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From 52b347703ba2b98a0efee86c1a483c2f0f9f73d6 Mon Sep 17 00:00:00 2001 |
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From: Clemens Lang <cllang@redhat.com> |
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Date: Wed, 11 Jan 2023 12:52:59 +0100 |
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Subject: [PATCH] rsa: Disallow SHAKE in OAEP and PSS in FIPS prov |
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|
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According to FIPS 140-3 IG, section C.C, the SHAKE digest algorithms |
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must not be used in higher-level algorithms (such as RSA-OAEP and |
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RSASSA-PSS): |
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|
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"To be used in an approved mode of operation, the SHA-3 hash functions |
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may be implemented either as part of an approved higher-level algorithm, |
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for example, a digital signature algorithm, or as the standalone |
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functions. The SHAKE128 and SHAKE256 extendable-output functions may |
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only be used as the standalone algorithms." |
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|
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Add a check to prevent their use as message digest in PSS signatures and |
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as MGF1 hash function in both OAEP and PSS. |
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|
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Signed-off-by: Clemens Lang <cllang@redhat.com> |
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--- |
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crypto/rsa/rsa_oaep.c | 28 ++++++++++++++++++++++++++++ |
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crypto/rsa/rsa_pss.c | 16 ++++++++++++++++ |
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2 files changed, 44 insertions(+) |
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|
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diff --git a/crypto/rsa/rsa_oaep.c b/crypto/rsa/rsa_oaep.c |
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index d9be1a4f98..dfe9c9f0e8 100644 |
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--- a/crypto/rsa/rsa_oaep.c |
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+++ b/crypto/rsa/rsa_oaep.c |
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@@ -73,9 +73,23 @@ int ossl_rsa_padding_add_PKCS1_OAEP_mgf1_ex(OSSL_LIB_CTX *libctx, |
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return 0; |
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#endif |
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} |
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+ |
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+#ifdef FIPS_MODULE |
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+ if (EVP_MD_is_a(md, "SHAKE-128") || EVP_MD_is_a(md, "SHAKE-256")) { |
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+ ERR_raise(ERR_LIB_RSA, RSA_R_DIGEST_NOT_ALLOWED); |
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+ return 0; |
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+ } |
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+#endif |
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if (mgf1md == NULL) |
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mgf1md = md; |
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|
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+#ifdef FIPS_MODULE |
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+ if (EVP_MD_is_a(mgf1md, "SHAKE-128") || EVP_MD_is_a(mgf1md, "SHAKE-256")) { |
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+ ERR_raise(ERR_LIB_RSA, RSA_R_DIGEST_NOT_ALLOWED); |
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+ return 0; |
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+ } |
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+#endif |
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+ |
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mdlen = EVP_MD_get_size(md); |
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if (mdlen <= 0) { |
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ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_LENGTH); |
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@@ -181,9 +195,23 @@ int RSA_padding_check_PKCS1_OAEP_mgf1(unsigned char *to, int tlen, |
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#endif |
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} |
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|
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+#ifdef FIPS_MODULE |
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+ if (EVP_MD_is_a(md, "SHAKE-128") || EVP_MD_is_a(md, "SHAKE-256")) { |
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+ ERR_raise(ERR_LIB_RSA, RSA_R_DIGEST_NOT_ALLOWED); |
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+ return -1; |
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+ } |
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+#endif |
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+ |
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if (mgf1md == NULL) |
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mgf1md = md; |
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|
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+#ifdef FIPS_MODULE |
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+ if (EVP_MD_is_a(mgf1md, "SHAKE-128") || EVP_MD_is_a(mgf1md, "SHAKE-256")) { |
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+ ERR_raise(ERR_LIB_RSA, RSA_R_DIGEST_NOT_ALLOWED); |
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+ return -1; |
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+ } |
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+#endif |
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+ |
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mdlen = EVP_MD_get_size(md); |
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|
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if (tlen <= 0 || flen <= 0) |
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diff --git a/crypto/rsa/rsa_pss.c b/crypto/rsa/rsa_pss.c |
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index 33874bfef8..e8681b0351 100644 |
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--- a/crypto/rsa/rsa_pss.c |
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+++ b/crypto/rsa/rsa_pss.c |
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@@ -53,6 +53,14 @@ int RSA_verify_PKCS1_PSS_mgf1(RSA *rsa, const unsigned char *mHash, |
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if (mgf1Hash == NULL) |
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mgf1Hash = Hash; |
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|
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+#ifdef FIPS_MODULE |
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+ if (EVP_MD_is_a(Hash, "SHAKE-128") || EVP_MD_is_a(Hash, "SHAKE-256")) |
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+ goto err; |
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+ |
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+ if (EVP_MD_is_a(mgf1Hash, "SHAKE-128") || EVP_MD_is_a(mgf1Hash, "SHAKE-256")) |
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+ goto err; |
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+#endif |
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+ |
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hLen = EVP_MD_get_size(Hash); |
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if (hLen < 0) |
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goto err; |
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@@ -164,6 +172,14 @@ int RSA_padding_add_PKCS1_PSS_mgf1(RSA *rsa, unsigned char *EM, |
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if (mgf1Hash == NULL) |
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mgf1Hash = Hash; |
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|
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+#ifdef FIPS_MODULE |
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+ if (EVP_MD_is_a(Hash, "SHAKE-128") || EVP_MD_is_a(Hash, "SHAKE-256")) |
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+ goto err; |
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+ |
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+ if (EVP_MD_is_a(mgf1Hash, "SHAKE-128") || EVP_MD_is_a(mgf1Hash, "SHAKE-256")) |
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+ goto err; |
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+#endif |
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+ |
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hLen = EVP_MD_get_size(Hash); |
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if (hLen < 0) |
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goto err; |
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-- |
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2.39.0 |
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