# Generate a Private Key openssl genrsa -out privatekey.pem 2048 # Generate a self-signed certificate openssl req -new -x509 -key privatekey.pem -out self_signed_certificate.pem -days 365 # Convert PEM certificate to CER format openssl x509 -inform PEM -in self_signed_certificate.pem -outform DER -out self_signed_certificate.cer # Convert a PEM certificate to a PFX (PKCS#12) file openssl pkcs12 -export -out certificate.pfx -inkey privatekey.pem -in self_signed_certificate.pem # Extract a private key from a PFX file (contain bag attributes) # openssl pkcs12 -in certificate.pfx -nocerts -nodes -out privatekey_frompfx.pem openssl pkcs12 -in certificate.pfx -nocerts -nodes -out privatekey_frompfx.key # Extract a private key (no bag attributes) - identical to privatekey.pem openssl rsa -in privatekey_frompfx.key -out privatekey_frompfx.key # Extract public key from key pair openssl rsa -in privatekey_frompfx.key -pubout -out publickey.key #openssl rsa -in privatekey.pem -pubout -out publickey2.key # Convert CER to CRT openssl x509 -inform DER -in self_signed_certificate.cer -out self_signed_certificate.crt #openssl x509 -inform PEM -in self_signed_certificate.cer -out self_signed_certificate.crt # Convert CRT to CER openssl x509 -in self_signed_certificate.crt -outform DER -out self_signed_certificate2.cer ##### # Generate a Certificate Signing Request (CSR) - optional if going to generate a self-signed #openssl req -new -key privatekey.pem -out certificate_request.csr #openssl x509 -req -in certificate_request.csr -signkey privatekey.pem -out self_signed_certificate3.crt
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Wednesday, April 10, 2024
Useful openssl commands to generate certificates and keys
I hope the following will come handy when it comes to generating key pairs and certificates.
Sunday, January 14, 2024
Oracle: Find out total number of records of all tables
An efficient method to find out the total record counts of all tables in an Oracle database.
Hope it helps.
select table_name, to_number(extractvalue(xmltype(dbms_xmlgen.getxml('select count(*) c from '||owner||'.'||table_name)),'/ROWSET/ROW/C')) as count from all_tables where owner = 'SchemaName';
Hope it helps.
MSSQL: Find out total number of records of all tables
An efficient method to find out the total record counts of all tables in a MSSQL database.
Hope it helps.
SELECT tbl.name, CAST(p.rows AS int) 'count', tbl.schema_id, SCHEMA_NAME(tbl.schema_id) schema_name FROM sys.tables AS tbl INNER JOIN sys.indexes AS idx ON idx.object_id = tbl.object_id AND idx.index_id < 2 INNER JOIN sys.partitions AS p ON p.object_id = CAST(tbl.object_id AS int) AND p.index_id = idx.index_id --WHERE ((SCHEMA_NAME(tbl.schema_id) = 'dbo')) ORDER BY 2 DESC
Hope it helps.
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