diff --git a/src/rsa/import_key.ts b/src/rsa/import_key.ts
index 7021fed..377f8ee 100644
--- a/src/rsa/import_key.ts
+++ b/src/rsa/import_key.ts
@@ -57,7 +57,7 @@ function rsa_import_jwk(key: JSONWebKey): RSAKeyParams {
  * @param key
  */
 function rsa_import_pem_cert(key: string): RSAKeyParams {
-  const trimmedKey = key.substr(27, key.length - 53);
+  const trimmedKey = key.substr(27, key.length - 52);
   const parseKey = ber_simple(
     ber_decode(base64_to_binary(trimmedKey)),
   ) as RSACertKeyFormat;
@@ -76,7 +76,7 @@ function rsa_import_pem_cert(key: string): RSAKeyParams {
  * @param key PEM encoded key format
  */
 function rsa_import_pem_private(key: string): RSAKeyParams {
-  const trimmedKey = key.substr(31, key.length - 61);
+  const trimmedKey = key.substr(31, key.length - 60);
   const parseKey = ber_simple(
     ber_decode(base64_to_binary(trimmedKey)),
   ) as bigint[];
@@ -101,7 +101,7 @@ function rsa_import_pem_private(key: string): RSAKeyParams {
  * @param key PEM encoded key format
  */
 function rsa_import_pem_private_pkcs8(key: string): RSAKeyParams {
-  const trimmedKey = key.substr(27, key.length - 57);
+  const trimmedKey = key.substr(27, key.length - 52);
   const parseWrappedKey = ber_simple(
     ber_decode(base64_to_binary(trimmedKey)),
   ) as [number, unknown, Uint8Array];
@@ -128,7 +128,7 @@ function rsa_import_pem_private_pkcs8(key: string): RSAKeyParams {
  * @param key PEM encoded key format
  */
 function rsa_import_pem_public(key: string): RSAKeyParams {
-  const trimmedKey = key.substr(26, key.length - 51);
+  const trimmedKey = key.substr(26, key.length - 50);
   const parseKey = ber_simple(
     ber_decode(base64_to_binary(trimmedKey)),
   ) as RSAPublicKeyFormat;
diff --git a/tests/rsa/rsa.import_key.test.ts b/tests/rsa/rsa.import_key.test.ts
index e8d5915..2d9452c 100644
--- a/tests/rsa/rsa.import_key.test.ts
+++ b/tests/rsa/rsa.import_key.test.ts
@@ -86,9 +86,12 @@ Deno.test("RSA - Import Private Key (PKCS8)", () => {
   const e = 65537n;
   const d =
     675889233296421535959584534071325460876697008626327098961835826056666939623318583538247287416696388446697983317835135300723690022117970081796395234018582764098060974026823771341271141202058228435371968592820841644512299636165137501280011132877728106486853881053264668544941537620562475421678333757690909726581512579603702598150422421865490996288244127528474781858718770957987603681469839575489191876915053252047160475432784849252000744700939988583801783684487872676506769116621572018367654125765915215495461243190782913460732307866572233187464540482209385816659449697777403383908159076257721991916366849321145825505n;
+  const qi =
+    74289828655732991195558689791424564707132679819891037249694826356870666658448134417270855397604232230569020096065966539928979441113025455296436655960522783579897346034371763410999278044050901737497683356751868229820180356905837023964589114523481066796348442538273820591008174072287844578937802915493303718997n;
   assertEquals(key.e, e);
   assertEquals(key.n, n);
   assertEquals(key.d, d);
+  assertEquals(key.qi, qi);
   assertEquals(key.length, 256);
 
   // Testing key with trailing newline
@@ -97,3 +100,47 @@ Deno.test("RSA - Import Private Key (PKCS8)", () => {
   assertEquals(key2.n, n);
   assertEquals(key2.d, d);
 });
+
+Deno.test("RSA - Import RSA Private Key (PEM)", () => {
+  const raw = `-----BEGIN RSA PRIVATE KEY-----
+  MIIEowIBAAKCAQEAlWeqIOFxsSwBx2cB5tuwLVDD+vvMBapZb7qdE69FdtWL8cz8
