diff --git a/.phive/phars.xml b/.phive/phars.xml
index c05fe29..3a2518b 100644
--- a/.phive/phars.xml
+++ b/.phive/phars.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phive xmlns="https://phar.io/phive">
   <phar name="php-cs-fixer" version="^3.14.4" installed="3.14.4" location="./tools/php-cs-fixer" copy="false"/>
-  <phar name="phpcs" version="^3.7.1" installed="3.7.1" location="./tools/phpcs" copy="false"/>
-  <phar name="phpcbf" version="^3.7.1" installed="3.7.1" location="./tools/phpcbf" copy="false"/>
-  <phar name="phpstan" version="^1.10.1" installed="1.10.1" location="./tools/phpstan" copy="false"/>
+  <phar name="phpcs" version="^3.7.2" installed="3.7.2" location="./tools/phpcs" copy="false"/>
+  <phar name="phpcbf" version="^3.7.2" installed="3.7.2" location="./tools/phpcbf" copy="false"/>
+  <phar name="phpstan" version="^1.10.2" installed="1.10.2" location="./tools/phpstan" copy="false"/>
   <phar name="composer-normalize" version="^2.29.0" installed="2.29.0" location="./tools/composer-normalize" copy="false"/>
 </phive>
diff --git a/README.md b/README.md
index 821b721..3892685 100644
--- a/README.md
+++ b/README.md
@@ -69,7 +69,7 @@ echo $certificado->serialNumber()->bytes(), PHP_EOL; // número de serie del cer
 ## Acerca de los archivos de certificado y llave privada
 
 Los archivos de certificado vienen en formato `X.509 DER` y los de llave privada en formato `PKCS#8 DER`.
-Ambos formatos no se pueden interpretar directamente en PHP (con `ext-openssl`), sin embargo sí lo pueden hacer
+Ambos formatos no se pueden interpretar directamente en PHP (con `ext-openssl`), sin embargo, sí lo pueden hacer
 en el formato compatible [`PEM`](https://en.wikipedia.org/wiki/Privacy-Enhanced_Mail).
 
 Esta librería tiene la capacidad de hacer esta conversión internamente (sin `openssl`), pues solo consiste en codificar
@@ -119,6 +119,48 @@ Notas de tratamiento de archivos `DER`:
 Para entender más de los formatos de llaves privadas se puede consultar la siguiente liga:
 <https://github.com/kjur/jsrsasign/wiki/Tutorial-for-PKCS5-and-PKCS8-PEM-private-key-formats-differences>
 
+## Leer y exportar archivos PFX
+
+Esta librería soporta obtener el objeto `Credential` desde un archivo PFX (PKCS #12) y vicerversa.
+
+Para exportar el archivo PFX:
+
+```php
+<?php declare(strict_types=1);
+
+use PhpCfdi\Credentials\Pfx\PfxExporter;
+
+$credential = PhpCfdi\Credentials\Credential::openFiles(
+  'certificate/certificado.cer',
+  'certificate/private-key.key',
+  'password'
+);
+
+$pfxExporter = new PfxExporter($credential);
+
+// crea el binary string usando la contraseña dada
+$pfxContents = $pfxExporter->export('pfx-passphrase');
+
+// guarda el archivo pfx a la ruta local dada usando la contraseña dada
+$pfxExporter->exportToFile('credential.pfx', 'pfx-passphrase');
+```
+
+Para leer el archivo PFX y obtener un objeto `Credential`:
+
+```php
+<?php declare(strict_types=1);
+
+use PhpCfdi\Credentials\Pfx\PfxReader;
+
+$pfxReader = new PfxReader();
+
+// crea un objeto Credential dado el contenido de un archivo pfx
+$credential = $pfxReader->createCredentialFromContents('contenido-del-archivo', 'pfx-passphrase');
+
+// crea un objeto Credential dada la ruta local de un archivo pfx
+$credential = $pfxReader->createCredentialsFromFile('pfxFilePath', 'pfx-passphrase');
+```
+
 ## Compatibilidad
 
 Esta librería se mantendrá compatible con al menos la versión con
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 811474a..dd50aa4 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -9,11 +9,20 @@ Usamos [Versionado Semántico 2.0.0](SEMVER.md) por lo que puedes usar esta libr
 Pueden aparecer cambios no liberados que se integran a la rama principal, pero no ameritan una nueva liberación de
 versión, aunque sí su incorporación en la rama principal de trabajo. Generalmente, se tratan de cambios en el desarrollo.
 
