeySize, byte]
SkKeyPair* = object
## Representation of private/public keys pair.
seckey*: SkPrivateKey
pubkey*: SkPublicKey
SkSignature* = secp256k1_ecdsa_signature
## Representation of signature.
SkContext* = ref object
## Representation of Secp256k1 context object.
context: ptr secp256k1_context
error: string
SkPublicKey* = distinct s.SkPublicKey
SkPrivateKey* = distinct s.SkSecretKey
SkKeyPair* = distinct s.SkKeyPair
SkSignature* = distinct s.SkSignature
Secp256k1Error* = object of CatchableError
## Exceptions generated by `libsecp256k1`
##
## Private procedures interface
##
template toException(v: cstring): (ref Secp256k1Error) =
(ref Secp256k1Error)(msg: $v)
var secpContext {.threadvar.}: SkContext
## Thread local variable which holds current context
template pubkey*(v: SkKeyPair): SkPublicKey = SkPublicKey(s.SkKeyPair(v).pubkey)
template seckey*(v: SkKeyPair): SkPrivateKey = SkPrivateKey(s.SkKeyPair(v).seckey)
proc illegalCallback(message: cstring, data: pointer) {.cdecl, raises: [].} =
let ctx = cast[SkContext](data)
ctx.error = $message
proc errorCallback(message: cstring, data: pointer) {.cdecl, raises: [].} =
let ctx = cast[SkContext](data)
ctx.error = $message
proc shutdownLibsecp256k1(ctx: SkContext) =
# TODO: use destructor when finalizer are deprecated for destructors
if not(isNil(ctx.context)):
secp256k1_context_destroy(ctx.context)
proc newSkContext(): SkContext =
## Create new Secp256k1 context object.
new(result, shutdownLibsecp256k1)
let flags = cuint(SECP256K1_CONTEXT_VERIFY or SECP256K1_CONTEXT_SIGN)
result.context = secp256k1_context_create(flags)
secp256k1_context_set_illegal_callback(result.context, illegalCallback,
cast[pointer](result))
secp256k1_context_set_error_callback(result.context, errorCallback,
cast[pointer](result))
result.error = ""
proc getContext(): SkContext =
## Get current `EccContext`
if isNil(secpContext):
secpContext = newSkContext()
result = secpContext
template raiseSecp256k1Error() =
## Raises `libsecp256k1` error as exception
let mctx = getContext()
if len(mctx.error) > 0:
let msg = mctx.error
mctx.error.setLen(0)
raise newException(Secp256k1Error, msg)
else:
raise newException(Secp256k1Error, "")
proc init*(key: var SkPrivateKey, data: openarray[byte]): bool =
proc init*(key: var SkPrivateKey, data: openarray[byte]): bool {.raises: [Defect].} =
## Initialize Secp256k1 `private key` ``key`` from raw binary
## representation ``data``.
##
## Procedure returns ``true`` on success.
let ctx = getContext()
if len(data) >= SkRawPrivateKeySize:
let res = secp256k1_ec_seckey_verify(ctx.context,
cast[ptr cuchar](unsafeAddr data[0]))
result = (res == 1) and (len(ctx.error) == 0)
if result:
copyMem(addr key.data[0], unsafeAddr data[0], SkRawPrivateKeySize)
if (let v = SkSecretKey.fromRaw(data); v.isOk):
key = SkPrivateKey(v[])
return true
proc init*(key: var SkPrivateKey, data: string): bool {.inline.} =
proc init*(key: var SkPrivateKey, data: string): bool {.raises: [Defect].} =
## Initialize Secp256k1 `private key` ``key`` from hexadecimal string
## representation ``data``.
##
## Procedure returns ``true`` on success.
var buffer: seq[byte]
try:
buffer = utils.fromHex(stripSpaces(data))
except:
return false
result = init(key, buffer)
key = SkPrivateKey(SkSecretKey.fromHex(data).tryGet())
return true
except Secp256k1Error:
discard
proc init*(key: var SkPublicKey, data: openarray[byte]): bool =
proc init*(key: var SkPublicKey, data: openarray[byte]): bool {.raises: [Defect].} =
