forked from lian/bitcoin-ruby
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openssl.rb
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openssl.rb
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# encoding: ascii-8bit
# autoload when you need to re-generate a public_key from only its private_key.
# ported from: https://github.com/sipa/bitcoin/blob/2d40fe4da9ea82af4b652b691a4185431d6e47a8/key.h
require 'ffi'
module Bitcoin
module OpenSSL_EC
extend FFI::Library
if FFI::Platform.windows?
ffi_lib 'libeay32', 'ssleay32'
else
ffi_lib [ 'libssl.so.1.0.0', 'ssl' ]
end
NID_secp256k1 = 714
POINT_CONVERSION_COMPRESSED = 2
POINT_CONVERSION_UNCOMPRESSED = 4
attach_function :SSL_library_init, [], :int
attach_function :ERR_load_crypto_strings, [], :void
attach_function :SSL_load_error_strings, [], :void
attach_function :RAND_poll, [], :int
attach_function :BN_CTX_free, [:pointer], :int
attach_function :BN_CTX_new, [], :pointer
attach_function :BN_add, [:pointer, :pointer, :pointer], :int
attach_function :BN_bin2bn, [:pointer, :int, :pointer], :pointer
attach_function :BN_bn2bin, [:pointer, :pointer], :int
attach_function :BN_cmp, [:pointer, :pointer], :int
attach_function :BN_copy, [:pointer, :pointer], :pointer
attach_function :BN_dup, [:pointer], :pointer
attach_function :BN_free, [:pointer], :int
attach_function :BN_mod_inverse, [:pointer, :pointer, :pointer, :pointer], :pointer
attach_function :BN_mod_mul, [:pointer, :pointer, :pointer, :pointer, :pointer], :int
attach_function :BN_mod_sub, [:pointer, :pointer, :pointer, :pointer, :pointer], :int
attach_function :BN_mul_word, [:pointer, :int], :int
attach_function :BN_new, [], :pointer
attach_function :BN_rshift, [:pointer, :pointer, :int], :int
attach_function :BN_rshift1, [:pointer, :pointer], :int
attach_function :BN_set_word, [:pointer, :int], :int
attach_function :BN_sub, [:pointer, :pointer, :pointer], :int
attach_function :EC_GROUP_get_curve_GFp, [:pointer, :pointer, :pointer, :pointer, :pointer], :int
attach_function :EC_GROUP_get_degree, [:pointer], :int
attach_function :EC_GROUP_get_order, [:pointer, :pointer, :pointer], :int
attach_function :EC_KEY_free, [:pointer], :int
attach_function :EC_KEY_get0_group, [:pointer], :pointer
attach_function :EC_KEY_get0_private_key, [:pointer], :pointer
attach_function :EC_KEY_new_by_curve_name, [:int], :pointer
attach_function :EC_KEY_set_conv_form, [:pointer, :int], :void
attach_function :EC_KEY_set_private_key, [:pointer, :pointer], :int
attach_function :EC_KEY_set_public_key, [:pointer, :pointer], :int
attach_function :EC_POINT_free, [:pointer], :int
attach_function :EC_POINT_is_at_infinity, [:pointer, :pointer], :int
attach_function :EC_POINT_mul, [:pointer, :pointer, :pointer, :pointer, :pointer, :pointer], :int
attach_function :EC_POINT_new, [:pointer], :pointer
attach_function :EC_POINT_set_compressed_coordinates_GFp, [:pointer, :pointer, :pointer, :int, :pointer], :int
attach_function :d2i_ECPrivateKey, [:pointer, :pointer, :long], :pointer
attach_function :i2d_ECPrivateKey, [:pointer, :pointer], :int
attach_function :i2o_ECPublicKey, [:pointer, :pointer], :uint
