diff --git a/tests/suites/test_suite_ecp.data b/tests/suites/test_suite_ecp.data
index bf8e9e9..d08ce0f 100644
--- a/tests/suites/test_suite_ecp.data
+++ b/tests/suites/test_suite_ecp.data
@@ -1239,6 +1239,12 @@
 # initialised with seed(2,2) and random.getrandbits(curve bits). Curve bits are 192,256,384,520.
 # They must be less than the named curves' modulus. mbedtls_mpi_mod_residue_setup()
 # can be used to check whether they satisfy the requirements.
+
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #1.0 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP192R1)
+depends_on:MBEDTLS_ECP_DP_SECP192R1_ENABLED
+ecp_mod_add_sub:"ffffffffffffffffffffffff99def836146bc9b1b4d22830":"ffffffffffffffffffffffff99def836146bc9b1b4d2282f":MBEDTLS_ECP_DP_SECP192R1:MBEDTLS_ECP_MOD_SCALAR
+
 ecp_add_sub #1 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP192R1)
 depends_on:MBEDTLS_ECP_DP_SECP192R1_ENABLED
 ecp_mod_add_sub:"177219d30e7a269fd95bafc8f2a4d27bdcf4bb99f4bea973":"cf1822ffbc6887782b491044d5e341245c6e433715ba2bdd":MBEDTLS_ECP_DP_SECP192R1:MBEDTLS_ECP_MOD_SCALAR
@@ -1251,6 +1257,11 @@
 depends_on:MBEDTLS_ECP_DP_SECP192R1_ENABLED
 ecp_mod_add_sub:"dc38f519b91751dacdbd47d364be8049a372db8f6e405d93":"ef8acd128b4f2fc15f3f57ebf30b94fa82523e86feac7eb7":MBEDTLS_ECP_DP_SECP192R1:MBEDTLS_ECP_MOD_SCALAR
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #4.0 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP224R1)
+depends_on:MBEDTLS_ECP_DP_SECP224R1_ENABLED
+ecp_mod_add_sub:"ffffffffffffffffffffffffffff16a2e0b8f03e13dd29455c5c2a3c":"ffffffffffffffffffffffffffff16a2e0b8f03e13dd29455c5c2a3b":MBEDTLS_ECP_DP_SECP224R1:MBEDTLS_ECP_MOD_SCALAR
+
 ecp_add_sub #4 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP224R1)
 depends_on:MBEDTLS_ECP_DP_SECP224R1_ENABLED
 ecp_mod_add_sub:"706a045defc044a09325626e6b58de744ab6cce80877b6f71e1f6d2":"6c71c4a66148a86fe8624fab5186ee32ee8d7ee9770348a05d300cb9":MBEDTLS_ECP_DP_SECP224R1:MBEDTLS_ECP_MOD_SCALAR
@@ -1263,6 +1274,11 @@
 depends_on:MBEDTLS_ECP_DP_SECP224R1_ENABLED
 ecp_mod_add_sub:"2e8d4b8a8f54f8ceacaab39e83844b40ffa9b9f15c14bc4a829e07b0":"867e5e15bc01bfce6a27e0dfcbf8754472154e76e4c11ab2fec3f6b3":MBEDTLS_ECP_DP_SECP224R1:MBEDTLS_ECP_MOD_SCALAR
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #7.0 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP256R1)
+depends_on:MBEDTLS_ECP_DP_SECP256R1_ENABLED
+ecp_mod_add_sub:"ffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632550":"ffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc63254f":MBEDTLS_ECP_DP_SECP256R1:MBEDTLS_ECP_MOD_SCALAR
+
 ecp_add_sub #7 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP256R1)
 depends_on:MBEDTLS_ECP_DP_SECP256R1_ENABLED
 ecp_mod_add_sub:"5ca495fa5a91c89b97eeab64ca2ce6bc5d3fd983c34c769fe89204e2e8168561":"665d7435c1066932f4767f26294365b2721dea3bf63f23d0dbe53fcafb2147df":MBEDTLS_ECP_DP_SECP256R1:MBEDTLS_ECP_MOD_SCALAR
@@ -1275,6 +1291,11 @@
 depends_on:MBEDTLS_ECP_DP_SECP256R1_ENABLED
