Verify a Signature with the Flow CLI

Updated: 2021/10/22 bysideninja

2 min read

How to verify a signature from the command line

Verify validity of a signature based on provided message and public key of the signature creator.

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flow signatures verify <message> <signature> <public key>

Example Usage

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> flow signatures verify 
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  'The quick brown fox jumps over the lazy dog' 
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  b1c9eff5d829fdeaf2dad6308fc8033e3b8875bc185ef804ce5d0d980545ef5be0f98b47afc979d12272d257ce13c4b490e431bfcada485cb1d2e3f209be8d07 
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  0xc92a7c72a78f8f046a79f8a5fe1ef72424258a55eb869f13e6133301d64ad025d3362d5df9e7c82289637af1431042c4025d241fd430242368ce662d39636987
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Valid 			 true
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Message 		 The quick brown fox jumps over the lazy dog
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Signature 		 b1c9eff5d829fdeaf2...7ce13c4b490eada485cb1d2e3f209be8d07
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Public Key 		 c92a7c72a78...1431042c4025d241fd430242368ce662d39636987
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Hash Algorithm 		 SHA3_256
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Signature Algorithm 	 ECDSA_P256

Arguments

Message

• Name: message

Message data used for creating the signature.

Signature

• Name: signature

Message signature that will be verified.

Public Key

• Name: public key

Public key of the private key used for creating the signature.

Flags

Public Key Signature Algorithm

• Flag: --sig-algo
• Valid inputs: "ECDSA_P256", "ECDSA_secp256k1"

Specify the ECDSA signature algorithm of the key pair used for signing.

Flow supports the secp256k1 and P-256 curves.

Public Key Hash Algorithm

• Flag: --hash-algo
• Valid inputs: "SHA2_256", "SHA3_256"
• Default: "SHA3_256"

Specify the hash algorithm of the key pair used for signing.

Filter

• Flag: --filter
• Short Flag: -x
• Valid inputs: case-sensitive name of the result property.

Specify any property name from the result you want to return as the only value.

Output

• Flag: --output
• Short Flag: -o
• Valid inputs: json, inline

Specify in which format you want to display the result.

Save

• Flag: --save
• Short Flag: -s
• Valid inputs: valid filename

Specify the filename where you want the result to be saved.

Log

• Flag: --log
• Short Flag: -l
• Valid inputs: none, error, debug
• Default: info

Specify the log level. Control how much output you want to see while command execution.