Uploading images to amazon s3 from ios app using amazon sdk and bucket policy -

Uploading images to amazon s3 from ios app using amazon sdk and bucket policy -

i having problem uploading images ios app amazon s3 using newest sdk. how can upload images without using cognito service? example, have api in website returns next info

{ "success": true, "data": { "policy": "some policy", "signature": "a signature", "key": "a key" } }

now question is, without setting cognito credentials in sample app of amazon sdk, how utilize above info upload bucket (assuming know bucket name)?

thank you

ios amazon-web-services amazon-s3 sdk amazon