RFC9830.hash_to_field() is mod n, not mod q.

Regenerate test data.
JohnLCaron · May 23, 2024 · 73626d9 · 73626d9
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diff --git a/src/main/kotlin/org/cryptobiotic/eg/core/ecgroup/RFC9380.kt b/src/main/kotlin/org/cryptobiotic/eg/core/ecgroup/RFC9380.kt
@@ -50,7 +50,7 @@ class RFC9380(val group: EcGroupContext, val DST: ByteArray, kBytes: Int) {
         //Steps:
         val uniform_bytes = expand_message(msg)
         val bi = BigInteger(1, uniform_bytes) // OS2IP equiv
-        return EcElementModQ(group, bi.mod(group.vecGroup.primeModulus)) // note that p == q for P-256
+        return EcElementModQ(group, bi.mod(group.vecGroup.order))
     }
 
     // expand_message_xmd(msg, DST, len_in_bytes)

diff --git a/src/test/data/encrypt/testBallotChain/election_initialized.json b/src/test/data/encrypt/testBallotChain/election_initialized.json
@@ -1,25 +1,25 @@
 {
-    "joint_public_key": "AvTfcvOKoNHlHz1GU48IjwKfYhuLGN3B74ewPir2SA5s",
-    "extended_base_hash": "+6hSNYbeU8WfJrb+Gyf61lulRHqtdOniIfwUqKTPuNc=",
+    "joint_public_key": "AtbNIz9IGwKWu92Er3oj1R4VAxArlGTsPHrpr3oa/Rdi",
+    "extended_base_hash": "pLm25Y9UBGqTm7EcYG/O8DrtMYlOWgbAy4pftHHqv5c=",
     "guardians": [
         {
             "guardian_id": "guardian1",
             "x_coordinate": 1,
             "coefficient_proofs": [
                 {
-                    "public_key": "A4eMashhI98O02pU+6e2CqKUyyZCYo6zPmQiGFhNaNB4",
-                    "challenge": "D+H0hhcB4SQD/vVjIUPyybAUTqH4U1X5E5IwZdFRfFY=",
-                    "response": "QqE88/4ir0jmL5s4tke0iiBwuheJHFaAvEZ0SSV4Qc8="
+                    "public_key": "AyyxMiJpt8I5Tu4F1pblJkltg/2PhIq8GdS75pdyOw8k",
+                    "challenge": "N3O2IDi04ZlxZBlY8TVWJDPa+QvKsn5oey4t4i74OeQ=",
+                    "response": "v77cUuV7S++P9MmILIwxgMjYuN0RfV0p8F80SvRQ2Y8="
                 },
                 {
-                    "public_key": "ArS2BS4g+HpWlWCl+6/NXy20Z6Xx93A3ASSgo4Dr5GTM",
-                    "challenge": "wMbDd0LayRE5AH4nO7G5vGNrOwdKsiuWCJc2DQpwbhI=",
-                    "response": "07R9ziYohrsTv4lM+2S38nrntnsl3n+8OG/L3CuXY0I="
+                    "public_key": "A+z693r7pSvFBrVz7JPr8Kfwd6QfrWx+SnVQRk1C++l0",
+                    "challenge": "XXMsLZn6AuFlHxK3YDPN2ORHAPqkNVfa8W4MOkBNdmM=",
+                    "response": "v68Os+784ByRRW0Oua8fs/gPKyuwwHeAbrM3M2ToONA="
                 },
                 {
-                    "public_key": "ArwfSVXyiu4v6j5lwxJLzr1pqgkRqF9IuAGLjT3hs2Nl",
-                    "challenge": "P5+sGxVOxvDKVAnpn/EgSfz76rusQW96OrkxsiZzTqY=",
-                    "response": "cJGdGGS5PTQsdciIj11jZrbBnu09Xm++IjAq/y9mTcM="
+                    "public_key": "A5P7VqJc1L/P2PlRAagQQGa5zNDt7IvWHG02ETSHA0+7",
+                    "challenge": "ONHZw1hgekQ6aQ70tVjHw/nvsM0EJnofpx2a97U7eig=",
+                    "response": "GbpVLg0ikH+5/ODl7Yem8WYmImdVJawpb8xa1uNnGnQ="
                 }
             ]
         },
@@ -28,19 +28,19 @@
             "x_coordinate": 2,
             "coefficient_proofs": [
                 {
-                    "public_key": "AvAe3k23lVllXiS8HhaL+JbBqVx9YLkelh+BPa3noGRN",
-                    "challenge": "nlR14Q9Ez+JVpB7FsBI4vKJX1c5bDsScHnF98MKZFS0=",
-                    "response": "EVVT/piF/Pr4ASAf9bsqURvN7eQi+6vUxf8P7jPABKM="
+                    "public_key": "AtIzKPY53xfoidSDHbcNUBkFZPvtIrM7OWhBE7nanNM9",
+                    "challenge": "MlmGubcq9l4IgawYASN7CaBePysCLhkPTqeWvB3ZS0Q=",
+                    "response": "kdBQXZdozRbYbPhFLtituum2f0yOqCG65zT0DftQZBE="
                 },
                 {
-                    "public_key": "AuMfuxsm4NvAUTaaSuvc3sHr366RkyuKYu/6ibuP5hT8",
-                    "challenge": "wmVI+dK2+9qi6IAv8Ag/ginTLz3+47Jaeu7adWFUOj0=",
-                    "response": "EpJorKGLfuoGXZ6Dxy6WEyrNf6+UK9Pw+a/X7wNuImg="
+                    "public_key": "A97vZPwp4GgPE0p2s0A6GB4GE7Xn3TXezY0B75iLkvwf",
+                    "challenge": "tSlptACt0aTKzLWhY/zPKxH5GU0hr/z/BXDf0Hr7HaU=",
+                    "response": "8PcKJSDYDgTLQsmZT1LmWnz1xcZGF1L4xyBQ3tx8aKA="
                 },
                 {
-                    "public_key": "Ak2Ye1Ye4VtheIujvt9/xAUSX4ClBfFdiTuZv8w5h0aw",
-                    "challenge": "kSQkqyXp521b4j1l1loAgOa7Orow0SO9QFDtBlWdXAY=",
-                    "response": "va7hnp7FJumzRW1lIspzqGLyPbNFnkKVdsTBTcFEUAc="
+                    "public_key": "A44iI1RhHNR707HfXFoZKC/jxutKWbiJvJmGG61YyoJA",
+                    "challenge": "htMnPe9Y8/AhKRKGWrbJ0b52eZ/Nak6wOmgZU6yWbj4=",
+                    "response": "rcK/jPRBv1uVGF6q4c+bJPAwciOp3QeaaYCgCD4Vm9U="
                 }
             ]
         },
@@ -49,19 +49,19 @@
             "x_coordinate": 3,
             "coefficient_proofs": [
                 {
-                    "public_key": "A26bnpvY+GeBun8JPeq0kHqWVH3H1CjHrF8x6ZD8eTgJ",
-                    "challenge": "ImVpy70iqKqnqX7NwtNZWOITBpulwsQPE5rK0bSEMlk=",
-                    "response": "rw2qgYRKMM8BOZ1aCcOGfh7Vs6EHI6IJarfyD1N2wnY="
+                    "public_key": "AmNlmeHgG/dZo+azlZFR4/zWkvmiaxFNgL8VGpfDVDx0",
+                    "challenge": "gNVAiI/EkaCEfxuD2vEUzY95ghPc3yyqdEXrbd3tnr0=",
+                    "response": "CxqavK268CzmWrc3dcOytWVre3YLpOLintxh+WUPi8A="
                 },
                 {
-                    "public_key": "A/+XIjbwhbM3LmAkko7PGcztAk+NOUEHTlEvlyAullSw",
-                    "challenge": "9v5mzECkBIHmWrhd0VXlLHadWMdMNHD3NfiwRzdXnM0=",
-                    "response": "/ksOtpNln/5ihfcb7Ls4nYEOJhzOjA3nd9ykV6rVI6g="
+                    "public_key": "AysMwJz5Fiz9lEXKw6RtnqRgIDncPXs9wjTj+ymk5ghn",
+                    "challenge": "lWodTxa4NLhjOnHw4UGg8mCRHKoArE3viM99bpFpmFw=",
+                    "response": "hvob4D7OwZFfxsa6R5E84E2rk2sk3YB8yg7PELXDgt0="
                 },
                 {
-                    "public_key": "A+3CZMgSd0G7DWo67C5kZdJkoW4yF+wSA548Vjzb/lhK",
-                    "challenge": "NYWxDcjMHPbJTJOg/6cU1Ov5RLhGi6kbncVy9FtDug8=",
-                    "response": "orC43LOI92M4QaarpDbSb1nnkpudJFxX5DjnP/PjmKQ="
+                    "public_key": "AiMWArDu9heJwu4rHhXX2nFZcV1PRFqOgbrt32JA7FoV",
+                    "challenge": "zx/zE9WGr69nsPPl9ylhumFoBVatS6NJFtSmUxUwDSw=",
+                    "response": "4v40qRIfpkEMOaR5F04a8UF+iEVQE01wjHn5LHR4xic="
                 }
             ]
         }

