RSA Encryption

RSA Encryption is an algorithm encrypting public keys to protect information on the transmission line. Use a pair of key (public key and private key) to encrypt and decrypt the data. Partner uses public key provided by MoMo to encrypt the data in MoMo's format, MoMo uses private key to decrypt.
You might want to take a look at the number of ways to create MoMo’s RSA.

Data before encrypt RSA

{
  "partnerCode": "MOMOIQA420180417",
  "partnerRefId": "Merchant123556666",
  "partnerTransId": "8374736463",
  "amount": 40000,
  "description": "Thanh toan momo"
}

Data after encrypt RSA

A7WFmmnpn6TRX42Akh/iC5DdU5hhBT9LR5QSG6rJAl70hfEkkGUx2pTCai8s+M9KMVUcJ7m52iv74yhmeEjjN10TtEJoqITBIYBG2bqcTprhDijyhV4ePU7ytDNuLxzzIvGfTYyvbsEJ2jZTSf556yod12vhYqOJSFL/U2hVuxjUahf5Rnu5R/OLalg8QmlU6nQooEuNdzEXPMd6j9EaxOCiB2oM5/9QiTN0tCNSTIVvPtnlHu5mIbBHChcwfToIL4IAiD1nbrlDuBX//CZcrZj6hFqjvU31yb/DuG02c3aqWxbZKZ8csOwF9bL30m/yGr/0BQUWgunpDPrmCosf9A==

Online tools, try yourself