| 1 |
From 9cc914ff3e1fda124bdc76d72ebc9349ec19f8ae Mon Sep 17 00:00:00 2001 |
| 2 |
From: Clemens Lang <cllang@redhat.com> |
| 3 |
Date: Fri, 18 Nov 2022 12:35:33 +0100 |
| 4 |
Subject: [PATCH 3/3] signature: Clamp PSS salt len to MD len |
| 5 |
MIME-Version: 1.0 |
| 6 |
Content-Type: text/plain; charset=UTF-8 |
| 7 |
Content-Transfer-Encoding: 8bit |
| 8 |
|
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FIPS 186-4 section 5 "The RSA Digital Signature Algorithm", subsection |
| 10 |
5.5 "PKCS #1" says: "For RSASSA-PSS […] the length (in bytes) of the |
| 11 |
salt (sLen) shall satisfy 0 <= sLen <= hLen, where hLen is the length of |
| 12 |
the hash function output block (in bytes)." |
| 13 |
|
| 14 |
Introduce a new option RSA_PSS_SALTLEN_AUTO_DIGEST_MAX and make it the |
| 15 |
default. The new value will behave like RSA_PSS_SALTLEN_AUTO, but will |
| 16 |
not use more than the digest legth when signing, so that FIPS 186-4 is |
| 17 |
not violated. This value has two advantages when compared with |
| 18 |
RSA_PSS_SALTLEN_DIGEST: (1) It will continue to do auto-detection when |
| 19 |
verifying signatures for maximum compatibility, where |
| 20 |
RSA_PSS_SALTLEN_DIGEST would fail for other digest sizes. (2) It will |
| 21 |
work for combinations where the maximum salt length is smaller than the |
| 22 |
digest size, which typically happens with large digest sizes (e.g., |
| 23 |
SHA-512) and small RSA keys. |
| 24 |
|
| 25 |
Signed-off-by: Clemens Lang <cllang@redhat.com> |
| 26 |
--- |
| 27 |
crypto/rsa/rsa_ameth.c | 18 ++++++++- |
| 28 |
crypto/rsa/rsa_pss.c | 26 ++++++++++-- |
| 29 |
doc/man3/EVP_PKEY_CTX_ctrl.pod | 11 ++++- |
| 30 |
doc/man7/EVP_SIGNATURE-RSA.pod | 5 +++ |
| 31 |
include/openssl/core_names.h | 1 + |
| 32 |
include/openssl/rsa.h | 3 ++ |
| 33 |
providers/implementations/signature/rsa_sig.c | 40 ++++++++++++++----- |
| 34 |
test/recipes/25-test_req.t | 2 +- |
| 35 |
8 files changed, 87 insertions(+), 19 deletions(-) |
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|
| 37 |
diff --git a/crypto/rsa/rsa_ameth.c b/crypto/rsa/rsa_ameth.c |
| 38 |
index 61ec53d424..e69a98d116 100644 |
| 39 |
--- a/crypto/rsa/rsa_ameth.c |
| 40 |
+++ b/crypto/rsa/rsa_ameth.c |
| 41 |
@@ -450,6 +450,7 @@ static RSA_PSS_PARAMS *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx) |
| 42 |
const EVP_MD *sigmd, *mgf1md; |
| 43 |
EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx); |
| 44 |
int saltlen; |
| 45 |
+ int saltlenMax = -1; |
| 46 |
|
| 47 |
if (EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) <= 0) |
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return NULL; |
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@@ -457,14 +458,27 @@ static RSA_PSS_PARAMS *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx) |
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return NULL; |
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if (EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen) <= 0) |
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return NULL; |
| 53 |
- if (saltlen == -1) { |
| 54 |
+ if (saltlen == RSA_PSS_SALTLEN_DIGEST) { |
