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Certificates

Certificates

Info:
- A Warm Welcome to ASN.1 and DER
- A Layman's Guide to a Subset of ASN.1, BER, and DER

DER Format

https://medium.com/@bn121rajesh/understanding-rsa-public-key-70d900b1033c

DER RSA Public Key:

1:30 81 9F // Type: 30 (SEQUENCE) Length: 0x9F 2:| 30 0D // Type: 30 (SEQUENCE) Length: 0x0D 3:| | 06 09 // Type: 06 (OBJECT_IDENTIFIER) Length: 0x09 4:| | - 2A 86 48 // 9 bytes OID value. HEX encoding of 5:| | - 86 F7 0D // 1.2.840.113549.1.1.1 6:| | - 01 01 01 7:| | 05 00 // Type: 05 (NULL) Length: 0x00 8:| 03 81 8D // Type: 03 (BIT STRING) Length: 0x8D 9:| | - 00 // Number of unused bits in last content byte 10:| | 30 81 89 // Type: 30 (SEQUENCE) Length: 0x89 11:| | | 02 81 81 // Type: 02 (INTEGER) Length: 0x81 12:| | | - 00 // Leading ZERO of integer 13:| | | - D1 14 D5 3E FB DD DA 12 FC F7 71 5F 0B 49 43 FD 14:| | | - 89 BD E2 53 14 FB 4A E7 DD 55 77 20 54 52 BD 33 15:| | | - 70 58 CE FA E8 03 5B 8E FE 96 AB 14 E2 40 05 39 16:| | | - 0D 85 33 CF 3F FE A6 8E B5 36 08 F1 19 27 5C C8 17:| | | - 92 96 92 34 9A EB 86 9A 7F AC D3 0E F6 7C 8B 60 18:| | | - F1 AC F4 C7 DD 06 25 94 3E 61 D6 E6 66 35 A0 3D 19:| | | - 32 7B 89 B2 D2 D1 2C 1C E9 60 1C 2F 00 84 0F 0E 20:| | | - B6 21 EB E8 86 34 6A 05 E6 1F FC B9 62 64 96 6F 21:| | | 02 03 // Type: 02 (INTEGER) Length: 0x3 22:| | | - 01 00 01 // Public Exponent. Hex for 65537

ASN.1

Online JS ASN.1 Decoder