The key, message, and signature come from Example 1 of:
ftp://ftp.rsa.com/pub/rsalabs/tmp/pkcs1v15sign-vectors.txt

(The algorithm DER was synthesized to match, and the signature enclosed in a BIT STRING).

It uses an RSA key with modulus length of 1024 bits, PKCS#1 v1.5 padding, and
SHA-1 as the digest.


$ 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-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQClbkoOcBAXWJpRh9x+qEHRVvLsDjatUqRN/rH
mH3rZkdjFEFb/7bFitMDyg6EqiKOU3/Umq3KRy7MHzqv84LHf1c2VCAltWyuLbfXWce9jd8CSHL
I8Jwpw4lmOb/idGfEFrMLT8Ms18pKA4Thrb2TE7yLh4fINDOjP+yJJvZohNwIDAQAB
-----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            :sha1WithRSAEncryption
   13:d=1  hl=2 l=   0 prim:  NULL              
-----BEGIN ALGORITHM-----
MA0GCSqGSIb3DQEBBQUA
-----END ALGORITHM-----

-----BEGIN DATA-----
zch9oiPXht87ReC7vHITJtHuKvgGzDFUdcxvDZxm4bYjcdRc4jkuGskoRMMQEC8Vag2NUsH0xAu
jqmUJV4bLdpdXplY7qVj+0LzJhOi1F6PV9RWyO4pB50qoZ2k/kN+wYabobfqu5kRywA5fIJRXKc
vr538Gznjgj0CY+6QfnWGTwDF+i2DUtghKy0LSnjgIo7w3LYXjMRcPy/fMctC3HClmSLOk0Q9BY
pXQgHqmJcqydE/Z6o/SI8QlNwKYKL0WvgJUbxMP0uM7k20mduCK7RtzMYt1CgFn0A==
-----END DATA-----

$ openssl asn1parse -i < [SIGNATURE]
    0:d=0  hl=3 l= 129 prim: BIT STRING        
-----BEGIN SIGNATURE-----
A4GBAGvDoGZWhCkwokfjDVhktNgZI2unxollhirX28TiSvKOhrtTHwM1i+X7dHd8YIb4UMrviT8
Nb8wtDJHsATaTtOoAuAzUmqxOy1+JEa/lOa2kqPOCPR0T5HLRSQVHxlnHYX89JAh9228rcglhZ/
wJfKsY6aRY/LY0zc6O41iUxITX
-----END SIGNATURE-----