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crypto: rsa-pkcs1pad: export rsa1_asn_lookup()

PATCH Superseded Jarkko Sakkinen 1 participant 1 message May 15, 2024

Subsystems (3)
Crypto API Keys-trusted Asymmetric keys - rsa

v1 of 2 Superseded Latest is v2 →

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Jarkko Sakkinen

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PATCH 1/1 crypto: rsa-pkcs1pad: export rsa1_asn_lookup()

ASN.1 template is required for TPM2 asymmetric keys, as it needs to be piggy-packed with the input data before applying TPM2_RSA_Decrypt. This patch prepares crypto subsystem for the addition of those keys.

Later rsa_lookup_asn1() can be enabled in crypto/asymmetric_keys/Kconfig by:

depends on CRYPTO_RSA >= <TPM2 asymmetric keys>

Cc James Prestwood <[email protected]>
Signed-off-by Jarkko Sakkinen <[email protected]>
---
 crypto/rsa-pkcs1pad.c         | 10 +++++++++-
 include/crypto/rsa-pkcs1pad.h | 11 +++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 include/crypto/rsa-pkcs1pad.h
crypto/rsa-pkcs1pad.c +9 -1
index cd501195f34a..a07ccf179f56 100644
@@ -7,6 +7,7 @@
 
 #include <crypto/algapi.h>
 #include <crypto/akcipher.h>
+#include <crypto/rsa-pkcs1pad.h>
 #include <crypto/internal/akcipher.h>
 #include <crypto/internal/rsa.h>
 #include <linux/err.h>

@@ -101,7 +102,13 @@ static const struct rsa_asn1_template {
 	{ NULL }
 };
 
-static const struct rsa_asn1_template *rsa_lookup_asn1(const char *name)
+/**
+ * rsa_lookup_asn1() - Lookup the ASN.1 digest info given the hash
+ * name:	hash algorithm name
+ *
+ * Returns theu ASN.1 digest info on success, and NULL on failure.
+ */
+const struct rsa_asn1_template *rsa_lookup_asn1(const char *name)
 {
 	const struct rsa_asn1_template *p;
 

@@ -110,6 +117,7 @@ static const struct rsa_asn1_template *rsa_lookup_asn1(const char *name)
 			return p;
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(rsa_lookup_asn1);
 
 struct pkcs1pad_ctx {
 	struct crypto_akcipher *child;
include/crypto/rsa-pkcs1pad.h new file +11 -0
new file mode 100644
index 000000000000..9881fa23d0dd
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * RSA padding templates.
+ */
+
+#ifndef _CRYPTO_RSA_PKCS1PAD_H
+#define _CRYPTO_RSA_PKCS1PAD_H
+
+const struct rsa_asn1_template *rsa_lookup_asn1(const char *name);
+
+#endif /* _CRYPTO_RSA_PKCS1PAD_H */
Signature · 1 line
2.45.0