 ecp_mod_add_sub:"b9d39cca91551e8259cc60b17604e4b4e73695c3e652c71a74667bffe202849d":"f0caeef038c89b38a8acb5137c9260dc74e088a9b9492f258ebdbfe3eb9ac688":MBEDTLS_ECP_DP_SECP256R1:MBEDTLS_ECP_MOD_SCALAR
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #10.0 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP384R1)
+depends_on:MBEDTLS_ECP_DP_SECP384R1_ENABLED
+ecp_mod_add_sub:"ffffffffffffffffffffffffffffffffffffffffffffffffc7634d81f4372ddf581a0db248b0a77aecec196accc52972":"ffffffffffffffffffffffffffffffffffffffffffffffffc7634d81f4372ddf581a0db248b0a77aecec196accc52971":MBEDTLS_ECP_DP_SECP384R1:MBEDTLS_ECP_MOD_SCALAR
+
 ecp_add_sub #10 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP384R1)
 depends_on:MBEDTLS_ECP_DP_SECP384R1_ENABLED
 ecp_mod_add_sub:"7ad1f45ae9500ec9c5e2486c44a4a8f69dc8db48e86ec9c6e06f291b2a838af8d5c44a4eb3172062d08f1bb2531d6460":"9da59b74a6c3181c81e220df848b1df78feb994a81167346d4c0dca8b4c9e755cc9c3adcf515a8234da4daeb4f3f8777":MBEDTLS_ECP_DP_SECP384R1:MBEDTLS_ECP_MOD_SCALAR
@@ -1287,6 +1308,11 @@
 depends_on:MBEDTLS_ECP_DP_SECP384R1_ENABLED
 ecp_mod_add_sub:"c11e60de1b343f52ea748db9e020307aaeb6db2c3a038a709779ac1f45e9dd320c855fdfa7251af0930cdbd30f0ad2a8":"e5e138e26c4454b90f756132e16dce72f18e859835e1f291d322a7353ead4efe440e2b4fda9c025a22f1a83185b98f5f":MBEDTLS_ECP_DP_SECP384R1:MBEDTLS_ECP_MOD_SCALAR
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #13.0 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP521R1)
+depends_on:MBEDTLS_ECP_DP_SECP521R1_ENABLED
+ecp_mod_add_sub:"01fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffa51868783bf2f966b7fcc0148f709a5d03bb5c9b8899c47aebb6fb71e91386408":"01fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffa51868783bf2f966b7fcc0148f709a5d03bb5c9b8899c47aebb6fb71e91386407":MBEDTLS_ECP_DP_SECP521R1:MBEDTLS_ECP_MOD_SCALAR
+
 ecp_add_sub #13 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP521R1)
 depends_on:MBEDTLS_ECP_DP_SECP521R1_ENABLED
 ecp_mod_add_sub:"1ba0a76c196067cfdcb11457d9cf45e2fa01d7f4275153924800600571fac3a5b263fdf57cd2c0064975c3747465cc36c270e8a35b10828d569c268a20eb78ac332":"1cb0b0c995e96e6bc4d62b47204007ee4fab105d83e85e951862f0981aebc1b00d92838e766ef9b6bf2d037fe2e20b6a8464174e75a5f834da70569c018eb2b5693":MBEDTLS_ECP_DP_SECP521R1:MBEDTLS_ECP_MOD_SCALAR
@@ -1299,6 +1325,11 @@
 depends_on:MBEDTLS_ECP_DP_SECP521R1_ENABLED
 ecp_mod_add_sub:"164c7f3860895bfa81384ae65e920a63ac1f2b64df6dff07870c9d531ae72a47403063238da1a1fe3f9d6a179fa50f96cd4aff9261aa92c0e6f17ec940639bc2ccd":"1f58ed5d1b7b310b730049dd332a73fa0b26b75196cf87eb8a09b27ec714307c68c425424a1574f1eedf5b0f16cdfdb839424d201e653f53d6883ca1c107ca6e706":MBEDTLS_ECP_DP_SECP521R1:MBEDTLS_ECP_MOD_SCALAR
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #16.0 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_BP256R1)
+depends_on:MBEDTLS_ECP_DP_BP256R1_ENABLED
+ecp_mod_add_sub:"a9fb57dba1eea9bc3e660a909d838d726e3bf623d52620282013481d1f6e5376":"a9fb57dba1eea9bc3e660a909d838d726e3bf623d52620282013481d1f6e5375":MBEDTLS_ECP_DP_BP256R1:MBEDTLS_ECP_MOD_COORDINATE
