Hello guys i am stuck at an issue please help me

for the biometric authentication in my app, from front-end i am getting public key, signature.

for generating key pair, front end using this library → [react-native-biometrics - npm]
and this algorithms → Algorithmic used by above library

example
like i am getting following public key and signature form front end
public_key : MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsdBu6w2Var6TJHT8TQ1WdDpMu4VzSrDRP8DjY0WI9ddZvQSvjTdUQ9qm3fyZufZpmhPXfjkmg+f/cbJh+m+Zzhf093bcqVVnmEl+an/FTPMaOy2jfYNbxwZDuYCUxJzewGDa74vXCYB2sPgqZikf3UlhI0ZPO8tbdhleGoiQXOcXloAELQ+ebQ6MDBr+QDqNedPW+hLultTClH56v88Tp85PT6HWnPjVQUAWR7QeL+U8mFZOQALBruQvqfB3BwromhTkTB5XtCy1WCGBtzs21CTok4+pWp5QM/E3IUv1B8dtZDqjMIyGhUnM7pFmgL58UYV1unhyMH/cM+ffzlJWIQIDAQAB

Signature : it is encryption of text = "1675256878678"

DQ6vLV4cRAMcCkpT0MTMHPUc8IoMvcckhjY9Fyirq/zX1Ej851g+IojotyPMqSFKbRqrpE3F2OTI717fcAxFRMCFYlcuf1mYjniCJtGTkxTE6m6GNy+ApX5ssUSb3pZajXcLw/YnKvnbiYtsnL0mFgZ27krrp8ZxEf9iDFBJRZW7JVxjaeGqe5jIN64+NODgR+OvMvHPLpNjKIrZleXwQwbOpWE1q9EIhWmApc2bDdUFeaa5RtGOLI9WNkitkhW/Dsk5FNiZOW7oo85IE65cMJ09XTKHCUmYQnhwtdKibKK84koKXELvBat9/aWe+GBdQJQa6mNFfEPnvcmpXDu3tQ==

in the backend i am using elixir ExPublicKey
so the issue that, the public key i am getting from the front end is not getting load as
the public key object type, something like that

{:ok, public_key} = ExPublicKey.loads(public_key)
iex(64)> ExPublicKey.loads(public_key)
{:error, "invalid argument"}

the desired results should be like this

iex(67)> {:ok, public_key} = ExPublicKey.loads(public_key)
{:ok, #ExPublicKey.RSAPublicKey<
   fingerprint_sha256=                                                                                                   bc                                                                                                         
     31
     a4
     6b
     51
     67
     68
     b2
     63
     60
     66
     73
     39
     ad
     c8
     66
     1e
     07
     9d
     0c
     02
     e6
     31
     23
     16
     9d
     a3
     78
     4a
     04
     ef
     e8>}

{ok, "1675256878678"} = ExPublicKey.decrypt_public(params.signature, public_key, [])

Help me out here. or any alternative solution in elixir for the above encryption/decryption