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RSA_SIZE(3) Library Functions Manual RSA_SIZE(3)

RSA_sizeget RSA modulus size

#include <openssl/rsa.h>

RSA_size(const RSA *rsa);

This function returns the RSA modulus size in bytes. It can be used to determine how much memory must be allocated for an RSA encrypted value.

rsa and rsa->n must not be NULL.

The size in bytes.


RSA_size() is available in all versions of SSLeay and OpenSSL.

December 11, 2016 OpenBSD-6.1