+
 # The following data was generated using python's standard random library,
 # initialised with seed(3,2) and random.getrandbits(curve bits). Curve bits are 256,384,512.
 ecp_add_sub #16 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_BP256R1)
@@ -1313,6 +1344,11 @@
 depends_on:MBEDTLS_ECP_DP_BP256R1_ENABLED
 ecp_mod_add_sub:"3e0a813bdc2ae9963d2e49085ef3430ed038db4de38378426d0b944a2863a7f":"af438d297524d6af51e8722c21b609228ce6f2410645d51c6f8da3eabe19f58":MBEDTLS_ECP_DP_BP256R1:MBEDTLS_ECP_MOD_COORDINATE
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #19.0 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_BP256R1)
+depends_on:MBEDTLS_ECP_DP_BP256R1_ENABLED
+ecp_mod_add_sub:"a9fb57dba1eea9bc3e660a909d838d718c397aa3b561a6f7901e0e82974856a6":"a9fb57dba1eea9bc3e660a909d838d718c397aa3b561a6f7901e0e82974856a5":MBEDTLS_ECP_DP_BP256R1:MBEDTLS_ECP_MOD_COORDINATE
+
 ecp_add_sub #19 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_BP256R1)
 depends_on:MBEDTLS_ECP_DP_BP256R1_ENABLED
 ecp_mod_add_sub:"984181177906159644f9794cdd933160d2d5844307f062cec7b317d94d1fe09f":"6d4b9adbebcd1f5ec9c18070b6d13089633a50eee0f9e038eb8f624fb804d820":MBEDTLS_ECP_DP_BP256R1:MBEDTLS_ECP_MOD_SCALAR
@@ -1325,6 +1361,11 @@
 depends_on:MBEDTLS_ECP_DP_BP256R1_ENABLED
 ecp_mod_add_sub:"6bd0638b4d100d8fdaf0105ba06c05a1c76abf436fa84dcaac0ae4e2f729b4c8":"6856e45b95c76ab488bafad959d5450592f3277b62c82185d55ec1a581daad10":MBEDTLS_ECP_DP_BP256R1:MBEDTLS_ECP_MOD_SCALAR
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #22.0 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_BP384R1)
+depends_on:MBEDTLS_ECP_DP_BP384R1_ENABLED
+ecp_mod_add_sub:"8cb91e82a3386d280f5d6f7e50e641df152f7109ed5456b412b1da197fb71123acd3a729901d1a71874700133107ec52":"8cb91e82a3386d280f5d6f7e50e641df152f7109ed5456b412b1da197fb71123acd3a729901d1a71874700133107ec51":MBEDTLS_ECP_DP_BP384R1:MBEDTLS_ECP_MOD_COORDINATE
+
 ecp_add_sub #22 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_BP384R1)
 depends_on:MBEDTLS_ECP_DP_BP384R1_ENABLED
 ecp_mod_add_sub:"4a5792b26aba54efa25994fc58aaac8176f7f138456bb11bd997c6f7cb3a88f684b5b4de4abcc4e46bd881fd21334eb0":"454608a5737b6ed79182c3c8e288b16437d02410a675a109bdf84ab55632a44614777e962b56363cf5efd434db045aae":MBEDTLS_ECP_DP_BP384R1:MBEDTLS_ECP_MOD_COORDINATE
@@ -1337,6 +1378,11 @@
 depends_on:MBEDTLS_ECP_DP_BP384R1_ENABLED
 ecp_mod_add_sub:"7d500f7cbcefd0a747679714b4fab1019bde81635a427c37ead6b3cbade562bc5a58b185775c303c551b7f9da0996d52":"4c736db374d0df35a0c2995f40498cb35e819615f69b31ce0570ceeead0faadaf47076520f81f60c96e1689405adc011":MBEDTLS_ECP_DP_BP384R1:MBEDTLS_ECP_MOD_COORDINATE
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #25.0 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_BP384R1)
+depends_on:MBEDTLS_ECP_DP_BP384R1_ENABLED
