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Disable OpenSSL EVP digest padding in pgcrypto

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The PX layer in pgcrypto is handling digest padding on its own uniformly
for all backend implementations. Starting with OpenSSL 3.0.0, DecryptUpdate
doesn't flush the last block in case padding is enabled so explicitly
disable it as we don't use it.

This will be backpatched to all supported version once there is sufficient
testing in the buildfarm of OpenSSL 3.

Reviewed-by: Peter Eisentraut, Michael Paquier
Discussion: https://postgr.es/m/FEF81714-D479-4512-839B-C769D2605F8A@yesql.se
Backpatch-through: 9.6
This commit is contained in:
Daniel Gustafsson 2021-09-25 11:27:20 +02:00
parent 90cfd269f2
commit 00c72da4a2
1 changed files with 4 additions and 0 deletions
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4
contrib/pgcrypto/openssl.c
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@ -380,6 +380,8 @@ gen_ossl_decrypt(PX_Cipher *c, const uint8 *data, unsigned dlen,
{
if (!EVP_DecryptInit_ex(od->evp_ctx, od->evp_ciph, NULL, NULL, NULL))
return PXE_CIPHER_INIT;
if (!EVP_CIPHER_CTX_set_padding(od->evp_ctx, 0))
return PXE_CIPHER_INIT;
if (!EVP_CIPHER_CTX_set_key_length(od->evp_ctx, od->klen))
return PXE_CIPHER_INIT;
if (!EVP_DecryptInit_ex(od->evp_ctx, NULL, NULL, od->key, od->iv))
@ -404,6 +406,8 @@ gen_ossl_encrypt(PX_Cipher *c, const uint8 *data, unsigned dlen,
{
if (!EVP_EncryptInit_ex(od->evp_ctx, od->evp_ciph, NULL, NULL, NULL))
return PXE_CIPHER_INIT;
if (!EVP_CIPHER_CTX_set_padding(od->evp_ctx, 0))
return PXE_CIPHER_INIT;
if (!EVP_CIPHER_CTX_set_key_length(od->evp_ctx, od->klen))
return PXE_CIPHER_INIT;
if (!EVP_EncryptInit_ex(od->evp_ctx, NULL, NULL, od->key, od->iv))