OpenSSL "rsautl -verify -raw" for RSA Public Key Encryption

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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2017-03-11, 373👍, 0💬