diff --git a/src/test/data/encrypt/testBallotChain/encrypted_ballots/device1/ballot_chain.json b/src/test/data/encrypt/testBallotChain/encrypted_ballots/device1/ballot_chain.json
@@ -9,21 +9,21 @@
         101,
         49
     ],
-    "election_base_hash": "+6hSNYbeU8WfJrb+Gyf61lulRHqtdOniIfwUqKTPuNc=",
+    "election_base_hash": "pLm25Y9UBGqTm7EcYG/O8DrtMYlOWgbAy4pftHHqv5c=",
     "ballot_ids": [
-        "id-423309862",
-        "id-557487366",
-        "id906976252",
-        "id1418213687",
-        "id-1570105887",
-        "id-976307237",
-        "id-404841242",
-        "id536728461",
-        "id-215603966",
-        "id802232992",
-        "id522733467",
-        "id690333833"
+        "id2022713283",
+        "id-193733846",
+        "id-1065313432",
+        "id-1232162799",
+        "id-1576398995",
+        "id1176997123",
+        "id-981568720",
+        "id-1102120102",
+        "id-814585975",
+        "id-368813857",
+        "id1278250060",
+        "id-1985659240"
     ],
-    "last_confirmation_code": "nGDhES44rLbH1dPo53MlSAR3c3lruOoCOI2sIow6Zh8=",
-    "closing_hash": "lt20Y7sSCYojMuyK+O1pyeDbOS/GqTvFrhhNcYNuwGg="
+    "last_confirmation_code": "bf3WpflnW/Z/gpGCXU0l5iNKgovR0iXfJFO+oquk+5c=",
+    "closing_hash": "we+vK8YwKXd67TUxUQyfAXOBZUIILdN0358JGEtcr5E="
 }