-### Mantenimiento 2023-02-22
+## Listado de cambios
+
+### Versión 1.2.0 2023-02-24
+
+Se agrega la funcionalidad para exportar (`PfxExporter`) y leer (`PfxReader`) una credencial con formato PKCS#12 (PFX).
+Gracias `@celli33` por tu contribución.
+
+Los siguientes cambios ya estaban incluidos en la rama principal:
+
+#### Mantenimiento 2023-02-22
 
 Los siguientes cambios son de mantenimiento:
 
-- Se actualiza el año en el archivo de licencia.
+- Se actualiza el año en el archivo de licencia. ¡Feliz 2023!
 - Se agrega una prueba para comprobar certificados *Teletex*.
   Ver https://github.com/nodecfdi/credentials/commit/cd8f1827e06a5917c41940e82b8d696379362d5d.
 - Se agrega un archivo de documentación: *Ejemplo de creación de una credencial con verificaciones previas*.
@@ -28,8 +37,6 @@ Los siguientes cambios son de mantenimiento:
   - Se corrige el trabajo `phpcs` eliminando las rutas fijas.
 - Se actualizan las versiones de las herramientas de desarrollo.
 
-## Listado de cambios
-
 ### Versión 1.1.4 2022-01-31
 
 - Se mejora la forma en como son procesados los tipos de datos del certificado.
diff --git a/src/Pfx/PfxExporter.php b/src/Pfx/PfxExporter.php
new file mode 100644
index 0000000..984ea2f
--- /dev/null
+++ b/src/Pfx/PfxExporter.php
@@ -0,0 +1,70 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpCfdi\Credentials\Pfx;
+
+use PhpCfdi\Credentials\Credential;
+use PhpCfdi\Credentials\Internal\LocalFileOpenTrait;
+use RuntimeException;
+
+class PfxExporter
+{
+    use LocalFileOpenTrait;
+
+    /** @var Credential $credential */
+    private $credential;
+
+    public function __construct(Credential $credential)
+    {
+        $this->credential = $credential;
+    }
+
+    public function getCredential(): Credential
+    {
+        return $this->credential;
+    }
+
+    public function export(string $passPhrase): string
+    {
+        $pfxContents = '';
+        /** @noinspection PhpUsageOfSilenceOperatorInspection */
+        $success = @openssl_pkcs12_export(
+            $this->credential->certificate()->pem(),
+            $pfxContents,
+            [$this->credential->privateKey()->pem(), $this->credential->privateKey()->passPhrase()],
+            $passPhrase,
+        );
+        if (! $success) {
+            throw $this->exceptionFromLastError(sprintf(
+                'Cannot export credential with certificate %s',
+                $this->credential->certificate()->serialNumber()->bytes()
+            ));
+        }
+        return $pfxContents;
+    }
+
+    public function exportToFile(string $pfxFile, string $passPhrase): void
+    {
+        /** @noinspection PhpUsageOfSilenceOperatorInspection */
+        $success = @openssl_pkcs12_export_to_file(
+            $this->credential->certificate()->pem(),
+            $pfxFile,
+            [$this->credential->privateKey()->pem(), $this->credential->privateKey()->passPhrase()],
+            $passPhrase
+        );
+        if (! $success) {
+            throw $this->exceptionFromLastError(sprintf(
+                'Cannot export credential with certificate %s to file %s',
+                $this->credential->certificate()->serialNumber()->bytes(),
+                $pfxFile
+            ));
+        }
+    }
+
+    private function exceptionFromLastError(string $message): RuntimeException
+    {
+        $previousError = error_get_last() ?? [];
+        return new RuntimeException(sprintf('%s: %s', $message, $previousError['message'] ?? '(Unknown reason)'));
+    }
+}
diff --git a/src/Pfx/PfxReader.php b/src/Pfx/PfxReader.php
new file mode 100644
index 0000000..afd1b1e
--- /dev/null
+++ b/src/Pfx/PfxReader.php
@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpCfdi\Credentials\Pfx;
+
+use PhpCfdi\Credentials\Credential;
+use PhpCfdi\Credentials\Internal\LocalFileOpenTrait;
+use UnexpectedValueException;
+
+class PfxReader
+{
+    use LocalFileOpenTrait;
+
+    public function createCredentialFromContents(string $contents, string $passPhrase): Credential
+    {
+        if ('' === $contents) {
+            throw new UnexpectedValueException('Cannot create credential from empty PFX contents');
+        }
+        $pfx = $this->loadPkcs12($contents, $passPhrase);
+        $certificatePem = $pfx['cert'];
+        $privateKeyPem = $pfx['pkey'];
+        return Credential::create($certificatePem, $privateKeyPem, '');
+    }
+