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saltlen = EVP_MD_get_size(sigmd); |
| 56 |
- } else if (saltlen == -2 || saltlen == -3) { |
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+ } else if (saltlen == RSA_PSS_SALTLEN_AUTO_DIGEST_MAX) { |
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+ /* FIPS 186-4 section 5 "The RSA Digital Signature Algorithm", |
| 59 |
+ * subsection 5.5 "PKCS #1" says: "For RSASSA-PSS […] the length (in |
| 60 |
+ * bytes) of the salt (sLen) shall satisfy 0 <= sLen <= hLen, where |
| 61 |
+ * hLen is the length of the hash function output block (in bytes)." |
| 62 |
+ * |
| 63 |
+ * Provide a way to use at most the digest length, so that the default |
| 64 |
+ * does not violate FIPS 186-4. */ |
| 65 |
+ saltlen = RSA_PSS_SALTLEN_MAX; |
| 66 |
+ saltlenMax = EVP_MD_get_size(sigmd); |
| 67 |
+ } |
| 68 |
+ if (saltlen == RSA_PSS_SALTLEN_MAX || saltlen == RSA_PSS_SALTLEN_AUTO) { |
| 69 |
saltlen = EVP_PKEY_get_size(pk) - EVP_MD_get_size(sigmd) - 2; |
| 70 |
if ((EVP_PKEY_get_bits(pk) & 0x7) == 1) |
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saltlen--; |
| 72 |
if (saltlen < 0) |
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return NULL; |
| 74 |
+ if (saltlenMax >= 0 && saltlen > saltlenMax) |
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+ saltlen = saltlenMax; |
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} |
| 77 |
|
| 78 |
return ossl_rsa_pss_params_create(sigmd, mgf1md, saltlen); |
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diff --git a/crypto/rsa/rsa_pss.c b/crypto/rsa/rsa_pss.c |
| 80 |
index 33874bfef8..430c36eb2a 100644 |
| 81 |
--- a/crypto/rsa/rsa_pss.c |
| 82 |
+++ b/crypto/rsa/rsa_pss.c |
| 83 |
@@ -61,11 +61,12 @@ int RSA_verify_PKCS1_PSS_mgf1(RSA *rsa, const unsigned char *mHash, |
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* -1 sLen == hLen |
| 85 |
* -2 salt length is autorecovered from signature |
| 86 |
* -3 salt length is maximized |
| 87 |
+ * -4 salt length is autorecovered from signature |
| 88 |
* -N reserved |
| 89 |
*/ |
| 90 |
if (sLen == RSA_PSS_SALTLEN_DIGEST) { |
| 91 |
sLen = hLen; |
| 92 |
- } else if (sLen < RSA_PSS_SALTLEN_MAX) { |
| 93 |
+ } else if (sLen < RSA_PSS_SALTLEN_AUTO_DIGEST_MAX) { |
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ERR_raise(ERR_LIB_RSA, RSA_R_SLEN_CHECK_FAILED); |
| 95 |
goto err; |
| 96 |
} |
| 97 |
@@ -112,7 +113,9 @@ int RSA_verify_PKCS1_PSS_mgf1(RSA *rsa, const unsigned char *mHash, |
| 98 |
ERR_raise(ERR_LIB_RSA, RSA_R_SLEN_RECOVERY_FAILED); |
| 99 |
goto err; |
| 100 |
} |
| 101 |
- if (sLen != RSA_PSS_SALTLEN_AUTO && (maskedDBLen - i) != sLen) { |
| 102 |
+ if (sLen != RSA_PSS_SALTLEN_AUTO |
| 103 |
+ && sLen != RSA_PSS_SALTLEN_AUTO_DIGEST_MAX |
| 104 |
+ && (maskedDBLen - i) != sLen) { |
| 105 |
ERR_raise_data(ERR_LIB_RSA, RSA_R_SLEN_CHECK_FAILED, |
| 106 |
"expected: %d retrieved: %d", sLen, |
| 107 |
maskedDBLen - i); |
| 108 |
@@ -160,6 +163,7 @@ int RSA_padding_add_PKCS1_PSS_mgf1(RSA *rsa, unsigned char *EM, |
| 109 |
int hLen, maskedDBLen, MSBits, emLen; |
| 110 |
unsigned char *H, *salt = NULL, *p; |
| 111 |
EVP_MD_CTX *ctx = NULL; |
