image: rsa: Move verification algorithm to a linker list

Move the RSA verification crytpo_algo structure out of the
crypto_algos array, and into a linker list.

Although it appears we are adding an #ifdef to rsa-verify.c, the gains
outweigh this small inconvenience. This is because rsa_verify() is
defined differently based on #ifdefs. This change allows us to have
a single definition of rsa_verify().

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

common/image-sig.c

@@ -52,16 +52,6 @@ struct checksum_algo checksum_algos[] = {
 };
 
 struct crypto_algo crypto_algos[] = {
-	{
-		.name = "rsa2048",
-		.key_len = RSA2048_BYTES,
-		.verify = rsa_verify,
-	},
-	{
-		.name = "rsa4096",
-		.key_len = RSA4096_BYTES,
-		.verify = rsa_verify,
-	},
 };
 
 struct padding_algo padding_algos[] = {

lib/rsa/rsa-verify.c

@@ -571,3 +571,19 @@ int rsa_verify(struct image_sign_info *info,
 
 	return rsa_verify_hash(info, hash, sig, sig_len);
 }
+
+#ifndef USE_HOSTCC
+
+U_BOOT_CRYPTO_ALGO(rsa2048) = {
+	.name = "rsa2048",
+	.key_len = RSA2048_BYTES,
+	.verify = rsa_verify,
+};
+
+U_BOOT_CRYPTO_ALGO(rsa4096) = {
+	.name = "rsa4096",
+	.key_len = RSA4096_BYTES,
+	.verify = rsa_verify,
+};
+
+#endif