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- This test data was produced by creating a self-signed EC cert using OpenSSL,
- and then extracting the relevant fields.
- It uses RSA PKCS#1 v1.5 with SHA-256 and a 1024-bit key.
- (1) Generate self-signed certificate
- openssl genrsa -out rsa_key.pem 1024
- openssl req -new -key rsa_key.pem -x509 -nodes -days 365 -out cert.pem
- (2) Extract public key
- openssl x509 -in cert.pem -pubkey -noout > pubkey.pem
- cat pubkey.pem
- (3) Extract signed data (tbsCertificate)
- openssl asn1parse -in cert.pem -out tbs -noout -strparse 4
- base64 tbs
- (4) Extract signature algorithm
- # Find the offset of the signature algorithm near the end (491 in this case)
- openssl asn1parse -in cert.pem
- openssl asn1parse -in cert.pem -out alg -noout -strparse 491
- base64 alg
- (5) Extract the signature
- # Find the final offset of BIT STRING (506 in this case)
- openssl asn1parse -in cert.pem
- openssl asn1parse -in cert.pem -out sig -noout -strparse 506
- base64 sig
- $ openssl asn1parse -i < [PUBLIC KEY]
- 0:d=0 hl=3 l= 159 cons: SEQUENCE
- 3:d=1 hl=2 l= 13 cons: SEQUENCE
- 5:d=2 hl=2 l= 9 prim: OBJECT :rsaEncryption
- 16:d=2 hl=2 l= 0 prim: NULL
- 18:d=1 hl=3 l= 141 prim: BIT STRING
- -----BEGIN PUBLIC KEY-----
- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCqR+B2Mj1irNp1JnY2zQIQRQPz7ybs6mUjHT3
- hf5APyaig2u6fBPThqxssgg0YviqIj/70hVK/JXcqP1zgR5AhsA0agnwAjfB/ow4EH+3HEYV52q
- pxN98pUxC+1l2hgVtn8xCS/JGyjK+6dv+lZw3ixJoX2RjVtdJ4/cn318EhhQIDAQAB
- -----END PUBLIC KEY-----
- $ openssl asn1parse -i < [ALGORITHM]
- 0:d=0 hl=2 l= 13 cons: SEQUENCE
- 2:d=1 hl=2 l= 9 prim: OBJECT :sha256WithRSAEncryption
- 13:d=1 hl=2 l= 0 prim: NULL
- -----BEGIN ALGORITHM-----
- MA0GCSqGSIb3DQEBCwUA
- -----END ALGORITHM-----
- -----BEGIN DATA-----
- MIIB46ADAgECAgkA3l4tFOVii0UwDQYJKoZIhvcNAQELBQAwVjELMAkGA1UEBhMCQVUxEzARBgN
- VBAgMClNvbWUtU3RhdGUxITAfBgNVBAoMGEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEPMA0GA1
- UEAwwGTXkga2V5MB4XDTE1MDcwMjE3MDYzOVoXDTE2MDcwMTE3MDYzOVowVjELMAkGA1UEBhMCQ
- VUxEzARBgNVBAgMClNvbWUtU3RhdGUxITAfBgNVBAoMGEludGVybmV0IFdpZGdpdHMgUHR5IEx0
- ZDEPMA0GA1UEAwwGTXkga2V5MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCqR+B2Mj1irNp
- 1JnY2zQIQRQPz7ybs6mUjHT3hf5APyaig2u6fBPThqxssgg0YviqIj/70hVK/JXcqP1zgR5AhsA
- 0agnwAjfB/ow4EH+3HEYV52qpxN98pUxC+1l2hgVtn8xCS/JGyjK+6dv+lZw3ixJoX2RjVtdJ4/
- cn318EhhQIDAQABo1AwTjAdBgNVHQ4EFgQUzQBVKTEknyLndWd2HTsBdTKvyikwHwYDVR0jBBgw
- FoAUzQBVKTEknyLndWd2HTsBdTKvyikwDAYDVR0TBAUwAwEB/w==
- -----END DATA-----
- $ openssl asn1parse -i < [SIGNATURE]
- 0:d=0 hl=3 l= 129 prim: BIT STRING
- -----BEGIN SIGNATURE-----
- A4GBADrHSmFSJw/Gv7hs5PNzpaJwAri/sitarIZfzN/SjR+n8L8yeTEoiDb1+BkxlFvXvPHTaOK
- oO3WlslNNOxh1W5/JkYYGOUkCcyIjnln6qS560imcr3VNjomT/M8M2Iss+rJiKau1TRuaP7H8i6
- +Gqf3saGdr8/LnvFAdNQvkalQt
- -----END SIGNATURE-----
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