## Initialize Secp256k1 `public key` ``key`` from raw binary
## representation ``data``.
##
## Procedure returns ``true`` on success.
let ctx = getContext()
var length = 0
if len(data) > 0:
if data[0] == 0x02'u8 or data[0] == 0x03'u8:
length = min(len(data), 33)
elif data[0] == 0x04'u8 or data[0] == 0x06'u8 or data[0] == 0x07'u8:
length = min(len(data), 65)
else:
return false
let res = secp256k1_ec_pubkey_parse(ctx.context, addr key,
cast[ptr cuchar](unsafeAddr data[0]),
csize_t(length))
result = (res == 1) and (len(ctx.error) == 0)
try:
key = SkPublicKey(s.SkPublicKey.fromRaw(data).tryGet())
return true
except Secp256k1Error:
discard
proc init*(key: var SkPublicKey, data: string): bool =
proc init*(key: var SkPublicKey, data: string): bool {.raises: [Defect].} =
## Initialize Secp256k1 `public key` ``key`` from hexadecimal string
## representation ``data``.
##
## Procedure returns ``true`` on success.
var buffer: seq[byte]
try:
buffer = utils.fromHex(stripSpaces(data))
except:
return false
result = init(key, buffer)
key = SkPublicKey(s.SkPublicKey.fromHex(data).tryGet())
return true
except Secp256k1Error:
discard
proc init*(sig: var SkSignature, data: openarray[byte]): bool =
proc init*(sig: var SkSignature, data: openarray[byte]): bool {.raises: [Defect].} =
## Initialize Secp256k1 `signature` ``sig`` from raw binary
## representation ``data``.
##
## Procedure returns ``true`` on success.
let ctx = getContext()
let length = len(data)
if length >= 0:
let res = secp256k1_ecdsa_signature_parse_der(ctx.context, addr sig,
cast[ptr cuchar](unsafeAddr data[0]),
csize_t(length))
result = (res == 1) and (len(ctx.error) == 0)
try:
sig = SkSignature(s.SkSignature.fromDer(data).tryGet())
return true
except Secp256k1Error:
discard
proc init*(sig: var SkSignature, data: string): bool =
proc init*(sig: var SkSignature, data: string): bool {.raises: [Defect].} =
## Initialize Secp256k1 `signature` ``sig`` from hexadecimal string
## representation ``data``.
##
## Procedure returns ``true`` on success.
# TODO DER vs raw here is fishy
var buffer: seq[byte]
try:
buffer = utils.fromHex(stripSpaces(data))
except:
buffer = hexToSeqByte(data)
except ValueError:
return false
result = init(sig, buffer)
proc init*(t: typedesc[SkPrivateKey],
data: openarray[byte]): SkPrivateKey {.inline.} =
data: openarray[byte]): SkPrivateKey {.raises: [Defect, Secp256k1Error].} =
## Initialize Secp256k1 `private key` from raw binary
## representation ``data``.
##
## Procedure returns `private key` on success.
if not init(result, data):
raise newException(Secp256k1Error, "Incorrect binary form")
SkPrivateKey(s.SkSecretKey.fromRaw(data).tryGet())
proc init*(t: typedesc[SkPrivateKey],
data: string): SkPrivateKey {.inline.} =
data: string): SkPrivateKey {.raises: [Defect, Secp256k1Error].} =
## Initialize Secp256k1 `private key` from hexadecimal string
## representation ``data``.
##
## Procedure returns `private key` on success.
if not init(result, data):
raise newException(Secp256k1Error, "Incorrect binary form")
s.SkSecretKey.fromHex(data).tryGet()
proc init*(t: typedesc[SkPublicKey],
data: openarray[byte]): SkPublicKey {.inline.} =
data: openarray[byte]): SkPublicKey {.raises: [Defect, Secp256k1Error].} =
## Initialize Secp256k1 `public key` from raw binary
## representation ``data``.
##
@ -198,7 +124,7 @@ proc init*(t: typedesc[SkPublicKey],
raise newException(Secp256k1Error, "Incorrect binary form")
proc init*(t: typedesc[SkPublicKey],
data: string): SkPublicKey {.inline.} =
data: string): SkPublicKey {.raises: [Defect, Secp256k1Error].} =
## Initialize Secp256k1 `public key` from hexadecimal string
## representation ``data``.
##
@ -207,7 +133,7 @@ proc init*(t: typedesc[SkPublicKey],
raise newException(Secp256k1Error, "Incorrect binary form")
proc init*(t: typedesc[SkSignature],
data: openarray[byte]): SkSignature {.inline.} =
data: openarray[byte]): SkSignature {.raises: [Defect, Secp256k1Error].} =
## Initialize Secp256k1 `signature` from raw binary
## representation ``data``.
##
@ -216,7 +142,7 @@ proc init*(t: typedesc[SkSignature],
raise newException(Secp256k1Error, "Incorrect binary form")
