Implement the support for reading private/public keys from the content

ballerina/private_public_key.bal

@@ -170,6 +170,19 @@ public isolated function decodeRsaPrivateKeyFromKeyFile(string keyFile, string?
     'class: "io.ballerina.stdlib.crypto.nativeimpl.Decode"
 } external;
 
+# Decodes the RSA private key from the given private key content as a byte array.
+# ```ballerina
+# byte[] keyFileContent = [45,45,45,45,45,66,69,71,73,78,...];
+# crypto:PrivateKey privateKey = check crypto:decodeRsaPrivateKeyFromContent(keyFileContent, "keyPassword");
+# ```
+#
+# + keyFile - Private key content as a byte array
+# + keyPassword - Password of the private key if it is encrypted
+# + return - Reference to the private key or else a `crypto:Error` if the private key was unreadable
+public isolated function decodeRsaPrivateKeyFromContent(byte[] content, string? keyPassword = ()) returns PrivateKey|Error = @java:Method {
+    'class: "io.ballerina.stdlib.crypto.nativeimpl.Decode"
+} external;
+
 # Decodes the EC private key from the given private key and private key password.
 # ```ballerina
 # string keyFile = "/path/to/private.key";
@@ -292,6 +305,18 @@ public isolated function decodeRsaPublicKeyFromCertFile(string certFile) returns
     'class: "io.ballerina.stdlib.crypto.nativeimpl.Decode"
 } external;
 
+# Decodes the RSA public key from the given public certificate content.
+# ```ballerina
+# byte[] certContent = [45,45,45,45,45,66,69,71,73,78,...];
+# crypto:PublicKey publicKey = check crypto:decodeRsaPublicKeyFromContent(certContent);
+# ```
+#
+# + certFile - The certificate content as a byte array
+# + return - Reference to the public key or else a `crypto:Error` if the public key was unreadable
+public isolated function decodeRsaPublicKeyFromContent(byte[] content) returns PublicKey|Error = @java:Method {
+    'class: "io.ballerina.stdlib.crypto.nativeimpl.Decode"
+} external;
+
 # Decodes the EC public key from the given public certificate file.
 # ```ballerina
 # string certFile = "/path/to/public.cert";