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Add BIP352 module (take 3) #1698

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bb2c5bf
build: add skeleton for new silentpayments (BIP352) module
theStack Sep 27, 2023
6fe3a7a
silentpayments: sending
josibake Mar 25, 2024
28917fa
silentpayments: recipient label support
theStack Jan 22, 2024
55dce8c
silentpayments: receiving
josibake Oct 2, 2025
14b1bf0
silentpayments: light client scanning
josibake Oct 2, 2025
a0b77dc
silentpayments: add examples/silentpayments.c
josibake Apr 15, 2024
9c6d949
silentpayments: add benchmarks for scanning
josibake Apr 25, 2024
e759094
tests: add BIP-352 test vectors
josibake Jul 2, 2024
568e3ae
tests: add constant time tests
josibake Nov 7, 2024
c7d3827
tests: add sha256 tag test
josibake Aug 15, 2025
29bf593
ci: enable silentpayments module
theStack Feb 22, 2024
a0d2a33
docs: update README
josibake Jul 12, 2024
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41 changes: 26 additions & 15 deletions .github/workflows/ci.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,7 @@ env:
SCHNORRSIG: 'no'
MUSIG: 'no'
ELLSWIFT: 'no'
SILENTPAYMENTS: 'no'
### test options
SECP256K1_TEST_ITERS: 64
BENCH: 'yes'
Expand Down Expand Up @@ -84,18 +85,18 @@ jobs:
matrix:
configuration:
- env_vars: { WIDEMUL: 'int64', RECOVERY: 'yes' }
- env_vars: { WIDEMUL: 'int64', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes' }
- env_vars: { WIDEMUL: 'int64', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: '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', MUSIG: 'yes', ELLSWIFT: 'yes' }
- env_vars: { WIDEMUL: 'int128', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes' }
- env_vars: { WIDEMUL: 'int128', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', SILENTPAYMENTS: 'yes' }
- env_vars: { WIDEMUL: 'int128', ASM: 'x86_64', ELLSWIFT: 'yes' }
- env_vars: { RECOVERY: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes' }
- env_vars: { CTIMETESTS: 'no', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', CPPFLAGS: '-DVERIFY' }
- env_vars: { CTIMETESTS: 'no', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: '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', MUSIG: 'yes', ELLSWIFT: 'yes' }
- env_vars: { CFLAGS: '-O1', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes' }
- env_vars: { ECMULTGENKB: 2, ECMULTWINDOW: 2 }
- env_vars: { ECMULTGENKB: 86, ECMULTWINDOW: 4 }
cc:
Expand Down Expand Up @@ -142,6 +143,7 @@ jobs:
SCHNORRSIG: 'yes'
MUSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CC: ${{ matrix.cc }}

steps:
Expand Down Expand Up @@ -174,6 +176,7 @@ jobs:
SCHNORRSIG: 'yes'
MUSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CTIMETESTS: 'no'

steps:
Expand Down Expand Up @@ -214,6 +217,7 @@ jobs:
SCHNORRSIG: 'yes'
MUSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CTIMETESTS: 'no'

steps:
Expand Down Expand Up @@ -245,6 +249,7 @@ jobs:
SCHNORRSIG: 'yes'
MUSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CTIMETESTS: 'no'
CC: ${{ matrix.cc }}

Expand Down Expand Up @@ -287,6 +292,7 @@ jobs:
SCHNORRSIG: 'yes'
MUSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CTIMETESTS: 'no'

steps:
Expand Down Expand Up @@ -348,6 +354,7 @@ jobs:
SCHNORRSIG: 'yes'
MUSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CTIMETESTS: 'no'
SECP256K1_TEST_ITERS: 2