proc init*(t: typedesc[SkSignature],
data: string): SkSignature {.inline.} =
data: string): SkSignature {.raises: [Defect, Secp256k1Error].} =
## Initialize Secp256k1 `signature` from hexadecimal string
## representation ``data``.
##
@ -224,28 +150,17 @@ proc init*(t: typedesc[SkSignature],
if not init(result, data):
raise newException(Secp256k1Error, "Incorrect binary form")
proc getKey*(key: SkPrivateKey): SkPublicKey =
proc getKey*(key: SkPrivateKey): SkPublicKey {.raises: [Defect, Secp256k1Error].} =
## Calculate and return Secp256k1 `public key` from `private key` ``key``.
let ctx = getContext()
let res = secp256k1_ec_pubkey_create(ctx.context, addr result,
cast[ptr cuchar](unsafeAddr key))
if (res != 1) or (len(ctx.error) != 0):
raiseSecp256k1Error()
SkPublicKey(s.SkSecretKey(key).toPublicKey().tryGet())
proc random*(t: typedesc[SkPrivateKey]): SkPrivateKey =
## Generates new random private key.
let ctx = getContext()
while true:
if randomBytes(result.data) == SkRawPrivateKeySize:
let res = secp256k1_ec_seckey_verify(ctx.context,
cast[ptr cuchar](addr result.data[0]))
if (res == 1) and (len(ctx.error) == 0):
break
SkPrivateKey(s.SkSecretKey.random().tryGet())
proc random*(t: typedesc[SkKeyPair]): SkKeyPair {.inline.} =
## Generates new random key pair.
result.seckey = SkPrivateKey.random()
result.pubkey = result.seckey.getKey()
SkKeyPair(s.SkKeyPair.random().tryGet())
proc toBytes*(key: SkPrivateKey, data: var openarray[byte]): int =
## Serialize Secp256k1 `private key` ``key`` to raw binary form and store it
@ -255,7 +170,7 @@ proc toBytes*(key: SkPrivateKey, data: var openarray[byte]): int =
## Secp256k1 private key.
result = SkRawPrivateKeySize
if len(data) >= SkRawPrivateKeySize:
copyMem(addr data[0], unsafeAddr key.data[0], SkRawPrivateKeySize)
data[0..<SkRawPrivateKeySize] = s.SkSecretKey(key).toRaw()
proc toBytes*(key: SkPublicKey, data: var openarray[byte]): int =
## Serialize Secp256k1 `public key` ``key`` to raw binary form and store it
@ -263,14 +178,9 @@ proc toBytes*(key: SkPublicKey, data: var openarray[byte]): int =
##
## Procedure returns number of bytes (octets) needed to store
## Secp256k1 public key.
let ctx = getContext()
var length = csize_t(len(data))
result = SkRawPublicKeySize
if len(data) >= SkRawPublicKeySize:
discard secp256k1_ec_pubkey_serialize(ctx.context,
cast[ptr cuchar](addr data[0]),
addr length, unsafeAddr key,
SECP256K1_EC_COMPRESSED)
data[0..<SkRawPublicKeySize] = s.SkPublicKey(key).toRawCompressed()
proc toBytes*(sig: SkSignature, data: var openarray[byte]): int =
## Serialize Secp256k1 `signature` ``sig`` to raw binary form and store it
@ -278,25 +188,15 @@ proc toBytes*(sig: SkSignature, data: var openarray[byte]): int =
##
## Procedure returns number of bytes (octets) needed to store
## Secp256k1 signature.
let ctx = getContext()
var buffer: array[72, byte]
let pdata = cast[ptr cuchar](addr buffer[0])
var plength = csize_t(len(buffer))
discard secp256k1_ecdsa_signature_serialize_der(ctx.context, pdata,
addr plength,
unsafeAddr sig)
result = int(plength)
if len(data) >= result:
copyMem(addr data[0], addr buffer[0], result)
s.SkSignature(sig).toDer(data)
proc getBytes*(key: SkPrivateKey): seq[byte] {.inline.} =
## Serialize Secp256k1 `private key` and return it.
result = @(key.data)
result = @(s.SkSecretKey(key).toRaw())
proc getBytes*(key: SkPublicKey): seq[byte] {.inline.} =
## Serialize Secp256k1 `public key` and return it.
result = newSeq[byte](SkRawPublicKeySize)
discard toBytes(key, result)
result = @(s.SkPublicKey(key).toRawCompressed())
