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Add RSASSA-PSS with SHA support #55

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Add RSASSA-PSS with SHA support #55

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f3e7ce8
Add RSAPSS with SHAXYZ support
Tommaso-Sgroi Oct 15, 2025
571d488
Apply suggestion from @hslatman
Tommaso-Sgroi Mar 19, 2026
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2 changes: 2 additions & 0 deletions pkcs7.go
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Original file line number Diff line number Diff line change
Expand Up @@ -81,6 +81,8 @@ var (
OIDEncryptionAlgorithmRSASHA512 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 13} // ditto
OIDEncryptionAlgorithmRSASHA224 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 14} // ditto

OIDEncryptionAlgorithmRSAPSS = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 10} // see https://www.rfc-editor.org/rfc/rfc3447.html and https://datatracker.ietf.org/doc/html/rfc8017
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OIDEncryptionAlgorithmECDSAP256 = asn1.ObjectIdentifier{1, 2, 840, 10045, 3, 1, 7}
OIDEncryptionAlgorithmECDSAP384 = asn1.ObjectIdentifier{1, 3, 132, 0, 34}
OIDEncryptionAlgorithmECDSAP521 = asn1.ObjectIdentifier{1, 3, 132, 0, 35}
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12 changes: 12 additions & 0 deletions verify.go
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Expand Up @@ -316,6 +316,18 @@ func getSignatureAlgorithm(digestEncryption, digest pkix.AlgorithmIdentifier) (x
return -1, fmt.Errorf("pkcs7: unsupported digest %q for encryption algorithm %q",
digest.Algorithm.String(), digestEncryption.Algorithm.String())
}
case digestEncryption.Algorithm.Equal(OIDEncryptionAlgorithmRSAPSS):
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switch {
case digest.Algorithm.Equal(OIDDigestAlgorithmSHA512):
return x509.SHA512WithRSAPSS, nil
case digest.Algorithm.Equal(OIDDigestAlgorithmSHA384):
return x509.SHA384WithRSAPSS, nil
case digest.Algorithm.Equal(OIDDigestAlgorithmSHA256):
return x509.SHA256WithRSAPSS, nil
default:
return -1, fmt.Errorf("pkcs7: unsupported digest %q for encryption algorithm %q",
digest.Algorithm.String(), digestEncryption.Algorithm.String())
}
case digestEncryption.Algorithm.Equal(OIDDigestAlgorithmDSA),
digestEncryption.Algorithm.Equal(OIDDigestAlgorithmDSASHA1):
switch {
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