attach_function :EC_KEY_check_key, [:pointer], :uint
attach_function :ECDSA_do_sign, [:pointer, :uint, :pointer], :pointer
attach_function :BN_num_bits, [:pointer], :int
attach_function :ECDSA_SIG_free, [:pointer], :void
attach_function :EC_POINT_add, [:pointer, :pointer, :pointer, :pointer, :pointer], :int
attach_function :EC_POINT_point2hex, [:pointer, :pointer, :int, :pointer], :string
attach_function :EC_POINT_hex2point, [:pointer, :string, :pointer, :pointer], :pointer
attach_function :ECDSA_SIG_new, [], :pointer
attach_function :d2i_ECDSA_SIG, [:pointer, :pointer, :long], :pointer
attach_function :i2d_ECDSA_SIG, [:pointer, :pointer], :int
attach_function :OPENSSL_free, :CRYPTO_free, [:pointer], :void
def self.BN_num_bytes(ptr); (BN_num_bits(ptr) + 7) / 8; end
# resolve public from private key, using ffi and libssl.so
# example:
# keypair = Bitcoin.generate_key; Bitcoin::OpenSSL_EC.regenerate_key(keypair.first) == keypair
def self.regenerate_key(private_key)
private_key = [private_key].pack("H*") if private_key.bytesize >= (32*2)
private_key_hex = private_key.unpack("H*")[0]
#private_key = FFI::MemoryPointer.new(:uint8, private_key.bytesize)
# .put_bytes(0, private_key, 0, private_key.bytesize)
private_key = FFI::MemoryPointer.from_string(private_key)
init_ffi_ssl
eckey = EC_KEY_new_by_curve_name(NID_secp256k1)
#priv_key = BN_bin2bn(private_key, private_key.size, BN_new())
priv_key = BN_bin2bn(private_key, private_key.size-1, BN_new())
group, order, ctx = EC_KEY_get0_group(eckey), BN_new(), BN_CTX_new()
EC_GROUP_get_order(group, order, ctx)
pub_key = EC_POINT_new(group)
EC_POINT_mul(group, pub_key, priv_key, nil, nil, ctx)
EC_KEY_set_private_key(eckey, priv_key)
EC_KEY_set_public_key(eckey, pub_key)
BN_free(order)
BN_CTX_free(ctx)
EC_POINT_free(pub_key)
BN_free(priv_key)
length = i2d_ECPrivateKey(eckey, nil)
buf = FFI::MemoryPointer.new(:uint8, length)
ptr = FFI::MemoryPointer.new(:pointer).put_pointer(0, buf)
priv_hex = if i2d_ECPrivateKey(eckey, ptr) == length
size = buf.get_array_of_uint8(8, 1)[0]
buf.get_array_of_uint8(9, size).pack("C*").rjust(32, "\x00").unpack("H*")[0]
#der_to_private_key( ptr.read_pointer.read_string(length).unpack("H*")[0] )
end
if priv_hex != private_key_hex
raise "regenerated wrong private_key, raise here before generating a faulty public_key too!"
end
length = i2o_ECPublicKey(eckey, nil)
buf = FFI::MemoryPointer.new(:uint8, length)
ptr = FFI::MemoryPointer.new(:pointer).put_pointer(0, buf)
pub_hex = if i2o_ECPublicKey(eckey, ptr) == length
buf.read_string(length).unpack("H*")[0]
end
EC_KEY_free(eckey)
[ priv_hex, pub_hex ]
end
# extract private key from uncompressed DER format
def self.der_to_private_key(der_hex)
init_ffi_ssl
#k = EC_KEY_new_by_curve_name(NID_secp256k1)
#kp = FFI::MemoryPointer.new(:pointer).put_pointer(0, eckey)
buf = FFI::MemoryPointer.from_string([der_hex].pack("H*"))
ptr = FFI::MemoryPointer.new(:pointer).put_pointer(0, buf)
#ec_key = d2i_ECPrivateKey(kp, ptr, buf.size-1)
ec_key = d2i_ECPrivateKey(nil, ptr, buf.size-1)
return nil if ec_key.null?
bn = EC_KEY_get0_private_key(ec_key)
BN_bn2bin(bn, buf)
buf.read_string(32).unpack("H*")[0]
