Parsing of PKCS#8 encrypted private key files added and PKCS#12 basis

PKCS#8 encrypted key file support has been added to x509parse_key() with
support for some PCKS#12 PBE functions (pbeWithSHAAnd128BitRC4,
pbeWithSHAAnd3-KeyTripleDES-CBC and pbeWithSHAAnd2-KeyTripleDES-CBC)
(cherry picked from commit cf6e95d9a81c7b22271beb58a09b5c756148e62a)

Conflicts:
	scripts/generate_errors.pl

tests/data_files/pkcs8_pbe_sha1_2des.key

@@ -0,0 +1,29 @@
+-----BEGIN ENCRYPTED PRIVATE KEY-----
+MIIE6jAcBgoqhkiG9w0BDAEEMA4ECJUO+jJnTjpKAgIIAASCBMi9QFFLgKGYOSDR
+0zyRMc87RkrvSlyRi8BibyKvTNEDq77jTr6ZEuOF1OeZ9fvdZwJeI4GkTeKkWqTw
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+1m0wWUVGSm5CO8Rfon8=
+-----END ENCRYPTED PRIVATE KEY-----

tests/data_files/pkcs8_pbe_sha1_3des.key

@@ -0,0 +1,29 @@
+-----BEGIN ENCRYPTED PRIVATE KEY-----
+MIIE6jAcBgoqhkiG9w0BDAEDMA4ECGhNuQogiktrAgIIAASCBMhfcb+Jt0YOgGni
+IWnwmmtYT6Nvina/j3FCGzcHCDyUQDqh1rPUtZnmUdM3fyEGlUJdX9wmHh3gUkWx
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+Z4/b5SMVucBKq9sUm6g=
+-----END ENCRYPTED PRIVATE KEY-----

tests/data_files/pkcs8_pbe_sha1_rc4_128.key

@@ -0,0 +1,29 @@
+-----BEGIN ENCRYPTED PRIVATE KEY-----
+MIIE4zAcBgoqhkiG9w0BDAEBMA4ECCLhzdwnOXIZAgIIAASCBMG8Wgfn++CFRl37
+FdQZ90pI+u37yj8v0kFd3rDaDMurEftf10gWwTbm8R8J0eK1edIAHQabkgsF83gD
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+kjRXU176HQ==
+-----END ENCRYPTED PRIVATE KEY-----

tests/suites/test_suite_x509parse.data

@@ -114,6 +114,22 @@ X509 Parse Key #9 (PKCS#8 wrapped)
 depends_on:POLARSSL_MD5_C:POLARSSL_PEM_C:POLARSSL_FS_IO
 x509parse_keyfile:"data_files/format_gen.key":"":0
 
+X509 Parse Key #10 (PKCS#8 encrypted SHA1-3DES)
+depends_on:POLARSSL_DES_C:POLARSSL_SHA1_C:POLARSSL_PEM_C:POLARSSL_FS_IO
+x509parse_keyfile:"data_files/pkcs8_pbe_sha1_3des.key":"PolarSSLTest":0
+
+X509 Parse Key #11 (PKCS#8 encrypted SHA1-3DES DER)
+depends_on:POLARSSL_DES_C:POLARSSL_SHA1_C:POLARSSL_FS_IO
+x509parse_keyfile:"data_files/pkcs8_pbe_sha1_3des.der":"PolarSSLTest":0
+
+X509 Parse Key #12 (PKCS#8 encrypted SHA1-2DES)
+depends_on:POLARSSL_DES_C:POLARSSL_SHA1_C:POLARSSL_PEM_C:POLARSSL_FS_IO
+x509parse_keyfile:"data_files/pkcs8_pbe_sha1_2des.key":"PolarSSLTest":0
+
+X509 Parse Key #13 (PKCS#8 encrypted SHA1-RC4-128)
+depends_on:POLARSSL_ARC4_C:POLARSSL_SHA1_C:POLARSSL_PEM_C:POLARSSL_FS_IO
+x509parse_keyfile:"data_files/pkcs8_pbe_sha1_rc4_128.key":"PolarSSLTest":0
+
 X509 Parse Public Key #1 (PKCS#8 wrapped)
 depends_on:POLARSSL_MD5_C:POLARSSL_PEM_C:POLARSSL_FS_IO
 x509parse_public_keyfile:"data_files/format_gen.pub":0