| 112 |
+ int sLenMax = -1; |
| 113 |
|
| 114 |
if (mgf1Hash == NULL) |
| 115 |
mgf1Hash = Hash; |
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@@ -172,13 +176,25 @@ int RSA_padding_add_PKCS1_PSS_mgf1(RSA *rsa, unsigned char *EM, |
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* -1 sLen == hLen |
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* -2 salt length is maximized |
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* -3 same as above (on signing) |
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+ * -4 salt length is min(hLen, maximum salt length) |
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* -N reserved |
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*/ |
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+ /* FIPS 186-4 section 5 "The RSA Digital Signature Algorithm", subsection |
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+ * 5.5 "PKCS #1" says: "For RSASSA-PSS […] the length (in bytes) of the |
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+ * salt (sLen) shall satisfy 0 <= sLen <= hLen, where hLen is the length of |
| 126 |
+ * the hash function output block (in bytes)." |
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+ * |
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+ * Provide a way to use at most the digest length, so that the default does |
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+ * not violate FIPS 186-4. */ |
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if (sLen == RSA_PSS_SALTLEN_DIGEST) { |
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sLen = hLen; |
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- } else if (sLen == RSA_PSS_SALTLEN_MAX_SIGN) { |
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+ } else if (sLen == RSA_PSS_SALTLEN_MAX_SIGN |
| 134 |
+ || sLen == RSA_PSS_SALTLEN_AUTO) { |
| 135 |
sLen = RSA_PSS_SALTLEN_MAX; |
| 136 |
- } else if (sLen < RSA_PSS_SALTLEN_MAX) { |
| 137 |
+ } else if (sLen == RSA_PSS_SALTLEN_AUTO_DIGEST_MAX) { |
| 138 |
+ sLen = RSA_PSS_SALTLEN_MAX; |
| 139 |
+ sLenMax = hLen; |
| 140 |
+ } else if (sLen < RSA_PSS_SALTLEN_AUTO_DIGEST_MAX) { |
| 141 |
ERR_raise(ERR_LIB_RSA, RSA_R_SLEN_CHECK_FAILED); |
| 142 |
goto err; |
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} |
| 144 |
@@ -195,6 +211,8 @@ int RSA_padding_add_PKCS1_PSS_mgf1(RSA *rsa, unsigned char *EM, |
| 145 |
} |
| 146 |
if (sLen == RSA_PSS_SALTLEN_MAX) { |
| 147 |
sLen = emLen - hLen - 2; |
| 148 |
+ if (sLenMax >= 0 && sLen > sLenMax) |
| 149 |
+ sLen = sLenMax; |
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} else if (sLen > emLen - hLen - 2) { |
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ERR_raise(ERR_LIB_RSA, RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); |
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goto err; |
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diff --git a/doc/man3/EVP_PKEY_CTX_ctrl.pod b/doc/man3/EVP_PKEY_CTX_ctrl.pod |
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index 3075eaafd6..9b96f42dbc 100644 |
| 155 |
--- a/doc/man3/EVP_PKEY_CTX_ctrl.pod |
| 156 |
+++ b/doc/man3/EVP_PKEY_CTX_ctrl.pod |