end
# Given the components of a signature and a selector value, recover and
# return the public key that generated the signature according to the
# algorithm in SEC1v2 section 4.1.6.
#
# rec_id is an index from 0 to 3 that indicates which of the 4 possible
# keys is the correct one. Because the key recovery operation yields
# multiple potential keys, the correct key must either be stored alongside
# the signature, or you must be willing to try each rec_id in turn until
# you find one that outputs the key you are expecting.
#
# If this method returns nil, it means recovery was not possible and rec_id
# should be iterated.
#
# Given the above two points, a correct usage of this method is inside a
# for loop from 0 to 3, and if the output is nil OR a key that is not the
# one you expect, you try again with the next rec_id.
#
# message_hash = hash of the signed message.
# signature = the R and S components of the signature, wrapped.
# rec_id = which possible key to recover.
# is_compressed = whether or not the original pubkey was compressed.
def self.recover_public_key_from_signature(message_hash, signature, rec_id, is_compressed)
return nil if rec_id < 0 or signature.bytesize != 65
init_ffi_ssl
signature = FFI::MemoryPointer.from_string(signature)
#signature_bn = BN_bin2bn(signature, 65, BN_new())
r = BN_bin2bn(signature[1], 32, BN_new())
s = BN_bin2bn(signature[33], 32, BN_new())
n, i = 0, rec_id / 2
eckey = EC_KEY_new_by_curve_name(NID_secp256k1)
EC_KEY_set_conv_form(eckey, POINT_CONVERSION_COMPRESSED) if is_compressed
group = EC_KEY_get0_group(eckey)
order = BN_new()
EC_GROUP_get_order(group, order, nil)
x = BN_dup(order)
BN_mul_word(x, i)
BN_add(x, x, r)
field = BN_new()
EC_GROUP_get_curve_GFp(group, field, nil, nil, nil)
if BN_cmp(x, field) >= 0
[r, s, order, x, field].each{|i| BN_free(i) }
EC_KEY_free(eckey)
return nil
end
big_r = EC_POINT_new(group)
EC_POINT_set_compressed_coordinates_GFp(group, big_r, x, rec_id % 2, nil)
big_q = EC_POINT_new(group)
n = EC_GROUP_get_degree(group)
e = BN_bin2bn(message_hash, message_hash.bytesize, BN_new())
BN_rshift(e, e, 8 - (n & 7)) if 8 * message_hash.bytesize > n
ctx = BN_CTX_new()
zero, rr, sor, eor = BN_new(), BN_new(), BN_new(), BN_new()
BN_set_word(zero, 0)
BN_mod_sub(e, zero, e, order, ctx)
BN_mod_inverse(rr, r, order, ctx)
BN_mod_mul(sor, s, rr, order, ctx)
BN_mod_mul(eor, e, rr, order, ctx)
EC_POINT_mul(group, big_q, eor, big_r, sor, ctx)
EC_KEY_set_public_key(eckey, big_q)
BN_CTX_free(ctx)
[r, s, order, x, field, e, zero, rr, sor, eor].each{|i| BN_free(i) }
[big_r, big_q].each{|i| EC_POINT_free(i) }
length = i2o_ECPublicKey(eckey, nil)
buf = FFI::MemoryPointer.new(:uint8, length)
ptr = FFI::MemoryPointer.new(:pointer).put_pointer(0, buf)
pub_hex = if i2o_ECPublicKey(eckey, ptr) == length
buf.read_string(length).unpack("H*")[0]
end
EC_KEY_free(eckey)
pub_hex
end
# Regenerate a DER-encoded signature such that the S-value complies with the BIP62
# specification.
#
def self.signature_to_low_s(signature)
init_ffi_ssl
buf = FFI::MemoryPointer.new(:uint8, 34)
temp = signature.unpack("C*")
length_r = temp[3]
length_s = temp[5+length_r]
sig = FFI::MemoryPointer.from_string(signature)
# Calculate the lower s value
s = BN_bin2bn(sig[6 + length_r], length_s, BN_new())
eckey = EC_KEY_new_by_curve_name(NID_secp256k1)
group, order, halforder, ctx = EC_KEY_get0_group(eckey), BN_new(), BN_new(), BN_CTX_new()
EC_GROUP_get_order(group, order, ctx)
BN_rshift1(halforder, order)
if BN_cmp(s, halforder) > 0
BN_sub(s, order, s)
end
BN_free(halforder)
BN_free(order)
BN_CTX_free(ctx)
length_s = BN_bn2bin(s, buf)
