PKCS1 padding scheme for SHA1 digest algorithm $ PADDING=0001ffffffffffffffffffffffffffffffffffffffffffffffffffff00 $ ANS1_SHA1_MAGIC=3021300906052b0e03021a05000414 $ SHA1_HASH=`shasum -a 1 myfile.txt | cut -d ' ' -f1` $ echo $PADDING$ANS1_SHA1_MAGIC$SHA1_HASH 0001ffffffffffffffffffffffffffffffffffffffffffffffffffff003021300906052b0e03021a050004148c723a0fa70b111017b4a6f06afe1c0dbcec14e3 Step 3: Get modulus and private exponent from private key # Verify the signature of file $ openssl dgst -sha1 -verify mypublic.pem -signature sha1.sign myfile.txt Verified OK Openssl decrypts the signature to generate hash and compares it to the hash of the input file.$ openssl rsa -in myprivate.pem -pubout > mypublic.pem # Cat the contents of private key $ cat myprivate.pem -BEGIN RSA PRIVATE KEY- MIIBOwIBAAJBAMv7Reawnxr0DfYN3IZbb5ih/XJGeLWDv7WuhTlie//c2TDXw/mW 914VFyoBfxQxAezSj8YpuADiTwqDZl13wKMCAwEAAQJAYaTrFT8/KpvhgwOnqPlk NmB0/psVdW6X+tSMGag3S4cFid3nLkN384N6tZ+na1VWNkL圓2Ndpxo6pQq4NSAb YQIhAPNlJsV+Snpg+JftgviV5+jOKY03bx29GsZF+umN6hD/AiEA1ouXAO2mVGRk BuoGXe3o/d5AOXj41vTB8D6IUGu8bF0CIQC6zah7LRmGYYSKPk0l8w+hmxFDBAex IGE7SZxwwm2iCwIhAInnDbe2CbyjDrx2/oKvopxTmDqY7HHWvzX6K8pthZ6tAiAw w+DJoSx81QQpD8gY/BXjovadVtVROALaFFvdmN64sw= -END RSA PRIVATE KEY- Sign using Openssl RSA sign and verify using OpenSSL Create sample data file, private key and public key # Create a file containing all lower case alphabets $ echo abcdefghijklmnopqrstuvwxyz > myfile.txt # Generate 512 bit Private key $ openssl genrsa -out myprivate.pem 512 # Separate the public part from the Private key file. Message received by the recipient is authenticated using public key.Message / file to be sent is signed with private key.A digital signature is a mathematical scheme for presenting the authenticity of digital messages or documents.
HEX HASH CALCULATOR VERIFICATION
Jupyter (IPython) notebook version of this page: openssl_sign_verify Digital signature and verification
RSA sign and verify using Openssl : Behind the scene
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