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2023-11-20 2e7bd41e4e8ab3d1efdabd9e263a2f7fe79bff8c

 u-boot/lib/rsa/rsa-sign.c
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@@ -610,7 +610,7 @@
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 		   BIGNUM **modulusp, BIGNUM **exponent_BN, BIGNUM **r_squaredp,
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 		   BIGNUM **c_factorp, BIGNUM **np_factorp)
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 {
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-	BIGNUM *big1, *big2, *big32, *big2_32, *big4100, *big2180;
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+	BIGNUM *big1, *big2, *big32, *big2_32, *big4100, *big2180, *big4228;
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 	BIGNUM *n, *e, *r, *r_squared, *tmp, *c_factor, *np_factor;
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 	const BIGNUM *key_n, *key_e;
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 	BN_CTX *bn_ctx = BN_CTX_new();
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@@ -622,6 +622,7 @@
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 	big32 = BN_new();
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 	big4100 = BN_new();
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 	big2180 = BN_new();
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+	big4228 = BN_new();
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 	r = BN_new();
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 	r_squared = BN_new();
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@@ -631,7 +632,7 @@
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 	big2_32 = BN_new();
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 	n = BN_new();
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 	e = BN_new();
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-	if (!big1 || !big2 || !big32 || !big4100 || !big2180 || !r ||
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+	if (!big1 || !big2 || !big32 || !big4100 || !big2180 || !big4228 || !r ||
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 	    !r_squared || !tmp || !big2_32 || !n || !e ||
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 	    !c_factor || !np_factor) {
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 		fprintf(stderr, "Out of memory (bignum)\n");
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@@ -645,7 +646,8 @@
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 	if (!BN_copy(n, key_n) || !BN_copy(e, key_e) ||
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 	    !BN_set_word(big1, 1L) ||
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 	    !BN_set_word(big2, 2L) || !BN_set_word(big32, 32L) ||
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-	    !BN_set_word(big4100, 4100L) || !BN_set_word(big2180, 2180L))
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+	    !BN_set_word(big4100, 4100L) || !BN_set_word(big2180, 2180L) ||
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+	    !BN_set_word(big4228, 4228L))
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 		ret = -1;
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 	/* big2_32 = 2^32 */
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@@ -675,9 +677,15 @@
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 		ret = -1;
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 	/* Calculate np_factor = 2^2180 div n */
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-	if (!BN_exp(tmp, big2, big2180, bn_ctx) ||
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-	    !BN_div(np_factor, NULL, tmp, n, bn_ctx))
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-		ret = -1;
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+	if (BN_num_bits(n) == 2048) {
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+		if (!BN_exp(tmp, big2, big2180, bn_ctx) ||
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+		    !BN_div(np_factor, NULL, tmp, n, bn_ctx))
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+			ret = -1;
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+	} else {/* Calculate 4096 np_factor = 2^4228 div n */
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+		if (!BN_exp(tmp, big2, big4228, bn_ctx) ||
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+		    !BN_div(np_factor, NULL, tmp, n, bn_ctx))
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+			ret = -1;
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+	}
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 	*modulusp = n;
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 	*exponent_BN = e;
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@@ -690,6 +698,7 @@
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 	BN_free(big32);
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 	BN_free(big4100);
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 	BN_free(big2180);
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+	BN_free(big4228);
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 	BN_free(r);
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 	BN_free(tmp);
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 	BN_free(big2_32);