# p buf.read_string(length_s).unpack("H*")
# Re-encode the signature in DER format
sig = [0x30, 0, 0x02, length_r]
sig.concat(temp.slice(4, length_r))
sig << 0x02
sig << length_s
sig.concat(buf.read_string(length_s).unpack("C*"))
sig[1] = sig.size - 2
BN_free(s)
EC_KEY_free(eckey)
sig.pack("C*")
end
def self.sign_compact(hash, private_key, public_key_hex = nil, pubkey_compressed = nil)
msg32 = FFI::MemoryPointer.new(:uchar, 32).put_bytes(0, hash)
private_key = [private_key].pack("H*") if private_key.bytesize >= 64
private_key_hex = private_key.unpack("H*")[0]
public_key_hex = regenerate_key(private_key_hex).last unless public_key_hex
pubkey_compressed = (public_key_hex[0..1] == "04" ? false : true) unless pubkey_compressed
init_ffi_ssl
eckey = EC_KEY_new_by_curve_name(NID_secp256k1)
priv_key = BN_bin2bn(private_key, private_key.bytesize, BN_new())
group, order, ctx = EC_KEY_get0_group(eckey), BN_new(), BN_CTX_new()
EC_GROUP_get_order(group, order, ctx)
pub_key = EC_POINT_new(group)
EC_POINT_mul(group, pub_key, priv_key, nil, nil, ctx)
EC_KEY_set_private_key(eckey, priv_key)
EC_KEY_set_public_key(eckey, pub_key)
signature = ECDSA_do_sign(msg32, msg32.size, eckey)
BN_free(order)
BN_CTX_free(ctx)
EC_POINT_free(pub_key)
BN_free(priv_key)
EC_KEY_free(eckey)
buf, rec_id, head = FFI::MemoryPointer.new(:uint8, 32), nil, nil
r, s = signature.get_array_of_pointer(0, 2).map{|i| BN_bn2bin(i, buf); buf.read_string(BN_num_bytes(i)).rjust(32, "\x00") }
if signature.get_array_of_pointer(0, 2).all?{|i| BN_num_bits(i) <= 256 }
4.times{|i|
head = [ 27 + i + (pubkey_compressed ? 4 : 0) ].pack("C")
if public_key_hex == recover_public_key_from_signature(msg32.read_string(32), [head, r, s].join, i, pubkey_compressed)
rec_id = i; break
end
}
end
ECDSA_SIG_free(signature)
[ head, [r,s] ].join if rec_id
end
def self.recover_compact(hash, signature)
return false if signature.bytesize != 65
msg32 = FFI::MemoryPointer.new(:uchar, 32).put_bytes(0, hash)
version = signature.unpack('C')[0]
return false if version < 27 or version > 34
compressed = (version >= 31) ? (version -= 4; true) : false
pubkey = recover_public_key_from_signature(msg32.read_string(32), signature, version-27, compressed)
end
# lifted from https://github.com/GemHQ/money-tree
def self.ec_add(point_0, point_1)
init_ffi_ssl
eckey = EC_KEY_new_by_curve_name(NID_secp256k1)
group = EC_KEY_get0_group(eckey)
point_0_hex = point_0.to_bn.to_s(16)
point_0_pt = EC_POINT_hex2point(group, point_0_hex, nil, nil)
point_1_hex = point_1.to_bn.to_s(16)
point_1_pt = EC_POINT_hex2point(group, point_1_hex, nil, nil)
sum_point = EC_POINT_new(group)
success = EC_POINT_add(group, sum_point, point_0_pt, point_1_pt, nil)
hex = EC_POINT_point2hex(group, sum_point, POINT_CONVERSION_UNCOMPRESSED, nil)
EC_KEY_free(eckey)
EC_POINT_free(sum_point)
hex
end
# repack signature for OpenSSL 1.0.1k handling of DER signatures
# https://github.com/bitcoin/bitcoin/pull/5634/files
def self.repack_der_signature(signature)
init_ffi_ssl
return false if signature.empty?
# New versions of OpenSSL will reject non-canonical DER signatures. de/re-serialize first.
norm_der = FFI::MemoryPointer.new(:pointer)
sig_ptr = FFI::MemoryPointer.new(:pointer).put_pointer(0, FFI::MemoryPointer.from_string(signature))
norm_sig = d2i_ECDSA_SIG(nil, sig_ptr, signature.bytesize)
derlen = i2d_ECDSA_SIG(norm_sig, norm_der)
ECDSA_SIG_free(norm_sig)
return false if derlen <= 0
ret = norm_der.read_pointer.read_string(derlen)
OPENSSL_free(norm_der.read_pointer)
ret
end
def self.init_ffi_ssl
return if @ssl_loaded
SSL_library_init()
ERR_load_crypto_strings()
SSL_load_error_strings()
RAND_poll()
@ssl_loaded = true
end
end
end