Expand Down Expand Up @@ -387,6 +394,7 @@ jobs:
SCHNORRSIG: 'yes'
MUSIG: '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 @@ -440,6 +448,7 @@ jobs:
SCHNORRSIG: 'yes'
MUSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CC: 'clang'
SECP256K1_TEST_ITERS: 32
ASM: 'no'
Expand Down Expand Up @@ -476,6 +485,7 @@ jobs:
SCHNORRSIG: 'yes'
MUSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'
CTIMETESTS: 'no'

strategy:
Expand Down Expand Up @@ -519,14 +529,14 @@ jobs:
fail-fast: false
matrix:
env_vars:
- { WIDEMUL: 'int64', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes' }
- { WIDEMUL: 'int64', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes' }
- { WIDEMUL: 'int128_struct', ECMULTGENKB: 2, ECMULTWINDOW: 4 }
- { WIDEMUL: 'int128', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes' }
- { WIDEMUL: 'int128', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes' }
- { WIDEMUL: 'int128', RECOVERY: 'yes' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes', CC: 'gcc' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes', WRAPPER_CMD: 'valgrind --error-exitcode=42', SECP256K1_TEST_ITERS: 2 }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: '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', MUSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes', CC: 'gcc' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: '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', MUSIG: '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', MUSIG: 'yes', ELLSWIFT: 'yes', CPPFLAGS: '-DVERIFY', CTIMETESTS: 'no' }
- BUILD: 'distcheck'

Expand Down Expand Up @@ -573,13 +583,13 @@ jobs:
fail-fast: false
matrix:
env_vars:
- { WIDEMUL: 'int64', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes' }
- { WIDEMUL: 'int64', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes' }
- { WIDEMUL: 'int128_struct', ECMULTGENPRECISION: 2, ECMULTWINDOW: 4 }
- { WIDEMUL: 'int128', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes' }
- { WIDEMUL: 'int128', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes' }
- { WIDEMUL: 'int128', RECOVERY: 'yes' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes', CC: 'gcc' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes', CPPFLAGS: '-DVERIFY' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes', CC: 'gcc' }
- { WIDEMUL: 'int128', RECOVERY: 'yes', ECDH: 'yes', EXTRAKEYS: 'yes', SCHNORRSIG: 'yes', MUSIG: 'yes', ELLSWIFT: 'yes', SILENTPAYMENTS: 'yes', CPPFLAGS: '-DVERIFY' }
- BUILD: 'distcheck'

steps:
Expand Down Expand Up @@ -705,6 +715,7 @@ jobs:
SCHNORRSIG: 'yes'
MUSIG: 'yes'
ELLSWIFT: 'yes'
SILENTPAYMENTS: 'yes'

steps:
- name: Checkout
Expand Down
1 change: 1 addition & 0 deletions .gitignore
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Expand Up @@ -12,6 +12,7 @@ ecdsa_example
schnorr_example
ellswift_example
musig_example
silentpayments_example
*.exe
*.so
*.a
Expand Down
2 changes: 2 additions & 0 deletions CMakeLists.txt
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Expand Up @@ -52,6 +52,7 @@ option(SECP256K1_ENABLE_MODULE_EXTRAKEYS "Enable extrakeys module." ON)
option(SECP256K1_ENABLE_MODULE_SCHNORRSIG "Enable schnorrsig module." ON)
option(SECP256K1_ENABLE_MODULE_MUSIG "Enable musig module." ON)
option(SECP256K1_ENABLE_MODULE_ELLSWIFT "Enable ElligatorSwift module." ON)
option(SECP256K1_ENABLE_MODULE_SILENTPAYMENTS "Enable Silent Payments module." ON)

option(SECP256K1_USE_EXTERNAL_DEFAULT_CALLBACKS "Enable external default callback functions." OFF)
if(SECP256K1_USE_EXTERNAL_DEFAULT_CALLBACKS)
Expand Down Expand Up @@ -285,6 +286,7 @@ message(" extrakeys ........................... ${SECP256K1_ENABLE_MODULE_EXTRA
message(" schnorrsig .......................... ${SECP256K1_ENABLE_MODULE_SCHNORRSIG}")
message(" musig ............................... ${SECP256K1_ENABLE_MODULE_MUSIG}")
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 ............... ${SECP256K1_ECMULT_GEN_KB} KiB")
Expand Down
24 changes: 24 additions & 0 deletions Makefile.am
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Original file line number Diff line number Diff line change
Expand Up @@ -207,6 +207,17 @@ musig_example_LDFLAGS += -lbcrypt
endif
TESTS += musig_example
endif
if ENABLE_MODULE_SILENTPAYMENTS
noinst_PROGRAMS += silentpayments_example
silentpayments_example_SOURCES = examples/silentpayments.c
silentpayments_example_CPPFLAGS = -I$(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 @@ -249,6 +260,11 @@ 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
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60f209c: we could wrap this in if ENABLE_MODULE_SILENTPAYMENTS as well. (similar to ECDH test vectors)


