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Add BIP352 silentpayments module #1519

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Add BIP352 silentpayments module #1519

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1c74941
build: add skeleton for new silentpayments (BIP352) module
theStack Sep 27, 2023
9d6769f
silentpayments: sending
josibake Mar 25, 2024
7229d49
silentpayments: recipient label support
theStack Jan 22, 2024
94c6e1f
silentpayments: receiving
josibake Jun 29, 2024
5c546e2
silentpayments: add examples/silentpayments.c
josibake Apr 15, 2024
566b5b8
silentpayments: add benchmarks for scanning
josibake Apr 25, 2024
5ce0db1
tests: add BIP-352 test vectors
josibake Jul 2, 2024
5b9714f
ci: enable silentpayments module
theStack Feb 22, 2024
f42e0dd
docs: update README
josibake Jul 12, 2024
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3 changes: 3 additions & 0 deletions .cirrus.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@ env:
EXTRAKEYS: no
SCHNORRSIG: no
ELLSWIFT: no
SILENTPAYMENTS: no
### test options
SECP256K1_TEST_ITERS:
BENCH: yes
Expand Down Expand Up @@ -70,6 +71,7 @@ task:
EXTRAKEYS: yes
SCHNORRSIG: yes
ELLSWIFT: yes
SILENTPAYMENTS: yes
matrix:
# Currently only gcc-snapshot, the other compilers are tested on GHA with QEMU
- env: { CC: 'gcc-snapshot' }
Expand All @@ -87,6 +89,7 @@ task:
EXTRAKEYS: yes
SCHNORRSIG: yes
ELLSWIFT: yes
SILENTPAYMENTS: yes
WRAPPER_CMD: 'valgrind --error-exitcode=42'
SECP256K1_TEST_ITERS: 2
matrix:
Expand Down
31 changes: 21 additions & 10 deletions .github/workflows/ci.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,7 @@ env:
EXTRAKEYS: 'no'
SCHNORRSIG: 'no'
ELLSWIFT: 'no'
SILENTPAYMENTS: 'no'
### test options
SECP256K1_TEST_ITERS:
BENCH: 'yes'
Expand Down Expand Up @@ -72,18 +73,18 @@ jobs:
matrix:
configuration:
- env_vars: { WIDEMUL: 'int64', RECOVERY: 'yes' }
- env_vars: { WIDEMUL: 'int64', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes' }
- env_vars: { WIDEMUL: 'int64', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes' }
- env_vars: { WIDEMUL: 'int128' }
- env_vars: { WIDEMUL: 'int128_struct', ELLSWIFT: 'yes' }
- env_vars: { WIDEMUL: 'int128', RECOVERY: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes' }
- env_vars: { WIDEMUL: 'int128', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes' }
- env_vars: { WIDEMUL: 'int128', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', SILENTPAYMENTS: 'yes' }
- env_vars: { WIDEMUL: 'int128', ASM: 'x86_64', ELLSWIFT: 'yes' }
- env_vars: { RECOVERY: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes' }
- env_vars: { CTIMETESTS: 'no', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', CPPFLAGS: '-DVERIFY' }
- env_vars: { CTIMETESTS: 'no', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', SILENTPAYMENTS: 'yes', CPPFLAGS: '-DVERIFY' }
- env_vars: { BUILD: 'distcheck', WITH_VALGRIND: 'no', CTIMETESTS: 'no', BENCH: 'no' }
- env_vars: { CPPFLAGS: '-DDETERMINISTIC' }
- env_vars: { CFLAGS: '-O0', CTIMETESTS: 'no' }
- env_vars: { CFLAGS: '-O1', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes' }
- env_vars: { CFLAGS: '-O1', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes' }
- env_vars: { ECMULTGENKB: 2, ECMULTWINDOW: 2 }
- env_vars: { ECMULTGENKB: 86, ECMULTWINDOW: 4 }
cc:
Expand Down Expand Up @@ -143,6 +144,7 @@ jobs:
EXTRAKEYS: 'yes'
SCHNORRSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CC: ${{ matrix.cc }}