+ecp_mod_add_sub:"8cb91e82a3386d280f5d6f7e50e641df152f7109ed5456b31f166e6cac0425a7cf3ab6af6b7fc3103b883202e9046564":"8cb91e82a3386d280f5d6f7e50e641df152f7109ed5456b31f166e6cac0425a7cf3ab6af6b7fc3103b883202e9046563":MBEDTLS_ECP_DP_BP384R1:MBEDTLS_ECP_MOD_SCALAR
+
 ecp_add_sub #25 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_BP384R1)
 depends_on:MBEDTLS_ECP_DP_BP384R1_ENABLED
 ecp_mod_add_sub:"1aa4b64091b1078e926baeafe79a27e68ab12c32f6f22f41538e504edc52bdcab2d87d5e29c0e596b2109307abd8952c":"846008638daf051b79e4444ed6897d8fc5ab8f2f33dc30a8f1233c76f31b6928298956cfca65f8e9f66ad57e1464134":MBEDTLS_ECP_DP_BP384R1:MBEDTLS_ECP_MOD_SCALAR
@@ -1349,6 +1395,11 @@
 depends_on:MBEDTLS_ECP_DP_BP384R1_ENABLED
 ecp_mod_add_sub:"526ef7026988f4fe5a8181b691406be110d7c25ccf3d0b35815a3d516a91f397bc73a83fd63ed5ba385ac4bda9bf98c":"8a7db67fdc960f12f8d45cb940a230e6201a95cc5762e3571d140ed89cb6c63de9bfec51f06516210da1920569eb8cb4":MBEDTLS_ECP_DP_BP384R1:MBEDTLS_ECP_MOD_SCALAR
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #28.0 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_BP512R1)
+depends_on:MBEDTLS_ECP_DP_BP512R1_ENABLED
+ecp_mod_add_sub:"aadd9db8dbe9c48b3fd4e6ae33c9fc07cb308db3b3c9d20ed6639cca703308717d4d9b009bc66842aecda12ae6a380e62881ff2f2d82c68528aa6056583a48f2":"aadd9db8dbe9c48b3fd4e6ae33c9fc07cb308db3b3c9d20ed6639cca703308717d4d9b009bc66842aecda12ae6a380e62881ff2f2d82c68528aa6056583a48f1":MBEDTLS_ECP_DP_BP512R1:MBEDTLS_ECP_MOD_COORDINATE
+
 ecp_add_sub #28 MBEDTLS_ECP_MOD_COORDINATE(MBEDTLS_ECP_DP_BP512R1)
 depends_on:MBEDTLS_ECP_DP_BP512R1_ENABLED
 ecp_mod_add_sub:"46150f34caab02c83d4d071b2bda77121e84949cd11a8404e33c37f188ddf9181f49e090328475a738868e9b5a124b1d0fb5d240c846756acfc1d5507a299d74":"4ca44e40943e5a2248d4a701f3d13a7bb243f13dd61005357b5f2ea9ac6cc64e1d76f9d1d80caa4d068508d51f0c6f07da305f2cd76ee016576b7da1060344bf":MBEDTLS_ECP_DP_BP512R1:MBEDTLS_ECP_MOD_COORDINATE
@@ -1361,6 +1412,11 @@
 depends_on:MBEDTLS_ECP_DP_BP512R1_ENABLED
 ecp_mod_add_sub:"125fdb0f50884d442833e1d550de93987d7015fc808aefcf83f18d61160c7c39b674c4f4dabd2a4c08736a21f985732a7b99a1261183c1860cc1e0331fe78154":"6b153e7ab1b20f01f34624556ba6cc6d50a078d8b3effcadc29237ff7f03ca9ea0a0304d5f56ed310d95a7016e7ceb10e2f416a79f781c980b1ed724cd18e1a9":MBEDTLS_ECP_DP_BP512R1:MBEDTLS_ECP_MOD_COORDINATE
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #31.0 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_BP512R1)
+depends_on:MBEDTLS_ECP_DP_BP512R1_ENABLED
+ecp_mod_add_sub:"aadd9db8dbe9c48b3fd4e6ae33c9fc07cb308db3b3c9d20ed6639cca70330870553e5c414ca92619418661197fac10471db1d381085ddaddb58796829ca90068":"aadd9db8dbe9c48b3fd4e6ae33c9fc07cb308db3b3c9d20ed6639cca70330870553e5c414ca92619418661197fac10471db1d381085ddaddb58796829ca90067":MBEDTLS_ECP_DP_BP512R1:MBEDTLS_ECP_MOD_SCALAR