| 157 |
@@ -270,8 +270,8 @@ EVP_PKEY_CTX_get_rsa_padding() gets the RSA padding mode for I<ctx>. |
| 158 |
|
| 159 |
EVP_PKEY_CTX_set_rsa_pss_saltlen() sets the RSA PSS salt length to I<saltlen>. |
| 160 |
As its name implies it is only supported for PSS padding. If this function is |
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-not called then the maximum salt length is used when signing and auto detection |
| 162 |
-when verifying. Three special values are supported: |
| 163 |
+not called then the salt length is maximized up to the digest length when |
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+signing and auto detection when verifying. Four special values are supported: |
| 165 |
|
| 166 |
=over 4 |
| 167 |
|
| 168 |
@@ -289,6 +289,13 @@ causes the salt length to be automatically determined based on the |
| 169 |
B<PSS> block structure when verifying. When signing, it has the same |
| 170 |
meaning as B<RSA_PSS_SALTLEN_MAX>. |
| 171 |
|
| 172 |
+=item B<RSA_PSS_SALTLEN_AUTO_DIGEST_MAX> |
| 173 |
+ |
| 174 |
+causes the salt length to be automatically determined based on the B<PSS> block |
| 175 |
+structure when verifying, like B<RSA_PSS_SALTLEN_AUTO>. When signing, the salt |
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+length is maximized up to a maximum of the digest length to comply with FIPS |
| 177 |
+186-4 section 5.5. |
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+ |
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=back |
| 180 |
|
| 181 |
EVP_PKEY_CTX_get_rsa_pss_saltlen() gets the RSA PSS salt length for I<ctx>. |
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diff --git a/doc/man7/EVP_SIGNATURE-RSA.pod b/doc/man7/EVP_SIGNATURE-RSA.pod |
| 183 |
index 1ce32cc443..13d053e262 100644 |
| 184 |
--- a/doc/man7/EVP_SIGNATURE-RSA.pod |
| 185 |
+++ b/doc/man7/EVP_SIGNATURE-RSA.pod |
| 186 |
@@ -68,6 +68,11 @@ Use the maximum salt length. |
| 187 |
|
| 188 |
Auto detect the salt length. |
| 189 |
|
| 190 |
+=item "auto-digestmax" (B<OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO_DIGEST_MAX>) |
| 191 |
+ |
| 192 |
+Auto detect the salt length when verifying. Maximize the salt length up to the |
| 193 |
+digest size when signing to comply with FIPS 186-4 section 5.5. |
| 194 |
+ |
| 195 |
=back |
| 196 |
|
| 197 |
=back |
| 198 |
diff --git a/include/openssl/core_names.h b/include/openssl/core_names.h |
| 199 |
index 69c59f0b46..5779f41427 100644 |
| 200 |
--- a/include/openssl/core_names.h |
| 201 |
+++ b/include/openssl/core_names.h |
| 202 |
@@ -399,6 +399,7 @@ extern "C" { |
| 203 |
#define OSSL_PKEY_RSA_PSS_SALT_LEN_DIGEST "digest" |
| 204 |
#define OSSL_PKEY_RSA_PSS_SALT_LEN_MAX "max" |
| 205 |
#define OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO "auto" |
| 206 |
+#define OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO_DIGEST_MAX "auto-digestmax" |
| 207 |
|
| 208 |
/* Key generation parameters */ |
| 209 |
#define OSSL_PKEY_PARAM_RSA_BITS OSSL_PKEY_PARAM_BITS |
| 210 |
diff --git a/include/openssl/rsa.h b/include/openssl/rsa.h |
| 211 |
index a55c9727c6..daf55bc6d4 100644 |
| 212 |
--- a/include/openssl/rsa.h |