steps:
Expand Down Expand Up @@ -188,6 +190,7 @@ jobs:
EXTRAKEYS: 'yes'
SCHNORRSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CTIMETESTS: 'no'

steps:
Expand Down Expand Up @@ -240,6 +243,7 @@ jobs:
EXTRAKEYS: 'yes'
SCHNORRSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CTIMETESTS: 'no'

steps:
Expand Down Expand Up @@ -286,6 +290,7 @@ jobs:
EXTRAKEYS: 'yes'
SCHNORRSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CTIMETESTS: 'no'

strategy:
Expand Down Expand Up @@ -342,6 +347,7 @@ jobs:
EXTRAKEYS: 'yes'
SCHNORRSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CTIMETESTS: 'no'

steps:
Expand Down Expand Up @@ -395,6 +401,7 @@ jobs:
EXTRAKEYS: 'yes'
SCHNORRSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CTIMETESTS: 'no'
SECP256K1_TEST_ITERS: 2

Expand Down Expand Up @@ -447,6 +454,7 @@ jobs:
EXTRAKEYS: 'yes'
SCHNORRSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CTIMETESTS: 'no'
CFLAGS: '-fsanitize=undefined,address -g'
UBSAN_OPTIONS: 'print_stacktrace=1:halt_on_error=1'
Expand Down Expand Up @@ -512,6 +520,7 @@ jobs:
EXTRAKEYS: 'yes'
SCHNORRSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CC: 'clang'
SECP256K1_TEST_ITERS: 32
ASM: 'no'
Expand Down Expand Up @@ -559,6 +568,7 @@ jobs:
EXTRAKEYS: 'yes'
SCHNORRSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CTIMETESTS: 'no'

strategy:
Expand Down Expand Up @@ -615,14 +625,14 @@ jobs:
fail-fast: false
matrix:
env_vars:
- { WIDEMUL: 'int64', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes' }
- { WIDEMUL: 'int64', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes' }
- { WIDEMUL: 'int128_struct', ECMULTGENKB: 2, ECMULTWINDOW: 4 }
- { WIDEMUL: 'int128', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes' }
- { WIDEMUL: 'int128', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes' }
- { WIDEMUL: 'int128', RECOVERY: 'yes' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes', CC: 'gcc' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes', WRAPPER_CMD: 'valgrind --error-exitcode=42', SECP256K1_TEST_ITERS: 2 }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes', CC: 'gcc', WRAPPER_CMD: 'valgrind --error-exitcode=42', SECP256K1_TEST_ITERS: 2 }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes', CC: 'gcc' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes', WRAPPER_CMD: 'valgrind --error-exitcode=42', SECP256K1_TEST_ITERS: 2 }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes', CC: 'gcc', WRAPPER_CMD: 'valgrind --error-exitcode=42', SECP256K1_TEST_ITERS: 2 }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', ELLSWIFT: 'yes', CPPFLAGS: '-DVERIFY', CTIMETESTS: 'no' }
- BUILD: 'distcheck'

Expand Down Expand Up @@ -791,6 +801,7 @@ jobs:
EXTRAKEYS: 'yes'
SCHNORRSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'

steps:
- name: Checkout
Expand Down
1 change: 1 addition & 0 deletions .gitignore
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Expand Up @@ -11,6 +11,7 @@ ecdh_example
ecdsa_example
schnorr_example
ellswift_example
silentpayments_example
*.exe
*.so
*.a
Expand Down
6 changes: 6 additions & 0 deletions CMakeLists.txt
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Expand Up @@ -52,9 +52,14 @@ option(SECP256K1_ENABLE_MODULE_RECOVERY "Enable ECDSA pubkey recovery module." O
option(SECP256K1_ENABLE_MODULE_EXTRAKEYS "Enable extrakeys module." ON)
option(SECP256K1_ENABLE_MODULE_SCHNORRSIG "Enable schnorrsig module." ON)
option(SECP256K1_ENABLE_MODULE_ELLSWIFT "Enable ElligatorSwift module." ON)
option(SECP256K1_ENABLE_MODULE_SILENTPAYMENTS "Enable Silent Payments module." OFF)
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1c74941: since the next commit adds a dependency on extrakeys, and silent payments obviously depends on schnorr:

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8b450bf..f036a3f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -55,10 +55,17 @@ option(SECP256K1_ENABLE_MODULE_ELLSWIFT "Enable ElligatorSwift module." ON)
 option(SECP256K1_ENABLE_MODULE_SILENTPAYMENTS "Enable Silent Payments module." OFF)
 
 # Processing must be done in a topological sorting of the dependency graph
 # (dependent module first).
 if(SECP256K1_ENABLE_MODULE_SILENTPAYMENTS)
+  if(DEFINED SECP256K1_ENABLE_MODULE_SCHNORRSIG AND NOT SECP256K1_ENABLE_MODULE_SCHNORRSIG)
+    message(FATAL_ERROR "Module dependency error: You have disabled the schnorrsig module explicitly, but it is required by the silentpayments module.")
+  endif()
+  if(DEFINED SECP256K1_ENABLE_MODULE_EXTRAKEYS AND NOT SECP256K1_ENABLE_MODULE_EXTRAKEYS)
+    message(FATAL_ERROR "Module dependency error: You have disabled the extrakeys module explicitly, but it is required by the silentpayments module.")
+  endif()
+  set(SECP256K1_ENABLE_MODULE_EXTRAKEYS ON)
   add_compile_definitions(ENABLE_MODULE_SILENTPAYMENTS=1)
 endif()
 
 if(SECP256K1_ENABLE_MODULE_ELLSWIFT)
   add_compile_definitions(ENABLE_MODULE_ELLSWIFT=1)
diff --git a/configure.ac b/configure.ac
index fe778b1..da6f707 100644
--- a/configure.ac
+++ b/configure.ac
@@ -397,10 +397,20 @@ SECP_CFLAGS="$SECP_CFLAGS $WERROR_CFLAGS"
 ###
 
 # Processing must be done in a reverse topological sorting of the dependency graph
 # (dependent module first).
 if test x"$enable_module_silentpayments" = x"yes"; then
+  if test x"$enable_module_schnorrsig" = x"no"; then
+    AC_MSG_ERROR([Module dependency error: You have disabled the schnorrsig module explicitly, but it is required by the silentpayments module.])
+  fi
+  enable_module_schnorrsig=yes
+
+  if test x"$enable_module_extrakeys" = x"no"; then
+    AC_MSG_ERROR([Module dependency error: You have disabled the extrakeys module explicitly, but it is required by the silentpayments module.])
+  fi
+  enable_module_extrakeys=yes
+
   SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DENABLE_MODULE_SILENTPAYMENTS=1"
 fi
 
 if test x"$enable_module_ellswift" = x"yes"; then
   SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DENABLE_MODULE_ELLSWIFT=1"

extrakeys already checks for schnorr, but I added it an explicit check for schnorr because otherwise the error is confusing.

Try with:

  • ./configure --enable-module-silentpayments --disable-module-extrakeys
  • cmake .. -DSECP256K1_ENABLE_MODULE_SILENTPAYMENTS=ON -DSECP256K1_ENABLE_MODULE_SCHNORRSIG=OFF
  • etc


# Processing must be done in a topological sorting of the dependency graph
# (dependent module first).
if(SECP256K1_ENABLE_MODULE_SILENTPAYMENTS)
add_compile_definitions(ENABLE_MODULE_SILENTPAYMENTS=1)
endif()

