Begin Private Key
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Hi I was writing a program that imports private keys from a .pem file and create a private key object to use it later.. the problem I have faced is that some pem files header begin with
through my search I knew that the first ones are PKCS#8 formatted but I couldn't know what format does the other one belongs to.
monim
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BEGIN RSA PRIVATE KEY is PKCS#1 and is just an RSA key. It is essentially just the key object from PKCS#8, but without the version or algorithm identifier in front. BEGIN PRIVATE KEY is PKCS#8 and indicates that the key type is included in the key data itself. From the link:
The unencrypted PKCS#8 encoded data starts and ends with the tags:
Within the base64 encoded data the following DER structure is present:
So for an RSA private key, the OID is 1.2.840.113549.1.1.1 and there is a RSAPrivateKey as the PrivateKey key data bitstring.
As opposed to BEGIN RSA PRIVATE KEY, which always specifies an RSA key and therefore doesn't include a key type OID. BEGIN RSA PRIVATE KEY is PKCS#1:
The RSA private key PEM file is specific for RSA keys.
Within the base64 encoded data the following DER structure is present:
Jason C
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so, is there any format that is used except those two, and if there is how can I determine it from the header? – monim Nov 19 '13 at 8:40
I'd imagine any of the private key tags given in sonic's answer are fair game. – Jason C Nov 19 '13 at 8:49
For RSA keys, PKCS#1 contains CRT parameters, PKCS#8 doesn't. You can confirm this by looking at sizes. PKCS#8 is smaller even with more headers added. If you care about performance, use PKCS#1. My test shows 3 times faster. – ZZ Coder Dec 5 '14 at 18:08
@ZZCoder, could you please provide some details on how you generated the keys and tested the performance? openssl genpkey -algorithm RSA -out key.pem generates the PKCS#8 key that does include the CRT parameters. – Vadim Kuznetsov May 1 '15 at 10:30
To generate a PKCS#1 key the openssl genrsa command can be used. Using openssl req to generate both the private key and the crt will end up with a PKCS#8 key. The genpkey manual states The use of the genpkey program is encouraged over the algorithm specific utilities because additional algorithm options and ENGINE provided algorithms can be used.. But some software (mysql) can use only PKCS#1 keys. Converting from PKCS#8 to PKCS#1 can be done with openssl rsa -in key.pem -out key.pem. Converting the other way can be done with openssl pkey -in key.pem -out key.pem. – Paul Tobias Sep 7 '18 at 4:28
Have a look at . It gives possible BEGIN markers.
Copying the content from the above link for quick reference:
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Differences between "BEGIN RSA PRIVATE KEY" and "BEGIN PRIVATE KEY"
Hi I was writing a program that imports private keys from a .pem file and create a private key object to use it later.. the problem I have faced is that some pem files header begin with
through my search I knew that the first ones are PKCS#8 formatted but I couldn't know what format does the other one belongs to.
Привет, я писал программу, которая импортирует секретные ключи из файла .pem и создает объект закрытого ключа, чтобы использовать его позже. проблема, с которой я столкнулся, - это что некоторые pem файлов заголовки начинаются с
через мой поиск я знал, что первые из них является PKCS#8 отформатирован, но я не мог знать, какой формат делает другой принадлежит.
Создан 19 ноя. 132013-11-19 07:08:02 monim
BEGIN RSA PRIVATE KEY is PKCS#1 and is just an RSA key. It is essentially just the key object from PKCS#8, but without the version or algorithm identifier in front. BEGIN PRIVATE KEY is PKCS#8 and indicates that the key type is included in the key data itself. From the link:
The unencrypted PKCS#8 encoded data starts and ends with the tags:
Within the base64 encoded data the following DER structure is present:
So for an RSA private key, the OID is 1.2.840.113549.1.1.1 and there is a RSAPrivateKey as the PrivateKey key data bitstring.
As opposed to BEGIN RSA PRIVATE KEY, which always specifies an RSA key and therefore doesn't include a key type OID. BEGIN RSA PRIVATE KEY is PKCS#1:
The RSA private key PEM file is specific for RSA keys.
Within the base64 encoded data the following DER structure is present:
Создан 19 ноя. 132013-11-19 07:23:20 Jason C
so, is there any format that is used except those two, and if there is how can I determine it from the header? – monim 19 ноя. 132013-11-19 08:40:26
I'd imagine any of the private key tags given in sonic's answer are fair game. – Jason C 19 ноя. 132013-11-19 08:49:03
For RSA keys, PKCS#1 contains CRT parameters, PKCS#8 doesn't. You can confirm this by looking at sizes. PKCS#8 is smaller even with more headers added. If you care about performance, use PKCS#1. My test shows 3 times faster. – ZZ Coder 05 дек. 142014-12-05 18:08:07
@ZZCoder, could you please provide some details on how you generated the keys and tested the performance? 'openssl genpkey -algorithm RSA -out key.pem' generates the PKCS#8 key that does include the CRT parameters. – Vadim Kuznetsov 01 май. 152015-05-01 10:30:48
Have a look at this. It gives possible BEGIN markers.
Copying the content from the above link for quick reference:
Создан 19 ноя. 132013-11-19 07:25:18 vishnu viswanath
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Begin Private Key
