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Defines and strings for special salt length values, add tests

Browse source 
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2236)
This commit is contained in:
Dr. Stephen Henson 2017-01-17 17:51:24 +00:00
parent 3c441c2eb7
commit 137096a7ea
8 changed files with 65 additions and 33 deletions
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2
crypto/rsa/rsa_ameth.c
View file

@ -540,7 +540,7 @@ static RSA_PSS_PARAMS *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx)
saltlen = EVP_MD_size(sigmd);
else if (saltlen == -2) {
saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
if (((EVP_PKEY_bits(pk) - 1) & 0x7) == 0)
if ((EVP_PKEY_bits(pk) & 0x7) == 1)
saltlen--;
}

18
crypto/rsa/rsa_pmeth.c
View file

@ -58,7 +58,8 @@ static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
rctx->pad_mode = RSA_PKCS1_PSS_PADDING;
else
rctx->pad_mode = RSA_PKCS1_PADDING;
rctx->saltlen = -2;
/* Maximum for sign, auto for verify */
rctx->saltlen = RSA_PSS_SALTLEN_AUTO;
rctx->min_saltlen = -1;
ctx->data = rctx;
ctx->keygen_info = rctx->gentmp;
@ -430,14 +431,16 @@ static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN) {
*(int *)p2 = rctx->saltlen;
} else {
if (p1 < -2)
if (p1 < RSA_PSS_SALTLEN_MAX)
return -2;
if (rsa_pss_restricted(rctx)) {
if (p1 == -2 && ctx->operation == EVP_PKEY_OP_VERIFY) {
if (p1 == RSA_PSS_SALTLEN_AUTO
&& ctx->operation == EVP_PKEY_OP_VERIFY) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
return -2;
}
if ((p1 == -1 && rctx->min_saltlen > EVP_MD_size(rctx->md))
if ((p1 == RSA_PSS_SALTLEN_DIGEST
&& rctx->min_saltlen > EVP_MD_size(rctx->md))
|| (p1 >= 0 && p1 < rctx->min_saltlen)) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_PSS_SALTLEN_TOO_SMALL);
return 0;
@ -596,6 +599,13 @@ static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
if (strcmp(type, "rsa_pss_saltlen") == 0) {
int saltlen;
if (!strcmp(value, "digest"))
saltlen = RSA_PSS_SALTLEN_DIGEST;
else if (!strcmp(value, "max"))
saltlen = RSA_PSS_SALTLEN_MAX;
else if (!strcmp(value, "auto"))
saltlen = RSA_PSS_SALTLEN_AUTO;
else
saltlen = atoi(value);
return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
}

23
crypto/rsa/rsa_pss.c
View file

@ -41,7 +41,6 @@ int RSA_verify_PKCS1_PSS_mgf1(RSA *rsa, const unsigned char *mHash,
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
unsigned char H_[EVP_MAX_MD_SIZE];
if (ctx == NULL)
goto err;
@ -57,11 +56,9 @@ int RSA_verify_PKCS1_PSS_mgf1(RSA *rsa, const unsigned char *mHash,
* -2 salt length is autorecovered from signature
* -N reserved
*/
if (sLen == -1)
if (sLen == RSA_PSS_SALTLEN_DIGEST)
sLen = hLen;
else if (sLen == -2)
sLen = -2;
else if (sLen < -2) {
else if (sLen < RSA_PSS_SALTLEN_MAX) {
RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED);
goto err;
}
@ -76,7 +73,9 @@ int RSA_verify_PKCS1_PSS_mgf1(RSA *rsa, const unsigned char *mHash,
EM++;
emLen--;
}
if (emLen < (hLen + sLen + 2)) { /* sLen can be small negative */
if (sLen == RSA_PSS_SALTLEN_MAX) {
sLen = emLen - hLen - 2;
} else if (emLen < (hLen + sLen + 2)) { /* sLen can be small negative */
RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_DATA_TOO_LARGE);
goto err;
}
@ -102,7 +101,7 @@ int RSA_verify_PKCS1_PSS_mgf1(RSA *rsa, const unsigned char *mHash,
RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_RECOVERY_FAILED);
goto err;
}
if (sLen >= 0 && (maskedDBLen - i) != sLen) {
if (sLen != RSA_PSS_SALTLEN_AUTO && (maskedDBLen - i) != sLen) {
RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED);
goto err;
}
@ -160,11 +159,11 @@ int RSA_padding_add_PKCS1_PSS_mgf1(RSA *rsa, unsigned char *EM,
* -2 salt length is maximized
* -N reserved
*/
if (sLen == -1)
if (sLen == RSA_PSS_SALTLEN_DIGEST)
sLen = hLen;
else if (sLen == -2)
sLen = -2;
else if (sLen < -2) {
else if (sLen == RSA_PSS_SALTLEN_MAX_SIGN)
sLen = RSA_PSS_SALTLEN_MAX;
else if (sLen < RSA_PSS_SALTLEN_MAX) {
RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED);
goto err;
}
@ -175,7 +174,7 @@ int RSA_padding_add_PKCS1_PSS_mgf1(RSA *rsa, unsigned char *EM,
*EM++ = 0;
emLen--;
}
if (sLen == -2) {
if (sLen == RSA_PSS_SALTLEN_MAX) {
sLen = emLen - hLen - 2;
} else if (emLen < (hLen + sLen + 2)) {
RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1,