+    public function createCredentialFromFile(string $fileName, string $passPhrase): Credential
+    {
+        return $this->createCredentialFromContents(self::localFileOpen($fileName), $passPhrase);
+    }
+
+    /**
+     * @return array{cert:string, pkey:string}
+     */
+    public function loadPkcs12(string $contents, string $password = ''): array
+    {
+        $pfx = [];
+        if (! openssl_pkcs12_read($contents, $pfx, $password)) {
+            throw new UnexpectedValueException('Invalid PKCS#12 contents or wrong passphrase');
+        }
+        return [
+            'cert' => $pfx['cert'] ?? '',
+            'pkey' => $pfx['pkey'] ?? '',
+        ];
+    }
+}
diff --git a/tests/Unit/Pfx/PfxExporterTest.php b/tests/Unit/Pfx/PfxExporterTest.php
new file mode 100644
index 0000000..92f51a9
--- /dev/null
+++ b/tests/Unit/Pfx/PfxExporterTest.php
@@ -0,0 +1,107 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpCfdi\Credentials\Tests\Unit\Pfx;
+
+use PhpCfdi\Credentials\Certificate;
+use PhpCfdi\Credentials\Credential;
+use PhpCfdi\Credentials\Pfx\PfxExporter;
+use PhpCfdi\Credentials\Pfx\PfxReader;
+use PhpCfdi\Credentials\PrivateKey;
+use PhpCfdi\Credentials\Tests\TestCase;
+use RuntimeException;
+
+class PfxExporterTest extends TestCase
+{
+    /** @var string */
+    private $credentialPassphrase;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->credentialPassphrase = trim($this->fileContents('CSD01_AAA010101AAA/password.txt'));
+    }
+
+    private function createCredential(): Credential
+    {
+        return Credential::openFiles(
+            $this->filePath('CSD01_AAA010101AAA/certificate.cer'),
+            $this->filePath('CSD01_AAA010101AAA/private_key.key'),
+            $this->credentialPassphrase
+        );
+    }
+
+    public function testExport(): void
+    {
+        $credential = $this->createCredential();
+        $pfxExporter = new PfxExporter($credential);
+
+        $pfxContents = $pfxExporter->export('');
+
+        $reader = new PfxReader();
+        $this->assertSame(
+            $reader->loadPkcs12($this->fileContents('CSD01_AAA010101AAA/credential_unprotected.pfx')),
+            $reader->loadPkcs12($pfxContents)
+        );
+    }
+
+    public function testExportToFile(): void
+    {
+        $credential = $this->createCredential();
+        $pfxExporter = new PfxExporter($credential);
+        $temporaryFile = tempnam('', '');
+        if (false === $temporaryFile) {
+            $this->fail('Expected to create a temporary file');
+        }
+
+        $pfxExporter->exportToFile($temporaryFile, '');
+
+        $reader = new PfxReader();
+        $this->assertSame(
+            $reader->loadPkcs12($this->fileContents('CSD01_AAA010101AAA/credential_unprotected.pfx')),
+            $reader->loadPkcs12((string) file_get_contents($temporaryFile))
+        );
+    }
+
+    public function testExportWithError(): void
+    {
+        // create a credential with an invalid private key to produce error
+        $certificate = Certificate::openFile($this->filePath('CSD01_AAA010101AAA/certificate.cer'));
+        $privateKey = $this->createMock(PrivateKey::class);
+        $privateKey->method('belongsTo')->willReturn(true);
+        $privateKey->method('pem')->willReturn('bar');
+        $privateKey->method('passPhrase')->willReturn('baz');
+        $malformedCredential = new Credential($certificate, $privateKey);
+
+        $pfxExporter = new PfxExporter($malformedCredential);
+
+        $this->expectException(RuntimeException::class);
+        $this->expectExceptionMessageMatches(
+            '#^Cannot export credential with certificate 30001000000300023708: #'
+        );
+
+        $pfxExporter->export('');
+    }
+
+    public function testExportToFileWithError(): void
+    {
+        $credential = $this->createCredential();
+        $pfxExporter = new PfxExporter($credential);
+        $exportFile = __DIR__ . '/non-existent/path/file.pfx';
+
+        $this->expectException(RuntimeException::class);
+        $this->expectExceptionMessageMatches(
+            "#^Cannot export credential with certificate 30001000000300023708 to file $exportFile: #"
+        );
+        $pfxExporter->exportToFile($exportFile, '');
+    }
+
+    public function testGetCredential(): void
+    {
+        $credential = $this->createCredential();
+        $pfxExporter = new PfxExporter($credential);
+