+
 ecp_add_sub #31 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_BP512R1)
 depends_on:MBEDTLS_ECP_DP_BP512R1_ENABLED
 ecp_mod_add_sub:"8da65a44ef3f7a401993edb1bfbc2a588df13f021b538e133d019261b7149706876cfe7c82e63e71904a896fc4758a8dff09f0150948f14b16baa014cc7ab32f":"731323ee13201b6215fa8a36d04d65c3974f6606cc57efacd9a68b4125321dc9703d20db1f69af34524ab0a892ca38f37f961cd3ebdc77a0496be3975f99ac4":MBEDTLS_ECP_DP_BP512R1:MBEDTLS_ECP_MOD_SCALAR
@@ -1373,6 +1429,11 @@
 depends_on:MBEDTLS_ECP_DP_BP512R1_ENABLED
 ecp_mod_add_sub:"71bf2f08e9f7f9da70376bad2555e5ee6d966bcd5a91d4c949cc37677d2519b34ac7eb999581b2eb394c3b17ac666bfb292c157fdc0754a6b1d5f0224c3a235":"174907806c5d14842eea9771503c14af0b869300dd771fce2b72143f41483337ef0bfa78e656abc109691290dbcceb43acd62c6ab46977d09f355e742feb67af":MBEDTLS_ECP_DP_BP512R1:MBEDTLS_ECP_MOD_SCALAR
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #34.0 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_CURVE25519)
+depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+ecp_mod_add_sub:"1000000000000000000000000000000014def9dea2f79cd65812631a5cf5d3ec":"1000000000000000000000000000000014def9dea2f79cd65812631a5cf5d3eb":MBEDTLS_ECP_DP_CURVE25519:MBEDTLS_ECP_MOD_SCALAR
+
 # The following data was generated using python's standard random library,
 # initialised with seed(4,2) and random.getrandbits(curve bits). Curve bits are 128,254,192,256,448.
 ecp_add_sub #34 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_CURVE25519)
@@ -1387,6 +1448,11 @@
 depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
 ecp_mod_add_sub:"0c79d67946d4ac7a5c3902b38963dc6e8534f45738d048ec0f1099c6c3e1b258":"0690526ed6f0b09f165c8ce36e2f24b43000de01b2ed40ed3addccb2c33be0a":MBEDTLS_ECP_DP_CURVE25519:MBEDTLS_ECP_MOD_SCALAR
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #37.0 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP192K1)
+depends_on:MBEDTLS_ECP_DP_SECP192K1_ENABLED
+ecp_mod_add_sub:"fffffffffffffffffffffffe26f2fc170f69466a74defd8c":"fffffffffffffffffffffffe26f2fc170f69466a74defd8b":MBEDTLS_ECP_DP_SECP192K1:MBEDTLS_ECP_MOD_SCALAR
+
 ecp_add_sub #37 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP192K1)
 depends_on:MBEDTLS_ECP_DP_SECP192K1_ENABLED
 ecp_mod_add_sub:"f5ff0c03bb5d7385de08caa1a08179104a25e4664f5253a0":"f1cfd99216df648647adec26793d0e453f5082492d83a823":MBEDTLS_ECP_DP_SECP192K1:MBEDTLS_ECP_MOD_SCALAR
@@ -1399,6 +1465,11 @@
 depends_on:MBEDTLS_ECP_DP_SECP192K1_ENABLED
 ecp_mod_add_sub:"3fb62d2c81862fc9634f806fabf4a07c566002249b191bf4":"b474c7e89286a1754abcb06ae8abb93f01d89a024cdce7a6":MBEDTLS_ECP_DP_SECP192K1:MBEDTLS_ECP_MOD_SCALAR
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #40.0 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP224K1)