10
doc/man1/pkeyutl.pod
View file

@ -215,11 +215,11 @@ specified.
=item B<rsa_pss_saltlen:len>
For B<pss> mode only this option specifies the salt length. Two special values
are supported: -1 sets the salt length to the digest length. When signing -2
sets the salt length to the maximum permissible value. When verifying -2 causes
the salt length to be automatically determined based on the B<PSS> block
structure.
For B<pss> mode only this option specifies the salt length. Three special
values are supported: "digest" sets the salt length to the digest length,
"max" sets the salt length to the maximum permissible value. When verifying
"auto" causes the salt length to be automatically determined based on the
B<PSS> block structure.
=item B<rsa_mgf1_md:digest>

13
doc/man3/EVP_PKEY_CTX_ctrl.pod
View file

@ -82,12 +82,13 @@ if this control is called. If it is not called then the first byte of the plaint
buffer is expected to be the algorithm identifier byte.
The EVP_PKEY_CTX_set_rsa_pss_saltlen() macro sets the RSA PSS salt length to
B<len> as its name implies it is only supported for PSS padding. Two special
values are supported: -1 sets the salt length to the digest length. When
signing -2 sets the salt length to the maximum permissible value. When
verifying -2 causes the salt length to be automatically determined based on the
B<PSS> block structure. If this macro is not called a salt length value of -2
is used by default.
B<len> as its name implies it is only supported for PSS padding. Three special
values are supported: RSA_PSS_SALTLEN_DIGEST sets the salt length to the
digest length, RSA_PSS_SALTLEN_MAX sets the salt length to the maximum
permissible value. When verifying RSA_PSS_SALTLEN_AUTO causes the salt length
to be automatically determined based on the B<PSS> block structure. If this
macro is not called maximum salt length is used when signing and auto detection
when verifying is used by default.
The EVP_PKEY_CTX_set_rsa_rsa_keygen_bits() macro sets the RSA key length for
RSA key generation to B<bits>. If not specified 1024 bits is used.

5
doc/man3/EVP_PKEY_CTX_set_rsa_pss_keygen_md.pod
View file

@ -44,8 +44,9 @@ than B<PSS>. It is otherwise similar to the B<RSA> version.
The EVP_PKEY_CTX_set_rsa_pss_saltlen() macro is used to set the salt length.
If the key has usage restrictions then an error is returned if an attempt is
made to set the salt length below the minimum value. It is otherwise similar
to the B<RSA> operation except detection of the salt length (using -2) is
not supported for verification if the key has usage restrictions.
to the B<RSA> operation except detection of the salt length (using
RSA_PSS_SALTLEN_AUTO is not supported for verification if the key has
usage restrictions.
The EVP_PKEY_CTX_set_signature_md() and EVP_PKEY_CTX_set_rsa_mgf1_md() macros
are used to set the digest and MGF1 algorithms respectively. If the key has

8
include/openssl/rsa.h
View file

@ -94,6 +94,14 @@ extern "C" {
# define EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, len) \
RSA_pkey_ctx_ctrl(ctx, (EVP_PKEY_OP_SIGN|EVP_PKEY_OP_VERIFY), \
EVP_PKEY_CTRL_RSA_PSS_SALTLEN, len, NULL)
/* Salt length matches digest */
# define RSA_PSS_SALTLEN_DIGEST -1
/* Verify only: auto detect salt length */
# define RSA_PSS_SALTLEN_AUTO -2
/* Set salt length to maximum possible */
# define RSA_PSS_SALTLEN_MAX -3
/* Old compatible max salt length for sign only */
# define RSA_PSS_SALTLEN_MAX_SIGN -2
# define EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(ctx, len) \
EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA_PSS, EVP_PKEY_OP_KEYGEN, \

17
test/evptests.txt
View file

@ -2931,6 +2931,13 @@ Ctrl = digest:sha256
Input="0123456789ABCDEF0123456789ABCDEF"
Output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
# Verify using salt length auto detect
Verify = RSA-2048-PUBLIC
Ctrl = rsa_padding_mode:pss
Ctrl = rsa_pss_saltlen:auto
Input="0123456789ABCDEF0123"
Output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
# Digest too short
Verify = RSA-2048-PUBLIC
Ctrl = rsa_padding_mode:pss
@ -3049,10 +3056,10 @@ Ctrl = digest:sha1
Input="0123456789ABCDEF0123"
Output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
# Verify using default parameters, explicitly setting parameters -1 salt length
# Verify explicitly setting parameters "digest" salt length
Verify = RSA-PSS-DEFAULT
Ctrl = rsa_padding_mode:pss
Ctrl = rsa_pss_saltlen:-1
Ctrl = rsa_pss_saltlen:digest
Ctrl = digest:sha1
Input="0123456789ABCDEF0123"
Output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
@ -3063,6 +3070,12 @@ Ctrl = rsa_pss_saltlen:30
Input="0123456789ABCDEF0123"
Output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
# Verify using maximum salt length
Verify = RSA-PSS-DEFAULT
Ctrl = rsa_pss_saltlen:max
Input="0123456789ABCDEF0123"
Output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
# Attempt to change salt length below minimum
Verify = RSA-PSS-DEFAULT
Ctrl = rsa_pss_saltlen:0