OpenSSL "rsautl -sign -raw" for RSA Private Key Decryption

Q

What is the difference between "rsautl -encrypt" and "rsautl -verify" commands?\\n

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A

\\nThere is only 1 difference between "rsautl -encrypt" and "rsautl -verify" commands:\\n

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1. "rsautl -encrypt" and "rsautl -verify" commands apply PKCS#1 v1.5 padding differently:\\n

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  • "rsautl -encrypt" adds PKCS#1 v1.5 padding before applying RSA encryptin with an RSA public key.\\n
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  • "rsautl -verify" removes PKCS#1 v1.5 padding after applying RSA decryptin with an RSA public key.\\n
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So if we are using no padding, "rsautl -encrypt" and "rsautl -verify" have no differences, \\nbecause RSA encryption and RSA decryption are identical algorithms.\\nIn other words, "rsautl -encrypt -raw" and "rsautl -sign -raw" are identical commands.\\n

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OpenSSL "rsautl" Command for RSA Keys

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2017-02-28, 293👍, 0💬