diff --git a/circuits/tests/register/register_kyc.test.ts b/circuits/tests/register/register_kyc.test.ts
index a9e68cddd..f863a29fd 100644
--- a/circuits/tests/register/register_kyc.test.ts
+++ b/circuits/tests/register/register_kyc.test.ts
@@ -3,7 +3,7 @@ import { wasm as wasmTester } from 'circom_tester';
 import path from 'path';
 import { packBytesAndPoseidon } from '@selfxyz/common/utils/hash';
 import { poseidon2 } from 'poseidon-lite';
-import { generateMockKycRegisterInput } from '@selfxyz/common/utils/kyc/generateInputs.js';
+import { generateKycRegisterInput, generateMockKycRegisterInput } from '@selfxyz/common/utils/kyc/generateInputs.js';
 import { KycRegisterInput } from '@selfxyz/common/utils/kyc/types';
 import { KYC_ID_NUMBER_INDEX, KYC_ID_NUMBER_LENGTH, KYC_ID_TYPE_INDEX, KYC_ID_TYPE_LENGTH } from '@selfxyz/common/utils/kyc/constants';
 
diff --git a/common/index.ts b/common/index.ts
index 86e9db1ee..bac966259 100644
--- a/common/index.ts
+++ b/common/index.ts
@@ -138,6 +138,7 @@ export {
   generateMockKycRegisterInput,
   NON_OFAC_DUMMY_INPUT,
   OFAC_DUMMY_INPUT,
+  generateKycRegisterInput,
 } from './src/utils/kyc/generateInputs.js';
 
 export {
diff --git a/common/src/utils/kyc/api.ts b/common/src/utils/kyc/api.ts
new file mode 100644
index 000000000..6e778ea6a
--- /dev/null
+++ b/common/src/utils/kyc/api.ts
@@ -0,0 +1,40 @@
+//Helper function to destructure the kyc data from the api response
+import { Point } from "@zk-kit/baby-jubjub";
+import { KYC_ADDRESS_INDEX, KYC_ADDRESS_LENGTH, KYC_COUNTRY_INDEX, KYC_COUNTRY_LENGTH, KYC_DOB_INDEX, KYC_DOB_LENGTH, KYC_EXPIRY_DATE_INDEX, KYC_EXPIRY_DATE_LENGTH, KYC_FULL_NAME_INDEX, KYC_FULL_NAME_LENGTH, KYC_GENDER_INDEX, KYC_GENDER_LENGTH, KYC_ID_NUMBER_INDEX, KYC_ID_NUMBER_LENGTH, KYC_ID_TYPE_INDEX, KYC_ID_TYPE_LENGTH, KYC_ISSUANCE_DATE_INDEX, KYC_ISSUANCE_DATE_LENGTH, KYC_PHONE_NUMBER_INDEX, KYC_PHONE_NUMBER_LENGTH, KYC_PHOTO_HASH_INDEX, KYC_PHOTO_HASH_LENGTH } from "./constants.js";
+import { KycData } from "./types.js";
+
+//accepts a base64 signature and returns a signature object
+export function deserializeSignature(signature: string): { R: Point<bigint>; s: bigint} {
+  const [Rx, Ry, s] = Buffer.from(signature, 'base64').toString('utf-8').split(',').map(BigInt);
+  return { R: [Rx, Ry] as Point<bigint>, s };
+}
+
+//accepts a base64 applicant info and returns a kyc data object
+export function deserializeApplicantInfo(applicantInfoBase64: string): Omit<KycData, 'user_identifier' | 'current_date' | 'majority_age_ASCII' | 'selector_older_than'> {
+  const applicantInfo = Buffer.from(applicantInfoBase64, 'base64').toString('utf-8');
+  const country = applicantInfo.slice(KYC_COUNTRY_INDEX, KYC_COUNTRY_INDEX + KYC_COUNTRY_LENGTH).replace(/\x00/g, '');
+  const idType = applicantInfo.slice(KYC_ID_TYPE_INDEX, KYC_ID_TYPE_INDEX + KYC_ID_TYPE_LENGTH).replace(/\x00/g, '');
+  const idNumber = applicantInfo.slice(KYC_ID_NUMBER_INDEX, KYC_ID_NUMBER_INDEX + KYC_ID_NUMBER_LENGTH).replace(/\x00/g, '');
+  const issuanceDate = applicantInfo.slice(KYC_ISSUANCE_DATE_INDEX, KYC_ISSUANCE_DATE_INDEX + KYC_ISSUANCE_DATE_LENGTH).replace(/\x00/g, '');
+  const expiryDate = applicantInfo.slice(KYC_EXPIRY_DATE_INDEX, KYC_EXPIRY_DATE_INDEX + KYC_EXPIRY_DATE_LENGTH).replace(/\x00/g, '');
+  const fullName = applicantInfo.slice(KYC_FULL_NAME_INDEX, KYC_FULL_NAME_INDEX + KYC_FULL_NAME_LENGTH).replace(/\x00/g, '');
+  const dob = applicantInfo.slice(KYC_DOB_INDEX, KYC_DOB_INDEX + KYC_DOB_LENGTH).replace(/\x00/g, '');
+  const photoHash = applicantInfo.slice(KYC_PHOTO_HASH_INDEX, KYC_PHOTO_HASH_INDEX + KYC_PHOTO_HASH_LENGTH).replace(/\x00/g, '');
+  const phoneNumber = applicantInfo.slice(KYC_PHONE_NUMBER_INDEX, KYC_PHONE_NUMBER_INDEX + KYC_PHONE_NUMBER_LENGTH).replace(/\x00/g, '');
+  const gender = applicantInfo.slice(KYC_GENDER_INDEX, KYC_GENDER_INDEX + KYC_GENDER_LENGTH).replace(/\x00/g, '');
+  const address = applicantInfo.slice(KYC_ADDRESS_INDEX, KYC_ADDRESS_INDEX + KYC_ADDRESS_LENGTH).replace(/\x00/g, '');
+
+  return {
+    country,
+    idType,
+    idNumber,
+    issuanceDate,
+    expiryDate,
+    fullName,
+    dob,
+    photoHash,
+    phoneNumber,
+    gender,
+    address
+  };
+}
diff --git a/common/src/utils/kyc/generateInputs.ts b/common/src/utils/kyc/generateInputs.ts
index 7fbc9a40a..45ccfc30e 100644
--- a/common/src/utils/kyc/generateInputs.ts
+++ b/common/src/utils/kyc/generateInputs.ts
@@ -14,6 +14,7 @@ import { signEdDSA } from './ecdsa/ecdsa.js';
 import { LeanIMT } from '@openpassport/zk-kit-lean-imt';
 import { packBytesAndPoseidon } from '../hash.js';
 import { COMMITMENT_TREE_DEPTH } from '../../constants/constants.js';
+import { deserializeApplicantInfo, deserializeSignature } from './api.js';
 
