[openssl-users] EVP_MD_CTX and EVP_PKEY_CTX? How to init? How to free?

Dr. Stephen Henson steve at openssl.org
Sun Apr 30 19:19:17 UTC 2017

On Sun, Apr 30, 2017, Blumenthal, Uri - 0553 - MITLL wrote:

> Semi-related question. Is RSA_NO_PADDING allowed for EVP signature? When I tried that (without using DigestSign of course), signing succeeded but verification always failed. Was that expected? Are there some special settings one needs to apply besides just setting the padding type?

With RSA_NO_PADDING it isn't possible to determine the length of the decrypted
data during verify. We should really return an error code if an atttempt is
made to use it for sign/verify.

Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org

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