| 213 |
+++ b/include/openssl/rsa.h |
| 214 |
@@ -137,6 +137,9 @@ int EVP_PKEY_CTX_set_rsa_keygen_pubexp(EVP_PKEY_CTX *ctx, BIGNUM *pubexp); |
| 215 |
# define RSA_PSS_SALTLEN_AUTO -2 |
| 216 |
/* Set salt length to maximum possible */ |
| 217 |
# define RSA_PSS_SALTLEN_MAX -3 |
| 218 |
+/* Auto-detect on verify, set salt length to min(maximum possible, digest |
| 219 |
+ * length) on sign */ |
| 220 |
+# define RSA_PSS_SALTLEN_AUTO_DIGEST_MAX -4 |
| 221 |
/* Old compatible max salt length for sign only */ |
| 222 |
# define RSA_PSS_SALTLEN_MAX_SIGN -2 |
| 223 |
|
| 224 |
diff --git a/providers/implementations/signature/rsa_sig.c b/providers/implementations/signature/rsa_sig.c |
| 225 |
index 0c45008a00..1a787d77db 100644 |
| 226 |
--- a/providers/implementations/signature/rsa_sig.c |
| 227 |
+++ b/providers/implementations/signature/rsa_sig.c |
| 228 |
@@ -191,8 +191,8 @@ static void *rsa_newctx(void *provctx, const char *propq) |
| 229 |
prsactx->libctx = PROV_LIBCTX_OF(provctx); |
| 230 |
prsactx->flag_allow_md = 1; |
| 231 |
prsactx->propq = propq_copy; |
| 232 |
- /* Maximum for sign, auto for verify */ |
| 233 |
- prsactx->saltlen = RSA_PSS_SALTLEN_AUTO; |
| 234 |
+ /* Maximum up to digest length for sign, auto for verify */ |
| 235 |
+ prsactx->saltlen = RSA_PSS_SALTLEN_AUTO_DIGEST_MAX; |
| 236 |
prsactx->min_saltlen = -1; |
| 237 |
return prsactx; |
| 238 |
} |
| 239 |
@@ -200,13 +200,27 @@ static void *rsa_newctx(void *provctx, const char *propq) |
| 240 |
static int rsa_pss_compute_saltlen(PROV_RSA_CTX *ctx) |
| 241 |
{ |
| 242 |
int saltlen = ctx->saltlen; |
| 243 |
- |
| 244 |
+ int saltlenMax = -1; |
| 245 |
+ |
| 246 |
+ /* FIPS 186-4 section 5 "The RSA Digital Signature Algorithm", subsection |
| 247 |
+ * 5.5 "PKCS #1" says: "For RSASSA-PSS […] the length (in bytes) of the |
| 248 |
+ * salt (sLen) shall satisfy 0 <= sLen <= hLen, where hLen is the length of |
| 249 |
+ * the hash function output block (in bytes)." |
| 250 |
+ * |
| 251 |
+ * Provide a way to use at most the digest length, so that the default does |
| 252 |
+ * not violate FIPS 186-4. */ |
| 253 |
if (saltlen == RSA_PSS_SALTLEN_DIGEST) { |
| 254 |
saltlen = EVP_MD_get_size(ctx->md); |
| 255 |
- } else if (saltlen == RSA_PSS_SALTLEN_AUTO || saltlen == RSA_PSS_SALTLEN_MAX) { |
| 256 |
+ } else if (saltlen == RSA_PSS_SALTLEN_AUTO_DIGEST_MAX) { |
| 257 |
+ saltlen = RSA_PSS_SALTLEN_MAX; |
| 258 |
+ saltlenMax = EVP_MD_get_size(ctx->md); |
| 259 |
+ } |
| 260 |
+ if (saltlen == RSA_PSS_SALTLEN_MAX || saltlen == RSA_PSS_SALTLEN_AUTO) { |
| 261 |
saltlen = RSA_size(ctx->rsa) - EVP_MD_get_size(ctx->md) - 2; |
| 262 |
if ((RSA_bits(ctx->rsa) & 0x7) == 1) |
| 263 |
saltlen--; |
| 264 |
+ if (saltlenMax >= 0 && saltlen > saltlenMax) |
| 265 |
+ saltlen = saltlenMax; |
| 266 |
} |
| 267 |
if (saltlen < 0) { |
| 268 |
ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR); |
| 269 |
@@ -411,8 +425,8 @@ static int rsa_signverify_init(void *vprsactx, void *vrsa, |
| 270 |
|
| 271 |
prsactx->operation = operation; |
| 272 |
|
| 273 |
- /* Maximum for sign, auto for verify */ |
| 274 |
- prsactx->saltlen = RSA_PSS_SALTLEN_AUTO; |