if(SECP256K1_ENABLE_MODULE_ELLSWIFT)
add_compile_definitions(ENABLE_MODULE_ELLSWIFT=1)
endif()
Expand Down Expand Up @@ -298,6 +303,7 @@ message(" ECDSA pubkey recovery ............... ${SECP256K1_ENABLE_MODULE_RECOV
message(" extrakeys ........................... ${SECP256K1_ENABLE_MODULE_EXTRAKEYS}")
message(" schnorrsig .......................... ${SECP256K1_ENABLE_MODULE_SCHNORRSIG}")
message(" ElligatorSwift ...................... ${SECP256K1_ENABLE_MODULE_ELLSWIFT}")
message(" Silent Payments ..................... ${SECP256K1_ENABLE_MODULE_SILENTPAYMENTS}")
message("Parameters:")
message(" ecmult window size .................. ${SECP256K1_ECMULT_WINDOW_SIZE}")
message(" ecmult gen table size ............... ${SECP256K1_ECMULT_GEN_KB} KiB")
Expand Down
20 changes: 20 additions & 0 deletions Makefile.am
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Expand Up @@ -195,6 +195,17 @@ ellswift_example_LDFLAGS += -lbcrypt
endif
TESTS += ellswift_example
endif
if ENABLE_MODULE_SILENTPAYMENTS
noinst_PROGRAMS += silentpayments_example
silentpayments_example_SOURCES = examples/silentpayments.c
silentpayments_example_CPPFLAGS = -I$(top_srcdir)/include -DSECP256K1_STATIC
silentpayments_example_LDADD = libsecp256k1.la
silentpayments_example_LDFLAGS = -static
if BUILD_WINDOWS
silentpayments_example_LDFLAGS += -lbcrypt
endif
TESTS += silentpayments_example
endif
endif

### Precomputed tables
Expand Down Expand Up @@ -237,11 +248,16 @@ maintainer-clean-local: clean-precomp
### Pregenerated test vectors
### (see the comments in the previous section for detailed rationale)
TESTVECTORS = src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.h
TESTVECTORS += src/modules/silentpayments/vectors.h

src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.h:
mkdir -p $(@D)
python3 $(top_srcdir)/tools/tests_wycheproof_generate.py $(top_srcdir)/src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.json > $@

src/modules/silentpayments/vectors.h:
mkdir -p $(@D)
python3 $(top_srcdir)/tools/tests_silentpayments_generate.py $(top_srcdir)/src/modules/silentpayments/bip352_send_and_receive_test_vectors.json > $@

testvectors: $(TESTVECTORS)

BUILT_SOURCES += $(TESTVECTORS)
Expand Down Expand Up @@ -284,3 +300,7 @@ endif
if ENABLE_MODULE_ELLSWIFT
include src/modules/ellswift/Makefile.am.include
endif

if ENABLE_MODULE_SILENTPAYMENTS
include src/modules/silentpayments/Makefile.am.include
endif
2 changes: 2 additions & 0 deletions README.md
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Expand Up @@ -21,6 +21,7 @@ Features:
* Optional module for ECDH key exchange.
* Optional module for Schnorr signatures according to [BIP-340](https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki).
* Optional module for ElligatorSwift key exchange according to [BIP-324](https://github.com/bitcoin/bips/blob/master/bip-0324.mediawiki).
* Optional module for Silent Payments send and receive according to [BIP-352](https://github.com/bitcoin/bips/blob/master/bip-0352.mediawiki).

Implementation details
----------------------
Expand Down Expand Up @@ -115,6 +116,7 @@ Usage examples can be found in the [examples](examples) directory. To compile th
* [Schnorr signatures example](examples/schnorr.c)
* [Deriving a shared secret (ECDH) example](examples/ecdh.c)
* [ElligatorSwift key exchange example](examples/ellswift.c)
* [Silent Payments send and receive example](examples/silentpayments.c)

To compile the Schnorr signature and ECDH examples, you also need to configure with `--enable-module-schnorrsig` and `--enable-module-ecdh`.