+        $this->assertSame($credential, $pfxExporter->getCredential());
+    }
+}
diff --git a/tests/Unit/Pfx/PfxReaderTest.php b/tests/Unit/Pfx/PfxReaderTest.php
new file mode 100644
index 0000000..a538f46
--- /dev/null
+++ b/tests/Unit/Pfx/PfxReaderTest.php
@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpCfdi\Credentials\Tests\Unit\Pfx;
+
+use PhpCfdi\Credentials\Credential;
+use PhpCfdi\Credentials\Pfx\PfxReader;
+use PhpCfdi\Credentials\Tests\TestCase;
+use UnexpectedValueException;
+
+class PfxReaderTest extends TestCase
+{
+    private function obtainKnownCredential(): Credential
+    {
+        $reader = new PfxReader();
+        return $reader->createCredentialFromFile(
+            $this->filePath('CSD01_AAA010101AAA/credential_unprotected.pfx'),
+            ''
+        );
+    }
+
+    /**
+     * @testWith ["CSD01_AAA010101AAA/credential_unprotected.pfx", ""]
+     *           ["CSD01_AAA010101AAA/credential_protected.pfx", "CSD01_AAA010101AAA/password.txt"]
+     */
+    public function testCreateCredentialFromFile(string $dir, string $passPhrasePath): void
+    {
+        $passPhrase = $this->fileContents($passPhrasePath);
+        $reader = new PfxReader();
+        $expectedCsd = $this->obtainKnownCredential();
+
+        $csd = $reader->createCredentialFromFile($this->filePath($dir), $passPhrase);
+
+        $this->assertInstanceOf(Credential::class, $csd);
+        $this->assertSame($expectedCsd->certificate()->pem(), $csd->certificate()->pem());
+        $this->assertSame($expectedCsd->privateKey()->pem(), $csd->privateKey()->pem());
+    }
+
+    public function testCreateCredentialEmptyContents(): void
+    {
+        $reader = new PfxReader();
+
+        $this->expectException(UnexpectedValueException::class);
+        $this->expectExceptionMessage('Cannot create credential from empty PFX contents');
+
+        $reader->createCredentialFromContents('', '');
+    }
+
+    public function testCreateCredentialWrongContent(): void
+    {
+        $reader = new PfxReader();
+
+        $this->expectException(UnexpectedValueException::class);
+        $this->expectExceptionMessage('Invalid PKCS#12 contents or wrong passphrase');
+
+        $reader->createCredentialFromContents('invalid-contents', '');
+    }
+
+    public function testCreateCredentialWrongPassword(): void
+    {
+        $reader = new PfxReader();
+
+        $this->expectException(UnexpectedValueException::class);
+        $this->expectExceptionMessage('Invalid PKCS#12 contents or wrong passphrase');
+
+        $reader->createCredentialFromFile(
+            $this->filePath('CSD01_AAA010101AAA/credential_protected.pfx'),
+            'wrong-password'
+        );
+    }
+}
diff --git a/tests/_files/CSD01_AAA010101AAA/credential_protected.pfx b/tests/_files/CSD01_AAA010101AAA/credential_protected.pfx
new file mode 100644
index 0000000..41f2b58
Binary files /dev/null and b/tests/_files/CSD01_AAA010101AAA/credential_protected.pfx differ
diff --git a/tests/_files/CSD01_AAA010101AAA/credential_unprotected.pfx b/tests/_files/CSD01_AAA010101AAA/credential_unprotected.pfx
new file mode 100644
index 0000000..43cf2a6
Binary files /dev/null and b/tests/_files/CSD01_AAA010101AAA/credential_unprotected.pfx differ
diff --git a/tests/_files/README.md b/tests/_files/README.md
index 41322d0..5cd3cb9 100644
--- a/tests/_files/README.md
+++ b/tests/_files/README.md
@@ -33,11 +33,6 @@ openssl base64 -in data-sha256.bin -out data-sha256.txt
 openssl dgst -sha256 -verify CSD01_AAA010101AAA.cer.pem -signature data-sha256.bin data-to-sign.txt
 ```
 
-
-
-
-
-
 Estos archivos fueron descargados desde
 <http://omawww.sat.gob.mx/informacion_fiscal/factura_electronica/Paginas/certificado_sello_digital.aspx>
 
@@ -55,3 +50,14 @@ Para protegerla con password nuevamente se usó:
 ```
 openssl rsa -in aaa010101aaa_FIEL.key.pem -des3 -out aaa010101aaa_FIEL_password.key.pem
 ```
+
+Para generar los archivos PFX se usó:
+
+```shell
+# credential_protected.pfx
+openssl pkcs12 -export -in certificate.cer -inkey private_key.key.pem -passin pass:12345678a -out credential_protected.pfx --passout pass:12345678a
+# credential_unprotected.pfx
+openssl pkcs12 -export -in certificate.cer -inkey private_key.key.pem -passin pass:12345678a -out credential_unprotected.pfx --passout pass:
+# ver el contenido de un archivo pfx
+openssl pkcs12 -info -in credential_unprotected.pfx -passin pass: -noenc
+```