 export const OFAC_DUMMY_INPUT: KycData = {
   country: 'KEN',
@@ -86,6 +87,26 @@ export const generateMockKycRegisterInput = async (
   return kycRegisterInput;
 };
 
+export const generateKycRegisterInput = async (applicantInfoBase64: string, signatureBase64: string, pubkeyStr: [string, string], secret: string) => {
+  const applicantInfo = deserializeApplicantInfo(applicantInfoBase64);
+  const signature = deserializeSignature(signatureBase64);
+  const pubkey = [BigInt(pubkeyStr[0]), BigInt(pubkeyStr[1])] as [bigint, bigint];
+
+  const serializedData = serializeKycData(applicantInfo);
+
+  const msgPadded = Array.from(serializedData, (x) => x.charCodeAt(0));
+
+  const kycRegisterInput: KycRegisterInput = {
+    data_padded: msgPadded.map((x) => Number(x)),
+    s: signature.s,
+    R: signature.R,
+    pubKey: pubkey,
+    secret,
+  };
+
+  return kycRegisterInput;
+}
+
 export const generateCircuitInputsOfac = (data: KycData, smt: SMT, proofLevel: number) => {
   const name = data.fullName;
   const dob = data.dob;
diff --git a/common/src/utils/kyc/types.ts b/common/src/utils/kyc/types.ts
index d4bcce6ea..297c4103c 100644
--- a/common/src/utils/kyc/types.ts
+++ b/common/src/utils/kyc/types.ts
@@ -19,11 +19,11 @@ export type KycData = {
   selector_older_than: string;
 };
 
-export const serializeKycData = (kycData: KycData) => {
+export const serializeKycData = (kycData: Omit<KycData, 'user_identifier' | 'current_date' | 'majority_age_ASCII' | 'selector_older_than'>) => {
   //ensure max length of each field
   let serializedData = '';
-  serializedData += kycData.country.toUpperCase().padEnd(constants.KYC_COUNTRY_LENGTH, '\0');
-  serializedData += kycData.idType.toUpperCase().padEnd(constants.KYC_ID_TYPE_LENGTH, '\0');
+  serializedData += kycData.country.padEnd(constants.KYC_COUNTRY_LENGTH, '\0');
+  serializedData += kycData.idType.padEnd(constants.KYC_ID_TYPE_LENGTH, '\0');
   serializedData += kycData.idNumber.padEnd(constants.KYC_ID_NUMBER_LENGTH, '\0');
   serializedData += kycData.issuanceDate.padEnd(constants.KYC_ISSUANCE_DATE_LENGTH, '\0');
   serializedData += kycData.expiryDate.padEnd(constants.KYC_EXPIRY_DATE_LENGTH, '\0');