pkey_ctx/set_rsa_keygen_bits: fix ossl <=1.1

Use EVP_PKEY_CTX_set_rsa_keygen_bits macro via EVP_PKEY_CTX_ctrl

Author: huwcbjones

openssl-sys/src/rsa.rs

@@ -7,6 +7,16 @@ pub const RSA_F4: c_long = 0x10001;
 
 cfg_if! {
     if #[cfg(not(ossl300))] {
+        pub unsafe fn EVP_PKEY_CTX_set_rsa_keygen_bits(ctx: *mut EVP_PKEY_CTX, bits: c_int) -> c_int {
+            EVP_PKEY_CTX_ctrl(
+                ctx,
+                EVP_PKEY_RSA,
+                EVP_PKEY_OP_KEYGEN,
+                EVP_PKEY_CTRL_RSA_KEYGEN_BITS,
+                bits,
+                ptr::null_mut(),
+            )
+        }
         pub unsafe fn EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx: *mut EVP_PKEY_CTX, pubexp: *mut BIGNUM) -> c_int {
             EVP_PKEY_CTX_ctrl(
                 ctx,
@@ -92,6 +102,7 @@ pub unsafe fn EVP_PKEY_CTX_set0_rsa_oaep_label(
 
 pub const EVP_PKEY_CTRL_RSA_PADDING: c_int = EVP_PKEY_ALG_CTRL + 1;
 pub const EVP_PKEY_CTRL_RSA_PSS_SALTLEN: c_int = EVP_PKEY_ALG_CTRL + 2;
+pub const EVP_PKEY_CTRL_RSA_KEYGEN_BITS: c_int = EVP_PKEY_ALG_CTRL + 3;
 pub const EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP: c_int = EVP_PKEY_ALG_CTRL + 4;
 
 pub const EVP_PKEY_CTRL_RSA_MGF1_MD: c_int = EVP_PKEY_ALG_CTRL + 5;