| 275 |
+ /* Maximize up to digest length for sign, auto for verify */ |
| 276 |
+ prsactx->saltlen = RSA_PSS_SALTLEN_AUTO_DIGEST_MAX; |
| 277 |
prsactx->min_saltlen = -1; |
| 278 |
|
| 279 |
switch (RSA_test_flags(prsactx->rsa, RSA_FLAG_TYPE_MASK)) { |
| 280 |
@@ -1110,6 +1124,9 @@ static int rsa_get_ctx_params(void *vprsactx, OSSL_PARAM *params) |
| 281 |
case RSA_PSS_SALTLEN_AUTO: |
| 282 |
value = OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO; |
| 283 |
break; |
| 284 |
+ case RSA_PSS_SALTLEN_AUTO_DIGEST_MAX: |
| 285 |
+ value = OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO_DIGEST_MAX; |
| 286 |
+ break; |
| 287 |
default: |
| 288 |
{ |
| 289 |
int len = BIO_snprintf(p->data, p->data_size, "%d", |
| 290 |
@@ -1297,6 +1314,8 @@ static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[]) |
| 291 |
saltlen = RSA_PSS_SALTLEN_MAX; |
| 292 |
else if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO) == 0) |
| 293 |
saltlen = RSA_PSS_SALTLEN_AUTO; |
| 294 |
+ else if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO_DIGEST_MAX) == 0) |
| 295 |
+ saltlen = RSA_PSS_SALTLEN_AUTO_DIGEST_MAX; |
| 296 |
else |
| 297 |
saltlen = atoi(p->data); |
| 298 |
break; |
| 299 |
@@ -1305,11 +1324,11 @@ static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[]) |
| 300 |
} |
| 301 |
|
| 302 |
/* |
| 303 |
- * RSA_PSS_SALTLEN_MAX seems curiously named in this check. |
| 304 |
- * Contrary to what it's name suggests, it's the currently |
| 305 |
- * lowest saltlen number possible. |
| 306 |
+ * RSA_PSS_SALTLEN_AUTO_DIGEST_MAX seems curiously named in this check. |
| 307 |
+ * Contrary to what it's name suggests, it's the currently lowest |
| 308 |
+ * saltlen number possible. |
| 309 |
*/ |
| 310 |
- if (saltlen < RSA_PSS_SALTLEN_MAX) { |
| 311 |
+ if (saltlen < RSA_PSS_SALTLEN_AUTO_DIGEST_MAX) { |
| 312 |
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH); |
| 313 |
return 0; |
| 314 |
} |
| 315 |
@@ -1317,6 +1336,7 @@ static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[]) |
| 316 |
if (rsa_pss_restricted(prsactx)) { |
| 317 |
switch (saltlen) { |
| 318 |
case RSA_PSS_SALTLEN_AUTO: |
| 319 |
+ case RSA_PSS_SALTLEN_AUTO_DIGEST_MAX: |
| 320 |
if (prsactx->operation == EVP_PKEY_OP_VERIFY) { |
| 321 |
ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH, |
| 322 |
"Cannot use autodetected salt length"); |
| 323 |
diff --git a/test/recipes/25-test_req.t b/test/recipes/25-test_req.t |
| 324 |
index e615f1b338..35541aed12 100644 |
| 325 |
--- a/test/recipes/25-test_req.t |
| 326 |
+++ b/test/recipes/25-test_req.t |
| 327 |
@@ -199,7 +199,7 @@ subtest "generating certificate requests with RSA-PSS" => sub { |
| 328 |
ok(!run(app(["openssl", "req", |
| 329 |
"-config", srctop_file("test", "test.cnf"), |
| 330 |
"-new", "-out", "testreq-rsapss3.pem", "-utf8", |
| 331 |
- "-sigopt", "rsa_pss_saltlen:-4", |
| 332 |
+ "-sigopt", "rsa_pss_saltlen:-5", |
| 333 |
"-key", srctop_file("test", "testrsapss.pem")])), |
| 334 |
"Generating request with expected failure"); |
| 335 |
|
| 336 |
-- |
| 337 |
2.38.1 |
| 338 |
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