Expand Down
3 changes: 2 additions & 1 deletion ci/ci.sh
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Expand Up @@ -13,7 +13,7 @@ print_environment() {
# does not rely on bash.
for var in WERROR_CFLAGS MAKEFLAGS BUILD \
ECMULTWINDOW ECMULTGENKB ASM WIDEMUL WITH_VALGRIND EXTRAFLAGS \
EXPERIMENTAL ECDH RECOVERY EXTRAKEYS SCHNORRSIG ELLSWIFT \
EXPERIMENTAL ECDH RECOVERY EXTRAKEYS SCHNORRSIG ELLSWIFT SILENTPAYMENTS \
SECP256K1_TEST_ITERS BENCH SECP256K1_BENCH_ITERS CTIMETESTS\
EXAMPLES \
HOST WRAPPER_CMD \
Expand Down Expand Up @@ -79,6 +79,7 @@ esac
--enable-module-ellswift="$ELLSWIFT" \
--enable-module-extrakeys="$EXTRAKEYS" \
--enable-module-schnorrsig="$SCHNORRSIG" \
--enable-module-silentpayments="$SILENTPAYMENTS" \
--enable-examples="$EXAMPLES" \
--enable-ctime-tests="$CTIMETESTS" \
--with-valgrind="$WITH_VALGRIND" \
Expand Down
10 changes: 10 additions & 0 deletions configure.ac
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Expand Up @@ -188,6 +188,10 @@ AC_ARG_ENABLE(module_ellswift,
AS_HELP_STRING([--enable-module-ellswift],[enable ElligatorSwift module [default=yes]]), [],
[SECP_SET_DEFAULT([enable_module_ellswift], [yes], [yes])])

AC_ARG_ENABLE(module_silentpayments,
AS_HELP_STRING([--enable-module-silentpayments],[enable Silent Payments module [default=no]]), [],
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1c74941: can we just break the convention and make it --enable-module-silent-payments? :-)

[SECP_SET_DEFAULT([enable_module_silentpayments], [no], [yes])])

AC_ARG_ENABLE(external_default_callbacks,
AS_HELP_STRING([--enable-external-default-callbacks],[enable external default callback functions [default=no]]), [],
[SECP_SET_DEFAULT([enable_external_default_callbacks], [no], [no])])
Expand Down Expand Up @@ -394,6 +398,10 @@ SECP_CFLAGS="$SECP_CFLAGS $WERROR_CFLAGS"

# Processing must be done in a reverse topological sorting of the dependency graph
# (dependent module first).
if test x"$enable_module_silentpayments" = x"yes"; then
SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DENABLE_MODULE_SILENTPAYMENTS=1"
fi

if test x"$enable_module_ellswift" = x"yes"; then
SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DENABLE_MODULE_ELLSWIFT=1"
fi
Expand Down Expand Up @@ -450,6 +458,7 @@ AM_CONDITIONAL([ENABLE_MODULE_RECOVERY], [test x"$enable_module_recovery" = x"ye
AM_CONDITIONAL([ENABLE_MODULE_EXTRAKEYS], [test x"$enable_module_extrakeys" = x"yes"])
AM_CONDITIONAL([ENABLE_MODULE_SCHNORRSIG], [test x"$enable_module_schnorrsig" = x"yes"])
AM_CONDITIONAL([ENABLE_MODULE_ELLSWIFT], [test x"$enable_module_ellswift" = x"yes"])
AM_CONDITIONAL([ENABLE_MODULE_SILENTPAYMENTS], [test x"$enable_module_silentpayments" = x"yes"])
AM_CONDITIONAL([USE_EXTERNAL_ASM], [test x"$enable_external_asm" = x"yes"])
AM_CONDITIONAL([USE_ASM_ARM], [test x"$set_asm" = x"arm32"])
AM_CONDITIONAL([BUILD_WINDOWS], [test "$build_windows" = "yes"])
Expand All @@ -472,6 +481,7 @@ echo " module recovery = $enable_module_recovery"
echo " module extrakeys = $enable_module_extrakeys"
echo " module schnorrsig = $enable_module_schnorrsig"
echo " module ellswift = $enable_module_ellswift"
echo " module silentpayments = $enable_module_silentpayments"
echo
echo " asm = $set_asm"
echo " ecmult window size = $set_ecmult_window"
Expand Down
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