proc getBytes*(sig: SkSignature): seq[byte] {.inline.} =
## Serialize Secp256k1 `signature` and return it.
@ -306,74 +206,47 @@ proc getBytes*(sig: SkSignature): seq[byte] {.inline.} =
proc `==`*(ska, skb: SkPrivateKey): bool =
## Compare Secp256k1 `private key` objects for equality.
result = (ska.data == skb.data)
result = (s.SkSecretKey(ska).toRaw == s.SkSecretKey(skb).toRaw)
proc `==`*(pka, pkb: SkPublicKey): bool =
## Compare Secp256k1 `public key` objects for equality.
var
akey: array[SkRawPublicKeySize, byte]
bkey: array[SkRawPublicKeySize, byte]
discard pka.toBytes(akey)
discard pkb.toBytes(bkey)
result = (akey == bkey)
result = (s.SkPublicKey(pka).toRaw == s.SkPublicKey(pkb).toRaw)
proc `==`*(sia, sib: SkSignature): bool =
## Compare Secp256k1 `signature` objects for equality.
var
asig: array[SkRawSignatureSize, byte]
bsig: array[SkRawSignatureSize, byte]
discard sia.toBytes(asig)
discard sib.toBytes(bsig)
result = (asig == bsig)
result = (s.SkSignature(sia).toRaw == s.SkSignature(sib).toRaw)
proc `$`*(key: SkPrivateKey): string = toHex(key.data)
proc `$`*(key: SkPrivateKey): string = s.SkSecretKey(key).toHex()
## Return string representation of Secp256k1 `private key`.
proc `$`*(key: SkPublicKey): string =
## Return string representation of Secp256k1 `private key`.s
var spub: array[SkRawPublicKeySize, byte]
discard key.toBytes(spub)
result = toHex(spub)
result = toHex(s.SkPublicKey(key).toRawCompressed())
proc `$`*(sig: SkSignature): string =
## Return string representation of Secp256k1 `signature`.s
result = toHex(sig.data)
result = toHex(s.SkSignature(sig).toDer())
proc sign*[T: byte|char](key: SkPrivateKey, msg: openarray[T]): SkSignature =
## Sign message `msg` using private key `key` and return signature object.
let ctx = getContext()
var hash = sha256.digest(msg)
let res = secp256k1_ecdsa_sign(ctx.context, addr result,
cast[ptr cuchar](addr hash.data[0]),
cast[ptr cuchar](unsafeAddr key),
nil, nil)
if (res != 1) or (len(ctx.error) != 0):
raiseSecp256k1Error()
let h = sha256.digest(msg)
SkSignature(sign(s.SkSecretKey(key), h).tryGet())
proc verify*[T: byte|char](sig: SkSignature, msg: openarray[T],
key: SkPublicKey): bool =
let ctx = getContext()
var hash = sha256.digest(msg)
let res = secp256k1_ecdsa_verify(ctx.context, unsafeAddr sig,
cast[ptr cuchar](addr hash.data[0]),
unsafeAddr key)
if (res == 1) and (len(ctx.error) == 0):
result = true
let h = sha256.digest(msg)
verify(s.SkSignature(sig), h, s.SkPublicKey(key))
proc clear*(key: var SkPrivateKey) {.inline.} =
proc clear*(key: var SkPrivateKey) {.borrow.}
## Wipe and clear memory of Secp256k1 `private key`.
burnMem(key.data)
proc clear*(key: var SkPublicKey) {.inline.} =
proc clear*(key: var SkPublicKey) {.borrow.}
## Wipe and clear memory of Secp256k1 `public key`.
burnMem(addr key, SkRawPrivateKeySize * 2)
proc clear*(sig: var SkSignature) {.inline.} =
proc clear*(sig: var SkSignature) {.borrow.}
## Wipe and clear memory of Secp256k1 `signature`.
# Internal memory representation size of signature object is 64 bytes.
burnMem(addr sig, SkRawPrivateKeySize * 2)
proc clear*(pair: var SkKeyPair) {.inline.} =
## Wipe and clear memory of Secp256k1 `key pair`.
pair.seckey.clear()
pair.pubkey.clear()
proc clear*(pair: var SkKeyPair) {.borrow.}
proc verify*(seckey: SkPrivateKey): bool {.borrow.}

9
tests/testsecp256k1.nim
View File

@ -35,8 +35,8 @@ suite "Secp256k1 testing suite":
rkey1.clear()
rkey2.clear()
check:
isFullZero(rkey1.data) == true
isFullZero(rkey2.data) == true
not rkey1.verify()
not rkey2.verify()
test "Public key serialize/deserialize test":
for i in 0..<TestsCount:
var rkey1, rkey2: SkPublicKey
@ -68,6 +68,7 @@ suite "Secp256k1 testing suite":
var pubkey = SkPublicKey.init(serpk)
var csig = SkSignature.init(sersig)
check csig.verify(message, pubkey) == true
let error = len(csig.data) - 1
csig.data[error] = not(csig.data[error])
var error = csig.getBytes()
error[^1] = not error[^1]
csig = SkSignature.init(error)
check csig.verify(message, pubkey) == false