tree c8e3c6daaed109775ef759ea9f9d10d85af430aa
parent ab1d7ab89f66c08a32912c434558ba3268a7a98b
author Gilles Peskine <Gilles.Peskine@arm.com> 1530884874 +0200
committer itayzafrir <itay.zafrir@arm.com> 1536759671 +0300

RSA encryption: accept input=NULL if ilen=0

In mbedtls_rsa_rsaes_oaep_encrypt and
mbedtls_rsa_rsaes_pkcs1_v15_encrypt, if the input length is 0 (which
is unusual and mostly useless, but permitted) then it is fine for the
input pointer to be NULL. Don't return an error in this case.

When `input` is NULL, `memcpy( p, input, ilen )` has undefined
behavior even if `ilen` is zero. So skip the `memcpy` call in this
case. Likewise, in `mbedtls_rsa_rsaes_oaep_decrypt` and
`mbedtls_rsa_rsaes_pkcs1_v15_decrypt`, skip the `memcpy` call if
`*olen` is zero.