+depends_on:MBEDTLS_ECP_DP_SECP224K1_ENABLED
+ecp_mod_add_sub:"10000000000000000000000000001dce8d2ec6184caf0a971769fb1f6":"10000000000000000000000000001dce8d2ec6184caf0a971769fb1f5":MBEDTLS_ECP_DP_SECP224K1:MBEDTLS_ECP_MOD_SCALAR
+
 ecp_add_sub #40 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP224K1)
 depends_on:MBEDTLS_ECP_DP_SECP224K1_ENABLED
 ecp_mod_add_sub:"069f85e3131f3b9238224b122c3e4a892d9196ada4fcfa583e1df8af9":"0a5e333cb88dcf94384d4cd1f47ca7883ff5a52f1a05885ac7671863c":MBEDTLS_ECP_DP_SECP224K1:MBEDTLS_ECP_MOD_SCALAR
@@ -1415,6 +1486,11 @@
 depends_on:MBEDTLS_ECP_DP_SECP224K1_ENABLED
 ecp_mod_add_sub:"100000000000000000000000000006f985b17b9662f0733c846bbe9e8":"10000000000000000000000000000a26a52175b7a96b98b5fbf37a2be":MBEDTLS_ECP_DP_SECP224K1:MBEDTLS_ECP_MOD_SCALAR
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #43.0 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP256K1)
+depends_on:MBEDTLS_ECP_DP_SECP256K1_ENABLED
+ecp_mod_add_sub:"fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364140":"fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd036413f":MBEDTLS_ECP_DP_SECP256K1:MBEDTLS_ECP_MOD_SCALAR
+
 ecp_add_sub #43 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_SECP256K1)
 depends_on:MBEDTLS_ECP_DP_SECP256K1_ENABLED
 ecp_mod_add_sub:"5b69dc230af5ac870692b534758240df4a7a03052d733dcdef40af2e54c0ce68":"acdac615bc20f6264922b9ccf469aef8f6e7d078e55b85dd1525f363b281b888":MBEDTLS_ECP_DP_SECP256K1:MBEDTLS_ECP_MOD_SCALAR
@@ -1427,6 +1503,11 @@
 depends_on:MBEDTLS_ECP_DP_SECP256K1_ENABLED
 ecp_mod_add_sub:"1f44ebd13cc75f3edcb285f89d8cf4d4950b16ffc3e1ac3b4708d9893a973000":"ae17584a9ed9c621de97faf0f17ca82cdc82f2526911c9dda6e46653c676176a":MBEDTLS_ECP_DP_SECP256K1:MBEDTLS_ECP_MOD_SCALAR
 
+# Use the test data "modulus - 1" and "modulus - 2" to ensure the sum overflow case be tested.
+ecp_add_sub #46.0 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_CURVE448)
+depends_on:MBEDTLS_ECP_DP_CURVE448_ENABLED
+ecp_mod_add_sub:"00000000000000003fffffffffffffffffffffffffffffffffffffffffffffffffffffff7cca23e9c44edb49aed63690216cc2728dc58f552378c292ab5844f2":"00000000000000003fffffffffffffffffffffffffffffffffffffffffffffffffffffff7cca23e9c44edb49aed63690216cc2728dc58f552378c292ab5844f1":MBEDTLS_ECP_DP_CURVE448:MBEDTLS_ECP_MOD_SCALAR
+
 ecp_add_sub #46 MBEDTLS_ECP_MOD_SCALAR(MBEDTLS_ECP_DP_CURVE448)
 depends_on:MBEDTLS_ECP_DP_CURVE448_ENABLED
 ecp_mod_add_sub:"0000000000000003f28adf9f6396ae3994b971761b2ceba40031ad622ed93874ac034cf71b34e47e4e2aafd310096249e2387a54b1cef3913e7d611d163b764":"0000000000000003f924aec4a53583bff4788955cdb7f4ccde9d231c8a38e7b5d7d255f2b68beef746ccfcd0b77d43a5d02db430267ce8c92b607d554d08ce6":MBEDTLS_ECP_DP_CURVE448:MBEDTLS_ECP_MOD_SCALAR