if ENABLE_MODULE_SILENTPAYMENTS
TESTVECTORS += src/modules/silentpayments/vectors.h
endif

if ENABLE_MODULE_ECDH
TESTVECTORS += src/wycheproof/ecdh_secp256k1_test.h
Expand All @@ -262,6 +278,10 @@ src/wycheproof/ecdh_secp256k1_test.h:
mkdir -p $(@D)
python3 $(top_srcdir)/tools/tests_wycheproof_generate_ecdh.py $(top_srcdir)/src/wycheproof/ecdh_secp256k1_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 @@ -311,3 +331,7 @@ 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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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ Features:
* 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 MuSig2 Schnorr multi-signatures according to [BIP-327](https://github.com/bitcoin/bips/blob/master/bip-0327.mediawiki).
* Optional module for Silent Payments sending and receiving according to [BIP-352](https://github.com/bitcoin/bips/blob/master/bip-0352.mediawiki).

Implementation details
----------------------
Expand Down Expand Up @@ -150,6 +151,7 @@ Usage examples can be found in the [examples](examples) directory. To compile th
* [Deriving a shared secret (ECDH) example](examples/ecdh.c)
* [ElligatorSwift key exchange example](examples/ellswift.c)
* [MuSig2 Schnorr multi-signatures example](examples/musig.c)
* [Silent Payments send and receive example](examples/silentpayments.c)

To compile the examples, make sure the corresponding modules are enabled.

Expand Down
3 changes: 2 additions & 1 deletion ci/ci.sh
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Original file line number Diff line number Diff line change
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 MUSIG SCHNORRSIG ELLSWIFT \
EXPERIMENTAL ECDH RECOVERY EXTRAKEYS MUSIG SCHNORRSIG ELLSWIFT SILENTPAYMENTS \
SECP256K1_TEST_ITERS BENCH SECP256K1_BENCH_ITERS CTIMETESTS SYMBOL_CHECK \
EXAMPLES \
HOST WRAPPER_CMD \
Expand Down Expand Up @@ -80,6 +80,7 @@ esac
--enable-module-extrakeys="$EXTRAKEYS" \
--enable-module-schnorrsig="$SCHNORRSIG" \
--enable-module-musig="$MUSIG" \
--enable-module-silentpayments="$SILENTPAYMENTS" \
--enable-examples="$EXAMPLES" \
--enable-ctime-tests="$CTIMETESTS" \
--with-valgrind="$WITH_VALGRIND" \
Expand Down
14 changes: 14 additions & 0 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -191,6 +191,10 @@ 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=yes]]), [],
[SECP_SET_DEFAULT([enable_module_silentpayments], [yes], [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 @@ -397,6 +401,14 @@ 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
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 @@ -462,6 +474,7 @@ AM_CONDITIONAL([ENABLE_MODULE_EXTRAKEYS], [test x"$enable_module_extrakeys" = x"
AM_CONDITIONAL([ENABLE_MODULE_SCHNORRSIG], [test x"$enable_module_schnorrsig" = x"yes"])
AM_CONDITIONAL([ENABLE_MODULE_MUSIG], [test x"$enable_module_musig" = x"yes"])
AM_CONDITIONAL([ENABLE_MODULE_ELLSWIFT], [test x"$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 @@ -486,6 +499,7 @@ echo " module extrakeys = $enable_module_extrakeys"
echo " module schnorrsig = $enable_module_schnorrsig"
echo " module musig = $enable_module_musig"
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
4 changes: 4 additions & 0 deletions examples/CMakeLists.txt
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Expand Up @@ -29,3 +29,7 @@ endif()
if(SECP256K1_ENABLE_MODULE_MUSIG)
add_example(musig)
endif()

if(SECP256K1_ENABLE_MODULE_SILENTPAYMENTS)
add_example(silentpayments)
endif()
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