Cacher is the code snippet organizer for pro developers

# View PEM encoded certificate
# Use the command that has the extension of your certificate replacing cert.xxx with the name of your certificate

openssl x509 -in cert.pem -text -noout
openssl x509 -in cert.cer -text -noout
openssl x509 -in cert.crt -text -noout

# If you get the folowing error it means that you are trying to view a DER encoded certifciate and need to use the commands in the “View DER encoded certificate  below”

# > unable to load certificate
# > 12626:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:647:Expecting: TRUSTED CERTIFICATE

# View DER encoded Certificate
openssl x509 -in certificate.der -inform der -text -noout

#If you get the following error it means that you are trying to view a PEM encoded certificate with a command meant for DER encoded certs. Use a command in the “View PEM encoded certificate above

# > unable to load certificate
# > 13978:error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag:tasn_dec.c:1306:
# > 13978:error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error:tasn_dec.c:380:Type=X509

# Transform
# Transforms can take one type of encoded certificate to another. (ie. PEM To DER conversion)

# PEM to DER
openssl x509 -in cert.crt -outform der -out cert.der

# DER to PEM
openssl x509 -in cert.crt -inform der -outform pem -out cert.pem