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diff --git a/grub-core/lib/libgcrypt/cipher/rsa-common.c b/grub-core/lib/libgcrypt/cipher/rsa-common.c
index 1920eedd8..c4819208b 100644
--- a/grub-core/lib/libgcrypt-grub/cipher/rsa-common.c
+++ b/grub-core/lib/libgcrypt-grub/cipher/rsa-common.c
@@ -912,6 +912,7 @@ _gcry_rsa_pss_encode (gcry_mpi_t *r_result, unsigned int nbits, int algo,
memcpy (p, salt, saltlen);
/* Step 9: dbmask = MGF(H, emlen - hlen - 1). */
+#if 0
if (algo == GCRY_MD_SHAKE128 || algo == GCRY_MD_SHAKE256)
{
gcry_buffer_t iov;
@@ -925,6 +926,7 @@ _gcry_rsa_pss_encode (gcry_mpi_t *r_result, unsigned int nbits, int algo,
&iov, 1);
}
else
+#endif
mgf1 (dbmask, emlen - hlen - 1, h, hlen, algo);
/* Step 10: maskedDB = DB ^ dbMask */
@@ -1086,6 +1088,7 @@ _gcry_rsa_pss_verify (gcry_mpi_t value, int hashed_already,
}
/* Step 7: dbmask = MGF(H, emlen - hlen - 1). */
+#if 0
if (algo == GCRY_MD_SHAKE128 || algo == GCRY_MD_SHAKE256)
{
gcry_buffer_t iov;
@@ -1099,6 +1202,7 @@ _gcry_rsa_pss_verify (gcry_mpi_t value, int hashed_already,
&iov, 1);
}
else
+#endif
mgf1 (dbmask, emlen - hlen - 1, h, hlen, algo);
/* Step 8: maskedDB = DB ^ dbMask. */
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