+  Vo2r9vpiziDPLqWu6c73KXORIgh+fHXp5iybMoKqNK9gfFocx2PqwiFiX1dmEmcY
+  86b0gB38yyaw6YV4KoJwjcRI0bLsgmAIhiyDCtIbmPdAOTDDAK4FM5MfJDHf36vx
+  nfV7eYiPhezZcpSfmq5yXN9OqYBhytzTdhgV9b50rggdvNElF5GX0wXspMg2emKw
+  KtF6ZwjVfSch6i0OBJoxIXNslKN2jUclzTAXXWcdxwixXMcGQlQKdLUJAHexK7FA
+  +T+Q0fESCd365JUlFGQehJA8PBuyi1ilXDUNhQIDAQABAoIBAAVapJjkOLNj85YJ
+  Aw3aH8SRS/ioVzMjxpaPrjXd9oQP7+GE2k0iwL/Le3N4xFv0VuHs8g64+Ww/YthZ
+  zxLvKcpOru6k6J+u3gWnjGqTu4dVpeQxGs6Oft1sKwU/uCAiPEBvvLyuhPqI1Ntw
+  5BVPg+Gvzl/gtRs85rFqoGfs/4pyi2jMEuq7FkTlJYANceczUqKgt0iRZZVV13sO
+  VMgDU7AY70OSdjJm/YPAhGgDp/sTJMTZcE5Q6LftPZxSfb7wFoq1JGXbGDZ5WPs6
+  w0KD0+wJuY7Skx5jCNSn1jX5s58o4kZbXZ1n3fAYNB+1bcK4VjFhrPEJAE1ABPnw
+  t6kteOECgYEAzRS5PHjMCupKDKDZmL7EQH9WOl3Xfi1DfkyapGYlBMkmisvDS4u9
+  SAW8yu8yqm2Fwz1BQmzSRYTpZbijsG7Cj5MAY0dCX6F1c21HRPtrTNmHHLMGiXu4
+  op2ca9MBxlyLyS9BzVSM5jYIEu/mZqxLHQshV500//N6NcFVtxP5bKUCgYEAuoAV
+  cmAj+wMWB00kQwoHKbEzux8s7mPdrWmDoUSRQuxzW8yW1XVbH527UB/xKXvMkpPd
+  RshWdXUia8XrXC4R7EtkzK5GFJmOMWyZ6syU4e3IFgT/Q7lmL0icT6KEqRcG4di9
+  dr0NgA6cMKAGTC5AGoGhpWPTGc/NtV2PipDi52ECgYEAkOPZU04M6pFIq89grLfq
+  s57Dbw0p2G1mR+8bOpcoBE+ROXJokhEyM5ZKIh4I77vdS2kVmDaGALO8qi9fBqHa
+  N9Gl7n5D+Ih8EIbeWXBACNWOzcn2DmAovEsaXlt/34M3B3apyMW5nlQCNE7luxhz
+  IRvh/KKG9WYxq5TiWCx2hjkCgYAyzr4JAMQMmBSiPJPKZ6r34ryTF7Un5LD5kys2
+  /fUM5FmxApV85ZHDlTb4ZxtOD9n1fK7ln6JeMWEFN1AdNrfPReLaGAgjiInCUTHF
+  U6KjwiGmTgo0qwd5jjB3SXEWl51aXa+P74UEA/btEEtm6ZqxHeupoP5bo88Iv8ph
+  F4OZQQKBgGnKz25Q/hvwwJk1Ld7WcBi3SL8OAXg8gr88ZCcdWdOKzGR+9RBMgQzz
+  AQcmTT7Y6U7s4AGRO9TIg9wVS8Y/x3ahI1FUEo7jlMoiSnuRohhduV4Xt/9VWsLq
+  wnR367+l5s3vpUQx2bhDnFdRazPs5ykF5ZKT2y95VNgqYBhRSpRV
+  -----END RSA PRIVATE KEY-----`;
+  const key = RSA.importKey(raw);
+  const n =
+    18860626341786571281488823024986320858450594409825894653370543036132043241142573896042059032222842653925236802058387508300831766517210547599910735316414515960981281788934868325895562621846910598716519620622800765932541992515497122274302135166053720433521886017494719475895327062855822141735315456613329660043977602681873027347568355824008701177948209784908095092287571982104446342906805480285143028837509076748632094733769028381835899214426100089454654381383340292544225149266603150745375542089871264998183586873913491071542891188124185517417658034185267204900711933432911892469528812455677450346478816563776340692357n;
+
+  const e = 65537n;
+  const d =
+    675889233296421535959584534071325460876697008626327098961835826056666939623318583538247287416696388446697983317835135300723690022117970081796395234018582764098060974026823771341271141202058228435371968592820841644512299636165137501280011132877728106486853881053264668544941537620562475421678333757690909726581512579603702598150422421865490996288244127528474781858718770957987603681469839575489191876915053252047160475432784849252000744700939988583801783684487872676506769116621572018367654125765915215495461243190782913460732307866572233187464540482209385816659449697777403383908159076257721991916366849321145825505n;
+  const qi =
+    74289828655732991195558689791424564707132679819891037249694826356870666658448134417270855397604232230569020096065966539928979441113025455296436655960522783579897346034371763410999278044050901737497683356751868229820180356905837023964589114523481066796348442538273820591008174072287844578937802915493303718997n;
+  assertEquals(key.e, e);
+  assertEquals(key.n, n);
+  assertEquals(key.d, d);
+  assertEquals(key.qi, qi);
+  assertEquals(key.length, 256);
+});